Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * SLUB: A slab allocator that limits cache line use instead of queuing |
| 3 | * objects in per cpu and per node lists. |
| 4 | * |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 5 | * The allocator synchronizes using per slab locks or atomic operatios |
| 6 | * and only uses a centralized lock to manage a pool of partial slabs. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 7 | * |
Christoph Lameter | cde5353 | 2008-07-04 09:59:22 -0700 | [diff] [blame] | 8 | * (C) 2007 SGI, Christoph Lameter |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 9 | * (C) 2011 Linux Foundation, Christoph Lameter |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/mm.h> |
Nick Piggin | 1eb5ac6 | 2009-05-05 19:13:44 +1000 | [diff] [blame] | 13 | #include <linux/swap.h> /* struct reclaim_state */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/bit_spinlock.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/bitops.h> |
| 18 | #include <linux/slab.h> |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 19 | #include "slab.h" |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 20 | #include <linux/proc_fs.h> |
Andrew Morton | 3ac38fa | 2013-04-29 15:08:06 -0700 | [diff] [blame] | 21 | #include <linux/notifier.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 22 | #include <linux/seq_file.h> |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 23 | #include <linux/kasan.h> |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 24 | #include <linux/kmemcheck.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 25 | #include <linux/cpu.h> |
| 26 | #include <linux/cpuset.h> |
| 27 | #include <linux/mempolicy.h> |
| 28 | #include <linux/ctype.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 29 | #include <linux/debugobjects.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 30 | #include <linux/kallsyms.h> |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 31 | #include <linux/memory.h> |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 32 | #include <linux/math64.h> |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 33 | #include <linux/fault-inject.h> |
Pekka Enberg | bfa7145 | 2011-07-07 22:47:01 +0300 | [diff] [blame] | 34 | #include <linux/stacktrace.h> |
Christoph Lameter | 4de900b | 2012-01-30 15:53:51 -0600 | [diff] [blame] | 35 | #include <linux/prefetch.h> |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 36 | #include <linux/memcontrol.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 37 | |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 38 | #include <trace/events/kmem.h> |
| 39 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 40 | #include "internal.h" |
| 41 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 42 | /* |
| 43 | * Lock order: |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 44 | * 1. slab_mutex (Global Mutex) |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 45 | * 2. node->list_lock |
| 46 | * 3. slab_lock(page) (Only on some arches and for debugging) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 47 | * |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 48 | * slab_mutex |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 49 | * |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 50 | * The role of the slab_mutex is to protect the list of all the slabs |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 51 | * and to synchronize major metadata changes to slab cache structures. |
| 52 | * |
| 53 | * The slab_lock is only used for debugging and on arches that do not |
| 54 | * have the ability to do a cmpxchg_double. It only protects the second |
| 55 | * double word in the page struct. Meaning |
| 56 | * A. page->freelist -> List of object free in a page |
| 57 | * B. page->counters -> Counters of objects |
| 58 | * C. page->frozen -> frozen state |
| 59 | * |
| 60 | * If a slab is frozen then it is exempt from list management. It is not |
| 61 | * on any list. The processor that froze the slab is the one who can |
| 62 | * perform list operations on the page. Other processors may put objects |
| 63 | * onto the freelist but the processor that froze the slab is the only |
| 64 | * one that can retrieve the objects from the page's freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 65 | * |
| 66 | * The list_lock protects the partial and full list on each node and |
| 67 | * the partial slab counter. If taken then no new slabs may be added or |
| 68 | * removed from the lists nor make the number of partial slabs be modified. |
| 69 | * (Note that the total number of slabs is an atomic value that may be |
| 70 | * modified without taking the list lock). |
| 71 | * |
| 72 | * The list_lock is a centralized lock and thus we avoid taking it as |
| 73 | * much as possible. As long as SLUB does not have to handle partial |
| 74 | * slabs, operations can continue without any centralized lock. F.e. |
| 75 | * allocating a long series of objects that fill up slabs does not require |
| 76 | * the list lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 77 | * Interrupts are disabled during allocation and deallocation in order to |
| 78 | * make the slab allocator safe to use in the context of an irq. In addition |
| 79 | * interrupts are disabled to ensure that the processor does not change |
| 80 | * while handling per_cpu slabs, due to kernel preemption. |
| 81 | * |
| 82 | * SLUB assigns one slab for allocation to each processor. |
| 83 | * Allocations only occur from these slabs called cpu slabs. |
| 84 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 85 | * Slabs with free elements are kept on a partial list and during regular |
| 86 | * operations no list for full slabs is used. If an object in a full slab is |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 87 | * freed then the slab will show up again on the partial lists. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 88 | * We track full slabs for debugging purposes though because otherwise we |
| 89 | * cannot scan all objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 90 | * |
| 91 | * Slabs are freed when they become empty. Teardown and setup is |
| 92 | * minimal so we rely on the page allocators per cpu caches for |
| 93 | * fast frees and allocs. |
| 94 | * |
| 95 | * Overloading of page flags that are otherwise used for LRU management. |
| 96 | * |
Christoph Lameter | 4b6f075 | 2007-05-16 22:10:53 -0700 | [diff] [blame] | 97 | * PageActive The slab is frozen and exempt from list processing. |
| 98 | * This means that the slab is dedicated to a purpose |
| 99 | * such as satisfying allocations for a specific |
| 100 | * processor. Objects may be freed in the slab while |
| 101 | * it is frozen but slab_free will then skip the usual |
| 102 | * list operations. It is up to the processor holding |
| 103 | * the slab to integrate the slab into the slab lists |
| 104 | * when the slab is no longer needed. |
| 105 | * |
| 106 | * One use of this flag is to mark slabs that are |
| 107 | * used for allocations. Then such a slab becomes a cpu |
| 108 | * slab. The cpu slab may be equipped with an additional |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 109 | * freelist that allows lockless access to |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 110 | * free objects in addition to the regular freelist |
| 111 | * that requires the slab lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 112 | * |
| 113 | * PageError Slab requires special handling due to debug |
| 114 | * options set. This moves slab handling out of |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 115 | * the fast path and disables lockless freelists. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 116 | */ |
| 117 | |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 118 | static inline int kmem_cache_debug(struct kmem_cache *s) |
| 119 | { |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 120 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 121 | return unlikely(s->flags & SLAB_DEBUG_FLAGS); |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 122 | #else |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 123 | return 0; |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 124 | #endif |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 125 | } |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 126 | |
Geert Uytterhoeven | 117d54d | 2016-08-04 15:31:55 -0700 | [diff] [blame] | 127 | void *fixup_red_left(struct kmem_cache *s, void *p) |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 128 | { |
| 129 | if (kmem_cache_debug(s) && s->flags & SLAB_RED_ZONE) |
| 130 | p += s->red_left_pad; |
| 131 | |
| 132 | return p; |
| 133 | } |
| 134 | |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 135 | static inline bool kmem_cache_has_cpu_partial(struct kmem_cache *s) |
| 136 | { |
| 137 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
| 138 | return !kmem_cache_debug(s); |
| 139 | #else |
| 140 | return false; |
| 141 | #endif |
| 142 | } |
| 143 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 144 | /* |
| 145 | * Issues still to be resolved: |
| 146 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 147 | * - Support PAGE_ALLOC_DEBUG. Should be easy to do. |
| 148 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 149 | * - Variable sizing of the per node arrays |
| 150 | */ |
| 151 | |
| 152 | /* Enable to test recovery from slab corruption on boot */ |
| 153 | #undef SLUB_RESILIENCY_TEST |
| 154 | |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 155 | /* Enable to log cmpxchg failures */ |
| 156 | #undef SLUB_DEBUG_CMPXCHG |
| 157 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 158 | /* |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 159 | * Mininum number of partial slabs. These will be left on the partial |
| 160 | * lists even if they are empty. kmem_cache_shrink may reclaim them. |
| 161 | */ |
Christoph Lameter | 76be895 | 2007-12-21 14:37:37 -0800 | [diff] [blame] | 162 | #define MIN_PARTIAL 5 |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 163 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 164 | /* |
| 165 | * Maximum number of desirable partial slabs. |
| 166 | * The existence of more partial slabs makes kmem_cache_shrink |
Zhi Yong Wu | 721ae22 | 2013-11-08 20:47:37 +0800 | [diff] [blame] | 167 | * sort the partial list by the number of objects in use. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 168 | */ |
| 169 | #define MAX_PARTIAL 10 |
| 170 | |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 171 | #define DEBUG_DEFAULT_FLAGS (SLAB_CONSISTENCY_CHECKS | SLAB_RED_ZONE | \ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 172 | SLAB_POISON | SLAB_STORE_USER) |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 173 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 174 | /* |
Laura Abbott | 149daaf | 2016-03-15 14:55:09 -0700 | [diff] [blame] | 175 | * These debug flags cannot use CMPXCHG because there might be consistency |
| 176 | * issues when checking or reading debug information |
| 177 | */ |
| 178 | #define SLAB_NO_CMPXCHG (SLAB_CONSISTENCY_CHECKS | SLAB_STORE_USER | \ |
| 179 | SLAB_TRACE) |
| 180 | |
| 181 | |
| 182 | /* |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 183 | * Debugging flags that require metadata to be stored in the slab. These get |
| 184 | * disabled when slub_debug=O is used and a cache's min order increases with |
| 185 | * metadata. |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 186 | */ |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 187 | #define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 188 | |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 189 | #define OO_SHIFT 16 |
| 190 | #define OO_MASK ((1 << OO_SHIFT) - 1) |
Christoph Lameter | 50d5c41 | 2011-06-01 12:25:45 -0500 | [diff] [blame] | 191 | #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */ |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 192 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 193 | /* Internal SLUB flags */ |
Christoph Lameter | f90ec39 | 2010-07-09 14:07:11 -0500 | [diff] [blame] | 194 | #define __OBJECT_POISON 0x80000000UL /* Poison object */ |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 195 | #define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 196 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 197 | #ifdef CONFIG_SMP |
| 198 | static struct notifier_block slab_notifier; |
| 199 | #endif |
| 200 | |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 201 | /* |
| 202 | * Tracking user of a slab. |
| 203 | */ |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 204 | #define TRACK_ADDRS_COUNT 16 |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 205 | struct track { |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 206 | unsigned long addr; /* Called from address */ |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 207 | #ifdef CONFIG_STACKTRACE |
| 208 | unsigned long addrs[TRACK_ADDRS_COUNT]; /* Called from address */ |
| 209 | #endif |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 210 | int cpu; /* Was running on cpu */ |
| 211 | int pid; /* Pid context */ |
| 212 | unsigned long when; /* When did the operation occur */ |
| 213 | }; |
| 214 | |
| 215 | enum track_item { TRACK_ALLOC, TRACK_FREE }; |
| 216 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 217 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 218 | static int sysfs_slab_add(struct kmem_cache *); |
| 219 | static int sysfs_slab_alias(struct kmem_cache *, const char *); |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 220 | static void memcg_propagate_slab_attrs(struct kmem_cache *s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 221 | #else |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 222 | static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } |
| 223 | static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) |
| 224 | { return 0; } |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 225 | static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 226 | #endif |
| 227 | |
Christoph Lameter | 4fdccdf | 2011-03-22 13:35:00 -0500 | [diff] [blame] | 228 | static inline void stat(const struct kmem_cache *s, enum stat_item si) |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 229 | { |
| 230 | #ifdef CONFIG_SLUB_STATS |
Christoph Lameter | 88da03a | 2014-04-07 15:39:42 -0700 | [diff] [blame] | 231 | /* |
| 232 | * The rmw is racy on a preemptible kernel but this is acceptable, so |
| 233 | * avoid this_cpu_add()'s irq-disable overhead. |
| 234 | */ |
| 235 | raw_cpu_inc(s->cpu_slab->stat[si]); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 236 | #endif |
| 237 | } |
| 238 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 239 | /******************************************************************** |
| 240 | * Core slab cache functions |
| 241 | *******************************************************************/ |
| 242 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 243 | static inline void *get_freepointer(struct kmem_cache *s, void *object) |
| 244 | { |
| 245 | return *(void **)(object + s->offset); |
| 246 | } |
| 247 | |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 248 | static void prefetch_freepointer(const struct kmem_cache *s, void *object) |
| 249 | { |
| 250 | prefetch(object + s->offset); |
| 251 | } |
| 252 | |
Christoph Lameter | 1393d9a | 2011-05-16 15:26:08 -0500 | [diff] [blame] | 253 | static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) |
| 254 | { |
| 255 | void *p; |
| 256 | |
Joonsoo Kim | 922d566 | 2016-03-17 14:17:53 -0700 | [diff] [blame] | 257 | if (!debug_pagealloc_enabled()) |
| 258 | return get_freepointer(s, object); |
| 259 | |
Christoph Lameter | 1393d9a | 2011-05-16 15:26:08 -0500 | [diff] [blame] | 260 | probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p)); |
Christoph Lameter | 1393d9a | 2011-05-16 15:26:08 -0500 | [diff] [blame] | 261 | return p; |
| 262 | } |
| 263 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 264 | static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) |
| 265 | { |
| 266 | *(void **)(object + s->offset) = fp; |
| 267 | } |
| 268 | |
| 269 | /* Loop over all objects in a slab */ |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 270 | #define for_each_object(__p, __s, __addr, __objects) \ |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 271 | for (__p = fixup_red_left(__s, __addr); \ |
| 272 | __p < (__addr) + (__objects) * (__s)->size; \ |
| 273 | __p += (__s)->size) |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 274 | |
Wei Yang | 5426664 | 2014-08-06 16:04:42 -0700 | [diff] [blame] | 275 | #define for_each_object_idx(__p, __idx, __s, __addr, __objects) \ |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 276 | for (__p = fixup_red_left(__s, __addr), __idx = 1; \ |
| 277 | __idx <= __objects; \ |
| 278 | __p += (__s)->size, __idx++) |
Wei Yang | 5426664 | 2014-08-06 16:04:42 -0700 | [diff] [blame] | 279 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 280 | /* Determine object index from a given position */ |
| 281 | static inline int slab_index(void *p, struct kmem_cache *s, void *addr) |
| 282 | { |
| 283 | return (p - addr) / s->size; |
| 284 | } |
| 285 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 286 | static inline int order_objects(int order, unsigned long size, int reserved) |
| 287 | { |
| 288 | return ((PAGE_SIZE << order) - reserved) / size; |
| 289 | } |
| 290 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 291 | static inline struct kmem_cache_order_objects oo_make(int order, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 292 | unsigned long size, int reserved) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 293 | { |
| 294 | struct kmem_cache_order_objects x = { |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 295 | (order << OO_SHIFT) + order_objects(order, size, reserved) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 296 | }; |
| 297 | |
| 298 | return x; |
| 299 | } |
| 300 | |
| 301 | static inline int oo_order(struct kmem_cache_order_objects x) |
| 302 | { |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 303 | return x.x >> OO_SHIFT; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | static inline int oo_objects(struct kmem_cache_order_objects x) |
| 307 | { |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 308 | return x.x & OO_MASK; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 309 | } |
| 310 | |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 311 | /* |
| 312 | * Per slab locking using the pagelock |
| 313 | */ |
| 314 | static __always_inline void slab_lock(struct page *page) |
| 315 | { |
Kirill A. Shutemov | 48c935a | 2016-01-15 16:51:24 -0800 | [diff] [blame] | 316 | VM_BUG_ON_PAGE(PageTail(page), page); |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 317 | bit_spin_lock(PG_locked, &page->flags); |
| 318 | } |
| 319 | |
| 320 | static __always_inline void slab_unlock(struct page *page) |
| 321 | { |
Kirill A. Shutemov | 48c935a | 2016-01-15 16:51:24 -0800 | [diff] [blame] | 322 | VM_BUG_ON_PAGE(PageTail(page), page); |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 323 | __bit_spin_unlock(PG_locked, &page->flags); |
| 324 | } |
| 325 | |
Dave Hansen | a032086 | 2014-01-30 15:46:09 -0800 | [diff] [blame] | 326 | static inline void set_page_slub_counters(struct page *page, unsigned long counters_new) |
| 327 | { |
| 328 | struct page tmp; |
| 329 | tmp.counters = counters_new; |
| 330 | /* |
| 331 | * page->counters can cover frozen/inuse/objects as well |
Joonsoo Kim | 0139aa7 | 2016-05-19 17:10:49 -0700 | [diff] [blame] | 332 | * as page->_refcount. If we assign to ->counters directly |
| 333 | * we run the risk of losing updates to page->_refcount, so |
Dave Hansen | a032086 | 2014-01-30 15:46:09 -0800 | [diff] [blame] | 334 | * be careful and only assign to the fields we need. |
| 335 | */ |
| 336 | page->frozen = tmp.frozen; |
| 337 | page->inuse = tmp.inuse; |
| 338 | page->objects = tmp.objects; |
| 339 | } |
| 340 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 341 | /* Interrupts must be disabled (for the fallback code to work right) */ |
| 342 | static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 343 | void *freelist_old, unsigned long counters_old, |
| 344 | void *freelist_new, unsigned long counters_new, |
| 345 | const char *n) |
| 346 | { |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 347 | VM_BUG_ON(!irqs_disabled()); |
Heiko Carstens | 2565409 | 2012-01-12 17:17:33 -0800 | [diff] [blame] | 348 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
| 349 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 350 | if (s->flags & __CMPXCHG_DOUBLE) { |
Jan Beulich | cdcd629 | 2012-01-02 17:02:18 +0000 | [diff] [blame] | 351 | if (cmpxchg_double(&page->freelist, &page->counters, |
Dan Carpenter | 0aa9a13 | 2014-08-06 16:04:48 -0700 | [diff] [blame] | 352 | freelist_old, counters_old, |
| 353 | freelist_new, counters_new)) |
Joe Perches | 6f6528a | 2015-04-14 15:44:31 -0700 | [diff] [blame] | 354 | return true; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 355 | } else |
| 356 | #endif |
| 357 | { |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 358 | slab_lock(page); |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 359 | if (page->freelist == freelist_old && |
| 360 | page->counters == counters_old) { |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 361 | page->freelist = freelist_new; |
Dave Hansen | a032086 | 2014-01-30 15:46:09 -0800 | [diff] [blame] | 362 | set_page_slub_counters(page, counters_new); |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 363 | slab_unlock(page); |
Joe Perches | 6f6528a | 2015-04-14 15:44:31 -0700 | [diff] [blame] | 364 | return true; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 365 | } |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 366 | slab_unlock(page); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | cpu_relax(); |
| 370 | stat(s, CMPXCHG_DOUBLE_FAIL); |
| 371 | |
| 372 | #ifdef SLUB_DEBUG_CMPXCHG |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 373 | pr_info("%s %s: cmpxchg double redo ", n, s->name); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 374 | #endif |
| 375 | |
Joe Perches | 6f6528a | 2015-04-14 15:44:31 -0700 | [diff] [blame] | 376 | return false; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 377 | } |
| 378 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 379 | static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
| 380 | void *freelist_old, unsigned long counters_old, |
| 381 | void *freelist_new, unsigned long counters_new, |
| 382 | const char *n) |
| 383 | { |
Heiko Carstens | 2565409 | 2012-01-12 17:17:33 -0800 | [diff] [blame] | 384 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
| 385 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 386 | if (s->flags & __CMPXCHG_DOUBLE) { |
Jan Beulich | cdcd629 | 2012-01-02 17:02:18 +0000 | [diff] [blame] | 387 | if (cmpxchg_double(&page->freelist, &page->counters, |
Dan Carpenter | 0aa9a13 | 2014-08-06 16:04:48 -0700 | [diff] [blame] | 388 | freelist_old, counters_old, |
| 389 | freelist_new, counters_new)) |
Joe Perches | 6f6528a | 2015-04-14 15:44:31 -0700 | [diff] [blame] | 390 | return true; |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 391 | } else |
| 392 | #endif |
| 393 | { |
| 394 | unsigned long flags; |
| 395 | |
| 396 | local_irq_save(flags); |
| 397 | slab_lock(page); |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 398 | if (page->freelist == freelist_old && |
| 399 | page->counters == counters_old) { |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 400 | page->freelist = freelist_new; |
Dave Hansen | a032086 | 2014-01-30 15:46:09 -0800 | [diff] [blame] | 401 | set_page_slub_counters(page, counters_new); |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 402 | slab_unlock(page); |
| 403 | local_irq_restore(flags); |
Joe Perches | 6f6528a | 2015-04-14 15:44:31 -0700 | [diff] [blame] | 404 | return true; |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 405 | } |
| 406 | slab_unlock(page); |
| 407 | local_irq_restore(flags); |
| 408 | } |
| 409 | |
| 410 | cpu_relax(); |
| 411 | stat(s, CMPXCHG_DOUBLE_FAIL); |
| 412 | |
| 413 | #ifdef SLUB_DEBUG_CMPXCHG |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 414 | pr_info("%s %s: cmpxchg double redo ", n, s->name); |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 415 | #endif |
| 416 | |
Joe Perches | 6f6528a | 2015-04-14 15:44:31 -0700 | [diff] [blame] | 417 | return false; |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 418 | } |
| 419 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 420 | #ifdef CONFIG_SLUB_DEBUG |
| 421 | /* |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 422 | * Determine a map of object in use on a page. |
| 423 | * |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 424 | * Node listlock must be held to guarantee that the page does |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 425 | * not vanish from under us. |
| 426 | */ |
| 427 | static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map) |
| 428 | { |
| 429 | void *p; |
| 430 | void *addr = page_address(page); |
| 431 | |
| 432 | for (p = page->freelist; p; p = get_freepointer(s, p)) |
| 433 | set_bit(slab_index(p, s, addr), map); |
| 434 | } |
| 435 | |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 436 | static inline int size_from_object(struct kmem_cache *s) |
| 437 | { |
| 438 | if (s->flags & SLAB_RED_ZONE) |
| 439 | return s->size - s->red_left_pad; |
| 440 | |
| 441 | return s->size; |
| 442 | } |
| 443 | |
| 444 | static inline void *restore_red_left(struct kmem_cache *s, void *p) |
| 445 | { |
| 446 | if (s->flags & SLAB_RED_ZONE) |
| 447 | p -= s->red_left_pad; |
| 448 | |
| 449 | return p; |
| 450 | } |
| 451 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 452 | /* |
| 453 | * Debug settings: |
| 454 | */ |
Andrey Ryabinin | 89d3c87 | 2015-11-05 18:51:23 -0800 | [diff] [blame] | 455 | #if defined(CONFIG_SLUB_DEBUG_ON) |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 456 | static int slub_debug = DEBUG_DEFAULT_FLAGS; |
| 457 | #else |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 458 | static int slub_debug; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 459 | #endif |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 460 | |
| 461 | static char *slub_debug_slabs; |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 462 | static int disable_higher_order_debug; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 463 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 464 | /* |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 465 | * slub is about to manipulate internal object metadata. This memory lies |
| 466 | * outside the range of the allocated object, so accessing it would normally |
| 467 | * be reported by kasan as a bounds error. metadata_access_enable() is used |
| 468 | * to tell kasan that these accesses are OK. |
| 469 | */ |
| 470 | static inline void metadata_access_enable(void) |
| 471 | { |
| 472 | kasan_disable_current(); |
| 473 | } |
| 474 | |
| 475 | static inline void metadata_access_disable(void) |
| 476 | { |
| 477 | kasan_enable_current(); |
| 478 | } |
| 479 | |
| 480 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 481 | * Object debugging |
| 482 | */ |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 483 | |
