Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/page_alloc.c |
| 3 | * |
| 4 | * Manages the free list, the system allocates free pages here. |
| 5 | * Note that kmalloc() lives in slab.c |
| 6 | * |
| 7 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 8 | * Swap reorganised 29.12.95, Stephen Tweedie |
| 9 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
| 10 | * Reshaped it to be a zoned allocator, Ingo Molnar, Red Hat, 1999 |
| 11 | * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999 |
| 12 | * Zone balancing, Kanoj Sarcar, SGI, Jan 2000 |
| 13 | * Per cpu hot/cold page lists, bulk allocation, Martin J. Bligh, Sept 2002 |
| 14 | * (lots of bits borrowed from Ingo Molnar & Andrew Morton) |
| 15 | */ |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/stddef.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/swap.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/pagemap.h> |
KOSAKI Motohiro | 10ed273 | 2008-03-04 14:28:32 -0800 | [diff] [blame] | 22 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/bootmem.h> |
Yinghai Lu | edbe7d2 | 2010-08-25 13:39:16 -0700 | [diff] [blame] | 24 | #include <linux/memblock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/compiler.h> |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 26 | #include <linux/kernel.h> |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 27 | #include <linux/kmemcheck.h> |
Andrey Ryabinin | b8c73fc | 2015-02-13 14:39:28 -0800 | [diff] [blame] | 28 | #include <linux/kasan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/module.h> |
| 30 | #include <linux/suspend.h> |
| 31 | #include <linux/pagevec.h> |
| 32 | #include <linux/blkdev.h> |
| 33 | #include <linux/slab.h> |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 34 | #include <linux/ratelimit.h> |
David Rientjes | 5a3135c2 | 2007-10-16 23:25:53 -0700 | [diff] [blame] | 35 | #include <linux/oom.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/notifier.h> |
| 37 | #include <linux/topology.h> |
| 38 | #include <linux/sysctl.h> |
| 39 | #include <linux/cpu.h> |
| 40 | #include <linux/cpuset.h> |
Dave Hansen | bdc8cb9 | 2005-10-29 18:16:53 -0700 | [diff] [blame] | 41 | #include <linux/memory_hotplug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/nodemask.h> |
| 43 | #include <linux/vmalloc.h> |
KOSAKI Motohiro | a6cccdc | 2011-05-24 17:11:33 -0700 | [diff] [blame] | 44 | #include <linux/vmstat.h> |
Christoph Lameter | 4be38e3 | 2006-01-06 00:11:17 -0800 | [diff] [blame] | 45 | #include <linux/mempolicy.h> |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 46 | #include <linux/stop_machine.h> |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 47 | #include <linux/sort.h> |
| 48 | #include <linux/pfn.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 49 | #include <linux/backing-dev.h> |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 50 | #include <linux/fault-inject.h> |
KAMEZAWA Hiroyuki | a5d76b5 | 2007-10-16 01:26:11 -0700 | [diff] [blame] | 51 | #include <linux/page-isolation.h> |
Joonsoo Kim | eefa864 | 2014-12-12 16:55:46 -0800 | [diff] [blame] | 52 | #include <linux/page_ext.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 53 | #include <linux/debugobjects.h> |
Catalin Marinas | dbb1f81 | 2009-06-11 13:23:19 +0100 | [diff] [blame] | 54 | #include <linux/kmemleak.h> |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 55 | #include <linux/compaction.h> |
Mel Gorman | 0d3d062 | 2009-09-21 17:02:44 -0700 | [diff] [blame] | 56 | #include <trace/events/kmem.h> |
Linus Torvalds | 268bb0c | 2011-05-20 12:50:29 -0700 | [diff] [blame] | 57 | #include <linux/prefetch.h> |
Lisa Du | 6e543d5 | 2013-09-11 14:22:36 -0700 | [diff] [blame] | 58 | #include <linux/mm_inline.h> |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 59 | #include <linux/migrate.h> |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 60 | #include <linux/page_ext.h> |
David Rientjes | 949f7ec | 2013-04-29 15:07:48 -0700 | [diff] [blame] | 61 | #include <linux/hugetlb.h> |
Clark Williams | 8bd75c7 | 2013-02-07 09:47:07 -0600 | [diff] [blame] | 62 | #include <linux/sched/rt.h> |
Joonsoo Kim | 48c96a3 | 2014-12-12 16:56:01 -0800 | [diff] [blame] | 63 | #include <linux/page_owner.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 65 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <asm/tlbflush.h> |
Andrew Morton | ac924c6 | 2006-05-15 09:43:59 -0700 | [diff] [blame] | 67 | #include <asm/div64.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #include "internal.h" |
| 69 | |
Cody P Schafer | c8e251f | 2013-07-03 15:01:29 -0700 | [diff] [blame] | 70 | /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ |
| 71 | static DEFINE_MUTEX(pcp_batch_high_lock); |
David Rientjes | 7cd2b0a | 2014-06-23 13:22:04 -0700 | [diff] [blame] | 72 | #define MIN_PERCPU_PAGELIST_FRACTION (8) |
Cody P Schafer | c8e251f | 2013-07-03 15:01:29 -0700 | [diff] [blame] | 73 | |
Lee Schermerhorn | 7281201 | 2010-05-26 14:44:56 -0700 | [diff] [blame] | 74 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
| 75 | DEFINE_PER_CPU(int, numa_node); |
| 76 | EXPORT_PER_CPU_SYMBOL(numa_node); |
| 77 | #endif |
| 78 | |
Lee Schermerhorn | 7aac789 | 2010-05-26 14:45:00 -0700 | [diff] [blame] | 79 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
| 80 | /* |
| 81 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. |
| 82 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. |
| 83 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem() |
| 84 | * defined in <linux/topology.h>. |
| 85 | */ |
| 86 | DEFINE_PER_CPU(int, _numa_mem_); /* Kernel "local memory" node */ |
| 87 | EXPORT_PER_CPU_SYMBOL(_numa_mem_); |
Joonsoo Kim | ad2c814 | 2014-10-09 15:26:13 -0700 | [diff] [blame] | 88 | int _node_numa_mem_[MAX_NUMNODES]; |
Lee Schermerhorn | 7aac789 | 2010-05-26 14:45:00 -0700 | [diff] [blame] | 89 | #endif |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | /* |
Christoph Lameter | 1380891 | 2007-10-16 01:25:27 -0700 | [diff] [blame] | 92 | * Array of node states. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | */ |
Christoph Lameter | 1380891 | 2007-10-16 01:25:27 -0700 | [diff] [blame] | 94 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
| 95 | [N_POSSIBLE] = NODE_MASK_ALL, |
| 96 | [N_ONLINE] = { { [0] = 1UL } }, |
| 97 | #ifndef CONFIG_NUMA |
| 98 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, |
| 99 | #ifdef CONFIG_HIGHMEM |
| 100 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, |
| 101 | #endif |
Lai Jiangshan | 20b2f52 | 2012-12-12 13:52:00 -0800 | [diff] [blame] | 102 | #ifdef CONFIG_MOVABLE_NODE |
| 103 | [N_MEMORY] = { { [0] = 1UL } }, |
| 104 | #endif |
Christoph Lameter | 1380891 | 2007-10-16 01:25:27 -0700 | [diff] [blame] | 105 | [N_CPU] = { { [0] = 1UL } }, |
| 106 | #endif /* NUMA */ |
| 107 | }; |
| 108 | EXPORT_SYMBOL(node_states); |
| 109 | |
Jiang Liu | c3d5f5f | 2013-07-03 15:03:14 -0700 | [diff] [blame] | 110 | /* Protect totalram_pages and zone->managed_pages */ |
| 111 | static DEFINE_SPINLOCK(managed_page_count_lock); |
| 112 | |
Ravikiran G Thirumalai | 6c231b7 | 2005-09-06 15:17:45 -0700 | [diff] [blame] | 113 | unsigned long totalram_pages __read_mostly; |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 114 | unsigned long totalreserve_pages __read_mostly; |
Pintu Kumar | e48322a | 2014-12-18 16:17:15 -0800 | [diff] [blame] | 115 | unsigned long totalcma_pages __read_mostly; |
Johannes Weiner | ab8fabd | 2012-01-10 15:07:42 -0800 | [diff] [blame] | 116 | /* |
| 117 | * When calculating the number of globally allowed dirty pages, there |
| 118 | * is a certain number of per-zone reserves that should not be |
| 119 | * considered dirtyable memory. This is the sum of those reserves |
| 120 | * over all existing zones that contribute dirtyable memory. |
| 121 | */ |
| 122 | unsigned long dirty_balance_reserve __read_mostly; |
| 123 | |
Hugh Dickins | 1b76b02 | 2012-05-11 01:00:07 -0700 | [diff] [blame] | 124 | int percpu_pagelist_fraction; |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 125 | gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 127 | #ifdef CONFIG_PM_SLEEP |
| 128 | /* |
| 129 | * The following functions are used by the suspend/hibernate code to temporarily |
| 130 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations |
| 131 | * while devices are suspended. To avoid races with the suspend/hibernate code, |
| 132 | * they should always be called with pm_mutex held (gfp_allowed_mask also should |
| 133 | * only be modified with pm_mutex held, unless the suspend/hibernate code is |
| 134 | * guaranteed not to run in parallel with that modification). |
| 135 | */ |
Rafael J. Wysocki | c9e664f | 2010-12-03 22:57:45 +0100 | [diff] [blame] | 136 | |
| 137 | static gfp_t saved_gfp_mask; |
| 138 | |
| 139 | void pm_restore_gfp_mask(void) |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 140 | { |
| 141 | WARN_ON(!mutex_is_locked(&pm_mutex)); |
Rafael J. Wysocki | c9e664f | 2010-12-03 22:57:45 +0100 | [diff] [blame] | 142 | if (saved_gfp_mask) { |
| 143 | gfp_allowed_mask = saved_gfp_mask; |
| 144 | saved_gfp_mask = 0; |
| 145 | } |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 146 | } |
| 147 | |
Rafael J. Wysocki | c9e664f | 2010-12-03 22:57:45 +0100 | [diff] [blame] | 148 | void pm_restrict_gfp_mask(void) |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 149 | { |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 150 | WARN_ON(!mutex_is_locked(&pm_mutex)); |
Rafael J. Wysocki | c9e664f | 2010-12-03 22:57:45 +0100 | [diff] [blame] | 151 | WARN_ON(saved_gfp_mask); |
| 152 | saved_gfp_mask = gfp_allowed_mask; |
| 153 | gfp_allowed_mask &= ~GFP_IOFS; |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 154 | } |
Mel Gorman | f90ac39 | 2012-01-10 15:07:15 -0800 | [diff] [blame] | 155 | |
| 156 | bool pm_suspended_storage(void) |
| 157 | { |
| 158 | if ((gfp_allowed_mask & GFP_IOFS) == GFP_IOFS) |
| 159 | return false; |
| 160 | return true; |
| 161 | } |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 162 | #endif /* CONFIG_PM_SLEEP */ |
| 163 | |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 164 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
| 165 | int pageblock_order __read_mostly; |
| 166 | #endif |
| 167 | |
Hugh Dickins | d98c7a0 | 2006-02-14 13:52:59 -0800 | [diff] [blame] | 168 | static void __free_pages_ok(struct page *page, unsigned int order); |
David Howells | a226f6c | 2006-01-06 00:11:08 -0800 | [diff] [blame] | 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | /* |
| 171 | * results with 256, 32 in the lowmem_reserve sysctl: |
| 172 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) |
| 173 | * 1G machine -> (16M dma, 784M normal, 224M high) |
| 174 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA |
| 175 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL |
Yaowei Bai | 84109e1 | 2015-02-12 15:00:22 -0800 | [diff] [blame] | 176 | * HIGHMEM allocation will leave (224M+784M)/256 of ram reserved in ZONE_DMA |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 177 | * |
| 178 | * TBD: should special case ZONE_DMA32 machines here - in those we normally |
| 179 | * don't need any ZONE_NORMAL reservation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | */ |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 181 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 182 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 183 | 256, |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 184 | #endif |
Christoph Lameter | fb0e794 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 185 | #ifdef CONFIG_ZONE_DMA32 |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 186 | 256, |
Christoph Lameter | fb0e794 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 187 | #endif |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 188 | #ifdef CONFIG_HIGHMEM |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 189 | 32, |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 190 | #endif |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 191 | 32, |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 192 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | EXPORT_SYMBOL(totalram_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 196 | static char * const zone_names[MAX_NR_ZONES] = { |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 197 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 198 | "DMA", |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 199 | #endif |
Christoph Lameter | fb0e794 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 200 | #ifdef CONFIG_ZONE_DMA32 |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 201 | "DMA32", |
Christoph Lameter | fb0e794 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 202 | #endif |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 203 | "Normal", |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 204 | #ifdef CONFIG_HIGHMEM |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 205 | "HighMem", |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 206 | #endif |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 207 | "Movable", |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 208 | }; |
| 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | int min_free_kbytes = 1024; |
Han Pingtian | 42aa83c | 2014-01-23 15:53:28 -0800 | [diff] [blame] | 211 | int user_min_free_kbytes = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Jan Beulich | 2c85f51 | 2009-09-21 17:03:07 -0700 | [diff] [blame] | 213 | static unsigned long __meminitdata nr_kernel_pages; |
| 214 | static unsigned long __meminitdata nr_all_pages; |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 215 | static unsigned long __meminitdata dma_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 217 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
| 218 | static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES]; |
| 219 | static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; |
| 220 | static unsigned long __initdata required_kernelcore; |
| 221 | static unsigned long __initdata required_movablecore; |
| 222 | static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 223 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 224 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ |
| 225 | int movable_zone; |
| 226 | EXPORT_SYMBOL(movable_zone); |
| 227 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 228 | |
Miklos Szeredi | 418508c | 2007-05-23 13:57:55 -0700 | [diff] [blame] | 229 | #if MAX_NUMNODES > 1 |
| 230 | int nr_node_ids __read_mostly = MAX_NUMNODES; |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 231 | int nr_online_nodes __read_mostly = 1; |
Miklos Szeredi | 418508c | 2007-05-23 13:57:55 -0700 | [diff] [blame] | 232 | EXPORT_SYMBOL(nr_node_ids); |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 233 | EXPORT_SYMBOL(nr_online_nodes); |
Miklos Szeredi | 418508c | 2007-05-23 13:57:55 -0700 | [diff] [blame] | 234 | #endif |
| 235 | |
Mel Gorman | 9ef9acb | 2007-10-16 01:25:54 -0700 | [diff] [blame] | 236 | int page_group_by_mobility_disabled __read_mostly; |
| 237 | |
Minchan Kim | ee6f509 | 2012-07-31 16:43:50 -0700 | [diff] [blame] | 238 | void set_pageblock_migratetype(struct page *page, int migratetype) |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 239 | { |
KOSAKI Motohiro | 5d0f3f7 | 2013-11-12 15:08:18 -0800 | [diff] [blame] | 240 | if (unlikely(page_group_by_mobility_disabled && |
| 241 | migratetype < MIGRATE_PCPTYPES)) |
Mel Gorman | 49255c6 | 2009-06-16 15:31:58 -0700 | [diff] [blame] | 242 | migratetype = MIGRATE_UNMOVABLE; |
| 243 | |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 244 | set_pageblock_flags_group(page, (unsigned long)migratetype, |
| 245 | PB_migrate, PB_migrate_end); |
| 246 | } |
| 247 | |
Nick Piggin | 13e7444 | 2006-01-06 00:10:58 -0800 | [diff] [blame] | 248 | #ifdef CONFIG_DEBUG_VM |
Dave Hansen | c6a57e1 | 2005-10-29 18:16:52 -0700 | [diff] [blame] | 249 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | { |
Dave Hansen | bdc8cb9 | 2005-10-29 18:16:53 -0700 | [diff] [blame] | 251 | int ret = 0; |
| 252 | unsigned seq; |
| 253 | unsigned long pfn = page_to_pfn(page); |
Cody P Schafer | b5e6a5a | 2013-02-22 16:35:28 -0800 | [diff] [blame] | 254 | unsigned long sp, start_pfn; |
Dave Hansen | c6a57e1 | 2005-10-29 18:16:52 -0700 | [diff] [blame] | 255 | |
Dave Hansen | bdc8cb9 | 2005-10-29 18:16:53 -0700 | [diff] [blame] | 256 | do { |
| 257 | seq = zone_span_seqbegin(zone); |
Cody P Schafer | b5e6a5a | 2013-02-22 16:35:28 -0800 | [diff] [blame] | 258 | start_pfn = zone->zone_start_pfn; |
| 259 | sp = zone->spanned_pages; |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 260 | if (!zone_spans_pfn(zone, pfn)) |
Dave Hansen | bdc8cb9 | 2005-10-29 18:16:53 -0700 | [diff] [blame] | 261 | ret = 1; |
| 262 | } while (zone_span_seqretry(zone, seq)); |
| 263 | |
Cody P Schafer | b5e6a5a | 2013-02-22 16:35:28 -0800 | [diff] [blame] | 264 | if (ret) |
Dave Hansen | 613813e | 2014-06-04 16:07:27 -0700 | [diff] [blame] | 265 | pr_err("page 0x%lx outside node %d zone %s [ 0x%lx - 0x%lx ]\n", |
| 266 | pfn, zone_to_nid(zone), zone->name, |
| 267 | start_pfn, start_pfn + sp); |
Cody P Schafer | b5e6a5a | 2013-02-22 16:35:28 -0800 | [diff] [blame] | 268 | |
Dave Hansen | bdc8cb9 | 2005-10-29 18:16:53 -0700 | [diff] [blame] | 269 | return ret; |
Dave Hansen | c6a57e1 | 2005-10-29 18:16:52 -0700 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | static int page_is_consistent(struct zone *zone, struct page *page) |
| 273 | { |
Andy Whitcroft | 14e0729 | 2007-05-06 14:49:14 -0700 | [diff] [blame] | 274 | if (!pfn_valid_within(page_to_pfn(page))) |
Dave Hansen | c6a57e1 | 2005-10-29 18:16:52 -0700 | [diff] [blame] | 275 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | if (zone != page_zone(page)) |
Dave Hansen | c6a57e1 | 2005-10-29 18:16:52 -0700 | [diff] [blame] | 277 | return 0; |
| 278 | |
| 279 | return 1; |
| 280 | } |
| 281 | /* |
| 282 | * Temporary debugging check for pages not lying within a given zone. |
| 283 | */ |
| 284 | static int bad_range(struct zone *zone, struct page *page) |
| 285 | { |
| 286 | if (page_outside_zone_boundaries(zone, page)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | return 1; |
Dave Hansen | c6a57e1 | 2005-10-29 18:16:52 -0700 | [diff] [blame] | 288 | if (!page_is_consistent(zone, page)) |
| 289 | return 1; |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | return 0; |
| 292 | } |
Nick Piggin | 13e7444 | 2006-01-06 00:10:58 -0800 | [diff] [blame] | 293 | #else |
| 294 | static inline int bad_range(struct zone *zone, struct page *page) |
| 295 | { |
| 296 | return 0; |
| 297 | } |
| 298 | #endif |
| 299 | |
Kirill A. Shutemov | d230dec | 2014-04-07 15:37:38 -0700 | [diff] [blame] | 300 | static void bad_page(struct page *page, const char *reason, |
| 301 | unsigned long bad_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
Hugh Dickins | d936cf9 | 2009-01-06 14:40:12 -0800 | [diff] [blame] | 303 | static unsigned long resume; |
| 304 | static unsigned long nr_shown; |
| 305 | static unsigned long nr_unshown; |
| 306 | |
Wu Fengguang | 2a7684a | 2009-09-16 11:50:12 +0200 | [diff] [blame] | 307 | /* Don't complain about poisoned pages */ |
| 308 | if (PageHWPoison(page)) { |
Mel Gorman | 22b751c | 2013-02-22 16:34:59 -0800 | [diff] [blame] | 309 | page_mapcount_reset(page); /* remove PageBuddy */ |
Wu Fengguang | 2a7684a | 2009-09-16 11:50:12 +0200 | [diff] [blame] | 310 | return; |
| 311 | } |
| 312 | |
Hugh Dickins | d936cf9 | 2009-01-06 14:40:12 -0800 | [diff] [blame] | 313 | /* |
| 314 | * Allow a burst of 60 reports, then keep quiet for that minute; |
| 315 | * or allow a steady drip of one report per second. |
| 316 | */ |
| 317 | if (nr_shown == 60) { |
| 318 | if (time_before(jiffies, resume)) { |
| 319 | nr_unshown++; |
| 320 | goto out; |
| 321 | } |
| 322 | if (nr_unshown) { |
Hugh Dickins | 1e9e636 | 2009-01-06 14:40:13 -0800 | [diff] [blame] | 323 | printk(KERN_ALERT |
| 324 | "BUG: Bad page state: %lu messages suppressed\n", |
Hugh Dickins | d936cf9 | 2009-01-06 14:40:12 -0800 | [diff] [blame] | 325 | nr_unshown); |
| 326 | nr_unshown = 0; |
| 327 | } |
| 328 | nr_shown = 0; |
| 329 | } |
| 330 | if (nr_shown++ == 0) |
| 331 | resume = jiffies + 60 * HZ; |
| 332 | |
Hugh Dickins | 1e9e636 | 2009-01-06 14:40:13 -0800 | [diff] [blame] | 333 | printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n", |
Hugh Dickins | 3dc1474 | 2009-01-06 14:40:08 -0800 | [diff] [blame] | 334 | current->comm, page_to_pfn(page)); |
Dave Hansen | f0b791a | 2014-01-23 15:52:49 -0800 | [diff] [blame] | 335 | dump_page_badflags(page, reason, bad_flags); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 336 | |
Dave Jones | 4f31888 | 2011-10-31 17:07:24 -0700 | [diff] [blame] | 337 | print_modules(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | dump_stack(); |
Hugh Dickins | d936cf9 | 2009-01-06 14:40:12 -0800 | [diff] [blame] | 339 | out: |
Hugh Dickins | 8cc3b39 | 2009-01-06 14:40:06 -0800 | [diff] [blame] | 340 | /* Leave bad fields for debug, except PageBuddy could make trouble */ |
Mel Gorman | 22b751c | 2013-02-22 16:34:59 -0800 | [diff] [blame] | 341 | page_mapcount_reset(page); /* remove PageBuddy */ |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 342 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | /* |
| 346 | * Higher-order pages are called "compound pages". They are structured thusly: |
| 347 | * |
| 348 | * The first PAGE_SIZE page is called the "head page". |
| 349 | * |
| 350 | * The remaining PAGE_SIZE pages are called "tail pages". |
| 351 | * |
Wang Sheng-Hui | 6416b9f | 2011-11-17 10:53:50 +0100 | [diff] [blame] | 352 | * All pages have PG_compound set. All tail pages have their ->first_page |
| 353 | * pointing at the head page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | * |
Hugh Dickins | 41d78ba | 2006-02-14 13:52:58 -0800 | [diff] [blame] | 355 | * The first tail page's ->lru.next holds the address of the compound page's |
| 356 | * put_page() function. Its ->lru.prev holds the order of allocation. |
| 357 | * This usage means that zero-order pages may not be compound. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | */ |
Hugh Dickins | d98c7a0 | 2006-02-14 13:52:59 -0800 | [diff] [blame] | 359 | |
| 360 | static void free_compound_page(struct page *page) |
| 361 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 362 | __free_pages_ok(page, compound_order(page)); |
Hugh Dickins | d98c7a0 | 2006-02-14 13:52:59 -0800 | [diff] [blame] | 363 | } |
| 364 | |
Andi Kleen | 01ad1c0 | 2008-07-23 21:27:46 -0700 | [diff] [blame] | 365 | void prep_compound_page(struct page *page, unsigned long order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | { |
| 367 | int i; |
| 368 | int nr_pages = 1 << order; |
| 369 | |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 370 | set_compound_page_dtor(page, free_compound_page); |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 371 | set_compound_order(page, order); |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 372 | __SetPageHead(page); |
Andy Whitcroft | 18229df | 2008-11-06 12:53:27 -0800 | [diff] [blame] | 373 | for (i = 1; i < nr_pages; i++) { |
| 374 | struct page *p = page + i; |
Youquan Song | 58a84aa | 2011-12-08 14:34:18 -0800 | [diff] [blame] | 375 | set_page_count(p, 0); |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 376 | p->first_page = page; |
David Rientjes | 668f9abb | 2014-03-03 15:38:18 -0800 | [diff] [blame] | 377 | /* Make sure p->first_page is always valid for PageTail() */ |
| 378 | smp_wmb(); |
| 379 | __SetPageTail(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
| 381 | } |
| 382 | |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 383 | static inline void prep_zero_page(struct page *page, unsigned int order, |
| 384 | gfp_t gfp_flags) |
Nick Piggin | 17cf440 | 2006-03-22 00:08:41 -0800 | [diff] [blame] | 385 | { |
| 386 | int i; |
| 387 | |
Andrew Morton | 6626c5d | 2006-03-22 00:08:42 -0800 | [diff] [blame] | 388 | /* |
| 389 | * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO |
| 390 | * and __GFP_HIGHMEM from hard or soft interrupt context. |
| 391 | */ |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 392 | VM_BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt()); |
Nick Piggin | 17cf440 | 2006-03-22 00:08:41 -0800 | [diff] [blame] | 393 | for (i = 0; i < (1 << order); i++) |
| 394 | clear_highpage(page + i); |
| 395 | } |
| 396 | |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 397 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 398 | unsigned int _debug_guardpage_minorder; |
Joonsoo Kim | 031bc57 | 2014-12-12 16:55:52 -0800 | [diff] [blame] | 399 | bool _debug_pagealloc_enabled __read_mostly; |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 400 | bool _debug_guardpage_enabled __read_mostly; |
| 401 | |
Joonsoo Kim | 031bc57 | 2014-12-12 16:55:52 -0800 | [diff] [blame] | 402 | static int __init early_debug_pagealloc(char *buf) |
| 403 | { |
| 404 | if (!buf) |
| 405 | return -EINVAL; |
| 406 | |
| 407 | if (strcmp(buf, "on") == 0) |
| 408 | _debug_pagealloc_enabled = true; |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | early_param("debug_pagealloc", early_debug_pagealloc); |
| 413 | |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 414 | static bool need_debug_guardpage(void) |
| 415 | { |
Joonsoo Kim | 031bc57 | 2014-12-12 16:55:52 -0800 | [diff] [blame] | 416 | /* If we don't use debug_pagealloc, we don't need guard page */ |
| 417 | if (!debug_pagealloc_enabled()) |
| 418 | return false; |
| 419 | |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 420 | return true; |
| 421 | } |
| 422 | |
| 423 | static void init_debug_guardpage(void) |
| 424 | { |
Joonsoo Kim | 031bc57 | 2014-12-12 16:55:52 -0800 | [diff] [blame] | 425 | if (!debug_pagealloc_enabled()) |
| 426 | return; |
| 427 | |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 428 | _debug_guardpage_enabled = true; |
| 429 | } |
| 430 | |
| 431 | struct page_ext_operations debug_guardpage_ops = { |
| 432 | .need = need_debug_guardpage, |
| 433 | .init = init_debug_guardpage, |
| 434 | }; |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 435 | |
| 436 | static int __init debug_guardpage_minorder_setup(char *buf) |
| 437 | { |
| 438 | unsigned long res; |
| 439 | |
| 440 | if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { |
| 441 | printk(KERN_ERR "Bad debug_guardpage_minorder value\n"); |
| 442 | return 0; |
| 443 | } |
| 444 | _debug_guardpage_minorder = res; |
| 445 | printk(KERN_INFO "Setting debug_guardpage_minorder to %lu\n", res); |
| 446 | return 0; |
| 447 | } |
| 448 | __setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup); |
| 449 | |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 450 | static inline void set_page_guard(struct zone *zone, struct page *page, |
| 451 | unsigned int order, int migratetype) |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 452 | { |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 453 | struct page_ext *page_ext; |
| 454 | |
| 455 | if (!debug_guardpage_enabled()) |
| 456 | return; |
| 457 | |
| 458 | page_ext = lookup_page_ext(page); |
| 459 | __set_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); |
| 460 | |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 461 | INIT_LIST_HEAD(&page->lru); |
| 462 | set_page_private(page, order); |
| 463 | /* Guard pages are not available for any usage */ |
| 464 | __mod_zone_freepage_state(zone, -(1 << order), migratetype); |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 465 | } |
| 466 | |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 467 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
| 468 | unsigned int order, int migratetype) |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 469 | { |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 470 | struct page_ext *page_ext; |
| 471 | |
| 472 | if (!debug_guardpage_enabled()) |
| 473 | return; |
| 474 | |
| 475 | page_ext = lookup_page_ext(page); |
| 476 | __clear_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); |
| 477 | |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 478 | set_page_private(page, 0); |
| 479 | if (!is_migrate_isolate(migratetype)) |
| 480 | __mod_zone_freepage_state(zone, (1 << order), migratetype); |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 481 | } |
| 482 | #else |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 483 | struct page_ext_operations debug_guardpage_ops = { NULL, }; |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 484 | static inline void set_page_guard(struct zone *zone, struct page *page, |
| 485 | unsigned int order, int migratetype) {} |
| 486 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
| 487 | unsigned int order, int migratetype) {} |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 488 | #endif |
| 489 | |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 490 | static inline void set_page_order(struct page *page, unsigned int order) |
Andrew Morton | 6aa3001b2 | 2006-04-18 22:20:52 -0700 | [diff] [blame] | 491 | { |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 492 | set_page_private(page, order); |
Nick Piggin | 676165a | 2006-04-10 11:21:48 +1000 | [diff] [blame] | 493 | __SetPageBuddy(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | static inline void rmv_page_order(struct page *page) |
| 497 | { |
Nick Piggin | 676165a | 2006-04-10 11:21:48 +1000 | [diff] [blame] | 498 | __ClearPageBuddy(page); |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 499 | set_page_private(page, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | * This function checks whether a page is free && is the buddy |
| 504 | * we can do coalesce a page and its buddy if |
Nick Piggin | 13e7444 | 2006-01-06 00:10:58 -0800 | [diff] [blame] | 505 | * (a) the buddy is not in a hole && |
Nick Piggin | 676165a | 2006-04-10 11:21:48 +1000 | [diff] [blame] | 506 | * (b) the buddy is in the buddy system && |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 507 | * (c) a page and its buddy have the same order && |
| 508 | * (d) a page and its buddy are in the same zone. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | * |
Wang Sheng-Hui | cf6fe94 | 2013-09-11 14:22:48 -0700 | [diff] [blame] | 510 | * For recording whether a page is in the buddy system, we set ->_mapcount |
| 511 | * PAGE_BUDDY_MAPCOUNT_VALUE. |
| 512 | * Setting, clearing, and testing _mapcount PAGE_BUDDY_MAPCOUNT_VALUE is |
| 513 | * serialized by zone->lock. |
Nick Piggin | 676165a | 2006-04-10 11:21:48 +1000 | [diff] [blame] | 514 | * |
| 515 | * For recording page's order, we use page_private(page). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | */ |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 517 | static inline int page_is_buddy(struct page *page, struct page *buddy, |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 518 | unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | { |
Andy Whitcroft | 14e0729 | 2007-05-06 14:49:14 -0700 | [diff] [blame] | 520 | if (!pfn_valid_within(page_to_pfn(buddy))) |
Nick Piggin | 13e7444 | 2006-01-06 00:10:58 -0800 | [diff] [blame] | 521 | return 0; |
Nick Piggin | 13e7444 | 2006-01-06 00:10:58 -0800 | [diff] [blame] | 522 | |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 523 | if (page_is_guard(buddy) && page_order(buddy) == order) { |
Mel Gorman | d34c5fa | 2014-06-04 16:10:10 -0700 | [diff] [blame] | 524 | if (page_zone_id(page) != page_zone_id(buddy)) |
| 525 | return 0; |
| 526 | |
Weijie Yang | 4c5018c | 2015-02-10 14:11:39 -0800 | [diff] [blame] | 527 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
| 528 | |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 529 | return 1; |
| 530 | } |
| 531 | |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 532 | if (PageBuddy(buddy) && page_order(buddy) == order) { |
Mel Gorman | d34c5fa | 2014-06-04 16:10:10 -0700 | [diff] [blame] | 533 | /* |
| 534 | * zone check is done late to avoid uselessly |
| 535 | * calculating zone/node ids for pages that could |
| 536 | * never merge. |
| 537 | */ |
| 538 | if (page_zone_id(page) != page_zone_id(buddy)) |
| 539 | return 0; |
| 540 | |
Weijie Yang | 4c5018c | 2015-02-10 14:11:39 -0800 | [diff] [blame] | 541 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
| 542 | |
Andrew Morton | 6aa3001b2 | 2006-04-18 22:20:52 -0700 | [diff] [blame] | 543 | return 1; |
Nick Piggin | 676165a | 2006-04-10 11:21:48 +1000 | [diff] [blame] | 544 | } |
Andrew Morton | 6aa3001b2 | 2006-04-18 22:20:52 -0700 | [diff] [blame] | 545 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | /* |
| 549 | * Freeing function for a buddy system allocator. |
| 550 | * |
| 551 | * The concept of a buddy system is to maintain direct-mapped table |
| 552 | * (containing bit values) for memory blocks of various "orders". |
| 553 | * The bottom level table contains the map for the smallest allocatable |
| 554 | * units of memory (here, pages), and each level above it describes |
| 555 | * pairs of units from the levels below, hence, "buddies". |
| 556 | * At a high level, all that happens here is marking the table entry |
| 557 | * at the bottom level available, and propagating the changes upward |
| 558 | * as necessary, plus some accounting needed to play nicely with other |
| 559 | * parts of the VM system. |
| 560 | * At each level, we keep a list of pages, which are heads of continuous |
Wang Sheng-Hui | cf6fe94 | 2013-09-11 14:22:48 -0700 | [diff] [blame] | 561 | * free pages of length of (1 << order) and marked with _mapcount |
| 562 | * PAGE_BUDDY_MAPCOUNT_VALUE. Page's order is recorded in page_private(page) |
| 563 | * field. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | * So when we are allocating or freeing one, we can derive the state of the |
Michal Nazarewicz | 5f63b72 | 2012-01-11 15:16:11 +0100 | [diff] [blame] | 565 | * other. That is, if we allocate a small block, and both were |
| 566 | * free, the remainder of the region must be split into blocks. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | * If a block is freed, and its buddy is also free, then this |
Michal Nazarewicz | 5f63b72 | 2012-01-11 15:16:11 +0100 | [diff] [blame] | 568 | * triggers coalescing into a block of larger size. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | * |
Nadia Yvette Chambers | 6d49e35 | 2012-12-06 10:39:54 +0100 | [diff] [blame] | 570 | * -- nyc |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | */ |
| 572 | |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 573 | static inline void __free_one_page(struct page *page, |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 574 | unsigned long pfn, |
Mel Gorman | ed0ae21 | 2009-06-16 15:32:07 -0700 | [diff] [blame] | 575 | struct zone *zone, unsigned int order, |
| 576 | int migratetype) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
| 578 | unsigned long page_idx; |
Corrado Zoccolo | 6dda9d5 | 2010-05-24 14:31:54 -0700 | [diff] [blame] | 579 | unsigned long combined_idx; |
KyongHo Cho | 43506fa | 2011-01-13 15:47:24 -0800 | [diff] [blame] | 580 | unsigned long uninitialized_var(buddy_idx); |
Corrado Zoccolo | 6dda9d5 | 2010-05-24 14:31:54 -0700 | [diff] [blame] | 581 | struct page *buddy; |
Joonsoo Kim | 3c60509 | 2014-11-13 15:19:21 -0800 | [diff] [blame] | 582 | int max_order = MAX_ORDER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Cody P Schafer | d29bb97 | 2013-02-22 16:35:25 -0800 | [diff] [blame] | 584 | VM_BUG_ON(!zone_is_initialized(zone)); |
Kirill A. Shutemov | 6e9f0d5 | 2015-02-11 15:25:50 -0800 | [diff] [blame] | 585 | VM_BUG_ON_PAGE(page->flags & PAGE_FLAGS_CHECK_AT_PREP, page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Mel Gorman | ed0ae21 | 2009-06-16 15:32:07 -0700 | [diff] [blame] | 587 | VM_BUG_ON(migratetype == -1); |
Joonsoo Kim | 3c60509 | 2014-11-13 15:19:21 -0800 | [diff] [blame] | 588 | if (is_migrate_isolate(migratetype)) { |
| 589 | /* |
| 590 | * We restrict max order of merging to prevent merge |
| 591 | * between freepages on isolate pageblock and normal |
| 592 | * pageblock. Without this, pageblock isolation |
| 593 | * could cause incorrect freepage accounting. |
| 594 | */ |
| 595 | max_order = min(MAX_ORDER, pageblock_order + 1); |
| 596 | } else { |
Joonsoo Kim | 8f82b55 | 2014-11-13 15:19:18 -0800 | [diff] [blame] | 597 | __mod_zone_freepage_state(zone, 1 << order, migratetype); |
Joonsoo Kim | 3c60509 | 2014-11-13 15:19:21 -0800 | [diff] [blame] | 598 | } |
Mel Gorman | ed0ae21 | 2009-06-16 15:32:07 -0700 | [diff] [blame] | 599 | |
Joonsoo Kim | 3c60509 | 2014-11-13 15:19:21 -0800 | [diff] [blame] | 600 | page_idx = pfn & ((1 << max_order) - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 602 | VM_BUG_ON_PAGE(page_idx & ((1 << order) - 1), page); |
| 603 | VM_BUG_ON_PAGE(bad_range(zone, page), page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
Joonsoo Kim | 3c60509 | 2014-11-13 15:19:21 -0800 | [diff] [blame] | 605 | while (order < max_order - 1) { |
KyongHo Cho | 43506fa | 2011-01-13 15:47:24 -0800 | [diff] [blame] | 606 | buddy_idx = __find_buddy_index(page_idx, order); |
| 607 | buddy = page + (buddy_idx - page_idx); |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 608 | if (!page_is_buddy(page, buddy, order)) |
Andy Whitcroft | 3c82d0c | 2008-07-23 21:27:11 -0700 | [diff] [blame] | 609 | break; |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 610 | /* |
| 611 | * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, |
| 612 | * merge with it and move up one order. |
| 613 | */ |
| 614 | if (page_is_guard(buddy)) { |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 615 | clear_page_guard(zone, buddy, order, migratetype); |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 616 | } else { |
| 617 | list_del(&buddy->lru); |
| 618 | zone->free_area[order].nr_free--; |
| 619 | rmv_page_order(buddy); |
| 620 | } |
KyongHo Cho | 43506fa | 2011-01-13 15:47:24 -0800 | [diff] [blame] | 621 | combined_idx = buddy_idx & page_idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | page = page + (combined_idx - page_idx); |
| 623 | page_idx = combined_idx; |
| 624 | order++; |
| 625 | } |
| 626 | set_page_order(page, order); |
Corrado Zoccolo | 6dda9d5 | 2010-05-24 14:31:54 -0700 | [diff] [blame] | 627 | |
| 628 | /* |
| 629 | * If this is not the largest possible page, check if the buddy |
| 630 | * of the next-highest order is free. If it is, it's possible |
| 631 | * that pages are being freed that will coalesce soon. In case, |
| 632 | * that is happening, add the free page to the tail of the list |
| 633 | * so it's less likely to be used soon and more likely to be merged |
| 634 | * as a higher order page |
| 635 | */ |
Mel Gorman | b7f50cf | 2010-10-26 14:21:11 -0700 | [diff] [blame] | 636 | if ((order < MAX_ORDER-2) && pfn_valid_within(page_to_pfn(buddy))) { |
Corrado Zoccolo | 6dda9d5 | 2010-05-24 14:31:54 -0700 | [diff] [blame] | 637 | struct page *higher_page, *higher_buddy; |
KyongHo Cho | 43506fa | 2011-01-13 15:47:24 -0800 | [diff] [blame] | 638 | combined_idx = buddy_idx & page_idx; |
| 639 | higher_page = page + (combined_idx - page_idx); |
| 640 | buddy_idx = __find_buddy_index(combined_idx, order + 1); |
Li Haifeng | 0ba8f2d | 2012-09-17 14:09:21 -0700 | [diff] [blame] | 641 | higher_buddy = higher_page + (buddy_idx - combined_idx); |
Corrado Zoccolo | 6dda9d5 | 2010-05-24 14:31:54 -0700 | [diff] [blame] | 642 | if (page_is_buddy(higher_page, higher_buddy, order + 1)) { |
| 643 | list_add_tail(&page->lru, |
| 644 | &zone->free_area[order].free_list[migratetype]); |
| 645 | goto out; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | list_add(&page->lru, &zone->free_area[order].free_list[migratetype]); |
| 650 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | zone->free_area[order].nr_free++; |
| 652 | } |
| 653 | |
Nick Piggin | 224abf9 | 2006-01-06 00:11:11 -0800 | [diff] [blame] | 654 | static inline int free_pages_check(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
Kirill A. Shutemov | d230dec | 2014-04-07 15:37:38 -0700 | [diff] [blame] | 656 | const char *bad_reason = NULL; |
Dave Hansen | f0b791a | 2014-01-23 15:52:49 -0800 | [diff] [blame] | 657 | unsigned long bad_flags = 0; |
| 658 | |
| 659 | if (unlikely(page_mapcount(page))) |
| 660 | bad_reason = "nonzero mapcount"; |
| 661 | if (unlikely(page->mapping != NULL)) |
| 662 | bad_reason = "non-NULL mapping"; |
| 663 | if (unlikely(atomic_read(&page->_count) != 0)) |
| 664 | bad_reason = "nonzero _count"; |
| 665 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE)) { |
| 666 | bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set"; |
| 667 | bad_flags = PAGE_FLAGS_CHECK_AT_FREE; |
| 668 | } |
Johannes Weiner | 9edad6e | 2014-12-10 15:44:58 -0800 | [diff] [blame] | 669 | #ifdef CONFIG_MEMCG |
| 670 | if (unlikely(page->mem_cgroup)) |
| 671 | bad_reason = "page still charged to cgroup"; |
| 672 | #endif |
Dave Hansen | f0b791a | 2014-01-23 15:52:49 -0800 | [diff] [blame] | 673 | if (unlikely(bad_reason)) { |
| 674 | bad_page(page, bad_reason, bad_flags); |
Hugh Dickins | 79f4b7b | 2009-01-06 14:40:05 -0800 | [diff] [blame] | 675 | return 1; |
Hugh Dickins | 8cc3b39 | 2009-01-06 14:40:06 -0800 | [diff] [blame] | 676 | } |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 677 | page_cpupid_reset_last(page); |
Hugh Dickins | 79f4b7b | 2009-01-06 14:40:05 -0800 | [diff] [blame] | 678 | if (page->flags & PAGE_FLAGS_CHECK_AT_PREP) |
| 679 | page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; |
| 680 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | /* |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 684 | * Frees a number of pages from the PCP lists |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | * Assumes all pages on list are in same zone, and of same order. |
Renaud Lienhart | 207f36e | 2005-09-10 00:26:59 -0700 | [diff] [blame] | 686 | * count is the number of pages to free. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | * |
| 688 | * If the zone was previously in an "all pages pinned" state then look to |
| 689 | * see if this freeing clears that state. |
| 690 | * |
| 691 | * And clear the zone's pages_scanned counter, to hold off the "all pages are |
| 692 | * pinned" detection logic. |
| 693 | */ |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 694 | static void free_pcppages_bulk(struct zone *zone, int count, |
| 695 | struct per_cpu_pages *pcp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | { |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 697 | int migratetype = 0; |
Mel Gorman | a6f9edd | 2009-09-21 17:03:20 -0700 | [diff] [blame] | 698 | int batch_free = 0; |
Mel Gorman | 72853e2 | 2010-09-09 16:38:16 -0700 | [diff] [blame] | 699 | int to_free = count; |
Mel Gorman | 0d5d823 | 2014-08-06 16:07:16 -0700 | [diff] [blame] | 700 | unsigned long nr_scanned; |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 701 | |
Nick Piggin | c54ad30 | 2006-01-06 00:10:56 -0800 | [diff] [blame] | 702 | spin_lock(&zone->lock); |
Mel Gorman | 0d5d823 | 2014-08-06 16:07:16 -0700 | [diff] [blame] | 703 | nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); |
| 704 | if (nr_scanned) |
| 705 | __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); |
Mel Gorman | f2260e6 | 2009-06-16 15:32:13 -0700 | [diff] [blame] | 706 | |
Mel Gorman | 72853e2 | 2010-09-09 16:38:16 -0700 | [diff] [blame] | 707 | while (to_free) { |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 708 | struct page *page; |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 709 | struct list_head *list; |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 710 | |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 711 | /* |
Mel Gorman | a6f9edd | 2009-09-21 17:03:20 -0700 | [diff] [blame] | 712 | * Remove pages from lists in a round-robin fashion. A |
| 713 | * batch_free count is maintained that is incremented when an |
| 714 | * empty list is encountered. This is so more pages are freed |
| 715 | * off fuller lists instead of spinning excessively around empty |
| 716 | * lists |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 717 | */ |
| 718 | do { |
Mel Gorman | a6f9edd | 2009-09-21 17:03:20 -0700 | [diff] [blame] | 719 | batch_free++; |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 720 | if (++migratetype == MIGRATE_PCPTYPES) |
| 721 | migratetype = 0; |
| 722 | list = &pcp->lists[migratetype]; |
| 723 | } while (list_empty(list)); |
| 724 | |
Namhyung Kim | 1d16871 | 2011-03-22 16:32:45 -0700 | [diff] [blame] | 725 | /* This is the only non-empty list. Free them all. */ |
| 726 | if (batch_free == MIGRATE_PCPTYPES) |
| 727 | batch_free = to_free; |
| 728 | |
Mel Gorman | a6f9edd | 2009-09-21 17:03:20 -0700 | [diff] [blame] | 729 | do { |
Bartlomiej Zolnierkiewicz | 770c8aa | 2012-10-08 16:31:57 -0700 | [diff] [blame] | 730 | int mt; /* migratetype of the to-be-freed page */ |
| 731 | |
Mel Gorman | a6f9edd | 2009-09-21 17:03:20 -0700 | [diff] [blame] | 732 | page = list_entry(list->prev, struct page, lru); |
| 733 | /* must delete as __free_one_page list manipulates */ |
| 734 | list_del(&page->lru); |
Minchan Kim | b12c4ad | 2012-10-08 16:32:08 -0700 | [diff] [blame] | 735 | mt = get_freepage_migratetype(page); |
Joonsoo Kim | 8f82b55 | 2014-11-13 15:19:18 -0800 | [diff] [blame] | 736 | if (unlikely(has_isolate_pageblock(zone))) |
Joonsoo Kim | 51bb1a4 | 2014-11-13 15:19:14 -0800 | [diff] [blame] | 737 | mt = get_pageblock_migratetype(page); |
Joonsoo Kim | 51bb1a4 | 2014-11-13 15:19:14 -0800 | [diff] [blame] | 738 | |
Hugh Dickins | a701623 | 2010-01-29 17:46:34 +0000 | [diff] [blame] | 739 | /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */ |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 740 | __free_one_page(page, page_to_pfn(page), zone, 0, mt); |
Bartlomiej Zolnierkiewicz | 770c8aa | 2012-10-08 16:31:57 -0700 | [diff] [blame] | 741 | trace_mm_page_pcpu_drain(page, 0, mt); |
Mel Gorman | 72853e2 | 2010-09-09 16:38:16 -0700 | [diff] [blame] | 742 | } while (--to_free && --batch_free && !list_empty(list)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
Nick Piggin | c54ad30 | 2006-01-06 00:10:56 -0800 | [diff] [blame] | 744 | spin_unlock(&zone->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |
| 746 | |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 747 | static void free_one_page(struct zone *zone, |
| 748 | struct page *page, unsigned long pfn, |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 749 | unsigned int order, |
Mel Gorman | ed0ae21 | 2009-06-16 15:32:07 -0700 | [diff] [blame] | 750 | int migratetype) |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 751 | { |
Mel Gorman | 0d5d823 | 2014-08-06 16:07:16 -0700 | [diff] [blame] | 752 | unsigned long nr_scanned; |
Christoph Lameter | 006d22d | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 753 | spin_lock(&zone->lock); |
Mel Gorman | 0d5d823 | 2014-08-06 16:07:16 -0700 | [diff] [blame] | 754 | nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); |
| 755 | if (nr_scanned) |
| 756 | __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); |
Mel Gorman | f2260e6 | 2009-06-16 15:32:13 -0700 | [diff] [blame] | 757 | |
Joonsoo Kim | ad53f92 | 2014-11-13 15:19:11 -0800 | [diff] [blame] | 758 | if (unlikely(has_isolate_pageblock(zone) || |
| 759 | is_migrate_isolate(migratetype))) { |
| 760 | migratetype = get_pfnblock_migratetype(page, pfn); |
Joonsoo Kim | ad53f92 | 2014-11-13 15:19:11 -0800 | [diff] [blame] | 761 | } |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 762 | __free_one_page(page, pfn, zone, order, migratetype); |
Christoph Lameter | 006d22d | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 763 | spin_unlock(&zone->lock); |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 764 | } |
| 765 | |
Kirill A. Shutemov | 81422f2 | 2015-02-11 15:25:52 -0800 | [diff] [blame] | 766 | static int free_tail_pages_check(struct page *head_page, struct page *page) |
| 767 | { |
| 768 | if (!IS_ENABLED(CONFIG_DEBUG_VM)) |
| 769 | return 0; |
| 770 | if (unlikely(!PageTail(page))) { |
| 771 | bad_page(page, "PageTail not set", 0); |
| 772 | return 1; |
| 773 | } |
| 774 | if (unlikely(page->first_page != head_page)) { |
| 775 | bad_page(page, "first_page not consistent", 0); |
| 776 | return 1; |
| 777 | } |
| 778 | return 0; |
| 779 | } |
| 780 | |
KOSAKI Motohiro | ec95f53 | 2010-05-24 14:32:38 -0700 | [diff] [blame] | 781 | static bool free_pages_prepare(struct page *page, unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | { |
Kirill A. Shutemov | 81422f2 | 2015-02-11 15:25:52 -0800 | [diff] [blame] | 783 | bool compound = PageCompound(page); |
| 784 | int i, bad = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Yu Zhao | ab1f306 | 2014-12-10 15:43:17 -0800 | [diff] [blame] | 786 | VM_BUG_ON_PAGE(PageTail(page), page); |
Kirill A. Shutemov | 81422f2 | 2015-02-11 15:25:52 -0800 | [diff] [blame] | 787 | VM_BUG_ON_PAGE(compound && compound_order(page) != order, page); |
Yu Zhao | ab1f306 | 2014-12-10 15:43:17 -0800 | [diff] [blame] | 788 | |
Konstantin Khlebnikov | b413d48 | 2012-01-10 15:07:09 -0800 | [diff] [blame] | 789 | trace_mm_page_free(page, order); |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 790 | kmemcheck_free_shadow(page, order); |
Andrey Ryabinin | b8c73fc | 2015-02-13 14:39:28 -0800 | [diff] [blame] | 791 | kasan_free_pages(page, order); |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 792 | |
Andrea Arcangeli | 8dd60a3 | 2011-01-13 15:46:34 -0800 | [diff] [blame] | 793 | if (PageAnon(page)) |
| 794 | page->mapping = NULL; |
Kirill A. Shutemov | 81422f2 | 2015-02-11 15:25:52 -0800 | [diff] [blame] | 795 | bad += free_pages_check(page); |
| 796 | for (i = 1; i < (1 << order); i++) { |
| 797 | if (compound) |
| 798 | bad += free_tail_pages_check(page, page + i); |
Andrea Arcangeli | 8dd60a3 | 2011-01-13 15:46:34 -0800 | [diff] [blame] | 799 | bad += free_pages_check(page + i); |
Kirill A. Shutemov | 81422f2 | 2015-02-11 15:25:52 -0800 | [diff] [blame] | 800 | } |
Hugh Dickins | 8cc3b39 | 2009-01-06 14:40:06 -0800 | [diff] [blame] | 801 | if (bad) |
KOSAKI Motohiro | ec95f53 | 2010-05-24 14:32:38 -0700 | [diff] [blame] | 802 | return false; |
Hugh Dickins | 689bceb | 2005-11-21 21:32:20 -0800 | [diff] [blame] | 803 | |
Joonsoo Kim | 48c96a3 | 2014-12-12 16:56:01 -0800 | [diff] [blame] | 804 | reset_page_owner(page, order); |
| 805 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 806 | if (!PageHighMem(page)) { |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 807 | debug_check_no_locks_freed(page_address(page), |
| 808 | PAGE_SIZE << order); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 809 | debug_check_no_obj_freed(page_address(page), |
| 810 | PAGE_SIZE << order); |
| 811 | } |
Nick Piggin | dafb136 | 2006-10-11 01:21:30 -0700 | [diff] [blame] | 812 | arch_free_page(page, order); |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 813 | kernel_map_pages(page, 1 << order, 0); |
Nick Piggin | dafb136 | 2006-10-11 01:21:30 -0700 | [diff] [blame] | 814 | |
KOSAKI Motohiro | ec95f53 | 2010-05-24 14:32:38 -0700 | [diff] [blame] | 815 | return true; |
| 816 | } |
| 817 | |
| 818 | static void __free_pages_ok(struct page *page, unsigned int order) |
| 819 | { |
| 820 | unsigned long flags; |
Minchan Kim | 95e3441 | 2012-10-08 16:32:11 -0700 | [diff] [blame] | 821 | int migratetype; |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 822 | unsigned long pfn = page_to_pfn(page); |
KOSAKI Motohiro | ec95f53 | 2010-05-24 14:32:38 -0700 | [diff] [blame] | 823 | |
| 824 | if (!free_pages_prepare(page, order)) |
| 825 | return; |
| 826 | |
Mel Gorman | cfc47a2 | 2014-06-04 16:10:19 -0700 | [diff] [blame] | 827 | migratetype = get_pfnblock_migratetype(page, pfn); |
Nick Piggin | c54ad30 | 2006-01-06 00:10:56 -0800 | [diff] [blame] | 828 | local_irq_save(flags); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 829 | __count_vm_events(PGFREE, 1 << order); |
Minchan Kim | 95e3441 | 2012-10-08 16:32:11 -0700 | [diff] [blame] | 830 | set_freepage_migratetype(page, migratetype); |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 831 | free_one_page(page_zone(page), page, pfn, order, migratetype); |
Nick Piggin | c54ad30 | 2006-01-06 00:10:56 -0800 | [diff] [blame] | 832 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
| 834 | |
Jiang Liu | 170a5a7 | 2013-07-03 15:03:17 -0700 | [diff] [blame] | 835 | void __init __free_pages_bootmem(struct page *page, unsigned int order) |
David Howells | a226f6c | 2006-01-06 00:11:08 -0800 | [diff] [blame] | 836 | { |
Johannes Weiner | c399307 | 2012-01-10 15:08:10 -0800 | [diff] [blame] | 837 | unsigned int nr_pages = 1 << order; |
Yinghai Lu | e2d0bd2 | 2013-09-11 14:20:37 -0700 | [diff] [blame] | 838 | struct page *p = page; |
Johannes Weiner | c399307 | 2012-01-10 15:08:10 -0800 | [diff] [blame] | 839 | unsigned int loop; |
David Howells | a226f6c | 2006-01-06 00:11:08 -0800 | [diff] [blame] | 840 | |
Yinghai Lu | e2d0bd2 | 2013-09-11 14:20:37 -0700 | [diff] [blame] | 841 | prefetchw(p); |
| 842 | for (loop = 0; loop < (nr_pages - 1); loop++, p++) { |
| 843 | prefetchw(p + 1); |
Johannes Weiner | c399307 | 2012-01-10 15:08:10 -0800 | [diff] [blame] | 844 | __ClearPageReserved(p); |
| 845 | set_page_count(p, 0); |
David Howells | a226f6c | 2006-01-06 00:11:08 -0800 | [diff] [blame] | 846 | } |
Yinghai Lu | e2d0bd2 | 2013-09-11 14:20:37 -0700 | [diff] [blame] | 847 | __ClearPageReserved(p); |
| 848 | set_page_count(p, 0); |
Johannes Weiner | c399307 | 2012-01-10 15:08:10 -0800 | [diff] [blame] | 849 | |
Yinghai Lu | e2d0bd2 | 2013-09-11 14:20:37 -0700 | [diff] [blame] | 850 | page_zone(page)->managed_pages += nr_pages; |
Johannes Weiner | c399307 | 2012-01-10 15:08:10 -0800 | [diff] [blame] | 851 | set_page_refcounted(page); |
| 852 | __free_pages(page, order); |
David Howells | a226f6c | 2006-01-06 00:11:08 -0800 | [diff] [blame] | 853 | } |
| 854 | |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 855 | #ifdef CONFIG_CMA |
Li Zhong | 9cf510a | 2013-08-23 13:52:52 +0800 | [diff] [blame] | 856 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 857 | void __init init_cma_reserved_pageblock(struct page *page) |
| 858 | { |
| 859 | unsigned i = pageblock_nr_pages; |
| 860 | struct page *p = page; |
| 861 | |
| 862 | do { |
| 863 | __ClearPageReserved(p); |
| 864 | set_page_count(p, 0); |
| 865 | } while (++p, --i); |
| 866 | |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 867 | set_pageblock_migratetype(page, MIGRATE_CMA); |
Michal Nazarewicz | dc78327 | 2014-07-02 15:22:35 -0700 | [diff] [blame] | 868 | |
| 869 | if (pageblock_order >= MAX_ORDER) { |
| 870 | i = pageblock_nr_pages; |
| 871 | p = page; |
| 872 | do { |
| 873 | set_page_refcounted(p); |
| 874 | __free_pages(p, MAX_ORDER - 1); |
| 875 | p += MAX_ORDER_NR_PAGES; |
| 876 | } while (i -= MAX_ORDER_NR_PAGES); |
| 877 | } else { |
| 878 | set_page_refcounted(page); |
| 879 | __free_pages(page, pageblock_order); |
| 880 | } |
| 881 | |
Jiang Liu | 3dcc057 | 2013-07-03 15:03:21 -0700 | [diff] [blame] | 882 | adjust_managed_page_count(page, pageblock_nr_pages); |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 883 | } |
| 884 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | /* |
| 887 | * The order of subdivision here is critical for the IO subsystem. |
| 888 | * Please do not alter this order without good reasons and regression |
| 889 | * testing. Specifically, as large blocks of memory are subdivided, |
| 890 | * the order in which smaller blocks are delivered depends on the order |
| 891 | * they're subdivided in this function. This is the primary factor |
| 892 | * influencing the order in which pages are delivered to the IO |
| 893 | * subsystem according to empirical testing, and this is also justified |
| 894 | * by considering the behavior of a buddy system containing a single |
| 895 | * large block of memory acted on by a series of small allocations. |
| 896 | * This behavior is a critical factor in sglist merging's success. |
| 897 | * |
Nadia Yvette Chambers | 6d49e35 | 2012-12-06 10:39:54 +0100 | [diff] [blame] | 898 | * -- nyc |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | */ |
Nick Piggin | 085cc7d | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 900 | static inline void expand(struct zone *zone, struct page *page, |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 901 | int low, int high, struct free_area *area, |
| 902 | int migratetype) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | { |
| 904 | unsigned long size = 1 << high; |
| 905 | |
| 906 | while (high > low) { |
| 907 | area--; |
| 908 | high--; |
| 909 | size >>= 1; |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 910 | VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 911 | |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 912 | if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 913 | debug_guardpage_enabled() && |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 914 | high < debug_guardpage_minorder()) { |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 915 | /* |
| 916 | * Mark as guard pages (or page), that will allow to |
| 917 | * merge back to allocator when buddy will be freed. |
| 918 | * Corresponding page table entries will not be touched, |
| 919 | * pages will stay not present in virtual address space |
| 920 | */ |
Joonsoo Kim | 2847cf9 | 2014-12-12 16:55:01 -0800 | [diff] [blame] | 921 | set_page_guard(zone, &page[size], high, migratetype); |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 922 | continue; |
| 923 | } |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 924 | list_add(&page[size].lru, &area->free_list[migratetype]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | area->nr_free++; |
| 926 | set_page_order(&page[size], high); |
| 927 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | /* |
| 931 | * This page is about to be returned from the page allocator |
| 932 | */ |
Wu Fengguang | 2a7684a | 2009-09-16 11:50:12 +0200 | [diff] [blame] | 933 | static inline int check_new_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | { |
Kirill A. Shutemov | d230dec | 2014-04-07 15:37:38 -0700 | [diff] [blame] | 935 | const char *bad_reason = NULL; |
Dave Hansen | f0b791a | 2014-01-23 15:52:49 -0800 | [diff] [blame] | 936 | unsigned long bad_flags = 0; |
| 937 | |
| 938 | if (unlikely(page_mapcount(page))) |
| 939 | bad_reason = "nonzero mapcount"; |
| 940 | if (unlikely(page->mapping != NULL)) |
| 941 | bad_reason = "non-NULL mapping"; |
| 942 | if (unlikely(atomic_read(&page->_count) != 0)) |
| 943 | bad_reason = "nonzero _count"; |
| 944 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP)) { |
| 945 | bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set"; |
| 946 | bad_flags = PAGE_FLAGS_CHECK_AT_PREP; |
| 947 | } |
Johannes Weiner | 9edad6e | 2014-12-10 15:44:58 -0800 | [diff] [blame] | 948 | #ifdef CONFIG_MEMCG |
| 949 | if (unlikely(page->mem_cgroup)) |
| 950 | bad_reason = "page still charged to cgroup"; |
| 951 | #endif |
Dave Hansen | f0b791a | 2014-01-23 15:52:49 -0800 | [diff] [blame] | 952 | if (unlikely(bad_reason)) { |
| 953 | bad_page(page, bad_reason, bad_flags); |
Hugh Dickins | 689bceb | 2005-11-21 21:32:20 -0800 | [diff] [blame] | 954 | return 1; |
Hugh Dickins | 8cc3b39 | 2009-01-06 14:40:06 -0800 | [diff] [blame] | 955 | } |
Wu Fengguang | 2a7684a | 2009-09-16 11:50:12 +0200 | [diff] [blame] | 956 | return 0; |
| 957 | } |
| 958 | |
Vlastimil Babka | 7537919 | 2015-02-11 15:25:38 -0800 | [diff] [blame] | 959 | static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, |
| 960 | int alloc_flags) |
Wu Fengguang | 2a7684a | 2009-09-16 11:50:12 +0200 | [diff] [blame] | 961 | { |
| 962 | int i; |
| 963 | |
| 964 | for (i = 0; i < (1 << order); i++) { |
| 965 | struct page *p = page + i; |
| 966 | if (unlikely(check_new_page(p))) |
| 967 | return 1; |
| 968 | } |
Hugh Dickins | 689bceb | 2005-11-21 21:32:20 -0800 | [diff] [blame] | 969 | |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 970 | set_page_private(page, 0); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 971 | set_page_refcounted(page); |
Nick Piggin | cc102509 | 2006-12-06 20:32:00 -0800 | [diff] [blame] | 972 | |
| 973 | arch_alloc_page(page, order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | kernel_map_pages(page, 1 << order, 1); |
Andrey Ryabinin | b8c73fc | 2015-02-13 14:39:28 -0800 | [diff] [blame] | 975 | kasan_alloc_pages(page, order); |
Nick Piggin | 17cf440 | 2006-03-22 00:08:41 -0800 | [diff] [blame] | 976 | |
| 977 | if (gfp_flags & __GFP_ZERO) |
| 978 | prep_zero_page(page, order, gfp_flags); |
| 979 | |
| 980 | if (order && (gfp_flags & __GFP_COMP)) |
| 981 | prep_compound_page(page, order); |
| 982 | |
Joonsoo Kim | 48c96a3 | 2014-12-12 16:56:01 -0800 | [diff] [blame] | 983 | set_page_owner(page, order, gfp_flags); |
| 984 | |
Vlastimil Babka | 7537919 | 2015-02-11 15:25:38 -0800 | [diff] [blame] | 985 | /* |
| 986 | * page->pfmemalloc is set when ALLOC_NO_WATERMARKS was necessary to |
| 987 | * allocate the page. The expectation is that the caller is taking |
| 988 | * steps that will free more memory. The caller should avoid the page |
| 989 | * being used for !PFMEMALLOC purposes. |
| 990 | */ |
| 991 | page->pfmemalloc = !!(alloc_flags & ALLOC_NO_WATERMARKS); |
| 992 | |
Hugh Dickins | 689bceb | 2005-11-21 21:32:20 -0800 | [diff] [blame] | 993 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | } |
| 995 | |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 996 | /* |
| 997 | * Go through the free lists for the given migratetype and remove |
| 998 | * the smallest available page from the freelists |
| 999 | */ |
Mel Gorman | 728ec98 | 2009-06-16 15:32:04 -0700 | [diff] [blame] | 1000 | static inline |
| 1001 | struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 1002 | int migratetype) |
| 1003 | { |
| 1004 | unsigned int current_order; |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 1005 | struct free_area *area; |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 1006 | struct page *page; |
| 1007 | |
| 1008 | /* Find a page of the appropriate size in the preferred list */ |
| 1009 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { |
| 1010 | area = &(zone->free_area[current_order]); |
| 1011 | if (list_empty(&area->free_list[migratetype])) |
| 1012 | continue; |
| 1013 | |
| 1014 | page = list_entry(area->free_list[migratetype].next, |
| 1015 | struct page, lru); |
| 1016 | list_del(&page->lru); |
| 1017 | rmv_page_order(page); |
| 1018 | area->nr_free--; |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 1019 | expand(zone, page, order, current_order, area, migratetype); |
Vlastimil Babka | 5bcc9f8 | 2014-06-04 16:07:22 -0700 | [diff] [blame] | 1020 | set_freepage_migratetype(page, migratetype); |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 1021 | return page; |
| 1022 | } |
| 1023 | |
| 1024 | return NULL; |
| 1025 | } |
| 1026 | |
| 1027 | |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1028 | /* |
| 1029 | * This array describes the order lists are fallen back to when |
| 1030 | * the free lists for the desirable migrate type are depleted |
| 1031 | */ |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 1032 | static int fallbacks[MIGRATE_TYPES][4] = { |
| 1033 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, |
| 1034 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 1035 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE }, |
Joonsoo Kim | dc67647 | 2015-04-14 15:45:15 -0700 | [diff] [blame] | 1036 | #ifdef CONFIG_CMA |
| 1037 | [MIGRATE_CMA] = { MIGRATE_RESERVE }, /* Never used */ |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 1038 | #endif |
Michal Nazarewicz | 6d4a491 | 2012-01-11 15:31:33 +0100 | [diff] [blame] | 1039 | [MIGRATE_RESERVE] = { MIGRATE_RESERVE }, /* Never used */ |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 1040 | #ifdef CONFIG_MEMORY_ISOLATION |
Michal Nazarewicz | 6d4a491 | 2012-01-11 15:31:33 +0100 | [diff] [blame] | 1041 | [MIGRATE_ISOLATE] = { MIGRATE_RESERVE }, /* Never used */ |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 1042 | #endif |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1043 | }; |
| 1044 | |
Joonsoo Kim | dc67647 | 2015-04-14 15:45:15 -0700 | [diff] [blame] | 1045 | #ifdef CONFIG_CMA |
| 1046 | static struct page *__rmqueue_cma_fallback(struct zone *zone, |
| 1047 | unsigned int order) |
| 1048 | { |
| 1049 | return __rmqueue_smallest(zone, order, MIGRATE_CMA); |
| 1050 | } |
| 1051 | #else |
| 1052 | static inline struct page *__rmqueue_cma_fallback(struct zone *zone, |
| 1053 | unsigned int order) { return NULL; } |
| 1054 | #endif |
| 1055 | |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1056 | /* |
| 1057 | * Move the free pages in a range to the free lists of the requested type. |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 1058 | * Note that start_page and end_pages are not aligned on a pageblock |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1059 | * boundary. If alignment is required, use move_freepages_block() |
| 1060 | */ |
Minchan Kim | 435b405 | 2012-10-08 16:32:16 -0700 | [diff] [blame] | 1061 | int move_freepages(struct zone *zone, |
Adrian Bunk | b69a728 | 2008-07-23 21:28:12 -0700 | [diff] [blame] | 1062 | struct page *start_page, struct page *end_page, |
| 1063 | int migratetype) |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1064 | { |
| 1065 | struct page *page; |
| 1066 | unsigned long order; |
Mel Gorman | d100313 | 2007-10-16 01:26:00 -0700 | [diff] [blame] | 1067 | int pages_moved = 0; |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1068 | |
| 1069 | #ifndef CONFIG_HOLES_IN_ZONE |
| 1070 | /* |
| 1071 | * page_zone is not safe to call in this context when |
| 1072 | * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant |
| 1073 | * anyway as we check zone boundaries in move_freepages_block(). |
| 1074 | * Remove at a later date when no bug reports exist related to |
Mel Gorman | ac0e5b7 | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 1075 | * grouping pages by mobility |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1076 | */ |
Mel Gorman | 97ee4ba | 2014-10-09 15:28:28 -0700 | [diff] [blame] | 1077 | VM_BUG_ON(page_zone(start_page) != page_zone(end_page)); |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1078 | #endif |
| 1079 | |
| 1080 | for (page = start_page; page <= end_page;) { |
Adam Litke | 344c790 | 2008-09-02 14:35:38 -0700 | [diff] [blame] | 1081 | /* Make sure we are not inadvertently changing nodes */ |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 1082 | VM_BUG_ON_PAGE(page_to_nid(page) != zone_to_nid(zone), page); |
Adam Litke | 344c790 | 2008-09-02 14:35:38 -0700 | [diff] [blame] | 1083 | |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1084 | if (!pfn_valid_within(page_to_pfn(page))) { |
| 1085 | page++; |
| 1086 | continue; |
| 1087 | } |
| 1088 | |
| 1089 | if (!PageBuddy(page)) { |
| 1090 | page++; |
| 1091 | continue; |
| 1092 | } |
| 1093 | |
| 1094 | order = page_order(page); |
Kirill A. Shutemov | 84be48d | 2011-03-22 16:33:41 -0700 | [diff] [blame] | 1095 | list_move(&page->lru, |
| 1096 | &zone->free_area[order].free_list[migratetype]); |
Minchan Kim | 95e3441 | 2012-10-08 16:32:11 -0700 | [diff] [blame] | 1097 | set_freepage_migratetype(page, migratetype); |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1098 | page += 1 << order; |
Mel Gorman | d100313 | 2007-10-16 01:26:00 -0700 | [diff] [blame] | 1099 | pages_moved += 1 << order; |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1100 | } |
| 1101 | |
Mel Gorman | d100313 | 2007-10-16 01:26:00 -0700 | [diff] [blame] | 1102 | return pages_moved; |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1103 | } |
| 1104 | |
Minchan Kim | ee6f509 | 2012-07-31 16:43:50 -0700 | [diff] [blame] | 1105 | int move_freepages_block(struct zone *zone, struct page *page, |
Linus Torvalds | 68e3e92 | 2012-06-03 20:05:57 -0700 | [diff] [blame] | 1106 | int migratetype) |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1107 | { |
| 1108 | unsigned long start_pfn, end_pfn; |
| 1109 | struct page *start_page, *end_page; |
| 1110 | |
| 1111 | start_pfn = page_to_pfn(page); |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 1112 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1113 | start_page = pfn_to_page(start_pfn); |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 1114 | end_page = start_page + pageblock_nr_pages - 1; |
| 1115 | end_pfn = start_pfn + pageblock_nr_pages - 1; |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1116 | |
| 1117 | /* Do not cross zone boundaries */ |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 1118 | if (!zone_spans_pfn(zone, start_pfn)) |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1119 | start_page = page; |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 1120 | if (!zone_spans_pfn(zone, end_pfn)) |
Mel Gorman | c361be5 | 2007-10-16 01:25:51 -0700 | [diff] [blame] | 1121 | return 0; |
| 1122 | |
| 1123 | return move_freepages(zone, start_page, end_page, migratetype); |
| 1124 | } |
| 1125 | |
Mel Gorman | 2f66a68 | 2009-09-21 17:02:31 -0700 | [diff] [blame] | 1126 | static void change_pageblock_range(struct page *pageblock_page, |
| 1127 | int start_order, int migratetype) |
| 1128 | { |
| 1129 | int nr_pageblocks = 1 << (start_order - pageblock_order); |
| 1130 | |
| 1131 | while (nr_pageblocks--) { |
| 1132 | set_pageblock_migratetype(pageblock_page, migratetype); |
| 1133 | pageblock_page += pageblock_nr_pages; |
| 1134 | } |
| 1135 | } |
| 1136 | |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1137 | /* |
Vlastimil Babka | 9c0415e | 2015-02-11 15:28:21 -0800 | [diff] [blame] | 1138 | * When we are falling back to another migratetype during allocation, try to |
| 1139 | * steal extra free pages from the same pageblocks to satisfy further |
| 1140 | * allocations, instead of polluting multiple pageblocks. |
| 1141 | * |
| 1142 | * If we are stealing a relatively large buddy page, it is likely there will |
| 1143 | * be more free pages in the pageblock, so try to steal them all. For |
| 1144 | * reclaimable and unmovable allocations, we steal regardless of page size, |
| 1145 | * as fragmentation caused by those allocations polluting movable pageblocks |
| 1146 | * is worse than movable allocations stealing from unmovable and reclaimable |
| 1147 | * pageblocks. |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1148 | */ |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1149 | static bool can_steal_fallback(unsigned int order, int start_mt) |
| 1150 | { |
| 1151 | /* |
| 1152 | * Leaving this order check is intended, although there is |
| 1153 | * relaxed order check in next check. The reason is that |
| 1154 | * we can actually steal whole pageblock if this condition met, |
| 1155 | * but, below check doesn't guarantee it and that is just heuristic |
| 1156 | * so could be changed anytime. |
| 1157 | */ |
| 1158 | if (order >= pageblock_order) |
| 1159 | return true; |
| 1160 | |
| 1161 | if (order >= pageblock_order / 2 || |
| 1162 | start_mt == MIGRATE_RECLAIMABLE || |
| 1163 | start_mt == MIGRATE_UNMOVABLE || |
| 1164 | page_group_by_mobility_disabled) |
| 1165 | return true; |
| 1166 | |
| 1167 | return false; |
| 1168 | } |
| 1169 | |
| 1170 | /* |
| 1171 | * This function implements actual steal behaviour. If order is large enough, |
| 1172 | * we can steal whole pageblock. If not, we first move freepages in this |
| 1173 | * pageblock and check whether half of pages are moved or not. If half of |
| 1174 | * pages are moved, we can change migratetype of pageblock and permanently |
| 1175 | * use it's pages as requested migratetype in the future. |
| 1176 | */ |
| 1177 | static void steal_suitable_fallback(struct zone *zone, struct page *page, |
| 1178 | int start_type) |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1179 | { |
| 1180 | int current_order = page_order(page); |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1181 | int pages; |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1182 | |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1183 | /* Take ownership for orders >= pageblock_order */ |
| 1184 | if (current_order >= pageblock_order) { |
| 1185 | change_pageblock_range(page, current_order, start_type); |
Vlastimil Babka | 3a1086f | 2015-02-11 15:28:18 -0800 | [diff] [blame] | 1186 | return; |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1189 | pages = move_freepages_block(zone, page, start_type); |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1190 | |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1191 | /* Claim the whole block if over half of it is free */ |
| 1192 | if (pages >= (1 << (pageblock_order-1)) || |
| 1193 | page_group_by_mobility_disabled) |
| 1194 | set_pageblock_migratetype(page, start_type); |
| 1195 | } |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1196 | |
Joonsoo Kim | 2149cda | 2015-04-14 15:45:21 -0700 | [diff] [blame] | 1197 | /* |
| 1198 | * Check whether there is a suitable fallback freepage with requested order. |
| 1199 | * If only_stealable is true, this function returns fallback_mt only if |
| 1200 | * we can steal other freepages all together. This would help to reduce |
| 1201 | * fragmentation due to mixed migratetype pages in one pageblock. |
| 1202 | */ |
| 1203 | int find_suitable_fallback(struct free_area *area, unsigned int order, |
| 1204 | int migratetype, bool only_stealable, bool *can_steal) |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1205 | { |
| 1206 | int i; |
| 1207 | int fallback_mt; |
| 1208 | |
| 1209 | if (area->nr_free == 0) |
| 1210 | return -1; |
| 1211 | |
| 1212 | *can_steal = false; |
| 1213 | for (i = 0;; i++) { |
| 1214 | fallback_mt = fallbacks[migratetype][i]; |
| 1215 | if (fallback_mt == MIGRATE_RESERVE) |
| 1216 | break; |
| 1217 | |
| 1218 | if (list_empty(&area->free_list[fallback_mt])) |
| 1219 | continue; |
| 1220 | |
| 1221 | if (can_steal_fallback(order, migratetype)) |
| 1222 | *can_steal = true; |
| 1223 | |
Joonsoo Kim | 2149cda | 2015-04-14 15:45:21 -0700 | [diff] [blame] | 1224 | if (!only_stealable) |
| 1225 | return fallback_mt; |
| 1226 | |
| 1227 | if (*can_steal) |
| 1228 | return fallback_mt; |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1229 | } |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1230 | |
| 1231 | return -1; |
Srivatsa S. Bhat | fef903e | 2013-09-11 14:20:35 -0700 | [diff] [blame] | 1232 | } |
| 1233 | |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1234 | /* Remove an element from the buddy allocator from the fallback list */ |
Mel Gorman | 0ac3a40 | 2009-06-16 15:32:06 -0700 | [diff] [blame] | 1235 | static inline struct page * |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1236 | __rmqueue_fallback(struct zone *zone, unsigned int order, int start_migratetype) |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1237 | { |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 1238 | struct free_area *area; |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1239 | unsigned int current_order; |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1240 | struct page *page; |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1241 | int fallback_mt; |
| 1242 | bool can_steal; |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1243 | |
| 1244 | /* Find the largest possible block of pages in the other list */ |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1245 | for (current_order = MAX_ORDER-1; |
| 1246 | current_order >= order && current_order <= MAX_ORDER-1; |
| 1247 | --current_order) { |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1248 | area = &(zone->free_area[current_order]); |
| 1249 | fallback_mt = find_suitable_fallback(area, current_order, |
Joonsoo Kim | 2149cda | 2015-04-14 15:45:21 -0700 | [diff] [blame] | 1250 | start_migratetype, false, &can_steal); |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1251 | if (fallback_mt == -1) |
| 1252 | continue; |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1253 | |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1254 | page = list_entry(area->free_list[fallback_mt].next, |
| 1255 | struct page, lru); |
| 1256 | if (can_steal) |
| 1257 | steal_suitable_fallback(zone, page, start_migratetype); |
Mel Gorman | e010487 | 2007-10-16 01:25:53 -0700 | [diff] [blame] | 1258 | |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1259 | /* Remove the page from the freelists */ |
| 1260 | area->nr_free--; |
| 1261 | list_del(&page->lru); |
| 1262 | rmv_page_order(page); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1263 | |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1264 | expand(zone, page, order, current_order, area, |
| 1265 | start_migratetype); |
| 1266 | /* |
| 1267 | * The freepage_migratetype may differ from pageblock's |
| 1268 | * migratetype depending on the decisions in |
| 1269 | * try_to_steal_freepages(). This is OK as long as it |
| 1270 | * does not differ for MIGRATE_CMA pageblocks. For CMA |
| 1271 | * we need to make sure unallocated pages flushed from |
| 1272 | * pcp lists are returned to the correct freelist. |
| 1273 | */ |
| 1274 | set_freepage_migratetype(page, start_migratetype); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1275 | |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1276 | trace_mm_page_alloc_extfrag(page, order, current_order, |
| 1277 | start_migratetype, fallback_mt); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1278 | |
Joonsoo Kim | 4eb7dce | 2015-04-14 15:45:18 -0700 | [diff] [blame] | 1279 | return page; |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1280 | } |
| 1281 | |
Mel Gorman | 728ec98 | 2009-06-16 15:32:04 -0700 | [diff] [blame] | 1282 | return NULL; |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1283 | } |
| 1284 | |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 1285 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | * Do the hard work of removing an element from the buddy allocator. |
| 1287 | * Call me with the zone->lock already held. |
| 1288 | */ |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1289 | static struct page *__rmqueue(struct zone *zone, unsigned int order, |
| 1290 | int migratetype) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | struct page *page; |
| 1293 | |
Mel Gorman | 728ec98 | 2009-06-16 15:32:04 -0700 | [diff] [blame] | 1294 | retry_reserve: |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 1295 | page = __rmqueue_smallest(zone, order, migratetype); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | |
Mel Gorman | 728ec98 | 2009-06-16 15:32:04 -0700 | [diff] [blame] | 1297 | if (unlikely(!page) && migratetype != MIGRATE_RESERVE) { |
Joonsoo Kim | dc67647 | 2015-04-14 15:45:15 -0700 | [diff] [blame] | 1298 | if (migratetype == MIGRATE_MOVABLE) |
| 1299 | page = __rmqueue_cma_fallback(zone, order); |
| 1300 | |
| 1301 | if (!page) |
| 1302 | page = __rmqueue_fallback(zone, order, migratetype); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1303 | |
Mel Gorman | 728ec98 | 2009-06-16 15:32:04 -0700 | [diff] [blame] | 1304 | /* |
| 1305 | * Use MIGRATE_RESERVE rather than fail an allocation. goto |
| 1306 | * is used because __rmqueue_smallest is an inline function |
| 1307 | * and we want just one call site |
| 1308 | */ |
| 1309 | if (!page) { |
| 1310 | migratetype = MIGRATE_RESERVE; |
| 1311 | goto retry_reserve; |
| 1312 | } |
| 1313 | } |
| 1314 | |
Mel Gorman | 0d3d062 | 2009-09-21 17:02:44 -0700 | [diff] [blame] | 1315 | trace_mm_page_alloc_zone_locked(page, order, migratetype); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1316 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | } |
| 1318 | |
Michal Nazarewicz | 5f63b72 | 2012-01-11 15:16:11 +0100 | [diff] [blame] | 1319 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | * Obtain a specified number of elements from the buddy allocator, all under |
| 1321 | * a single hold of the lock, for efficiency. Add them to the supplied list. |
| 1322 | * Returns the number of new pages which were placed at *list. |
| 1323 | */ |
Michal Nazarewicz | 5f63b72 | 2012-01-11 15:16:11 +0100 | [diff] [blame] | 1324 | static int rmqueue_bulk(struct zone *zone, unsigned int order, |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1325 | unsigned long count, struct list_head *list, |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1326 | int migratetype, bool cold) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | { |
Vlastimil Babka | 5bcc9f8 | 2014-06-04 16:07:22 -0700 | [diff] [blame] | 1328 | int i; |
Michal Nazarewicz | 5f63b72 | 2012-01-11 15:16:11 +0100 | [diff] [blame] | 1329 | |
Nick Piggin | c54ad30 | 2006-01-06 00:10:56 -0800 | [diff] [blame] | 1330 | spin_lock(&zone->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | for (i = 0; i < count; ++i) { |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1332 | struct page *page = __rmqueue(zone, order, migratetype); |
Nick Piggin | 085cc7d | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 1333 | if (unlikely(page == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | break; |
Mel Gorman | 81eabcb | 2007-12-17 16:20:05 -0800 | [diff] [blame] | 1335 | |
| 1336 | /* |
| 1337 | * Split buddy pages returned by expand() are received here |
| 1338 | * in physical page order. The page is added to the callers and |
| 1339 | * list and the list head then moves forward. From the callers |
| 1340 | * perspective, the linked list is ordered by page number in |
| 1341 | * some conditions. This is useful for IO devices that can |
| 1342 | * merge IO requests if the physical pages are ordered |
| 1343 | * properly. |
| 1344 | */ |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1345 | if (likely(!cold)) |
Mel Gorman | e084b2d | 2009-07-29 15:02:04 -0700 | [diff] [blame] | 1346 | list_add(&page->lru, list); |
| 1347 | else |
| 1348 | list_add_tail(&page->lru, list); |
Mel Gorman | 81eabcb | 2007-12-17 16:20:05 -0800 | [diff] [blame] | 1349 | list = &page->lru; |
Vlastimil Babka | 5bcc9f8 | 2014-06-04 16:07:22 -0700 | [diff] [blame] | 1350 | if (is_migrate_cma(get_freepage_migratetype(page))) |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 1351 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, |
| 1352 | -(1 << order)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | } |
Mel Gorman | f2260e6 | 2009-06-16 15:32:13 -0700 | [diff] [blame] | 1354 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); |
Nick Piggin | c54ad30 | 2006-01-06 00:10:56 -0800 | [diff] [blame] | 1355 | spin_unlock(&zone->lock); |
Nick Piggin | 085cc7d | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 1356 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | } |
| 1358 | |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 1359 | #ifdef CONFIG_NUMA |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 1360 | /* |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 1361 | * Called from the vmstat counter updater to drain pagesets of this |
| 1362 | * currently executing processor on remote nodes after they have |
| 1363 | * expired. |
| 1364 | * |
Christoph Lameter | 879336c | 2006-03-22 00:09:08 -0800 | [diff] [blame] | 1365 | * Note that this function must be called with the thread pinned to |
| 1366 | * a single processor. |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 1367 | */ |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 1368 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 1369 | { |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 1370 | unsigned long flags; |
Michal Nazarewicz | 7be12fc | 2014-08-06 16:05:15 -0700 | [diff] [blame] | 1371 | int to_drain, batch; |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 1372 | |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 1373 | local_irq_save(flags); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 1374 | batch = READ_ONCE(pcp->batch); |
Michal Nazarewicz | 7be12fc | 2014-08-06 16:05:15 -0700 | [diff] [blame] | 1375 | to_drain = min(pcp->count, batch); |
KOSAKI Motohiro | 2a13515 | 2012-07-31 16:42:53 -0700 | [diff] [blame] | 1376 | if (to_drain > 0) { |
| 1377 | free_pcppages_bulk(zone, to_drain, pcp); |
| 1378 | pcp->count -= to_drain; |
| 1379 | } |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 1380 | local_irq_restore(flags); |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 1381 | } |
| 1382 | #endif |
| 1383 | |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1384 | /* |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1385 | * Drain pcplists of the indicated processor and zone. |
| 1386 | * |
| 1387 | * The processor must either be the current processor and the |
| 1388 | * thread pinned to the current processor or a processor that |
| 1389 | * is not online. |
| 1390 | */ |
| 1391 | static void drain_pages_zone(unsigned int cpu, struct zone *zone) |
| 1392 | { |
| 1393 | unsigned long flags; |
| 1394 | struct per_cpu_pageset *pset; |
| 1395 | struct per_cpu_pages *pcp; |
| 1396 | |
| 1397 | local_irq_save(flags); |
| 1398 | pset = per_cpu_ptr(zone->pageset, cpu); |
| 1399 | |
| 1400 | pcp = &pset->pcp; |
| 1401 | if (pcp->count) { |
| 1402 | free_pcppages_bulk(zone, pcp->count, pcp); |
| 1403 | pcp->count = 0; |
| 1404 | } |
| 1405 | local_irq_restore(flags); |
| 1406 | } |
| 1407 | |
| 1408 | /* |
| 1409 | * Drain pcplists of all zones on the indicated processor. |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1410 | * |
| 1411 | * The processor must either be the current processor and the |
| 1412 | * thread pinned to the current processor or a processor that |
| 1413 | * is not online. |
| 1414 | */ |
| 1415 | static void drain_pages(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | { |
| 1417 | struct zone *zone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 1419 | for_each_populated_zone(zone) { |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1420 | drain_pages_zone(cpu, zone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | } |
| 1422 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1424 | /* |
| 1425 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1426 | * |
| 1427 | * The CPU has to be pinned. When zone parameter is non-NULL, spill just |
| 1428 | * the single zone's pages. |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1429 | */ |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1430 | void drain_local_pages(struct zone *zone) |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1431 | { |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1432 | int cpu = smp_processor_id(); |
| 1433 | |
| 1434 | if (zone) |
| 1435 | drain_pages_zone(cpu, zone); |
| 1436 | else |
| 1437 | drain_pages(cpu); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1438 | } |
| 1439 | |
| 1440 | /* |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1441 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator. |
| 1442 | * |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1443 | * When zone parameter is non-NULL, spill just the single zone's pages. |
| 1444 | * |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1445 | * Note that this code is protected against sending an IPI to an offline |
| 1446 | * CPU but does not guarantee sending an IPI to newly hotplugged CPUs: |
| 1447 | * on_each_cpu_mask() blocks hotplug and won't talk to offlined CPUs but |
| 1448 | * nothing keeps CPUs from showing up after we populated the cpumask and |
| 1449 | * before the call to on_each_cpu_mask(). |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1450 | */ |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1451 | void drain_all_pages(struct zone *zone) |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1452 | { |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1453 | int cpu; |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1454 | |
| 1455 | /* |
| 1456 | * Allocate in the BSS so we wont require allocation in |
| 1457 | * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y |
| 1458 | */ |
| 1459 | static cpumask_t cpus_with_pcps; |
| 1460 | |
| 1461 | /* |
| 1462 | * We don't care about racing with CPU hotplug event |
| 1463 | * as offline notification will cause the notified |
| 1464 | * cpu to drain that CPU pcps and on_each_cpu_mask |
| 1465 | * disables preemption as part of its processing |
| 1466 | */ |
| 1467 | for_each_online_cpu(cpu) { |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1468 | struct per_cpu_pageset *pcp; |
| 1469 | struct zone *z; |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1470 | bool has_pcps = false; |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1471 | |
| 1472 | if (zone) { |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1473 | pcp = per_cpu_ptr(zone->pageset, cpu); |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1474 | if (pcp->pcp.count) |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1475 | has_pcps = true; |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1476 | } else { |
| 1477 | for_each_populated_zone(z) { |
| 1478 | pcp = per_cpu_ptr(z->pageset, cpu); |
| 1479 | if (pcp->pcp.count) { |
| 1480 | has_pcps = true; |
| 1481 | break; |
| 1482 | } |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1483 | } |
| 1484 | } |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1485 | |
Gilad Ben-Yossef | 7404649 | 2012-03-28 14:42:45 -0700 | [diff] [blame] | 1486 | if (has_pcps) |
| 1487 | cpumask_set_cpu(cpu, &cpus_with_pcps); |
| 1488 | else |
| 1489 | cpumask_clear_cpu(cpu, &cpus_with_pcps); |
| 1490 | } |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 1491 | on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages, |
| 1492 | zone, 1); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1493 | } |
| 1494 | |
Rafael J. Wysocki | 296699d | 2007-07-29 23:27:18 +0200 | [diff] [blame] | 1495 | #ifdef CONFIG_HIBERNATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | |
| 1497 | void mark_free_pages(struct zone *zone) |
| 1498 | { |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1499 | unsigned long pfn, max_zone_pfn; |
| 1500 | unsigned long flags; |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1501 | unsigned int order, t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | struct list_head *curr; |
| 1503 | |
Xishi Qiu | 8080fc0 | 2013-09-11 14:21:45 -0700 | [diff] [blame] | 1504 | if (zone_is_empty(zone)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | return; |
| 1506 | |
| 1507 | spin_lock_irqsave(&zone->lock, flags); |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1508 | |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 1509 | max_zone_pfn = zone_end_pfn(zone); |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1510 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
| 1511 | if (pfn_valid(pfn)) { |
| 1512 | struct page *page = pfn_to_page(pfn); |
| 1513 | |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 1514 | if (!swsusp_page_is_forbidden(page)) |
| 1515 | swsusp_unset_page_free(page); |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1516 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1518 | for_each_migratetype_order(order, t) { |
| 1519 | list_for_each(curr, &zone->free_area[order].free_list[t]) { |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1520 | unsigned long i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1522 | pfn = page_to_pfn(list_entry(curr, struct page, lru)); |
| 1523 | for (i = 0; i < (1UL << order); i++) |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 1524 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1525 | } |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1526 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | spin_unlock_irqrestore(&zone->lock, flags); |
| 1528 | } |
Mel Gorman | e2c55dc | 2007-10-16 01:25:50 -0700 | [diff] [blame] | 1529 | #endif /* CONFIG_PM */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | |
| 1531 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | * Free a 0-order page |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1533 | * cold == true ? free a cold page : free a hot page |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | */ |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1535 | void free_hot_cold_page(struct page *page, bool cold) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | { |
| 1537 | struct zone *zone = page_zone(page); |
| 1538 | struct per_cpu_pages *pcp; |
| 1539 | unsigned long flags; |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 1540 | unsigned long pfn = page_to_pfn(page); |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1541 | int migratetype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | |
KOSAKI Motohiro | ec95f53 | 2010-05-24 14:32:38 -0700 | [diff] [blame] | 1543 | if (!free_pages_prepare(page, 0)) |
Hugh Dickins | 689bceb | 2005-11-21 21:32:20 -0800 | [diff] [blame] | 1544 | return; |
| 1545 | |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 1546 | migratetype = get_pfnblock_migratetype(page, pfn); |
Minchan Kim | b12c4ad | 2012-10-08 16:32:08 -0700 | [diff] [blame] | 1547 | set_freepage_migratetype(page, migratetype); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | local_irq_save(flags); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1549 | __count_vm_event(PGFREE); |
Mel Gorman | da456f1 | 2009-06-16 15:32:08 -0700 | [diff] [blame] | 1550 | |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1551 | /* |
| 1552 | * We only track unmovable, reclaimable and movable on pcp lists. |
| 1553 | * Free ISOLATE pages back to the allocator because they are being |
| 1554 | * offlined but treat RESERVE as movable pages so we can get those |
| 1555 | * areas back if necessary. Otherwise, we may have to free |
| 1556 | * excessively into the page allocator |
| 1557 | */ |
| 1558 | if (migratetype >= MIGRATE_PCPTYPES) { |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 1559 | if (unlikely(is_migrate_isolate(migratetype))) { |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 1560 | free_one_page(zone, page, pfn, 0, migratetype); |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1561 | goto out; |
| 1562 | } |
| 1563 | migratetype = MIGRATE_MOVABLE; |
| 1564 | } |
| 1565 | |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 1566 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1567 | if (!cold) |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1568 | list_add(&page->lru, &pcp->lists[migratetype]); |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1569 | else |
| 1570 | list_add_tail(&page->lru, &pcp->lists[migratetype]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | pcp->count++; |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 1572 | if (pcp->count >= pcp->high) { |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 1573 | unsigned long batch = READ_ONCE(pcp->batch); |
Cody P Schafer | 998d39c | 2013-07-03 15:01:32 -0700 | [diff] [blame] | 1574 | free_pcppages_bulk(zone, batch, pcp); |
| 1575 | pcp->count -= batch; |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 1576 | } |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1577 | |
| 1578 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | } |
| 1581 | |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 1582 | /* |
Konstantin Khlebnikov | cc59850 | 2012-01-10 15:07:04 -0800 | [diff] [blame] | 1583 | * Free a list of 0-order pages |
| 1584 | */ |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1585 | void free_hot_cold_page_list(struct list_head *list, bool cold) |
Konstantin Khlebnikov | cc59850 | 2012-01-10 15:07:04 -0800 | [diff] [blame] | 1586 | { |
| 1587 | struct page *page, *next; |
| 1588 | |
| 1589 | list_for_each_entry_safe(page, next, list, lru) { |
Konstantin Khlebnikov | b413d48 | 2012-01-10 15:07:09 -0800 | [diff] [blame] | 1590 | trace_mm_page_free_batched(page, cold); |
Konstantin Khlebnikov | cc59850 | 2012-01-10 15:07:04 -0800 | [diff] [blame] | 1591 | free_hot_cold_page(page, cold); |
| 1592 | } |
| 1593 | } |
| 1594 | |
| 1595 | /* |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 1596 | * split_page takes a non-compound higher-order page, and splits it into |
| 1597 | * n (1<<order) sub-pages: page[0..n] |
| 1598 | * Each sub-page must be freed individually. |
| 1599 | * |
| 1600 | * Note: this is probably too low level an operation for use in drivers. |
| 1601 | * Please consult with lkml before using this in your driver. |
| 1602 | */ |
| 1603 | void split_page(struct page *page, unsigned int order) |
| 1604 | { |
| 1605 | int i; |
| 1606 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 1607 | VM_BUG_ON_PAGE(PageCompound(page), page); |
| 1608 | VM_BUG_ON_PAGE(!page_count(page), page); |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1609 | |
| 1610 | #ifdef CONFIG_KMEMCHECK |
| 1611 | /* |
| 1612 | * Split shadow pages too, because free(page[0]) would |