| 484 | /* Verify that a pointer has an address that is valid within a slab page */ |
| 485 | static inline int check_valid_pointer(struct kmem_cache *s, |
| 486 | struct page *page, void *object) |
| 487 | { |
| 488 | void *base; |
| 489 | |
| 490 | if (!object) |
| 491 | return 1; |
| 492 | |
| 493 | base = page_address(page); |
| 494 | object = restore_red_left(s, object); |
| 495 | if (object < base || object >= base + page->objects * s->size || |
| 496 | (object - base) % s->size) { |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | return 1; |
| 501 | } |
| 502 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 503 | static void print_section(char *text, u8 *addr, unsigned int length) |
| 504 | { |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 505 | metadata_access_enable(); |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 506 | print_hex_dump(KERN_ERR, text, DUMP_PREFIX_ADDRESS, 16, 1, addr, |
| 507 | length, 1); |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 508 | metadata_access_disable(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 511 | static struct track *get_track(struct kmem_cache *s, void *object, |
| 512 | enum track_item alloc) |
| 513 | { |
| 514 | struct track *p; |
| 515 | |
| 516 | if (s->offset) |
| 517 | p = object + s->offset + sizeof(void *); |
| 518 | else |
| 519 | p = object + s->inuse; |
| 520 | |
| 521 | return p + alloc; |
| 522 | } |
| 523 | |
| 524 | static void set_track(struct kmem_cache *s, void *object, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 525 | enum track_item alloc, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 526 | { |
Akinobu Mita | 1a00df4 | 2009-03-07 00:36:21 +0900 | [diff] [blame] | 527 | struct track *p = get_track(s, object, alloc); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 528 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 529 | if (addr) { |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 530 | #ifdef CONFIG_STACKTRACE |
| 531 | struct stack_trace trace; |
| 532 | int i; |
| 533 | |
| 534 | trace.nr_entries = 0; |
| 535 | trace.max_entries = TRACK_ADDRS_COUNT; |
| 536 | trace.entries = p->addrs; |
| 537 | trace.skip = 3; |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 538 | metadata_access_enable(); |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 539 | save_stack_trace(&trace); |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 540 | metadata_access_disable(); |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 541 | |
| 542 | /* See rant in lockdep.c */ |
| 543 | if (trace.nr_entries != 0 && |
| 544 | trace.entries[trace.nr_entries - 1] == ULONG_MAX) |
| 545 | trace.nr_entries--; |
| 546 | |
| 547 | for (i = trace.nr_entries; i < TRACK_ADDRS_COUNT; i++) |
| 548 | p->addrs[i] = 0; |
| 549 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 550 | p->addr = addr; |
| 551 | p->cpu = smp_processor_id(); |
Alexey Dobriyan | 88e4ccf | 2008-06-23 02:58:37 +0400 | [diff] [blame] | 552 | p->pid = current->pid; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 553 | p->when = jiffies; |
| 554 | } else |
| 555 | memset(p, 0, sizeof(struct track)); |
| 556 | } |
| 557 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 558 | static void init_tracking(struct kmem_cache *s, void *object) |
| 559 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 560 | if (!(s->flags & SLAB_STORE_USER)) |
| 561 | return; |
| 562 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 563 | set_track(s, object, TRACK_FREE, 0UL); |
| 564 | set_track(s, object, TRACK_ALLOC, 0UL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 565 | } |
| 566 | |
| 567 | static void print_track(const char *s, struct track *t) |
| 568 | { |
| 569 | if (!t->addr) |
| 570 | return; |
| 571 | |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 572 | pr_err("INFO: %s in %pS age=%lu cpu=%u pid=%d\n", |
| 573 | s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 574 | #ifdef CONFIG_STACKTRACE |
| 575 | { |
| 576 | int i; |
| 577 | for (i = 0; i < TRACK_ADDRS_COUNT; i++) |
| 578 | if (t->addrs[i]) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 579 | pr_err("\t%pS\n", (void *)t->addrs[i]); |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 580 | else |
| 581 | break; |
| 582 | } |
| 583 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 584 | } |
| 585 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 586 | static void print_tracking(struct kmem_cache *s, void *object) |
| 587 | { |
| 588 | if (!(s->flags & SLAB_STORE_USER)) |
| 589 | return; |
| 590 | |
| 591 | print_track("Allocated", get_track(s, object, TRACK_ALLOC)); |
| 592 | print_track("Freed", get_track(s, object, TRACK_FREE)); |
| 593 | } |
| 594 | |
| 595 | static void print_page_info(struct page *page) |
| 596 | { |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 597 | pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n", |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 598 | page, page->objects, page->inuse, page->freelist, page->flags); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 599 | |
| 600 | } |
| 601 | |
| 602 | static void slab_bug(struct kmem_cache *s, char *fmt, ...) |
| 603 | { |
Fabian Frederick | ecc42fb | 2014-06-04 16:06:35 -0700 | [diff] [blame] | 604 | struct va_format vaf; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 605 | va_list args; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 606 | |
| 607 | va_start(args, fmt); |
Fabian Frederick | ecc42fb | 2014-06-04 16:06:35 -0700 | [diff] [blame] | 608 | vaf.fmt = fmt; |
| 609 | vaf.va = &args; |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 610 | pr_err("=============================================================================\n"); |
Fabian Frederick | ecc42fb | 2014-06-04 16:06:35 -0700 | [diff] [blame] | 611 | pr_err("BUG %s (%s): %pV\n", s->name, print_tainted(), &vaf); |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 612 | pr_err("-----------------------------------------------------------------------------\n\n"); |
Dave Jones | 645df23 | 2012-09-18 15:54:12 -0400 | [diff] [blame] | 613 | |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 614 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
Fabian Frederick | ecc42fb | 2014-06-04 16:06:35 -0700 | [diff] [blame] | 615 | va_end(args); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 616 | } |
| 617 | |
| 618 | static void slab_fix(struct kmem_cache *s, char *fmt, ...) |
| 619 | { |
Fabian Frederick | ecc42fb | 2014-06-04 16:06:35 -0700 | [diff] [blame] | 620 | struct va_format vaf; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 621 | va_list args; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 622 | |
| 623 | va_start(args, fmt); |
Fabian Frederick | ecc42fb | 2014-06-04 16:06:35 -0700 | [diff] [blame] | 624 | vaf.fmt = fmt; |
| 625 | vaf.va = &args; |
| 626 | pr_err("FIX %s: %pV\n", s->name, &vaf); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 627 | va_end(args); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 631 | { |
| 632 | unsigned int off; /* Offset of last byte */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 633 | u8 *addr = page_address(page); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 634 | |
| 635 | print_tracking(s, p); |
| 636 | |
| 637 | print_page_info(page); |
| 638 | |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 639 | pr_err("INFO: Object 0x%p @offset=%tu fp=0x%p\n\n", |
| 640 | p, p - addr, get_freepointer(s, p)); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 641 | |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 642 | if (s->flags & SLAB_RED_ZONE) |
| 643 | print_section("Redzone ", p - s->red_left_pad, s->red_left_pad); |
| 644 | else if (p > addr + 16) |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 645 | print_section("Bytes b4 ", p - 16, 16); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 646 | |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 647 | print_section("Object ", p, min_t(unsigned long, s->object_size, |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 648 | PAGE_SIZE)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 649 | if (s->flags & SLAB_RED_ZONE) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 650 | print_section("Redzone ", p + s->object_size, |
| 651 | s->inuse - s->object_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 652 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 653 | if (s->offset) |
| 654 | off = s->offset + sizeof(void *); |
| 655 | else |
| 656 | off = s->inuse; |
| 657 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 658 | if (s->flags & SLAB_STORE_USER) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 659 | off += 2 * sizeof(struct track); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 660 | |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 661 | off += kasan_metadata_size(s); |
| 662 | |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 663 | if (off != size_from_object(s)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 664 | /* Beginning of the filler is the free pointer */ |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 665 | print_section("Padding ", p + off, size_from_object(s) - off); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 666 | |
| 667 | dump_stack(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 668 | } |
| 669 | |
Andrey Ryabinin | 75c66de | 2015-02-13 14:39:35 -0800 | [diff] [blame] | 670 | void object_err(struct kmem_cache *s, struct page *page, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 671 | u8 *object, char *reason) |
| 672 | { |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 673 | slab_bug(s, "%s", reason); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 674 | print_trailer(s, page, object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 675 | } |
| 676 | |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 677 | static void slab_err(struct kmem_cache *s, struct page *page, |
| 678 | const char *fmt, ...) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 679 | { |
| 680 | va_list args; |
| 681 | char buf[100]; |
| 682 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 683 | va_start(args, fmt); |
| 684 | vsnprintf(buf, sizeof(buf), fmt, args); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 685 | va_end(args); |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 686 | slab_bug(s, "%s", buf); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 687 | print_page_info(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 688 | dump_stack(); |
| 689 | } |
| 690 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 691 | static void init_object(struct kmem_cache *s, void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 692 | { |
| 693 | u8 *p = object; |
| 694 | |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 695 | if (s->flags & SLAB_RED_ZONE) |
| 696 | memset(p - s->red_left_pad, val, s->red_left_pad); |
| 697 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 698 | if (s->flags & __OBJECT_POISON) { |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 699 | memset(p, POISON_FREE, s->object_size - 1); |
| 700 | p[s->object_size - 1] = POISON_END; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | if (s->flags & SLAB_RED_ZONE) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 704 | memset(p + s->object_size, val, s->inuse - s->object_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 705 | } |
| 706 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 707 | static void restore_bytes(struct kmem_cache *s, char *message, u8 data, |
| 708 | void *from, void *to) |
| 709 | { |
| 710 | slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data); |
| 711 | memset(from, data, to - from); |
| 712 | } |
| 713 | |
| 714 | static int check_bytes_and_report(struct kmem_cache *s, struct page *page, |
| 715 | u8 *object, char *what, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 716 | u8 *start, unsigned int value, unsigned int bytes) |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 717 | { |
| 718 | u8 *fault; |
| 719 | u8 *end; |
| 720 | |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 721 | metadata_access_enable(); |
Akinobu Mita | 79824820 | 2011-10-31 17:08:07 -0700 | [diff] [blame] | 722 | fault = memchr_inv(start, value, bytes); |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 723 | metadata_access_disable(); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 724 | if (!fault) |
| 725 | return 1; |
| 726 | |
| 727 | end = start + bytes; |
| 728 | while (end > fault && end[-1] == value) |
| 729 | end--; |
| 730 | |
| 731 | slab_bug(s, "%s overwritten", what); |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 732 | pr_err("INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n", |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 733 | fault, end - 1, fault[0], value); |
| 734 | print_trailer(s, page, object); |
| 735 | |
| 736 | restore_bytes(s, what, value, fault, end); |
| 737 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 738 | } |
| 739 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 740 | /* |
| 741 | * Object layout: |
| 742 | * |
| 743 | * object address |
| 744 | * Bytes of the object to be managed. |
| 745 | * If the freepointer may overlay the object then the free |
| 746 | * pointer is the first word of the object. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 747 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 748 | * Poisoning uses 0x6b (POISON_FREE) and the last byte is |
| 749 | * 0xa5 (POISON_END) |
| 750 | * |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 751 | * object + s->object_size |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 752 | * Padding to reach word boundary. This is also used for Redzoning. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 753 | * Padding is extended by another word if Redzoning is enabled and |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 754 | * object_size == inuse. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 755 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 756 | * We fill with 0xbb (RED_INACTIVE) for inactive objects and with |
| 757 | * 0xcc (RED_ACTIVE) for objects in use. |
| 758 | * |
| 759 | * object + s->inuse |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 760 | * Meta data starts here. |
| 761 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 762 | * A. Free pointer (if we cannot overwrite object on free) |
| 763 | * B. Tracking data for SLAB_STORE_USER |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 764 | * C. Padding to reach required alignment boundary or at mininum |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 765 | * one word if debugging is on to be able to detect writes |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 766 | * before the word boundary. |
| 767 | * |
| 768 | * Padding is done using 0x5a (POISON_INUSE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 769 | * |
| 770 | * object + s->size |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 771 | * Nothing is used beyond s->size. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 772 | * |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 773 | * If slabcaches are merged then the object_size and inuse boundaries are mostly |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 774 | * ignored. And therefore no slab options that rely on these boundaries |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 775 | * may be used with merged slabcaches. |
| 776 | */ |
| 777 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 778 | static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) |
| 779 | { |
| 780 | unsigned long off = s->inuse; /* The end of info */ |
| 781 | |
| 782 | if (s->offset) |
| 783 | /* Freepointer is placed after the object. */ |
| 784 | off += sizeof(void *); |
| 785 | |
| 786 | if (s->flags & SLAB_STORE_USER) |
| 787 | /* We also have user information there */ |
| 788 | off += 2 * sizeof(struct track); |
| 789 | |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 790 | off += kasan_metadata_size(s); |
| 791 | |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 792 | if (size_from_object(s) == off) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 793 | return 1; |
| 794 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 795 | return check_bytes_and_report(s, page, p, "Object padding", |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 796 | p + off, POISON_INUSE, size_from_object(s) - off); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 799 | /* Check the pad bytes at the end of a slab page */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 800 | static int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 801 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 802 | u8 *start; |
| 803 | u8 *fault; |
| 804 | u8 *end; |
| 805 | int length; |
| 806 | int remainder; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 807 | |
| 808 | if (!(s->flags & SLAB_POISON)) |
| 809 | return 1; |
| 810 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 811 | start = page_address(page); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 812 | length = (PAGE_SIZE << compound_order(page)) - s->reserved; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 813 | end = start + length; |
| 814 | remainder = length % s->size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 815 | if (!remainder) |
| 816 | return 1; |
| 817 | |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 818 | metadata_access_enable(); |
Akinobu Mita | 79824820 | 2011-10-31 17:08:07 -0700 | [diff] [blame] | 819 | fault = memchr_inv(end - remainder, POISON_INUSE, remainder); |
Andrey Ryabinin | a79316c | 2015-02-13 14:39:38 -0800 | [diff] [blame] | 820 | metadata_access_disable(); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 821 | if (!fault) |
| 822 | return 1; |
| 823 | while (end > fault && end[-1] == POISON_INUSE) |
| 824 | end--; |
| 825 | |
| 826 | slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1); |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 827 | print_section("Padding ", end - remainder, remainder); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 828 | |
Eric Dumazet | 8a3d271 | 2009-09-03 16:08:06 +0200 | [diff] [blame] | 829 | restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 830 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 831 | } |
| 832 | |
| 833 | static int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 834 | void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 835 | { |
| 836 | u8 *p = object; |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 837 | u8 *endobject = object + s->object_size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 838 | |
| 839 | if (s->flags & SLAB_RED_ZONE) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 840 | if (!check_bytes_and_report(s, page, object, "Redzone", |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 841 | object - s->red_left_pad, val, s->red_left_pad)) |
| 842 | return 0; |
| 843 | |
| 844 | if (!check_bytes_and_report(s, page, object, "Redzone", |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 845 | endobject, val, s->inuse - s->object_size)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 846 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 847 | } else { |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 848 | if ((s->flags & SLAB_POISON) && s->object_size < s->inuse) { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 849 | check_bytes_and_report(s, page, p, "Alignment padding", |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 850 | endobject, POISON_INUSE, |
| 851 | s->inuse - s->object_size); |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 852 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 853 | } |
| 854 | |
| 855 | if (s->flags & SLAB_POISON) { |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 856 | if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) && |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 857 | (!check_bytes_and_report(s, page, p, "Poison", p, |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 858 | POISON_FREE, s->object_size - 1) || |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 859 | !check_bytes_and_report(s, page, p, "Poison", |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 860 | p + s->object_size - 1, POISON_END, 1))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 861 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 862 | /* |
| 863 | * check_pad_bytes cleans up on its own. |
| 864 | */ |
| 865 | check_pad_bytes(s, page, p); |
| 866 | } |
| 867 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 868 | if (!s->offset && val == SLUB_RED_ACTIVE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 869 | /* |
| 870 | * Object and freepointer overlap. Cannot check |
| 871 | * freepointer while object is allocated. |
| 872 | */ |
| 873 | return 1; |
| 874 | |
| 875 | /* Check free pointer validity */ |
| 876 | if (!check_valid_pointer(s, page, get_freepointer(s, p))) { |
| 877 | object_err(s, page, p, "Freepointer corrupt"); |
| 878 | /* |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 879 | * No choice but to zap it and thus lose the remainder |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 880 | * of the free objects in this slab. May cause |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 881 | * another error because the object count is now wrong. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 882 | */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 883 | set_freepointer(s, p, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 884 | return 0; |
| 885 | } |
| 886 | return 1; |
| 887 | } |
| 888 | |
| 889 | static int check_slab(struct kmem_cache *s, struct page *page) |
| 890 | { |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 891 | int maxobj; |
| 892 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 893 | VM_BUG_ON(!irqs_disabled()); |
| 894 | |
| 895 | if (!PageSlab(page)) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 896 | slab_err(s, page, "Not a valid slab page"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 897 | return 0; |
| 898 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 899 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 900 | maxobj = order_objects(compound_order(page), s->size, s->reserved); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 901 | if (page->objects > maxobj) { |
| 902 | slab_err(s, page, "objects %u > max %u", |
Andrey Ryabinin | f6edde9 | 2014-12-10 15:42:22 -0800 | [diff] [blame] | 903 | page->objects, maxobj); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 904 | return 0; |
| 905 | } |
| 906 | if (page->inuse > page->objects) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 907 | slab_err(s, page, "inuse %u > max %u", |
Andrey Ryabinin | f6edde9 | 2014-12-10 15:42:22 -0800 | [diff] [blame] | 908 | page->inuse, page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 909 | return 0; |
| 910 | } |
| 911 | /* Slab_pad_check fixes things up after itself */ |
| 912 | slab_pad_check(s, page); |
| 913 | return 1; |
| 914 | } |
| 915 | |
| 916 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 917 | * Determine if a certain object on a page is on the freelist. Must hold the |
| 918 | * slab lock to guarantee that the chains are in a consistent state. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 919 | */ |
| 920 | static int on_freelist(struct kmem_cache *s, struct page *page, void *search) |
| 921 | { |
| 922 | int nr = 0; |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 923 | void *fp; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 924 | void *object = NULL; |
Andrey Ryabinin | f6edde9 | 2014-12-10 15:42:22 -0800 | [diff] [blame] | 925 | int max_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 926 | |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 927 | fp = page->freelist; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 928 | while (fp && nr <= page->objects) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 929 | if (fp == search) |
| 930 | return 1; |
| 931 | if (!check_valid_pointer(s, page, fp)) { |
| 932 | if (object) { |
| 933 | object_err(s, page, object, |
| 934 | "Freechain corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 935 | set_freepointer(s, object, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 936 | } else { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 937 | slab_err(s, page, "Freepointer corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 938 | page->freelist = NULL; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 939 | page->inuse = page->objects; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 940 | slab_fix(s, "Freelist cleared"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 941 | return 0; |
| 942 | } |
| 943 | break; |
| 944 | } |
| 945 | object = fp; |
| 946 | fp = get_freepointer(s, object); |
| 947 | nr++; |
| 948 | } |
| 949 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 950 | max_objects = order_objects(compound_order(page), s->size, s->reserved); |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 951 | if (max_objects > MAX_OBJS_PER_PAGE) |
| 952 | max_objects = MAX_OBJS_PER_PAGE; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 953 | |
| 954 | if (page->objects != max_objects) { |
Joe Perches | 756a025 | 2016-03-17 14:19:47 -0700 | [diff] [blame] | 955 | slab_err(s, page, "Wrong number of objects. Found %d but should be %d", |
| 956 | page->objects, max_objects); |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 957 | page->objects = max_objects; |
| 958 | slab_fix(s, "Number of objects adjusted."); |
| 959 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 960 | if (page->inuse != page->objects - nr) { |
Joe Perches | 756a025 | 2016-03-17 14:19:47 -0700 | [diff] [blame] | 961 | slab_err(s, page, "Wrong object count. Counter is %d but counted were %d", |
| 962 | page->inuse, page->objects - nr); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 963 | page->inuse = page->objects - nr; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 964 | slab_fix(s, "Object count adjusted."); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 965 | } |
| 966 | return search == NULL; |
| 967 | } |
| 968 | |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 969 | static void trace(struct kmem_cache *s, struct page *page, void *object, |
| 970 | int alloc) |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 971 | { |
| 972 | if (s->flags & SLAB_TRACE) { |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 973 | pr_info("TRACE %s %s 0x%p inuse=%d fp=0x%p\n", |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 974 | s->name, |
| 975 | alloc ? "alloc" : "free", |
| 976 | object, page->inuse, |
| 977 | page->freelist); |
| 978 | |
| 979 | if (!alloc) |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 980 | print_section("Object ", (void *)object, |
| 981 | s->object_size); |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 982 | |
| 983 | dump_stack(); |
| 984 | } |
| 985 | } |
| 986 | |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 987 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 988 | * Tracking of fully allocated slabs for debugging purposes. |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 989 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 990 | static void add_full(struct kmem_cache *s, |