| 1613 | * otherwise free the whole shadow. |
| 1614 | */ |
| 1615 | if (kmemcheck_page_is_tracked(page)) |
| 1616 | split_page(virt_to_page(page[0].shadow), order); |
| 1617 | #endif |
| 1618 | |
Joonsoo Kim | 48c96a3 | 2014-12-12 16:56:01 -0800 | [diff] [blame] | 1619 | set_page_owner(page, 0, 0); |
| 1620 | for (i = 1; i < (1 << order); i++) { |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 1621 | set_page_refcounted(page + i); |
Joonsoo Kim | 48c96a3 | 2014-12-12 16:56:01 -0800 | [diff] [blame] | 1622 | set_page_owner(page + i, 0, 0); |
| 1623 | } |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 1624 | } |
K. Y. Srinivasan | 5853ff2 | 2013-03-25 15:47:38 -0700 | [diff] [blame] | 1625 | EXPORT_SYMBOL_GPL(split_page); |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 1626 | |
Joonsoo Kim | 3c60509 | 2014-11-13 15:19:21 -0800 | [diff] [blame] | 1627 | int __isolate_free_page(struct page *page, unsigned int order) |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1628 | { |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1629 | unsigned long watermark; |
| 1630 | struct zone *zone; |
Bartlomiej Zolnierkiewicz | 2139cbe | 2012-10-08 16:32:00 -0700 | [diff] [blame] | 1631 | int mt; |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1632 | |
| 1633 | BUG_ON(!PageBuddy(page)); |
| 1634 | |
| 1635 | zone = page_zone(page); |
Marek Szyprowski | 2e30abd | 2012-12-11 16:02:57 -0800 | [diff] [blame] | 1636 | mt = get_pageblock_migratetype(page); |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1637 | |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 1638 | if (!is_migrate_isolate(mt)) { |
Marek Szyprowski | 2e30abd | 2012-12-11 16:02:57 -0800 | [diff] [blame] | 1639 | /* Obey watermarks as if the page was being allocated */ |
| 1640 | watermark = low_wmark_pages(zone) + (1 << order); |
| 1641 | if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) |
| 1642 | return 0; |
| 1643 | |
Mel Gorman | 8fb74b9 | 2013-01-11 14:32:16 -0800 | [diff] [blame] | 1644 | __mod_zone_freepage_state(zone, -(1UL << order), mt); |
Marek Szyprowski | 2e30abd | 2012-12-11 16:02:57 -0800 | [diff] [blame] | 1645 | } |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1646 | |
| 1647 | /* Remove page from free list */ |
| 1648 | list_del(&page->lru); |
| 1649 | zone->free_area[order].nr_free--; |
| 1650 | rmv_page_order(page); |
Bartlomiej Zolnierkiewicz | 2139cbe | 2012-10-08 16:32:00 -0700 | [diff] [blame] | 1651 | |
Mel Gorman | 8fb74b9 | 2013-01-11 14:32:16 -0800 | [diff] [blame] | 1652 | /* Set the pageblock if the isolated page is at least a pageblock */ |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1653 | if (order >= pageblock_order - 1) { |
| 1654 | struct page *endpage = page + (1 << order) - 1; |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 1655 | for (; page < endpage; page += pageblock_nr_pages) { |
| 1656 | int mt = get_pageblock_migratetype(page); |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 1657 | if (!is_migrate_isolate(mt) && !is_migrate_cma(mt)) |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 1658 | set_pageblock_migratetype(page, |
| 1659 | MIGRATE_MOVABLE); |
| 1660 | } |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1661 | } |
| 1662 | |
Joonsoo Kim | 48c96a3 | 2014-12-12 16:56:01 -0800 | [diff] [blame] | 1663 | set_page_owner(page, order, 0); |
Mel Gorman | 8fb74b9 | 2013-01-11 14:32:16 -0800 | [diff] [blame] | 1664 | return 1UL << order; |
Mel Gorman | 1fb3f8c | 2012-10-08 16:29:12 -0700 | [diff] [blame] | 1665 | } |
| 1666 | |
| 1667 | /* |
| 1668 | * Similar to split_page except the page is already free. As this is only |
| 1669 | * being used for migration, the migratetype of the block also changes. |
| 1670 | * As this is called with interrupts disabled, the caller is responsible |
| 1671 | * for calling arch_alloc_page() and kernel_map_page() after interrupts |
| 1672 | * are enabled. |
| 1673 | * |
| 1674 | * Note: this is probably too low level an operation for use in drivers. |
| 1675 | * Please consult with lkml before using this in your driver. |
| 1676 | */ |
| 1677 | int split_free_page(struct page *page) |
| 1678 | { |
| 1679 | unsigned int order; |
| 1680 | int nr_pages; |
| 1681 | |
Mel Gorman | 1fb3f8c | 2012-10-08 16:29:12 -0700 | [diff] [blame] | 1682 | order = page_order(page); |
| 1683 | |
Mel Gorman | 8fb74b9 | 2013-01-11 14:32:16 -0800 | [diff] [blame] | 1684 | nr_pages = __isolate_free_page(page, order); |
Mel Gorman | 1fb3f8c | 2012-10-08 16:29:12 -0700 | [diff] [blame] | 1685 | if (!nr_pages) |
| 1686 | return 0; |
| 1687 | |
| 1688 | /* Split into individual pages */ |
| 1689 | set_page_refcounted(page); |
| 1690 | split_page(page, order); |
| 1691 | return nr_pages; |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 1692 | } |
| 1693 | |
| 1694 | /* |
Vlastimil Babka | 7537919 | 2015-02-11 15:25:38 -0800 | [diff] [blame] | 1695 | * Allocate a page from the given zone. Use pcplists for order-0 allocations. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | */ |
Mel Gorman | 0a15c3e | 2009-06-16 15:32:05 -0700 | [diff] [blame] | 1697 | static inline |
| 1698 | struct page *buffered_rmqueue(struct zone *preferred_zone, |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1699 | struct zone *zone, unsigned int order, |
| 1700 | gfp_t gfp_flags, int migratetype) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | { |
| 1702 | unsigned long flags; |
Hugh Dickins | 689bceb | 2005-11-21 21:32:20 -0800 | [diff] [blame] | 1703 | struct page *page; |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 1704 | bool cold = ((gfp_flags & __GFP_COLD) != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | |
Nick Piggin | 48db57f | 2006-01-08 01:00:42 -0800 | [diff] [blame] | 1706 | if (likely(order == 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | struct per_cpu_pages *pcp; |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1708 | struct list_head *list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | local_irq_save(flags); |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 1711 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
| 1712 | list = &pcp->lists[migratetype]; |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1713 | if (list_empty(list)) { |
Mel Gorman | 535131e6 | 2007-10-16 01:25:49 -0700 | [diff] [blame] | 1714 | pcp->count += rmqueue_bulk(zone, 0, |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1715 | pcp->batch, list, |
Mel Gorman | e084b2d | 2009-07-29 15:02:04 -0700 | [diff] [blame] | 1716 | migratetype, cold); |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1717 | if (unlikely(list_empty(list))) |
Shaohua Li | 6fb332f | 2009-09-21 17:01:17 -0700 | [diff] [blame] | 1718 | goto failed; |
Mel Gorman | 535131e6 | 2007-10-16 01:25:49 -0700 | [diff] [blame] | 1719 | } |
Mel Gorman | b92a6ed | 2007-10-16 01:25:50 -0700 | [diff] [blame] | 1720 | |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 1721 | if (cold) |
| 1722 | page = list_entry(list->prev, struct page, lru); |
| 1723 | else |
| 1724 | page = list_entry(list->next, struct page, lru); |
| 1725 | |
Mel Gorman | b92a6ed | 2007-10-16 01:25:50 -0700 | [diff] [blame] | 1726 | list_del(&page->lru); |
| 1727 | pcp->count--; |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 1728 | } else { |
Andrew Morton | dab48da | 2009-06-16 15:32:37 -0700 | [diff] [blame] | 1729 | if (unlikely(gfp_flags & __GFP_NOFAIL)) { |
| 1730 | /* |
| 1731 | * __GFP_NOFAIL is not to be used in new code. |
| 1732 | * |
| 1733 | * All __GFP_NOFAIL callers should be fixed so that they |
| 1734 | * properly detect and handle allocation failures. |
| 1735 | * |
| 1736 | * We most definitely don't want callers attempting to |
Linus Torvalds | 4923abf | 2009-06-24 12:16:49 -0700 | [diff] [blame] | 1737 | * allocate greater than order-1 page units with |
Andrew Morton | dab48da | 2009-06-16 15:32:37 -0700 | [diff] [blame] | 1738 | * __GFP_NOFAIL. |
| 1739 | */ |
Linus Torvalds | 4923abf | 2009-06-24 12:16:49 -0700 | [diff] [blame] | 1740 | WARN_ON_ONCE(order > 1); |
Andrew Morton | dab48da | 2009-06-16 15:32:37 -0700 | [diff] [blame] | 1741 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | spin_lock_irqsave(&zone->lock, flags); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 1743 | page = __rmqueue(zone, order, migratetype); |
Nick Piggin | a74609f | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 1744 | spin_unlock(&zone->lock); |
| 1745 | if (!page) |
| 1746 | goto failed; |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 1747 | __mod_zone_freepage_state(zone, -(1 << order), |
Vlastimil Babka | 5bcc9f8 | 2014-06-04 16:07:22 -0700 | [diff] [blame] | 1748 | get_freepage_migratetype(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | } |
| 1750 | |
Johannes Weiner | 3a02576 | 2014-04-07 15:37:48 -0700 | [diff] [blame] | 1751 | __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order)); |
Johannes Weiner | abe5f97 | 2014-10-02 16:21:10 -0700 | [diff] [blame] | 1752 | if (atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]) <= 0 && |
Johannes Weiner | 5705465 | 2014-10-09 15:28:17 -0700 | [diff] [blame] | 1753 | !test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) |
| 1754 | set_bit(ZONE_FAIR_DEPLETED, &zone->flags); |
Johannes Weiner | 2732936 | 2014-03-03 15:38:41 -0800 | [diff] [blame] | 1755 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1756 | __count_zone_vm_events(PGALLOC, zone, 1 << order); |
Andi Kleen | 78afd56 | 2011-03-22 16:33:12 -0700 | [diff] [blame] | 1757 | zone_statistics(preferred_zone, zone, gfp_flags); |
Nick Piggin | a74609f | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 1758 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 1760 | VM_BUG_ON_PAGE(bad_range(zone, page), page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | return page; |
Nick Piggin | a74609f | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 1762 | |
| 1763 | failed: |
| 1764 | local_irq_restore(flags); |
Nick Piggin | a74609f | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 1765 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | } |
| 1767 | |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1768 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
| 1769 | |
Akinobu Mita | b2588c4 | 2011-07-26 16:09:03 -0700 | [diff] [blame] | 1770 | static struct { |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1771 | struct fault_attr attr; |
| 1772 | |
| 1773 | u32 ignore_gfp_highmem; |
| 1774 | u32 ignore_gfp_wait; |
Akinobu Mita | 5411499 | 2007-07-15 23:40:23 -0700 | [diff] [blame] | 1775 | u32 min_order; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1776 | } fail_page_alloc = { |
| 1777 | .attr = FAULT_ATTR_INITIALIZER, |
Don Mullis | 6b1b60f | 2006-12-08 02:39:53 -0800 | [diff] [blame] | 1778 | .ignore_gfp_wait = 1, |
| 1779 | .ignore_gfp_highmem = 1, |
Akinobu Mita | 5411499 | 2007-07-15 23:40:23 -0700 | [diff] [blame] | 1780 | .min_order = 1, |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1781 | }; |
| 1782 | |
| 1783 | static int __init setup_fail_page_alloc(char *str) |
| 1784 | { |
| 1785 | return setup_fault_attr(&fail_page_alloc.attr, str); |
| 1786 | } |
| 1787 | __setup("fail_page_alloc=", setup_fail_page_alloc); |
| 1788 | |
Gavin Shan | deaf386 | 2012-07-31 16:41:51 -0700 | [diff] [blame] | 1789 | static bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1790 | { |
Akinobu Mita | 5411499 | 2007-07-15 23:40:23 -0700 | [diff] [blame] | 1791 | if (order < fail_page_alloc.min_order) |
Gavin Shan | deaf386 | 2012-07-31 16:41:51 -0700 | [diff] [blame] | 1792 | return false; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1793 | if (gfp_mask & __GFP_NOFAIL) |
Gavin Shan | deaf386 | 2012-07-31 16:41:51 -0700 | [diff] [blame] | 1794 | return false; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1795 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) |
Gavin Shan | deaf386 | 2012-07-31 16:41:51 -0700 | [diff] [blame] | 1796 | return false; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1797 | if (fail_page_alloc.ignore_gfp_wait && (gfp_mask & __GFP_WAIT)) |
Gavin Shan | deaf386 | 2012-07-31 16:41:51 -0700 | [diff] [blame] | 1798 | return false; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1799 | |
| 1800 | return should_fail(&fail_page_alloc.attr, 1 << order); |
| 1801 | } |
| 1802 | |
| 1803 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS |
| 1804 | |
| 1805 | static int __init fail_page_alloc_debugfs(void) |
| 1806 | { |
Al Viro | f4ae40a | 2011-07-24 04:33:43 -0400 | [diff] [blame] | 1807 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1808 | struct dentry *dir; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1809 | |
Akinobu Mita | dd48c08 | 2011-08-03 16:21:01 -0700 | [diff] [blame] | 1810 | dir = fault_create_debugfs_attr("fail_page_alloc", NULL, |
| 1811 | &fail_page_alloc.attr); |
| 1812 | if (IS_ERR(dir)) |
| 1813 | return PTR_ERR(dir); |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1814 | |
Akinobu Mita | b2588c4 | 2011-07-26 16:09:03 -0700 | [diff] [blame] | 1815 | if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, |
| 1816 | &fail_page_alloc.ignore_gfp_wait)) |
| 1817 | goto fail; |
| 1818 | if (!debugfs_create_bool("ignore-gfp-highmem", mode, dir, |
| 1819 | &fail_page_alloc.ignore_gfp_highmem)) |
| 1820 | goto fail; |
| 1821 | if (!debugfs_create_u32("min-order", mode, dir, |
| 1822 | &fail_page_alloc.min_order)) |
| 1823 | goto fail; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1824 | |
Akinobu Mita | b2588c4 | 2011-07-26 16:09:03 -0700 | [diff] [blame] | 1825 | return 0; |
| 1826 | fail: |
Akinobu Mita | dd48c08 | 2011-08-03 16:21:01 -0700 | [diff] [blame] | 1827 | debugfs_remove_recursive(dir); |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1828 | |
Akinobu Mita | b2588c4 | 2011-07-26 16:09:03 -0700 | [diff] [blame] | 1829 | return -ENOMEM; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1830 | } |
| 1831 | |
| 1832 | late_initcall(fail_page_alloc_debugfs); |
| 1833 | |
| 1834 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |
| 1835 | |
| 1836 | #else /* CONFIG_FAIL_PAGE_ALLOC */ |
| 1837 | |
Gavin Shan | deaf386 | 2012-07-31 16:41:51 -0700 | [diff] [blame] | 1838 | static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1839 | { |
Gavin Shan | deaf386 | 2012-07-31 16:41:51 -0700 | [diff] [blame] | 1840 | return false; |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 1841 | } |
| 1842 | |
| 1843 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ |
| 1844 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | /* |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 1846 | * Return true if free pages are above 'mark'. This takes into account the order |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | * of the allocation. |
| 1848 | */ |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1849 | static bool __zone_watermark_ok(struct zone *z, unsigned int order, |
| 1850 | unsigned long mark, int classzone_idx, int alloc_flags, |
| 1851 | long free_pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | { |
Wei Yuan | 26086de | 2014-12-10 15:44:44 -0800 | [diff] [blame] | 1853 | /* free_pages may go negative - that's OK */ |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 1854 | long min = mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | int o; |
Tomasz Stanislawski | 026b081 | 2013-06-12 14:05:02 -0700 | [diff] [blame] | 1856 | long free_cma = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | |
Michal Hocko | df0a6da | 2012-01-10 15:08:02 -0800 | [diff] [blame] | 1858 | free_pages -= (1 << order) - 1; |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 1859 | if (alloc_flags & ALLOC_HIGH) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | min -= min / 2; |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 1861 | if (alloc_flags & ALLOC_HARDER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | min -= min / 4; |
Bartlomiej Zolnierkiewicz | d95ea5d | 2012-10-08 16:32:05 -0700 | [diff] [blame] | 1863 | #ifdef CONFIG_CMA |
| 1864 | /* If allocation can't use CMA areas don't use free CMA pages */ |
| 1865 | if (!(alloc_flags & ALLOC_CMA)) |
Tomasz Stanislawski | 026b081 | 2013-06-12 14:05:02 -0700 | [diff] [blame] | 1866 | free_cma = zone_page_state(z, NR_FREE_CMA_PAGES); |
Bartlomiej Zolnierkiewicz | d95ea5d | 2012-10-08 16:32:05 -0700 | [diff] [blame] | 1867 | #endif |
Tomasz Stanislawski | 026b081 | 2013-06-12 14:05:02 -0700 | [diff] [blame] | 1868 | |
Mel Gorman | 3484b2d | 2014-08-06 16:07:14 -0700 | [diff] [blame] | 1869 | if (free_pages - free_cma <= min + z->lowmem_reserve[classzone_idx]) |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 1870 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | for (o = 0; o < order; o++) { |
| 1872 | /* At the next order, this order's pages become unavailable */ |
| 1873 | free_pages -= z->free_area[o].nr_free << o; |
| 1874 | |
| 1875 | /* Require fewer higher order pages to be free */ |
| 1876 | min >>= 1; |
| 1877 | |
| 1878 | if (free_pages <= min) |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 1879 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | } |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 1881 | return true; |
| 1882 | } |
| 1883 | |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1884 | bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 1885 | int classzone_idx, int alloc_flags) |
| 1886 | { |
| 1887 | return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, |
| 1888 | zone_page_state(z, NR_FREE_PAGES)); |
| 1889 | } |
| 1890 | |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 1891 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
| 1892 | unsigned long mark, int classzone_idx, int alloc_flags) |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 1893 | { |
| 1894 | long free_pages = zone_page_state(z, NR_FREE_PAGES); |
| 1895 | |
| 1896 | if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) |
| 1897 | free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); |
| 1898 | |
| 1899 | return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, |
| 1900 | free_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | } |
| 1902 | |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1903 | #ifdef CONFIG_NUMA |
| 1904 | /* |
| 1905 | * zlc_setup - Setup for "zonelist cache". Uses cached zone data to |
| 1906 | * skip over zones that are not allowed by the cpuset, or that have |
| 1907 | * been recently (in last second) found to be nearly full. See further |
| 1908 | * comments in mmzone.h. Reduces cache footprint of zonelist scans |
Simon Arlott | 183ff22 | 2007-10-20 01:27:18 +0200 | [diff] [blame] | 1909 | * that have to skip over a lot of full or unallowed zones. |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1910 | * |
Zhi Yong Wu | a1aeb65 | 2013-11-12 15:08:29 -0800 | [diff] [blame] | 1911 | * If the zonelist cache is present in the passed zonelist, then |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1912 | * returns a pointer to the allowed node mask (either the current |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 1913 | * tasks mems_allowed, or node_states[N_MEMORY].) |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1914 | * |
| 1915 | * If the zonelist cache is not available for this zonelist, does |
| 1916 | * nothing and returns NULL. |
| 1917 | * |
| 1918 | * If the fullzones BITMAP in the zonelist cache is stale (more than |
| 1919 | * a second since last zap'd) then we zap it out (clear its bits.) |
| 1920 | * |
| 1921 | * We hold off even calling zlc_setup, until after we've checked the |
| 1922 | * first zone in the zonelist, on the theory that most allocations will |
| 1923 | * be satisfied from that first zone, so best to examine that zone as |
| 1924 | * quickly as we can. |
| 1925 | */ |
| 1926 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) |
| 1927 | { |
| 1928 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ |
| 1929 | nodemask_t *allowednodes; /* zonelist_cache approximation */ |
| 1930 | |
| 1931 | zlc = zonelist->zlcache_ptr; |
| 1932 | if (!zlc) |
| 1933 | return NULL; |
| 1934 | |
S.Caglar Onur | f05111f | 2008-04-28 02:12:38 -0700 | [diff] [blame] | 1935 | if (time_after(jiffies, zlc->last_full_zap + HZ)) { |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1936 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); |
| 1937 | zlc->last_full_zap = jiffies; |
| 1938 | } |
| 1939 | |
| 1940 | allowednodes = !in_interrupt() && (alloc_flags & ALLOC_CPUSET) ? |
| 1941 | &cpuset_current_mems_allowed : |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 1942 | &node_states[N_MEMORY]; |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1943 | return allowednodes; |
| 1944 | } |
| 1945 | |
| 1946 | /* |
| 1947 | * Given 'z' scanning a zonelist, run a couple of quick checks to see |
| 1948 | * if it is worth looking at further for free memory: |
| 1949 | * 1) Check that the zone isn't thought to be full (doesn't have its |
| 1950 | * bit set in the zonelist_cache fullzones BITMAP). |
| 1951 | * 2) Check that the zones node (obtained from the zonelist_cache |
| 1952 | * z_to_n[] mapping) is allowed in the passed in allowednodes mask. |
| 1953 | * Return true (non-zero) if zone is worth looking at further, or |
| 1954 | * else return false (zero) if it is not. |
| 1955 | * |
| 1956 | * This check -ignores- the distinction between various watermarks, |
| 1957 | * such as GFP_HIGH, GFP_ATOMIC, PF_MEMALLOC, ... If a zone is |
| 1958 | * found to be full for any variation of these watermarks, it will |
| 1959 | * be considered full for up to one second by all requests, unless |
| 1960 | * we are so low on memory on all allowed nodes that we are forced |
| 1961 | * into the second scan of the zonelist. |
| 1962 | * |
| 1963 | * In the second scan we ignore this zonelist cache and exactly |
| 1964 | * apply the watermarks to all zones, even it is slower to do so. |
| 1965 | * We are low on memory in the second scan, and should leave no stone |
| 1966 | * unturned looking for a free page. |
| 1967 | */ |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1968 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zoneref *z, |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1969 | nodemask_t *allowednodes) |
| 1970 | { |
| 1971 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ |
| 1972 | int i; /* index of *z in zonelist zones */ |
| 1973 | int n; /* node that zone *z is on */ |
| 1974 | |
| 1975 | zlc = zonelist->zlcache_ptr; |
| 1976 | if (!zlc) |
| 1977 | return 1; |
| 1978 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1979 | i = z - zonelist->_zonerefs; |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1980 | n = zlc->z_to_n[i]; |
| 1981 | |
| 1982 | /* This zone is worth trying if it is allowed but not full */ |
| 1983 | return node_isset(n, *allowednodes) && !test_bit(i, zlc->fullzones); |
| 1984 | } |
| 1985 | |
| 1986 | /* |
| 1987 | * Given 'z' scanning a zonelist, set the corresponding bit in |
| 1988 | * zlc->fullzones, so that subsequent attempts to allocate a page |
| 1989 | * from that zone don't waste time re-examining it. |
| 1990 | */ |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1991 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z) |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 1992 | { |
| 1993 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ |
| 1994 | int i; /* index of *z in zonelist zones */ |
| 1995 | |
| 1996 | zlc = zonelist->zlcache_ptr; |
| 1997 | if (!zlc) |
| 1998 | return; |
| 1999 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 2000 | i = z - zonelist->_zonerefs; |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2001 | |
| 2002 | set_bit(i, zlc->fullzones); |
| 2003 | } |
| 2004 | |
Mel Gorman | 76d3fbf | 2011-07-25 17:12:30 -0700 | [diff] [blame] | 2005 | /* |
| 2006 | * clear all zones full, called after direct reclaim makes progress so that |
| 2007 | * a zone that was recently full is not skipped over for up to a second |
| 2008 | */ |
| 2009 | static void zlc_clear_zones_full(struct zonelist *zonelist) |
| 2010 | { |
| 2011 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ |
| 2012 | |
| 2013 | zlc = zonelist->zlcache_ptr; |
| 2014 | if (!zlc) |
| 2015 | return; |
| 2016 | |
| 2017 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); |
| 2018 | } |
| 2019 | |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 2020 | static bool zone_local(struct zone *local_zone, struct zone *zone) |
| 2021 | { |
Johannes Weiner | fff4068 | 2013-12-20 14:54:12 +0000 | [diff] [blame] | 2022 | return local_zone->node == zone->node; |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 2023 | } |
| 2024 | |
David Rientjes | 957f822 | 2012-10-08 16:33:24 -0700 | [diff] [blame] | 2025 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
| 2026 | { |
Mel Gorman | 5f7a75a | 2014-06-04 16:07:15 -0700 | [diff] [blame] | 2027 | return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) < |
| 2028 | RECLAIM_DISTANCE; |
David Rientjes | 957f822 | 2012-10-08 16:33:24 -0700 | [diff] [blame] | 2029 | } |
| 2030 | |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2031 | #else /* CONFIG_NUMA */ |
| 2032 | |
| 2033 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) |
| 2034 | { |
| 2035 | return NULL; |
| 2036 | } |
| 2037 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 2038 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zoneref *z, |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2039 | nodemask_t *allowednodes) |
| 2040 | { |
| 2041 | return 1; |
| 2042 | } |
| 2043 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 2044 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z) |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2045 | { |
| 2046 | } |
Mel Gorman | 76d3fbf | 2011-07-25 17:12:30 -0700 | [diff] [blame] | 2047 | |
| 2048 | static void zlc_clear_zones_full(struct zonelist *zonelist) |
| 2049 | { |
| 2050 | } |
David Rientjes | 957f822 | 2012-10-08 16:33:24 -0700 | [diff] [blame] | 2051 | |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 2052 | static bool zone_local(struct zone *local_zone, struct zone *zone) |
| 2053 | { |
| 2054 | return true; |
| 2055 | } |
| 2056 | |
David Rientjes | 957f822 | 2012-10-08 16:33:24 -0700 | [diff] [blame] | 2057 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
| 2058 | { |
| 2059 | return true; |
| 2060 | } |
| 2061 | |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2062 | #endif /* CONFIG_NUMA */ |
| 2063 | |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2064 | static void reset_alloc_batches(struct zone *preferred_zone) |
| 2065 | { |
| 2066 | struct zone *zone = preferred_zone->zone_pgdat->node_zones; |
| 2067 | |
| 2068 | do { |
| 2069 | mod_zone_page_state(zone, NR_ALLOC_BATCH, |
| 2070 | high_wmark_pages(zone) - low_wmark_pages(zone) - |
| 2071 | atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH])); |
Johannes Weiner | 5705465 | 2014-10-09 15:28:17 -0700 | [diff] [blame] | 2072 | clear_bit(ZONE_FAIR_DEPLETED, &zone->flags); |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2073 | } while (zone++ != preferred_zone); |
| 2074 | } |
| 2075 | |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2076 | /* |
Paul Jackson | 0798e51 | 2006-12-06 20:31:38 -0800 | [diff] [blame] | 2077 | * get_page_from_freelist goes through the zonelist trying to allocate |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2078 | * a page. |
| 2079 | */ |
| 2080 | static struct page * |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2081 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, |
| 2082 | const struct alloc_context *ac) |
Martin Hicks | 753ee72 | 2005-06-21 17:14:41 -0700 | [diff] [blame] | 2083 | { |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2084 | struct zonelist *zonelist = ac->zonelist; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 2085 | struct zoneref *z; |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2086 | struct page *page = NULL; |
Mel Gorman | 5117f45 | 2009-06-16 15:31:59 -0700 | [diff] [blame] | 2087 | struct zone *zone; |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2088 | nodemask_t *allowednodes = NULL;/* zonelist_cache approximation */ |
| 2089 | int zlc_active = 0; /* set if using zonelist_cache */ |
| 2090 | int did_zlc_setup = 0; /* just call zlc_setup() one time */ |
Mel Gorman | a6e21b14 | 2014-06-04 16:10:12 -0700 | [diff] [blame] | 2091 | bool consider_zone_dirty = (alloc_flags & ALLOC_WMARK_LOW) && |
| 2092 | (gfp_mask & __GFP_WRITE); |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2093 | int nr_fair_skipped = 0; |
| 2094 | bool zonelist_rescan; |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 2095 | |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2096 | zonelist_scan: |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2097 | zonelist_rescan = false; |
| 2098 | |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2099 | /* |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2100 | * Scan zonelist, looking for a zone with enough free. |
Vladimir Davydov | 344736f | 2014-10-20 15:50:30 +0400 | [diff] [blame] | 2101 | * See also __cpuset_node_allowed() comment in kernel/cpuset.c. |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2102 | */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2103 | for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->high_zoneidx, |
| 2104 | ac->nodemask) { |
Johannes Weiner | e085dbc | 2013-09-11 14:20:46 -0700 | [diff] [blame] | 2105 | unsigned long mark; |
| 2106 | |
Kirill A. Shutemov | e5adfff | 2012-12-11 16:00:29 -0800 | [diff] [blame] | 2107 | if (IS_ENABLED(CONFIG_NUMA) && zlc_active && |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2108 | !zlc_zone_worth_trying(zonelist, z, allowednodes)) |
| 2109 | continue; |
Mel Gorman | 664eedd | 2014-06-04 16:10:08 -0700 | [diff] [blame] | 2110 | if (cpusets_enabled() && |
| 2111 | (alloc_flags & ALLOC_CPUSET) && |
Vladimir Davydov | 344736f | 2014-10-20 15:50:30 +0400 | [diff] [blame] | 2112 | !cpuset_zone_allowed(zone, gfp_mask)) |
Mel Gorman | cd38b11 | 2011-07-25 17:12:29 -0700 | [diff] [blame] | 2113 | continue; |
Johannes Weiner | a756cf5 | 2012-01-10 15:07:49 -0800 | [diff] [blame] | 2114 | /* |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 2115 | * Distribute pages in proportion to the individual |
| 2116 | * zone size to ensure fair page aging. The zone a |
| 2117 | * page was allocated in should have no effect on the |
| 2118 | * time the page has in memory before being reclaimed. |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 2119 | */ |
Johannes Weiner | 3a02576 | 2014-04-07 15:37:48 -0700 | [diff] [blame] | 2120 | if (alloc_flags & ALLOC_FAIR) { |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2121 | if (!zone_local(ac->preferred_zone, zone)) |
Mel Gorman | f7b5d64 | 2014-08-06 16:07:20 -0700 | [diff] [blame] | 2122 | break; |
Johannes Weiner | 5705465 | 2014-10-09 15:28:17 -0700 | [diff] [blame] | 2123 | if (test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) { |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2124 | nr_fair_skipped++; |
Johannes Weiner | 3a02576 | 2014-04-07 15:37:48 -0700 | [diff] [blame] | 2125 | continue; |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2126 | } |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 2127 | } |
| 2128 | /* |
Johannes Weiner | a756cf5 | 2012-01-10 15:07:49 -0800 | [diff] [blame] | 2129 | * When allocating a page cache page for writing, we |
| 2130 | * want to get it from a zone that is within its dirty |
| 2131 | * limit, such that no single zone holds more than its |
| 2132 | * proportional share of globally allowed dirty pages. |
| 2133 | * The dirty limits take into account the zone's |
| 2134 | * lowmem reserves and high watermark so that kswapd |
| 2135 | * should be able to balance it without having to |
| 2136 | * write pages from its LRU list. |
| 2137 | * |
| 2138 | * This may look like it could increase pressure on |
| 2139 | * lower zones by failing allocations in higher zones |
| 2140 | * before they are full. But the pages that do spill |
| 2141 | * over are limited as the lower zones are protected |
| 2142 | * by this very same mechanism. It should not become |
| 2143 | * a practical burden to them. |
| 2144 | * |
| 2145 | * XXX: For now, allow allocations to potentially |
| 2146 | * exceed the per-zone dirty limit in the slowpath |
| 2147 | * (ALLOC_WMARK_LOW unset) before going into reclaim, |
| 2148 | * which is important when on a NUMA setup the allowed |
| 2149 | * zones are together not big enough to reach the |
| 2150 | * global limit. The proper fix for these situations |
| 2151 | * will require awareness of zones in the |
| 2152 | * dirty-throttling and the flusher threads. |
| 2153 | */ |
Mel Gorman | a6e21b14 | 2014-06-04 16:10:12 -0700 | [diff] [blame] | 2154 | if (consider_zone_dirty && !zone_dirty_ok(zone)) |
Mel Gorman | 800a1e7 | 2014-06-04 16:10:06 -0700 | [diff] [blame] | 2155 | continue; |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2156 | |
Johannes Weiner | e085dbc | 2013-09-11 14:20:46 -0700 | [diff] [blame] | 2157 | mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK]; |
| 2158 | if (!zone_watermark_ok(zone, order, mark, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2159 | ac->classzone_idx, alloc_flags)) { |
Mel Gorman | fa5e084 | 2009-06-16 15:33:22 -0700 | [diff] [blame] | 2160 | int ret; |
| 2161 | |
Mel Gorman | 5dab291 | 2014-06-04 16:10:14 -0700 | [diff] [blame] | 2162 | /* Checked here to keep the fast path fast */ |
| 2163 | BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); |
| 2164 | if (alloc_flags & ALLOC_NO_WATERMARKS) |
| 2165 | goto try_this_zone; |
| 2166 | |
Kirill A. Shutemov | e5adfff | 2012-12-11 16:00:29 -0800 | [diff] [blame] | 2167 | if (IS_ENABLED(CONFIG_NUMA) && |
| 2168 | !did_zlc_setup && nr_online_nodes > 1) { |
Mel Gorman | cd38b11 | 2011-07-25 17:12:29 -0700 | [diff] [blame] | 2169 | /* |
| 2170 | * we do zlc_setup if there are multiple nodes |
| 2171 | * and before considering the first zone allowed |
| 2172 | * by the cpuset. |
| 2173 | */ |
| 2174 | allowednodes = zlc_setup(zonelist, alloc_flags); |
| 2175 | zlc_active = 1; |
| 2176 | did_zlc_setup = 1; |
| 2177 | } |
| 2178 | |
David Rientjes | 957f822 | 2012-10-08 16:33:24 -0700 | [diff] [blame] | 2179 | if (zone_reclaim_mode == 0 || |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2180 | !zone_allows_reclaim(ac->preferred_zone, zone)) |
Mel Gorman | fa5e084 | 2009-06-16 15:33:22 -0700 | [diff] [blame] | 2181 | goto this_zone_full; |
| 2182 | |
Mel Gorman | cd38b11 | 2011-07-25 17:12:29 -0700 | [diff] [blame] | 2183 | /* |
| 2184 | * As we may have just activated ZLC, check if the first |
| 2185 | * eligible zone has failed zone_reclaim recently. |
| 2186 | */ |
Kirill A. Shutemov | e5adfff | 2012-12-11 16:00:29 -0800 | [diff] [blame] | 2187 | if (IS_ENABLED(CONFIG_NUMA) && zlc_active && |
Mel Gorman | cd38b11 | 2011-07-25 17:12:29 -0700 | [diff] [blame] | 2188 | !zlc_zone_worth_trying(zonelist, z, allowednodes)) |
| 2189 | continue; |
| 2190 | |
Mel Gorman | fa5e084 | 2009-06-16 15:33:22 -0700 | [diff] [blame] | 2191 | ret = zone_reclaim(zone, gfp_mask, order); |
| 2192 | switch (ret) { |
| 2193 | case ZONE_RECLAIM_NOSCAN: |
| 2194 | /* did not scan */ |
Mel Gorman | cd38b11 | 2011-07-25 17:12:29 -0700 | [diff] [blame] | 2195 | continue; |
Mel Gorman | fa5e084 | 2009-06-16 15:33:22 -0700 | [diff] [blame] | 2196 | case ZONE_RECLAIM_FULL: |
| 2197 | /* scanned but unreclaimable */ |
Mel Gorman | cd38b11 | 2011-07-25 17:12:29 -0700 | [diff] [blame] | 2198 | continue; |
Mel Gorman | fa5e084 | 2009-06-16 15:33:22 -0700 | [diff] [blame] | 2199 | default: |
| 2200 | /* did we reclaim enough */ |
Mel Gorman | fed2719 | 2013-04-29 15:07:57 -0700 | [diff] [blame] | 2201 | if (zone_watermark_ok(zone, order, mark, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2202 | ac->classzone_idx, alloc_flags)) |
Mel Gorman | fed2719 | 2013-04-29 15:07:57 -0700 | [diff] [blame] | 2203 | goto try_this_zone; |
| 2204 | |
| 2205 | /* |
| 2206 | * Failed to reclaim enough to meet watermark. |
| 2207 | * Only mark the zone full if checking the min |
| 2208 | * watermark or if we failed to reclaim just |
| 2209 | * 1<<order pages or else the page allocator |
| 2210 | * fastpath will prematurely mark zones full |
| 2211 | * when the watermark is between the low and |
| 2212 | * min watermarks. |
| 2213 | */ |
| 2214 | if (((alloc_flags & ALLOC_WMARK_MASK) == ALLOC_WMARK_MIN) || |
| 2215 | ret == ZONE_RECLAIM_SOME) |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2216 | goto this_zone_full; |
Mel Gorman | fed2719 | 2013-04-29 15:07:57 -0700 | [diff] [blame] | 2217 | |
| 2218 | continue; |
Paul Jackson | 0798e51 | 2006-12-06 20:31:38 -0800 | [diff] [blame] | 2219 | } |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2220 | } |
| 2221 | |
Mel Gorman | fa5e084 | 2009-06-16 15:33:22 -0700 | [diff] [blame] | 2222 | try_this_zone: |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2223 | page = buffered_rmqueue(ac->preferred_zone, zone, order, |
| 2224 | gfp_mask, ac->migratetype); |
Vlastimil Babka | 7537919 | 2015-02-11 15:25:38 -0800 | [diff] [blame] | 2225 | if (page) { |
| 2226 | if (prep_new_page(page, order, gfp_mask, alloc_flags)) |
| 2227 | goto try_this_zone; |
| 2228 | return page; |
| 2229 | } |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2230 | this_zone_full: |
Mel Gorman | 65bb371 | 2014-06-04 16:10:05 -0700 | [diff] [blame] | 2231 | if (IS_ENABLED(CONFIG_NUMA) && zlc_active) |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2232 | zlc_mark_zone_full(zonelist, z); |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 2233 | } |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 2234 | |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2235 | /* |
| 2236 | * The first pass makes sure allocations are spread fairly within the |
| 2237 | * local node. However, the local node might have free pages left |
| 2238 | * after the fairness batches are exhausted, and remote zones haven't |
| 2239 | * even been considered yet. Try once more without fairness, and |
| 2240 | * include remote zones now, before entering the slowpath and waking |
| 2241 | * kswapd: prefer spilling to a remote zone over swapping locally. |
| 2242 | */ |
| 2243 | if (alloc_flags & ALLOC_FAIR) { |
| 2244 | alloc_flags &= ~ALLOC_FAIR; |
| 2245 | if (nr_fair_skipped) { |
| 2246 | zonelist_rescan = true; |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2247 | reset_alloc_batches(ac->preferred_zone); |
Mel Gorman | 4ffeaf3 | 2014-08-06 16:07:22 -0700 | [diff] [blame] | 2248 | } |
| 2249 | if (nr_online_nodes > 1) |
| 2250 | zonelist_rescan = true; |
| 2251 | } |
| 2252 | |
| 2253 | if (unlikely(IS_ENABLED(CONFIG_NUMA) && zlc_active)) { |
| 2254 | /* Disable zlc cache for second zonelist scan */ |
| 2255 | zlc_active = 0; |
| 2256 | zonelist_rescan = true; |
| 2257 | } |
| 2258 | |
| 2259 | if (zonelist_rescan) |
| 2260 | goto zonelist_scan; |
| 2261 | |
| 2262 | return NULL; |
Martin Hicks | 753ee72 | 2005-06-21 17:14:41 -0700 | [diff] [blame] | 2263 | } |
| 2264 | |
David Rientjes | 29423e77 | 2011-03-22 16:30:47 -0700 | [diff] [blame] | 2265 | /* |
| 2266 | * Large machines with many possible nodes should not always dump per-node |
| 2267 | * meminfo in irq context. |
| 2268 | */ |
| 2269 | static inline bool should_suppress_show_mem(void) |
| 2270 | { |
| 2271 | bool ret = false; |
| 2272 | |
| 2273 | #if NODES_SHIFT > 8 |
| 2274 | ret = in_interrupt(); |
| 2275 | #endif |
| 2276 | return ret; |
| 2277 | } |
| 2278 | |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 2279 | static DEFINE_RATELIMIT_STATE(nopage_rs, |
| 2280 | DEFAULT_RATELIMIT_INTERVAL, |
| 2281 | DEFAULT_RATELIMIT_BURST); |
| 2282 | |
| 2283 | void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...) |
| 2284 | { |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 2285 | unsigned int filter = SHOW_MEM_FILTER_NODES; |
| 2286 | |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 2287 | if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) || |
| 2288 | debug_guardpage_minorder() > 0) |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 2289 | return; |
| 2290 | |
| 2291 | /* |
| 2292 | * This documents exceptions given to allocations in certain |
| 2293 | * contexts that are allowed to allocate outside current's set |
| 2294 | * of allowed nodes. |
| 2295 | */ |
| 2296 | if (!(gfp_mask & __GFP_NOMEMALLOC)) |
| 2297 | if (test_thread_flag(TIF_MEMDIE) || |
| 2298 | (current->flags & (PF_MEMALLOC | PF_EXITING))) |
| 2299 | filter &= ~SHOW_MEM_FILTER_NODES; |
| 2300 | if (in_interrupt() || !(gfp_mask & __GFP_WAIT)) |
| 2301 | filter &= ~SHOW_MEM_FILTER_NODES; |
| 2302 | |
| 2303 | if (fmt) { |
Joe Perches | 3ee9a4f | 2011-10-31 17:08:35 -0700 | [diff] [blame] | 2304 | struct va_format vaf; |
| 2305 | va_list args; |
| 2306 | |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 2307 | va_start(args, fmt); |
Joe Perches | 3ee9a4f | 2011-10-31 17:08:35 -0700 | [diff] [blame] | 2308 | |
| 2309 | vaf.fmt = fmt; |
| 2310 | vaf.va = &args; |
| 2311 | |
| 2312 | pr_warn("%pV", &vaf); |
| 2313 | |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 2314 | va_end(args); |
| 2315 | } |
| 2316 | |
Joe Perches | 3ee9a4f | 2011-10-31 17:08:35 -0700 | [diff] [blame] | 2317 | pr_warn("%s: page allocation failure: order:%d, mode:0x%x\n", |
| 2318 | current->comm, order, gfp_mask); |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 2319 | |
| 2320 | dump_stack(); |
| 2321 | if (!should_suppress_show_mem()) |
| 2322 | show_mem(filter); |
| 2323 | } |
| 2324 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2325 | static inline int |
| 2326 | should_alloc_retry(gfp_t gfp_mask, unsigned int order, |
Mel Gorman | f90ac39 | 2012-01-10 15:07:15 -0800 | [diff] [blame] | 2327 | unsigned long did_some_progress, |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2328 | unsigned long pages_reclaimed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | { |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2330 | /* Do not loop if specifically requested */ |
| 2331 | if (gfp_mask & __GFP_NORETRY) |
| 2332 | return 0; |
| 2333 | |
Mel Gorman | f90ac39 | 2012-01-10 15:07:15 -0800 | [diff] [blame] | 2334 | /* Always retry if specifically requested */ |
| 2335 | if (gfp_mask & __GFP_NOFAIL) |
| 2336 | return 1; |
| 2337 | |
| 2338 | /* |
| 2339 | * Suspend converts GFP_KERNEL to __GFP_WAIT which can prevent reclaim |
| 2340 | * making forward progress without invoking OOM. Suspend also disables |
| 2341 | * storage devices so kswapd will not help. Bail if we are suspending. |
| 2342 | */ |
| 2343 | if (!did_some_progress && pm_suspended_storage()) |
| 2344 | return 0; |
| 2345 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2346 | /* |
| 2347 | * In this implementation, order <= PAGE_ALLOC_COSTLY_ORDER |
| 2348 | * means __GFP_NOFAIL, but that may not be true in other |
| 2349 | * implementations. |
| 2350 | */ |
| 2351 | if (order <= PAGE_ALLOC_COSTLY_ORDER) |
| 2352 | return 1; |
| 2353 | |
| 2354 | /* |
| 2355 | * For order > PAGE_ALLOC_COSTLY_ORDER, if __GFP_REPEAT is |
| 2356 | * specified, then we retry until we no longer reclaim any pages |
| 2357 | * (above), or we've reclaimed an order of pages at least as |
| 2358 | * large as the allocation's order. In both cases, if the |
| 2359 | * allocation still fails, we stop retrying. |
| 2360 | */ |
| 2361 | if (gfp_mask & __GFP_REPEAT && pages_reclaimed < (1 << order)) |
| 2362 | return 1; |
| 2363 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2364 | return 0; |
| 2365 | } |
| 2366 | |
| 2367 | static inline struct page * |
| 2368 | __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2369 | const struct alloc_context *ac, unsigned long *did_some_progress) |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2370 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2373 | *did_some_progress = 0; |
| 2374 | |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2375 | /* |
| 2376 | * Acquire the per-zone oom lock for each zone. If that |
| 2377 | * fails, somebody else is making progress for us. |
| 2378 | */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2379 | if (!oom_zonelist_trylock(ac->zonelist, gfp_mask)) { |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2380 | *did_some_progress = 1; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2381 | schedule_timeout_uninterruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | return NULL; |
| 2383 | } |
Jens Axboe | 6b1de91 | 2005-11-17 21:35:02 +0100 | [diff] [blame] | 2384 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2385 | /* |
| 2386 | * Go through the zonelist yet one more time, keep very high watermark |
| 2387 | * here, this is only to catch a parallel oom killing, we must fail if |
| 2388 | * we're still under heavy pressure. |
| 2389 | */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2390 | page = get_page_from_freelist(gfp_mask | __GFP_HARDWALL, order, |
| 2391 | ALLOC_WMARK_HIGH|ALLOC_CPUSET, ac); |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2392 | if (page) |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2393 | goto out; |
| 2394 | |
KAMEZAWA Hiroyuki | 4365a56 | 2009-12-15 16:45:33 -0800 | [diff] [blame] | 2395 | if (!(gfp_mask & __GFP_NOFAIL)) { |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2396 | /* Coredumps can quickly deplete all memory reserves */ |
| 2397 | if (current->flags & PF_DUMPCORE) |
| 2398 | goto out; |
KAMEZAWA Hiroyuki | 4365a56 | 2009-12-15 16:45:33 -0800 | [diff] [blame] | 2399 | /* The OOM killer will not help higher order allocs */ |
| 2400 | if (order > PAGE_ALLOC_COSTLY_ORDER) |
| 2401 | goto out; |
David Rientjes | 03668b3 | 2010-08-09 17:18:54 -0700 | [diff] [blame] | 2402 | /* The OOM killer does not needlessly kill tasks for lowmem */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2403 | if (ac->high_zoneidx < ZONE_NORMAL) |
David Rientjes | 03668b3 | 2010-08-09 17:18:54 -0700 | [diff] [blame] | 2404 | goto out; |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2405 | /* The OOM killer does not compensate for light reclaim */ |
Johannes Weiner | cc87317 | 2015-02-27 15:52:09 -0800 | [diff] [blame] | 2406 | if (!(gfp_mask & __GFP_FS)) { |
| 2407 | /* |
| 2408 | * XXX: Page reclaim didn't yield anything, |
| 2409 | * and the OOM killer can't be invoked, but |
| 2410 | * keep looping as per should_alloc_retry(). |
| 2411 | */ |
| 2412 | *did_some_progress = 1; |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2413 | goto out; |
Johannes Weiner | cc87317 | 2015-02-27 15:52:09 -0800 | [diff] [blame] | 2414 | } |
David Rientjes | 4167e9b | 2015-04-14 15:46:55 -0700 | [diff] [blame] | 2415 | /* The OOM killer may not free memory on a specific node */ |
KAMEZAWA Hiroyuki | 4365a56 | 2009-12-15 16:45:33 -0800 | [diff] [blame] | 2416 | if (gfp_mask & __GFP_THISNODE) |
| 2417 | goto out; |
| 2418 | } |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2419 | /* Exhausted what can be done so it's blamo time */ |
Michal Hocko | e009d5d | 2015-03-12 16:25:52 -0700 | [diff] [blame] | 2420 | if (out_of_memory(ac->zonelist, gfp_mask, order, ac->nodemask, false) |
| 2421 | || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) |
Michal Hocko | c32b3cb | 2015-02-11 15:26:24 -0800 | [diff] [blame] | 2422 | *did_some_progress = 1; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2423 | out: |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2424 | oom_zonelist_unlock(ac->zonelist, gfp_mask); |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2425 | return page; |
| 2426 | } |
| 2427 | |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2428 | #ifdef CONFIG_COMPACTION |
| 2429 | /* Try memory compaction for high-order allocations before reclaim */ |
| 2430 | static struct page * |
| 2431 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2432 | int alloc_flags, const struct alloc_context *ac, |
| 2433 | enum migrate_mode mode, int *contended_compaction, |
| 2434 | bool *deferred_compaction) |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2435 | { |
Vlastimil Babka | 53853e2 | 2014-10-09 15:27:02 -0700 | [diff] [blame] | 2436 | unsigned long compact_result; |
Vlastimil Babka | 98dd3b4 | 2014-10-09 15:27:04 -0700 | [diff] [blame] | 2437 | struct page *page; |
Vlastimil Babka | 53853e2 | 2014-10-09 15:27:02 -0700 | [diff] [blame] | 2438 | |
Mel Gorman | 6619971 | 2012-01-12 17:19:41 -0800 | [diff] [blame] | 2439 | if (!order) |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2440 | return NULL; |
| 2441 | |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2442 | current->flags |= PF_MEMALLOC; |
Vlastimil Babka | 1a6d53a | 2015-02-11 15:25:44 -0800 | [diff] [blame] | 2443 | compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac, |
| 2444 | mode, contended_compaction); |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2445 | current->flags &= ~PF_MEMALLOC; |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2446 | |
Vlastimil Babka | 98dd3b4 | 2014-10-09 15:27:04 -0700 | [diff] [blame] | 2447 | switch (compact_result) { |
| 2448 | case COMPACT_DEFERRED: |
Vlastimil Babka | 53853e2 | 2014-10-09 15:27:02 -0700 | [diff] [blame] | 2449 | *deferred_compaction = true; |
Vlastimil Babka | 98dd3b4 | 2014-10-09 15:27:04 -0700 | [diff] [blame] | 2450 | /* fall-through */ |
| 2451 | case COMPACT_SKIPPED: |
| 2452 | return NULL; |
| 2453 | default: |
| 2454 | break; |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2455 | } |
| 2456 | |
Vlastimil Babka | 98dd3b4 | 2014-10-09 15:27:04 -0700 | [diff] [blame] | 2457 | /* |
| 2458 | * At least in one zone compaction wasn't deferred or skipped, so let's |
| 2459 | * count a compaction stall |
| 2460 | */ |
| 2461 | count_vm_event(COMPACTSTALL); |
| 2462 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2463 | page = get_page_from_freelist(gfp_mask, order, |
| 2464 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); |
Vlastimil Babka | 98dd3b4 | 2014-10-09 15:27:04 -0700 | [diff] [blame] | 2465 | |
| 2466 | if (page) { |
| 2467 | struct zone *zone = page_zone(page); |
| 2468 | |
| 2469 | zone->compact_blockskip_flush = false; |
| 2470 | compaction_defer_reset(zone, order, true); |
| 2471 | count_vm_event(COMPACTSUCCESS); |
| 2472 | return page; |
| 2473 | } |
| 2474 | |
| 2475 | /* |
Vlastimil Babka | 98dd3b4 | 2014-10-09 15:27:04 -0700 | [diff] [blame] | 2476 | * It's bad if compaction run occurs and fails. The most likely reason |
| 2477 | * is that pages exist, but not enough to satisfy watermarks. |
| 2478 | */ |
| 2479 | count_vm_event(COMPACTFAIL); |
| 2480 | |
| 2481 | cond_resched(); |
| 2482 | |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2483 | return NULL; |
| 2484 | } |
| 2485 | #else |
| 2486 | static inline struct page * |
| 2487 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2488 | int alloc_flags, const struct alloc_context *ac, |
| 2489 | enum migrate_mode mode, int *contended_compaction, |
| 2490 | bool *deferred_compaction) |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2491 | { |
| 2492 | return NULL; |
| 2493 | } |
| 2494 | #endif /* CONFIG_COMPACTION */ |
| 2495 | |
Marek Szyprowski | bba9071 | 2012-01-25 12:09:52 +0100 | [diff] [blame] | 2496 | /* Perform direct synchronous page reclaim */ |
| 2497 | static int |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2498 | __perform_reclaim(gfp_t gfp_mask, unsigned int order, |
| 2499 | const struct alloc_context *ac) |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2500 | { |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2501 | struct reclaim_state reclaim_state; |
Marek Szyprowski | bba9071 | 2012-01-25 12:09:52 +0100 | [diff] [blame] | 2502 | int progress; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2503 | |
| 2504 | cond_resched(); |
| 2505 | |
| 2506 | /* We now go into synchronous reclaim */ |
| 2507 | cpuset_memory_pressure_bump(); |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2508 | current->flags |= PF_MEMALLOC; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2509 | lockdep_set_current_reclaim_state(gfp_mask); |
| 2510 | reclaim_state.reclaimed_slab = 0; |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2511 | current->reclaim_state = &reclaim_state; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2512 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2513 | progress = try_to_free_pages(ac->zonelist, order, gfp_mask, |
| 2514 | ac->nodemask); |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2515 | |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2516 | current->reclaim_state = NULL; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2517 | lockdep_clear_current_reclaim_state(); |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2518 | current->flags &= ~PF_MEMALLOC; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2519 | |
| 2520 | cond_resched(); |
| 2521 | |
Marek Szyprowski | bba9071 | 2012-01-25 12:09:52 +0100 | [diff] [blame] | 2522 | return progress; |
| 2523 | } |
| 2524 | |
| 2525 | /* The really slow allocator path where we enter direct reclaim */ |
| 2526 | static inline struct page * |
| 2527 | __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2528 | int alloc_flags, const struct alloc_context *ac, |
| 2529 | unsigned long *did_some_progress) |
Marek Szyprowski | bba9071 | 2012-01-25 12:09:52 +0100 | [diff] [blame] | 2530 | { |
| 2531 | struct page *page = NULL; |
| 2532 | bool drained = false; |
| 2533 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2534 | *did_some_progress = __perform_reclaim(gfp_mask, order, ac); |
Mel Gorman | 9ee493c | 2010-09-09 16:38:18 -0700 | [diff] [blame] | 2535 | if (unlikely(!(*did_some_progress))) |
| 2536 | return NULL; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2537 | |
Mel Gorman | 76d3fbf | 2011-07-25 17:12:30 -0700 | [diff] [blame] | 2538 | /* After successful reclaim, reconsider all zones for allocation */ |
Kirill A. Shutemov | e5adfff | 2012-12-11 16:00:29 -0800 | [diff] [blame] | 2539 | if (IS_ENABLED(CONFIG_NUMA)) |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2540 | zlc_clear_zones_full(ac->zonelist); |
Mel Gorman | 76d3fbf | 2011-07-25 17:12:30 -0700 | [diff] [blame] | 2541 | |
Mel Gorman | 9ee493c | 2010-09-09 16:38:18 -0700 | [diff] [blame] | 2542 | retry: |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2543 | page = get_page_from_freelist(gfp_mask, order, |
| 2544 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); |
Mel Gorman | 9ee493c | 2010-09-09 16:38:18 -0700 | [diff] [blame] | 2545 | |
| 2546 | /* |
| 2547 | * If an allocation failed after direct reclaim, it could be because |
| 2548 | * pages are pinned on the per-cpu lists. Drain them and try again |
| 2549 | */ |
| 2550 | if (!page && !drained) { |
Vlastimil Babka | 93481ff | 2014-12-10 15:43:01 -0800 | [diff] [blame] | 2551 | drain_all_pages(NULL); |
Mel Gorman | 9ee493c | 2010-09-09 16:38:18 -0700 | [diff] [blame] | 2552 | drained = true; |
| 2553 | goto retry; |
| 2554 | } |
| 2555 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2556 | return page; |
| 2557 | } |
| 2558 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2559 | /* |
| 2560 | * This is called in the allocator slow-path if the allocation request is of |
| 2561 | * sufficient urgency to ignore watermarks and take other desperate measures |
| 2562 | */ |
| 2563 | static inline struct page * |
| 2564 | __alloc_pages_high_priority(gfp_t gfp_mask, unsigned int order, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2565 | const struct alloc_context *ac) |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2566 | { |
| 2567 | struct page *page; |
| 2568 | |
| 2569 | do { |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2570 | page = get_page_from_freelist(gfp_mask, order, |
| 2571 | ALLOC_NO_WATERMARKS, ac); |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2572 | |
| 2573 | if (!page && gfp_mask & __GFP_NOFAIL) |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2574 | wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, |
| 2575 | HZ/50); |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2576 | } while (!page && (gfp_mask & __GFP_NOFAIL)); |
| 2577 | |
| 2578 | return page; |
| 2579 | } |
| 2580 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2581 | static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2582 | { |
| 2583 | struct zoneref *z; |
| 2584 | struct zone *zone; |
| 2585 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2586 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
| 2587 | ac->high_zoneidx, ac->nodemask) |
| 2588 | wakeup_kswapd(zone, order, zone_idx(ac->preferred_zone)); |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2589 | } |
| 2590 | |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2591 | static inline int |
| 2592 | gfp_to_alloc_flags(gfp_t gfp_mask) |
| 2593 | { |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2594 | int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; |
David Rientjes | b104a35 | 2014-07-30 16:08:24 -0700 | [diff] [blame] | 2595 | const bool atomic = !(gfp_mask & (__GFP_WAIT | __GFP_NO_KSWAPD)); |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2596 | |
Mel Gorman | a56f57f | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2597 | /* __GFP_HIGH is assumed to be the same as ALLOC_HIGH to save a branch. */ |
Namhyung Kim | e6223a3 | 2010-10-26 14:21:59 -0700 | [diff] [blame] | 2598 | BUILD_BUG_ON(__GFP_HIGH != (__force gfp_t) ALLOC_HIGH); |
Mel Gorman | a56f57f | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2599 | |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2600 | /* |
| 2601 | * The caller may dip into page reserves a bit more if the caller |
| 2602 | * cannot run direct reclaim, or if the caller has realtime scheduling |
| 2603 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will |
David Rientjes | b104a35 | 2014-07-30 16:08:24 -0700 | [diff] [blame] | 2604 | * set both ALLOC_HARDER (atomic == true) and ALLOC_HIGH (__GFP_HIGH). |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2605 | */ |
Namhyung Kim | e6223a3 | 2010-10-26 14:21:59 -0700 | [diff] [blame] | 2606 | alloc_flags |= (__force int) (gfp_mask & __GFP_HIGH); |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2607 | |
David Rientjes | b104a35 | 2014-07-30 16:08:24 -0700 | [diff] [blame] | 2608 | if (atomic) { |
Andrea Arcangeli | 5c3240d | 2011-01-13 15:46:49 -0800 | [diff] [blame] | 2609 | /* |
David Rientjes | b104a35 | 2014-07-30 16:08:24 -0700 | [diff] [blame] | 2610 | * Not worth trying to allocate harder for __GFP_NOMEMALLOC even |
| 2611 | * if it can't schedule. |
Andrea Arcangeli | 5c3240d | 2011-01-13 15:46:49 -0800 | [diff] [blame] | 2612 | */ |
David Rientjes | b104a35 | 2014-07-30 16:08:24 -0700 | [diff] [blame] | 2613 | if (!(gfp_mask & __GFP_NOMEMALLOC)) |
Andrea Arcangeli | 5c3240d | 2011-01-13 15:46:49 -0800 | [diff] [blame] | 2614 | alloc_flags |= ALLOC_HARDER; |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2615 | /* |
David Rientjes | b104a35 | 2014-07-30 16:08:24 -0700 | [diff] [blame] | 2616 | * Ignore cpuset mems for GFP_ATOMIC rather than fail, see the |
Vladimir Davydov | 344736f | 2014-10-20 15:50:30 +0400 | [diff] [blame] | 2617 | * comment for __cpuset_node_allowed(). |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2618 | */ |
| 2619 | alloc_flags &= ~ALLOC_CPUSET; |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2620 | } else if (unlikely(rt_task(current)) && !in_interrupt()) |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2621 | alloc_flags |= ALLOC_HARDER; |
| 2622 | |
Mel Gorman | b37f1dd | 2012-07-31 16:44:03 -0700 | [diff] [blame] | 2623 | if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) { |
| 2624 | if (gfp_mask & __GFP_MEMALLOC) |
| 2625 | alloc_flags |= ALLOC_NO_WATERMARKS; |
Mel Gorman | 907aed4 | 2012-07-31 16:44:07 -0700 | [diff] [blame] | 2626 | else if (in_serving_softirq() && (current->flags & PF_MEMALLOC)) |
| 2627 | alloc_flags |= ALLOC_NO_WATERMARKS; |
| 2628 | else if (!in_interrupt() && |
| 2629 | ((current->flags & PF_MEMALLOC) || |
| 2630 | unlikely(test_thread_flag(TIF_MEMDIE)))) |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2631 | alloc_flags |= ALLOC_NO_WATERMARKS; |
| 2632 | } |
Bartlomiej Zolnierkiewicz | d95ea5d | 2012-10-08 16:32:05 -0700 | [diff] [blame] | 2633 | #ifdef CONFIG_CMA |
David Rientjes | 43e7a34 | 2014-10-09 15:27:25 -0700 | [diff] [blame] | 2634 | if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE) |
Bartlomiej Zolnierkiewicz | d95ea5d | 2012-10-08 16:32:05 -0700 | [diff] [blame] | 2635 | alloc_flags |= ALLOC_CMA; |
| 2636 | #endif |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2637 | return alloc_flags; |
| 2638 | } |
| 2639 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 2640 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) |
| 2641 | { |
Mel Gorman | b37f1dd | 2012-07-31 16:44:03 -0700 | [diff] [blame] | 2642 | return !!(gfp_to_alloc_flags(gfp_mask) & ALLOC_NO_WATERMARKS); |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 2643 | } |
| 2644 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2645 | static inline struct page * |
| 2646 | __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2647 | struct alloc_context *ac) |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2648 | { |
| 2649 | const gfp_t wait = gfp_mask & __GFP_WAIT; |
| 2650 | struct page *page = NULL; |
| 2651 | int alloc_flags; |
| 2652 | unsigned long pages_reclaimed = 0; |
| 2653 | unsigned long did_some_progress; |
David Rientjes | e0b9dae | 2014-06-04 16:08:28 -0700 | [diff] [blame] | 2654 | enum migrate_mode migration_mode = MIGRATE_ASYNC; |
Mel Gorman | 6619971 | 2012-01-12 17:19:41 -0800 | [diff] [blame] | 2655 | bool deferred_compaction = false; |
Vlastimil Babka | 1f9efde | 2014-10-09 15:27:14 -0700 | [diff] [blame] | 2656 | int contended_compaction = COMPACT_CONTENDED_NONE; |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2657 | |
Christoph Lameter | 952f3b5 | 2006-12-06 20:33:26 -0800 | [diff] [blame] | 2658 | /* |
Mel Gorman | 72807a7 | 2009-06-16 15:32:18 -0700 | [diff] [blame] | 2659 | * In the slowpath, we sanity check order to avoid ever trying to |
| 2660 | * reclaim >= MAX_ORDER areas which will never succeed. Callers may |
| 2661 | * be using allocators in order of preference for an area that is |
| 2662 | * too large. |
| 2663 | */ |
Mel Gorman | 1fc28b7 | 2009-07-29 15:04:08 -0700 | [diff] [blame] | 2664 | if (order >= MAX_ORDER) { |
| 2665 | WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN)); |
Mel Gorman | 72807a7 | 2009-06-16 15:32:18 -0700 | [diff] [blame] | 2666 | return NULL; |
Mel Gorman | 1fc28b7 | 2009-07-29 15:04:08 -0700 | [diff] [blame] | 2667 | } |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2668 | |
Christoph Lameter | 952f3b5 | 2006-12-06 20:33:26 -0800 | [diff] [blame] | 2669 | /* |
David Rientjes | 4167e9b | 2015-04-14 15:46:55 -0700 | [diff] [blame] | 2670 | * If this allocation cannot block and it is for a specific node, then |
| 2671 | * fail early. There's no need to wakeup kswapd or retry for a |
| 2672 | * speculative node-specific allocation. |
Christoph Lameter | 952f3b5 | 2006-12-06 20:33:26 -0800 | [diff] [blame] | 2673 | */ |
David Rientjes | 4167e9b | 2015-04-14 15:46:55 -0700 | [diff] [blame] | 2674 | if (IS_ENABLED(CONFIG_NUMA) && (gfp_mask & __GFP_THISNODE) && !wait) |
Christoph Lameter | 952f3b5 | 2006-12-06 20:33:26 -0800 | [diff] [blame] | 2675 | goto nopage; |
| 2676 | |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2677 | retry: |
Johannes Weiner | 3a02576 | 2014-04-07 15:37:48 -0700 | [diff] [blame] | 2678 | if (!(gfp_mask & __GFP_NO_KSWAPD)) |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2679 | wake_all_kswapds(order, ac); |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2680 | |
Paul Jackson | 9bf2229 | 2005-09-06 15:18:12 -0700 | [diff] [blame] | 2681 | /* |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2682 | * OK, we're below the kswapd watermark and have kicked background |
| 2683 | * reclaim. Now things get more complex, so set up alloc_flags according |
| 2684 | * to how we want to proceed. |
Paul Jackson | 9bf2229 | 2005-09-06 15:18:12 -0700 | [diff] [blame] | 2685 | */ |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2686 | alloc_flags = gfp_to_alloc_flags(gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2687 | |
David Rientjes | f33261d | 2011-01-25 15:07:20 -0800 | [diff] [blame] | 2688 | /* |
| 2689 | * Find the true preferred zone if the allocation is unconstrained by |
| 2690 | * cpusets. |
| 2691 | */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2692 | if (!(alloc_flags & ALLOC_CPUSET) && !ac->nodemask) { |
Mel Gorman | d884637 | 2014-06-04 16:10:33 -0700 | [diff] [blame] | 2693 | struct zoneref *preferred_zoneref; |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2694 | preferred_zoneref = first_zones_zonelist(ac->zonelist, |
| 2695 | ac->high_zoneidx, NULL, &ac->preferred_zone); |
| 2696 | ac->classzone_idx = zonelist_zone_idx(preferred_zoneref); |
Mel Gorman | d884637 | 2014-06-04 16:10:33 -0700 | [diff] [blame] | 2697 | } |
David Rientjes | f33261d | 2011-01-25 15:07:20 -0800 | [diff] [blame] | 2698 | |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2699 | /* This is the last chance, in general, before the goto nopage. */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2700 | page = get_page_from_freelist(gfp_mask, order, |
| 2701 | alloc_flags & ~ALLOC_NO_WATERMARKS, ac); |
Rohit Seth | 7fb1d9f | 2005-11-13 16:06:43 -0800 | [diff] [blame] | 2702 | if (page) |
| 2703 | goto got_pg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2705 | /* Allocate without watermarks if the context allows */ |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2706 | if (alloc_flags & ALLOC_NO_WATERMARKS) { |
Mel Gorman | 183f637 | 2012-07-31 16:44:12 -0700 | [diff] [blame] | 2707 | /* |
| 2708 | * Ignore mempolicies if ALLOC_NO_WATERMARKS on the grounds |
| 2709 | * the allocation is high priority and these type of |
| 2710 | * allocations are system rather than user orientated |
| 2711 | */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2712 | ac->zonelist = node_zonelist(numa_node_id(), gfp_mask); |
Mel Gorman | 183f637 | 2012-07-31 16:44:12 -0700 | [diff] [blame] | 2713 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2714 | page = __alloc_pages_high_priority(gfp_mask, order, ac); |
| 2715 | |
Mel Gorman | cfd19c5 | 2012-07-31 16:44:10 -0700 | [diff] [blame] | 2716 | if (page) { |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2717 | goto got_pg; |
Mel Gorman | cfd19c5 | 2012-07-31 16:44:10 -0700 | [diff] [blame] | 2718 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2719 | } |
| 2720 | |
| 2721 | /* Atomic allocations - we can't balance anything */ |
David Rientjes | aed0a0e | 2014-01-21 15:51:12 -0800 | [diff] [blame] | 2722 | if (!wait) { |
| 2723 | /* |
| 2724 | * All existing users of the deprecated __GFP_NOFAIL are |
| 2725 | * blockable, so warn of any new users that actually allow this |
| 2726 | * type of allocation to fail. |
| 2727 | */ |
| 2728 | WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2729 | goto nopage; |
David Rientjes | aed0a0e | 2014-01-21 15:51:12 -0800 | [diff] [blame] | 2730 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2731 | |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2732 | /* Avoid recursion of direct reclaim */ |
Andrew Morton | c06b1fc | 2011-01-13 15:47:32 -0800 | [diff] [blame] | 2733 | if (current->flags & PF_MEMALLOC) |
Peter Zijlstra | 341ce06 | 2009-06-16 15:32:02 -0700 | [diff] [blame] | 2734 | goto nopage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | |
David Rientjes | 6583bb6 | 2009-07-29 15:02:06 -0700 | [diff] [blame] | 2736 | /* Avoid allocations with no watermarks from looping endlessly */ |
| 2737 | if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL)) |
| 2738 | goto nopage; |
| 2739 | |
Mel Gorman | 77f1fe6 | 2011-01-13 15:45:57 -0800 | [diff] [blame] | 2740 | /* |
| 2741 | * Try direct compaction. The first pass is asynchronous. Subsequent |
| 2742 | * attempts after direct reclaim are synchronous |
| 2743 | */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2744 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac, |
| 2745 | migration_mode, |
| 2746 | &contended_compaction, |
Vlastimil Babka | 53853e2 | 2014-10-09 15:27:02 -0700 | [diff] [blame] | 2747 | &deferred_compaction); |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 2748 | if (page) |
| 2749 | goto got_pg; |
David Rientjes | 75f3086 | 2014-06-04 16:08:30 -0700 | [diff] [blame] | 2750 | |
Vlastimil Babka | 1f9efde | 2014-10-09 15:27:14 -0700 | [diff] [blame] | 2751 | /* Checks for THP-specific high-order allocations */ |
| 2752 | if ((gfp_mask & GFP_TRANSHUGE) == GFP_TRANSHUGE) { |
| 2753 | /* |
| 2754 | * If compaction is deferred for high-order allocations, it is |
| 2755 | * because sync compaction recently failed. If this is the case |
| 2756 | * and the caller requested a THP allocation, we do not want |
| 2757 | * to heavily disrupt the system, so we fail the allocation |
| 2758 | * instead of entering direct reclaim. |
| 2759 | */ |
| 2760 | if (deferred_compaction) |
| 2761 | goto nopage; |
| 2762 | |
| 2763 | /* |
| 2764 | * In all zones where compaction was attempted (and not |
| 2765 | * deferred or skipped), lock contention has been detected. |
| 2766 | * For THP allocation we do not want to disrupt the others |
| 2767 | * so we fallback to base pages instead. |
| 2768 | */ |
| 2769 | if (contended_compaction == COMPACT_CONTENDED_LOCK) |
| 2770 | goto nopage; |
| 2771 | |
| 2772 | /* |
| 2773 | * If compaction was aborted due to need_resched(), we do not |
| 2774 | * want to further increase allocation latency, unless it is |
| 2775 | * khugepaged trying to collapse. |
| 2776 | */ |
| 2777 | if (contended_compaction == COMPACT_CONTENDED_SCHED |
| 2778 | && !(current->flags & PF_KTHREAD)) |
| 2779 | goto nopage; |
| 2780 | } |
Mel Gorman | 6619971 | 2012-01-12 17:19:41 -0800 | [diff] [blame] | 2781 | |
David Rientjes | 8fe7804 | 2014-08-06 16:07:54 -0700 | [diff] [blame] | 2782 | /* |
| 2783 | * It can become very expensive to allocate transparent hugepages at |
| 2784 | * fault, so use asynchronous memory compaction for THP unless it is |
| 2785 | * khugepaged trying to collapse. |
| 2786 | */ |
| 2787 | if ((gfp_mask & GFP_TRANSHUGE) != GFP_TRANSHUGE || |
| 2788 | (current->flags & PF_KTHREAD)) |
| 2789 | migration_mode = MIGRATE_SYNC_LIGHT; |
| 2790 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2791 | /* Try direct reclaim and then allocating */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2792 | page = __alloc_pages_direct_reclaim(gfp_mask, order, alloc_flags, ac, |
| 2793 | &did_some_progress); |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2794 | if (page) |
| 2795 | goto got_pg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2796 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2797 | /* Check if we should retry the allocation */ |
Nishanth Aravamudan | a41f24e | 2008-04-29 00:58:25 -0700 | [diff] [blame] | 2798 | pages_reclaimed += did_some_progress; |
Mel Gorman | f90ac39 | 2012-01-10 15:07:15 -0800 | [diff] [blame] | 2799 | if (should_alloc_retry(gfp_mask, order, did_some_progress, |
| 2800 | pages_reclaimed)) { |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2801 | /* |
| 2802 | * If we fail to make progress by freeing individual |
| 2803 | * pages, but the allocation wants us to keep going, |
| 2804 | * start OOM killing tasks. |
| 2805 | */ |
| 2806 | if (!did_some_progress) { |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2807 | page = __alloc_pages_may_oom(gfp_mask, order, ac, |
| 2808 | &did_some_progress); |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2809 | if (page) |
| 2810 | goto got_pg; |
| 2811 | if (!did_some_progress) |
| 2812 | goto nopage; |
| 2813 | } |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2814 | /* Wait for some write requests to complete then retry */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2815 | wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, HZ/50); |
Johannes Weiner | 9879de7 | 2015-01-26 12:58:32 -0800 | [diff] [blame] | 2816 | goto retry; |
Mel Gorman | 3e7d344 | 2011-01-13 15:45:56 -0800 | [diff] [blame] | 2817 | } else { |
| 2818 | /* |
| 2819 | * High-order allocations do not necessarily loop after |
| 2820 | * direct reclaim and reclaim/compaction depends on compaction |
| 2821 | * being called after reclaim so call directly if necessary |
| 2822 | */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2823 | page = __alloc_pages_direct_compact(gfp_mask, order, |
| 2824 | alloc_flags, ac, migration_mode, |
| 2825 | &contended_compaction, |
Vlastimil Babka | 53853e2 | 2014-10-09 15:27:02 -0700 | [diff] [blame] | 2826 | &deferred_compaction); |
Mel Gorman | 3e7d344 | 2011-01-13 15:45:56 -0800 | [diff] [blame] | 2827 | if (page) |
| 2828 | goto got_pg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2829 | } |
| 2830 | |
| 2831 | nopage: |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 2832 | warn_alloc_failed(gfp_mask, order, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2833 | got_pg: |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 2834 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2835 | } |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2836 | |
| 2837 | /* |
| 2838 | * This is the 'heart' of the zoned buddy allocator. |
| 2839 | */ |
| 2840 | struct page * |
| 2841 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
| 2842 | struct zonelist *zonelist, nodemask_t *nodemask) |
| 2843 | { |
Mel Gorman | d884637 | 2014-06-04 16:10:33 -0700 | [diff] [blame] | 2844 | struct zoneref *preferred_zoneref; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2845 | struct page *page = NULL; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2846 | unsigned int cpuset_mems_cookie; |
Johannes Weiner | 3a02576 | 2014-04-07 15:37:48 -0700 | [diff] [blame] | 2847 | int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET|ALLOC_FAIR; |
Andrew Morton | 91fbdc0 | 2015-02-11 15:25:04 -0800 | [diff] [blame] | 2848 | gfp_t alloc_mask; /* The gfp_t that was actually used for allocation */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2849 | struct alloc_context ac = { |
| 2850 | .high_zoneidx = gfp_zone(gfp_mask), |
| 2851 | .nodemask = nodemask, |
| 2852 | .migratetype = gfpflags_to_migratetype(gfp_mask), |
| 2853 | }; |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2854 | |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 2855 | gfp_mask &= gfp_allowed_mask; |
| 2856 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2857 | lockdep_trace_alloc(gfp_mask); |
| 2858 | |
| 2859 | might_sleep_if(gfp_mask & __GFP_WAIT); |
| 2860 | |
| 2861 | if (should_fail_alloc_page(gfp_mask, order)) |
| 2862 | return NULL; |
| 2863 | |
| 2864 | /* |
| 2865 | * Check the zones suitable for the gfp_mask contain at least one |
| 2866 | * valid zone. It's possible to have an empty zonelist as a result |
David Rientjes | 4167e9b | 2015-04-14 15:46:55 -0700 | [diff] [blame] | 2867 | * of __GFP_THISNODE and a memoryless node |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2868 | */ |
| 2869 | if (unlikely(!zonelist->_zonerefs->zone)) |
| 2870 | return NULL; |
| 2871 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2872 | if (IS_ENABLED(CONFIG_CMA) && ac.migratetype == MIGRATE_MOVABLE) |
Vlastimil Babka | 21bb9bd | 2014-10-09 15:26:51 -0700 | [diff] [blame] | 2873 | alloc_flags |= ALLOC_CMA; |
| 2874 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2875 | retry_cpuset: |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 2876 | cpuset_mems_cookie = read_mems_allowed_begin(); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2877 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2878 | /* We set it here, as __alloc_pages_slowpath might have changed it */ |
| 2879 | ac.zonelist = zonelist; |
Mel Gorman | 5117f45 | 2009-06-16 15:31:59 -0700 | [diff] [blame] | 2880 | /* The preferred zone is used for statistics later */ |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2881 | preferred_zoneref = first_zones_zonelist(ac.zonelist, ac.high_zoneidx, |
| 2882 | ac.nodemask ? : &cpuset_current_mems_allowed, |
| 2883 | &ac.preferred_zone); |
| 2884 | if (!ac.preferred_zone) |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2885 | goto out; |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2886 | ac.classzone_idx = zonelist_zone_idx(preferred_zoneref); |
Mel Gorman | 5117f45 | 2009-06-16 15:31:59 -0700 | [diff] [blame] | 2887 | |
| 2888 | /* First allocation attempt */ |
Andrew Morton | 91fbdc0 | 2015-02-11 15:25:04 -0800 | [diff] [blame] | 2889 | alloc_mask = gfp_mask|__GFP_HARDWALL; |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2890 | page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac); |
Ming Lei | 21caf2f | 2013-02-22 16:34:08 -0800 | [diff] [blame] | 2891 | if (unlikely(!page)) { |
| 2892 | /* |
| 2893 | * Runtime PM, block IO and its error handling path |
| 2894 | * can deadlock because I/O on the device might not |
| 2895 | * complete. |
| 2896 | */ |
Andrew Morton | 91fbdc0 | 2015-02-11 15:25:04 -0800 | [diff] [blame] | 2897 | alloc_mask = memalloc_noio_flags(gfp_mask); |
| 2898 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2899 | page = __alloc_pages_slowpath(alloc_mask, order, &ac); |
Ming Lei | 21caf2f | 2013-02-22 16:34:08 -0800 | [diff] [blame] | 2900 | } |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2901 | |
Xishi Qiu | 23f086f | 2015-02-11 15:25:07 -0800 | [diff] [blame] | 2902 | if (kmemcheck_enabled && page) |
| 2903 | kmemcheck_pagealloc_alloc(page, order, gfp_mask); |
| 2904 | |
Vlastimil Babka | a926375 | 2015-02-11 15:25:41 -0800 | [diff] [blame] | 2905 | trace_mm_page_alloc(page, order, alloc_mask, ac.migratetype); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2906 | |
| 2907 | out: |
| 2908 | /* |
| 2909 | * When updating a task's mems_allowed, it is possible to race with |
| 2910 | * parallel threads in such a way that an allocation can fail while |
| 2911 | * the mask is being updated. If a page allocation is about to fail, |
| 2912 | * check if the cpuset changed during allocation and if so, retry. |
| 2913 | */ |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 2914 | if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2915 | goto retry_cpuset; |
| 2916 | |
Mel Gorman | 11e33f6 | 2009-06-16 15:31:57 -0700 | [diff] [blame] | 2917 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2918 | } |
Mel Gorman | d239171 | 2009-06-16 15:31:52 -0700 | [diff] [blame] | 2919 | EXPORT_SYMBOL(__alloc_pages_nodemask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2920 | |
| 2921 | /* |
| 2922 | * Common helper functions. |
| 2923 | */ |
Harvey Harrison | 920c7a5 | 2008-02-04 22:29:26 -0800 | [diff] [blame] | 2924 | unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | { |
Akinobu Mita | 945a111 | 2009-09-21 17:01:47 -0700 | [diff] [blame] | 2926 | struct page *page; |
| 2927 | |
| 2928 | /* |
| 2929 | * __get_free_pages() returns a 32-bit address, which cannot represent |
| 2930 | * a highmem page |
| 2931 | */ |
| 2932 | VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); |
| 2933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2934 | page = alloc_pages(gfp_mask, order); |
| 2935 | if (!page) |
| 2936 | return 0; |
| 2937 | return (unsigned long) page_address(page); |
| 2938 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2939 | EXPORT_SYMBOL(__get_free_pages); |
| 2940 | |
Harvey Harrison | 920c7a5 | 2008-02-04 22:29:26 -0800 | [diff] [blame] | 2941 | unsigned long get_zeroed_page(gfp_t gfp_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2942 | { |
Akinobu Mita | 945a111 | 2009-09-21 17:01:47 -0700 | [diff] [blame] | 2943 | return __get_free_pages(gfp_mask | __GFP_ZERO, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2945 | EXPORT_SYMBOL(get_zeroed_page); |
| 2946 | |
Harvey Harrison | 920c7a5 | 2008-02-04 22:29:26 -0800 | [diff] [blame] | 2947 | void __free_pages(struct page *page, unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2948 | { |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 2949 | if (put_page_testzero(page)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2950 | if (order == 0) |
Mel Gorman | b745bc8 | 2014-06-04 16:10:22 -0700 | [diff] [blame] | 2951 | free_hot_cold_page(page, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2952 | else |
| 2953 | __free_pages_ok(page, order); |
| 2954 | } |
| 2955 | } |
| 2956 | |
| 2957 | EXPORT_SYMBOL(__free_pages); |
| 2958 | |
Harvey Harrison | 920c7a5 | 2008-02-04 22:29:26 -0800 | [diff] [blame] | 2959 | void free_pages(unsigned long addr, unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2960 | { |
| 2961 | if (addr != 0) { |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 2962 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2963 | __free_pages(virt_to_page((void *)addr), order); |
| 2964 | } |
| 2965 | } |
| 2966 | |
| 2967 | EXPORT_SYMBOL(free_pages); |
| 2968 | |
Glauber Costa | 6a1a0d3 | 2012-12-18 14:22:00 -0800 | [diff] [blame] | 2969 | /* |
Vladimir Davydov | 5238343 | 2014-06-04 16:06:39 -0700 | [diff] [blame] | 2970 | * alloc_kmem_pages charges newly allocated pages to the kmem resource counter |
| 2971 | * of the current memory cgroup. |
Glauber Costa | 6a1a0d3 | 2012-12-18 14:22:00 -0800 | [diff] [blame] | 2972 | * |
Vladimir Davydov | 5238343 | 2014-06-04 16:06:39 -0700 | [diff] [blame] | 2973 | * It should be used when the caller would like to use kmalloc, but since the |
| 2974 | * allocation is large, it has to fall back to the page allocator. |
Glauber Costa | 6a1a0d3 | 2012-12-18 14:22:00 -0800 | [diff] [blame] | 2975 | */ |
Vladimir Davydov | 5238343 | 2014-06-04 16:06:39 -0700 | [diff] [blame] | 2976 | struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order) |
| 2977 | { |
| 2978 | struct page *page; |
| 2979 | struct mem_cgroup *memcg = NULL; |
| 2980 | |
| 2981 | if (!memcg_kmem_newpage_charge(gfp_mask, &memcg, order)) |
| 2982 | return NULL; |
| 2983 | page = alloc_pages(gfp_mask, order); |
| 2984 | memcg_kmem_commit_charge(page, memcg, order); |
| 2985 | return page; |
| 2986 | } |
| 2987 | |
| 2988 | struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, unsigned int order) |
| 2989 | { |
| 2990 | struct page *page; |
| 2991 | struct mem_cgroup *memcg = NULL; |
| 2992 | |
| 2993 | if (!memcg_kmem_newpage_charge(gfp_mask, &memcg, order)) |
| 2994 | return NULL; |
| 2995 | page = alloc_pages_node(nid, gfp_mask, order); |
| 2996 | memcg_kmem_commit_charge(page, memcg, order); |
| 2997 | return page; |
| 2998 | } |
| 2999 | |
| 3000 | /* |
| 3001 | * __free_kmem_pages and free_kmem_pages will free pages allocated with |
| 3002 | * alloc_kmem_pages. |
| 3003 | */ |
| 3004 | void __free_kmem_pages(struct page *page, unsigned int order) |
Glauber Costa | 6a1a0d3 | 2012-12-18 14:22:00 -0800 | [diff] [blame] | 3005 | { |
| 3006 | memcg_kmem_uncharge_pages(page, order); |
| 3007 | __free_pages(page, order); |
| 3008 | } |
| 3009 | |
Vladimir Davydov | 5238343 | 2014-06-04 16:06:39 -0700 | [diff] [blame] | 3010 | void free_kmem_pages(unsigned long addr, unsigned int order) |
Glauber Costa | 6a1a0d3 | 2012-12-18 14:22:00 -0800 | [diff] [blame] | 3011 | { |
| 3012 | if (addr != 0) { |
| 3013 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
Vladimir Davydov | 5238343 | 2014-06-04 16:06:39 -0700 | [diff] [blame] | 3014 | __free_kmem_pages(virt_to_page((void *)addr), order); |
Glauber Costa | 6a1a0d3 | 2012-12-18 14:22:00 -0800 | [diff] [blame] | 3015 | } |
| 3016 | } |
| 3017 | |
Andi Kleen | ee85c2e | 2011-05-11 15:13:34 -0700 | [diff] [blame] | 3018 | static void *make_alloc_exact(unsigned long addr, unsigned order, size_t size) |
| 3019 | { |
| 3020 | if (addr) { |
| 3021 | unsigned long alloc_end = addr + (PAGE_SIZE << order); |
| 3022 | unsigned long used = addr + PAGE_ALIGN(size); |
| 3023 | |
| 3024 | split_page(virt_to_page((void *)addr), order); |
| 3025 | while (used < alloc_end) { |
| 3026 | free_page(used); |
| 3027 | used += PAGE_SIZE; |
| 3028 | } |
| 3029 | } |
| 3030 | return (void *)addr; |
| 3031 | } |
| 3032 | |
Timur Tabi | 2be0ffe | 2008-07-23 21:28:11 -0700 | [diff] [blame] | 3033 | /** |
| 3034 | * alloc_pages_exact - allocate an exact number physically-contiguous pages. |
| 3035 | * @size: the number of bytes to allocate |
| 3036 | * @gfp_mask: GFP flags for the allocation |
| 3037 | * |
| 3038 | * This function is similar to alloc_pages(), except that it allocates the |
| 3039 | * minimum number of pages to satisfy the request. alloc_pages() can only |
| 3040 | * allocate memory in power-of-two pages. |
| 3041 | * |
| 3042 | * This function is also limited by MAX_ORDER. |
| 3043 | * |
| 3044 | * Memory allocated by this function must be released by free_pages_exact(). |
| 3045 | */ |
| 3046 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask) |
| 3047 | { |
| 3048 | unsigned int order = get_order(size); |
| 3049 | unsigned long addr; |
| 3050 | |
| 3051 | addr = __get_free_pages(gfp_mask, order); |
Andi Kleen | ee85c2e | 2011-05-11 15:13:34 -0700 | [diff] [blame] | 3052 | return make_alloc_exact(addr, order, size); |
Timur Tabi | 2be0ffe | 2008-07-23 21:28:11 -0700 | [diff] [blame] | 3053 | } |
| 3054 | EXPORT_SYMBOL(alloc_pages_exact); |
| 3055 | |
| 3056 | /** |
Andi Kleen | ee85c2e | 2011-05-11 15:13:34 -0700 | [diff] [blame] | 3057 | * alloc_pages_exact_nid - allocate an exact number of physically-contiguous |
| 3058 | * pages on a node. |
Randy Dunlap | b5e6ab5 | 2011-05-16 13:16:54 -0700 | [diff] [blame] | 3059 | * @nid: the preferred node ID where memory should be allocated |
Andi Kleen | ee85c2e | 2011-05-11 15:13:34 -0700 | [diff] [blame] | 3060 | * @size: the number of bytes to allocate |
| 3061 | * @gfp_mask: GFP flags for the allocation |
| 3062 | * |
| 3063 | * Like alloc_pages_exact(), but try to allocate on node nid first before falling |
| 3064 | * back. |
| 3065 | * Note this is not alloc_pages_exact_node() which allocates on a specific node, |
| 3066 | * but is not exact. |
| 3067 | */ |
Fabian Frederick | e193181 | 2014-08-06 16:04:59 -0700 | [diff] [blame] | 3068 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) |
Andi Kleen | ee85c2e | 2011-05-11 15:13:34 -0700 | [diff] [blame] | 3069 | { |
| 3070 | unsigned order = get_order(size); |
| 3071 | struct page *p = alloc_pages_node(nid, gfp_mask, order); |
| 3072 | if (!p) |
| 3073 | return NULL; |
| 3074 | return make_alloc_exact((unsigned long)page_address(p), order, size); |
| 3075 | } |
Andi Kleen | ee85c2e | 2011-05-11 15:13:34 -0700 | [diff] [blame] | 3076 | |
| 3077 | /** |
Timur Tabi | 2be0ffe | 2008-07-23 21:28:11 -0700 | [diff] [blame] | 3078 | * free_pages_exact - release memory allocated via alloc_pages_exact() |
| 3079 | * @virt: the value returned by alloc_pages_exact. |
| 3080 | * @size: size of allocation, same value as passed to alloc_pages_exact(). |
| 3081 | * |
| 3082 | * Release the memory allocated by a previous call to alloc_pages_exact. |
| 3083 | */ |
| 3084 | void free_pages_exact(void *virt, size_t size) |
| 3085 | { |
| 3086 | unsigned long addr = (unsigned long)virt; |
| 3087 | unsigned long end = addr + PAGE_ALIGN(size); |
| 3088 | |
| 3089 | while (addr < end) { |
| 3090 | free_page(addr); |
| 3091 | addr += PAGE_SIZE; |
| 3092 | } |
| 3093 | } |
| 3094 | EXPORT_SYMBOL(free_pages_exact); |
| 3095 | |
Zhang Yanfei | e0fb581 | 2013-02-22 16:35:54 -0800 | [diff] [blame] | 3096 | /** |
| 3097 | * nr_free_zone_pages - count number of pages beyond high watermark |
| 3098 | * @offset: The zone index of the highest zone |
| 3099 | * |
| 3100 | * nr_free_zone_pages() counts the number of counts pages which are beyond the |
| 3101 | * high watermark within all zones at or below a given zone index. For each |
| 3102 | * zone, the number of pages is calculated as: |
Jiang Liu | 834405c | 2013-07-03 15:03:04 -0700 | [diff] [blame] | 3103 | * managed_pages - high_pages |
Zhang Yanfei | e0fb581 | 2013-02-22 16:35:54 -0800 | [diff] [blame] | 3104 | */ |
Zhang Yanfei | ebec386 | 2013-02-22 16:35:43 -0800 | [diff] [blame] | 3105 | static unsigned long nr_free_zone_pages(int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3106 | { |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3107 | struct zoneref *z; |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3108 | struct zone *zone; |
| 3109 | |
Martin J. Bligh | e310fd4 | 2005-07-29 22:59:18 -0700 | [diff] [blame] | 3110 | /* Just pick one node, since fallback list is circular */ |
Zhang Yanfei | ebec386 | 2013-02-22 16:35:43 -0800 | [diff] [blame] | 3111 | unsigned long sum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3112 | |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 3113 | struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3114 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3115 | for_each_zone_zonelist(zone, z, zonelist, offset) { |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 3116 | unsigned long size = zone->managed_pages; |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 3117 | unsigned long high = high_wmark_pages(zone); |
Martin J. Bligh | e310fd4 | 2005-07-29 22:59:18 -0700 | [diff] [blame] | 3118 | if (size > high) |
| 3119 | sum += size - high; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3120 | } |
| 3121 | |
| 3122 | return sum; |
| 3123 | } |
| 3124 | |
Zhang Yanfei | e0fb581 | 2013-02-22 16:35:54 -0800 | [diff] [blame] | 3125 | /** |
| 3126 | * nr_free_buffer_pages - count number of pages beyond high watermark |
| 3127 | * |
| 3128 | * nr_free_buffer_pages() counts the number of pages which are beyond the high |
| 3129 | * watermark within ZONE_DMA and ZONE_NORMAL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3130 | */ |
Zhang Yanfei | ebec386 | 2013-02-22 16:35:43 -0800 | [diff] [blame] | 3131 | unsigned long nr_free_buffer_pages(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | { |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 3133 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3134 | } |
Meelap Shah | c2f1a55 | 2007-07-17 04:04:39 -0700 | [diff] [blame] | 3135 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3136 | |
Zhang Yanfei | e0fb581 | 2013-02-22 16:35:54 -0800 | [diff] [blame] | 3137 | /** |
| 3138 | * nr_free_pagecache_pages - count number of pages beyond high watermark |
| 3139 | * |
| 3140 | * nr_free_pagecache_pages() counts the number of pages which are beyond the |
| 3141 | * high watermark within all zones. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3142 | */ |
Zhang Yanfei | ebec386 | 2013-02-22 16:35:43 -0800 | [diff] [blame] | 3143 | unsigned long nr_free_pagecache_pages(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3144 | { |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 3145 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3146 | } |
Christoph Lameter | 08e0f6a | 2006-09-27 01:50:06 -0700 | [diff] [blame] | 3147 | |
| 3148 | static inline void show_node(struct zone *zone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3149 | { |
Kirill A. Shutemov | e5adfff | 2012-12-11 16:00:29 -0800 | [diff] [blame] | 3150 | if (IS_ENABLED(CONFIG_NUMA)) |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 3151 | printk("Node %d ", zone_to_nid(zone)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3152 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3154 | void si_meminfo(struct sysinfo *val) |
| 3155 | { |
| 3156 | val->totalram = totalram_pages; |
Rafael Aquini | cc7452b | 2014-08-06 16:06:38 -0700 | [diff] [blame] | 3157 | val->sharedram = global_page_state(NR_SHMEM); |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 3158 | val->freeram = global_page_state(NR_FREE_PAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | val->bufferram = nr_blockdev_pages(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3160 | val->totalhigh = totalhigh_pages; |
| 3161 | val->freehigh = nr_free_highpages(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3162 | val->mem_unit = PAGE_SIZE; |
| 3163 | } |
| 3164 | |
| 3165 | EXPORT_SYMBOL(si_meminfo); |
| 3166 | |
| 3167 | #ifdef CONFIG_NUMA |
| 3168 | void si_meminfo_node(struct sysinfo *val, int nid) |
| 3169 | { |
Jiang Liu | cdd91a7 | 2013-07-03 15:03:27 -0700 | [diff] [blame] | 3170 | int zone_type; /* needs to be signed */ |
| 3171 | unsigned long managed_pages = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3172 | pg_data_t *pgdat = NODE_DATA(nid); |
| 3173 | |
Jiang Liu | cdd91a7 | 2013-07-03 15:03:27 -0700 | [diff] [blame] | 3174 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) |
| 3175 | managed_pages += pgdat->node_zones[zone_type].managed_pages; |
| 3176 | val->totalram = managed_pages; |
Rafael Aquini | cc7452b | 2014-08-06 16:06:38 -0700 | [diff] [blame] | 3177 | val->sharedram = node_page_state(nid, NR_SHMEM); |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 3178 | val->freeram = node_page_state(nid, NR_FREE_PAGES); |
Christoph Lameter | 98d2b0e | 2006-09-25 23:31:12 -0700 | [diff] [blame] | 3179 | #ifdef CONFIG_HIGHMEM |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 3180 | val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages; |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 3181 | val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM], |
| 3182 | NR_FREE_PAGES); |
Christoph Lameter | 98d2b0e | 2006-09-25 23:31:12 -0700 | [diff] [blame] | 3183 | #else |
| 3184 | val->totalhigh = 0; |
| 3185 | val->freehigh = 0; |
| 3186 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3187 | val->mem_unit = PAGE_SIZE; |
| 3188 | } |
| 3189 | #endif |
| 3190 | |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3191 | /* |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 3192 | * Determine whether the node should be displayed or not, depending on whether |
| 3193 | * SHOW_MEM_FILTER_NODES was passed to show_free_areas(). |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3194 | */ |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 3195 | bool skip_free_areas_node(unsigned int flags, int nid) |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3196 | { |
| 3197 | bool ret = false; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 3198 | unsigned int cpuset_mems_cookie; |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3199 | |
| 3200 | if (!(flags & SHOW_MEM_FILTER_NODES)) |
| 3201 | goto out; |
| 3202 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 3203 | do { |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 3204 | cpuset_mems_cookie = read_mems_allowed_begin(); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 3205 | ret = !node_isset(nid, cpuset_current_mems_allowed); |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 3206 | } while (read_mems_allowed_retry(cpuset_mems_cookie)); |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3207 | out: |
| 3208 | return ret; |
| 3209 | } |
| 3210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3211 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
| 3212 | |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3213 | static void show_migration_types(unsigned char type) |
| 3214 | { |
| 3215 | static const char types[MIGRATE_TYPES] = { |
| 3216 | [MIGRATE_UNMOVABLE] = 'U', |
| 3217 | [MIGRATE_RECLAIMABLE] = 'E', |
| 3218 | [MIGRATE_MOVABLE] = 'M', |
| 3219 | [MIGRATE_RESERVE] = 'R', |
| 3220 | #ifdef CONFIG_CMA |
| 3221 | [MIGRATE_CMA] = 'C', |
| 3222 | #endif |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 3223 | #ifdef CONFIG_MEMORY_ISOLATION |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3224 | [MIGRATE_ISOLATE] = 'I', |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 3225 | #endif |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3226 | }; |
| 3227 | char tmp[MIGRATE_TYPES + 1]; |
| 3228 | char *p = tmp; |
| 3229 | int i; |
| 3230 | |
| 3231 | for (i = 0; i < MIGRATE_TYPES; i++) { |
| 3232 | if (type & (1 << i)) |
| 3233 | *p++ = types[i]; |
| 3234 | } |
| 3235 | |
| 3236 | *p = '\0'; |
| 3237 | printk("(%s) ", tmp); |
| 3238 | } |
| 3239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3240 | /* |
| 3241 | * Show free area list (used inside shift_scroll-lock stuff) |
| 3242 | * We also calculate the percentage fragmentation. We do this by counting the |
| 3243 | * memory on each free list with the exception of the first item on the list. |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3244 | * |
| 3245 | * Bits in @filter: |
| 3246 | * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's |