| 991 | struct kmem_cache_node *n, struct page *page) |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 992 | { |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 993 | if (!(s->flags & SLAB_STORE_USER)) |
| 994 | return; |
| 995 | |
David Rientjes | 255d088 | 2014-02-10 14:25:39 -0800 | [diff] [blame] | 996 | lockdep_assert_held(&n->list_lock); |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 997 | list_add(&page->lru, &n->full); |
| 998 | } |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 999 | |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 1000 | static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page) |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1001 | { |
| 1002 | if (!(s->flags & SLAB_STORE_USER)) |
| 1003 | return; |
| 1004 | |
David Rientjes | 255d088 | 2014-02-10 14:25:39 -0800 | [diff] [blame] | 1005 | lockdep_assert_held(&n->list_lock); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 1006 | list_del(&page->lru); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 1007 | } |
| 1008 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1009 | /* Tracking of the number of slabs for debugging purposes */ |
| 1010 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 1011 | { |
| 1012 | struct kmem_cache_node *n = get_node(s, node); |
| 1013 | |
| 1014 | return atomic_long_read(&n->nr_slabs); |
| 1015 | } |
| 1016 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1017 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 1018 | { |
| 1019 | return atomic_long_read(&n->nr_slabs); |
| 1020 | } |
| 1021 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1022 | static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects) |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1023 | { |
| 1024 | struct kmem_cache_node *n = get_node(s, node); |
| 1025 | |
| 1026 | /* |
| 1027 | * May be called early in order to allocate a slab for the |
| 1028 | * kmem_cache_node structure. Solve the chicken-egg |
| 1029 | * dilemma by deferring the increment of the count during |
| 1030 | * bootstrap (see early_kmem_cache_node_alloc). |
| 1031 | */ |
Joonsoo Kim | 338b264 | 2013-01-21 17:01:27 +0900 | [diff] [blame] | 1032 | if (likely(n)) { |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1033 | atomic_long_inc(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1034 | atomic_long_add(objects, &n->total_objects); |
| 1035 | } |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1036 | } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1037 | static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects) |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1038 | { |
| 1039 | struct kmem_cache_node *n = get_node(s, node); |
| 1040 | |
| 1041 | atomic_long_dec(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1042 | atomic_long_sub(objects, &n->total_objects); |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1043 | } |
| 1044 | |
| 1045 | /* Object debug checks for alloc/free paths */ |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1046 | static void setup_object_debug(struct kmem_cache *s, struct page *page, |
| 1047 | void *object) |
| 1048 | { |
| 1049 | if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON))) |
| 1050 | return; |
| 1051 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1052 | init_object(s, object, SLUB_RED_INACTIVE); |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1053 | init_tracking(s, object); |
| 1054 | } |
| 1055 | |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1056 | static inline int alloc_consistency_checks(struct kmem_cache *s, |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 1057 | struct page *page, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1058 | void *object, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1059 | { |
| 1060 | if (!check_slab(s, page)) |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1061 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1062 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1063 | if (!check_valid_pointer(s, page, object)) { |
| 1064 | object_err(s, page, object, "Freelist Pointer check fails"); |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1065 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1066 | } |
| 1067 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1068 | if (!check_object(s, page, object, SLUB_RED_INACTIVE)) |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1069 | return 0; |
| 1070 | |
| 1071 | return 1; |
| 1072 | } |
| 1073 | |
| 1074 | static noinline int alloc_debug_processing(struct kmem_cache *s, |
| 1075 | struct page *page, |
| 1076 | void *object, unsigned long addr) |
| 1077 | { |
| 1078 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { |
| 1079 | if (!alloc_consistency_checks(s, page, object, addr)) |
| 1080 | goto bad; |
| 1081 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1082 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1083 | /* Success perform special debug activities for allocs */ |
| 1084 | if (s->flags & SLAB_STORE_USER) |
| 1085 | set_track(s, object, TRACK_ALLOC, addr); |
| 1086 | trace(s, page, object, 1); |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1087 | init_object(s, object, SLUB_RED_ACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1088 | return 1; |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1089 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1090 | bad: |
| 1091 | if (PageSlab(page)) { |
| 1092 | /* |
| 1093 | * If this is a slab page then lets do the best we can |
| 1094 | * to avoid issues in the future. Marking all objects |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1095 | * as used avoids touching the remaining objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1096 | */ |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1097 | slab_fix(s, "Marking all objects used"); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 1098 | page->inuse = page->objects; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1099 | page->freelist = NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1100 | } |
| 1101 | return 0; |
| 1102 | } |
| 1103 | |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1104 | static inline int free_consistency_checks(struct kmem_cache *s, |
| 1105 | struct page *page, void *object, unsigned long addr) |
| 1106 | { |
| 1107 | if (!check_valid_pointer(s, page, object)) { |
| 1108 | slab_err(s, page, "Invalid object pointer 0x%p", object); |
| 1109 | return 0; |
| 1110 | } |
| 1111 | |
| 1112 | if (on_freelist(s, page, object)) { |
| 1113 | object_err(s, page, object, "Object already free"); |
| 1114 | return 0; |
| 1115 | } |
| 1116 | |
| 1117 | if (!check_object(s, page, object, SLUB_RED_ACTIVE)) |
| 1118 | return 0; |
| 1119 | |
| 1120 | if (unlikely(s != page->slab_cache)) { |
| 1121 | if (!PageSlab(page)) { |
Joe Perches | 756a025 | 2016-03-17 14:19:47 -0700 | [diff] [blame] | 1122 | slab_err(s, page, "Attempt to free object(0x%p) outside of slab", |
| 1123 | object); |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1124 | } else if (!page->slab_cache) { |
| 1125 | pr_err("SLUB <none>: no slab for object 0x%p.\n", |
| 1126 | object); |
| 1127 | dump_stack(); |
| 1128 | } else |
| 1129 | object_err(s, page, object, |
| 1130 | "page slab pointer corrupt."); |
| 1131 | return 0; |
| 1132 | } |
| 1133 | return 1; |
| 1134 | } |
| 1135 | |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1136 | /* Supports checking bulk free of a constructed freelist */ |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 1137 | static noinline int free_debug_processing( |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1138 | struct kmem_cache *s, struct page *page, |
| 1139 | void *head, void *tail, int bulk_cnt, |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 1140 | unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1141 | { |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1142 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1143 | void *object = head; |
| 1144 | int cnt = 0; |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 1145 | unsigned long uninitialized_var(flags); |
Laura Abbott | 804aa13 | 2016-03-15 14:55:02 -0700 | [diff] [blame] | 1146 | int ret = 0; |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1147 | |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 1148 | spin_lock_irqsave(&n->list_lock, flags); |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1149 | slab_lock(page); |
| 1150 | |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1151 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { |
| 1152 | if (!check_slab(s, page)) |
| 1153 | goto out; |
| 1154 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1155 | |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1156 | next_object: |
| 1157 | cnt++; |
| 1158 | |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1159 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { |
| 1160 | if (!free_consistency_checks(s, page, object, addr)) |
| 1161 | goto out; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1162 | } |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1163 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1164 | if (s->flags & SLAB_STORE_USER) |
| 1165 | set_track(s, object, TRACK_FREE, addr); |
| 1166 | trace(s, page, object, 0); |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1167 | /* Freepointer not overwritten by init_object(), SLAB_POISON moved it */ |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1168 | init_object(s, object, SLUB_RED_INACTIVE); |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1169 | |
| 1170 | /* Reached end of constructed freelist yet? */ |
| 1171 | if (object != tail) { |
| 1172 | object = get_freepointer(s, object); |
| 1173 | goto next_object; |
| 1174 | } |
Laura Abbott | 804aa13 | 2016-03-15 14:55:02 -0700 | [diff] [blame] | 1175 | ret = 1; |
| 1176 | |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1177 | out: |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1178 | if (cnt != bulk_cnt) |
| 1179 | slab_err(s, page, "Bulk freelist count(%d) invalid(%d)\n", |
| 1180 | bulk_cnt, cnt); |
| 1181 | |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1182 | slab_unlock(page); |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 1183 | spin_unlock_irqrestore(&n->list_lock, flags); |
Laura Abbott | 804aa13 | 2016-03-15 14:55:02 -0700 | [diff] [blame] | 1184 | if (!ret) |
| 1185 | slab_fix(s, "Object at 0x%p not freed", object); |
| 1186 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1189 | static int __init setup_slub_debug(char *str) |
| 1190 | { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1191 | slub_debug = DEBUG_DEFAULT_FLAGS; |
| 1192 | if (*str++ != '=' || !*str) |
| 1193 | /* |
| 1194 | * No options specified. Switch on full debugging. |
| 1195 | */ |
| 1196 | goto out; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1197 | |
| 1198 | if (*str == ',') |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1199 | /* |
| 1200 | * No options but restriction on slabs. This means full |
| 1201 | * debugging for slabs matching a pattern. |
| 1202 | */ |
| 1203 | goto check_slabs; |
| 1204 | |
| 1205 | slub_debug = 0; |
| 1206 | if (*str == '-') |
| 1207 | /* |
| 1208 | * Switch off all debugging measures. |
| 1209 | */ |
| 1210 | goto out; |
| 1211 | |
| 1212 | /* |
| 1213 | * Determine which debug features should be switched on |
| 1214 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1215 | for (; *str && *str != ','; str++) { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1216 | switch (tolower(*str)) { |
| 1217 | case 'f': |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1218 | slub_debug |= SLAB_CONSISTENCY_CHECKS; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1219 | break; |
| 1220 | case 'z': |
| 1221 | slub_debug |= SLAB_RED_ZONE; |
| 1222 | break; |
| 1223 | case 'p': |
| 1224 | slub_debug |= SLAB_POISON; |
| 1225 | break; |
| 1226 | case 'u': |
| 1227 | slub_debug |= SLAB_STORE_USER; |
| 1228 | break; |
| 1229 | case 't': |
| 1230 | slub_debug |= SLAB_TRACE; |
| 1231 | break; |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 1232 | case 'a': |
| 1233 | slub_debug |= SLAB_FAILSLAB; |
| 1234 | break; |
Chris J Arges | 08303a7 | 2015-04-14 15:44:25 -0700 | [diff] [blame] | 1235 | case 'o': |
| 1236 | /* |
| 1237 | * Avoid enabling debugging on caches if its minimum |
| 1238 | * order would increase as a result. |
| 1239 | */ |
| 1240 | disable_higher_order_debug = 1; |
| 1241 | break; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1242 | default: |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 1243 | pr_err("slub_debug option '%c' unknown. skipped\n", |
| 1244 | *str); |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1245 | } |
| 1246 | } |
| 1247 | |
| 1248 | check_slabs: |
| 1249 | if (*str == ',') |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1250 | slub_debug_slabs = str + 1; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1251 | out: |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1252 | return 1; |
| 1253 | } |
| 1254 | |
| 1255 | __setup("slub_debug", setup_slub_debug); |
| 1256 | |
Joonsoo Kim | 423c929 | 2014-10-09 15:26:22 -0700 | [diff] [blame] | 1257 | unsigned long kmem_cache_flags(unsigned long object_size, |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1258 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1259 | void (*ctor)(void *)) |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1260 | { |
| 1261 | /* |
Christoph Lameter | e153362 | 2008-02-15 23:45:24 -0800 | [diff] [blame] | 1262 | * Enable debugging if selected on the kernel commandline. |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1263 | */ |
Christoph Lameter | c6f58d9 | 2013-11-07 16:29:15 +0000 | [diff] [blame] | 1264 | if (slub_debug && (!slub_debug_slabs || (name && |
| 1265 | !strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs))))) |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 1266 | flags |= slub_debug; |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1267 | |
| 1268 | return flags; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1269 | } |
Jesper Dangaard Brouer | b4a6471 | 2015-11-20 15:57:41 -0800 | [diff] [blame] | 1270 | #else /* !CONFIG_SLUB_DEBUG */ |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1271 | static inline void setup_object_debug(struct kmem_cache *s, |
| 1272 | struct page *page, void *object) {} |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1273 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1274 | static inline int alloc_debug_processing(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1275 | struct page *page, void *object, unsigned long addr) { return 0; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1276 | |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 1277 | static inline int free_debug_processing( |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1278 | struct kmem_cache *s, struct page *page, |
| 1279 | void *head, void *tail, int bulk_cnt, |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 1280 | unsigned long addr) { return 0; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1281 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1282 | static inline int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 1283 | { return 1; } |
| 1284 | static inline int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1285 | void *object, u8 val) { return 1; } |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1286 | static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, |
| 1287 | struct page *page) {} |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 1288 | static inline void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, |
| 1289 | struct page *page) {} |
Joonsoo Kim | 423c929 | 2014-10-09 15:26:22 -0700 | [diff] [blame] | 1290 | unsigned long kmem_cache_flags(unsigned long object_size, |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1291 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1292 | void (*ctor)(void *)) |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1293 | { |
| 1294 | return flags; |
| 1295 | } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1296 | #define slub_debug 0 |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1297 | |
Ingo Molnar | fdaa45e | 2009-09-15 11:00:26 +0200 | [diff] [blame] | 1298 | #define disable_higher_order_debug 0 |
| 1299 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1300 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 1301 | { return 0; } |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1302 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 1303 | { return 0; } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1304 | static inline void inc_slabs_node(struct kmem_cache *s, int node, |
| 1305 | int objects) {} |
| 1306 | static inline void dec_slabs_node(struct kmem_cache *s, int node, |
| 1307 | int objects) {} |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1308 | |
Andrey Ryabinin | 02e72cc | 2014-08-06 16:04:18 -0700 | [diff] [blame] | 1309 | #endif /* CONFIG_SLUB_DEBUG */ |
| 1310 | |
| 1311 | /* |
| 1312 | * Hooks for other subsystems that check memory allocations. In a typical |
| 1313 | * production configuration these hooks all should produce no code at all. |
| 1314 | */ |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1315 | static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) |
| 1316 | { |
| 1317 | kmemleak_alloc(ptr, size, 1, flags); |
Alexander Potapenko | 505f5dc | 2016-03-25 14:22:02 -0700 | [diff] [blame] | 1318 | kasan_kmalloc_large(ptr, size, flags); |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1319 | } |
| 1320 | |
| 1321 | static inline void kfree_hook(const void *x) |
| 1322 | { |
| 1323 | kmemleak_free(x); |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 1324 | kasan_kfree_large(x); |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1325 | } |
| 1326 | |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 1327 | static inline void *slab_free_hook(struct kmem_cache *s, void *x) |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1328 | { |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 1329 | void *freeptr; |
| 1330 | |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1331 | kmemleak_free_recursive(x, s->flags); |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1332 | |
Andrey Ryabinin | 02e72cc | 2014-08-06 16:04:18 -0700 | [diff] [blame] | 1333 | /* |
| 1334 | * Trouble is that we may no longer disable interrupts in the fast path |
| 1335 | * So in order to make the debug calls that expect irqs to be |
| 1336 | * disabled we need to disable interrupts temporarily. |
| 1337 | */ |
| 1338 | #if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP) |
| 1339 | { |
| 1340 | unsigned long flags; |
| 1341 | |
| 1342 | local_irq_save(flags); |
| 1343 | kmemcheck_slab_free(s, x, s->object_size); |
| 1344 | debug_check_no_locks_freed(x, s->object_size); |
| 1345 | local_irq_restore(flags); |
| 1346 | } |
| 1347 | #endif |
| 1348 | if (!(s->flags & SLAB_DEBUG_OBJECTS)) |
| 1349 | debug_check_no_obj_freed(x, s->object_size); |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 1350 | |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 1351 | freeptr = get_freepointer(s, x); |
| 1352 | /* |
| 1353 | * kasan_slab_free() may put x into memory quarantine, delaying its |
| 1354 | * reuse. In this case the object's freelist pointer is changed. |
| 1355 | */ |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 1356 | kasan_slab_free(s, x); |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 1357 | return freeptr; |
Andrey Ryabinin | 02e72cc | 2014-08-06 16:04:18 -0700 | [diff] [blame] | 1358 | } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1359 | |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1360 | static inline void slab_free_freelist_hook(struct kmem_cache *s, |
| 1361 | void *head, void *tail) |
| 1362 | { |
| 1363 | /* |
| 1364 | * Compiler cannot detect this function can be removed if slab_free_hook() |
| 1365 | * evaluates to nothing. Thus, catch all relevant config debug options here. |
| 1366 | */ |
| 1367 | #if defined(CONFIG_KMEMCHECK) || \ |
| 1368 | defined(CONFIG_LOCKDEP) || \ |
| 1369 | defined(CONFIG_DEBUG_KMEMLEAK) || \ |
| 1370 | defined(CONFIG_DEBUG_OBJECTS_FREE) || \ |
| 1371 | defined(CONFIG_KASAN) |
| 1372 | |
| 1373 | void *object = head; |
| 1374 | void *tail_obj = tail ? : head; |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 1375 | void *freeptr; |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1376 | |
| 1377 | do { |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 1378 | freeptr = slab_free_hook(s, object); |
| 1379 | } while ((object != tail_obj) && (object = freeptr)); |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 1380 | #endif |
| 1381 | } |
| 1382 | |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1383 | static void setup_object(struct kmem_cache *s, struct page *page, |
| 1384 | void *object) |
| 1385 | { |
| 1386 | setup_object_debug(s, page, object); |
Andrey Ryabinin | b3cbd9b | 2016-08-02 14:02:52 -0700 | [diff] [blame] | 1387 | kasan_init_slab_obj(s, object); |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1388 | if (unlikely(s->ctor)) { |
| 1389 | kasan_unpoison_object_data(s, object); |
| 1390 | s->ctor(object); |
| 1391 | kasan_poison_object_data(s, object); |
| 1392 | } |
| 1393 | } |
| 1394 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1395 | /* |
| 1396 | * Slab allocation and freeing |
| 1397 | */ |
Vladimir Davydov | 5dfb417 | 2014-06-04 16:06:38 -0700 | [diff] [blame] | 1398 | static inline struct page *alloc_slab_page(struct kmem_cache *s, |
| 1399 | gfp_t flags, int node, struct kmem_cache_order_objects oo) |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1400 | { |
Vladimir Davydov | 5dfb417 | 2014-06-04 16:06:38 -0700 | [diff] [blame] | 1401 | struct page *page; |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1402 | int order = oo_order(oo); |
| 1403 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1404 | flags |= __GFP_NOTRACK; |
| 1405 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1406 | if (node == NUMA_NO_NODE) |
Vladimir Davydov | 5dfb417 | 2014-06-04 16:06:38 -0700 | [diff] [blame] | 1407 | page = alloc_pages(flags, order); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1408 | else |
Vlastimil Babka | 96db800 | 2015-09-08 15:03:50 -0700 | [diff] [blame] | 1409 | page = __alloc_pages_node(node, flags, order); |
Vladimir Davydov | 5dfb417 | 2014-06-04 16:06:38 -0700 | [diff] [blame] | 1410 | |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 1411 | if (page && memcg_charge_slab(page, flags, order, s)) { |
| 1412 | __free_pages(page, order); |
| 1413 | page = NULL; |
| 1414 | } |
Vladimir Davydov | 5dfb417 | 2014-06-04 16:06:38 -0700 | [diff] [blame] | 1415 | |
| 1416 | return page; |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1417 | } |
| 1418 | |
Thomas Garnier | 210e7a4 | 2016-07-26 15:21:59 -0700 | [diff] [blame] | 1419 | #ifdef CONFIG_SLAB_FREELIST_RANDOM |
| 1420 | /* Pre-initialize the random sequence cache */ |
| 1421 | static int init_cache_random_seq(struct kmem_cache *s) |
| 1422 | { |
| 1423 | int err; |
| 1424 | unsigned long i, count = oo_objects(s->oo); |
| 1425 | |
| 1426 | err = cache_random_seq_create(s, count, GFP_KERNEL); |
| 1427 | if (err) { |
| 1428 | pr_err("SLUB: Unable to initialize free list for %s\n", |
| 1429 | s->name); |
| 1430 | return err; |
| 1431 | } |
| 1432 | |
| 1433 | /* Transform to an offset on the set of pages */ |
| 1434 | if (s->random_seq) { |
| 1435 | for (i = 0; i < count; i++) |
| 1436 | s->random_seq[i] *= s->size; |
| 1437 | } |
| 1438 | return 0; |
| 1439 | } |
| 1440 | |
| 1441 | /* Initialize each random sequence freelist per cache */ |
| 1442 | static void __init init_freelist_randomization(void) |
| 1443 | { |
| 1444 | struct kmem_cache *s; |
| 1445 | |
| 1446 | mutex_lock(&slab_mutex); |
| 1447 | |
| 1448 | list_for_each_entry(s, &slab_caches, list) |
| 1449 | init_cache_random_seq(s); |
| 1450 | |
| 1451 | mutex_unlock(&slab_mutex); |
| 1452 | } |
| 1453 | |
| 1454 | /* Get the next entry on the pre-computed freelist randomized */ |
| 1455 | static void *next_freelist_entry(struct kmem_cache *s, struct page *page, |
| 1456 | unsigned long *pos, void *start, |
| 1457 | unsigned long page_limit, |
| 1458 | unsigned long freelist_count) |
| 1459 | { |
| 1460 | unsigned int idx; |
| 1461 | |
| 1462 | /* |
| 1463 | * If the target page allocation failed, the number of objects on the |
| 1464 | * page might be smaller than the usual size defined by the cache. |
| 1465 | */ |
| 1466 | do { |
| 1467 | idx = s->random_seq[*pos]; |
| 1468 | *pos += 1; |
| 1469 | if (*pos >= freelist_count) |
| 1470 | *pos = 0; |
| 1471 | } while (unlikely(idx >= page_limit)); |
| 1472 | |
| 1473 | return (char *)start + idx; |
| 1474 | } |
| 1475 | |
| 1476 | /* Shuffle the single linked freelist based on a random pre-computed sequence */ |
| 1477 | static bool shuffle_freelist(struct kmem_cache *s, struct page *page) |
| 1478 | { |
| 1479 | void *start; |
| 1480 | void *cur; |
| 1481 | void *next; |
| 1482 | unsigned long idx, pos, page_limit, freelist_count; |
| 1483 | |
| 1484 | if (page->objects < 2 || !s->random_seq) |
| 1485 | return false; |
| 1486 | |
| 1487 | freelist_count = oo_objects(s->oo); |
| 1488 | pos = get_random_int() % freelist_count; |
| 1489 | |
| 1490 | page_limit = page->objects * s->size; |
| 1491 | start = fixup_red_left(s, page_address(page)); |
| 1492 | |
| 1493 | /* First entry is used as the base of the freelist */ |
| 1494 | cur = next_freelist_entry(s, page, &pos, start, page_limit, |
| 1495 | freelist_count); |
| 1496 | page->freelist = cur; |
| 1497 | |
| 1498 | for (idx = 1; idx < page->objects; idx++) { |
| 1499 | setup_object(s, page, cur); |
| 1500 | next = next_freelist_entry(s, page, &pos, start, page_limit, |
| 1501 | freelist_count); |
| 1502 | set_freepointer(s, cur, next); |
| 1503 | cur = next; |
| 1504 | } |
| 1505 | setup_object(s, page, cur); |
| 1506 | set_freepointer(s, cur, NULL); |
| 1507 | |
| 1508 | return true; |
| 1509 | } |
| 1510 | #else |
| 1511 | static inline int init_cache_random_seq(struct kmem_cache *s) |
| 1512 | { |
| 1513 | return 0; |
| 1514 | } |
| 1515 | static inline void init_freelist_randomization(void) { } |
| 1516 | static inline bool shuffle_freelist(struct kmem_cache *s, struct page *page) |
| 1517 | { |
| 1518 | return false; |
| 1519 | } |
| 1520 | #endif /* CONFIG_SLAB_FREELIST_RANDOM */ |
| 1521 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1522 | static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1523 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1524 | struct page *page; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1525 | struct kmem_cache_order_objects oo = s->oo; |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1526 | gfp_t alloc_gfp; |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1527 | void *start, *p; |
| 1528 | int idx, order; |
Thomas Garnier | 210e7a4 | 2016-07-26 15:21:59 -0700 | [diff] [blame] | 1529 | bool shuffle; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1530 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1531 | flags &= gfp_allowed_mask; |
| 1532 | |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1533 | if (gfpflags_allow_blocking(flags)) |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1534 | local_irq_enable(); |