| 3247 | * cpuset. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3248 | */ |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 3249 | void show_free_areas(unsigned int filter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3250 | { |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3251 | unsigned long free_pcp = 0; |
Jes Sorensen | c724191 | 2006-09-27 01:50:05 -0700 | [diff] [blame] | 3252 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3253 | struct zone *zone; |
| 3254 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 3255 | for_each_populated_zone(zone) { |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 3256 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3257 | continue; |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3258 | |
Konstantin Khlebnikov | 761b067 | 2015-04-14 15:45:32 -0700 | [diff] [blame] | 3259 | for_each_online_cpu(cpu) |
| 3260 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3261 | } |
| 3262 | |
KOSAKI Motohiro | a731286 | 2009-09-21 17:01:37 -0700 | [diff] [blame] | 3263 | printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" |
| 3264 | " active_file:%lu inactive_file:%lu isolated_file:%lu\n" |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3265 | " unevictable:%lu dirty:%lu writeback:%lu unstable:%lu\n" |
| 3266 | " slab_reclaimable:%lu slab_unreclaimable:%lu\n" |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 3267 | " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n" |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3268 | " free:%lu free_pcp:%lu free_cma:%lu\n", |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 3269 | global_page_state(NR_ACTIVE_ANON), |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 3270 | global_page_state(NR_INACTIVE_ANON), |
KOSAKI Motohiro | a731286 | 2009-09-21 17:01:37 -0700 | [diff] [blame] | 3271 | global_page_state(NR_ISOLATED_ANON), |
| 3272 | global_page_state(NR_ACTIVE_FILE), |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 3273 | global_page_state(NR_INACTIVE_FILE), |
KOSAKI Motohiro | a731286 | 2009-09-21 17:01:37 -0700 | [diff] [blame] | 3274 | global_page_state(NR_ISOLATED_FILE), |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 3275 | global_page_state(NR_UNEVICTABLE), |
Christoph Lameter | b1e7a8f | 2006-06-30 01:55:39 -0700 | [diff] [blame] | 3276 | global_page_state(NR_FILE_DIRTY), |
Christoph Lameter | ce866b3 | 2006-06-30 01:55:40 -0700 | [diff] [blame] | 3277 | global_page_state(NR_WRITEBACK), |
Christoph Lameter | fd39fc8 | 2006-06-30 01:55:40 -0700 | [diff] [blame] | 3278 | global_page_state(NR_UNSTABLE_NFS), |
KOSAKI Motohiro | 3701b03 | 2009-09-21 17:01:29 -0700 | [diff] [blame] | 3279 | global_page_state(NR_SLAB_RECLAIMABLE), |
| 3280 | global_page_state(NR_SLAB_UNRECLAIMABLE), |
Christoph Lameter | 65ba55f | 2006-06-30 01:55:34 -0700 | [diff] [blame] | 3281 | global_page_state(NR_FILE_MAPPED), |
KOSAKI Motohiro | 4b02108 | 2009-09-21 17:01:33 -0700 | [diff] [blame] | 3282 | global_page_state(NR_SHMEM), |
Andrew Morton | a25700a | 2007-02-08 14:20:40 -0800 | [diff] [blame] | 3283 | global_page_state(NR_PAGETABLE), |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 3284 | global_page_state(NR_BOUNCE), |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3285 | global_page_state(NR_FREE_PAGES), |
| 3286 | free_pcp, |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 3287 | global_page_state(NR_FREE_CMA_PAGES)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3288 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 3289 | for_each_populated_zone(zone) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3290 | int i; |
| 3291 | |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 3292 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3293 | continue; |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3294 | |
| 3295 | free_pcp = 0; |
| 3296 | for_each_online_cpu(cpu) |
| 3297 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; |
| 3298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3299 | show_node(zone); |
| 3300 | printk("%s" |
| 3301 | " free:%lukB" |
| 3302 | " min:%lukB" |
| 3303 | " low:%lukB" |
| 3304 | " high:%lukB" |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 3305 | " active_anon:%lukB" |
| 3306 | " inactive_anon:%lukB" |
| 3307 | " active_file:%lukB" |
| 3308 | " inactive_file:%lukB" |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 3309 | " unevictable:%lukB" |
KOSAKI Motohiro | a731286 | 2009-09-21 17:01:37 -0700 | [diff] [blame] | 3310 | " isolated(anon):%lukB" |
| 3311 | " isolated(file):%lukB" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3312 | " present:%lukB" |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 3313 | " managed:%lukB" |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3314 | " mlocked:%lukB" |
| 3315 | " dirty:%lukB" |
| 3316 | " writeback:%lukB" |
| 3317 | " mapped:%lukB" |
KOSAKI Motohiro | 4b02108 | 2009-09-21 17:01:33 -0700 | [diff] [blame] | 3318 | " shmem:%lukB" |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3319 | " slab_reclaimable:%lukB" |
| 3320 | " slab_unreclaimable:%lukB" |
KOSAKI Motohiro | c6a7f57 | 2009-09-21 17:01:32 -0700 | [diff] [blame] | 3321 | " kernel_stack:%lukB" |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3322 | " pagetables:%lukB" |
| 3323 | " unstable:%lukB" |
| 3324 | " bounce:%lukB" |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3325 | " free_pcp:%lukB" |
| 3326 | " local_pcp:%ukB" |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 3327 | " free_cma:%lukB" |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3328 | " writeback_tmp:%lukB" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3329 | " pages_scanned:%lu" |
| 3330 | " all_unreclaimable? %s" |
| 3331 | "\n", |
| 3332 | zone->name, |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 3333 | K(zone_page_state(zone, NR_FREE_PAGES)), |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 3334 | K(min_wmark_pages(zone)), |
| 3335 | K(low_wmark_pages(zone)), |
| 3336 | K(high_wmark_pages(zone)), |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 3337 | K(zone_page_state(zone, NR_ACTIVE_ANON)), |
| 3338 | K(zone_page_state(zone, NR_INACTIVE_ANON)), |
| 3339 | K(zone_page_state(zone, NR_ACTIVE_FILE)), |
| 3340 | K(zone_page_state(zone, NR_INACTIVE_FILE)), |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 3341 | K(zone_page_state(zone, NR_UNEVICTABLE)), |
KOSAKI Motohiro | a731286 | 2009-09-21 17:01:37 -0700 | [diff] [blame] | 3342 | K(zone_page_state(zone, NR_ISOLATED_ANON)), |
| 3343 | K(zone_page_state(zone, NR_ISOLATED_FILE)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3344 | K(zone->present_pages), |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 3345 | K(zone->managed_pages), |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3346 | K(zone_page_state(zone, NR_MLOCK)), |
| 3347 | K(zone_page_state(zone, NR_FILE_DIRTY)), |
| 3348 | K(zone_page_state(zone, NR_WRITEBACK)), |
| 3349 | K(zone_page_state(zone, NR_FILE_MAPPED)), |
KOSAKI Motohiro | 4b02108 | 2009-09-21 17:01:33 -0700 | [diff] [blame] | 3350 | K(zone_page_state(zone, NR_SHMEM)), |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3351 | K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)), |
| 3352 | K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)), |
KOSAKI Motohiro | c6a7f57 | 2009-09-21 17:01:32 -0700 | [diff] [blame] | 3353 | zone_page_state(zone, NR_KERNEL_STACK) * |
| 3354 | THREAD_SIZE / 1024, |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3355 | K(zone_page_state(zone, NR_PAGETABLE)), |
| 3356 | K(zone_page_state(zone, NR_UNSTABLE_NFS)), |
| 3357 | K(zone_page_state(zone, NR_BOUNCE)), |
Konstantin Khlebnikov | d1bfcdb | 2015-04-14 15:45:30 -0700 | [diff] [blame] | 3358 | K(free_pcp), |
| 3359 | K(this_cpu_read(zone->pageset->pcp.count)), |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 3360 | K(zone_page_state(zone, NR_FREE_CMA_PAGES)), |
KOSAKI Motohiro | 4a0aa73 | 2009-09-21 17:01:30 -0700 | [diff] [blame] | 3361 | K(zone_page_state(zone, NR_WRITEBACK_TEMP)), |
Mel Gorman | 0d5d823 | 2014-08-06 16:07:16 -0700 | [diff] [blame] | 3362 | K(zone_page_state(zone, NR_PAGES_SCANNED)), |
Lisa Du | 6e543d5 | 2013-09-11 14:22:36 -0700 | [diff] [blame] | 3363 | (!zone_reclaimable(zone) ? "yes" : "no") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3364 | ); |
| 3365 | printk("lowmem_reserve[]:"); |
| 3366 | for (i = 0; i < MAX_NR_ZONES; i++) |
Mel Gorman | 3484b2d | 2014-08-06 16:07:14 -0700 | [diff] [blame] | 3367 | printk(" %ld", zone->lowmem_reserve[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3368 | printk("\n"); |
| 3369 | } |
| 3370 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 3371 | for_each_populated_zone(zone) { |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 3372 | unsigned long nr[MAX_ORDER], flags, order, total = 0; |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3373 | unsigned char types[MAX_ORDER]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3374 | |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 3375 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 3376 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3377 | show_node(zone); |
| 3378 | printk("%s: ", zone->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3379 | |
| 3380 | spin_lock_irqsave(&zone->lock, flags); |
| 3381 | for (order = 0; order < MAX_ORDER; order++) { |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3382 | struct free_area *area = &zone->free_area[order]; |
| 3383 | int type; |
| 3384 | |
| 3385 | nr[order] = area->nr_free; |
Kirill Korotaev | 8f9de51 | 2006-06-23 02:03:50 -0700 | [diff] [blame] | 3386 | total += nr[order] << order; |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3387 | |
| 3388 | types[order] = 0; |
| 3389 | for (type = 0; type < MIGRATE_TYPES; type++) { |
| 3390 | if (!list_empty(&area->free_list[type])) |
| 3391 | types[order] |= 1 << type; |
| 3392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3393 | } |
| 3394 | spin_unlock_irqrestore(&zone->lock, flags); |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3395 | for (order = 0; order < MAX_ORDER; order++) { |
Kirill Korotaev | 8f9de51 | 2006-06-23 02:03:50 -0700 | [diff] [blame] | 3396 | printk("%lu*%lukB ", nr[order], K(1UL) << order); |
Rabin Vincent | 377e4f1 | 2012-12-11 16:00:24 -0800 | [diff] [blame] | 3397 | if (nr[order]) |
| 3398 | show_migration_types(types[order]); |
| 3399 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3400 | printk("= %lukB\n", K(total)); |
| 3401 | } |
| 3402 | |
David Rientjes | 949f7ec | 2013-04-29 15:07:48 -0700 | [diff] [blame] | 3403 | hugetlb_show_meminfo(); |
| 3404 | |
Larry Woodman | e6f3602 | 2008-02-04 22:29:30 -0800 | [diff] [blame] | 3405 | printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES)); |
| 3406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3407 | show_swap_cache_info(); |
| 3408 | } |
| 3409 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 3410 | static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) |
| 3411 | { |
| 3412 | zoneref->zone = zone; |
| 3413 | zoneref->zone_idx = zone_idx(zone); |
| 3414 | } |
| 3415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3416 | /* |
| 3417 | * Builds allocation fallback zone lists. |
Christoph Lameter | 1a93205 | 2006-01-06 00:11:16 -0800 | [diff] [blame] | 3418 | * |
| 3419 | * Add all populated zones of a node to the zonelist. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3420 | */ |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3421 | static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3422 | int nr_zones) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3423 | { |
Christoph Lameter | 1a93205 | 2006-01-06 00:11:16 -0800 | [diff] [blame] | 3424 | struct zone *zone; |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3425 | enum zone_type zone_type = MAX_NR_ZONES; |
Christoph Lameter | 02a68a5 | 2006-01-06 00:11:18 -0800 | [diff] [blame] | 3426 | |
| 3427 | do { |
Christoph Lameter | 2f6726e | 2006-09-25 23:31:18 -0700 | [diff] [blame] | 3428 | zone_type--; |
Christoph Lameter | 070f803 | 2006-01-06 00:11:19 -0800 | [diff] [blame] | 3429 | zone = pgdat->node_zones + zone_type; |
Christoph Lameter | 1a93205 | 2006-01-06 00:11:16 -0800 | [diff] [blame] | 3430 | if (populated_zone(zone)) { |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3431 | zoneref_set_zone(zone, |
| 3432 | &zonelist->_zonerefs[nr_zones++]); |
Christoph Lameter | 070f803 | 2006-01-06 00:11:19 -0800 | [diff] [blame] | 3433 | check_highest_zone(zone_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3434 | } |
Christoph Lameter | 2f6726e | 2006-09-25 23:31:18 -0700 | [diff] [blame] | 3435 | } while (zone_type); |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3436 | |
Christoph Lameter | 070f803 | 2006-01-06 00:11:19 -0800 | [diff] [blame] | 3437 | return nr_zones; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3438 | } |
| 3439 | |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3440 | |
| 3441 | /* |
| 3442 | * zonelist_order: |
| 3443 | * 0 = automatic detection of better ordering. |
| 3444 | * 1 = order by ([node] distance, -zonetype) |
| 3445 | * 2 = order by (-zonetype, [node] distance) |
| 3446 | * |
| 3447 | * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create |
| 3448 | * the same zonelist. So only NUMA can configure this param. |
| 3449 | */ |
| 3450 | #define ZONELIST_ORDER_DEFAULT 0 |
| 3451 | #define ZONELIST_ORDER_NODE 1 |
| 3452 | #define ZONELIST_ORDER_ZONE 2 |
| 3453 | |
| 3454 | /* zonelist order in the kernel. |
| 3455 | * set_zonelist_order() will set this to NODE or ZONE. |
| 3456 | */ |
| 3457 | static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; |
| 3458 | static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; |
| 3459 | |
| 3460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3461 | #ifdef CONFIG_NUMA |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3462 | /* The value user specified ....changed by config */ |
| 3463 | static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; |
| 3464 | /* string for sysctl */ |
| 3465 | #define NUMA_ZONELIST_ORDER_LEN 16 |
| 3466 | char numa_zonelist_order[16] = "default"; |
| 3467 | |
| 3468 | /* |
| 3469 | * interface for configure zonelist ordering. |
| 3470 | * command line option "numa_zonelist_order" |
| 3471 | * = "[dD]efault - default, automatic configuration. |
| 3472 | * = "[nN]ode - order by node locality, then by zone within node |
| 3473 | * = "[zZ]one - order by zone, then by locality within zone |
| 3474 | */ |
| 3475 | |
| 3476 | static int __parse_numa_zonelist_order(char *s) |
| 3477 | { |
| 3478 | if (*s == 'd' || *s == 'D') { |
| 3479 | user_zonelist_order = ZONELIST_ORDER_DEFAULT; |
| 3480 | } else if (*s == 'n' || *s == 'N') { |
| 3481 | user_zonelist_order = ZONELIST_ORDER_NODE; |
| 3482 | } else if (*s == 'z' || *s == 'Z') { |
| 3483 | user_zonelist_order = ZONELIST_ORDER_ZONE; |
| 3484 | } else { |
| 3485 | printk(KERN_WARNING |
| 3486 | "Ignoring invalid numa_zonelist_order value: " |
| 3487 | "%s\n", s); |
| 3488 | return -EINVAL; |
| 3489 | } |
| 3490 | return 0; |
| 3491 | } |
| 3492 | |
| 3493 | static __init int setup_numa_zonelist_order(char *s) |
| 3494 | { |
Volodymyr G. Lukiianyk | ecb256f | 2011-01-13 15:46:26 -0800 | [diff] [blame] | 3495 | int ret; |
| 3496 | |
| 3497 | if (!s) |
| 3498 | return 0; |
| 3499 | |
| 3500 | ret = __parse_numa_zonelist_order(s); |
| 3501 | if (ret == 0) |
| 3502 | strlcpy(numa_zonelist_order, s, NUMA_ZONELIST_ORDER_LEN); |
| 3503 | |
| 3504 | return ret; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3505 | } |
| 3506 | early_param("numa_zonelist_order", setup_numa_zonelist_order); |
| 3507 | |
| 3508 | /* |
| 3509 | * sysctl handler for numa_zonelist_order |
| 3510 | */ |
Joe Perches | cccad5b | 2014-06-06 14:38:09 -0700 | [diff] [blame] | 3511 | int numa_zonelist_order_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 3512 | void __user *buffer, size_t *length, |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3513 | loff_t *ppos) |
| 3514 | { |
| 3515 | char saved_string[NUMA_ZONELIST_ORDER_LEN]; |
| 3516 | int ret; |
Andi Kleen | 443c6f1 | 2009-12-23 21:00:47 +0100 | [diff] [blame] | 3517 | static DEFINE_MUTEX(zl_order_mutex); |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3518 | |
Andi Kleen | 443c6f1 | 2009-12-23 21:00:47 +0100 | [diff] [blame] | 3519 | mutex_lock(&zl_order_mutex); |
Chen Gang | dacbde0 | 2013-07-03 15:02:35 -0700 | [diff] [blame] | 3520 | if (write) { |
| 3521 | if (strlen((char *)table->data) >= NUMA_ZONELIST_ORDER_LEN) { |
| 3522 | ret = -EINVAL; |
| 3523 | goto out; |
| 3524 | } |
| 3525 | strcpy(saved_string, (char *)table->data); |
| 3526 | } |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 3527 | ret = proc_dostring(table, write, buffer, length, ppos); |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3528 | if (ret) |
Andi Kleen | 443c6f1 | 2009-12-23 21:00:47 +0100 | [diff] [blame] | 3529 | goto out; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3530 | if (write) { |
| 3531 | int oldval = user_zonelist_order; |
Chen Gang | dacbde0 | 2013-07-03 15:02:35 -0700 | [diff] [blame] | 3532 | |
| 3533 | ret = __parse_numa_zonelist_order((char *)table->data); |
| 3534 | if (ret) { |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3535 | /* |
| 3536 | * bogus value. restore saved string |
| 3537 | */ |
Chen Gang | dacbde0 | 2013-07-03 15:02:35 -0700 | [diff] [blame] | 3538 | strncpy((char *)table->data, saved_string, |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3539 | NUMA_ZONELIST_ORDER_LEN); |
| 3540 | user_zonelist_order = oldval; |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 3541 | } else if (oldval != user_zonelist_order) { |
| 3542 | mutex_lock(&zonelists_mutex); |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 3543 | build_all_zonelists(NULL, NULL); |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 3544 | mutex_unlock(&zonelists_mutex); |
| 3545 | } |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3546 | } |
Andi Kleen | 443c6f1 | 2009-12-23 21:00:47 +0100 | [diff] [blame] | 3547 | out: |
| 3548 | mutex_unlock(&zl_order_mutex); |
| 3549 | return ret; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3550 | } |
| 3551 | |
| 3552 | |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 3553 | #define MAX_NODE_LOAD (nr_online_nodes) |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3554 | static int node_load[MAX_NUMNODES]; |
| 3555 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3556 | /** |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 3557 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3558 | * @node: node whose fallback list we're appending |
| 3559 | * @used_node_mask: nodemask_t of already used nodes |
| 3560 | * |
| 3561 | * We use a number of factors to determine which is the next node that should |
| 3562 | * appear on a given node's fallback list. The node should not have appeared |
| 3563 | * already in @node's fallback list, and it should be the next closest node |
| 3564 | * according to the distance array (which contains arbitrary distance values |
| 3565 | * from each node to each node in the system), and should also prefer nodes |
| 3566 | * with no CPUs, since presumably they'll have very little allocation pressure |
| 3567 | * on them otherwise. |
| 3568 | * It returns -1 if no node is found. |
| 3569 | */ |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3570 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3571 | { |
Linus Torvalds | 4cf808e | 2006-02-17 20:38:21 +0100 | [diff] [blame] | 3572 | int n, val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3573 | int min_val = INT_MAX; |
David Rientjes | 00ef2d2 | 2013-02-22 16:35:36 -0800 | [diff] [blame] | 3574 | int best_node = NUMA_NO_NODE; |
Rusty Russell | a70f730 | 2009-03-13 14:49:46 +1030 | [diff] [blame] | 3575 | const struct cpumask *tmp = cpumask_of_node(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3576 | |
Linus Torvalds | 4cf808e | 2006-02-17 20:38:21 +0100 | [diff] [blame] | 3577 | /* Use the local node if we haven't already */ |
| 3578 | if (!node_isset(node, *used_node_mask)) { |
| 3579 | node_set(node, *used_node_mask); |
| 3580 | return node; |
| 3581 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3582 | |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 3583 | for_each_node_state(n, N_MEMORY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3584 | |
| 3585 | /* Don't want a node to appear more than once */ |
| 3586 | if (node_isset(n, *used_node_mask)) |
| 3587 | continue; |
| 3588 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3589 | /* Use the distance array to find the distance */ |
| 3590 | val = node_distance(node, n); |
| 3591 | |
Linus Torvalds | 4cf808e | 2006-02-17 20:38:21 +0100 | [diff] [blame] | 3592 | /* Penalize nodes under us ("prefer the next node") */ |
| 3593 | val += (n < node); |
| 3594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3595 | /* Give preference to headless and unused nodes */ |
Rusty Russell | a70f730 | 2009-03-13 14:49:46 +1030 | [diff] [blame] | 3596 | tmp = cpumask_of_node(n); |
| 3597 | if (!cpumask_empty(tmp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3598 | val += PENALTY_FOR_NODE_WITH_CPUS; |
| 3599 | |
| 3600 | /* Slight preference for less loaded node */ |
| 3601 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); |
| 3602 | val += node_load[n]; |
| 3603 | |
| 3604 | if (val < min_val) { |
| 3605 | min_val = val; |
| 3606 | best_node = n; |
| 3607 | } |
| 3608 | } |
| 3609 | |
| 3610 | if (best_node >= 0) |
| 3611 | node_set(best_node, *used_node_mask); |
| 3612 | |
| 3613 | return best_node; |
| 3614 | } |
| 3615 | |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3616 | |
| 3617 | /* |
| 3618 | * Build zonelists ordered by node and zones within node. |
| 3619 | * This results in maximum locality--normal zone overflows into local |
| 3620 | * DMA zone, if any--but risks exhausting DMA zone. |
| 3621 | */ |
| 3622 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3623 | { |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3624 | int j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3625 | struct zonelist *zonelist; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3626 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3627 | zonelist = &pgdat->node_zonelists[0]; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3628 | for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++) |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3629 | ; |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3630 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3631 | zonelist->_zonerefs[j].zone = NULL; |
| 3632 | zonelist->_zonerefs[j].zone_idx = 0; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3633 | } |
| 3634 | |
| 3635 | /* |
Christoph Lameter | 523b945 | 2007-10-16 01:25:37 -0700 | [diff] [blame] | 3636 | * Build gfp_thisnode zonelists |
| 3637 | */ |
| 3638 | static void build_thisnode_zonelists(pg_data_t *pgdat) |
| 3639 | { |
Christoph Lameter | 523b945 | 2007-10-16 01:25:37 -0700 | [diff] [blame] | 3640 | int j; |
| 3641 | struct zonelist *zonelist; |
| 3642 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3643 | zonelist = &pgdat->node_zonelists[1]; |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3644 | j = build_zonelists_node(pgdat, zonelist, 0); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3645 | zonelist->_zonerefs[j].zone = NULL; |
| 3646 | zonelist->_zonerefs[j].zone_idx = 0; |
Christoph Lameter | 523b945 | 2007-10-16 01:25:37 -0700 | [diff] [blame] | 3647 | } |
| 3648 | |
| 3649 | /* |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3650 | * Build zonelists ordered by zone and nodes within zones. |
| 3651 | * This results in conserving DMA zone[s] until all Normal memory is |
| 3652 | * exhausted, but results in overflowing to remote node while memory |
| 3653 | * may still exist in local DMA zone. |
| 3654 | */ |
| 3655 | static int node_order[MAX_NUMNODES]; |
| 3656 | |
| 3657 | static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) |
| 3658 | { |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3659 | int pos, j, node; |
| 3660 | int zone_type; /* needs to be signed */ |
| 3661 | struct zone *z; |
| 3662 | struct zonelist *zonelist; |
| 3663 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3664 | zonelist = &pgdat->node_zonelists[0]; |
| 3665 | pos = 0; |
| 3666 | for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) { |
| 3667 | for (j = 0; j < nr_nodes; j++) { |
| 3668 | node = node_order[j]; |
| 3669 | z = &NODE_DATA(node)->node_zones[zone_type]; |
| 3670 | if (populated_zone(z)) { |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3671 | zoneref_set_zone(z, |
| 3672 | &zonelist->_zonerefs[pos++]); |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3673 | check_highest_zone(zone_type); |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3674 | } |
| 3675 | } |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3676 | } |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3677 | zonelist->_zonerefs[pos].zone = NULL; |
| 3678 | zonelist->_zonerefs[pos].zone_idx = 0; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3679 | } |
| 3680 | |
Mel Gorman | 3193913 | 2014-10-09 15:28:30 -0700 | [diff] [blame] | 3681 | #if defined(CONFIG_64BIT) |
| 3682 | /* |
| 3683 | * Devices that require DMA32/DMA are relatively rare and do not justify a |
| 3684 | * penalty to every machine in case the specialised case applies. Default |
| 3685 | * to Node-ordering on 64-bit NUMA machines |
| 3686 | */ |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3687 | static int default_zonelist_order(void) |
| 3688 | { |
Mel Gorman | 3193913 | 2014-10-09 15:28:30 -0700 | [diff] [blame] | 3689 | return ZONELIST_ORDER_NODE; |
| 3690 | } |
| 3691 | #else |
| 3692 | /* |
| 3693 | * On 32-bit, the Normal zone needs to be preserved for allocations accessible |
| 3694 | * by the kernel. If processes running on node 0 deplete the low memory zone |
| 3695 | * then reclaim will occur more frequency increasing stalls and potentially |
| 3696 | * be easier to OOM if a large percentage of the zone is under writeback or |
| 3697 | * dirty. The problem is significantly worse if CONFIG_HIGHPTE is not set. |
| 3698 | * Hence, default to zone ordering on 32-bit. |
| 3699 | */ |
| 3700 | static int default_zonelist_order(void) |
| 3701 | { |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3702 | return ZONELIST_ORDER_ZONE; |
| 3703 | } |
Mel Gorman | 3193913 | 2014-10-09 15:28:30 -0700 | [diff] [blame] | 3704 | #endif /* CONFIG_64BIT */ |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3705 | |
| 3706 | static void set_zonelist_order(void) |
| 3707 | { |
| 3708 | if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) |
| 3709 | current_zonelist_order = default_zonelist_order(); |
| 3710 | else |
| 3711 | current_zonelist_order = user_zonelist_order; |
| 3712 | } |
| 3713 | |
| 3714 | static void build_zonelists(pg_data_t *pgdat) |
| 3715 | { |
| 3716 | int j, node, load; |
| 3717 | enum zone_type i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3718 | nodemask_t used_mask; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3719 | int local_node, prev_node; |
| 3720 | struct zonelist *zonelist; |
| 3721 | int order = current_zonelist_order; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3722 | |
| 3723 | /* initialize zonelists */ |
Christoph Lameter | 523b945 | 2007-10-16 01:25:37 -0700 | [diff] [blame] | 3724 | for (i = 0; i < MAX_ZONELISTS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3725 | zonelist = pgdat->node_zonelists + i; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3726 | zonelist->_zonerefs[0].zone = NULL; |
| 3727 | zonelist->_zonerefs[0].zone_idx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3728 | } |
| 3729 | |
| 3730 | /* NUMA-aware ordering of nodes */ |
| 3731 | local_node = pgdat->node_id; |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 3732 | load = nr_online_nodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3733 | prev_node = local_node; |
| 3734 | nodes_clear(used_mask); |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3735 | |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3736 | memset(node_order, 0, sizeof(node_order)); |
| 3737 | j = 0; |
| 3738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3739 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
| 3740 | /* |
| 3741 | * We don't want to pressure a particular node. |
| 3742 | * So adding penalty to the first node in same |
| 3743 | * distance group to make it round-robin. |
| 3744 | */ |
David Rientjes | 957f822 | 2012-10-08 16:33:24 -0700 | [diff] [blame] | 3745 | if (node_distance(local_node, node) != |
| 3746 | node_distance(local_node, prev_node)) |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3747 | node_load[node] = load; |
| 3748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3749 | prev_node = node; |
| 3750 | load--; |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3751 | if (order == ZONELIST_ORDER_NODE) |
| 3752 | build_zonelists_in_node_order(pgdat, node); |
| 3753 | else |
| 3754 | node_order[j++] = node; /* remember order */ |
| 3755 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3756 | |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3757 | if (order == ZONELIST_ORDER_ZONE) { |
| 3758 | /* calculate node order -- i.e., DMA last! */ |
| 3759 | build_zonelists_in_zone_order(pgdat, j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3760 | } |
Christoph Lameter | 523b945 | 2007-10-16 01:25:37 -0700 | [diff] [blame] | 3761 | |
| 3762 | build_thisnode_zonelists(pgdat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3763 | } |
| 3764 | |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3765 | /* Construct the zonelist performance cache - see further mmzone.h */ |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3766 | static void build_zonelist_cache(pg_data_t *pgdat) |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3767 | { |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3768 | struct zonelist *zonelist; |
| 3769 | struct zonelist_cache *zlc; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3770 | struct zoneref *z; |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3771 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3772 | zonelist = &pgdat->node_zonelists[0]; |
| 3773 | zonelist->zlcache_ptr = zlc = &zonelist->zlcache; |
| 3774 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3775 | for (z = zonelist->_zonerefs; z->zone; z++) |
| 3776 | zlc->z_to_n[z - zonelist->_zonerefs] = zonelist_node_idx(z); |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3777 | } |
| 3778 | |
Lee Schermerhorn | 7aac789 | 2010-05-26 14:45:00 -0700 | [diff] [blame] | 3779 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
| 3780 | /* |
| 3781 | * Return node id of node used for "local" allocations. |
| 3782 | * I.e., first node id of first zone in arg node's generic zonelist. |
| 3783 | * Used for initializing percpu 'numa_mem', which is used primarily |
| 3784 | * for kernel allocations, so use GFP_KERNEL flags to locate zonelist. |
| 3785 | */ |
| 3786 | int local_memory_node(int node) |
| 3787 | { |
| 3788 | struct zone *zone; |
| 3789 | |
| 3790 | (void)first_zones_zonelist(node_zonelist(node, GFP_KERNEL), |
| 3791 | gfp_zone(GFP_KERNEL), |
| 3792 | NULL, |
| 3793 | &zone); |
| 3794 | return zone->node; |
| 3795 | } |
| 3796 | #endif |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3798 | #else /* CONFIG_NUMA */ |
| 3799 | |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3800 | static void set_zonelist_order(void) |
| 3801 | { |
| 3802 | current_zonelist_order = ZONELIST_ORDER_ZONE; |
| 3803 | } |
| 3804 | |
| 3805 | static void build_zonelists(pg_data_t *pgdat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3806 | { |
Christoph Lameter | 19655d3 | 2006-09-25 23:31:19 -0700 | [diff] [blame] | 3807 | int node, local_node; |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3808 | enum zone_type j; |
| 3809 | struct zonelist *zonelist; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3810 | |
| 3811 | local_node = pgdat->node_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3812 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3813 | zonelist = &pgdat->node_zonelists[0]; |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3814 | j = build_zonelists_node(pgdat, zonelist, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3815 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3816 | /* |
| 3817 | * Now we build the zonelist so that it contains the zones |
| 3818 | * of all the other nodes. |
| 3819 | * We don't want to pressure a particular node, so when |
| 3820 | * building the zones for node N, we make sure that the |
| 3821 | * zones coming right after the local ones are those from |
| 3822 | * node N+1 (modulo N) |
| 3823 | */ |
| 3824 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { |
| 3825 | if (!node_online(node)) |
| 3826 | continue; |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3827 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3828 | } |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3829 | for (node = 0; node < local_node; node++) { |
| 3830 | if (!node_online(node)) |
| 3831 | continue; |
Zhang Yanfei | bc732f1 | 2013-07-08 16:00:06 -0700 | [diff] [blame] | 3832 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3833 | } |
| 3834 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 3835 | zonelist->_zonerefs[j].zone = NULL; |
| 3836 | zonelist->_zonerefs[j].zone_idx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3837 | } |
| 3838 | |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3839 | /* non-NUMA variant of zonelist performance cache - just NULL zlcache_ptr */ |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3840 | static void build_zonelist_cache(pg_data_t *pgdat) |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3841 | { |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 3842 | pgdat->node_zonelists[0].zlcache_ptr = NULL; |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3843 | } |
| 3844 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3845 | #endif /* CONFIG_NUMA */ |
| 3846 | |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 3847 | /* |
| 3848 | * Boot pageset table. One per cpu which is going to be used for all |
| 3849 | * zones and all nodes. The parameters will be set in such a way |
| 3850 | * that an item put on a list will immediately be handed over to |
| 3851 | * the buddy list. This is safe since pageset manipulation is done |
| 3852 | * with interrupts disabled. |
| 3853 | * |
| 3854 | * The boot_pagesets must be kept even after bootup is complete for |
| 3855 | * unused processors and/or zones. They do play a role for bootstrapping |
| 3856 | * hotplugged processors. |
| 3857 | * |
| 3858 | * zoneinfo_show() and maybe other functions do |
| 3859 | * not check if the processor is online before following the pageset pointer. |
| 3860 | * Other parts of the kernel may not check if the zone is available. |
| 3861 | */ |
| 3862 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); |
| 3863 | static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); |
Haicheng Li | 1f52250 | 2010-05-24 14:32:51 -0700 | [diff] [blame] | 3864 | static void setup_zone_pageset(struct zone *zone); |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 3865 | |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 3866 | /* |
| 3867 | * Global mutex to protect against size modification of zonelists |
| 3868 | * as well as to serialize pageset setup for the new populated zone. |
| 3869 | */ |
| 3870 | DEFINE_MUTEX(zonelists_mutex); |
| 3871 | |
Rusty Russell | 9b1a4d3 | 2008-07-28 12:16:30 -0500 | [diff] [blame] | 3872 | /* return values int ....just for stop_machine() */ |
Jiang Liu | 4ed7e02 | 2012-07-31 16:43:35 -0700 | [diff] [blame] | 3873 | static int __build_all_zonelists(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3874 | { |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 3875 | int nid; |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 3876 | int cpu; |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 3877 | pg_data_t *self = data; |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3878 | |
Bo Liu | 7f9cfb3 | 2009-08-18 14:11:19 -0700 | [diff] [blame] | 3879 | #ifdef CONFIG_NUMA |
| 3880 | memset(node_load, 0, sizeof(node_load)); |
| 3881 | #endif |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 3882 | |
| 3883 | if (self && !node_online(self->node_id)) { |
| 3884 | build_zonelists(self); |
| 3885 | build_zonelist_cache(self); |
| 3886 | } |
| 3887 | |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3888 | for_each_online_node(nid) { |
Christoph Lameter | 7ea1530 | 2007-10-16 01:25:29 -0700 | [diff] [blame] | 3889 | pg_data_t *pgdat = NODE_DATA(nid); |
| 3890 | |
| 3891 | build_zonelists(pgdat); |
| 3892 | build_zonelist_cache(pgdat); |
Paul Jackson | 9276b1bc | 2006-12-06 20:31:48 -0800 | [diff] [blame] | 3893 | } |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 3894 | |
| 3895 | /* |
| 3896 | * Initialize the boot_pagesets that are going to be used |
| 3897 | * for bootstrapping processors. The real pagesets for |
| 3898 | * each zone will be allocated later when the per cpu |
| 3899 | * allocator is available. |
| 3900 | * |
| 3901 | * boot_pagesets are used also for bootstrapping offline |
| 3902 | * cpus if the system is already booted because the pagesets |
| 3903 | * are needed to initialize allocators on a specific cpu too. |
| 3904 | * F.e. the percpu allocator needs the page allocator which |
| 3905 | * needs the percpu allocator in order to allocate its pagesets |
| 3906 | * (a chicken-egg dilemma). |
| 3907 | */ |
Lee Schermerhorn | 7aac789 | 2010-05-26 14:45:00 -0700 | [diff] [blame] | 3908 | for_each_possible_cpu(cpu) { |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 3909 | setup_pageset(&per_cpu(boot_pageset, cpu), 0); |
| 3910 | |
Lee Schermerhorn | 7aac789 | 2010-05-26 14:45:00 -0700 | [diff] [blame] | 3911 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
| 3912 | /* |
| 3913 | * We now know the "local memory node" for each node-- |
| 3914 | * i.e., the node of the first zone in the generic zonelist. |
| 3915 | * Set up numa_mem percpu variable for on-line cpus. During |
| 3916 | * boot, only the boot cpu should be on-line; we'll init the |
| 3917 | * secondary cpus' numa_mem as they come on-line. During |
| 3918 | * node/memory hotplug, we'll fixup all on-line cpus. |
| 3919 | */ |
| 3920 | if (cpu_online(cpu)) |
| 3921 | set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); |
| 3922 | #endif |
| 3923 | } |
| 3924 | |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 3925 | return 0; |
| 3926 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3927 | |
Rasmus Villemoes | 061f67b | 2015-02-12 15:00:06 -0800 | [diff] [blame] | 3928 | static noinline void __init |
| 3929 | build_all_zonelists_init(void) |
| 3930 | { |
| 3931 | __build_all_zonelists(NULL); |
| 3932 | mminit_verify_zonelist(); |
| 3933 | cpuset_init_current_mems_allowed(); |
| 3934 | } |
| 3935 | |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 3936 | /* |
| 3937 | * Called with zonelists_mutex held always |
| 3938 | * unless system_state == SYSTEM_BOOTING. |
Rasmus Villemoes | 061f67b | 2015-02-12 15:00:06 -0800 | [diff] [blame] | 3939 | * |
| 3940 | * __ref due to (1) call of __meminit annotated setup_zone_pageset |
| 3941 | * [we're only called with non-NULL zone through __meminit paths] and |
| 3942 | * (2) call of __init annotated helper build_all_zonelists_init |
| 3943 | * [protected by SYSTEM_BOOTING]. |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 3944 | */ |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 3945 | void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 3946 | { |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3947 | set_zonelist_order(); |
| 3948 | |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 3949 | if (system_state == SYSTEM_BOOTING) { |
Rasmus Villemoes | 061f67b | 2015-02-12 15:00:06 -0800 | [diff] [blame] | 3950 | build_all_zonelists_init(); |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 3951 | } else { |
KAMEZAWA Hiroyuki | e9959f0 | 2010-11-24 12:57:09 -0800 | [diff] [blame] | 3952 | #ifdef CONFIG_MEMORY_HOTPLUG |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 3953 | if (zone) |
| 3954 | setup_zone_pageset(zone); |
KAMEZAWA Hiroyuki | e9959f0 | 2010-11-24 12:57:09 -0800 | [diff] [blame] | 3955 | #endif |
Cody P Schafer | dd1895e | 2013-07-03 15:01:36 -0700 | [diff] [blame] | 3956 | /* we have to stop all cpus to guarantee there is no user |
| 3957 | of zonelist */ |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 3958 | stop_machine(__build_all_zonelists, pgdat, NULL); |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 3959 | /* cpuset refresh routine should be here */ |
| 3960 | } |
Andrew Morton | bd1e22b | 2006-06-23 02:03:47 -0700 | [diff] [blame] | 3961 | vm_total_pages = nr_free_pagecache_pages(); |
Mel Gorman | 9ef9acb | 2007-10-16 01:25:54 -0700 | [diff] [blame] | 3962 | /* |
| 3963 | * Disable grouping by mobility if the number of pages in the |
| 3964 | * system is too low to allow the mechanism to work. It would be |
| 3965 | * more accurate, but expensive to check per-zone. This check is |
| 3966 | * made on memory-hotadd so a system can start with mobility |
| 3967 | * disabled and enable it later |
| 3968 | */ |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 3969 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
Mel Gorman | 9ef9acb | 2007-10-16 01:25:54 -0700 | [diff] [blame] | 3970 | page_group_by_mobility_disabled = 1; |
| 3971 | else |
| 3972 | page_group_by_mobility_disabled = 0; |
| 3973 | |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 3974 | pr_info("Built %i zonelists in %s order, mobility grouping %s. " |
Mel Gorman | 9ef9acb | 2007-10-16 01:25:54 -0700 | [diff] [blame] | 3975 | "Total pages: %ld\n", |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 3976 | nr_online_nodes, |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3977 | zonelist_order_name[current_zonelist_order], |
Mel Gorman | 9ef9acb | 2007-10-16 01:25:54 -0700 | [diff] [blame] | 3978 | page_group_by_mobility_disabled ? "off" : "on", |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3979 | vm_total_pages); |
| 3980 | #ifdef CONFIG_NUMA |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 3981 | pr_info("Policy zone: %s\n", zone_names[policy_zone]); |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 3982 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3983 | } |
| 3984 | |
| 3985 | /* |
| 3986 | * Helper functions to size the waitqueue hash table. |
| 3987 | * Essentially these want to choose hash table sizes sufficiently |
| 3988 | * large so that collisions trying to wait on pages are rare. |
| 3989 | * But in fact, the number of active page waitqueues on typical |
| 3990 | * systems is ridiculously low, less than 200. So this is even |
| 3991 | * conservative, even though it seems large. |
| 3992 | * |
| 3993 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to |
| 3994 | * waitqueues, i.e. the size of the waitq table given the number of pages. |
| 3995 | */ |
| 3996 | #define PAGES_PER_WAITQUEUE 256 |
| 3997 | |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 3998 | #ifndef CONFIG_MEMORY_HOTPLUG |
Yasunori Goto | 02b694d | 2006-06-23 02:03:08 -0700 | [diff] [blame] | 3999 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4000 | { |
| 4001 | unsigned long size = 1; |
| 4002 | |
| 4003 | pages /= PAGES_PER_WAITQUEUE; |
| 4004 | |
| 4005 | while (size < pages) |
| 4006 | size <<= 1; |
| 4007 | |
| 4008 | /* |
| 4009 | * Once we have dozens or even hundreds of threads sleeping |
| 4010 | * on IO we've got bigger problems than wait queue collision. |
| 4011 | * Limit the size of the wait table to a reasonable size. |
| 4012 | */ |
| 4013 | size = min(size, 4096UL); |
| 4014 | |
| 4015 | return max(size, 4UL); |
| 4016 | } |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4017 | #else |
| 4018 | /* |
| 4019 | * A zone's size might be changed by hot-add, so it is not possible to determine |
| 4020 | * a suitable size for its wait_table. So we use the maximum size now. |
| 4021 | * |
| 4022 | * The max wait table size = 4096 x sizeof(wait_queue_head_t). ie: |
| 4023 | * |
| 4024 | * i386 (preemption config) : 4096 x 16 = 64Kbyte. |
| 4025 | * ia64, x86-64 (no preemption): 4096 x 20 = 80Kbyte. |
| 4026 | * ia64, x86-64 (preemption) : 4096 x 24 = 96Kbyte. |
| 4027 | * |
| 4028 | * The maximum entries are prepared when a zone's memory is (512K + 256) pages |
| 4029 | * or more by the traditional way. (See above). It equals: |
| 4030 | * |
| 4031 | * i386, x86-64, powerpc(4K page size) : = ( 2G + 1M)byte. |
| 4032 | * ia64(16K page size) : = ( 8G + 4M)byte. |
| 4033 | * powerpc (64K page size) : = (32G +16M)byte. |
| 4034 | */ |
| 4035 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
| 4036 | { |
| 4037 | return 4096UL; |
| 4038 | } |
| 4039 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4040 | |
| 4041 | /* |
| 4042 | * This is an integer logarithm so that shifts can be used later |
| 4043 | * to extract the more random high bits from the multiplicative |
| 4044 | * hash function before the remainder is taken. |
| 4045 | */ |
| 4046 | static inline unsigned long wait_table_bits(unsigned long size) |
| 4047 | { |
| 4048 | return ffz(~size); |
| 4049 | } |
| 4050 | |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4051 | /* |
Arve Hjønnevåg | 6d3163c | 2011-05-24 17:12:24 -0700 | [diff] [blame] | 4052 | * Check if a pageblock contains reserved pages |
| 4053 | */ |
| 4054 | static int pageblock_is_reserved(unsigned long start_pfn, unsigned long end_pfn) |
| 4055 | { |
| 4056 | unsigned long pfn; |
| 4057 | |
| 4058 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
| 4059 | if (!pfn_valid_within(pfn) || PageReserved(pfn_to_page(pfn))) |
| 4060 | return 1; |
| 4061 | } |
| 4062 | return 0; |
| 4063 | } |
| 4064 | |
| 4065 | /* |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4066 | * Mark a number of pageblocks as MIGRATE_RESERVE. The number |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 4067 | * of blocks reserved is based on min_wmark_pages(zone). The memory within |
| 4068 | * the reserve will tend to store contiguous free pages. Setting min_free_kbytes |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4069 | * higher will lead to a bigger reserve which will get freed as contiguous |
| 4070 | * blocks as reclaim kicks in |
| 4071 | */ |
| 4072 | static void setup_zone_migrate_reserve(struct zone *zone) |
| 4073 | { |
Arve Hjønnevåg | 6d3163c | 2011-05-24 17:12:24 -0700 | [diff] [blame] | 4074 | unsigned long start_pfn, pfn, end_pfn, block_end_pfn; |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4075 | struct page *page; |
Mel Gorman | 78986a6 | 2009-09-21 17:03:02 -0700 | [diff] [blame] | 4076 | unsigned long block_migratetype; |
| 4077 | int reserve; |
Yasuaki Ishimatsu | 943dca1 | 2014-01-21 15:49:06 -0800 | [diff] [blame] | 4078 | int old_reserve; |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4079 | |
Michal Hocko | d0215638 | 2011-12-08 14:34:27 -0800 | [diff] [blame] | 4080 | /* |
| 4081 | * Get the start pfn, end pfn and the number of blocks to reserve |
| 4082 | * We have to be careful to be aligned to pageblock_nr_pages to |
| 4083 | * make sure that we always check pfn_valid for the first page in |
| 4084 | * the block. |
| 4085 | */ |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4086 | start_pfn = zone->zone_start_pfn; |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 4087 | end_pfn = zone_end_pfn(zone); |
Michal Hocko | d0215638 | 2011-12-08 14:34:27 -0800 | [diff] [blame] | 4088 | start_pfn = roundup(start_pfn, pageblock_nr_pages); |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 4089 | reserve = roundup(min_wmark_pages(zone), pageblock_nr_pages) >> |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4090 | pageblock_order; |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4091 | |
Mel Gorman | 78986a6 | 2009-09-21 17:03:02 -0700 | [diff] [blame] | 4092 | /* |
| 4093 | * Reserve blocks are generally in place to help high-order atomic |
| 4094 | * allocations that are short-lived. A min_free_kbytes value that |
| 4095 | * would result in more than 2 reserve blocks for atomic allocations |
| 4096 | * is assumed to be in place to help anti-fragmentation for the |
| 4097 | * future allocation of hugepages at runtime. |
| 4098 | */ |
| 4099 | reserve = min(2, reserve); |
Yasuaki Ishimatsu | 943dca1 | 2014-01-21 15:49:06 -0800 | [diff] [blame] | 4100 | old_reserve = zone->nr_migrate_reserve_block; |
| 4101 | |
| 4102 | /* When memory hot-add, we almost always need to do nothing */ |
| 4103 | if (reserve == old_reserve) |
| 4104 | return; |
| 4105 | zone->nr_migrate_reserve_block = reserve; |
Mel Gorman | 78986a6 | 2009-09-21 17:03:02 -0700 | [diff] [blame] | 4106 | |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4107 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4108 | if (!pfn_valid(pfn)) |
| 4109 | continue; |
| 4110 | page = pfn_to_page(pfn); |
| 4111 | |
Adam Litke | 344c790 | 2008-09-02 14:35:38 -0700 | [diff] [blame] | 4112 | /* Watch out for overlapping nodes */ |
| 4113 | if (page_to_nid(page) != zone_to_nid(zone)) |
| 4114 | continue; |
| 4115 | |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4116 | block_migratetype = get_pageblock_migratetype(page); |
| 4117 | |
Mel Gorman | 938929f | 2012-01-10 15:07:14 -0800 | [diff] [blame] | 4118 | /* Only test what is necessary when the reserves are not met */ |
| 4119 | if (reserve > 0) { |
| 4120 | /* |
| 4121 | * Blocks with reserved pages will never free, skip |
| 4122 | * them. |
| 4123 | */ |
| 4124 | block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn); |
| 4125 | if (pageblock_is_reserved(pfn, block_end_pfn)) |
| 4126 | continue; |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4127 | |
Mel Gorman | 938929f | 2012-01-10 15:07:14 -0800 | [diff] [blame] | 4128 | /* If this block is reserved, account for it */ |
| 4129 | if (block_migratetype == MIGRATE_RESERVE) { |
| 4130 | reserve--; |
| 4131 | continue; |
| 4132 | } |
| 4133 | |
| 4134 | /* Suitable for reserving if this block is movable */ |
| 4135 | if (block_migratetype == MIGRATE_MOVABLE) { |
| 4136 | set_pageblock_migratetype(page, |
| 4137 | MIGRATE_RESERVE); |
| 4138 | move_freepages_block(zone, page, |
| 4139 | MIGRATE_RESERVE); |
| 4140 | reserve--; |
| 4141 | continue; |
| 4142 | } |
Yasuaki Ishimatsu | 943dca1 | 2014-01-21 15:49:06 -0800 | [diff] [blame] | 4143 | } else if (!old_reserve) { |
| 4144 | /* |
| 4145 | * At boot time we don't need to scan the whole zone |
| 4146 | * for turning off MIGRATE_RESERVE. |
| 4147 | */ |
| 4148 | break; |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4149 | } |
| 4150 | |
| 4151 | /* |
| 4152 | * If the reserve is met and this is a previous reserved block, |
| 4153 | * take it back |
| 4154 | */ |
| 4155 | if (block_migratetype == MIGRATE_RESERVE) { |
| 4156 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
| 4157 | move_freepages_block(zone, page, MIGRATE_MOVABLE); |
| 4158 | } |
| 4159 | } |
| 4160 | } |
Mel Gorman | ac0e5b7 | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4162 | /* |
| 4163 | * Initially all pages are reserved - free ones are freed |
| 4164 | * up by free_all_bootmem() once the early boot process is |
| 4165 | * done. Non-atomic initialization, single-pass. |
| 4166 | */ |
Matt Tolentino | c09b424 | 2006-01-17 07:03:44 +0100 | [diff] [blame] | 4167 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 4168 | unsigned long start_pfn, enum memmap_context context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4169 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4170 | struct page *page; |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 4171 | unsigned long end_pfn = start_pfn + size; |
| 4172 | unsigned long pfn; |
KAMEZAWA Hiroyuki | 86051ca | 2008-04-29 00:58:21 -0700 | [diff] [blame] | 4173 | struct zone *z; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4174 | |
Hugh Dickins | 22b31ee | 2009-01-06 14:40:09 -0800 | [diff] [blame] | 4175 | if (highest_memmap_pfn < end_pfn - 1) |
| 4176 | highest_memmap_pfn = end_pfn - 1; |
| 4177 | |
KAMEZAWA Hiroyuki | 86051ca | 2008-04-29 00:58:21 -0700 | [diff] [blame] | 4178 | z = &NODE_DATA(nid)->node_zones[zone]; |
Greg Ungerer | cbe8dd4 | 2006-01-12 01:05:24 -0800 | [diff] [blame] | 4179 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 4180 | /* |
| 4181 | * There can be holes in boot-time mem_map[]s |
| 4182 | * handed to this function. They do not |
| 4183 | * exist on hotplugged memory. |
| 4184 | */ |
| 4185 | if (context == MEMMAP_EARLY) { |
| 4186 | if (!early_pfn_valid(pfn)) |
| 4187 | continue; |
| 4188 | if (!early_pfn_in_nid(pfn, nid)) |
| 4189 | continue; |
| 4190 | } |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 4191 | page = pfn_to_page(pfn); |
| 4192 | set_page_links(page, zone, nid, pfn); |
Mel Gorman | 708614e | 2008-07-23 21:26:51 -0700 | [diff] [blame] | 4193 | mminit_verify_page_links(page, zone, nid, pfn); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 4194 | init_page_count(page); |
Mel Gorman | 22b751c | 2013-02-22 16:34:59 -0800 | [diff] [blame] | 4195 | page_mapcount_reset(page); |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 4196 | page_cpupid_reset_last(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4197 | SetPageReserved(page); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 4198 | /* |
| 4199 | * Mark the block movable so that blocks are reserved for |
| 4200 | * movable at startup. This will force kernel allocations |
| 4201 | * to reserve their blocks rather than leaking throughout |
| 4202 | * the address space during boot when many long-lived |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4203 | * kernel allocations are made. Later some blocks near |
| 4204 | * the start are marked MIGRATE_RESERVE by |
| 4205 | * setup_zone_migrate_reserve() |
KAMEZAWA Hiroyuki | 86051ca | 2008-04-29 00:58:21 -0700 | [diff] [blame] | 4206 | * |
| 4207 | * bitmap is created for zone's valid pfn range. but memmap |
| 4208 | * can be created for invalid pages (for alignment) |
| 4209 | * check here not to call set_pageblock_migratetype() against |
| 4210 | * pfn out of zone. |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 4211 | */ |
KAMEZAWA Hiroyuki | 86051ca | 2008-04-29 00:58:21 -0700 | [diff] [blame] | 4212 | if ((z->zone_start_pfn <= pfn) |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 4213 | && (pfn < zone_end_pfn(z)) |
KAMEZAWA Hiroyuki | 86051ca | 2008-04-29 00:58:21 -0700 | [diff] [blame] | 4214 | && !(pfn & (pageblock_nr_pages - 1))) |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 4215 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 4216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4217 | INIT_LIST_HEAD(&page->lru); |
| 4218 | #ifdef WANT_PAGE_VIRTUAL |
| 4219 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ |
| 4220 | if (!is_highmem_idx(zone)) |
Bob Picco | 3212c6b | 2005-06-27 14:36:28 -0700 | [diff] [blame] | 4221 | set_page_address(page, __va(pfn << PAGE_SHIFT)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4222 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4223 | } |
| 4224 | } |
| 4225 | |
Andi Kleen | 1e548de | 2008-02-04 22:29:26 -0800 | [diff] [blame] | 4226 | static void __meminit zone_init_free_lists(struct zone *zone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4227 | { |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 4228 | unsigned int order, t; |
Mel Gorman | b2a0ac8 | 2007-10-16 01:25:48 -0700 | [diff] [blame] | 4229 | for_each_migratetype_order(order, t) { |
| 4230 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4231 | zone->free_area[order].nr_free = 0; |
| 4232 | } |
| 4233 | } |
| 4234 | |
| 4235 | #ifndef __HAVE_ARCH_MEMMAP_INIT |
| 4236 | #define memmap_init(size, nid, zone, start_pfn) \ |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 4237 | memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4238 | #endif |
| 4239 | |
David Rientjes | 7cd2b0a | 2014-06-23 13:22:04 -0700 | [diff] [blame] | 4240 | static int zone_batchsize(struct zone *zone) |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4241 | { |
David Howells | 3a6be87 | 2009-05-06 16:03:03 -0700 | [diff] [blame] | 4242 | #ifdef CONFIG_MMU |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4243 | int batch; |
| 4244 | |
| 4245 | /* |
| 4246 | * The per-cpu-pages pools are set to around 1000th of the |
Seth, Rohit | ba56e91 | 2005-10-29 18:15:47 -0700 | [diff] [blame] | 4247 | * size of the zone. But no more than 1/2 of a meg. |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4248 | * |
| 4249 | * OK, so we don't know how big the cache is. So guess. |
| 4250 | */ |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 4251 | batch = zone->managed_pages / 1024; |
Seth, Rohit | ba56e91 | 2005-10-29 18:15:47 -0700 | [diff] [blame] | 4252 | if (batch * PAGE_SIZE > 512 * 1024) |
| 4253 | batch = (512 * 1024) / PAGE_SIZE; |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4254 | batch /= 4; /* We effectively *= 4 below */ |
| 4255 | if (batch < 1) |
| 4256 | batch = 1; |
| 4257 | |
| 4258 | /* |
Nick Piggin | 0ceaacc | 2005-12-04 13:55:25 +1100 | [diff] [blame] | 4259 | * Clamp the batch to a 2^n - 1 value. Having a power |
| 4260 | * of 2 value was found to be more likely to have |
| 4261 | * suboptimal cache aliasing properties in some cases. |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4262 | * |
Nick Piggin | 0ceaacc | 2005-12-04 13:55:25 +1100 | [diff] [blame] | 4263 | * For example if 2 tasks are alternately allocating |
| 4264 | * batches of pages, one task can end up with a lot |
| 4265 | * of pages of one half of the possible page colors |
| 4266 | * and the other with pages of the other colors. |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4267 | */ |
David Howells | 9155203 | 2009-05-06 16:03:02 -0700 | [diff] [blame] | 4268 | batch = rounddown_pow_of_two(batch + batch/2) - 1; |
Seth, Rohit | ba56e91 | 2005-10-29 18:15:47 -0700 | [diff] [blame] | 4269 | |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4270 | return batch; |
David Howells | 3a6be87 | 2009-05-06 16:03:03 -0700 | [diff] [blame] | 4271 | |
| 4272 | #else |
| 4273 | /* The deferral and batching of frees should be suppressed under NOMMU |
| 4274 | * conditions. |
| 4275 | * |
| 4276 | * The problem is that NOMMU needs to be able to allocate large chunks |
| 4277 | * of contiguous memory as there's no hardware page translation to |
| 4278 | * assemble apparent contiguous memory from discontiguous pages. |
| 4279 | * |
| 4280 | * Queueing large contiguous runs of pages for batching, however, |
| 4281 | * causes the pages to actually be freed in smaller chunks. As there |
| 4282 | * can be a significant delay between the individual batches being |
| 4283 | * recycled, this leads to the once large chunks of space being |
| 4284 | * fragmented and becoming unavailable for high-order allocations. |
| 4285 | */ |
| 4286 | return 0; |
| 4287 | #endif |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4288 | } |
| 4289 | |
Cody P Schafer | 8d7a8fa | 2013-07-03 15:01:31 -0700 | [diff] [blame] | 4290 | /* |
| 4291 | * pcp->high and pcp->batch values are related and dependent on one another: |
| 4292 | * ->batch must never be higher then ->high. |
| 4293 | * The following function updates them in a safe manner without read side |
| 4294 | * locking. |
| 4295 | * |
| 4296 | * Any new users of pcp->batch and pcp->high should ensure they can cope with |
| 4297 | * those fields changing asynchronously (acording the the above rule). |
| 4298 | * |
| 4299 | * mutex_is_locked(&pcp_batch_high_lock) required when calling this function |
| 4300 | * outside of boot time (or some other assurance that no concurrent updaters |
| 4301 | * exist). |
| 4302 | */ |
| 4303 | static void pageset_update(struct per_cpu_pages *pcp, unsigned long high, |
| 4304 | unsigned long batch) |
| 4305 | { |
| 4306 | /* start with a fail safe value for batch */ |
| 4307 | pcp->batch = 1; |
| 4308 | smp_wmb(); |
| 4309 | |
| 4310 | /* Update high, then batch, in order */ |
| 4311 | pcp->high = high; |
| 4312 | smp_wmb(); |
| 4313 | |
| 4314 | pcp->batch = batch; |
| 4315 | } |
| 4316 | |
Cody P Schafer | 3664033 | 2013-07-03 15:01:40 -0700 | [diff] [blame] | 4317 | /* a companion to pageset_set_high() */ |
Cody P Schafer | 4008bab | 2013-07-03 15:01:28 -0700 | [diff] [blame] | 4318 | static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch) |
| 4319 | { |
Cody P Schafer | 8d7a8fa | 2013-07-03 15:01:31 -0700 | [diff] [blame] | 4320 | pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch)); |
Cody P Schafer | 4008bab | 2013-07-03 15:01:28 -0700 | [diff] [blame] | 4321 | } |
| 4322 | |
Cody P Schafer | 88c90db | 2013-07-03 15:01:35 -0700 | [diff] [blame] | 4323 | static void pageset_init(struct per_cpu_pageset *p) |
Christoph Lameter | 2caaad4 | 2005-06-21 17:15:00 -0700 | [diff] [blame] | 4324 | { |
| 4325 | struct per_cpu_pages *pcp; |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 4326 | int migratetype; |
Christoph Lameter | 2caaad4 | 2005-06-21 17:15:00 -0700 | [diff] [blame] | 4327 | |
Magnus Damm | 1c6fe94 | 2005-10-26 01:58:59 -0700 | [diff] [blame] | 4328 | memset(p, 0, sizeof(*p)); |
| 4329 | |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 4330 | pcp = &p->pcp; |
Christoph Lameter | 2caaad4 | 2005-06-21 17:15:00 -0700 | [diff] [blame] | 4331 | pcp->count = 0; |
Mel Gorman | 5f8dcc2 | 2009-09-21 17:03:19 -0700 | [diff] [blame] | 4332 | for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) |
| 4333 | INIT_LIST_HEAD(&pcp->lists[migratetype]); |
Christoph Lameter | 2caaad4 | 2005-06-21 17:15:00 -0700 | [diff] [blame] | 4334 | } |
| 4335 | |
Cody P Schafer | 88c90db | 2013-07-03 15:01:35 -0700 | [diff] [blame] | 4336 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
| 4337 | { |
| 4338 | pageset_init(p); |
| 4339 | pageset_set_batch(p, batch); |
| 4340 | } |
| 4341 | |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 4342 | /* |
Cody P Schafer | 3664033 | 2013-07-03 15:01:40 -0700 | [diff] [blame] | 4343 | * pageset_set_high() sets the high water mark for hot per_cpu_pagelist |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 4344 | * to the value high for the pageset p. |
| 4345 | */ |
Cody P Schafer | 3664033 | 2013-07-03 15:01:40 -0700 | [diff] [blame] | 4346 | static void pageset_set_high(struct per_cpu_pageset *p, |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 4347 | unsigned long high) |
| 4348 | { |
Cody P Schafer | 8d7a8fa | 2013-07-03 15:01:31 -0700 | [diff] [blame] | 4349 | unsigned long batch = max(1UL, high / 4); |
| 4350 | if ((high / 4) > (PAGE_SHIFT * 8)) |
| 4351 | batch = PAGE_SHIFT * 8; |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 4352 | |
Cody P Schafer | 8d7a8fa | 2013-07-03 15:01:31 -0700 | [diff] [blame] | 4353 | pageset_update(&p->pcp, high, batch); |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 4354 | } |
| 4355 | |
David Rientjes | 7cd2b0a | 2014-06-23 13:22:04 -0700 | [diff] [blame] | 4356 | static void pageset_set_high_and_batch(struct zone *zone, |
| 4357 | struct per_cpu_pageset *pcp) |
Cody P Schafer | 56cef2b | 2013-07-03 15:01:38 -0700 | [diff] [blame] | 4358 | { |
Cody P Schafer | 56cef2b | 2013-07-03 15:01:38 -0700 | [diff] [blame] | 4359 | if (percpu_pagelist_fraction) |
Cody P Schafer | 3664033 | 2013-07-03 15:01:40 -0700 | [diff] [blame] | 4360 | pageset_set_high(pcp, |
Cody P Schafer | 56cef2b | 2013-07-03 15:01:38 -0700 | [diff] [blame] | 4361 | (zone->managed_pages / |
| 4362 | percpu_pagelist_fraction)); |
| 4363 | else |
| 4364 | pageset_set_batch(pcp, zone_batchsize(zone)); |
| 4365 | } |
| 4366 | |
Cody P Schafer | 169f6c1 | 2013-07-03 15:01:41 -0700 | [diff] [blame] | 4367 | static void __meminit zone_pageset_init(struct zone *zone, int cpu) |
| 4368 | { |
| 4369 | struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); |
| 4370 | |
| 4371 | pageset_init(pcp); |
| 4372 | pageset_set_high_and_batch(zone, pcp); |
| 4373 | } |
| 4374 | |
Jiang Liu | 4ed7e02 | 2012-07-31 16:43:35 -0700 | [diff] [blame] | 4375 | static void __meminit setup_zone_pageset(struct zone *zone) |
Wu Fengguang | 319774e | 2010-05-24 14:32:49 -0700 | [diff] [blame] | 4376 | { |
| 4377 | int cpu; |
Wu Fengguang | 319774e | 2010-05-24 14:32:49 -0700 | [diff] [blame] | 4378 | zone->pageset = alloc_percpu(struct per_cpu_pageset); |
Cody P Schafer | 56cef2b | 2013-07-03 15:01:38 -0700 | [diff] [blame] | 4379 | for_each_possible_cpu(cpu) |
| 4380 | zone_pageset_init(zone, cpu); |
Wu Fengguang | 319774e | 2010-05-24 14:32:49 -0700 | [diff] [blame] | 4381 | } |
| 4382 | |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4383 | /* |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 4384 | * Allocate per cpu pagesets and initialize them. |
| 4385 | * Before this call only boot pagesets were available. |
Christoph Lameter | 2caaad4 | 2005-06-21 17:15:00 -0700 | [diff] [blame] | 4386 | */ |
Al Viro | 78d9955 | 2005-12-15 09:18:25 +0000 | [diff] [blame] | 4387 | void __init setup_per_cpu_pageset(void) |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4388 | { |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 4389 | struct zone *zone; |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4390 | |
Wu Fengguang | 319774e | 2010-05-24 14:32:49 -0700 | [diff] [blame] | 4391 | for_each_populated_zone(zone) |
| 4392 | setup_zone_pageset(zone); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 4393 | } |
| 4394 | |
Sam Ravnborg | 577a32f | 2007-05-17 23:29:25 +0200 | [diff] [blame] | 4395 | static noinline __init_refok |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4396 | int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4397 | { |
| 4398 | int i; |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4399 | size_t alloc_size; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4400 | |
| 4401 | /* |
| 4402 | * The per-page waitqueue mechanism uses hashed waitqueues |
| 4403 | * per zone. |
| 4404 | */ |
Yasunori Goto | 02b694d | 2006-06-23 02:03:08 -0700 | [diff] [blame] | 4405 | zone->wait_table_hash_nr_entries = |
| 4406 | wait_table_hash_nr_entries(zone_size_pages); |
| 4407 | zone->wait_table_bits = |
| 4408 | wait_table_bits(zone->wait_table_hash_nr_entries); |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4409 | alloc_size = zone->wait_table_hash_nr_entries |
| 4410 | * sizeof(wait_queue_head_t); |
| 4411 | |
Heiko Carstens | cd94b9d | 2008-05-23 13:04:52 -0700 | [diff] [blame] | 4412 | if (!slab_is_available()) { |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4413 | zone->wait_table = (wait_queue_head_t *) |
Santosh Shilimkar | 6782832 | 2014-01-21 15:50:25 -0800 | [diff] [blame] | 4414 | memblock_virt_alloc_node_nopanic( |
| 4415 | alloc_size, zone->zone_pgdat->node_id); |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4416 | } else { |
| 4417 | /* |
| 4418 | * This case means that a zone whose size was 0 gets new memory |
| 4419 | * via memory hot-add. |
| 4420 | * But it may be the case that a new node was hot-added. In |
| 4421 | * this case vmalloc() will not be able to use this new node's |
| 4422 | * memory - this wait_table must be initialized to use this new |
| 4423 | * node itself as well. |
| 4424 | * To use this new node's memory, further consideration will be |
| 4425 | * necessary. |
| 4426 | */ |
Jesper Juhl | 8691f3a | 2007-10-16 01:24:49 -0700 | [diff] [blame] | 4427 | zone->wait_table = vmalloc(alloc_size); |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4428 | } |
| 4429 | if (!zone->wait_table) |
| 4430 | return -ENOMEM; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4431 | |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 4432 | for (i = 0; i < zone->wait_table_hash_nr_entries; ++i) |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4433 | init_waitqueue_head(zone->wait_table + i); |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4434 | |
| 4435 | return 0; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4436 | } |
| 4437 | |
Matt Tolentino | c09b424 | 2006-01-17 07:03:44 +0100 | [diff] [blame] | 4438 | static __meminit void zone_pcp_init(struct zone *zone) |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4439 | { |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 4440 | /* |
| 4441 | * per cpu subsystem is not up at this point. The following code |
| 4442 | * relies on the ability of the linker to provide the |
| 4443 | * offset of a (static) per cpu variable into the per cpu area. |
| 4444 | */ |
| 4445 | zone->pageset = &boot_pageset; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4446 | |
Xishi Qiu | b38a872 | 2013-11-12 15:07:20 -0800 | [diff] [blame] | 4447 | if (populated_zone(zone)) |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 4448 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n", |
| 4449 | zone->name, zone->present_pages, |
| 4450 | zone_batchsize(zone)); |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4451 | } |
| 4452 | |
Jiang Liu | 4ed7e02 | 2012-07-31 16:43:35 -0700 | [diff] [blame] | 4453 | int __meminit init_currently_empty_zone(struct zone *zone, |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4454 | unsigned long zone_start_pfn, |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 4455 | unsigned long size, |
| 4456 | enum memmap_context context) |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4457 | { |
| 4458 | struct pglist_data *pgdat = zone->zone_pgdat; |
Yasunori Goto | cca448f | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4459 | int ret; |
| 4460 | ret = zone_wait_table_init(zone, size); |
| 4461 | if (ret) |
| 4462 | return ret; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4463 | pgdat->nr_zones = zone_idx(zone) + 1; |
| 4464 | |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4465 | zone->zone_start_pfn = zone_start_pfn; |
| 4466 | |
Mel Gorman | 708614e | 2008-07-23 21:26:51 -0700 | [diff] [blame] | 4467 | mminit_dprintk(MMINIT_TRACE, "memmap_init", |
| 4468 | "Initialising map node %d zone %lu pfns %lu -> %lu\n", |
| 4469 | pgdat->node_id, |
| 4470 | (unsigned long)zone_idx(zone), |
| 4471 | zone_start_pfn, (zone_start_pfn + size)); |
| 4472 | |
Andi Kleen | 1e548de | 2008-02-04 22:29:26 -0800 | [diff] [blame] | 4473 | zone_init_free_lists(zone); |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4474 | |
| 4475 | return 0; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4476 | } |
| 4477 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 4478 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4479 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
| 4480 | /* |
| 4481 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4482 | */ |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 4483 | int __meminit __early_pfn_to_nid(unsigned long pfn) |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4484 | { |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4485 | unsigned long start_pfn, end_pfn; |
Yinghai Lu | e76b63f | 2013-09-11 14:22:17 -0700 | [diff] [blame] | 4486 | int nid; |
Russ Anderson | 7c243c7 | 2013-04-29 15:07:59 -0700 | [diff] [blame] | 4487 | /* |
| 4488 | * NOTE: The following SMP-unsafe globals are only used early in boot |
| 4489 | * when the kernel is running single-threaded. |
| 4490 | */ |
| 4491 | static unsigned long __meminitdata last_start_pfn, last_end_pfn; |
| 4492 | static int __meminitdata last_nid; |
| 4493 | |
| 4494 | if (last_start_pfn <= pfn && pfn < last_end_pfn) |
| 4495 | return last_nid; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4496 | |
Yinghai Lu | e76b63f | 2013-09-11 14:22:17 -0700 | [diff] [blame] | 4497 | nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn); |
| 4498 | if (nid != -1) { |
| 4499 | last_start_pfn = start_pfn; |
| 4500 | last_end_pfn = end_pfn; |
| 4501 | last_nid = nid; |
| 4502 | } |
| 4503 | |
| 4504 | return nid; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4505 | } |
| 4506 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ |
| 4507 | |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 4508 | int __meminit early_pfn_to_nid(unsigned long pfn) |
| 4509 | { |
KAMEZAWA Hiroyuki | cc2559b | 2009-02-18 14:48:33 -0800 | [diff] [blame] | 4510 | int nid; |
| 4511 | |
| 4512 | nid = __early_pfn_to_nid(pfn); |
| 4513 | if (nid >= 0) |
| 4514 | return nid; |
| 4515 | /* just returns 0 */ |
| 4516 | return 0; |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 4517 | } |
| 4518 | |
KAMEZAWA Hiroyuki | cc2559b | 2009-02-18 14:48:33 -0800 | [diff] [blame] | 4519 | #ifdef CONFIG_NODES_SPAN_OTHER_NODES |
| 4520 | bool __meminit early_pfn_in_nid(unsigned long pfn, int node) |
| 4521 | { |
| 4522 | int nid; |
| 4523 | |
| 4524 | nid = __early_pfn_to_nid(pfn); |
| 4525 | if (nid >= 0 && nid != node) |
| 4526 | return false; |
| 4527 | return true; |
| 4528 | } |
| 4529 | #endif |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 4530 | |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4531 | /** |
Santosh Shilimkar | 6782832 | 2014-01-21 15:50:25 -0800 | [diff] [blame] | 4532 | * free_bootmem_with_active_regions - Call memblock_free_early_nid for each active range |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 4533 | * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. |
Santosh Shilimkar | 6782832 | 2014-01-21 15:50:25 -0800 | [diff] [blame] | 4534 | * @max_low_pfn: The highest PFN that will be passed to memblock_free_early_nid |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4535 | * |
Zhang Zhen | 7d01817 | 2014-06-04 16:10:53 -0700 | [diff] [blame] | 4536 | * If an architecture guarantees that all ranges registered contain no holes |
| 4537 | * and may be freed, this this function may be used instead of calling |
| 4538 | * memblock_free_early_nid() manually. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4539 | */ |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4540 | void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn) |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4541 | { |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4542 | unsigned long start_pfn, end_pfn; |
| 4543 | int i, this_nid; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4544 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4545 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) { |
| 4546 | start_pfn = min(start_pfn, max_low_pfn); |
| 4547 | end_pfn = min(end_pfn, max_low_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4548 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4549 | if (start_pfn < end_pfn) |
Santosh Shilimkar | 6782832 | 2014-01-21 15:50:25 -0800 | [diff] [blame] | 4550 | memblock_free_early_nid(PFN_PHYS(start_pfn), |
| 4551 | (end_pfn - start_pfn) << PAGE_SHIFT, |
| 4552 | this_nid); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4553 | } |
| 4554 | } |
| 4555 | |
| 4556 | /** |
| 4557 | * sparse_memory_present_with_active_regions - Call memory_present for each active range |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 4558 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4559 | * |
Zhang Zhen | 7d01817 | 2014-06-04 16:10:53 -0700 | [diff] [blame] | 4560 | * If an architecture guarantees that all ranges registered contain no holes and may |
| 4561 | * be freed, this function may be used instead of calling memory_present() manually. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4562 | */ |
| 4563 | void __init sparse_memory_present_with_active_regions(int nid) |
| 4564 | { |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4565 | unsigned long start_pfn, end_pfn; |
| 4566 | int i, this_nid; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4567 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4568 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) |
| 4569 | memory_present(this_nid, start_pfn, end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4570 | } |
| 4571 | |
| 4572 | /** |
| 4573 | * get_pfn_range_for_nid - Return the start and end page frames for a node |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 4574 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
| 4575 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. |
| 4576 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4577 | * |
| 4578 | * It returns the start and end page frame of a node based on information |
Zhang Zhen | 7d01817 | 2014-06-04 16:10:53 -0700 | [diff] [blame] | 4579 | * provided by memblock_set_node(). If called for a node |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4580 | * with no available memory, a warning is printed and the start and end |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 4581 | * PFNs will be 0. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4582 | */ |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 4583 | void __meminit get_pfn_range_for_nid(unsigned int nid, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4584 | unsigned long *start_pfn, unsigned long *end_pfn) |
| 4585 | { |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4586 | unsigned long this_start_pfn, this_end_pfn; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4587 | int i; |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4588 | |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4589 | *start_pfn = -1UL; |
| 4590 | *end_pfn = 0; |
| 4591 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 4592 | for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) { |
| 4593 | *start_pfn = min(*start_pfn, this_start_pfn); |
| 4594 | *end_pfn = max(*end_pfn, this_end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4595 | } |
| 4596 | |
Christoph Lameter | 633c066 | 2007-10-16 01:25:37 -0700 | [diff] [blame] | 4597 | if (*start_pfn == -1UL) |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4598 | *start_pfn = 0; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4599 | } |
| 4600 | |
| 4601 | /* |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 4602 | * This finds a zone that can be used for ZONE_MOVABLE pages. The |
| 4603 | * assumption is made that zones within a node are ordered in monotonic |
| 4604 | * increasing memory addresses so that the "highest" populated zone is used |
| 4605 | */ |
Adrian Bunk | b69a728 | 2008-07-23 21:28:12 -0700 | [diff] [blame] | 4606 | static void __init find_usable_zone_for_movable(void) |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 4607 | { |
| 4608 | int zone_index; |
| 4609 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { |
| 4610 | if (zone_index == ZONE_MOVABLE) |
| 4611 | continue; |
| 4612 | |
| 4613 | if (arch_zone_highest_possible_pfn[zone_index] > |
| 4614 | arch_zone_lowest_possible_pfn[zone_index]) |
| 4615 | break; |
| 4616 | } |
| 4617 | |
| 4618 | VM_BUG_ON(zone_index == -1); |
| 4619 | movable_zone = zone_index; |
| 4620 | } |
| 4621 | |
| 4622 | /* |
| 4623 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4624 | * because it is sized independent of architecture. Unlike the other zones, |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 4625 | * the starting point for ZONE_MOVABLE is not fixed. It may be different |
| 4626 | * in each node depending on the size of each node and how evenly kernelcore |
| 4627 | * is distributed. This helper function adjusts the zone ranges |
| 4628 | * provided by the architecture for a given node by using the end of the |
| 4629 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that |
| 4630 | * zones within a node are in order of monotonic increases memory addresses |
| 4631 | */ |
Adrian Bunk | b69a728 | 2008-07-23 21:28:12 -0700 | [diff] [blame] | 4632 | static void __meminit adjust_zone_range_for_zone_movable(int nid, |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 4633 | unsigned long zone_type, |
| 4634 | unsigned long node_start_pfn, |
| 4635 | unsigned long node_end_pfn, |
| 4636 | unsigned long *zone_start_pfn, |
| 4637 | unsigned long *zone_end_pfn) |
| 4638 | { |
| 4639 | /* Only adjust if ZONE_MOVABLE is on this node */ |
| 4640 | if (zone_movable_pfn[nid]) { |
| 4641 | /* Size ZONE_MOVABLE */ |
| 4642 | if (zone_type == ZONE_MOVABLE) { |
| 4643 | *zone_start_pfn = zone_movable_pfn[nid]; |
| 4644 | *zone_end_pfn = min(node_end_pfn, |
| 4645 | arch_zone_highest_possible_pfn[movable_zone]); |
| 4646 | |
| 4647 | /* Adjust for ZONE_MOVABLE starting within this range */ |
| 4648 | } else if (*zone_start_pfn < zone_movable_pfn[nid] && |
| 4649 | *zone_end_pfn > zone_movable_pfn[nid]) { |
| 4650 | *zone_end_pfn = zone_movable_pfn[nid]; |
| 4651 | |
| 4652 | /* Check if this whole range is within ZONE_MOVABLE */ |
| 4653 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) |
| 4654 | *zone_start_pfn = *zone_end_pfn; |
| 4655 | } |
| 4656 | } |
| 4657 | |
| 4658 | /* |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4659 | * Return the number of pages a zone spans in a node, including holes |
| 4660 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() |
| 4661 | */ |
Paul Mundt | 6ea6e68 | 2007-07-15 23:38:20 -0700 | [diff] [blame] | 4662 | static unsigned long __meminit zone_spanned_pages_in_node(int nid, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4663 | unsigned long zone_type, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4664 | unsigned long node_start_pfn, |
| 4665 | unsigned long node_end_pfn, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4666 | unsigned long *ignored) |
| 4667 | { |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4668 | unsigned long zone_start_pfn, zone_end_pfn; |
| 4669 | |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4670 | /* Get the start and end of the zone */ |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4671 | zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; |
| 4672 | zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 4673 | adjust_zone_range_for_zone_movable(nid, zone_type, |
| 4674 | node_start_pfn, node_end_pfn, |
| 4675 | &zone_start_pfn, &zone_end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4676 | |
| 4677 | /* Check that this node has pages within the zone's required range */ |
| 4678 | if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn) |
| 4679 | return 0; |
| 4680 | |
| 4681 | /* Move the zone boundaries inside the node if necessary */ |
| 4682 | zone_end_pfn = min(zone_end_pfn, node_end_pfn); |
| 4683 | zone_start_pfn = max(zone_start_pfn, node_start_pfn); |
| 4684 | |
| 4685 | /* Return the spanned pages */ |
| 4686 | return zone_end_pfn - zone_start_pfn; |
| 4687 | } |
| 4688 | |
| 4689 | /* |
| 4690 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 4691 | * then all holes in the requested range will be accounted for. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4692 | */ |
Yinghai Lu | 3299625 | 2009-12-15 17:59:02 -0800 | [diff] [blame] | 4693 | unsigned long __meminit __absent_pages_in_range(int nid, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4694 | unsigned long range_start_pfn, |
| 4695 | unsigned long range_end_pfn) |
| 4696 | { |
Tejun Heo | 96e907d | 2011-07-12 10:46:29 +0200 | [diff] [blame] | 4697 | unsigned long nr_absent = range_end_pfn - range_start_pfn; |
| 4698 | unsigned long start_pfn, end_pfn; |
| 4699 | int i; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4700 | |
Tejun Heo | 96e907d | 2011-07-12 10:46:29 +0200 | [diff] [blame] | 4701 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
| 4702 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); |
| 4703 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); |
| 4704 | nr_absent -= end_pfn - start_pfn; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4705 | } |
Tejun Heo | 96e907d | 2011-07-12 10:46:29 +0200 | [diff] [blame] | 4706 | return nr_absent; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4707 | } |
| 4708 | |
| 4709 | /** |
| 4710 | * absent_pages_in_range - Return number of page frames in holes within a range |
| 4711 | * @start_pfn: The start PFN to start searching for holes |
| 4712 | * @end_pfn: The end PFN to stop searching for holes |
| 4713 | * |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 4714 | * It returns the number of pages frames in memory holes within a range. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4715 | */ |
| 4716 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, |
| 4717 | unsigned long end_pfn) |
| 4718 | { |
| 4719 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); |
| 4720 | } |
| 4721 | |
| 4722 | /* Return the number of page frames in holes in a zone on a node */ |
Paul Mundt | 6ea6e68 | 2007-07-15 23:38:20 -0700 | [diff] [blame] | 4723 | static unsigned long __meminit zone_absent_pages_in_node(int nid, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4724 | unsigned long zone_type, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4725 | unsigned long node_start_pfn, |
| 4726 | unsigned long node_end_pfn, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4727 | unsigned long *ignored) |
| 4728 | { |
Tejun Heo | 96e907d | 2011-07-12 10:46:29 +0200 | [diff] [blame] | 4729 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
| 4730 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; |
Mel Gorman | 9c7cd68 | 2006-09-27 01:49:58 -0700 | [diff] [blame] | 4731 | unsigned long zone_start_pfn, zone_end_pfn; |
| 4732 | |
Tejun Heo | 96e907d | 2011-07-12 10:46:29 +0200 | [diff] [blame] | 4733 | zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
| 4734 | zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); |
Mel Gorman | 9c7cd68 | 2006-09-27 01:49:58 -0700 | [diff] [blame] | 4735 | |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 4736 | adjust_zone_range_for_zone_movable(nid, zone_type, |
| 4737 | node_start_pfn, node_end_pfn, |
| 4738 | &zone_start_pfn, &zone_end_pfn); |
Mel Gorman | 9c7cd68 | 2006-09-27 01:49:58 -0700 | [diff] [blame] | 4739 | return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4740 | } |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 4741 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 4742 | #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
Paul Mundt | 6ea6e68 | 2007-07-15 23:38:20 -0700 | [diff] [blame] | 4743 | static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4744 | unsigned long zone_type, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4745 | unsigned long node_start_pfn, |
| 4746 | unsigned long node_end_pfn, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4747 | unsigned long *zones_size) |
| 4748 | { |
| 4749 | return zones_size[zone_type]; |
| 4750 | } |
| 4751 | |
Paul Mundt | 6ea6e68 | 2007-07-15 23:38:20 -0700 | [diff] [blame] | 4752 | static inline unsigned long __meminit zone_absent_pages_in_node(int nid, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4753 | unsigned long zone_type, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4754 | unsigned long node_start_pfn, |
| 4755 | unsigned long node_end_pfn, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4756 | unsigned long *zholes_size) |
| 4757 | { |
| 4758 | if (!zholes_size) |
| 4759 | return 0; |
| 4760 | |
| 4761 | return zholes_size[zone_type]; |
| 4762 | } |
Yinghai Lu | 20e6926 | 2013-03-01 14:51:27 -0800 | [diff] [blame] | 4763 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 4764 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4765 | |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 4766 | static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4767 | unsigned long node_start_pfn, |
| 4768 | unsigned long node_end_pfn, |
| 4769 | unsigned long *zones_size, |
| 4770 | unsigned long *zholes_size) |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4771 | { |
| 4772 | unsigned long realtotalpages, totalpages = 0; |
| 4773 | enum zone_type i; |
| 4774 | |
| 4775 | for (i = 0; i < MAX_NR_ZONES; i++) |
| 4776 | totalpages += zone_spanned_pages_in_node(pgdat->node_id, i, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4777 | node_start_pfn, |
| 4778 | node_end_pfn, |
| 4779 | zones_size); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4780 | pgdat->node_spanned_pages = totalpages; |
| 4781 | |
| 4782 | realtotalpages = totalpages; |
| 4783 | for (i = 0; i < MAX_NR_ZONES; i++) |
| 4784 | realtotalpages -= |
| 4785 | zone_absent_pages_in_node(pgdat->node_id, i, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4786 | node_start_pfn, node_end_pfn, |
| 4787 | zholes_size); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4788 | pgdat->node_present_pages = realtotalpages; |
| 4789 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, |
| 4790 | realtotalpages); |
| 4791 | } |
| 4792 | |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4793 | #ifndef CONFIG_SPARSEMEM |
| 4794 | /* |
| 4795 | * Calculate the size of the zone->blockflags rounded to an unsigned long |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4796 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
| 4797 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4798 | * round what is now in bits to nearest long in bits, then return it in |
| 4799 | * bytes. |
| 4800 | */ |
Linus Torvalds | 7c45512 | 2013-02-18 09:58:02 -0800 | [diff] [blame] | 4801 | static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize) |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4802 | { |
| 4803 | unsigned long usemapsize; |
| 4804 | |
Linus Torvalds | 7c45512 | 2013-02-18 09:58:02 -0800 | [diff] [blame] | 4805 | zonesize += zone_start_pfn & (pageblock_nr_pages-1); |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4806 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
| 4807 | usemapsize = usemapsize >> pageblock_order; |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4808 | usemapsize *= NR_PAGEBLOCK_BITS; |
| 4809 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); |
| 4810 | |
| 4811 | return usemapsize / 8; |
| 4812 | } |
| 4813 | |
| 4814 | static void __init setup_usemap(struct pglist_data *pgdat, |
Linus Torvalds | 7c45512 | 2013-02-18 09:58:02 -0800 | [diff] [blame] | 4815 | struct zone *zone, |
| 4816 | unsigned long zone_start_pfn, |
| 4817 | unsigned long zonesize) |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4818 | { |
Linus Torvalds | 7c45512 | 2013-02-18 09:58:02 -0800 | [diff] [blame] | 4819 | unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize); |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4820 | zone->pageblock_flags = NULL; |
Julia Lawall | 58a01a4 | 2009-01-06 14:39:28 -0800 | [diff] [blame] | 4821 | if (usemapsize) |
Santosh Shilimkar | 6782832 | 2014-01-21 15:50:25 -0800 | [diff] [blame] | 4822 | zone->pageblock_flags = |
| 4823 | memblock_virt_alloc_node_nopanic(usemapsize, |
| 4824 | pgdat->node_id); |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4825 | } |
| 4826 | #else |
Linus Torvalds | 7c45512 | 2013-02-18 09:58:02 -0800 | [diff] [blame] | 4827 | static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone, |
| 4828 | unsigned long zone_start_pfn, unsigned long zonesize) {} |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 4829 | #endif /* CONFIG_SPARSEMEM */ |
| 4830 | |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4831 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
Mel Gorman | ba72cb8 | 2007-11-28 16:21:13 -0800 | [diff] [blame] | 4832 | |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4833 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ |
Chen Gang | 15ca220 | 2013-09-11 14:20:27 -0700 | [diff] [blame] | 4834 | void __paginginit set_pageblock_order(void) |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4835 | { |
Andrew Morton | 955c1cd | 2012-05-29 15:06:31 -0700 | [diff] [blame] | 4836 | unsigned int order; |
| 4837 | |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4838 | /* Check that pageblock_nr_pages has not already been setup */ |
| 4839 | if (pageblock_order) |
| 4840 | return; |
| 4841 | |
Andrew Morton | 955c1cd | 2012-05-29 15:06:31 -0700 | [diff] [blame] | 4842 | if (HPAGE_SHIFT > PAGE_SHIFT) |
| 4843 | order = HUGETLB_PAGE_ORDER; |
| 4844 | else |
| 4845 | order = MAX_ORDER - 1; |
| 4846 | |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4847 | /* |
| 4848 | * Assume the largest contiguous order of interest is a huge page. |
Andrew Morton | 955c1cd | 2012-05-29 15:06:31 -0700 | [diff] [blame] | 4849 | * This value may be variable depending on boot parameters on IA64 and |
| 4850 | * powerpc. |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4851 | */ |
| 4852 | pageblock_order = order; |
| 4853 | } |
| 4854 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ |
| 4855 | |
Mel Gorman | ba72cb8 | 2007-11-28 16:21:13 -0800 | [diff] [blame] | 4856 | /* |
| 4857 | * When CONFIG_HUGETLB_PAGE_SIZE_VARIABLE is not set, set_pageblock_order() |
Andrew Morton | 955c1cd | 2012-05-29 15:06:31 -0700 | [diff] [blame] | 4858 | * is unused as pageblock_order is set at compile-time. See |
| 4859 | * include/linux/pageblock-flags.h for the values of pageblock_order based on |
| 4860 | * the kernel config |
Mel Gorman | ba72cb8 | 2007-11-28 16:21:13 -0800 | [diff] [blame] | 4861 | */ |
Chen Gang | 15ca220 | 2013-09-11 14:20:27 -0700 | [diff] [blame] | 4862 | void __paginginit set_pageblock_order(void) |
Mel Gorman | ba72cb8 | 2007-11-28 16:21:13 -0800 | [diff] [blame] | 4863 | { |
Mel Gorman | ba72cb8 | 2007-11-28 16:21:13 -0800 | [diff] [blame] | 4864 | } |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 4865 | |
| 4866 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ |
| 4867 | |
Jiang Liu | 01cefae | 2012-12-12 13:52:19 -0800 | [diff] [blame] | 4868 | static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages, |
| 4869 | unsigned long present_pages) |
| 4870 | { |
| 4871 | unsigned long pages = spanned_pages; |
| 4872 | |
| 4873 | /* |
| 4874 | * Provide a more accurate estimation if there are holes within |
| 4875 | * the zone and SPARSEMEM is in use. If there are holes within the |
| 4876 | * zone, each populated memory region may cost us one or two extra |
| 4877 | * memmap pages due to alignment because memmap pages for each |
| 4878 | * populated regions may not naturally algined on page boundary. |
| 4879 | * So the (present_pages >> 4) heuristic is a tradeoff for that. |
| 4880 | */ |
| 4881 | if (spanned_pages > present_pages + (present_pages >> 4) && |
| 4882 | IS_ENABLED(CONFIG_SPARSEMEM)) |
| 4883 | pages = present_pages; |
| 4884 | |
| 4885 | return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; |
| 4886 | } |
| 4887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4888 | /* |
| 4889 | * Set up the zone data structures: |
| 4890 | * - mark all pages reserved |
| 4891 | * - mark all memory queues empty |
| 4892 | * - clear the memory bitmaps |
Minchan Kim | 6527af5 | 2012-07-31 16:46:16 -0700 | [diff] [blame] | 4893 | * |
| 4894 | * NOTE: pgdat should get zeroed by caller. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4895 | */ |
Alexander van Heukelum | b5a0e01 | 2008-02-23 15:24:06 -0800 | [diff] [blame] | 4896 | static void __paginginit free_area_init_core(struct pglist_data *pgdat, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4897 | unsigned long node_start_pfn, unsigned long node_end_pfn, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4898 | unsigned long *zones_size, unsigned long *zholes_size) |
| 4899 | { |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 4900 | enum zone_type j; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4901 | int nid = pgdat->node_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4902 | unsigned long zone_start_pfn = pgdat->node_start_pfn; |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4903 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4904 | |
Dave Hansen | 208d54e | 2005-10-29 18:16:52 -0700 | [diff] [blame] | 4905 | pgdat_resize_init(pgdat); |
Andrea Arcangeli | 8177a42 | 2012-03-23 20:56:34 +0100 | [diff] [blame] | 4906 | #ifdef CONFIG_NUMA_BALANCING |
| 4907 | spin_lock_init(&pgdat->numabalancing_migrate_lock); |
| 4908 | pgdat->numabalancing_migrate_nr_pages = 0; |
| 4909 | pgdat->numabalancing_migrate_next_window = jiffies; |
| 4910 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4911 | init_waitqueue_head(&pgdat->kswapd_wait); |
Mel Gorman | 5515061 | 2012-07-31 16:44:35 -0700 | [diff] [blame] | 4912 | init_waitqueue_head(&pgdat->pfmemalloc_wait); |
Joonsoo Kim | eefa864 | 2014-12-12 16:55:46 -0800 | [diff] [blame] | 4913 | pgdat_page_ext_init(pgdat); |
Michal Nazarewicz | 5f63b72 | 2012-01-11 15:16:11 +0100 | [diff] [blame] | 4914 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4915 | for (j = 0; j < MAX_NR_ZONES; j++) { |