| 1535 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 1536 | flags |= s->allocflags; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1537 | |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1538 | /* |
| 1539 | * Let the initial higher-order allocation fail under memory pressure |
| 1540 | * so we fall-back to the minimum order allocation. |
| 1541 | */ |
| 1542 | alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1543 | if ((alloc_gfp & __GFP_DIRECT_RECLAIM) && oo_order(oo) > oo_order(s->min)) |
Mel Gorman | 444eb2a4 | 2016-03-17 14:19:23 -0700 | [diff] [blame] | 1544 | alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~(__GFP_RECLAIM|__GFP_NOFAIL); |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1545 | |
Vladimir Davydov | 5dfb417 | 2014-06-04 16:06:38 -0700 | [diff] [blame] | 1546 | page = alloc_slab_page(s, alloc_gfp, node, oo); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1547 | if (unlikely(!page)) { |
| 1548 | oo = s->min; |
Joonsoo Kim | 80c3a99 | 2014-03-12 17:26:20 +0900 | [diff] [blame] | 1549 | alloc_gfp = flags; |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1550 | /* |
| 1551 | * Allocation may have failed due to fragmentation. |
| 1552 | * Try a lower order alloc if possible |
| 1553 | */ |
Vladimir Davydov | 5dfb417 | 2014-06-04 16:06:38 -0700 | [diff] [blame] | 1554 | page = alloc_slab_page(s, alloc_gfp, node, oo); |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1555 | if (unlikely(!page)) |
| 1556 | goto out; |
| 1557 | stat(s, ORDER_FALLBACK); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1558 | } |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1559 | |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1560 | if (kmemcheck_enabled && |
| 1561 | !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1562 | int pages = 1 << oo_order(oo); |
| 1563 | |
Joonsoo Kim | 80c3a99 | 2014-03-12 17:26:20 +0900 | [diff] [blame] | 1564 | kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node); |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1565 | |
| 1566 | /* |
| 1567 | * Objects from caches that have a constructor don't get |
| 1568 | * cleared when they're allocated, so we need to do it here. |
| 1569 | */ |
| 1570 | if (s->ctor) |
| 1571 | kmemcheck_mark_uninitialized_pages(page, pages); |
| 1572 | else |
| 1573 | kmemcheck_mark_unallocated_pages(page, pages); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1574 | } |
| 1575 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1576 | page->objects = oo_objects(oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1577 | |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1578 | order = compound_order(page); |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 1579 | page->slab_cache = s; |
Joonsoo Kim | c03f94c | 2012-05-18 00:47:47 +0900 | [diff] [blame] | 1580 | __SetPageSlab(page); |
Michal Hocko | 2f064f3 | 2015-08-21 14:11:51 -0700 | [diff] [blame] | 1581 | if (page_is_pfmemalloc(page)) |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 1582 | SetPageSlabPfmemalloc(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1583 | |
| 1584 | start = page_address(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1585 | |
| 1586 | if (unlikely(s->flags & SLAB_POISON)) |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1587 | memset(start, POISON_INUSE, PAGE_SIZE << order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1588 | |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 1589 | kasan_poison_slab(page); |
| 1590 | |
Thomas Garnier | 210e7a4 | 2016-07-26 15:21:59 -0700 | [diff] [blame] | 1591 | shuffle = shuffle_freelist(s, page); |
| 1592 | |
| 1593 | if (!shuffle) { |
| 1594 | for_each_object_idx(p, idx, s, start, page->objects) { |
| 1595 | setup_object(s, page, p); |
| 1596 | if (likely(idx < page->objects)) |
| 1597 | set_freepointer(s, p, p + s->size); |
| 1598 | else |
| 1599 | set_freepointer(s, p, NULL); |
| 1600 | } |
| 1601 | page->freelist = fixup_red_left(s, start); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1602 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1603 | |
Christoph Lameter | e6e82ea | 2011-08-09 16:12:24 -0500 | [diff] [blame] | 1604 | page->inuse = page->objects; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 1605 | page->frozen = 1; |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1606 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1607 | out: |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1608 | if (gfpflags_allow_blocking(flags)) |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1609 | local_irq_disable(); |
| 1610 | if (!page) |
| 1611 | return NULL; |
| 1612 | |
| 1613 | mod_zone_page_state(page_zone(page), |
| 1614 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1615 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
| 1616 | 1 << oo_order(oo)); |
| 1617 | |
| 1618 | inc_slabs_node(s, page_to_nid(page), page->objects); |
| 1619 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1620 | return page; |
| 1621 | } |
| 1622 | |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1623 | static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1624 | { |
| 1625 | if (unlikely(flags & GFP_SLAB_BUG_MASK)) { |
Michal Hocko | bacdcb3 | 2016-07-26 15:22:02 -0700 | [diff] [blame] | 1626 | gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK; |
Michal Hocko | 72baeef0c | 2016-07-26 15:22:05 -0700 | [diff] [blame] | 1627 | flags &= ~GFP_SLAB_BUG_MASK; |
| 1628 | pr_warn("Unexpected gfp: %#x (%pGg). Fixing up to gfp: %#x (%pGg). Fix your code!\n", |
| 1629 | invalid_mask, &invalid_mask, flags, &flags); |
Thomas Gleixner | 588f8ba | 2015-09-04 15:45:48 -0700 | [diff] [blame] | 1630 | } |
| 1631 | |
| 1632 | return allocate_slab(s, |
| 1633 | flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); |
| 1634 | } |
| 1635 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1636 | static void __free_slab(struct kmem_cache *s, struct page *page) |
| 1637 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1638 | int order = compound_order(page); |
| 1639 | int pages = 1 << order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1640 | |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 1641 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1642 | void *p; |
| 1643 | |
| 1644 | slab_pad_check(s, page); |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1645 | for_each_object(p, s, page_address(page), |
| 1646 | page->objects) |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1647 | check_object(s, page, p, SLUB_RED_INACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1648 | } |
| 1649 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1650 | kmemcheck_free_shadow(page, compound_order(page)); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1651 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1652 | mod_zone_page_state(page_zone(page), |
| 1653 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1654 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1655 | -pages); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1656 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 1657 | __ClearPageSlabPfmemalloc(page); |
Christoph Lameter | 49bd522 | 2008-04-14 18:52:18 +0300 | [diff] [blame] | 1658 | __ClearPageSlab(page); |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1659 | |
Mel Gorman | 22b751c | 2013-02-22 16:34:59 -0800 | [diff] [blame] | 1660 | page_mapcount_reset(page); |
Nick Piggin | 1eb5ac6 | 2009-05-05 19:13:44 +1000 | [diff] [blame] | 1661 | if (current->reclaim_state) |
| 1662 | current->reclaim_state->reclaimed_slab += pages; |
Vladimir Davydov | 27ee57c | 2016-03-17 14:17:35 -0700 | [diff] [blame] | 1663 | memcg_uncharge_slab(page, order, s); |
| 1664 | __free_pages(page, order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1665 | } |
| 1666 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1667 | #define need_reserve_slab_rcu \ |
| 1668 | (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)) |
| 1669 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1670 | static void rcu_free_slab(struct rcu_head *h) |
| 1671 | { |
| 1672 | struct page *page; |
| 1673 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1674 | if (need_reserve_slab_rcu) |
| 1675 | page = virt_to_head_page(h); |
| 1676 | else |
| 1677 | page = container_of((struct list_head *)h, struct page, lru); |
| 1678 | |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 1679 | __free_slab(page->slab_cache, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1680 | } |
| 1681 | |
| 1682 | static void free_slab(struct kmem_cache *s, struct page *page) |
| 1683 | { |
| 1684 | if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) { |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1685 | struct rcu_head *head; |
| 1686 | |
| 1687 | if (need_reserve_slab_rcu) { |
| 1688 | int order = compound_order(page); |
| 1689 | int offset = (PAGE_SIZE << order) - s->reserved; |
| 1690 | |
| 1691 | VM_BUG_ON(s->reserved != sizeof(*head)); |
| 1692 | head = page_address(page) + offset; |
| 1693 | } else { |
Kirill A. Shutemov | bc4f610 | 2015-11-06 16:29:44 -0800 | [diff] [blame] | 1694 | head = &page->rcu_head; |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1695 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1696 | |
| 1697 | call_rcu(head, rcu_free_slab); |
| 1698 | } else |
| 1699 | __free_slab(s, page); |
| 1700 | } |
| 1701 | |
| 1702 | static void discard_slab(struct kmem_cache *s, struct page *page) |
| 1703 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1704 | dec_slabs_node(s, page_to_nid(page), page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1705 | free_slab(s, page); |
| 1706 | } |
| 1707 | |
| 1708 | /* |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1709 | * Management of partially allocated slabs. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1710 | */ |
Steven Rostedt | 1e4dd94 | 2014-02-10 14:25:46 -0800 | [diff] [blame] | 1711 | static inline void |
| 1712 | __add_partial(struct kmem_cache_node *n, struct page *page, int tail) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1713 | { |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 1714 | n->nr_partial++; |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 1715 | if (tail == DEACTIVATE_TO_TAIL) |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1716 | list_add_tail(&page->lru, &n->partial); |
| 1717 | else |
| 1718 | list_add(&page->lru, &n->partial); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1719 | } |
| 1720 | |
Steven Rostedt | 1e4dd94 | 2014-02-10 14:25:46 -0800 | [diff] [blame] | 1721 | static inline void add_partial(struct kmem_cache_node *n, |
| 1722 | struct page *page, int tail) |
| 1723 | { |
| 1724 | lockdep_assert_held(&n->list_lock); |
| 1725 | __add_partial(n, page, tail); |
| 1726 | } |
| 1727 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1728 | static inline void remove_partial(struct kmem_cache_node *n, |
Christoph Lameter | 62e346a | 2010-09-28 08:10:28 -0500 | [diff] [blame] | 1729 | struct page *page) |
| 1730 | { |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 1731 | lockdep_assert_held(&n->list_lock); |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 1732 | list_del(&page->lru); |
| 1733 | n->nr_partial--; |
Christoph Lameter | 62e346a | 2010-09-28 08:10:28 -0500 | [diff] [blame] | 1734 | } |
| 1735 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1736 | /* |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1737 | * Remove slab from the partial list, freeze it and |
| 1738 | * return the pointer to the freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1739 | * |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1740 | * Returns a list of objects or NULL if it fails. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1741 | */ |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1742 | static inline void *acquire_slab(struct kmem_cache *s, |
Christoph Lameter | acd19fd | 2011-08-09 16:12:25 -0500 | [diff] [blame] | 1743 | struct kmem_cache_node *n, struct page *page, |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1744 | int mode, int *objects) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1745 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1746 | void *freelist; |
| 1747 | unsigned long counters; |
| 1748 | struct page new; |
| 1749 | |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 1750 | lockdep_assert_held(&n->list_lock); |
| 1751 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1752 | /* |
| 1753 | * Zap the freelist and set the frozen bit. |
| 1754 | * The old freelist is the list of objects for the |
| 1755 | * per cpu allocation list. |
| 1756 | */ |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1757 | freelist = page->freelist; |
| 1758 | counters = page->counters; |
| 1759 | new.counters = counters; |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1760 | *objects = new.objects - new.inuse; |
Pekka Enberg | 23910c5 | 2012-06-04 10:14:58 +0300 | [diff] [blame] | 1761 | if (mode) { |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1762 | new.inuse = page->objects; |
Pekka Enberg | 23910c5 | 2012-06-04 10:14:58 +0300 | [diff] [blame] | 1763 | new.freelist = NULL; |
| 1764 | } else { |
| 1765 | new.freelist = freelist; |
| 1766 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1767 | |
Dave Hansen | a0132ac | 2014-01-29 14:05:50 -0800 | [diff] [blame] | 1768 | VM_BUG_ON(new.frozen); |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1769 | new.frozen = 1; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1770 | |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1771 | if (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1772 | freelist, counters, |
Joonsoo Kim | 02d7633 | 2012-05-17 00:13:02 +0900 | [diff] [blame] | 1773 | new.freelist, new.counters, |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1774 | "acquire_slab")) |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1775 | return NULL; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1776 | |
| 1777 | remove_partial(n, page); |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1778 | WARN_ON(!freelist); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1779 | return freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1780 | } |
| 1781 | |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1782 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain); |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1783 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1784 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1785 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1786 | * Try to allocate a partial slab from a specific node. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1787 | */ |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1788 | static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, |
| 1789 | struct kmem_cache_cpu *c, gfp_t flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1790 | { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1791 | struct page *page, *page2; |
| 1792 | void *object = NULL; |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1793 | int available = 0; |
| 1794 | int objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1795 | |
| 1796 | /* |
| 1797 | * Racy check. If we mistakenly see no partial slabs then we |
| 1798 | * just allocate an empty slab. If we mistakenly try to get a |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1799 | * partial slab and there is none available then get_partials() |
| 1800 | * will return NULL. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1801 | */ |
| 1802 | if (!n || !n->nr_partial) |
| 1803 | return NULL; |
| 1804 | |
| 1805 | spin_lock(&n->list_lock); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1806 | list_for_each_entry_safe(page, page2, &n->partial, lru) { |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1807 | void *t; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1808 | |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1809 | if (!pfmemalloc_match(page, flags)) |
| 1810 | continue; |
| 1811 | |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1812 | t = acquire_slab(s, n, page, object == NULL, &objects); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1813 | if (!t) |
| 1814 | break; |
| 1815 | |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1816 | available += objects; |
Alex,Shi | 12d7963 | 2011-09-07 10:26:36 +0800 | [diff] [blame] | 1817 | if (!object) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1818 | c->page = page; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1819 | stat(s, ALLOC_FROM_PARTIAL); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1820 | object = t; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1821 | } else { |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1822 | put_cpu_partial(s, page, 0); |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 1823 | stat(s, CPU_PARTIAL_NODE); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1824 | } |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 1825 | if (!kmem_cache_has_cpu_partial(s) |
| 1826 | || available > s->cpu_partial / 2) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1827 | break; |
| 1828 | |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1829 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1830 | spin_unlock(&n->list_lock); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1831 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1832 | } |
| 1833 | |
| 1834 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1835 | * Get a page from somewhere. Search in increasing NUMA distances. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1836 | */ |
Joonsoo Kim | de3ec03 | 2012-01-27 00:12:23 -0800 | [diff] [blame] | 1837 | static void *get_any_partial(struct kmem_cache *s, gfp_t flags, |
Christoph Lameter | acd19fd | 2011-08-09 16:12:25 -0500 | [diff] [blame] | 1838 | struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1839 | { |
| 1840 | #ifdef CONFIG_NUMA |
| 1841 | struct zonelist *zonelist; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1842 | struct zoneref *z; |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1843 | struct zone *zone; |
| 1844 | enum zone_type high_zoneidx = gfp_zone(flags); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1845 | void *object; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1846 | unsigned int cpuset_mems_cookie; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1847 | |
| 1848 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1849 | * The defrag ratio allows a configuration of the tradeoffs between |
| 1850 | * inter node defragmentation and node local allocations. A lower |
| 1851 | * defrag_ratio increases the tendency to do local allocations |
| 1852 | * instead of attempting to obtain partial slabs from other nodes. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1853 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1854 | * If the defrag_ratio is set to 0 then kmalloc() always |
| 1855 | * returns node local objects. If the ratio is higher then kmalloc() |
| 1856 | * may return off node objects because partial slabs are obtained |
| 1857 | * from other nodes and filled up. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1858 | * |
Li Peng | 43efd3e | 2016-05-19 17:10:43 -0700 | [diff] [blame] | 1859 | * If /sys/kernel/slab/xx/remote_node_defrag_ratio is set to 100 |
| 1860 | * (which makes defrag_ratio = 1000) then every (well almost) |
| 1861 | * allocation will first attempt to defrag slab caches on other nodes. |
| 1862 | * This means scanning over all nodes to look for partial slabs which |
| 1863 | * may be expensive if we do it every time we are trying to find a slab |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1864 | * with available objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1865 | */ |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 1866 | if (!s->remote_node_defrag_ratio || |
| 1867 | get_cycles() % 1024 > s->remote_node_defrag_ratio) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1868 | return NULL; |
| 1869 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1870 | do { |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 1871 | cpuset_mems_cookie = read_mems_allowed_begin(); |
David Rientjes | 2a38961 | 2014-04-07 15:37:29 -0700 | [diff] [blame] | 1872 | zonelist = node_zonelist(mempolicy_slab_node(), flags); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1873 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
| 1874 | struct kmem_cache_node *n; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1875 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1876 | n = get_node(s, zone_to_nid(zone)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1877 | |
Vladimir Davydov | dee2f8a | 2014-12-12 16:58:28 -0800 | [diff] [blame] | 1878 | if (n && cpuset_zone_allowed(zone, flags) && |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1879 | n->nr_partial > s->min_partial) { |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1880 | object = get_partial_node(s, n, c, flags); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1881 | if (object) { |
| 1882 | /* |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 1883 | * Don't check read_mems_allowed_retry() |
| 1884 | * here - if mems_allowed was updated in |
| 1885 | * parallel, that was a harmless race |
| 1886 | * between allocation and the cpuset |
| 1887 | * update |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1888 | */ |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1889 | return object; |
| 1890 | } |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1891 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1892 | } |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 1893 | } while (read_mems_allowed_retry(cpuset_mems_cookie)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1894 | #endif |
| 1895 | return NULL; |
| 1896 | } |
| 1897 | |
| 1898 | /* |
| 1899 | * Get a partial page, lock it and return it. |
| 1900 | */ |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1901 | static void *get_partial(struct kmem_cache *s, gfp_t flags, int node, |
Christoph Lameter | acd19fd | 2011-08-09 16:12:25 -0500 | [diff] [blame] | 1902 | struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1903 | { |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1904 | void *object; |
Joonsoo Kim | a561ce0 | 2014-10-09 15:26:15 -0700 | [diff] [blame] | 1905 | int searchnode = node; |
| 1906 | |
| 1907 | if (node == NUMA_NO_NODE) |
| 1908 | searchnode = numa_mem_id(); |
| 1909 | else if (!node_present_pages(node)) |
| 1910 | searchnode = node_to_mem_node(node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1911 | |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1912 | object = get_partial_node(s, get_node(s, searchnode), c, flags); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1913 | if (object || node != NUMA_NO_NODE) |
| 1914 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1915 | |
Christoph Lameter | acd19fd | 2011-08-09 16:12:25 -0500 | [diff] [blame] | 1916 | return get_any_partial(s, flags, c); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1917 | } |
| 1918 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1919 | #ifdef CONFIG_PREEMPT |
| 1920 | /* |
| 1921 | * Calculate the next globally unique transaction for disambiguiation |
| 1922 | * during cmpxchg. The transactions start with the cpu number and are then |
| 1923 | * incremented by CONFIG_NR_CPUS. |
| 1924 | */ |
| 1925 | #define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS) |
| 1926 | #else |
| 1927 | /* |
| 1928 | * No preemption supported therefore also no need to check for |
| 1929 | * different cpus. |
| 1930 | */ |
| 1931 | #define TID_STEP 1 |
| 1932 | #endif |
| 1933 | |
| 1934 | static inline unsigned long next_tid(unsigned long tid) |
| 1935 | { |
| 1936 | return tid + TID_STEP; |
| 1937 | } |
| 1938 | |
| 1939 | static inline unsigned int tid_to_cpu(unsigned long tid) |
| 1940 | { |
| 1941 | return tid % TID_STEP; |
| 1942 | } |
| 1943 | |
| 1944 | static inline unsigned long tid_to_event(unsigned long tid) |
| 1945 | { |
| 1946 | return tid / TID_STEP; |
| 1947 | } |
| 1948 | |
| 1949 | static inline unsigned int init_tid(int cpu) |
| 1950 | { |
| 1951 | return cpu; |
| 1952 | } |
| 1953 | |
| 1954 | static inline void note_cmpxchg_failure(const char *n, |
| 1955 | const struct kmem_cache *s, unsigned long tid) |
| 1956 | { |
| 1957 | #ifdef SLUB_DEBUG_CMPXCHG |
| 1958 | unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid); |
| 1959 | |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 1960 | pr_info("%s %s: cmpxchg redo ", n, s->name); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1961 | |
| 1962 | #ifdef CONFIG_PREEMPT |
| 1963 | if (tid_to_cpu(tid) != tid_to_cpu(actual_tid)) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 1964 | pr_warn("due to cpu change %d -> %d\n", |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1965 | tid_to_cpu(tid), tid_to_cpu(actual_tid)); |
| 1966 | else |
| 1967 | #endif |
| 1968 | if (tid_to_event(tid) != tid_to_event(actual_tid)) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 1969 | pr_warn("due to cpu running other code. Event %ld->%ld\n", |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1970 | tid_to_event(tid), tid_to_event(actual_tid)); |
| 1971 | else |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 1972 | pr_warn("for unknown reason: actual=%lx was=%lx target=%lx\n", |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1973 | actual_tid, tid, next_tid(tid)); |
| 1974 | #endif |
Christoph Lameter | 4fdccdf | 2011-03-22 13:35:00 -0500 | [diff] [blame] | 1975 | stat(s, CMPXCHG_DOUBLE_CPU_FAIL); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1976 | } |
| 1977 | |
Fengguang Wu | 788e1aa | 2012-09-28 16:34:05 +0800 | [diff] [blame] | 1978 | static void init_kmem_cache_cpus(struct kmem_cache *s) |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1979 | { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1980 | int cpu; |
| 1981 | |
| 1982 | for_each_possible_cpu(cpu) |
| 1983 | per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1984 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1985 | |
| 1986 | /* |
| 1987 | * Remove the cpu slab |
| 1988 | */ |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 1989 | static void deactivate_slab(struct kmem_cache *s, struct page *page, |
| 1990 | void *freelist) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1991 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1992 | enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1993 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
| 1994 | int lock = 0; |
| 1995 | enum slab_modes l = M_NONE, m = M_NONE; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1996 | void *nextfree; |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 1997 | int tail = DEACTIVATE_TO_HEAD; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1998 | struct page new; |
| 1999 | struct page old; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 2000 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2001 | if (page->freelist) { |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2002 | stat(s, DEACTIVATE_REMOTE_FREES); |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 2003 | tail = DEACTIVATE_TO_TAIL; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2004 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2005 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2006 | /* |