| 4916 | struct zone *zone = pgdat->node_zones + j; |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4917 | unsigned long size, realsize, freesize, memmap_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4918 | |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4919 | size = zone_spanned_pages_in_node(nid, j, node_start_pfn, |
| 4920 | node_end_pfn, zones_size); |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4921 | realsize = freesize = size - zone_absent_pages_in_node(nid, j, |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 4922 | node_start_pfn, |
| 4923 | node_end_pfn, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 4924 | zholes_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4925 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 4926 | /* |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4927 | * Adjust freesize so that it accounts for how much memory |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 4928 | * is used by this zone for memmap. This affects the watermark |
| 4929 | * and per-cpu initialisations |
| 4930 | */ |
Jiang Liu | 01cefae | 2012-12-12 13:52:19 -0800 | [diff] [blame] | 4931 | memmap_pages = calc_memmap_size(size, realsize); |
Zhong Hongbo | ba914f4 | 2014-12-12 16:56:21 -0800 | [diff] [blame] | 4932 | if (!is_highmem_idx(j)) { |
| 4933 | if (freesize >= memmap_pages) { |
| 4934 | freesize -= memmap_pages; |
| 4935 | if (memmap_pages) |
| 4936 | printk(KERN_DEBUG |
| 4937 | " %s zone: %lu pages used for memmap\n", |
| 4938 | zone_names[j], memmap_pages); |
| 4939 | } else |
| 4940 | printk(KERN_WARNING |
| 4941 | " %s zone: %lu pages exceeds freesize %lu\n", |
| 4942 | zone_names[j], memmap_pages, freesize); |
| 4943 | } |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 4944 | |
Christoph Lameter | 6267276 | 2007-02-10 01:43:07 -0800 | [diff] [blame] | 4945 | /* Account for reserved pages */ |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4946 | if (j == 0 && freesize > dma_reserve) { |
| 4947 | freesize -= dma_reserve; |
Yinghai Lu | d903ef9 | 2008-10-18 20:27:06 -0700 | [diff] [blame] | 4948 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
Christoph Lameter | 6267276 | 2007-02-10 01:43:07 -0800 | [diff] [blame] | 4949 | zone_names[0], dma_reserve); |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 4950 | } |
| 4951 | |
Christoph Lameter | 98d2b0e | 2006-09-25 23:31:12 -0700 | [diff] [blame] | 4952 | if (!is_highmem_idx(j)) |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4953 | nr_kernel_pages += freesize; |
Jiang Liu | 01cefae | 2012-12-12 13:52:19 -0800 | [diff] [blame] | 4954 | /* Charge for highmem memmap if there are enough kernel pages */ |
| 4955 | else if (nr_kernel_pages > memmap_pages * 2) |
| 4956 | nr_kernel_pages -= memmap_pages; |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4957 | nr_all_pages += freesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4958 | |
| 4959 | zone->spanned_pages = size; |
Jiang Liu | 306f2e9 | 2013-02-22 16:33:54 -0800 | [diff] [blame] | 4960 | zone->present_pages = realsize; |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4961 | /* |
| 4962 | * Set an approximate value for lowmem here, it will be adjusted |
| 4963 | * when the bootmem allocator frees pages into the buddy system. |
| 4964 | * And all highmem pages will be managed by the buddy system. |
| 4965 | */ |
| 4966 | zone->managed_pages = is_highmem_idx(j) ? realsize : freesize; |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 4967 | #ifdef CONFIG_NUMA |
Christoph Lameter | d5f541e | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 4968 | zone->node = nid; |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4969 | zone->min_unmapped_pages = (freesize*sysctl_min_unmapped_ratio) |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 4970 | / 100; |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 4971 | zone->min_slab_pages = (freesize * sysctl_min_slab_ratio) / 100; |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 4972 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4973 | zone->name = zone_names[j]; |
| 4974 | spin_lock_init(&zone->lock); |
| 4975 | spin_lock_init(&zone->lru_lock); |
Dave Hansen | bdc8cb9 | 2005-10-29 18:16:53 -0700 | [diff] [blame] | 4976 | zone_seqlock_init(zone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4977 | zone->zone_pgdat = pgdat; |
Dave Hansen | ed8ece2 | 2005-10-29 18:16:50 -0700 | [diff] [blame] | 4978 | zone_pcp_init(zone); |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 4979 | |
| 4980 | /* For bootup, initialized properly in watermark setup */ |
| 4981 | mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages); |
| 4982 | |
Hugh Dickins | bea8c15 | 2012-11-16 14:14:54 -0800 | [diff] [blame] | 4983 | lruvec_init(&zone->lruvec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4984 | if (!size) |
| 4985 | continue; |
| 4986 | |
Andrew Morton | 955c1cd | 2012-05-29 15:06:31 -0700 | [diff] [blame] | 4987 | set_pageblock_order(); |
Linus Torvalds | 7c45512 | 2013-02-18 09:58:02 -0800 | [diff] [blame] | 4988 | setup_usemap(pgdat, zone, zone_start_pfn, size); |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 4989 | ret = init_currently_empty_zone(zone, zone_start_pfn, |
| 4990 | size, MEMMAP_EARLY); |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 4991 | BUG_ON(ret); |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 4992 | memmap_init(size, nid, j, zone_start_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4993 | zone_start_pfn += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4994 | } |
| 4995 | } |
| 4996 | |
Sam Ravnborg | 577a32f | 2007-05-17 23:29:25 +0200 | [diff] [blame] | 4997 | static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4998 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4999 | /* Skip empty nodes */ |
| 5000 | if (!pgdat->node_spanned_pages) |
| 5001 | return; |
| 5002 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 5003 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5004 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
| 5005 | if (!pgdat->node_mem_map) { |
Bob Picco | e984bb4 | 2006-05-20 15:00:31 -0700 | [diff] [blame] | 5006 | unsigned long size, start, end; |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 5007 | struct page *map; |
| 5008 | |
Bob Picco | e984bb4 | 2006-05-20 15:00:31 -0700 | [diff] [blame] | 5009 | /* |
| 5010 | * The zone's endpoints aren't required to be MAX_ORDER |
| 5011 | * aligned but the node_mem_map endpoints must be in order |
| 5012 | * for the buddy allocator to function correctly. |
| 5013 | */ |
| 5014 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 5015 | end = pgdat_end_pfn(pgdat); |
Bob Picco | e984bb4 | 2006-05-20 15:00:31 -0700 | [diff] [blame] | 5016 | end = ALIGN(end, MAX_ORDER_NR_PAGES); |
| 5017 | size = (end - start) * sizeof(struct page); |
Dave Hansen | 6f167ec | 2005-06-23 00:07:39 -0700 | [diff] [blame] | 5018 | map = alloc_remap(pgdat->node_id, size); |
| 5019 | if (!map) |
Santosh Shilimkar | 6782832 | 2014-01-21 15:50:25 -0800 | [diff] [blame] | 5020 | map = memblock_virt_alloc_node_nopanic(size, |
| 5021 | pgdat->node_id); |
Bob Picco | e984bb4 | 2006-05-20 15:00:31 -0700 | [diff] [blame] | 5022 | pgdat->node_mem_map = map + (pgdat->node_start_pfn - start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5023 | } |
Roman Zippel | 12d810c | 2007-05-31 00:40:54 -0700 | [diff] [blame] | 5024 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5025 | /* |
| 5026 | * With no DISCONTIG, the global mem_map is just set as node 0's |
| 5027 | */ |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5028 | if (pgdat == NODE_DATA(0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5029 | mem_map = NODE_DATA(0)->node_mem_map; |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 5030 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5031 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) |
Thomas Bogendoerfer | 467bc46 | 2008-01-08 15:33:11 -0800 | [diff] [blame] | 5032 | mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET); |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 5033 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5034 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5035 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 5036 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5037 | } |
| 5038 | |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 5039 | void __paginginit free_area_init_node(int nid, unsigned long *zones_size, |
| 5040 | unsigned long node_start_pfn, unsigned long *zholes_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5041 | { |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 5042 | pg_data_t *pgdat = NODE_DATA(nid); |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 5043 | unsigned long start_pfn = 0; |
| 5044 | unsigned long end_pfn = 0; |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 5045 | |
Minchan Kim | 88fdf75 | 2012-07-31 16:46:14 -0700 | [diff] [blame] | 5046 | /* pg_data_t should be reset to zero when it's allocated */ |
Linus Torvalds | 8783b6e | 2012-08-02 10:37:03 -0700 | [diff] [blame] | 5047 | WARN_ON(pgdat->nr_zones || pgdat->classzone_idx); |
Minchan Kim | 88fdf75 | 2012-07-31 16:46:14 -0700 | [diff] [blame] | 5048 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5049 | pgdat->node_id = nid; |
| 5050 | pgdat->node_start_pfn = node_start_pfn; |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 5051 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
| 5052 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); |
Juergen Gross | 8d29e18 | 2015-02-11 15:26:01 -0800 | [diff] [blame] | 5053 | pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid, |
| 5054 | (u64)start_pfn << PAGE_SHIFT, ((u64)end_pfn << PAGE_SHIFT) - 1); |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 5055 | #endif |
| 5056 | calculate_node_totalpages(pgdat, start_pfn, end_pfn, |
| 5057 | zones_size, zholes_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5058 | |
| 5059 | alloc_node_mem_map(pgdat); |
Yinghai Lu | e8c27ac | 2008-06-01 13:15:22 -0700 | [diff] [blame] | 5060 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
| 5061 | printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n", |
| 5062 | nid, (unsigned long)pgdat, |
| 5063 | (unsigned long)pgdat->node_mem_map); |
| 5064 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5065 | |
Zhang Yanfei | 7960aed | 2013-07-08 15:59:52 -0700 | [diff] [blame] | 5066 | free_area_init_core(pgdat, start_pfn, end_pfn, |
| 5067 | zones_size, zholes_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5068 | } |
| 5069 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 5070 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
Miklos Szeredi | 418508c | 2007-05-23 13:57:55 -0700 | [diff] [blame] | 5071 | |
| 5072 | #if MAX_NUMNODES > 1 |
| 5073 | /* |
| 5074 | * Figure out the number of possible node ids. |
| 5075 | */ |
Cody P Schafer | f9872ca | 2013-04-29 15:08:01 -0700 | [diff] [blame] | 5076 | void __init setup_nr_node_ids(void) |
Miklos Szeredi | 418508c | 2007-05-23 13:57:55 -0700 | [diff] [blame] | 5077 | { |
| 5078 | unsigned int node; |
| 5079 | unsigned int highest = 0; |
| 5080 | |
| 5081 | for_each_node_mask(node, node_possible_map) |
| 5082 | highest = node; |
| 5083 | nr_node_ids = highest + 1; |
| 5084 | } |
Miklos Szeredi | 418508c | 2007-05-23 13:57:55 -0700 | [diff] [blame] | 5085 | #endif |
| 5086 | |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5087 | /** |
Tejun Heo | 1e01979 | 2011-07-12 09:45:34 +0200 | [diff] [blame] | 5088 | * node_map_pfn_alignment - determine the maximum internode alignment |
| 5089 | * |
| 5090 | * This function should be called after node map is populated and sorted. |
| 5091 | * It calculates the maximum power of two alignment which can distinguish |
| 5092 | * all the nodes. |
| 5093 | * |
| 5094 | * For example, if all nodes are 1GiB and aligned to 1GiB, the return value |
| 5095 | * would indicate 1GiB alignment with (1 << (30 - PAGE_SHIFT)). If the |
| 5096 | * nodes are shifted by 256MiB, 256MiB. Note that if only the last node is |
| 5097 | * shifted, 1GiB is enough and this function will indicate so. |
| 5098 | * |
| 5099 | * This is used to test whether pfn -> nid mapping of the chosen memory |
| 5100 | * model has fine enough granularity to avoid incorrect mapping for the |
| 5101 | * populated node map. |
| 5102 | * |
| 5103 | * Returns the determined alignment in pfn's. 0 if there is no alignment |
| 5104 | * requirement (single node). |
| 5105 | */ |
| 5106 | unsigned long __init node_map_pfn_alignment(void) |
| 5107 | { |
| 5108 | unsigned long accl_mask = 0, last_end = 0; |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5109 | unsigned long start, end, mask; |
Tejun Heo | 1e01979 | 2011-07-12 09:45:34 +0200 | [diff] [blame] | 5110 | int last_nid = -1; |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5111 | int i, nid; |
Tejun Heo | 1e01979 | 2011-07-12 09:45:34 +0200 | [diff] [blame] | 5112 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5113 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) { |
Tejun Heo | 1e01979 | 2011-07-12 09:45:34 +0200 | [diff] [blame] | 5114 | if (!start || last_nid < 0 || last_nid == nid) { |
| 5115 | last_nid = nid; |
| 5116 | last_end = end; |
| 5117 | continue; |
| 5118 | } |
| 5119 | |
| 5120 | /* |
| 5121 | * Start with a mask granular enough to pin-point to the |
| 5122 | * start pfn and tick off bits one-by-one until it becomes |
| 5123 | * too coarse to separate the current node from the last. |
| 5124 | */ |
| 5125 | mask = ~((1 << __ffs(start)) - 1); |
| 5126 | while (mask && last_end <= (start & (mask << 1))) |
| 5127 | mask <<= 1; |
| 5128 | |
| 5129 | /* accumulate all internode masks */ |
| 5130 | accl_mask |= mask; |
| 5131 | } |
| 5132 | |
| 5133 | /* convert mask to number of pages */ |
| 5134 | return ~accl_mask + 1; |
| 5135 | } |
| 5136 | |
Mel Gorman | a6af2bc | 2007-02-10 01:42:57 -0800 | [diff] [blame] | 5137 | /* Find the lowest pfn for a node */ |
Adrian Bunk | b69a728 | 2008-07-23 21:28:12 -0700 | [diff] [blame] | 5138 | static unsigned long __init find_min_pfn_for_node(int nid) |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5139 | { |
Mel Gorman | a6af2bc | 2007-02-10 01:42:57 -0800 | [diff] [blame] | 5140 | unsigned long min_pfn = ULONG_MAX; |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5141 | unsigned long start_pfn; |
| 5142 | int i; |
Mel Gorman | 1abbfb4 | 2006-11-23 12:01:41 +0000 | [diff] [blame] | 5143 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5144 | for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL) |
| 5145 | min_pfn = min(min_pfn, start_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5146 | |
Mel Gorman | a6af2bc | 2007-02-10 01:42:57 -0800 | [diff] [blame] | 5147 | if (min_pfn == ULONG_MAX) { |
| 5148 | printk(KERN_WARNING |
Paul Jackson | 2bc0d26 | 2008-06-22 07:22:17 -0700 | [diff] [blame] | 5149 | "Could not find start_pfn for node %d\n", nid); |
Mel Gorman | a6af2bc | 2007-02-10 01:42:57 -0800 | [diff] [blame] | 5150 | return 0; |
| 5151 | } |
| 5152 | |
| 5153 | return min_pfn; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5154 | } |
| 5155 | |
| 5156 | /** |
| 5157 | * find_min_pfn_with_active_regions - Find the minimum PFN registered |
| 5158 | * |
| 5159 | * It returns the minimum PFN based on information provided via |
Zhang Zhen | 7d01817 | 2014-06-04 16:10:53 -0700 | [diff] [blame] | 5160 | * memblock_set_node(). |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5161 | */ |
| 5162 | unsigned long __init find_min_pfn_with_active_regions(void) |
| 5163 | { |
| 5164 | return find_min_pfn_for_node(MAX_NUMNODES); |
| 5165 | } |
| 5166 | |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5167 | /* |
| 5168 | * early_calculate_totalpages() |
| 5169 | * Sum pages in active regions for movable zone. |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5170 | * Populate N_MEMORY for calculating usable_nodes. |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5171 | */ |
Adrian Bunk | 484f51f | 2007-10-16 01:26:03 -0700 | [diff] [blame] | 5172 | static unsigned long __init early_calculate_totalpages(void) |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5173 | { |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5174 | unsigned long totalpages = 0; |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5175 | unsigned long start_pfn, end_pfn; |
| 5176 | int i, nid; |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5177 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5178 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { |
| 5179 | unsigned long pages = end_pfn - start_pfn; |
| 5180 | |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5181 | totalpages += pages; |
| 5182 | if (pages) |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5183 | node_set_state(nid, N_MEMORY); |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5184 | } |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 5185 | return totalpages; |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5186 | } |
| 5187 | |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5188 | /* |
| 5189 | * Find the PFN the Movable zone begins in each node. Kernel memory |
| 5190 | * is spread evenly between nodes as long as the nodes have enough |
| 5191 | * memory. When they don't, some nodes will have more kernelcore than |
| 5192 | * others |
| 5193 | */ |
Kautuk Consul | b224ef8 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 5194 | static void __init find_zone_movable_pfns_for_nodes(void) |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5195 | { |
| 5196 | int i, nid; |
| 5197 | unsigned long usable_startpfn; |
| 5198 | unsigned long kernelcore_node, kernelcore_remaining; |
Yinghai Lu | 66918dc | 2009-06-30 11:41:37 -0700 | [diff] [blame] | 5199 | /* save the state before borrow the nodemask */ |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5200 | nodemask_t saved_node_state = node_states[N_MEMORY]; |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5201 | unsigned long totalpages = early_calculate_totalpages(); |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5202 | int usable_nodes = nodes_weight(node_states[N_MEMORY]); |
Emil Medve | 136199f | 2014-04-07 15:37:52 -0700 | [diff] [blame] | 5203 | struct memblock_region *r; |
Tang Chen | b2f3eeb | 2014-01-21 15:49:38 -0800 | [diff] [blame] | 5204 | |
| 5205 | /* Need to find movable_zone earlier when movable_node is specified. */ |
| 5206 | find_usable_zone_for_movable(); |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5207 | |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5208 | /* |
Tang Chen | b2f3eeb | 2014-01-21 15:49:38 -0800 | [diff] [blame] | 5209 | * If movable_node is specified, ignore kernelcore and movablecore |
| 5210 | * options. |
| 5211 | */ |
| 5212 | if (movable_node_is_enabled()) { |
Emil Medve | 136199f | 2014-04-07 15:37:52 -0700 | [diff] [blame] | 5213 | for_each_memblock(memory, r) { |
| 5214 | if (!memblock_is_hotpluggable(r)) |
Tang Chen | b2f3eeb | 2014-01-21 15:49:38 -0800 | [diff] [blame] | 5215 | continue; |
| 5216 | |
Emil Medve | 136199f | 2014-04-07 15:37:52 -0700 | [diff] [blame] | 5217 | nid = r->nid; |
Tang Chen | b2f3eeb | 2014-01-21 15:49:38 -0800 | [diff] [blame] | 5218 | |
Emil Medve | 136199f | 2014-04-07 15:37:52 -0700 | [diff] [blame] | 5219 | usable_startpfn = PFN_DOWN(r->base); |
Tang Chen | b2f3eeb | 2014-01-21 15:49:38 -0800 | [diff] [blame] | 5220 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? |
| 5221 | min(usable_startpfn, zone_movable_pfn[nid]) : |
| 5222 | usable_startpfn; |
| 5223 | } |
| 5224 | |
| 5225 | goto out2; |
| 5226 | } |
| 5227 | |
| 5228 | /* |
| 5229 | * If movablecore=nn[KMG] was specified, calculate what size of |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5230 | * kernelcore that corresponds so that memory usable for |
| 5231 | * any allocation type is evenly spread. If both kernelcore |
| 5232 | * and movablecore are specified, then the value of kernelcore |
| 5233 | * will be used for required_kernelcore if it's greater than |
| 5234 | * what movablecore would have allowed. |
| 5235 | */ |
| 5236 | if (required_movablecore) { |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5237 | unsigned long corepages; |
| 5238 | |
| 5239 | /* |
| 5240 | * Round-up so that ZONE_MOVABLE is at least as large as what |
| 5241 | * was requested by the user |
| 5242 | */ |
| 5243 | required_movablecore = |
| 5244 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); |
| 5245 | corepages = totalpages - required_movablecore; |
| 5246 | |
| 5247 | required_kernelcore = max(required_kernelcore, corepages); |
| 5248 | } |
| 5249 | |
Yinghai Lu | 20e6926 | 2013-03-01 14:51:27 -0800 | [diff] [blame] | 5250 | /* If kernelcore was not specified, there is no ZONE_MOVABLE */ |
| 5251 | if (!required_kernelcore) |
Yinghai Lu | 66918dc | 2009-06-30 11:41:37 -0700 | [diff] [blame] | 5252 | goto out; |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5253 | |
| 5254 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5255 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; |
| 5256 | |
| 5257 | restart: |
| 5258 | /* Spread kernelcore memory as evenly as possible throughout nodes */ |
| 5259 | kernelcore_node = required_kernelcore / usable_nodes; |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5260 | for_each_node_state(nid, N_MEMORY) { |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5261 | unsigned long start_pfn, end_pfn; |
| 5262 | |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5263 | /* |
| 5264 | * Recalculate kernelcore_node if the division per node |
| 5265 | * now exceeds what is necessary to satisfy the requested |
| 5266 | * amount of memory for the kernel |
| 5267 | */ |
| 5268 | if (required_kernelcore < kernelcore_node) |
| 5269 | kernelcore_node = required_kernelcore / usable_nodes; |
| 5270 | |
| 5271 | /* |
| 5272 | * As the map is walked, we track how much memory is usable |
| 5273 | * by the kernel using kernelcore_remaining. When it is |
| 5274 | * 0, the rest of the node is usable by ZONE_MOVABLE |
| 5275 | */ |
| 5276 | kernelcore_remaining = kernelcore_node; |
| 5277 | |
| 5278 | /* Go through each range of PFNs within this node */ |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5279 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5280 | unsigned long size_pages; |
| 5281 | |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5282 | start_pfn = max(start_pfn, zone_movable_pfn[nid]); |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5283 | if (start_pfn >= end_pfn) |
| 5284 | continue; |
| 5285 | |
| 5286 | /* Account for what is only usable for kernelcore */ |
| 5287 | if (start_pfn < usable_startpfn) { |
| 5288 | unsigned long kernel_pages; |
| 5289 | kernel_pages = min(end_pfn, usable_startpfn) |
| 5290 | - start_pfn; |
| 5291 | |
| 5292 | kernelcore_remaining -= min(kernel_pages, |
| 5293 | kernelcore_remaining); |
| 5294 | required_kernelcore -= min(kernel_pages, |
| 5295 | required_kernelcore); |
| 5296 | |
| 5297 | /* Continue if range is now fully accounted */ |
| 5298 | if (end_pfn <= usable_startpfn) { |
| 5299 | |
| 5300 | /* |
| 5301 | * Push zone_movable_pfn to the end so |
| 5302 | * that if we have to rebalance |
| 5303 | * kernelcore across nodes, we will |
| 5304 | * not double account here |
| 5305 | */ |
| 5306 | zone_movable_pfn[nid] = end_pfn; |
| 5307 | continue; |
| 5308 | } |
| 5309 | start_pfn = usable_startpfn; |
| 5310 | } |
| 5311 | |
| 5312 | /* |
| 5313 | * The usable PFN range for ZONE_MOVABLE is from |
| 5314 | * start_pfn->end_pfn. Calculate size_pages as the |
| 5315 | * number of pages used as kernelcore |
| 5316 | */ |
| 5317 | size_pages = end_pfn - start_pfn; |
| 5318 | if (size_pages > kernelcore_remaining) |
| 5319 | size_pages = kernelcore_remaining; |
| 5320 | zone_movable_pfn[nid] = start_pfn + size_pages; |
| 5321 | |
| 5322 | /* |
| 5323 | * Some kernelcore has been met, update counts and |
| 5324 | * break if the kernelcore for this node has been |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 5325 | * satisfied |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5326 | */ |
| 5327 | required_kernelcore -= min(required_kernelcore, |
| 5328 | size_pages); |
| 5329 | kernelcore_remaining -= size_pages; |
| 5330 | if (!kernelcore_remaining) |
| 5331 | break; |
| 5332 | } |
| 5333 | } |
| 5334 | |
| 5335 | /* |
| 5336 | * If there is still required_kernelcore, we do another pass with one |
| 5337 | * less node in the count. This will push zone_movable_pfn[nid] further |
| 5338 | * along on the nodes that still have memory until kernelcore is |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 5339 | * satisfied |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5340 | */ |
| 5341 | usable_nodes--; |
| 5342 | if (usable_nodes && required_kernelcore > usable_nodes) |
| 5343 | goto restart; |
| 5344 | |
Tang Chen | b2f3eeb | 2014-01-21 15:49:38 -0800 | [diff] [blame] | 5345 | out2: |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5346 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ |
| 5347 | for (nid = 0; nid < MAX_NUMNODES; nid++) |
| 5348 | zone_movable_pfn[nid] = |
| 5349 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); |
Yinghai Lu | 66918dc | 2009-06-30 11:41:37 -0700 | [diff] [blame] | 5350 | |
Yinghai Lu | 20e6926 | 2013-03-01 14:51:27 -0800 | [diff] [blame] | 5351 | out: |
Yinghai Lu | 66918dc | 2009-06-30 11:41:37 -0700 | [diff] [blame] | 5352 | /* restore the node_state */ |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5353 | node_states[N_MEMORY] = saved_node_state; |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5354 | } |
| 5355 | |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5356 | /* Any regular or high memory on that node ? */ |
| 5357 | static void check_for_memory(pg_data_t *pgdat, int nid) |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5358 | { |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5359 | enum zone_type zone_type; |
| 5360 | |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5361 | if (N_MEMORY == N_NORMAL_MEMORY) |
| 5362 | return; |
| 5363 | |
| 5364 | for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) { |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5365 | struct zone *zone = &pgdat->node_zones[zone_type]; |
Xishi Qiu | b38a872 | 2013-11-12 15:07:20 -0800 | [diff] [blame] | 5366 | if (populated_zone(zone)) { |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5367 | node_set_state(nid, N_HIGH_MEMORY); |
| 5368 | if (N_NORMAL_MEMORY != N_HIGH_MEMORY && |
| 5369 | zone_type <= ZONE_NORMAL) |
| 5370 | node_set_state(nid, N_NORMAL_MEMORY); |
Bob Liu | d0048b0 | 2012-01-12 17:19:07 -0800 | [diff] [blame] | 5371 | break; |
| 5372 | } |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5373 | } |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5374 | } |
| 5375 | |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5376 | /** |
| 5377 | * free_area_init_nodes - Initialise all pg_data_t and zone data |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 5378 | * @max_zone_pfn: an array of max PFNs for each zone |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5379 | * |
| 5380 | * This will call free_area_init_node() for each active node in the system. |
Zhang Zhen | 7d01817 | 2014-06-04 16:10:53 -0700 | [diff] [blame] | 5381 | * Using the page ranges provided by memblock_set_node(), the size of each |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5382 | * zone in each node and their holes is calculated. If the maximum PFN |
| 5383 | * between two adjacent zones match, it is assumed that the zone is empty. |
| 5384 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed |
| 5385 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone |
| 5386 | * starts where the previous one ended. For example, ZONE_DMA32 starts |
| 5387 | * at arch_max_dma_pfn. |
| 5388 | */ |
| 5389 | void __init free_area_init_nodes(unsigned long *max_zone_pfn) |
| 5390 | { |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5391 | unsigned long start_pfn, end_pfn; |
| 5392 | int i, nid; |
Mel Gorman | a6af2bc | 2007-02-10 01:42:57 -0800 | [diff] [blame] | 5393 | |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5394 | /* Record where the zone boundaries are */ |
| 5395 | memset(arch_zone_lowest_possible_pfn, 0, |
| 5396 | sizeof(arch_zone_lowest_possible_pfn)); |
| 5397 | memset(arch_zone_highest_possible_pfn, 0, |
| 5398 | sizeof(arch_zone_highest_possible_pfn)); |
| 5399 | arch_zone_lowest_possible_pfn[0] = find_min_pfn_with_active_regions(); |
| 5400 | arch_zone_highest_possible_pfn[0] = max_zone_pfn[0]; |
| 5401 | for (i = 1; i < MAX_NR_ZONES; i++) { |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5402 | if (i == ZONE_MOVABLE) |
| 5403 | continue; |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5404 | arch_zone_lowest_possible_pfn[i] = |
| 5405 | arch_zone_highest_possible_pfn[i-1]; |
| 5406 | arch_zone_highest_possible_pfn[i] = |
| 5407 | max(max_zone_pfn[i], arch_zone_lowest_possible_pfn[i]); |
| 5408 | } |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5409 | arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0; |
| 5410 | arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0; |
| 5411 | |
| 5412 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ |
| 5413 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); |
Kautuk Consul | b224ef8 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 5414 | find_zone_movable_pfns_for_nodes(); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5415 | |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5416 | /* Print out the zone ranges */ |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 5417 | pr_info("Zone ranges:\n"); |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5418 | for (i = 0; i < MAX_NR_ZONES; i++) { |
| 5419 | if (i == ZONE_MOVABLE) |
| 5420 | continue; |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 5421 | pr_info(" %-8s ", zone_names[i]); |
David Rientjes | 72f0ba0 | 2010-03-05 13:42:14 -0800 | [diff] [blame] | 5422 | if (arch_zone_lowest_possible_pfn[i] == |
| 5423 | arch_zone_highest_possible_pfn[i]) |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 5424 | pr_cont("empty\n"); |
David Rientjes | 72f0ba0 | 2010-03-05 13:42:14 -0800 | [diff] [blame] | 5425 | else |
Juergen Gross | 8d29e18 | 2015-02-11 15:26:01 -0800 | [diff] [blame] | 5426 | pr_cont("[mem %#018Lx-%#018Lx]\n", |
| 5427 | (u64)arch_zone_lowest_possible_pfn[i] |
| 5428 | << PAGE_SHIFT, |
| 5429 | ((u64)arch_zone_highest_possible_pfn[i] |
Bjorn Helgaas | a62e2f4 | 2012-05-29 15:06:30 -0700 | [diff] [blame] | 5430 | << PAGE_SHIFT) - 1); |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5431 | } |
| 5432 | |
| 5433 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 5434 | pr_info("Movable zone start for each node\n"); |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5435 | for (i = 0; i < MAX_NUMNODES; i++) { |
| 5436 | if (zone_movable_pfn[i]) |
Juergen Gross | 8d29e18 | 2015-02-11 15:26:01 -0800 | [diff] [blame] | 5437 | pr_info(" Node %d: %#018Lx\n", i, |
| 5438 | (u64)zone_movable_pfn[i] << PAGE_SHIFT); |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5439 | } |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5440 | |
Wanpeng Li | f2d52fe | 2012-10-08 16:32:24 -0700 | [diff] [blame] | 5441 | /* Print out the early node map */ |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 5442 | pr_info("Early memory node ranges\n"); |
Tejun Heo | c13291a | 2011-07-12 10:46:30 +0200 | [diff] [blame] | 5443 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) |
Juergen Gross | 8d29e18 | 2015-02-11 15:26:01 -0800 | [diff] [blame] | 5444 | pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, |
| 5445 | (u64)start_pfn << PAGE_SHIFT, |
| 5446 | ((u64)end_pfn << PAGE_SHIFT) - 1); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5447 | |
| 5448 | /* Initialise every node */ |
Mel Gorman | 708614e | 2008-07-23 21:26:51 -0700 | [diff] [blame] | 5449 | mminit_verify_pageflags_layout(); |
Christoph Lameter | 8ef8286 | 2007-02-20 13:57:52 -0800 | [diff] [blame] | 5450 | setup_nr_node_ids(); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5451 | for_each_online_node(nid) { |
| 5452 | pg_data_t *pgdat = NODE_DATA(nid); |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 5453 | free_area_init_node(nid, NULL, |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5454 | find_min_pfn_for_node(nid), NULL); |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 5455 | |
| 5456 | /* Any memory on that node */ |
| 5457 | if (pgdat->node_present_pages) |
Lai Jiangshan | 4b0ef1fe | 2012-12-12 13:51:46 -0800 | [diff] [blame] | 5458 | node_set_state(nid, N_MEMORY); |
| 5459 | check_for_memory(pgdat, nid); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5460 | } |
| 5461 | } |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5462 | |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5463 | static int __init cmdline_parse_core(char *p, unsigned long *core) |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5464 | { |
| 5465 | unsigned long long coremem; |
| 5466 | if (!p) |
| 5467 | return -EINVAL; |
| 5468 | |
| 5469 | coremem = memparse(p, &p); |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5470 | *core = coremem >> PAGE_SHIFT; |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5471 | |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5472 | /* Paranoid check that UL is enough for the coremem value */ |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 5473 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); |
| 5474 | |
| 5475 | return 0; |
| 5476 | } |
Mel Gorman | ed7ed36 | 2007-07-17 04:03:14 -0700 | [diff] [blame] | 5477 | |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5478 | /* |
| 5479 | * kernelcore=size sets the amount of memory for use for allocations that |
| 5480 | * cannot be reclaimed or migrated. |
| 5481 | */ |
| 5482 | static int __init cmdline_parse_kernelcore(char *p) |
| 5483 | { |
| 5484 | return cmdline_parse_core(p, &required_kernelcore); |
| 5485 | } |
| 5486 | |
| 5487 | /* |
| 5488 | * movablecore=size sets the amount of memory for use for allocations that |
| 5489 | * can be reclaimed or migrated. |
| 5490 | */ |
| 5491 | static int __init cmdline_parse_movablecore(char *p) |
| 5492 | { |
| 5493 | return cmdline_parse_core(p, &required_movablecore); |
| 5494 | } |
| 5495 | |
Mel Gorman | ed7ed36 | 2007-07-17 04:03:14 -0700 | [diff] [blame] | 5496 | early_param("kernelcore", cmdline_parse_kernelcore); |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 5497 | early_param("movablecore", cmdline_parse_movablecore); |
Mel Gorman | ed7ed36 | 2007-07-17 04:03:14 -0700 | [diff] [blame] | 5498 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 5499 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 5500 | |
Jiang Liu | c3d5f5f | 2013-07-03 15:03:14 -0700 | [diff] [blame] | 5501 | void adjust_managed_page_count(struct page *page, long count) |
| 5502 | { |
| 5503 | spin_lock(&managed_page_count_lock); |
| 5504 | page_zone(page)->managed_pages += count; |
| 5505 | totalram_pages += count; |
Jiang Liu | 3dcc057 | 2013-07-03 15:03:21 -0700 | [diff] [blame] | 5506 | #ifdef CONFIG_HIGHMEM |
| 5507 | if (PageHighMem(page)) |
| 5508 | totalhigh_pages += count; |
| 5509 | #endif |
Jiang Liu | c3d5f5f | 2013-07-03 15:03:14 -0700 | [diff] [blame] | 5510 | spin_unlock(&managed_page_count_lock); |
| 5511 | } |
Jiang Liu | 3dcc057 | 2013-07-03 15:03:21 -0700 | [diff] [blame] | 5512 | EXPORT_SYMBOL(adjust_managed_page_count); |
Jiang Liu | c3d5f5f | 2013-07-03 15:03:14 -0700 | [diff] [blame] | 5513 | |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 5514 | unsigned long free_reserved_area(void *start, void *end, int poison, char *s) |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 5515 | { |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 5516 | void *pos; |
| 5517 | unsigned long pages = 0; |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 5518 | |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 5519 | start = (void *)PAGE_ALIGN((unsigned long)start); |
| 5520 | end = (void *)((unsigned long)end & PAGE_MASK); |
| 5521 | for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { |
Jiang Liu | dbe67df | 2013-07-03 15:02:51 -0700 | [diff] [blame] | 5522 | if ((unsigned int)poison <= 0xFF) |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 5523 | memset(pos, poison, PAGE_SIZE); |
| 5524 | free_reserved_page(virt_to_page(pos)); |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 5525 | } |
| 5526 | |
| 5527 | if (pages && s) |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 5528 | pr_info("Freeing %s memory: %ldK (%p - %p)\n", |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 5529 | s, pages << (PAGE_SHIFT - 10), start, end); |
| 5530 | |
| 5531 | return pages; |
| 5532 | } |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 5533 | EXPORT_SYMBOL(free_reserved_area); |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 5534 | |
Jiang Liu | cfa11e0 | 2013-04-29 15:07:00 -0700 | [diff] [blame] | 5535 | #ifdef CONFIG_HIGHMEM |
| 5536 | void free_highmem_page(struct page *page) |
| 5537 | { |
| 5538 | __free_reserved_page(page); |
| 5539 | totalram_pages++; |
Jiang Liu | 7b4b2a0 | 2013-07-03 15:03:11 -0700 | [diff] [blame] | 5540 | page_zone(page)->managed_pages++; |
Jiang Liu | cfa11e0 | 2013-04-29 15:07:00 -0700 | [diff] [blame] | 5541 | totalhigh_pages++; |
| 5542 | } |
| 5543 | #endif |
| 5544 | |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 5545 | |
| 5546 | void __init mem_init_print_info(const char *str) |
| 5547 | { |
| 5548 | unsigned long physpages, codesize, datasize, rosize, bss_size; |
| 5549 | unsigned long init_code_size, init_data_size; |
| 5550 | |
| 5551 | physpages = get_num_physpages(); |
| 5552 | codesize = _etext - _stext; |
| 5553 | datasize = _edata - _sdata; |
| 5554 | rosize = __end_rodata - __start_rodata; |
| 5555 | bss_size = __bss_stop - __bss_start; |
| 5556 | init_data_size = __init_end - __init_begin; |
| 5557 | init_code_size = _einittext - _sinittext; |
| 5558 | |
| 5559 | /* |
| 5560 | * Detect special cases and adjust section sizes accordingly: |
| 5561 | * 1) .init.* may be embedded into .data sections |
| 5562 | * 2) .init.text.* may be out of [__init_begin, __init_end], |
| 5563 | * please refer to arch/tile/kernel/vmlinux.lds.S. |
| 5564 | * 3) .rodata.* may be embedded into .text or .data sections. |
| 5565 | */ |
| 5566 | #define adj_init_size(start, end, size, pos, adj) \ |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 5567 | do { \ |
| 5568 | if (start <= pos && pos < end && size > adj) \ |
| 5569 | size -= adj; \ |
| 5570 | } while (0) |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 5571 | |
| 5572 | adj_init_size(__init_begin, __init_end, init_data_size, |
| 5573 | _sinittext, init_code_size); |
| 5574 | adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size); |
| 5575 | adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size); |
| 5576 | adj_init_size(_stext, _etext, codesize, __start_rodata, rosize); |
| 5577 | adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize); |
| 5578 | |
| 5579 | #undef adj_init_size |
| 5580 | |
Anton Blanchard | f88dfff | 2014-12-10 15:42:53 -0800 | [diff] [blame] | 5581 | pr_info("Memory: %luK/%luK available " |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 5582 | "(%luK kernel code, %luK rwdata, %luK rodata, " |
Pintu Kumar | e48322a | 2014-12-18 16:17:15 -0800 | [diff] [blame] | 5583 | "%luK init, %luK bss, %luK reserved, %luK cma-reserved" |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 5584 | #ifdef CONFIG_HIGHMEM |
| 5585 | ", %luK highmem" |
| 5586 | #endif |
| 5587 | "%s%s)\n", |
| 5588 | nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10), |
| 5589 | codesize >> 10, datasize >> 10, rosize >> 10, |
| 5590 | (init_data_size + init_code_size) >> 10, bss_size >> 10, |
Pintu Kumar | e48322a | 2014-12-18 16:17:15 -0800 | [diff] [blame] | 5591 | (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT-10), |
| 5592 | totalcma_pages << (PAGE_SHIFT-10), |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 5593 | #ifdef CONFIG_HIGHMEM |
| 5594 | totalhigh_pages << (PAGE_SHIFT-10), |
| 5595 | #endif |
| 5596 | str ? ", " : "", str ? str : ""); |
| 5597 | } |
| 5598 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 5599 | /** |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 5600 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
| 5601 | * @new_dma_reserve: The number of pages to mark reserved |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 5602 | * |
| 5603 | * The per-cpu batchsize and zone watermarks are determined by present_pages. |
| 5604 | * In the DMA zone, a significant percentage may be consumed by kernel image |
| 5605 | * and other unfreeable allocations which can skew the watermarks badly. This |
Randy Dunlap | 88ca3b9 | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 5606 | * function may optionally be used to account for unfreeable pages in the |
| 5607 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and |
| 5608 | * smaller per-cpu batchsize. |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 5609 | */ |
| 5610 | void __init set_dma_reserve(unsigned long new_dma_reserve) |
| 5611 | { |
| 5612 | dma_reserve = new_dma_reserve; |
| 5613 | } |
| 5614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5615 | void __init free_area_init(unsigned long *zones_size) |
| 5616 | { |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 5617 | free_area_init_node(0, zones_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5618 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
| 5619 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5621 | static int page_alloc_cpu_notify(struct notifier_block *self, |
| 5622 | unsigned long action, void *hcpu) |
| 5623 | { |
| 5624 | int cpu = (unsigned long)hcpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5625 | |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 5626 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
Konstantin Khlebnikov | f0cb3c7 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 5627 | lru_add_drain_cpu(cpu); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 5628 | drain_pages(cpu); |
| 5629 | |
| 5630 | /* |
| 5631 | * Spill the event counters of the dead processor |
| 5632 | * into the current processors event counters. |
| 5633 | * This artificially elevates the count of the current |
| 5634 | * processor. |
| 5635 | */ |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 5636 | vm_events_fold_cpu(cpu); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 5637 | |
| 5638 | /* |
| 5639 | * Zero the differential counters of the dead processor |
| 5640 | * so that the vm statistics are consistent. |
| 5641 | * |
| 5642 | * This is only okay since the processor is dead and cannot |
| 5643 | * race with what we are doing. |
| 5644 | */ |
Christoph Lameter | 2bb921e | 2013-09-11 14:21:30 -0700 | [diff] [blame] | 5645 | cpu_vm_stats_fold(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5646 | } |
| 5647 | return NOTIFY_OK; |
| 5648 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5649 | |
| 5650 | void __init page_alloc_init(void) |
| 5651 | { |
| 5652 | hotcpu_notifier(page_alloc_cpu_notify, 0); |
| 5653 | } |
| 5654 | |
| 5655 | /* |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5656 | * calculate_totalreserve_pages - called when sysctl_lower_zone_reserve_ratio |
| 5657 | * or min_free_kbytes changes. |
| 5658 | */ |
| 5659 | static void calculate_totalreserve_pages(void) |
| 5660 | { |
| 5661 | struct pglist_data *pgdat; |
| 5662 | unsigned long reserve_pages = 0; |
Christoph Lameter | 2f6726e | 2006-09-25 23:31:18 -0700 | [diff] [blame] | 5663 | enum zone_type i, j; |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5664 | |
| 5665 | for_each_online_pgdat(pgdat) { |
| 5666 | for (i = 0; i < MAX_NR_ZONES; i++) { |
| 5667 | struct zone *zone = pgdat->node_zones + i; |
Mel Gorman | 3484b2d | 2014-08-06 16:07:14 -0700 | [diff] [blame] | 5668 | long max = 0; |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5669 | |
| 5670 | /* Find valid and maximum lowmem_reserve in the zone */ |
| 5671 | for (j = i; j < MAX_NR_ZONES; j++) { |
| 5672 | if (zone->lowmem_reserve[j] > max) |
| 5673 | max = zone->lowmem_reserve[j]; |
| 5674 | } |
| 5675 | |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 5676 | /* we treat the high watermark as reserved pages. */ |
| 5677 | max += high_wmark_pages(zone); |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5678 | |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5679 | if (max > zone->managed_pages) |
| 5680 | max = zone->managed_pages; |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5681 | reserve_pages += max; |
Johannes Weiner | ab8fabd | 2012-01-10 15:07:42 -0800 | [diff] [blame] | 5682 | /* |
| 5683 | * Lowmem reserves are not available to |
| 5684 | * GFP_HIGHUSER page cache allocations and |
| 5685 | * kswapd tries to balance zones to their high |
| 5686 | * watermark. As a result, neither should be |
| 5687 | * regarded as dirtyable memory, to prevent a |
| 5688 | * situation where reclaim has to clean pages |
| 5689 | * in order to balance the zones. |
| 5690 | */ |
| 5691 | zone->dirty_balance_reserve = max; |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5692 | } |
| 5693 | } |
Johannes Weiner | ab8fabd | 2012-01-10 15:07:42 -0800 | [diff] [blame] | 5694 | dirty_balance_reserve = reserve_pages; |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5695 | totalreserve_pages = reserve_pages; |
| 5696 | } |
| 5697 | |
| 5698 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5699 | * setup_per_zone_lowmem_reserve - called whenever |
| 5700 | * sysctl_lower_zone_reserve_ratio changes. Ensures that each zone |
| 5701 | * has a correct pages reserved value, so an adequate number of |
| 5702 | * pages are left in the zone after a successful __alloc_pages(). |
| 5703 | */ |
| 5704 | static void setup_per_zone_lowmem_reserve(void) |
| 5705 | { |
| 5706 | struct pglist_data *pgdat; |
Christoph Lameter | 2f6726e | 2006-09-25 23:31:18 -0700 | [diff] [blame] | 5707 | enum zone_type j, idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5708 | |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 5709 | for_each_online_pgdat(pgdat) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5710 | for (j = 0; j < MAX_NR_ZONES; j++) { |
| 5711 | struct zone *zone = pgdat->node_zones + j; |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5712 | unsigned long managed_pages = zone->managed_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5713 | |
| 5714 | zone->lowmem_reserve[j] = 0; |
| 5715 | |
Christoph Lameter | 2f6726e | 2006-09-25 23:31:18 -0700 | [diff] [blame] | 5716 | idx = j; |
| 5717 | while (idx) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5718 | struct zone *lower_zone; |
| 5719 | |
Christoph Lameter | 2f6726e | 2006-09-25 23:31:18 -0700 | [diff] [blame] | 5720 | idx--; |
| 5721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5722 | if (sysctl_lowmem_reserve_ratio[idx] < 1) |
| 5723 | sysctl_lowmem_reserve_ratio[idx] = 1; |
| 5724 | |
| 5725 | lower_zone = pgdat->node_zones + idx; |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5726 | lower_zone->lowmem_reserve[j] = managed_pages / |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5727 | sysctl_lowmem_reserve_ratio[idx]; |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5728 | managed_pages += lower_zone->managed_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5729 | } |
| 5730 | } |
| 5731 | } |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5732 | |
| 5733 | /* update totalreserve_pages */ |
| 5734 | calculate_totalreserve_pages(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5735 | } |
| 5736 | |
Mel Gorman | cfd3da1 | 2011-04-25 21:36:42 +0000 | [diff] [blame] | 5737 | static void __setup_per_zone_wmarks(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5738 | { |
| 5739 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); |
| 5740 | unsigned long lowmem_pages = 0; |
| 5741 | struct zone *zone; |
| 5742 | unsigned long flags; |
| 5743 | |
| 5744 | /* Calculate total number of !ZONE_HIGHMEM pages */ |
| 5745 | for_each_zone(zone) { |