| 2007 | * Stage one: Free all available per cpu objects back |
| 2008 | * to the page freelist while it is still frozen. Leave the |
| 2009 | * last one. |
| 2010 | * |
| 2011 | * There is no need to take the list->lock because the page |
| 2012 | * is still frozen. |
| 2013 | */ |
| 2014 | while (freelist && (nextfree = get_freepointer(s, freelist))) { |
| 2015 | void *prior; |
| 2016 | unsigned long counters; |
| 2017 | |
| 2018 | do { |
| 2019 | prior = page->freelist; |
| 2020 | counters = page->counters; |
| 2021 | set_freepointer(s, freelist, prior); |
| 2022 | new.counters = counters; |
| 2023 | new.inuse--; |
Dave Hansen | a0132ac | 2014-01-29 14:05:50 -0800 | [diff] [blame] | 2024 | VM_BUG_ON(!new.frozen); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2025 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 2026 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2027 | prior, counters, |
| 2028 | freelist, new.counters, |
| 2029 | "drain percpu freelist")); |
| 2030 | |
| 2031 | freelist = nextfree; |
| 2032 | } |
| 2033 | |
| 2034 | /* |
| 2035 | * Stage two: Ensure that the page is unfrozen while the |
| 2036 | * list presence reflects the actual number of objects |
| 2037 | * during unfreeze. |
| 2038 | * |
| 2039 | * We setup the list membership and then perform a cmpxchg |
| 2040 | * with the count. If there is a mismatch then the page |
| 2041 | * is not unfrozen but the page is on the wrong list. |
| 2042 | * |
| 2043 | * Then we restart the process which may have to remove |
| 2044 | * the page from the list that we just put it on again |
| 2045 | * because the number of objects in the slab may have |
| 2046 | * changed. |
| 2047 | */ |
| 2048 | redo: |
| 2049 | |
| 2050 | old.freelist = page->freelist; |
| 2051 | old.counters = page->counters; |
Dave Hansen | a0132ac | 2014-01-29 14:05:50 -0800 | [diff] [blame] | 2052 | VM_BUG_ON(!old.frozen); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2053 | |
| 2054 | /* Determine target state of the slab */ |
| 2055 | new.counters = old.counters; |
| 2056 | if (freelist) { |
| 2057 | new.inuse--; |
| 2058 | set_freepointer(s, freelist, old.freelist); |
| 2059 | new.freelist = freelist; |
| 2060 | } else |
| 2061 | new.freelist = old.freelist; |
| 2062 | |
| 2063 | new.frozen = 0; |
| 2064 | |
Joonsoo Kim | 8a5b20a | 2014-07-02 15:22:35 -0700 | [diff] [blame] | 2065 | if (!new.inuse && n->nr_partial >= s->min_partial) |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2066 | m = M_FREE; |
| 2067 | else if (new.freelist) { |
| 2068 | m = M_PARTIAL; |
| 2069 | if (!lock) { |
| 2070 | lock = 1; |
| 2071 | /* |
| 2072 | * Taking the spinlock removes the possiblity |
| 2073 | * that acquire_slab() will see a slab page that |
| 2074 | * is frozen |
| 2075 | */ |
| 2076 | spin_lock(&n->list_lock); |
| 2077 | } |
| 2078 | } else { |
| 2079 | m = M_FULL; |
| 2080 | if (kmem_cache_debug(s) && !lock) { |
| 2081 | lock = 1; |
| 2082 | /* |
| 2083 | * This also ensures that the scanning of full |
| 2084 | * slabs from diagnostic functions will not see |
| 2085 | * any frozen slabs. |
| 2086 | */ |
| 2087 | spin_lock(&n->list_lock); |
| 2088 | } |
| 2089 | } |
| 2090 | |
| 2091 | if (l != m) { |
| 2092 | |
| 2093 | if (l == M_PARTIAL) |
| 2094 | |
| 2095 | remove_partial(n, page); |
| 2096 | |
| 2097 | else if (l == M_FULL) |
| 2098 | |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 2099 | remove_full(s, n, page); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2100 | |
| 2101 | if (m == M_PARTIAL) { |
| 2102 | |
| 2103 | add_partial(n, page, tail); |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 2104 | stat(s, tail); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2105 | |
| 2106 | } else if (m == M_FULL) { |
| 2107 | |
| 2108 | stat(s, DEACTIVATE_FULL); |
| 2109 | add_full(s, n, page); |
| 2110 | |
| 2111 | } |
| 2112 | } |
| 2113 | |
| 2114 | l = m; |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 2115 | if (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2116 | old.freelist, old.counters, |
| 2117 | new.freelist, new.counters, |
| 2118 | "unfreezing slab")) |
| 2119 | goto redo; |
| 2120 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2121 | if (lock) |
| 2122 | spin_unlock(&n->list_lock); |
| 2123 | |
| 2124 | if (m == M_FREE) { |
| 2125 | stat(s, DEACTIVATE_EMPTY); |
| 2126 | discard_slab(s, page); |
| 2127 | stat(s, FREE_SLAB); |
| 2128 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2129 | } |
| 2130 | |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 2131 | /* |
| 2132 | * Unfreeze all the cpu partial slabs. |
| 2133 | * |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 2134 | * This function must be called with interrupts disabled |
| 2135 | * for the cpu using c (or some other guarantee must be there |
| 2136 | * to guarantee no concurrent accesses). |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 2137 | */ |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 2138 | static void unfreeze_partials(struct kmem_cache *s, |
| 2139 | struct kmem_cache_cpu *c) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2140 | { |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2141 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
Joonsoo Kim | 43d7786 | 2012-06-09 02:23:16 +0900 | [diff] [blame] | 2142 | struct kmem_cache_node *n = NULL, *n2 = NULL; |
Shaohua Li | 9ada193 | 2011-11-14 13:34:13 +0800 | [diff] [blame] | 2143 | struct page *page, *discard_page = NULL; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2144 | |
| 2145 | while ((page = c->partial)) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2146 | struct page new; |
| 2147 | struct page old; |
| 2148 | |
| 2149 | c->partial = page->next; |
Joonsoo Kim | 43d7786 | 2012-06-09 02:23:16 +0900 | [diff] [blame] | 2150 | |
| 2151 | n2 = get_node(s, page_to_nid(page)); |
| 2152 | if (n != n2) { |
| 2153 | if (n) |
| 2154 | spin_unlock(&n->list_lock); |
| 2155 | |
| 2156 | n = n2; |
| 2157 | spin_lock(&n->list_lock); |
| 2158 | } |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2159 | |
| 2160 | do { |
| 2161 | |
| 2162 | old.freelist = page->freelist; |
| 2163 | old.counters = page->counters; |
Dave Hansen | a0132ac | 2014-01-29 14:05:50 -0800 | [diff] [blame] | 2164 | VM_BUG_ON(!old.frozen); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2165 | |
| 2166 | new.counters = old.counters; |
| 2167 | new.freelist = old.freelist; |
| 2168 | |
| 2169 | new.frozen = 0; |
| 2170 | |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 2171 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2172 | old.freelist, old.counters, |
| 2173 | new.freelist, new.counters, |
| 2174 | "unfreezing slab")); |
| 2175 | |
Joonsoo Kim | 8a5b20a | 2014-07-02 15:22:35 -0700 | [diff] [blame] | 2176 | if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) { |
Shaohua Li | 9ada193 | 2011-11-14 13:34:13 +0800 | [diff] [blame] | 2177 | page->next = discard_page; |
| 2178 | discard_page = page; |
Joonsoo Kim | 43d7786 | 2012-06-09 02:23:16 +0900 | [diff] [blame] | 2179 | } else { |
| 2180 | add_partial(n, page, DEACTIVATE_TO_TAIL); |
| 2181 | stat(s, FREE_ADD_PARTIAL); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2182 | } |
| 2183 | } |
| 2184 | |
| 2185 | if (n) |
| 2186 | spin_unlock(&n->list_lock); |
Shaohua Li | 9ada193 | 2011-11-14 13:34:13 +0800 | [diff] [blame] | 2187 | |
| 2188 | while (discard_page) { |
| 2189 | page = discard_page; |
| 2190 | discard_page = discard_page->next; |
| 2191 | |
| 2192 | stat(s, DEACTIVATE_EMPTY); |
| 2193 | discard_slab(s, page); |
| 2194 | stat(s, FREE_SLAB); |
| 2195 | } |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2196 | #endif |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2197 | } |
| 2198 | |
| 2199 | /* |
| 2200 | * Put a page that was just frozen (in __slab_free) into a partial page |
| 2201 | * slot if available. This is done without interrupts disabled and without |
| 2202 | * preemption disabled. The cmpxchg is racy and may put the partial page |
| 2203 | * onto a random cpus partial slot. |
| 2204 | * |
| 2205 | * If we did not find a slot then simply move all the partials to the |
| 2206 | * per node partial list. |
| 2207 | */ |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 2208 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2209 | { |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2210 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2211 | struct page *oldpage; |
| 2212 | int pages; |
| 2213 | int pobjects; |
| 2214 | |
Vladimir Davydov | d6e0b7f | 2015-02-12 14:59:47 -0800 | [diff] [blame] | 2215 | preempt_disable(); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2216 | do { |
| 2217 | pages = 0; |
| 2218 | pobjects = 0; |
| 2219 | oldpage = this_cpu_read(s->cpu_slab->partial); |
| 2220 | |
| 2221 | if (oldpage) { |
| 2222 | pobjects = oldpage->pobjects; |
| 2223 | pages = oldpage->pages; |
| 2224 | if (drain && pobjects > s->cpu_partial) { |
| 2225 | unsigned long flags; |
| 2226 | /* |
| 2227 | * partial array is full. Move the existing |
| 2228 | * set to the per node partial list. |
| 2229 | */ |
| 2230 | local_irq_save(flags); |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 2231 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2232 | local_irq_restore(flags); |
Joonsoo Kim | e24fc41 | 2012-06-23 03:22:38 +0900 | [diff] [blame] | 2233 | oldpage = NULL; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2234 | pobjects = 0; |
| 2235 | pages = 0; |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 2236 | stat(s, CPU_PARTIAL_DRAIN); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2237 | } |
| 2238 | } |
| 2239 | |
| 2240 | pages++; |
| 2241 | pobjects += page->objects - page->inuse; |
| 2242 | |
| 2243 | page->pages = pages; |
| 2244 | page->pobjects = pobjects; |
| 2245 | page->next = oldpage; |
| 2246 | |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 2247 | } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) |
| 2248 | != oldpage); |
Vladimir Davydov | d6e0b7f | 2015-02-12 14:59:47 -0800 | [diff] [blame] | 2249 | if (unlikely(!s->cpu_partial)) { |
| 2250 | unsigned long flags; |
| 2251 | |
| 2252 | local_irq_save(flags); |
| 2253 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); |
| 2254 | local_irq_restore(flags); |
| 2255 | } |
| 2256 | preempt_enable(); |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2257 | #endif |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2258 | } |
| 2259 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2260 | static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2261 | { |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2262 | stat(s, CPUSLAB_FLUSH); |
Christoph Lameter | c17dda4 | 2012-05-09 10:09:57 -0500 | [diff] [blame] | 2263 | deactivate_slab(s, c->page, c->freelist); |
| 2264 | |
| 2265 | c->tid = next_tid(c->tid); |
| 2266 | c->page = NULL; |
| 2267 | c->freelist = NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2268 | } |
| 2269 | |
| 2270 | /* |
| 2271 | * Flush cpu slab. |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2272 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2273 | * Called from IPI handler with interrupts disabled. |
| 2274 | */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 2275 | static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2276 | { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2277 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2278 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2279 | if (likely(c)) { |
| 2280 | if (c->page) |
| 2281 | flush_slab(s, c); |
| 2282 | |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 2283 | unfreeze_partials(s, c); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2284 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2285 | } |
| 2286 | |
| 2287 | static void flush_cpu_slab(void *d) |
| 2288 | { |
| 2289 | struct kmem_cache *s = d; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2290 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2291 | __flush_cpu_slab(s, smp_processor_id()); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2292 | } |
| 2293 | |
Gilad Ben-Yossef | a8364d5 | 2012-03-28 14:42:44 -0700 | [diff] [blame] | 2294 | static bool has_cpu_slab(int cpu, void *info) |
| 2295 | { |
| 2296 | struct kmem_cache *s = info; |
| 2297 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
| 2298 | |
majianpeng | 02e1a9c | 2012-05-17 17:03:26 -0700 | [diff] [blame] | 2299 | return c->page || c->partial; |
Gilad Ben-Yossef | a8364d5 | 2012-03-28 14:42:44 -0700 | [diff] [blame] | 2300 | } |
| 2301 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2302 | static void flush_all(struct kmem_cache *s) |
| 2303 | { |
Gilad Ben-Yossef | a8364d5 | 2012-03-28 14:42:44 -0700 | [diff] [blame] | 2304 | on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2305 | } |
| 2306 | |
| 2307 | /* |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2308 | * Check if the objects in a per cpu structure fit numa |
| 2309 | * locality expectations. |
| 2310 | */ |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2311 | static inline int node_match(struct page *page, int node) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2312 | { |
| 2313 | #ifdef CONFIG_NUMA |
Christoph Lameter | 4d7868e | 2013-01-23 21:45:47 +0000 | [diff] [blame] | 2314 | if (!page || (node != NUMA_NO_NODE && page_to_nid(page) != node)) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2315 | return 0; |
| 2316 | #endif |
| 2317 | return 1; |
| 2318 | } |
| 2319 | |
David Rientjes | 9a02d69 | 2014-06-04 16:06:36 -0700 | [diff] [blame] | 2320 | #ifdef CONFIG_SLUB_DEBUG |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2321 | static int count_free(struct page *page) |
| 2322 | { |
| 2323 | return page->objects - page->inuse; |
| 2324 | } |
| 2325 | |
David Rientjes | 9a02d69 | 2014-06-04 16:06:36 -0700 | [diff] [blame] | 2326 | static inline unsigned long node_nr_objs(struct kmem_cache_node *n) |
| 2327 | { |
| 2328 | return atomic_long_read(&n->total_objects); |
| 2329 | } |
| 2330 | #endif /* CONFIG_SLUB_DEBUG */ |
| 2331 | |
| 2332 | #if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SYSFS) |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2333 | static unsigned long count_partial(struct kmem_cache_node *n, |
| 2334 | int (*get_count)(struct page *)) |
| 2335 | { |
| 2336 | unsigned long flags; |
| 2337 | unsigned long x = 0; |
| 2338 | struct page *page; |
| 2339 | |
| 2340 | spin_lock_irqsave(&n->list_lock, flags); |
| 2341 | list_for_each_entry(page, &n->partial, lru) |
| 2342 | x += get_count(page); |
| 2343 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 2344 | return x; |
| 2345 | } |
David Rientjes | 9a02d69 | 2014-06-04 16:06:36 -0700 | [diff] [blame] | 2346 | #endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */ |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 2347 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2348 | static noinline void |
| 2349 | slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid) |
| 2350 | { |
David Rientjes | 9a02d69 | 2014-06-04 16:06:36 -0700 | [diff] [blame] | 2351 | #ifdef CONFIG_SLUB_DEBUG |
| 2352 | static DEFINE_RATELIMIT_STATE(slub_oom_rs, DEFAULT_RATELIMIT_INTERVAL, |
| 2353 | DEFAULT_RATELIMIT_BURST); |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2354 | int node; |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 2355 | struct kmem_cache_node *n; |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2356 | |
David Rientjes | 9a02d69 | 2014-06-04 16:06:36 -0700 | [diff] [blame] | 2357 | if ((gfpflags & __GFP_NOWARN) || !__ratelimit(&slub_oom_rs)) |
| 2358 | return; |
| 2359 | |
Vlastimil Babka | 5b3810e | 2016-03-15 14:56:33 -0700 | [diff] [blame] | 2360 | pr_warn("SLUB: Unable to allocate memory on node %d, gfp=%#x(%pGg)\n", |
| 2361 | nid, gfpflags, &gfpflags); |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 2362 | pr_warn(" cache: %s, object size: %d, buffer size: %d, default order: %d, min order: %d\n", |
| 2363 | s->name, s->object_size, s->size, oo_order(s->oo), |
| 2364 | oo_order(s->min)); |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2365 | |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2366 | if (oo_order(s->min) > get_order(s->object_size)) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 2367 | pr_warn(" %s debugging increased min order, use slub_debug=O to disable.\n", |
| 2368 | s->name); |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 2369 | |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 2370 | for_each_kmem_cache_node(s, node, n) { |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2371 | unsigned long nr_slabs; |
| 2372 | unsigned long nr_objs; |
| 2373 | unsigned long nr_free; |
| 2374 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 2375 | nr_free = count_partial(n, count_free); |
| 2376 | nr_slabs = node_nr_slabs(n); |
| 2377 | nr_objs = node_nr_objs(n); |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2378 | |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 2379 | pr_warn(" node %d: slabs: %ld, objs: %ld, free: %ld\n", |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2380 | node, nr_slabs, nr_objs, nr_free); |
| 2381 | } |
David Rientjes | 9a02d69 | 2014-06-04 16:06:36 -0700 | [diff] [blame] | 2382 | #endif |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2383 | } |
| 2384 | |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2385 | static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags, |
| 2386 | int node, struct kmem_cache_cpu **pc) |
| 2387 | { |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2388 | void *freelist; |
Christoph Lameter | 188fd06 | 2012-05-09 10:09:55 -0500 | [diff] [blame] | 2389 | struct kmem_cache_cpu *c = *pc; |
| 2390 | struct page *page; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2391 | |
Christoph Lameter | 188fd06 | 2012-05-09 10:09:55 -0500 | [diff] [blame] | 2392 | freelist = get_partial(s, flags, node, c); |
| 2393 | |
| 2394 | if (freelist) |
| 2395 | return freelist; |
| 2396 | |
| 2397 | page = new_slab(s, flags, node); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2398 | if (page) { |
Christoph Lameter | 7c8e018 | 2014-06-04 16:07:56 -0700 | [diff] [blame] | 2399 | c = raw_cpu_ptr(s->cpu_slab); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2400 | if (c->page) |
| 2401 | flush_slab(s, c); |
| 2402 | |
| 2403 | /* |
| 2404 | * No other reference to the page yet so we can |
| 2405 | * muck around with it freely without cmpxchg |
| 2406 | */ |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2407 | freelist = page->freelist; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2408 | page->freelist = NULL; |
| 2409 | |
| 2410 | stat(s, ALLOC_SLAB); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2411 | c->page = page; |
| 2412 | *pc = c; |
| 2413 | } else |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2414 | freelist = NULL; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2415 | |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2416 | return freelist; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2417 | } |
| 2418 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 2419 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags) |
| 2420 | { |
| 2421 | if (unlikely(PageSlabPfmemalloc(page))) |
| 2422 | return gfp_pfmemalloc_allowed(gfpflags); |
| 2423 | |
| 2424 | return true; |
| 2425 | } |
| 2426 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2427 | /* |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 2428 | * Check the page->freelist of a page and either transfer the freelist to the |
| 2429 | * per cpu freelist or deactivate the page. |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2430 | * |
| 2431 | * The page is still frozen if the return value is not NULL. |
| 2432 | * |
| 2433 | * If this function returns NULL then the page has been unfrozen. |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 2434 | * |
| 2435 | * This function must be called with interrupt disabled. |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2436 | */ |
| 2437 | static inline void *get_freelist(struct kmem_cache *s, struct page *page) |
| 2438 | { |
| 2439 | struct page new; |
| 2440 | unsigned long counters; |
| 2441 | void *freelist; |
| 2442 | |
| 2443 | do { |
| 2444 | freelist = page->freelist; |
| 2445 | counters = page->counters; |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2446 | |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2447 | new.counters = counters; |
Dave Hansen | a0132ac | 2014-01-29 14:05:50 -0800 | [diff] [blame] | 2448 | VM_BUG_ON(!new.frozen); |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2449 | |
| 2450 | new.inuse = page->objects; |
| 2451 | new.frozen = freelist != NULL; |
| 2452 | |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 2453 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2454 | freelist, counters, |
| 2455 | NULL, new.counters, |
| 2456 | "get_freelist")); |
| 2457 | |
| 2458 | return freelist; |
| 2459 | } |
| 2460 | |
| 2461 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2462 | * Slow path. The lockless freelist is empty or we need to perform |
| 2463 | * debugging duties. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2464 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2465 | * Processing is still very fast if new objects have been freed to the |
| 2466 | * regular freelist. In that case we simply take over the regular freelist |
| 2467 | * as the lockless freelist and zap the regular freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2468 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2469 | * If that is not working then we fall back to the partial lists. We take the |
| 2470 | * first element of the freelist as the object to allocate now and move the |
| 2471 | * rest of the freelist to the lockless freelist. |
| 2472 | * |
| 2473 | * And if we were unable to get a new slab from the partial slab lists then |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2474 | * we need to allocate a new slab. This is the slowest path since it involves |
| 2475 | * a call to the page allocator and the setup of a new slab. |
Christoph Lameter | a380a3c | 2015-11-20 15:57:35 -0800 | [diff] [blame] | 2476 | * |
| 2477 | * Version of __slab_alloc to use when we know that interrupts are |
| 2478 | * already disabled (which is the case for bulk allocation). |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2479 | */ |
Christoph Lameter | a380a3c | 2015-11-20 15:57:35 -0800 | [diff] [blame] | 2480 | static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2481 | unsigned long addr, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2482 | { |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2483 | void *freelist; |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2484 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2485 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2486 | page = c->page; |
| 2487 | if (!page) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2488 | goto new_slab; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2489 | redo: |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2490 | |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2491 | if (unlikely(!node_match(page, node))) { |
Joonsoo Kim | a561ce0 | 2014-10-09 15:26:15 -0700 | [diff] [blame] | 2492 | int searchnode = node; |
| 2493 | |
| 2494 | if (node != NUMA_NO_NODE && !node_present_pages(node)) |
| 2495 | searchnode = node_to_mem_node(node); |
| 2496 | |
| 2497 | if (unlikely(!node_match(page, searchnode))) { |
| 2498 | stat(s, ALLOC_NODE_MISMATCH); |
| 2499 | deactivate_slab(s, page, c->freelist); |
| 2500 | c->page = NULL; |
| 2501 | c->freelist = NULL; |
| 2502 | goto new_slab; |
| 2503 | } |
Christoph Lameter | fc59c05 | 2011-06-01 12:25:56 -0500 | [diff] [blame] | 2504 | } |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2505 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 2506 | /* |
| 2507 | * By rights, we should be searching for a slab page that was |
| 2508 | * PFMEMALLOC but right now, we are losing the pfmemalloc |
| 2509 | * information when the page leaves the per-cpu allocator |
| 2510 | */ |
| 2511 | if (unlikely(!pfmemalloc_match(page, gfpflags))) { |
| 2512 | deactivate_slab(s, page, c->freelist); |
| 2513 | c->page = NULL; |
| 2514 | c->freelist = NULL; |
| 2515 | goto new_slab; |
| 2516 | } |
| 2517 | |
Eric Dumazet | 73736e0 | 2011-12-13 04:57:06 +0100 | [diff] [blame] | 2518 | /* must check again c->freelist in case of cpu migration or IRQ */ |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2519 | freelist = c->freelist; |
| 2520 | if (freelist) |
Eric Dumazet | 73736e0 | 2011-12-13 04:57:06 +0100 | [diff] [blame] | 2521 | goto load_freelist; |
| 2522 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2523 | freelist = get_freelist(s, page); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2524 | |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2525 | if (!freelist) { |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 2526 | c->page = NULL; |
| 2527 | stat(s, DEACTIVATE_BYPASS); |
Christoph Lameter | fc59c05 | 2011-06-01 12:25:56 -0500 | [diff] [blame] | 2528 | goto new_slab; |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 2529 | } |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2530 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2531 | stat(s, ALLOC_REFILL); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 2532 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2533 | load_freelist: |
Christoph Lameter | 507effe | 2012-05-09 10:09:52 -0500 | [diff] [blame] | 2534 | /* |
| 2535 | * freelist is pointing to the list of objects to be used. |
| 2536 | * page is pointing to the page from which the objects are obtained. |
| 2537 | * That page must be frozen for per cpu allocations to work. |
| 2538 | */ |
Dave Hansen | a0132ac | 2014-01-29 14:05:50 -0800 | [diff] [blame] | 2539 | VM_BUG_ON(!c->page->frozen); |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2540 | c->freelist = get_freepointer(s, freelist); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2541 | c->tid = next_tid(c->tid); |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2542 | return freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2543 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2544 | new_slab: |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2545 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2546 | if (c->partial) { |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2547 | page = c->page = c->partial; |
| 2548 | c->partial = page->next; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2549 | stat(s, CPU_PARTIAL_ALLOC); |
| 2550 | c->freelist = NULL; |
| 2551 | goto redo; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2552 | } |
| 2553 | |
Christoph Lameter | 188fd06 | 2012-05-09 10:09:55 -0500 | [diff] [blame] | 2554 | freelist = new_slab_objects(s, gfpflags, node, &c); |
Christoph Lameter | b811c20 | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 2555 | |
Christoph Lameter | f4697436 | 2012-05-09 10:09:54 -0500 | [diff] [blame] | 2556 | if (unlikely(!freelist)) { |
David Rientjes | 9a02d69 | 2014-06-04 16:06:36 -0700 | [diff] [blame] | 2557 | slab_out_of_memory(s, gfpflags, node); |
Christoph Lameter | f4697436 | 2012-05-09 10:09:54 -0500 | [diff] [blame] | 2558 | return NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2559 | } |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2560 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2561 | page = c->page; |
Christoph Lameter | 5091b74 | 2012-07-31 16:44:00 -0700 | [diff] [blame] | 2562 | if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2563 | goto load_freelist; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2564 | |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2565 | /* Only entered in the debug case */ |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 2566 | if (kmem_cache_debug(s) && |
| 2567 | !alloc_debug_processing(s, page, freelist, addr)) |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2568 | goto new_slab; /* Slab failed checks. Next slab needed */ |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2569 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2570 | deactivate_slab(s, page, get_freepointer(s, freelist)); |
Christoph Lameter | c17dda4 | 2012-05-09 10:09:57 -0500 | [diff] [blame] | 2571 | c->page = NULL; |
| 2572 | c->freelist = NULL; |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2573 | return freelist; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2574 | } |
| 2575 | |
| 2576 | /* |
Christoph Lameter | a380a3c | 2015-11-20 15:57:35 -0800 | [diff] [blame] | 2577 | * Another one that disabled interrupt and compensates for possible |
| 2578 | * cpu changes by refetching the per cpu area pointer. |
| 2579 | */ |
| 2580 | static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
| 2581 | unsigned long addr, struct kmem_cache_cpu *c) |
| 2582 | { |
| 2583 | void *p; |
| 2584 | unsigned long flags; |
| 2585 | |
| 2586 | local_irq_save(flags); |
| 2587 | #ifdef CONFIG_PREEMPT |
| 2588 | /* |
| 2589 | * We may have been preempted and rescheduled on a different |
| 2590 | * cpu before disabling interrupts. Need to reload cpu area |
| 2591 | * pointer. |
| 2592 | */ |
| 2593 | c = this_cpu_ptr(s->cpu_slab); |
| 2594 | #endif |
| 2595 | |
| 2596 | p = ___slab_alloc(s, gfpflags, node, addr, c); |
| 2597 | local_irq_restore(flags); |
| 2598 | return p; |
| 2599 | } |
| 2600 | |
| 2601 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2602 | * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc) |
| 2603 | * have the fastpath folded into their functions. So no function call |
| 2604 | * overhead for requests that can be satisfied on the fastpath. |
| 2605 | * |
| 2606 | * The fastpath works by first checking if the lockless freelist can be used. |
| 2607 | * If not then __slab_alloc is called for slow processing. |
| 2608 | * |
| 2609 | * Otherwise we can simply pick the next object from the lockless free list. |
| 2610 | */ |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2611 | static __always_inline void *slab_alloc_node(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2612 | gfp_t gfpflags, int node, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2613 | { |
Jesper Dangaard Brouer | 03ec0ed | 2015-11-20 15:57:52 -0800 | [diff] [blame] | 2614 | void *object; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2615 | struct kmem_cache_cpu *c; |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2616 | struct page *page; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2617 | unsigned long tid; |
Christoph Lameter | 1f84260 | 2008-01-07 23:20:30 -0800 | [diff] [blame] | 2618 | |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2619 | s = slab_pre_alloc_hook(s, gfpflags); |
| 2620 | if (!s) |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 2621 | return NULL; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2622 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2623 | /* |
| 2624 | * Must read kmem_cache cpu data via this cpu ptr. Preemption is |
| 2625 | * enabled. We may switch back and forth between cpus while |
| 2626 | * reading from one cpu area. That does not matter as long |
| 2627 | * as we end up on the original cpu again when doing the cmpxchg. |
Christoph Lameter | 7cccd80 | 2013-01-23 21:45:48 +0000 | [diff] [blame] | 2628 | * |
Joonsoo Kim | 9aabf81 | 2015-02-10 14:09:32 -0800 | [diff] [blame] | 2629 | * We should guarantee that tid and kmem_cache are retrieved on |
| 2630 | * the same cpu. It could be different if CONFIG_PREEMPT so we need |
| 2631 | * to check if it is matched or not. |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2632 | */ |
Joonsoo Kim | 9aabf81 | 2015-02-10 14:09:32 -0800 | [diff] [blame] | 2633 | do { |
| 2634 | tid = this_cpu_read(s->cpu_slab->tid); |
| 2635 | c = raw_cpu_ptr(s->cpu_slab); |
Mark Rutland | 859b7a0 | 2015-03-25 15:55:23 -0700 | [diff] [blame] | 2636 | } while (IS_ENABLED(CONFIG_PREEMPT) && |
| 2637 | unlikely(tid != READ_ONCE(c->tid))); |
Joonsoo Kim | 9aabf81 | 2015-02-10 14:09:32 -0800 | [diff] [blame] | 2638 | |
| 2639 | /* |
| 2640 | * Irqless object alloc/free algorithm used here depends on sequence |
| 2641 | * of fetching cpu_slab's data. tid should be fetched before anything |
| 2642 | * on c to guarantee that object and page associated with previous tid |
| 2643 | * won't be used with current tid. If we fetch tid first, object and |
| 2644 | * page could be one associated with next tid and our alloc/free |
| 2645 | * request will be failed. In this case, we will retry. So, no problem. |
| 2646 | */ |
| 2647 | barrier(); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2648 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2649 | /* |
| 2650 | * The transaction ids are globally unique per cpu and per operation on |
| 2651 | * a per cpu queue. Thus they can be guarantee that the cmpxchg_double |
| 2652 | * occurs on the right processor and that there was no operation on the |
| 2653 | * linked list in between. |
| 2654 | */ |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2655 | |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2656 | object = c->freelist; |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2657 | page = c->page; |
Dave Hansen | 8eae149 | 2014-06-04 16:06:37 -0700 | [diff] [blame] | 2658 | if (unlikely(!object || !node_match(page, node))) { |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2659 | object = __slab_alloc(s, gfpflags, node, addr, c); |
Dave Hansen | 8eae149 | 2014-06-04 16:06:37 -0700 | [diff] [blame] | 2660 | stat(s, ALLOC_SLOWPATH); |
| 2661 | } else { |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 2662 | void *next_object = get_freepointer_safe(s, object); |
| 2663 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2664 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2665 | * The cmpxchg will only match if there was no additional |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2666 | * operation and if we are on the right processor. |
| 2667 | * |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 2668 | * The cmpxchg does the following atomically (without lock |
| 2669 | * semantics!) |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2670 | * 1. Relocate first pointer to the current per cpu area. |
| 2671 | * 2. Verify that tid and freelist have not been changed |
| 2672 | * 3. If they were not changed replace tid and freelist |
| 2673 | * |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 2674 | * Since this is without lock semantics the protection is only |
| 2675 | * against code executing on this cpu *not* from access by |
| 2676 | * other cpus. |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2677 | */ |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 2678 | if (unlikely(!this_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2679 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2680 | object, tid, |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 2681 | next_object, next_tid(tid)))) { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2682 | |
| 2683 | note_cmpxchg_failure("slab_alloc", s, tid); |
| 2684 | goto redo; |
| 2685 | } |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 2686 | prefetch_freepointer(s, next_object); |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2687 | stat(s, ALLOC_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2688 | } |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2689 | |
Pekka Enberg | 74e2134 | 2009-11-25 20:14:48 +0200 | [diff] [blame] | 2690 | if (unlikely(gfpflags & __GFP_ZERO) && object) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2691 | memset(object, 0, s->object_size); |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 2692 | |
Jesper Dangaard Brouer | 03ec0ed | 2015-11-20 15:57:52 -0800 | [diff] [blame] | 2693 | slab_post_alloc_hook(s, gfpflags, 1, &object); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 2694 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2695 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2696 | } |
| 2697 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2698 | static __always_inline void *slab_alloc(struct kmem_cache *s, |
| 2699 | gfp_t gfpflags, unsigned long addr) |
| 2700 | { |
| 2701 | return slab_alloc_node(s, gfpflags, NUMA_NO_NODE, addr); |
| 2702 | } |
| 2703 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2704 | void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) |
| 2705 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2706 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2707 | |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 2708 | trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size, |
| 2709 | s->size, gfpflags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2710 | |
| 2711 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2712 | } |
| 2713 | EXPORT_SYMBOL(kmem_cache_alloc); |
| 2714 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2715 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2716 | void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2717 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2718 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2719 | trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); |
Alexander Potapenko | 505f5dc | 2016-03-25 14:22:02 -0700 | [diff] [blame] | 2720 | kasan_kmalloc(s, ret, size, gfpflags); |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2721 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2722 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2723 | EXPORT_SYMBOL(kmem_cache_alloc_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2724 | #endif |
| 2725 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2726 | #ifdef CONFIG_NUMA |
| 2727 | void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) |
| 2728 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2729 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2730 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2731 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2732 | s->object_size, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2733 | |
| 2734 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2735 | } |
| 2736 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2737 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2738 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2739 | void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2740 | gfp_t gfpflags, |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2741 | int node, size_t size) |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2742 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2743 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2744 | |
| 2745 | trace_kmalloc_node(_RET_IP_, ret, |
| 2746 | size, s->size, gfpflags, node); |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 2747 | |
Alexander Potapenko | 505f5dc | 2016-03-25 14:22:02 -0700 | [diff] [blame] | 2748 | kasan_kmalloc(s, ret, size, gfpflags); |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2749 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2750 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2751 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2752 | #endif |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 2753 | #endif |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2754 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2755 | /* |
Kim Phillips | 94e4d71 | 2015-02-10 14:09:37 -0800 | [diff] [blame] | 2756 | * Slow path handling. This may still be called frequently since objects |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2757 | * have a longer lifetime than the cpu slabs in most processing loads. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2758 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2759 | * So we still attempt to reduce cache line usage. Just take the slab |
| 2760 | * lock and free the item. If there is no additional partial page |
| 2761 | * handling required then we can return immediately. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2762 | */ |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2763 | static void __slab_free(struct kmem_cache *s, struct page *page, |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2764 | void *head, void *tail, int cnt, |
| 2765 | unsigned long addr) |
| 2766 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2767 | { |
| 2768 | void *prior; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2769 | int was_frozen; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2770 | struct page new; |
| 2771 | unsigned long counters; |
| 2772 | struct kmem_cache_node *n = NULL; |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 2773 | unsigned long uninitialized_var(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2774 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2775 | stat(s, FREE_SLOWPATH); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2776 | |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 2777 | if (kmem_cache_debug(s) && |
Laura Abbott | 282acb4 | 2016-03-15 14:54:59 -0700 | [diff] [blame] | 2778 | !free_debug_processing(s, page, head, tail, cnt, addr)) |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2779 | return; |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2780 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2781 | do { |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2782 | if (unlikely(n)) { |
| 2783 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 2784 | n = NULL; |
| 2785 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2786 | prior = page->freelist; |
| 2787 | counters = page->counters; |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2788 | set_freepointer(s, tail, prior); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2789 | new.counters = counters; |
| 2790 | was_frozen = new.frozen; |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2791 | new.inuse -= cnt; |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2792 | if ((!new.inuse || !prior) && !was_frozen) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2793 | |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 2794 | if (kmem_cache_has_cpu_partial(s) && !prior) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2795 | |
| 2796 | /* |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 2797 | * Slab was on no list before and will be |
| 2798 | * partially empty |
| 2799 | * We can defer the list move and instead |
| 2800 | * freeze it. |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2801 | */ |
| 2802 | new.frozen = 1; |
| 2803 | |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 2804 | } else { /* Needs to be taken off a list */ |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2805 | |
LQYMGT | b455def | 2014-12-10 15:42:13 -0800 | [diff] [blame] | 2806 | n = get_node(s, page_to_nid(page)); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2807 | /* |
| 2808 | * Speculatively acquire the list_lock. |
| 2809 | * If the cmpxchg does not succeed then we may |
| 2810 | * drop the list_lock without any processing. |
| 2811 | * |
| 2812 | * Otherwise the list_lock will synchronize with |
| 2813 | * other processors updating the list of slabs. |
| 2814 | */ |
| 2815 | spin_lock_irqsave(&n->list_lock, flags); |
| 2816 | |
| 2817 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2818 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2819 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2820 | } while (!cmpxchg_double_slab(s, page, |
| 2821 | prior, counters, |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2822 | head, new.counters, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2823 | "__slab_free")); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2824 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2825 | if (likely(!n)) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2826 | |
| 2827 | /* |
| 2828 | * If we just froze the page then put it onto the |
| 2829 | * per cpu partial list. |
| 2830 | */ |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 2831 | if (new.frozen && !was_frozen) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2832 | put_cpu_partial(s, page, 1); |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 2833 | stat(s, CPU_PARTIAL_FREE); |
| 2834 | } |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2835 | /* |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2836 | * The list lock was not taken therefore no list |
| 2837 | * activity can be necessary. |
| 2838 | */ |
LQYMGT | b455def | 2014-12-10 15:42:13 -0800 | [diff] [blame] | 2839 | if (was_frozen) |
| 2840 | stat(s, FREE_FROZEN); |
| 2841 | return; |
| 2842 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2843 | |
Joonsoo Kim | 8a5b20a | 2014-07-02 15:22:35 -0700 | [diff] [blame] | 2844 | if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2845 | goto slab_empty; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2846 | |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2847 | /* |
| 2848 | * Objects left in the slab. If it was not on the partial list before |
| 2849 | * then add it. |
| 2850 | */ |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2851 | if (!kmem_cache_has_cpu_partial(s) && unlikely(!prior)) { |
| 2852 | if (kmem_cache_debug(s)) |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 2853 | remove_full(s, n, page); |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2854 | add_partial(n, page, DEACTIVATE_TO_TAIL); |
| 2855 | stat(s, FREE_ADD_PARTIAL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2856 | } |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2857 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2858 | return; |
| 2859 | |
| 2860 | slab_empty: |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 2861 | if (prior) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2862 | /* |
Christoph Lameter | 6fbabb2 | 2011-08-08 11:16:56 -0500 | [diff] [blame] | 2863 | * Slab on the partial list. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2864 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2865 | remove_partial(n, page); |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2866 | stat(s, FREE_REMOVE_PARTIAL); |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 2867 | } else { |
Christoph Lameter | 6fbabb2 | 2011-08-08 11:16:56 -0500 | [diff] [blame] | 2868 | /* Slab must be on the full list */ |
Peter Zijlstra | c65c187 | 2014-01-10 13:23:49 +0100 | [diff] [blame] | 2869 | remove_full(s, n, page); |
| 2870 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2871 | |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2872 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2873 | stat(s, FREE_SLAB); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2874 | discard_slab(s, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2875 | } |
| 2876 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2877 | /* |
| 2878 | * Fastpath with forced inlining to produce a kfree and kmem_cache_free that |
| 2879 | * can perform fastpath freeing without additional function calls. |
| 2880 | * |
| 2881 | * The fastpath is only possible if we are freeing to the current cpu slab |
| 2882 | * of this processor. This typically the case if we have just allocated |
| 2883 | * the item before. |
| 2884 | * |
| 2885 | * If fastpath is not possible then fall back to __slab_free where we deal |
| 2886 | * with all sorts of special processing. |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2887 | * |
| 2888 | * Bulk free of a freelist with several objects (all pointing to the |
| 2889 | * same page) possible by specifying head and tail ptr, plus objects |
| 2890 | * count (cnt). Bulk free indicated by tail pointer being set. |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2891 | */ |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 2892 | static __always_inline void do_slab_free(struct kmem_cache *s, |
| 2893 | struct page *page, void *head, void *tail, |
| 2894 | int cnt, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2895 | { |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2896 | void *tail_obj = tail ? : head; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2897 | struct kmem_cache_cpu *c; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2898 | unsigned long tid; |
Christoph Lameter | a24c5a0 | 2011-03-15 12:45:21 -0500 | [diff] [blame] | 2899 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2900 | /* |
| 2901 | * Determine the currently cpus per cpu slab. |
| 2902 | * The cpu may change afterward. However that does not matter since |
| 2903 | * data is retrieved via this pointer. If we are on the same cpu |
Jesper Dangaard Brouer | 2ae4400 | 2015-09-04 15:45:31 -0700 | [diff] [blame] | 2904 | * during the cmpxchg then the free will succeed. |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2905 | */ |
Joonsoo Kim | 9aabf81 | 2015-02-10 14:09:32 -0800 | [diff] [blame] | 2906 | do { |
| 2907 | tid = this_cpu_read(s->cpu_slab->tid); |
| 2908 | c = raw_cpu_ptr(s->cpu_slab); |
Mark Rutland | 859b7a0 | 2015-03-25 15:55:23 -0700 | [diff] [blame] | 2909 | } while (IS_ENABLED(CONFIG_PREEMPT) && |
| 2910 | unlikely(tid != READ_ONCE(c->tid))); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2911 | |
Joonsoo Kim | 9aabf81 | 2015-02-10 14:09:32 -0800 | [diff] [blame] | 2912 | /* Same with comment on barrier() in slab_alloc_node() */ |
| 2913 | barrier(); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2914 | |
Christoph Lameter | 442b06b | 2011-05-17 16:29:31 -0500 | [diff] [blame] | 2915 | if (likely(page == c->page)) { |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2916 | set_freepointer(s, tail_obj, c->freelist); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2917 | |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 2918 | if (unlikely(!this_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2919 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2920 | c->freelist, tid, |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2921 | head, next_tid(tid)))) { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2922 | |
| 2923 | note_cmpxchg_failure("slab_free", s, tid); |
| 2924 | goto redo; |
| 2925 | } |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2926 | stat(s, FREE_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2927 | } else |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2928 | __slab_free(s, page, head, tail_obj, cnt, addr); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2929 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2930 | } |
| 2931 | |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 2932 | static __always_inline void slab_free(struct kmem_cache *s, struct page *page, |
| 2933 | void *head, void *tail, int cnt, |
| 2934 | unsigned long addr) |
| 2935 | { |
| 2936 | slab_free_freelist_hook(s, head, tail); |
| 2937 | /* |
| 2938 | * slab_free_freelist_hook() could have put the items into quarantine. |
| 2939 | * If so, no need to free them. |
| 2940 | */ |
| 2941 | if (s->flags & SLAB_KASAN && !(s->flags & SLAB_DESTROY_BY_RCU)) |
| 2942 | return; |
| 2943 | do_slab_free(s, page, head, tail, cnt, addr); |
| 2944 | } |
| 2945 | |
| 2946 | #ifdef CONFIG_KASAN |
| 2947 | void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr) |
| 2948 | { |
| 2949 | do_slab_free(cache, virt_to_head_page(x), x, NULL, 1, addr); |
| 2950 | } |
| 2951 | #endif |
| 2952 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2953 | void kmem_cache_free(struct kmem_cache *s, void *x) |
| 2954 | { |
Glauber Costa | b9ce5ef | 2012-12-18 14:22:46 -0800 | [diff] [blame] | 2955 | s = cache_from_obj(s, x); |
| 2956 | if (!s) |
Christoph Lameter | 7957610 | 2012-09-04 23:06:14 +0000 | [diff] [blame] | 2957 | return; |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 2958 | slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_); |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2959 | trace_kmem_cache_free(_RET_IP_, x); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2960 | } |
| 2961 | EXPORT_SYMBOL(kmem_cache_free); |
| 2962 | |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 2963 | struct detached_freelist { |
| 2964 | struct page *page; |
| 2965 | void *tail; |
| 2966 | void *freelist; |
| 2967 | int cnt; |
Jesper Dangaard Brouer | 376bf12 | 2016-03-15 14:53:32 -0700 | [diff] [blame] | 2968 | struct kmem_cache *s; |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 2969 | }; |
| 2970 | |
| 2971 | /* |
| 2972 | * This function progressively scans the array with free objects (with |
| 2973 | * a limited look ahead) and extract objects belonging to the same |
| 2974 | * page. It builds a detached freelist directly within the given |
| 2975 | * page/objects. This can happen without any need for |
| 2976 | * synchronization, because the objects are owned by running process. |
| 2977 | * The freelist is build up as a single linked list in the objects. |
| 2978 | * The idea is, that this detached freelist can then be bulk |
| 2979 | * transferred to the real freelist(s), but only requiring a single |
| 2980 | * synchronization primitive. Look ahead in the array is limited due |
| 2981 | * to performance reasons. |
| 2982 | */ |
Jesper Dangaard Brouer | 376bf12 | 2016-03-15 14:53:32 -0700 | [diff] [blame] | 2983 | static inline |
| 2984 | int build_detached_freelist(struct kmem_cache *s, size_t size, |
| 2985 | void **p, struct detached_freelist *df) |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 2986 | { |
| 2987 | size_t first_skipped_index = 0; |
| 2988 | int lookahead = 3; |
| 2989 | void *object; |
Jesper Dangaard Brouer | ca25719 | 2016-03-15 14:54:00 -0700 | [diff] [blame] | 2990 | struct page *page; |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 2991 | |
| 2992 | /* Always re-init detached_freelist */ |
| 2993 | df->page = NULL; |
| 2994 | |
| 2995 | do { |
| 2996 | object = p[--size]; |
Jesper Dangaard Brouer | ca25719 | 2016-03-15 14:54:00 -0700 | [diff] [blame] | 2997 | /* Do we need !ZERO_OR_NULL_PTR(object) here? (for kfree) */ |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 2998 | } while (!object && size); |
| 2999 | |
| 3000 | if (!object) |
| 3001 | return 0; |
| 3002 | |
Jesper Dangaard Brouer | ca25719 | 2016-03-15 14:54:00 -0700 | [diff] [blame] | 3003 | page = virt_to_head_page(object); |
| 3004 | if (!s) { |
| 3005 | /* Handle kalloc'ed objects */ |
| 3006 | if (unlikely(!PageSlab(page))) { |
| 3007 | BUG_ON(!PageCompound(page)); |
| 3008 | kfree_hook(object); |
Vladimir Davydov | 4949148 | 2016-07-26 15:24:24 -0700 | [diff] [blame] | 3009 | __free_pages(page, compound_order(page)); |