| 5746 | if (!is_highmem(zone)) |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5747 | lowmem_pages += zone->managed_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5748 | } |
| 5749 | |
| 5750 | for_each_zone(zone) { |
Andrew Morton | ac924c6 | 2006-05-15 09:43:59 -0700 | [diff] [blame] | 5751 | u64 tmp; |
| 5752 | |
Gerald Schaefer | 1125b4e | 2008-10-18 20:27:11 -0700 | [diff] [blame] | 5753 | spin_lock_irqsave(&zone->lock, flags); |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5754 | tmp = (u64)pages_min * zone->managed_pages; |
Andrew Morton | ac924c6 | 2006-05-15 09:43:59 -0700 | [diff] [blame] | 5755 | do_div(tmp, lowmem_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5756 | if (is_highmem(zone)) { |
| 5757 | /* |
Nick Piggin | 669ed17 | 2005-11-13 16:06:45 -0800 | [diff] [blame] | 5758 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
| 5759 | * need highmem pages, so cap pages_min to a small |
| 5760 | * value here. |
| 5761 | * |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 5762 | * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN) |
Yaowei Bai | 42ff270 | 2015-04-14 15:47:14 -0700 | [diff] [blame] | 5763 | * deltas control asynch page reclaim, and so should |
Nick Piggin | 669ed17 | 2005-11-13 16:06:45 -0800 | [diff] [blame] | 5764 | * not be capped for highmem. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5765 | */ |
Andrew Morton | 90ae8d6 | 2013-02-22 16:32:22 -0800 | [diff] [blame] | 5766 | unsigned long min_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5767 | |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5768 | min_pages = zone->managed_pages / 1024; |
Andrew Morton | 90ae8d6 | 2013-02-22 16:32:22 -0800 | [diff] [blame] | 5769 | min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 5770 | zone->watermark[WMARK_MIN] = min_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5771 | } else { |
Nick Piggin | 669ed17 | 2005-11-13 16:06:45 -0800 | [diff] [blame] | 5772 | /* |
| 5773 | * If it's a lowmem zone, reserve a number of pages |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5774 | * proportionate to the zone's size. |
| 5775 | */ |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 5776 | zone->watermark[WMARK_MIN] = tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5777 | } |
| 5778 | |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 5779 | zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2); |
| 5780 | zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1); |
Marek Szyprowski | 49f223a | 2012-01-25 12:49:24 +0100 | [diff] [blame] | 5781 | |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 5782 | __mod_zone_page_state(zone, NR_ALLOC_BATCH, |
Johannes Weiner | abe5f97 | 2014-10-02 16:21:10 -0700 | [diff] [blame] | 5783 | high_wmark_pages(zone) - low_wmark_pages(zone) - |
| 5784 | atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH])); |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 5785 | |
Mel Gorman | 56fd56b | 2007-10-16 01:25:58 -0700 | [diff] [blame] | 5786 | setup_zone_migrate_reserve(zone); |
Gerald Schaefer | 1125b4e | 2008-10-18 20:27:11 -0700 | [diff] [blame] | 5787 | spin_unlock_irqrestore(&zone->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5788 | } |
Hideo AOKI | cb45b0e | 2006-04-10 22:52:59 -0700 | [diff] [blame] | 5789 | |
| 5790 | /* update totalreserve_pages */ |
| 5791 | calculate_totalreserve_pages(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5792 | } |
| 5793 | |
Mel Gorman | cfd3da1 | 2011-04-25 21:36:42 +0000 | [diff] [blame] | 5794 | /** |
| 5795 | * setup_per_zone_wmarks - called when min_free_kbytes changes |
| 5796 | * or when memory is hot-{added|removed} |
| 5797 | * |
| 5798 | * Ensures that the watermark[min,low,high] values for each zone are set |
| 5799 | * correctly with respect to min_free_kbytes. |
| 5800 | */ |
| 5801 | void setup_per_zone_wmarks(void) |
| 5802 | { |
| 5803 | mutex_lock(&zonelists_mutex); |
| 5804 | __setup_per_zone_wmarks(); |
| 5805 | mutex_unlock(&zonelists_mutex); |
| 5806 | } |
| 5807 | |
Randy Dunlap | 55a4462 | 2009-09-21 17:01:20 -0700 | [diff] [blame] | 5808 | /* |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 5809 | * The inactive anon list should be small enough that the VM never has to |
| 5810 | * do too much work, but large enough that each inactive page has a chance |
| 5811 | * to be referenced again before it is swapped out. |
| 5812 | * |
| 5813 | * The inactive_anon ratio is the target ratio of ACTIVE_ANON to |
| 5814 | * INACTIVE_ANON pages on this zone's LRU, maintained by the |
| 5815 | * pageout code. A zone->inactive_ratio of 3 means 3:1 or 25% of |
| 5816 | * the anonymous pages are kept on the inactive list. |
| 5817 | * |
| 5818 | * total target max |
| 5819 | * memory ratio inactive anon |
| 5820 | * ------------------------------------- |
| 5821 | * 10MB 1 5MB |
| 5822 | * 100MB 1 50MB |
| 5823 | * 1GB 3 250MB |
| 5824 | * 10GB 10 0.9GB |
| 5825 | * 100GB 31 3GB |
| 5826 | * 1TB 101 10GB |
| 5827 | * 10TB 320 32GB |
| 5828 | */ |
KOSAKI Motohiro | 1b79acc | 2011-05-24 17:11:32 -0700 | [diff] [blame] | 5829 | static void __meminit calculate_zone_inactive_ratio(struct zone *zone) |
Minchan Kim | 96cb4df | 2009-06-16 15:32:49 -0700 | [diff] [blame] | 5830 | { |
| 5831 | unsigned int gb, ratio; |
| 5832 | |
| 5833 | /* Zone size in gigabytes */ |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5834 | gb = zone->managed_pages >> (30 - PAGE_SHIFT); |
Minchan Kim | 96cb4df | 2009-06-16 15:32:49 -0700 | [diff] [blame] | 5835 | if (gb) |
| 5836 | ratio = int_sqrt(10 * gb); |
| 5837 | else |
| 5838 | ratio = 1; |
| 5839 | |
| 5840 | zone->inactive_ratio = ratio; |
| 5841 | } |
| 5842 | |
KOSAKI Motohiro | 839a4fc | 2011-05-24 17:11:31 -0700 | [diff] [blame] | 5843 | static void __meminit setup_per_zone_inactive_ratio(void) |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 5844 | { |
| 5845 | struct zone *zone; |
| 5846 | |
Minchan Kim | 96cb4df | 2009-06-16 15:32:49 -0700 | [diff] [blame] | 5847 | for_each_zone(zone) |
| 5848 | calculate_zone_inactive_ratio(zone); |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 5849 | } |
| 5850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5851 | /* |
| 5852 | * Initialise min_free_kbytes. |
| 5853 | * |
| 5854 | * For small machines we want it small (128k min). For large machines |
| 5855 | * we want it large (64MB max). But it is not linear, because network |
| 5856 | * bandwidth does not increase linearly with machine size. We use |
| 5857 | * |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 5858 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5859 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) |
| 5860 | * |
| 5861 | * which yields |
| 5862 | * |
| 5863 | * 16MB: 512k |
| 5864 | * 32MB: 724k |
| 5865 | * 64MB: 1024k |
| 5866 | * 128MB: 1448k |
| 5867 | * 256MB: 2048k |
| 5868 | * 512MB: 2896k |
| 5869 | * 1024MB: 4096k |
| 5870 | * 2048MB: 5792k |
| 5871 | * 4096MB: 8192k |
| 5872 | * 8192MB: 11584k |
| 5873 | * 16384MB: 16384k |
| 5874 | */ |
KOSAKI Motohiro | 1b79acc | 2011-05-24 17:11:32 -0700 | [diff] [blame] | 5875 | int __meminit init_per_zone_wmark_min(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5876 | { |
| 5877 | unsigned long lowmem_kbytes; |
Michal Hocko | 5f12733 | 2013-07-08 16:00:40 -0700 | [diff] [blame] | 5878 | int new_min_free_kbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5879 | |
| 5880 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); |
Michal Hocko | 5f12733 | 2013-07-08 16:00:40 -0700 | [diff] [blame] | 5881 | new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5882 | |
Michal Hocko | 5f12733 | 2013-07-08 16:00:40 -0700 | [diff] [blame] | 5883 | if (new_min_free_kbytes > user_min_free_kbytes) { |
| 5884 | min_free_kbytes = new_min_free_kbytes; |
| 5885 | if (min_free_kbytes < 128) |
| 5886 | min_free_kbytes = 128; |
| 5887 | if (min_free_kbytes > 65536) |
| 5888 | min_free_kbytes = 65536; |
| 5889 | } else { |
| 5890 | pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n", |
| 5891 | new_min_free_kbytes, user_min_free_kbytes); |
| 5892 | } |
Minchan Kim | bc75d33 | 2009-06-16 15:32:48 -0700 | [diff] [blame] | 5893 | setup_per_zone_wmarks(); |
KOSAKI Motohiro | a6cccdc | 2011-05-24 17:11:33 -0700 | [diff] [blame] | 5894 | refresh_zone_stat_thresholds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5895 | setup_per_zone_lowmem_reserve(); |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 5896 | setup_per_zone_inactive_ratio(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5897 | return 0; |
| 5898 | } |
Minchan Kim | bc75d33 | 2009-06-16 15:32:48 -0700 | [diff] [blame] | 5899 | module_init(init_per_zone_wmark_min) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5900 | |
| 5901 | /* |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 5902 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5903 | * that we can call two helper functions whenever min_free_kbytes |
| 5904 | * changes. |
| 5905 | */ |
Joe Perches | cccad5b | 2014-06-06 14:38:09 -0700 | [diff] [blame] | 5906 | int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5907 | void __user *buffer, size_t *length, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5908 | { |
Han Pingtian | da8c757 | 2014-01-23 15:53:17 -0800 | [diff] [blame] | 5909 | int rc; |
| 5910 | |
| 5911 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
| 5912 | if (rc) |
| 5913 | return rc; |
| 5914 | |
Michal Hocko | 5f12733 | 2013-07-08 16:00:40 -0700 | [diff] [blame] | 5915 | if (write) { |
| 5916 | user_min_free_kbytes = min_free_kbytes; |
Minchan Kim | bc75d33 | 2009-06-16 15:32:48 -0700 | [diff] [blame] | 5917 | setup_per_zone_wmarks(); |
Michal Hocko | 5f12733 | 2013-07-08 16:00:40 -0700 | [diff] [blame] | 5918 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5919 | return 0; |
| 5920 | } |
| 5921 | |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 5922 | #ifdef CONFIG_NUMA |
Joe Perches | cccad5b | 2014-06-06 14:38:09 -0700 | [diff] [blame] | 5923 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5924 | void __user *buffer, size_t *length, loff_t *ppos) |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 5925 | { |
| 5926 | struct zone *zone; |
| 5927 | int rc; |
| 5928 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5929 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 5930 | if (rc) |
| 5931 | return rc; |
| 5932 | |
| 5933 | for_each_zone(zone) |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5934 | zone->min_unmapped_pages = (zone->managed_pages * |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 5935 | sysctl_min_unmapped_ratio) / 100; |
| 5936 | return 0; |
| 5937 | } |
Christoph Lameter | 0ff3849 | 2006-09-25 23:31:52 -0700 | [diff] [blame] | 5938 | |
Joe Perches | cccad5b | 2014-06-06 14:38:09 -0700 | [diff] [blame] | 5939 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5940 | void __user *buffer, size_t *length, loff_t *ppos) |
Christoph Lameter | 0ff3849 | 2006-09-25 23:31:52 -0700 | [diff] [blame] | 5941 | { |
| 5942 | struct zone *zone; |
| 5943 | int rc; |
| 5944 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5945 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
Christoph Lameter | 0ff3849 | 2006-09-25 23:31:52 -0700 | [diff] [blame] | 5946 | if (rc) |
| 5947 | return rc; |
| 5948 | |
| 5949 | for_each_zone(zone) |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 5950 | zone->min_slab_pages = (zone->managed_pages * |
Christoph Lameter | 0ff3849 | 2006-09-25 23:31:52 -0700 | [diff] [blame] | 5951 | sysctl_min_slab_ratio) / 100; |
| 5952 | return 0; |
| 5953 | } |
Christoph Lameter | 9614634 | 2006-07-03 00:24:13 -0700 | [diff] [blame] | 5954 | #endif |
| 5955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5956 | /* |
| 5957 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around |
| 5958 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() |
| 5959 | * whenever sysctl_lowmem_reserve_ratio changes. |
| 5960 | * |
| 5961 | * The reserve ratio obviously has absolutely no relation with the |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 5962 | * minimum watermarks. The lowmem reserve ratio can only make sense |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5963 | * if in function of the boot time zone sizes. |
| 5964 | */ |
Joe Perches | cccad5b | 2014-06-06 14:38:09 -0700 | [diff] [blame] | 5965 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5966 | void __user *buffer, size_t *length, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5967 | { |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5968 | proc_dointvec_minmax(table, write, buffer, length, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5969 | setup_per_zone_lowmem_reserve(); |
| 5970 | return 0; |
| 5971 | } |
| 5972 | |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 5973 | /* |
| 5974 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 5975 | * cpu. It is the fraction of total pages in each zone that a hot per cpu |
| 5976 | * pagelist can have before it gets flushed back to buddy allocator. |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 5977 | */ |
Joe Perches | cccad5b | 2014-06-06 14:38:09 -0700 | [diff] [blame] | 5978 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 5979 | void __user *buffer, size_t *length, loff_t *ppos) |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 5980 | { |
| 5981 | struct zone *zone; |
David Rientjes | 7cd2b0a | 2014-06-23 13:22:04 -0700 | [diff] [blame] | 5982 | int old_percpu_pagelist_fraction; |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 5983 | int ret; |
| 5984 | |
Cody P Schafer | c8e251f | 2013-07-03 15:01:29 -0700 | [diff] [blame] | 5985 | mutex_lock(&pcp_batch_high_lock); |
David Rientjes | 7cd2b0a | 2014-06-23 13:22:04 -0700 | [diff] [blame] | 5986 | old_percpu_pagelist_fraction = percpu_pagelist_fraction; |
| 5987 | |
| 5988 | ret = proc_dointvec_minmax(table, write, buffer, length, ppos); |
| 5989 | if (!write || ret < 0) |
| 5990 | goto out; |
| 5991 | |
| 5992 | /* Sanity checking to avoid pcp imbalance */ |
| 5993 | if (percpu_pagelist_fraction && |
| 5994 | percpu_pagelist_fraction < MIN_PERCPU_PAGELIST_FRACTION) { |
| 5995 | percpu_pagelist_fraction = old_percpu_pagelist_fraction; |
| 5996 | ret = -EINVAL; |
| 5997 | goto out; |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 5998 | } |
David Rientjes | 7cd2b0a | 2014-06-23 13:22:04 -0700 | [diff] [blame] | 5999 | |
| 6000 | /* No change? */ |
| 6001 | if (percpu_pagelist_fraction == old_percpu_pagelist_fraction) |
| 6002 | goto out; |
| 6003 | |
| 6004 | for_each_populated_zone(zone) { |
| 6005 | unsigned int cpu; |
| 6006 | |
| 6007 | for_each_possible_cpu(cpu) |
| 6008 | pageset_set_high_and_batch(zone, |
| 6009 | per_cpu_ptr(zone->pageset, cpu)); |
| 6010 | } |
| 6011 | out: |
Cody P Schafer | c8e251f | 2013-07-03 15:01:29 -0700 | [diff] [blame] | 6012 | mutex_unlock(&pcp_batch_high_lock); |
David Rientjes | 7cd2b0a | 2014-06-23 13:22:04 -0700 | [diff] [blame] | 6013 | return ret; |
Rohit Seth | 8ad4b1f | 2006-01-08 01:00:40 -0800 | [diff] [blame] | 6014 | } |
| 6015 | |
David S. Miller | f034b5d | 2006-08-24 03:08:07 -0700 | [diff] [blame] | 6016 | int hashdist = HASHDIST_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6017 | |
| 6018 | #ifdef CONFIG_NUMA |
| 6019 | static int __init set_hashdist(char *str) |
| 6020 | { |
| 6021 | if (!str) |
| 6022 | return 0; |
| 6023 | hashdist = simple_strtoul(str, &str, 0); |
| 6024 | return 1; |
| 6025 | } |
| 6026 | __setup("hashdist=", set_hashdist); |
| 6027 | #endif |
| 6028 | |
| 6029 | /* |
| 6030 | * allocate a large system hash table from bootmem |
| 6031 | * - it is assumed that the hash table must contain an exact power-of-2 |
| 6032 | * quantity of entries |
| 6033 | * - limit is the number of hash buckets, not the total allocation size |
| 6034 | */ |
| 6035 | void *__init alloc_large_system_hash(const char *tablename, |
| 6036 | unsigned long bucketsize, |
| 6037 | unsigned long numentries, |
| 6038 | int scale, |
| 6039 | int flags, |
| 6040 | unsigned int *_hash_shift, |
| 6041 | unsigned int *_hash_mask, |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 6042 | unsigned long low_limit, |
| 6043 | unsigned long high_limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6044 | { |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 6045 | unsigned long long max = high_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6046 | unsigned long log2qty, size; |
| 6047 | void *table = NULL; |
| 6048 | |
| 6049 | /* allow the kernel cmdline to have a say */ |
| 6050 | if (!numentries) { |
| 6051 | /* round applicable memory size up to nearest megabyte */ |
Andrew Morton | 0490366 | 2006-12-06 20:37:33 -0800 | [diff] [blame] | 6052 | numentries = nr_kernel_pages; |
Jerry Zhou | a7e8331 | 2013-09-11 14:20:26 -0700 | [diff] [blame] | 6053 | |
| 6054 | /* It isn't necessary when PAGE_SIZE >= 1MB */ |
| 6055 | if (PAGE_SHIFT < 20) |
| 6056 | numentries = round_up(numentries, (1<<20)/PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6057 | |
| 6058 | /* limit to 1 bucket per 2^scale bytes of low memory */ |
| 6059 | if (scale > PAGE_SHIFT) |
| 6060 | numentries >>= (scale - PAGE_SHIFT); |
| 6061 | else |
| 6062 | numentries <<= (PAGE_SHIFT - scale); |
Paul Mundt | 9ab37b8 | 2007-01-05 16:36:30 -0800 | [diff] [blame] | 6063 | |
| 6064 | /* Make sure we've got at least a 0-order allocation.. */ |
Jan Beulich | 2c85f51 | 2009-09-21 17:03:07 -0700 | [diff] [blame] | 6065 | if (unlikely(flags & HASH_SMALL)) { |
| 6066 | /* Makes no sense without HASH_EARLY */ |
| 6067 | WARN_ON(!(flags & HASH_EARLY)); |
| 6068 | if (!(numentries >> *_hash_shift)) { |
| 6069 | numentries = 1UL << *_hash_shift; |
| 6070 | BUG_ON(!numentries); |
| 6071 | } |
| 6072 | } else if (unlikely((numentries * bucketsize) < PAGE_SIZE)) |
Paul Mundt | 9ab37b8 | 2007-01-05 16:36:30 -0800 | [diff] [blame] | 6073 | numentries = PAGE_SIZE / bucketsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6074 | } |
John Hawkes | 6e692ed | 2006-03-25 03:08:02 -0800 | [diff] [blame] | 6075 | numentries = roundup_pow_of_two(numentries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6076 | |
| 6077 | /* limit allocation size to 1/16 total memory by default */ |
| 6078 | if (max == 0) { |
| 6079 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; |
| 6080 | do_div(max, bucketsize); |
| 6081 | } |
Dimitri Sivanich | 074b851 | 2012-02-08 12:39:07 -0800 | [diff] [blame] | 6082 | max = min(max, 0x80000000ULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6083 | |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 6084 | if (numentries < low_limit) |
| 6085 | numentries = low_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6086 | if (numentries > max) |
| 6087 | numentries = max; |
| 6088 | |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 6089 | log2qty = ilog2(numentries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6090 | |
| 6091 | do { |
| 6092 | size = bucketsize << log2qty; |
| 6093 | if (flags & HASH_EARLY) |
Santosh Shilimkar | 6782832 | 2014-01-21 15:50:25 -0800 | [diff] [blame] | 6094 | table = memblock_virt_alloc_nopanic(size, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6095 | else if (hashdist) |
| 6096 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); |
| 6097 | else { |
Eric Dumazet | 1037b83 | 2007-07-15 23:38:05 -0700 | [diff] [blame] | 6098 | /* |
| 6099 | * If bucketsize is not a power-of-two, we may free |
Mel Gorman | a1dd268 | 2009-06-16 15:32:19 -0700 | [diff] [blame] | 6100 | * some pages at the end of hash table which |
| 6101 | * alloc_pages_exact() automatically does |
Eric Dumazet | 1037b83 | 2007-07-15 23:38:05 -0700 | [diff] [blame] | 6102 | */ |
Catalin Marinas | 264ef8a | 2009-07-07 10:33:01 +0100 | [diff] [blame] | 6103 | if (get_order(size) < MAX_ORDER) { |
Mel Gorman | a1dd268 | 2009-06-16 15:32:19 -0700 | [diff] [blame] | 6104 | table = alloc_pages_exact(size, GFP_ATOMIC); |
Catalin Marinas | 264ef8a | 2009-07-07 10:33:01 +0100 | [diff] [blame] | 6105 | kmemleak_alloc(table, size, 1, GFP_ATOMIC); |
| 6106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6107 | } |
| 6108 | } while (!table && size > PAGE_SIZE && --log2qty); |
| 6109 | |
| 6110 | if (!table) |
| 6111 | panic("Failed to allocate %s hash table\n", tablename); |
| 6112 | |
Robin Holt | f241e660 | 2010-10-07 12:59:26 -0700 | [diff] [blame] | 6113 | printk(KERN_INFO "%s hash table entries: %ld (order: %d, %lu bytes)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6114 | tablename, |
Robin Holt | f241e660 | 2010-10-07 12:59:26 -0700 | [diff] [blame] | 6115 | (1UL << log2qty), |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 6116 | ilog2(size) - PAGE_SHIFT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6117 | size); |
| 6118 | |
| 6119 | if (_hash_shift) |
| 6120 | *_hash_shift = log2qty; |
| 6121 | if (_hash_mask) |
| 6122 | *_hash_mask = (1 << log2qty) - 1; |
| 6123 | |
| 6124 | return table; |
| 6125 | } |
KAMEZAWA Hiroyuki | a117e66 | 2006-03-27 01:15:25 -0800 | [diff] [blame] | 6126 | |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6127 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
| 6128 | static inline unsigned long *get_pageblock_bitmap(struct zone *zone, |
| 6129 | unsigned long pfn) |
| 6130 | { |
| 6131 | #ifdef CONFIG_SPARSEMEM |
| 6132 | return __pfn_to_section(pfn)->pageblock_flags; |
| 6133 | #else |
| 6134 | return zone->pageblock_flags; |
| 6135 | #endif /* CONFIG_SPARSEMEM */ |
| 6136 | } |
Andrew Morton | 6220ec7 | 2006-10-19 23:29:05 -0700 | [diff] [blame] | 6137 | |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6138 | static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn) |
| 6139 | { |
| 6140 | #ifdef CONFIG_SPARSEMEM |
| 6141 | pfn &= (PAGES_PER_SECTION-1); |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 6142 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6143 | #else |
Laura Abbott | c060f94 | 2013-01-11 14:31:51 -0800 | [diff] [blame] | 6144 | pfn = pfn - round_down(zone->zone_start_pfn, pageblock_nr_pages); |
Mel Gorman | d9c2340 | 2007-10-16 01:26:01 -0700 | [diff] [blame] | 6145 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6146 | #endif /* CONFIG_SPARSEMEM */ |
| 6147 | } |
| 6148 | |
| 6149 | /** |
Randy Dunlap | 1aab4d7 | 2014-07-27 14:15:33 -0700 | [diff] [blame] | 6150 | * get_pfnblock_flags_mask - Return the requested group of flags for the pageblock_nr_pages block of pages |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6151 | * @page: The page within the block of interest |
Randy Dunlap | 1aab4d7 | 2014-07-27 14:15:33 -0700 | [diff] [blame] | 6152 | * @pfn: The target page frame number |
| 6153 | * @end_bitidx: The last bit of interest to retrieve |
| 6154 | * @mask: mask of bits that the caller is interested in |
| 6155 | * |
| 6156 | * Return: pageblock_bits flags |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6157 | */ |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 6158 | unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn, |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6159 | unsigned long end_bitidx, |
| 6160 | unsigned long mask) |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6161 | { |
| 6162 | struct zone *zone; |
| 6163 | unsigned long *bitmap; |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 6164 | unsigned long bitidx, word_bitidx; |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6165 | unsigned long word; |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6166 | |
| 6167 | zone = page_zone(page); |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6168 | bitmap = get_pageblock_bitmap(zone, pfn); |
| 6169 | bitidx = pfn_to_bitidx(zone, pfn); |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6170 | word_bitidx = bitidx / BITS_PER_LONG; |
| 6171 | bitidx &= (BITS_PER_LONG-1); |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6172 | |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6173 | word = bitmap[word_bitidx]; |
| 6174 | bitidx += end_bitidx; |
| 6175 | return (word >> (BITS_PER_LONG - bitidx - 1)) & mask; |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6176 | } |
| 6177 | |
| 6178 | /** |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 6179 | * set_pfnblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6180 | * @page: The page within the block of interest |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6181 | * @flags: The flags to set |
Randy Dunlap | 1aab4d7 | 2014-07-27 14:15:33 -0700 | [diff] [blame] | 6182 | * @pfn: The target page frame number |
| 6183 | * @end_bitidx: The last bit of interest |
| 6184 | * @mask: mask of bits that the caller is interested in |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6185 | */ |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 6186 | void set_pfnblock_flags_mask(struct page *page, unsigned long flags, |
| 6187 | unsigned long pfn, |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6188 | unsigned long end_bitidx, |
| 6189 | unsigned long mask) |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6190 | { |
| 6191 | struct zone *zone; |
| 6192 | unsigned long *bitmap; |
Mel Gorman | dc4b0ca | 2014-06-04 16:10:17 -0700 | [diff] [blame] | 6193 | unsigned long bitidx, word_bitidx; |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6194 | unsigned long old_word, word; |
| 6195 | |
| 6196 | BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6197 | |
| 6198 | zone = page_zone(page); |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6199 | bitmap = get_pageblock_bitmap(zone, pfn); |
| 6200 | bitidx = pfn_to_bitidx(zone, pfn); |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6201 | word_bitidx = bitidx / BITS_PER_LONG; |
| 6202 | bitidx &= (BITS_PER_LONG-1); |
| 6203 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 6204 | VM_BUG_ON_PAGE(!zone_spans_pfn(zone, pfn), page); |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6205 | |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6206 | bitidx += end_bitidx; |
| 6207 | mask <<= (BITS_PER_LONG - bitidx - 1); |
| 6208 | flags <<= (BITS_PER_LONG - bitidx - 1); |
| 6209 | |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 6210 | word = READ_ONCE(bitmap[word_bitidx]); |
Mel Gorman | e58469b | 2014-06-04 16:10:16 -0700 | [diff] [blame] | 6211 | for (;;) { |
| 6212 | old_word = cmpxchg(&bitmap[word_bitidx], word, (word & ~mask) | flags); |
| 6213 | if (word == old_word) |
| 6214 | break; |
| 6215 | word = old_word; |
| 6216 | } |
Mel Gorman | 835c134 | 2007-10-16 01:25:47 -0700 | [diff] [blame] | 6217 | } |
KAMEZAWA Hiroyuki | a5d76b5 | 2007-10-16 01:26:11 -0700 | [diff] [blame] | 6218 | |
| 6219 | /* |
Minchan Kim | 8093451 | 2012-07-31 16:43:01 -0700 | [diff] [blame] | 6220 | * This function checks whether pageblock includes unmovable pages or not. |
| 6221 | * If @count is not zero, it is okay to include less @count unmovable pages |
| 6222 | * |
Pintu Kumar | b8af294 | 2013-09-11 14:20:34 -0700 | [diff] [blame] | 6223 | * PageLRU check without isolation or lru_lock could race so that |
Minchan Kim | 8093451 | 2012-07-31 16:43:01 -0700 | [diff] [blame] | 6224 | * MIGRATE_MOVABLE block might include unmovable pages. It means you can't |
| 6225 | * expect this function should be exact. |
KAMEZAWA Hiroyuki | a5d76b5 | 2007-10-16 01:26:11 -0700 | [diff] [blame] | 6226 | */ |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 6227 | bool has_unmovable_pages(struct zone *zone, struct page *page, int count, |
| 6228 | bool skip_hwpoisoned_pages) |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6229 | { |
| 6230 | unsigned long pfn, iter, found; |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6231 | int mt; |
| 6232 | |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6233 | /* |
| 6234 | * For avoiding noise data, lru_add_drain_all() should be called |
Minchan Kim | 8093451 | 2012-07-31 16:43:01 -0700 | [diff] [blame] | 6235 | * If ZONE_MOVABLE, the zone never contains unmovable pages |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6236 | */ |
| 6237 | if (zone_idx(zone) == ZONE_MOVABLE) |
Minchan Kim | 8093451 | 2012-07-31 16:43:01 -0700 | [diff] [blame] | 6238 | return false; |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6239 | mt = get_pageblock_migratetype(page); |
| 6240 | if (mt == MIGRATE_MOVABLE || is_migrate_cma(mt)) |
Minchan Kim | 8093451 | 2012-07-31 16:43:01 -0700 | [diff] [blame] | 6241 | return false; |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6242 | |
| 6243 | pfn = page_to_pfn(page); |
| 6244 | for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) { |
| 6245 | unsigned long check = pfn + iter; |
| 6246 | |
Namhyung Kim | 29723fc | 2011-02-25 14:44:25 -0800 | [diff] [blame] | 6247 | if (!pfn_valid_within(check)) |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6248 | continue; |
Namhyung Kim | 29723fc | 2011-02-25 14:44:25 -0800 | [diff] [blame] | 6249 | |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6250 | page = pfn_to_page(check); |
Naoya Horiguchi | c8721bb | 2013-09-11 14:22:09 -0700 | [diff] [blame] | 6251 | |
| 6252 | /* |
| 6253 | * Hugepages are not in LRU lists, but they're movable. |
| 6254 | * We need not scan over tail pages bacause we don't |
| 6255 | * handle each tail page individually in migration. |
| 6256 | */ |
| 6257 | if (PageHuge(page)) { |
| 6258 | iter = round_up(iter + 1, 1<<compound_order(page)) - 1; |
| 6259 | continue; |
| 6260 | } |
| 6261 | |
Minchan Kim | 97d255c | 2012-07-31 16:42:59 -0700 | [diff] [blame] | 6262 | /* |
| 6263 | * We can't use page_count without pin a page |
| 6264 | * because another CPU can free compound page. |
| 6265 | * This check already skips compound tails of THP |
| 6266 | * because their page->_count is zero at all time. |
| 6267 | */ |
| 6268 | if (!atomic_read(&page->_count)) { |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6269 | if (PageBuddy(page)) |
| 6270 | iter += (1 << page_order(page)) - 1; |
| 6271 | continue; |
| 6272 | } |
Minchan Kim | 97d255c | 2012-07-31 16:42:59 -0700 | [diff] [blame] | 6273 | |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 6274 | /* |
| 6275 | * The HWPoisoned page may be not in buddy system, and |
| 6276 | * page_count() is not 0. |
| 6277 | */ |
| 6278 | if (skip_hwpoisoned_pages && PageHWPoison(page)) |
| 6279 | continue; |
| 6280 | |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6281 | if (!PageLRU(page)) |
| 6282 | found++; |
| 6283 | /* |
Johannes Weiner | 6b4f779 | 2014-12-12 16:56:13 -0800 | [diff] [blame] | 6284 | * If there are RECLAIMABLE pages, we need to check |
| 6285 | * it. But now, memory offline itself doesn't call |
| 6286 | * shrink_node_slabs() and it still to be fixed. |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6287 | */ |
| 6288 | /* |
| 6289 | * If the page is not RAM, page_count()should be 0. |
| 6290 | * we don't need more check. This is an _used_ not-movable page. |
| 6291 | * |
| 6292 | * The problematic thing here is PG_reserved pages. PG_reserved |
| 6293 | * is set to both of a memory hole page and a _used_ kernel |
| 6294 | * page at boot. |
| 6295 | */ |
| 6296 | if (found > count) |
Minchan Kim | 8093451 | 2012-07-31 16:43:01 -0700 | [diff] [blame] | 6297 | return true; |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6298 | } |
Minchan Kim | 8093451 | 2012-07-31 16:43:01 -0700 | [diff] [blame] | 6299 | return false; |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 6300 | } |
| 6301 | |
| 6302 | bool is_pageblock_removable_nolock(struct page *page) |
| 6303 | { |
Michal Hocko | 656a070 | 2012-01-20 14:33:58 -0800 | [diff] [blame] | 6304 | struct zone *zone; |
| 6305 | unsigned long pfn; |
Michal Hocko | 687875f | 2012-01-20 14:33:55 -0800 | [diff] [blame] | 6306 | |
| 6307 | /* |
| 6308 | * We have to be careful here because we are iterating over memory |
| 6309 | * sections which are not zone aware so we might end up outside of |
| 6310 | * the zone but still within the section. |
Michal Hocko | 656a070 | 2012-01-20 14:33:58 -0800 | [diff] [blame] | 6311 | * We have to take care about the node as well. If the node is offline |
| 6312 | * its NODE_DATA will be NULL - see page_zone. |
Michal Hocko | 687875f | 2012-01-20 14:33:55 -0800 | [diff] [blame] | 6313 | */ |
Michal Hocko | 656a070 | 2012-01-20 14:33:58 -0800 | [diff] [blame] | 6314 | if (!node_online(page_to_nid(page))) |
| 6315 | return false; |
| 6316 | |
| 6317 | zone = page_zone(page); |
| 6318 | pfn = page_to_pfn(page); |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 6319 | if (!zone_spans_pfn(zone, pfn)) |
Michal Hocko | 687875f | 2012-01-20 14:33:55 -0800 | [diff] [blame] | 6320 | return false; |
| 6321 | |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 6322 | return !has_unmovable_pages(zone, page, 0, true); |
KAMEZAWA Hiroyuki | a5d76b5 | 2007-10-16 01:26:11 -0700 | [diff] [blame] | 6323 | } |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 6324 | |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6325 | #ifdef CONFIG_CMA |
| 6326 | |
| 6327 | static unsigned long pfn_max_align_down(unsigned long pfn) |
| 6328 | { |
| 6329 | return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES, |
| 6330 | pageblock_nr_pages) - 1); |
| 6331 | } |
| 6332 | |
| 6333 | static unsigned long pfn_max_align_up(unsigned long pfn) |
| 6334 | { |
| 6335 | return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES, |
| 6336 | pageblock_nr_pages)); |
| 6337 | } |
| 6338 | |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6339 | /* [start, end) must belong to a single zone. */ |
Mel Gorman | bb13ffe | 2012-10-08 16:32:41 -0700 | [diff] [blame] | 6340 | static int __alloc_contig_migrate_range(struct compact_control *cc, |
| 6341 | unsigned long start, unsigned long end) |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6342 | { |
| 6343 | /* This function is based on compact_zone() from compaction.c. */ |
Minchan Kim | beb51ea | 2012-10-08 16:33:51 -0700 | [diff] [blame] | 6344 | unsigned long nr_reclaimed; |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6345 | unsigned long pfn = start; |
| 6346 | unsigned int tries = 0; |
| 6347 | int ret = 0; |
| 6348 | |
Marek Szyprowski | be49a6e | 2012-12-12 13:51:19 -0800 | [diff] [blame] | 6349 | migrate_prep(); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6350 | |
Mel Gorman | bb13ffe | 2012-10-08 16:32:41 -0700 | [diff] [blame] | 6351 | while (pfn < end || !list_empty(&cc->migratepages)) { |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6352 | if (fatal_signal_pending(current)) { |
| 6353 | ret = -EINTR; |
| 6354 | break; |
| 6355 | } |
| 6356 | |
Mel Gorman | bb13ffe | 2012-10-08 16:32:41 -0700 | [diff] [blame] | 6357 | if (list_empty(&cc->migratepages)) { |
| 6358 | cc->nr_migratepages = 0; |
Vlastimil Babka | edc2ca6 | 2014-10-09 15:27:09 -0700 | [diff] [blame] | 6359 | pfn = isolate_migratepages_range(cc, pfn, end); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6360 | if (!pfn) { |
| 6361 | ret = -EINTR; |
| 6362 | break; |
| 6363 | } |
| 6364 | tries = 0; |
| 6365 | } else if (++tries == 5) { |
| 6366 | ret = ret < 0 ? ret : -EBUSY; |
| 6367 | break; |
| 6368 | } |
| 6369 | |
Minchan Kim | beb51ea | 2012-10-08 16:33:51 -0700 | [diff] [blame] | 6370 | nr_reclaimed = reclaim_clean_pages_from_list(cc->zone, |
| 6371 | &cc->migratepages); |
| 6372 | cc->nr_migratepages -= nr_reclaimed; |
Minchan Kim | 02c6de8 | 2012-10-08 16:31:55 -0700 | [diff] [blame] | 6373 | |
Hugh Dickins | 9c620e2 | 2013-02-22 16:35:14 -0800 | [diff] [blame] | 6374 | ret = migrate_pages(&cc->migratepages, alloc_migrate_target, |
David Rientjes | e0b9dae | 2014-06-04 16:08:28 -0700 | [diff] [blame] | 6375 | NULL, 0, cc->mode, MR_CMA); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6376 | } |
Srinivas Pandruvada | 2a6f512 | 2013-02-22 16:32:09 -0800 | [diff] [blame] | 6377 | if (ret < 0) { |
| 6378 | putback_movable_pages(&cc->migratepages); |
| 6379 | return ret; |
| 6380 | } |
| 6381 | return 0; |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6382 | } |
| 6383 | |
| 6384 | /** |
| 6385 | * alloc_contig_range() -- tries to allocate given range of pages |
| 6386 | * @start: start PFN to allocate |
| 6387 | * @end: one-past-the-last PFN to allocate |
Michal Nazarewicz | 0815f3d | 2012-04-03 15:06:15 +0200 | [diff] [blame] | 6388 | * @migratetype: migratetype of the underlaying pageblocks (either |
| 6389 | * #MIGRATE_MOVABLE or #MIGRATE_CMA). All pageblocks |
| 6390 | * in range must have the same migratetype and it must |
| 6391 | * be either of the two. |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6392 | * |
| 6393 | * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES |
| 6394 | * aligned, however it's the caller's responsibility to guarantee that |
| 6395 | * we are the only thread that changes migrate type of pageblocks the |
| 6396 | * pages fall in. |
| 6397 | * |
| 6398 | * The PFN range must belong to a single zone. |
| 6399 | * |
| 6400 | * Returns zero on success or negative error code. On success all |
| 6401 | * pages which PFN is in [start, end) are allocated for the caller and |
| 6402 | * need to be freed with free_contig_range(). |
| 6403 | */ |
Michal Nazarewicz | 0815f3d | 2012-04-03 15:06:15 +0200 | [diff] [blame] | 6404 | int alloc_contig_range(unsigned long start, unsigned long end, |
| 6405 | unsigned migratetype) |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6406 | { |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6407 | unsigned long outer_start, outer_end; |
| 6408 | int ret = 0, order; |
| 6409 | |
Mel Gorman | bb13ffe | 2012-10-08 16:32:41 -0700 | [diff] [blame] | 6410 | struct compact_control cc = { |
| 6411 | .nr_migratepages = 0, |
| 6412 | .order = -1, |
| 6413 | .zone = page_zone(pfn_to_page(start)), |
David Rientjes | e0b9dae | 2014-06-04 16:08:28 -0700 | [diff] [blame] | 6414 | .mode = MIGRATE_SYNC, |
Mel Gorman | bb13ffe | 2012-10-08 16:32:41 -0700 | [diff] [blame] | 6415 | .ignore_skip_hint = true, |
| 6416 | }; |
| 6417 | INIT_LIST_HEAD(&cc.migratepages); |
| 6418 | |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6419 | /* |
| 6420 | * What we do here is we mark all pageblocks in range as |
| 6421 | * MIGRATE_ISOLATE. Because pageblock and max order pages may |
| 6422 | * have different sizes, and due to the way page allocator |
| 6423 | * work, we align the range to biggest of the two pages so |
| 6424 | * that page allocator won't try to merge buddies from |
| 6425 | * different pageblocks and change MIGRATE_ISOLATE to some |
| 6426 | * other migration type. |
| 6427 | * |
| 6428 | * Once the pageblocks are marked as MIGRATE_ISOLATE, we |
| 6429 | * migrate the pages from an unaligned range (ie. pages that |
| 6430 | * we are interested in). This will put all the pages in |
| 6431 | * range back to page allocator as MIGRATE_ISOLATE. |
| 6432 | * |
| 6433 | * When this is done, we take the pages in range from page |
| 6434 | * allocator removing them from the buddy system. This way |
| 6435 | * page allocator will never consider using them. |
| 6436 | * |
| 6437 | * This lets us mark the pageblocks back as |
| 6438 | * MIGRATE_CMA/MIGRATE_MOVABLE so that free pages in the |
| 6439 | * aligned range but not in the unaligned, original range are |
| 6440 | * put back to page allocator so that buddy can use them. |
| 6441 | */ |
| 6442 | |
| 6443 | ret = start_isolate_page_range(pfn_max_align_down(start), |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 6444 | pfn_max_align_up(end), migratetype, |
| 6445 | false); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6446 | if (ret) |
Bob Liu | 86a595f | 2012-10-25 13:37:56 -0700 | [diff] [blame] | 6447 | return ret; |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6448 | |
Mel Gorman | bb13ffe | 2012-10-08 16:32:41 -0700 | [diff] [blame] | 6449 | ret = __alloc_contig_migrate_range(&cc, start, end); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6450 | if (ret) |
| 6451 | goto done; |
| 6452 | |
| 6453 | /* |
| 6454 | * Pages from [start, end) are within a MAX_ORDER_NR_PAGES |
| 6455 | * aligned blocks that are marked as MIGRATE_ISOLATE. What's |
| 6456 | * more, all pages in [start, end) are free in page allocator. |
| 6457 | * What we are going to do is to allocate all pages from |
| 6458 | * [start, end) (that is remove them from page allocator). |
| 6459 | * |
| 6460 | * The only problem is that pages at the beginning and at the |
| 6461 | * end of interesting range may be not aligned with pages that |
| 6462 | * page allocator holds, ie. they can be part of higher order |
| 6463 | * pages. Because of this, we reserve the bigger range and |
| 6464 | * once this is done free the pages we are not interested in. |
| 6465 | * |
| 6466 | * We don't have to hold zone->lock here because the pages are |
| 6467 | * isolated thus they won't get removed from buddy. |
| 6468 | */ |
| 6469 | |
| 6470 | lru_add_drain_all(); |
Vlastimil Babka | 510f550 | 2014-12-10 15:43:07 -0800 | [diff] [blame] | 6471 | drain_all_pages(cc.zone); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6472 | |
| 6473 | order = 0; |
| 6474 | outer_start = start; |
| 6475 | while (!PageBuddy(pfn_to_page(outer_start))) { |
| 6476 | if (++order >= MAX_ORDER) { |
| 6477 | ret = -EBUSY; |
| 6478 | goto done; |
| 6479 | } |
| 6480 | outer_start &= ~0UL << order; |
| 6481 | } |
| 6482 | |
| 6483 | /* Make sure the range is really isolated. */ |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 6484 | if (test_pages_isolated(outer_start, end, false)) { |
Michal Nazarewicz | dae803e | 2014-11-13 15:19:27 -0800 | [diff] [blame] | 6485 | pr_info("%s: [%lx, %lx) PFNs busy\n", |
| 6486 | __func__, outer_start, end); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6487 | ret = -EBUSY; |
| 6488 | goto done; |
| 6489 | } |
| 6490 | |
Marek Szyprowski | 49f223a | 2012-01-25 12:49:24 +0100 | [diff] [blame] | 6491 | /* Grab isolated pages from freelists. */ |
Mel Gorman | bb13ffe | 2012-10-08 16:32:41 -0700 | [diff] [blame] | 6492 | outer_end = isolate_freepages_range(&cc, outer_start, end); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6493 | if (!outer_end) { |
| 6494 | ret = -EBUSY; |
| 6495 | goto done; |
| 6496 | } |
| 6497 | |
| 6498 | /* Free head and tail (if any) */ |
| 6499 | if (start != outer_start) |
| 6500 | free_contig_range(outer_start, start - outer_start); |
| 6501 | if (end != outer_end) |
| 6502 | free_contig_range(end, outer_end - end); |
| 6503 | |
| 6504 | done: |
| 6505 | undo_isolate_page_range(pfn_max_align_down(start), |
Michal Nazarewicz | 0815f3d | 2012-04-03 15:06:15 +0200 | [diff] [blame] | 6506 | pfn_max_align_up(end), migratetype); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6507 | return ret; |
| 6508 | } |
| 6509 | |
| 6510 | void free_contig_range(unsigned long pfn, unsigned nr_pages) |
| 6511 | { |
Marek Szyprowski | bcc2b02 | 2012-12-20 15:05:18 -0800 | [diff] [blame] | 6512 | unsigned int count = 0; |
| 6513 | |
| 6514 | for (; nr_pages--; pfn++) { |
| 6515 | struct page *page = pfn_to_page(pfn); |
| 6516 | |
| 6517 | count += page_count(page) != 1; |
| 6518 | __free_page(page); |
| 6519 | } |
| 6520 | WARN(count != 0, "%d pages are still in use!\n", count); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 6521 | } |
| 6522 | #endif |
| 6523 | |
Jiang Liu | 4ed7e02 | 2012-07-31 16:43:35 -0700 | [diff] [blame] | 6524 | #ifdef CONFIG_MEMORY_HOTPLUG |
Cody P Schafer | 0a647f3 | 2013-07-03 15:01:33 -0700 | [diff] [blame] | 6525 | /* |
| 6526 | * The zone indicated has a new number of managed_pages; batch sizes and percpu |
| 6527 | * page high values need to be recalulated. |
| 6528 | */ |
Jiang Liu | 4ed7e02 | 2012-07-31 16:43:35 -0700 | [diff] [blame] | 6529 | void __meminit zone_pcp_update(struct zone *zone) |
| 6530 | { |
Cody P Schafer | 0a647f3 | 2013-07-03 15:01:33 -0700 | [diff] [blame] | 6531 | unsigned cpu; |
Cody P Schafer | c8e251f | 2013-07-03 15:01:29 -0700 | [diff] [blame] | 6532 | mutex_lock(&pcp_batch_high_lock); |
Cody P Schafer | 0a647f3 | 2013-07-03 15:01:33 -0700 | [diff] [blame] | 6533 | for_each_possible_cpu(cpu) |
Cody P Schafer | 169f6c1 | 2013-07-03 15:01:41 -0700 | [diff] [blame] | 6534 | pageset_set_high_and_batch(zone, |
| 6535 | per_cpu_ptr(zone->pageset, cpu)); |
Cody P Schafer | c8e251f | 2013-07-03 15:01:29 -0700 | [diff] [blame] | 6536 | mutex_unlock(&pcp_batch_high_lock); |
Jiang Liu | 4ed7e02 | 2012-07-31 16:43:35 -0700 | [diff] [blame] | 6537 | } |
| 6538 | #endif |
| 6539 | |
Jiang Liu | 340175b | 2012-07-31 16:43:32 -0700 | [diff] [blame] | 6540 | void zone_pcp_reset(struct zone *zone) |
| 6541 | { |
| 6542 | unsigned long flags; |
Minchan Kim | 5a88381 | 2012-10-08 16:33:39 -0700 | [diff] [blame] | 6543 | int cpu; |
| 6544 | struct per_cpu_pageset *pset; |
Jiang Liu | 340175b | 2012-07-31 16:43:32 -0700 | [diff] [blame] | 6545 | |
| 6546 | /* avoid races with drain_pages() */ |
| 6547 | local_irq_save(flags); |
| 6548 | if (zone->pageset != &boot_pageset) { |
Minchan Kim | 5a88381 | 2012-10-08 16:33:39 -0700 | [diff] [blame] | 6549 | for_each_online_cpu(cpu) { |
| 6550 | pset = per_cpu_ptr(zone->pageset, cpu); |
| 6551 | drain_zonestat(zone, pset); |
| 6552 | } |
Jiang Liu | 340175b | 2012-07-31 16:43:32 -0700 | [diff] [blame] | 6553 | free_percpu(zone->pageset); |
| 6554 | zone->pageset = &boot_pageset; |
| 6555 | } |
| 6556 | local_irq_restore(flags); |
| 6557 | } |
| 6558 | |
Wen Congyang | 6dcd73d | 2012-12-11 16:01:01 -0800 | [diff] [blame] | 6559 | #ifdef CONFIG_MEMORY_HOTREMOVE |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 6560 | /* |
| 6561 | * All pages in the range must be isolated before calling this. |
| 6562 | */ |
| 6563 | void |
| 6564 | __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) |
| 6565 | { |
| 6566 | struct page *page; |
| 6567 | struct zone *zone; |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 6568 | unsigned int order, i; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 6569 | unsigned long pfn; |
| 6570 | unsigned long flags; |
| 6571 | /* find the first valid pfn */ |
| 6572 | for (pfn = start_pfn; pfn < end_pfn; pfn++) |
| 6573 | if (pfn_valid(pfn)) |
| 6574 | break; |
| 6575 | if (pfn == end_pfn) |
| 6576 | return; |
| 6577 | zone = page_zone(pfn_to_page(pfn)); |
| 6578 | spin_lock_irqsave(&zone->lock, flags); |
| 6579 | pfn = start_pfn; |
| 6580 | while (pfn < end_pfn) { |
| 6581 | if (!pfn_valid(pfn)) { |
| 6582 | pfn++; |
| 6583 | continue; |
| 6584 | } |
| 6585 | page = pfn_to_page(pfn); |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 6586 | /* |
| 6587 | * The HWPoisoned page may be not in buddy system, and |
| 6588 | * page_count() is not 0. |
| 6589 | */ |
| 6590 | if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { |
| 6591 | pfn++; |
| 6592 | SetPageReserved(page); |
| 6593 | continue; |
| 6594 | } |
| 6595 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 6596 | BUG_ON(page_count(page)); |
| 6597 | BUG_ON(!PageBuddy(page)); |
| 6598 | order = page_order(page); |
| 6599 | #ifdef CONFIG_DEBUG_VM |
| 6600 | printk(KERN_INFO "remove from free list %lx %d %lx\n", |
| 6601 | pfn, 1 << order, end_pfn); |
| 6602 | #endif |
| 6603 | list_del(&page->lru); |
| 6604 | rmv_page_order(page); |
| 6605 | zone->free_area[order].nr_free--; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 6606 | for (i = 0; i < (1 << order); i++) |
| 6607 | SetPageReserved((page+i)); |
| 6608 | pfn += (1 << order); |
| 6609 | } |
| 6610 | spin_unlock_irqrestore(&zone->lock, flags); |
| 6611 | } |
| 6612 | #endif |
Wu Fengguang | 8d22ba1 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 6613 | |
| 6614 | #ifdef CONFIG_MEMORY_FAILURE |
| 6615 | bool is_free_buddy_page(struct page *page) |
| 6616 | { |
| 6617 | struct zone *zone = page_zone(page); |
| 6618 | unsigned long pfn = page_to_pfn(page); |
| 6619 | unsigned long flags; |
Mel Gorman | 7aeb09f | 2014-06-04 16:10:21 -0700 | [diff] [blame] | 6620 | unsigned int order; |
Wu Fengguang | 8d22ba1 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 6621 | |
| 6622 | spin_lock_irqsave(&zone->lock, flags); |
| 6623 | for (order = 0; order < MAX_ORDER; order++) { |
| 6624 | struct page *page_head = page - (pfn & ((1 << order) - 1)); |
| 6625 | |
| 6626 | if (PageBuddy(page_head) && page_order(page_head) >= order) |
| 6627 | break; |
| 6628 | } |
| 6629 | spin_unlock_irqrestore(&zone->lock, flags); |
| 6630 | |
| 6631 | return order < MAX_ORDER; |
| 6632 | } |
| 6633 | #endif |