Jesper Dangaard Brouer | ca25719 | 2016-03-15 14:54:00 -0700 | [diff] [blame] | 3010 | p[size] = NULL; /* mark object processed */ |
| 3011 | return size; |
| 3012 | } |
| 3013 | /* Derive kmem_cache from object */ |
| 3014 | df->s = page->slab_cache; |
| 3015 | } else { |
| 3016 | df->s = cache_from_obj(s, object); /* Support for memcg */ |
| 3017 | } |
Jesper Dangaard Brouer | 376bf12 | 2016-03-15 14:53:32 -0700 | [diff] [blame] | 3018 | |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 3019 | /* Start new detached freelist */ |
Jesper Dangaard Brouer | ca25719 | 2016-03-15 14:54:00 -0700 | [diff] [blame] | 3020 | df->page = page; |
Jesper Dangaard Brouer | 376bf12 | 2016-03-15 14:53:32 -0700 | [diff] [blame] | 3021 | set_freepointer(df->s, object, NULL); |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 3022 | df->tail = object; |
| 3023 | df->freelist = object; |
| 3024 | p[size] = NULL; /* mark object processed */ |
| 3025 | df->cnt = 1; |
| 3026 | |
| 3027 | while (size) { |
| 3028 | object = p[--size]; |
| 3029 | if (!object) |
| 3030 | continue; /* Skip processed objects */ |
| 3031 | |
| 3032 | /* df->page is always set at this point */ |
| 3033 | if (df->page == virt_to_head_page(object)) { |
| 3034 | /* Opportunity build freelist */ |
Jesper Dangaard Brouer | 376bf12 | 2016-03-15 14:53:32 -0700 | [diff] [blame] | 3035 | set_freepointer(df->s, object, df->freelist); |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 3036 | df->freelist = object; |
| 3037 | df->cnt++; |
| 3038 | p[size] = NULL; /* mark object processed */ |
| 3039 | |
| 3040 | continue; |
| 3041 | } |
| 3042 | |
| 3043 | /* Limit look ahead search */ |
| 3044 | if (!--lookahead) |
| 3045 | break; |
| 3046 | |
| 3047 | if (!first_skipped_index) |
| 3048 | first_skipped_index = size + 1; |
| 3049 | } |
| 3050 | |
| 3051 | return first_skipped_index; |
| 3052 | } |
| 3053 | |
Jesper Dangaard Brouer | 994eb76 | 2015-09-04 15:45:37 -0700 | [diff] [blame] | 3054 | /* Note that interrupts must be enabled when calling this function. */ |
Jesper Dangaard Brouer | 376bf12 | 2016-03-15 14:53:32 -0700 | [diff] [blame] | 3055 | void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p) |
Christoph Lameter | 484748f | 2015-09-04 15:45:34 -0700 | [diff] [blame] | 3056 | { |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 3057 | if (WARN_ON(!size)) |
| 3058 | return; |
Jesper Dangaard Brouer | fbd0263 | 2015-09-04 15:45:43 -0700 | [diff] [blame] | 3059 | |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 3060 | do { |
| 3061 | struct detached_freelist df; |
Jesper Dangaard Brouer | fbd0263 | 2015-09-04 15:45:43 -0700 | [diff] [blame] | 3062 | |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 3063 | size = build_detached_freelist(s, size, p, &df); |
| 3064 | if (unlikely(!df.page)) |
| 3065 | continue; |
Jesper Dangaard Brouer | fbd0263 | 2015-09-04 15:45:43 -0700 | [diff] [blame] | 3066 | |
Jesper Dangaard Brouer | 376bf12 | 2016-03-15 14:53:32 -0700 | [diff] [blame] | 3067 | slab_free(df.s, df.page, df.freelist, df.tail, df.cnt,_RET_IP_); |
Jesper Dangaard Brouer | d0ecd89 | 2015-11-20 15:57:49 -0800 | [diff] [blame] | 3068 | } while (likely(size)); |
Christoph Lameter | 484748f | 2015-09-04 15:45:34 -0700 | [diff] [blame] | 3069 | } |
| 3070 | EXPORT_SYMBOL(kmem_cache_free_bulk); |
| 3071 | |
Jesper Dangaard Brouer | 994eb76 | 2015-09-04 15:45:37 -0700 | [diff] [blame] | 3072 | /* Note that interrupts must be enabled when calling this function. */ |
Jesper Dangaard Brouer | 865762a | 2015-11-20 15:57:58 -0800 | [diff] [blame] | 3073 | int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, |
| 3074 | void **p) |
Christoph Lameter | 484748f | 2015-09-04 15:45:34 -0700 | [diff] [blame] | 3075 | { |
Jesper Dangaard Brouer | 994eb76 | 2015-09-04 15:45:37 -0700 | [diff] [blame] | 3076 | struct kmem_cache_cpu *c; |
| 3077 | int i; |
| 3078 | |
Jesper Dangaard Brouer | 03ec0ed | 2015-11-20 15:57:52 -0800 | [diff] [blame] | 3079 | /* memcg and kmem_cache debug support */ |
| 3080 | s = slab_pre_alloc_hook(s, flags); |
| 3081 | if (unlikely(!s)) |
| 3082 | return false; |
Jesper Dangaard Brouer | 994eb76 | 2015-09-04 15:45:37 -0700 | [diff] [blame] | 3083 | /* |
| 3084 | * Drain objects in the per cpu slab, while disabling local |
| 3085 | * IRQs, which protects against PREEMPT and interrupts |
| 3086 | * handlers invoking normal fastpath. |
| 3087 | */ |
| 3088 | local_irq_disable(); |
| 3089 | c = this_cpu_ptr(s->cpu_slab); |
| 3090 | |
| 3091 | for (i = 0; i < size; i++) { |
| 3092 | void *object = c->freelist; |
| 3093 | |
Jesper Dangaard Brouer | ebe909e | 2015-09-04 15:45:40 -0700 | [diff] [blame] | 3094 | if (unlikely(!object)) { |
Jesper Dangaard Brouer | ebe909e | 2015-09-04 15:45:40 -0700 | [diff] [blame] | 3095 | /* |
| 3096 | * Invoking slow path likely have side-effect |
| 3097 | * of re-populating per CPU c->freelist |
| 3098 | */ |
Christoph Lameter | 8709837 | 2015-11-20 15:57:38 -0800 | [diff] [blame] | 3099 | p[i] = ___slab_alloc(s, flags, NUMA_NO_NODE, |
Jesper Dangaard Brouer | ebe909e | 2015-09-04 15:45:40 -0700 | [diff] [blame] | 3100 | _RET_IP_, c); |
Christoph Lameter | 8709837 | 2015-11-20 15:57:38 -0800 | [diff] [blame] | 3101 | if (unlikely(!p[i])) |
| 3102 | goto error; |
| 3103 | |
Jesper Dangaard Brouer | ebe909e | 2015-09-04 15:45:40 -0700 | [diff] [blame] | 3104 | c = this_cpu_ptr(s->cpu_slab); |
| 3105 | continue; /* goto for-loop */ |
| 3106 | } |
Jesper Dangaard Brouer | 994eb76 | 2015-09-04 15:45:37 -0700 | [diff] [blame] | 3107 | c->freelist = get_freepointer(s, object); |
| 3108 | p[i] = object; |
| 3109 | } |
| 3110 | c->tid = next_tid(c->tid); |
| 3111 | local_irq_enable(); |
| 3112 | |
| 3113 | /* Clear memory outside IRQ disabled fastpath loop */ |
| 3114 | if (unlikely(flags & __GFP_ZERO)) { |
| 3115 | int j; |
| 3116 | |
| 3117 | for (j = 0; j < i; j++) |
| 3118 | memset(p[j], 0, s->object_size); |
| 3119 | } |
| 3120 | |
Jesper Dangaard Brouer | 03ec0ed | 2015-11-20 15:57:52 -0800 | [diff] [blame] | 3121 | /* memcg and kmem_cache debug support */ |
| 3122 | slab_post_alloc_hook(s, flags, size, p); |
Jesper Dangaard Brouer | 865762a | 2015-11-20 15:57:58 -0800 | [diff] [blame] | 3123 | return i; |
Christoph Lameter | 8709837 | 2015-11-20 15:57:38 -0800 | [diff] [blame] | 3124 | error: |
Christoph Lameter | 8709837 | 2015-11-20 15:57:38 -0800 | [diff] [blame] | 3125 | local_irq_enable(); |
Jesper Dangaard Brouer | 03ec0ed | 2015-11-20 15:57:52 -0800 | [diff] [blame] | 3126 | slab_post_alloc_hook(s, flags, i, p); |
| 3127 | __kmem_cache_free_bulk(s, i, p); |
Jesper Dangaard Brouer | 865762a | 2015-11-20 15:57:58 -0800 | [diff] [blame] | 3128 | return 0; |
Christoph Lameter | 484748f | 2015-09-04 15:45:34 -0700 | [diff] [blame] | 3129 | } |
| 3130 | EXPORT_SYMBOL(kmem_cache_alloc_bulk); |
| 3131 | |
| 3132 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3133 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3134 | * Object placement in a slab is made very easy because we always start at |
| 3135 | * offset 0. If we tune the size of the object to the alignment then we can |
| 3136 | * get the required alignment by putting one properly sized object after |
| 3137 | * another. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3138 | * |
| 3139 | * Notice that the allocation order determines the sizes of the per cpu |
| 3140 | * caches. Each processor has always one slab available for allocations. |
| 3141 | * Increasing the allocation order reduces the number of times that slabs |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3142 | * must be moved on and off the partial lists and is therefore a factor in |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3143 | * locking overhead. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3144 | */ |
| 3145 | |
| 3146 | /* |
| 3147 | * Mininum / Maximum order of slab pages. This influences locking overhead |
| 3148 | * and slab fragmentation. A higher order reduces the number of partial slabs |
| 3149 | * and increases the number of allocations possible without having to |
| 3150 | * take the list_lock. |
| 3151 | */ |
| 3152 | static int slub_min_order; |
Christoph Lameter | 114e9e8 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3153 | static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3154 | static int slub_min_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3155 | |
| 3156 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3157 | * Calculate the order of allocation given an slab object size. |
| 3158 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3159 | * The order of allocation has significant impact on performance and other |
| 3160 | * system components. Generally order 0 allocations should be preferred since |
| 3161 | * order 0 does not cause fragmentation in the page allocator. Larger objects |
| 3162 | * be problematic to put into order 0 slabs because there may be too much |
Christoph Lameter | c124f5b | 2008-04-14 19:13:29 +0300 | [diff] [blame] | 3163 | * unused space left. We go to a higher order if more than 1/16th of the slab |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3164 | * would be wasted. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3165 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3166 | * In order to reach satisfactory performance we must ensure that a minimum |
| 3167 | * number of objects is in one slab. Otherwise we may generate too much |
| 3168 | * activity on the partial lists which requires taking the list_lock. This is |
| 3169 | * less a concern for large slabs though which are rarely used. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3170 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3171 | * slub_max_order specifies the order where we begin to stop considering the |
| 3172 | * number of objects in a slab as critical. If we reach slub_max_order then |
| 3173 | * we try to keep the page order as low as possible. So we accept more waste |
| 3174 | * of space in favor of a small page order. |
| 3175 | * |
| 3176 | * Higher order allocations also allow the placement of more objects in a |
| 3177 | * slab and thereby reduce object handling overhead. If the user has |
| 3178 | * requested a higher mininum order then we start with that one instead of |
| 3179 | * the smallest order which will fit the object. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3180 | */ |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3181 | static inline int slab_order(int size, int min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3182 | int max_order, int fract_leftover, int reserved) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3183 | { |
| 3184 | int order; |
| 3185 | int rem; |
Christoph Lameter | 6300ea7 | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 3186 | int min_order = slub_min_order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3187 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3188 | if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE) |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 3189 | return get_order(size * MAX_OBJS_PER_PAGE) - 1; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 3190 | |
Wei Yang | 9f83570 | 2015-11-05 18:45:51 -0800 | [diff] [blame] | 3191 | for (order = max(min_order, get_order(min_objects * size + reserved)); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3192 | order <= max_order; order++) { |
| 3193 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3194 | unsigned long slab_size = PAGE_SIZE << order; |
| 3195 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3196 | rem = (slab_size - reserved) % size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3197 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3198 | if (rem <= slab_size / fract_leftover) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3199 | break; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3200 | } |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3201 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3202 | return order; |
| 3203 | } |
| 3204 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3205 | static inline int calculate_order(int size, int reserved) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3206 | { |
| 3207 | int order; |
| 3208 | int min_objects; |
| 3209 | int fraction; |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 3210 | int max_objects; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3211 | |
| 3212 | /* |
| 3213 | * Attempt to find best configuration for a slab. This |
| 3214 | * works by first attempting to generate a layout with |
| 3215 | * the best configuration and backing off gradually. |
| 3216 | * |
Wei Yang | 422ff4d | 2015-11-05 18:45:46 -0800 | [diff] [blame] | 3217 | * First we increase the acceptable waste in a slab. Then |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3218 | * we reduce the minimum objects required in a slab. |
| 3219 | */ |
| 3220 | min_objects = slub_min_objects; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3221 | if (!min_objects) |
| 3222 | min_objects = 4 * (fls(nr_cpu_ids) + 1); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3223 | max_objects = order_objects(slub_max_order, size, reserved); |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 3224 | min_objects = min(min_objects, max_objects); |
| 3225 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3226 | while (min_objects > 1) { |
Christoph Lameter | c124f5b | 2008-04-14 19:13:29 +0300 | [diff] [blame] | 3227 | fraction = 16; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3228 | while (fraction >= 4) { |
| 3229 | order = slab_order(size, min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3230 | slub_max_order, fraction, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3231 | if (order <= slub_max_order) |
| 3232 | return order; |
| 3233 | fraction /= 2; |
| 3234 | } |
Amerigo Wang | 5086c389c | 2009-08-19 21:44:13 +0300 | [diff] [blame] | 3235 | min_objects--; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3236 | } |
| 3237 | |
| 3238 | /* |
| 3239 | * We were unable to place multiple objects in a slab. Now |
| 3240 | * lets see if we can place a single object there. |
| 3241 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3242 | order = slab_order(size, 1, slub_max_order, 1, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3243 | if (order <= slub_max_order) |
| 3244 | return order; |
| 3245 | |
| 3246 | /* |
| 3247 | * Doh this slab cannot be placed using slub_max_order. |
| 3248 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3249 | order = slab_order(size, 1, MAX_ORDER, 1, reserved); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 3250 | if (order < MAX_ORDER) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 3251 | return order; |
| 3252 | return -ENOSYS; |
| 3253 | } |
| 3254 | |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 3255 | static void |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 3256 | init_kmem_cache_node(struct kmem_cache_node *n) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3257 | { |
| 3258 | n->nr_partial = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3259 | spin_lock_init(&n->list_lock); |
| 3260 | INIT_LIST_HEAD(&n->partial); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 3261 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 3262 | atomic_long_set(&n->nr_slabs, 0); |
Salman Qazi | 02b71b7 | 2008-09-11 12:25:41 -0700 | [diff] [blame] | 3263 | atomic_long_set(&n->total_objects, 0); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 3264 | INIT_LIST_HEAD(&n->full); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 3265 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3266 | } |
| 3267 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3268 | static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 3269 | { |
Christoph Lameter | 6c182dc | 2010-08-20 12:37:14 -0500 | [diff] [blame] | 3270 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3271 | KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 3272 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 3273 | /* |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 3274 | * Must align to double word boundary for the double cmpxchg |
| 3275 | * instructions to work; see __pcpu_double_call_return_bool(). |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 3276 | */ |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 3277 | s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), |
| 3278 | 2 * sizeof(void *)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 3279 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 3280 | if (!s->cpu_slab) |
| 3281 | return 0; |
| 3282 | |
| 3283 | init_kmem_cache_cpus(s); |
| 3284 | |
| 3285 | return 1; |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 3286 | } |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 3287 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3288 | static struct kmem_cache *kmem_cache_node; |
| 3289 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3290 | /* |
| 3291 | * No kmalloc_node yet so do it by hand. We know that this is the first |
| 3292 | * slab on the node for this slabcache. There are no concurrent accesses |
| 3293 | * possible. |
| 3294 | * |
Zhi Yong Wu | 721ae22 | 2013-11-08 20:47:37 +0800 | [diff] [blame] | 3295 | * Note that this function only works on the kmem_cache_node |
| 3296 | * when allocating for the kmem_cache_node. This is used for bootstrapping |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 3297 | * memory on a fresh node that has no slab structures yet. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3298 | */ |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3299 | static void early_kmem_cache_node_alloc(int node) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3300 | { |
| 3301 | struct page *page; |
| 3302 | struct kmem_cache_node *n; |
| 3303 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3304 | BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3305 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3306 | page = new_slab(kmem_cache_node, GFP_NOWAIT, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3307 | |
| 3308 | BUG_ON(!page); |
Christoph Lameter | a2f92ee | 2007-08-22 14:01:57 -0700 | [diff] [blame] | 3309 | if (page_to_nid(page) != node) { |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 3310 | pr_err("SLUB: Unable to allocate memory from node %d\n", node); |
| 3311 | pr_err("SLUB: Allocating a useless per node structure in order to be able to continue\n"); |
Christoph Lameter | a2f92ee | 2007-08-22 14:01:57 -0700 | [diff] [blame] | 3312 | } |
| 3313 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3314 | n = page->freelist; |
| 3315 | BUG_ON(!n); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3316 | page->freelist = get_freepointer(kmem_cache_node, n); |
Christoph Lameter | e6e82ea | 2011-08-09 16:12:24 -0500 | [diff] [blame] | 3317 | page->inuse = 1; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 3318 | page->frozen = 0; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3319 | kmem_cache_node->node[node] = n; |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 3320 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 3321 | init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3322 | init_tracking(kmem_cache_node, n); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 3323 | #endif |
Alexander Potapenko | 505f5dc | 2016-03-25 14:22:02 -0700 | [diff] [blame] | 3324 | kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node), |
| 3325 | GFP_KERNEL); |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 3326 | init_kmem_cache_node(n); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3327 | inc_slabs_node(kmem_cache_node, node, page->objects); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3328 | |
Dave Hansen | 67b6c90 | 2014-01-24 07:20:23 -0800 | [diff] [blame] | 3329 | /* |
Steven Rostedt | 1e4dd94 | 2014-02-10 14:25:46 -0800 | [diff] [blame] | 3330 | * No locks need to be taken here as it has just been |
| 3331 | * initialized and there is no concurrent access. |
Dave Hansen | 67b6c90 | 2014-01-24 07:20:23 -0800 | [diff] [blame] | 3332 | */ |
Steven Rostedt | 1e4dd94 | 2014-02-10 14:25:46 -0800 | [diff] [blame] | 3333 | __add_partial(n, page, DEACTIVATE_TO_HEAD); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3334 | } |
| 3335 | |
| 3336 | static void free_kmem_cache_nodes(struct kmem_cache *s) |
| 3337 | { |
| 3338 | int node; |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 3339 | struct kmem_cache_node *n; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3340 | |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 3341 | for_each_kmem_cache_node(s, node, n) { |
| 3342 | kmem_cache_free(kmem_cache_node, n); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3343 | s->node[node] = NULL; |
| 3344 | } |
| 3345 | } |
| 3346 | |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3347 | void __kmem_cache_release(struct kmem_cache *s) |
| 3348 | { |
Thomas Garnier | 210e7a4 | 2016-07-26 15:21:59 -0700 | [diff] [blame] | 3349 | cache_random_seq_destroy(s); |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3350 | free_percpu(s->cpu_slab); |
| 3351 | free_kmem_cache_nodes(s); |
| 3352 | } |
| 3353 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3354 | static int init_kmem_cache_nodes(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3355 | { |
| 3356 | int node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3357 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3358 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3359 | struct kmem_cache_node *n; |
| 3360 | |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 3361 | if (slab_state == DOWN) { |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3362 | early_kmem_cache_node_alloc(node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 3363 | continue; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3364 | } |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3365 | n = kmem_cache_alloc_node(kmem_cache_node, |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3366 | GFP_KERNEL, node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 3367 | |
| 3368 | if (!n) { |
| 3369 | free_kmem_cache_nodes(s); |
| 3370 | return 0; |
| 3371 | } |
| 3372 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3373 | s->node[node] = n; |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 3374 | init_kmem_cache_node(n); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3375 | } |
| 3376 | return 1; |
| 3377 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3378 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 3379 | static void set_min_partial(struct kmem_cache *s, unsigned long min) |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 3380 | { |
| 3381 | if (min < MIN_PARTIAL) |
| 3382 | min = MIN_PARTIAL; |
| 3383 | else if (min > MAX_PARTIAL) |
| 3384 | min = MAX_PARTIAL; |
| 3385 | s->min_partial = min; |
| 3386 | } |
| 3387 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3388 | /* |
| 3389 | * calculate_sizes() determines the order and the distribution of data within |
| 3390 | * a slab object. |
| 3391 | */ |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3392 | static int calculate_sizes(struct kmem_cache *s, int forced_order) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3393 | { |
| 3394 | unsigned long flags = s->flags; |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 3395 | size_t size = s->object_size; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3396 | int order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3397 | |
| 3398 | /* |
Christoph Lameter | d8b42bf | 2008-02-15 23:45:25 -0800 | [diff] [blame] | 3399 | * Round up object size to the next word boundary. We can only |
| 3400 | * place the free pointer at word boundaries and this determines |
| 3401 | * the possible location of the free pointer. |
| 3402 | */ |
| 3403 | size = ALIGN(size, sizeof(void *)); |
| 3404 | |
| 3405 | #ifdef CONFIG_SLUB_DEBUG |
| 3406 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3407 | * Determine if we can poison the object itself. If the user of |
| 3408 | * the slab may touch the object after free or before allocation |
| 3409 | * then we should never poison the object itself. |
| 3410 | */ |
| 3411 | if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) && |
Christoph Lameter | c59def9 | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3412 | !s->ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3413 | s->flags |= __OBJECT_POISON; |
| 3414 | else |
| 3415 | s->flags &= ~__OBJECT_POISON; |
| 3416 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3417 | |
| 3418 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3419 | * If we are Redzoning then check if there is some space between the |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3420 | * end of the object and the free pointer. If not then add an |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3421 | * additional word to have some bytes to store Redzone information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3422 | */ |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 3423 | if ((flags & SLAB_RED_ZONE) && size == s->object_size) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3424 | size += sizeof(void *); |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 3425 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3426 | |
| 3427 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3428 | * With that we have determined the number of bytes in actual use |
| 3429 | * by the object. This is the potential offset to the free pointer. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3430 | */ |
| 3431 | s->inuse = size; |
| 3432 | |
| 3433 | if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) || |
Christoph Lameter | c59def9 | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3434 | s->ctor)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3435 | /* |
| 3436 | * Relocate free pointer after the object if it is not |
| 3437 | * permitted to overwrite the first word of the object on |
| 3438 | * kmem_cache_free. |
| 3439 | * |
| 3440 | * This is the case if we do RCU, have a constructor or |
| 3441 | * destructor or are poisoning the objects. |
| 3442 | */ |
| 3443 | s->offset = size; |
| 3444 | size += sizeof(void *); |
| 3445 | } |
| 3446 | |
Christoph Lameter | c12b3c6 | 2007-05-23 13:57:31 -0700 | [diff] [blame] | 3447 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3448 | if (flags & SLAB_STORE_USER) |
| 3449 | /* |
| 3450 | * Need to store information about allocs and frees after |
| 3451 | * the object. |
| 3452 | */ |
| 3453 | size += 2 * sizeof(struct track); |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 3454 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3455 | |
Alexander Potapenko | 80a9201 | 2016-07-28 15:49:07 -0700 | [diff] [blame] | 3456 | kasan_cache_create(s, &size, &s->flags); |
| 3457 | #ifdef CONFIG_SLUB_DEBUG |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 3458 | if (flags & SLAB_RED_ZONE) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3459 | /* |
| 3460 | * Add some empty padding so that we can catch |
| 3461 | * overwrites from earlier objects rather than let |
| 3462 | * tracking information or the free pointer be |
Frederik Schwarzer | 0211a9c | 2008-12-29 22:14:56 +0100 | [diff] [blame] | 3463 | * corrupted if a user writes before the start |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3464 | * of the object. |
| 3465 | */ |
| 3466 | size += sizeof(void *); |
Joonsoo Kim | d86bd1b | 2016-03-15 14:55:12 -0700 | [diff] [blame] | 3467 | |
| 3468 | s->red_left_pad = sizeof(void *); |
| 3469 | s->red_left_pad = ALIGN(s->red_left_pad, s->align); |
| 3470 | size += s->red_left_pad; |
| 3471 | } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 3472 | #endif |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3473 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3474 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3475 | * SLUB stores one object immediately after another beginning from |
| 3476 | * offset 0. In order to align the objects we have to simply size |
| 3477 | * each object to conform to the alignment. |
| 3478 | */ |
Christoph Lameter | 4590685 | 2012-11-28 16:23:16 +0000 | [diff] [blame] | 3479 | size = ALIGN(size, s->align); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3480 | s->size = size; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3481 | if (forced_order >= 0) |
| 3482 | order = forced_order; |
| 3483 | else |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3484 | order = calculate_order(size, s->reserved); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3485 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3486 | if (order < 0) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3487 | return 0; |
| 3488 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 3489 | s->allocflags = 0; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3490 | if (order) |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 3491 | s->allocflags |= __GFP_COMP; |
| 3492 | |
| 3493 | if (s->flags & SLAB_CACHE_DMA) |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3494 | s->allocflags |= GFP_DMA; |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 3495 | |
| 3496 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 3497 | s->allocflags |= __GFP_RECLAIMABLE; |
| 3498 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3499 | /* |
| 3500 | * Determine the number of objects per slab |
| 3501 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3502 | s->oo = oo_make(order, size, s->reserved); |
| 3503 | s->min = oo_make(get_order(size), size, s->reserved); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3504 | if (oo_objects(s->oo) > oo_objects(s->max)) |
| 3505 | s->max = s->oo; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3506 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3507 | return !!oo_objects(s->oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3508 | } |
| 3509 | |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3510 | static int kmem_cache_open(struct kmem_cache *s, unsigned long flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3511 | { |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3512 | s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3513 | s->reserved = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3514 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 3515 | if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU)) |
| 3516 | s->reserved = sizeof(struct rcu_head); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3517 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3518 | if (!calculate_sizes(s, -1)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3519 | goto error; |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 3520 | if (disable_higher_order_debug) { |
| 3521 | /* |
| 3522 | * Disable debugging flags that store metadata if the min slab |
| 3523 | * order increased. |
| 3524 | */ |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 3525 | if (get_order(s->size) > get_order(s->object_size)) { |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 3526 | s->flags &= ~DEBUG_METADATA_FLAGS; |
| 3527 | s->offset = 0; |
| 3528 | if (!calculate_sizes(s, -1)) |
| 3529 | goto error; |
| 3530 | } |
| 3531 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3532 | |
Heiko Carstens | 2565409 | 2012-01-12 17:17:33 -0800 | [diff] [blame] | 3533 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
| 3534 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) |
Laura Abbott | 149daaf | 2016-03-15 14:55:09 -0700 | [diff] [blame] | 3535 | if (system_has_cmpxchg_double() && (s->flags & SLAB_NO_CMPXCHG) == 0) |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 3536 | /* Enable fast mode */ |
| 3537 | s->flags |= __CMPXCHG_DOUBLE; |
| 3538 | #endif |
| 3539 | |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 3540 | /* |
| 3541 | * The larger the object size is, the more pages we want on the partial |
| 3542 | * list to avoid pounding the page allocator excessively. |
| 3543 | */ |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 3544 | set_min_partial(s, ilog2(s->size) / 2); |
| 3545 | |
| 3546 | /* |
| 3547 | * cpu_partial determined the maximum number of objects kept in the |
| 3548 | * per cpu partial lists of a processor. |
| 3549 | * |
| 3550 | * Per cpu partial lists mainly contain slabs that just have one |
| 3551 | * object freed. If they are used for allocation then they can be |
| 3552 | * filled up again with minimal effort. The slab will never hit the |
| 3553 | * per node partial lists and therefore no locking will be required. |
| 3554 | * |
| 3555 | * This setting also determines |
| 3556 | * |
| 3557 | * A) The number of objects from per cpu partial slabs dumped to the |
| 3558 | * per node list when we reach the limit. |
Alex Shi | 9f26490 | 2011-09-01 11:32:18 +0800 | [diff] [blame] | 3559 | * B) The number of objects in cpu partial slabs to extract from the |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 3560 | * per node list when we run out of per cpu objects. We only fetch |
| 3561 | * 50% to keep some capacity around for frees. |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 3562 | */ |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 3563 | if (!kmem_cache_has_cpu_partial(s)) |
Christoph Lameter | 8f1e33d | 2011-11-23 09:24:27 -0600 | [diff] [blame] | 3564 | s->cpu_partial = 0; |
| 3565 | else if (s->size >= PAGE_SIZE) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 3566 | s->cpu_partial = 2; |
| 3567 | else if (s->size >= 1024) |
| 3568 | s->cpu_partial = 6; |
| 3569 | else if (s->size >= 256) |
| 3570 | s->cpu_partial = 13; |
| 3571 | else |
| 3572 | s->cpu_partial = 30; |
| 3573 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3574 | #ifdef CONFIG_NUMA |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 3575 | s->remote_node_defrag_ratio = 1000; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3576 | #endif |
Thomas Garnier | 210e7a4 | 2016-07-26 15:21:59 -0700 | [diff] [blame] | 3577 | |
| 3578 | /* Initialize the pre-computed randomized freelist if slab is up */ |
| 3579 | if (slab_state >= UP) { |
| 3580 | if (init_cache_random_seq(s)) |
| 3581 | goto error; |
| 3582 | } |
| 3583 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3584 | if (!init_kmem_cache_nodes(s)) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 3585 | goto error; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3586 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3587 | if (alloc_kmem_cache_cpus(s)) |
Christoph Lameter | 278b1bb | 2012-09-05 00:20:34 +0000 | [diff] [blame] | 3588 | return 0; |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 3589 | |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 3590 | free_kmem_cache_nodes(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3591 | error: |
| 3592 | if (flags & SLAB_PANIC) |
Joe Perches | 756a025 | 2016-03-17 14:19:47 -0700 | [diff] [blame] | 3593 | panic("Cannot create slab %s size=%lu realsize=%u order=%u offset=%u flags=%lx\n", |
| 3594 | s->name, (unsigned long)s->size, s->size, |
| 3595 | oo_order(s->oo), s->offset, flags); |
Christoph Lameter | 278b1bb | 2012-09-05 00:20:34 +0000 | [diff] [blame] | 3596 | return -EINVAL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3597 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3598 | |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3599 | static void list_slab_objects(struct kmem_cache *s, struct page *page, |
| 3600 | const char *text) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3601 | { |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3602 | #ifdef CONFIG_SLUB_DEBUG |
| 3603 | void *addr = page_address(page); |
| 3604 | void *p; |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 3605 | unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) * |
| 3606 | sizeof(long), GFP_ATOMIC); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 3607 | if (!map) |
| 3608 | return; |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3609 | slab_err(s, page, text, s->name); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3610 | slab_lock(page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3611 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 3612 | get_map(s, page, map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3613 | for_each_object(p, s, addr, page->objects) { |
| 3614 | |
| 3615 | if (!test_bit(slab_index(p, s, addr), map)) { |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 3616 | pr_err("INFO: Object 0x%p @offset=%tu\n", p, p - addr); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3617 | print_tracking(s, p); |
| 3618 | } |
| 3619 | } |
| 3620 | slab_unlock(page); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 3621 | kfree(map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3622 | #endif |
| 3623 | } |
| 3624 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3625 | /* |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3626 | * Attempt to free all partial slabs on a node. |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3627 | * This is called from __kmem_cache_shutdown(). We must take list_lock |
| 3628 | * because sysfs file might still access partial list after the shutdowning. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3629 | */ |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3630 | static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3631 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3632 | struct page *page, *h; |
| 3633 | |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3634 | BUG_ON(irqs_disabled()); |
| 3635 | spin_lock_irq(&n->list_lock); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3636 | list_for_each_entry_safe(page, h, &n->partial, lru) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3637 | if (!page->inuse) { |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3638 | remove_partial(n, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3639 | discard_slab(s, page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3640 | } else { |
| 3641 | list_slab_objects(s, page, |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3642 | "Objects remaining in %s on __kmem_cache_shutdown()"); |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3643 | } |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3644 | } |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3645 | spin_unlock_irq(&n->list_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3646 | } |
| 3647 | |
| 3648 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3649 | * Release all resources used by a slab cache. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3650 | */ |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 3651 | int __kmem_cache_shutdown(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3652 | { |
| 3653 | int node; |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 3654 | struct kmem_cache_node *n; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3655 | |
| 3656 | flush_all(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3657 | /* Attempt to free all objects */ |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 3658 | for_each_kmem_cache_node(s, node, n) { |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3659 | free_partial(s, n); |
| 3660 | if (n->nr_partial || slabs_node(s, node)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3661 | return 1; |
| 3662 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3663 | return 0; |
| 3664 | } |
| 3665 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3666 | /******************************************************************** |
| 3667 | * Kmalloc subsystem |
| 3668 | *******************************************************************/ |
| 3669 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3670 | static int __init setup_slub_min_order(char *str) |
| 3671 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3672 | get_option(&str, &slub_min_order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3673 | |
| 3674 | return 1; |
| 3675 | } |
| 3676 | |
| 3677 | __setup("slub_min_order=", setup_slub_min_order); |
| 3678 | |
| 3679 | static int __init setup_slub_max_order(char *str) |
| 3680 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3681 | get_option(&str, &slub_max_order); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 3682 | slub_max_order = min(slub_max_order, MAX_ORDER - 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3683 | |
| 3684 | return 1; |
| 3685 | } |
| 3686 | |
| 3687 | __setup("slub_max_order=", setup_slub_max_order); |
| 3688 | |
| 3689 | static int __init setup_slub_min_objects(char *str) |
| 3690 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3691 | get_option(&str, &slub_min_objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3692 | |
| 3693 | return 1; |
| 3694 | } |
| 3695 | |
| 3696 | __setup("slub_min_objects=", setup_slub_min_objects); |
| 3697 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3698 | void *__kmalloc(size_t size, gfp_t flags) |
| 3699 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3700 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3701 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3702 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3703 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3704 | return kmalloc_large(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3705 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3706 | s = kmalloc_slab(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3707 | |
| 3708 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3709 | return s; |
| 3710 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 3711 | ret = slab_alloc(s, flags, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3712 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3713 | trace_kmalloc(_RET_IP_, ret, size, s->size, flags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3714 | |
Alexander Potapenko | 505f5dc | 2016-03-25 14:22:02 -0700 | [diff] [blame] | 3715 | kasan_kmalloc(s, ret, size, flags); |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 3716 | |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3717 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3718 | } |
| 3719 | EXPORT_SYMBOL(__kmalloc); |
| 3720 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3721 | #ifdef CONFIG_NUMA |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3722 | static void *kmalloc_large_node(size_t size, gfp_t flags, int node) |
| 3723 | { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 3724 | struct page *page; |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3725 | void *ptr = NULL; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3726 | |
Vladimir Davydov | 5238343 | 2014-06-04 16:06:39 -0700 | [diff] [blame] | 3727 | flags |= __GFP_COMP | __GFP_NOTRACK; |
Vladimir Davydov | 4949148 | 2016-07-26 15:24:24 -0700 | [diff] [blame] | 3728 | page = alloc_pages_node(node, flags, get_order(size)); |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3729 | if (page) |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3730 | ptr = page_address(page); |
| 3731 | |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 3732 | kmalloc_large_node_hook(ptr, size, flags); |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3733 | return ptr; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3734 | } |
| 3735 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3736 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| 3737 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3738 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3739 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3740 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3741 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3742 | ret = kmalloc_large_node(size, flags, node); |
| 3743 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3744 | trace_kmalloc_node(_RET_IP_, ret, |
| 3745 | size, PAGE_SIZE << get_order(size), |
| 3746 | flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3747 | |
| 3748 | return ret; |
| 3749 | } |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3750 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3751 | s = kmalloc_slab(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3752 | |
| 3753 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3754 | return s; |
| 3755 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 3756 | ret = slab_alloc_node(s, flags, node, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3757 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3758 | trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3759 | |
Alexander Potapenko | 505f5dc | 2016-03-25 14:22:02 -0700 | [diff] [blame] | 3760 | kasan_kmalloc(s, ret, size, flags); |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 3761 | |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3762 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3763 | } |
| 3764 | EXPORT_SYMBOL(__kmalloc_node); |
| 3765 | #endif |
| 3766 | |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 3767 | static size_t __ksize(const void *object) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3768 | { |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3769 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3770 | |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 3771 | if (unlikely(object == ZERO_SIZE_PTR)) |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3772 | return 0; |
| 3773 | |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3774 | page = virt_to_head_page(object); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3775 | |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3776 | if (unlikely(!PageSlab(page))) { |
| 3777 | WARN_ON(!PageCompound(page)); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3778 | return PAGE_SIZE << compound_order(page); |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3779 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3780 | |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 3781 | return slab_ksize(page->slab_cache); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3782 | } |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 3783 | |
| 3784 | size_t ksize(const void *object) |
| 3785 | { |
| 3786 | size_t size = __ksize(object); |
| 3787 | /* We assume that ksize callers could use whole allocated area, |
Alexander Potapenko | 4ebb31a4 | 2016-05-20 16:59:14 -0700 | [diff] [blame] | 3788 | * so we need to unpoison this area. |
| 3789 | */ |
| 3790 | kasan_unpoison_shadow(object, size); |
Andrey Ryabinin | 0316bec | 2015-02-13 14:39:42 -0800 | [diff] [blame] | 3791 | return size; |
| 3792 | } |
Kirill A. Shutemov | b1aabec | 2009-02-10 15:21:44 +0200 | [diff] [blame] | 3793 | EXPORT_SYMBOL(ksize); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3794 | |
| 3795 | void kfree(const void *x) |
| 3796 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3797 | struct page *page; |
Christoph Lameter | 5bb983b | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 3798 | void *object = (void *)x; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3799 | |
Pekka Enberg | 2121db7 | 2009-03-25 11:05:57 +0200 | [diff] [blame] | 3800 | trace_kfree(_RET_IP_, x); |
| 3801 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3802 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3803 | return; |
| 3804 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 3805 | page = virt_to_head_page(x); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3806 | if (unlikely(!PageSlab(page))) { |
Christoph Lameter | 0937502 | 2008-05-28 10:32:22 -0700 | [diff] [blame] | 3807 | BUG_ON(!PageCompound(page)); |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 3808 | kfree_hook(x); |
Vladimir Davydov | 4949148 | 2016-07-26 15:24:24 -0700 | [diff] [blame] | 3809 | __free_pages(page, compound_order(page)); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3810 | return; |
| 3811 | } |
Jesper Dangaard Brouer | 8108465 | 2015-11-20 15:57:46 -0800 | [diff] [blame] | 3812 | slab_free(page->slab_cache, page, object, NULL, 1, _RET_IP_); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3813 | } |
| 3814 | EXPORT_SYMBOL(kfree); |
| 3815 | |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3816 | #define SHRINK_PROMOTE_MAX 32 |
| 3817 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3818 | /* |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3819 | * kmem_cache_shrink discards empty slabs and promotes the slabs filled |
| 3820 | * up most to the head of the partial lists. New allocations will then |
| 3821 | * fill those up and thus they can be removed from the partial lists. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3822 | * |
| 3823 | * The slabs with the least items are placed last. This results in them |
| 3824 | * being allocated from last increasing the chance that the last objects |
| 3825 | * are freed in them. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3826 | */ |
Vladimir Davydov | d6e0b7f | 2015-02-12 14:59:47 -0800 | [diff] [blame] | 3827 | int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate) |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3828 | { |
| 3829 | int node; |
| 3830 | int i; |
| 3831 | struct kmem_cache_node *n; |
| 3832 | struct page *page; |
| 3833 | struct page *t; |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3834 | struct list_head discard; |
| 3835 | struct list_head promote[SHRINK_PROMOTE_MAX]; |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3836 | unsigned long flags; |
Vladimir Davydov | ce3712d | 2015-02-12 14:59:44 -0800 | [diff] [blame] | 3837 | int ret = 0; |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3838 | |
Vladimir Davydov | d6e0b7f | 2015-02-12 14:59:47 -0800 | [diff] [blame] | 3839 | if (deactivate) { |
| 3840 | /* |
| 3841 | * Disable empty slabs caching. Used to avoid pinning offline |
| 3842 | * memory cgroups by kmem pages that can be freed. |
| 3843 | */ |
| 3844 | s->cpu_partial = 0; |
| 3845 | s->min_partial = 0; |
| 3846 | |
| 3847 | /* |
| 3848 | * s->cpu_partial is checked locklessly (see put_cpu_partial), |
| 3849 | * so we have to make sure the change is visible. |
| 3850 | */ |
Vladimir Davydov | 81ae6d0 | 2016-05-19 17:10:34 -0700 | [diff] [blame] | 3851 | synchronize_sched(); |
Vladimir Davydov | d6e0b7f | 2015-02-12 14:59:47 -0800 | [diff] [blame] | 3852 | } |
| 3853 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3854 | flush_all(s); |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 3855 | for_each_kmem_cache_node(s, node, n) { |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3856 | INIT_LIST_HEAD(&discard); |
| 3857 | for (i = 0; i < SHRINK_PROMOTE_MAX; i++) |
| 3858 | INIT_LIST_HEAD(promote + i); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3859 | |
| 3860 | spin_lock_irqsave(&n->list_lock, flags); |
| 3861 | |
| 3862 | /* |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3863 | * Build lists of slabs to discard or promote. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3864 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3865 | * Note that concurrent frees may occur while we hold the |
| 3866 | * list_lock. page->inuse here is the upper limit. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3867 | */ |
| 3868 | list_for_each_entry_safe(page, t, &n->partial, lru) { |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3869 | int free = page->objects - page->inuse; |
| 3870 | |
| 3871 | /* Do not reread page->inuse */ |
| 3872 | barrier(); |
| 3873 | |
| 3874 | /* We do not keep full slabs on the list */ |
| 3875 | BUG_ON(free <= 0); |
| 3876 | |
| 3877 | if (free == page->objects) { |
| 3878 | list_move(&page->lru, &discard); |
Christoph Lameter | 69cb8e6 | 2011-08-09 16:12:22 -0500 | [diff] [blame] | 3879 | n->nr_partial--; |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3880 | } else if (free <= SHRINK_PROMOTE_MAX) |
| 3881 | list_move(&page->lru, promote + free - 1); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3882 | } |
| 3883 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3884 | /* |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3885 | * Promote the slabs filled up most to the head of the |
| 3886 | * partial list. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3887 | */ |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3888 | for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--) |
| 3889 | list_splice(promote + i, &n->partial); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3890 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3891 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 69cb8e6 | 2011-08-09 16:12:22 -0500 | [diff] [blame] | 3892 | |
| 3893 | /* Release empty slabs */ |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 3894 | list_for_each_entry_safe(page, t, &discard, lru) |
Christoph Lameter | 69cb8e6 | 2011-08-09 16:12:22 -0500 | [diff] [blame] | 3895 | discard_slab(s, page); |
Vladimir Davydov | ce3712d | 2015-02-12 14:59:44 -0800 | [diff] [blame] | 3896 | |
| 3897 | if (slabs_node(s, node)) |
| 3898 | ret = 1; |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3899 | } |
| 3900 | |
Vladimir Davydov | ce3712d | 2015-02-12 14:59:44 -0800 | [diff] [blame] | 3901 | return ret; |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3902 | } |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3903 | |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3904 | static int slab_mem_going_offline_callback(void *arg) |
| 3905 | { |
| 3906 | struct kmem_cache *s; |
| 3907 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3908 | mutex_lock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3909 | list_for_each_entry(s, &slab_caches, list) |
Vladimir Davydov | d6e0b7f | 2015-02-12 14:59:47 -0800 | [diff] [blame] | 3910 | __kmem_cache_shrink(s, false); |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3911 | mutex_unlock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3912 | |
| 3913 | return 0; |
| 3914 | } |
| 3915 | |
| 3916 | static void slab_mem_offline_callback(void *arg) |
| 3917 | { |
| 3918 | struct kmem_cache_node *n; |
| 3919 | struct kmem_cache *s; |
| 3920 | struct memory_notify *marg = arg; |
| 3921 | int offline_node; |
| 3922 | |
Lai Jiangshan | b9d5ab2 | 2012-12-11 16:01:05 -0800 | [diff] [blame] | 3923 | offline_node = marg->status_change_nid_normal; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3924 | |
| 3925 | /* |
| 3926 | * If the node still has available memory. we need kmem_cache_node |
| 3927 | * for it yet. |
| 3928 | */ |
| 3929 | if (offline_node < 0) |
| 3930 | return; |
| 3931 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3932 | mutex_lock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3933 | list_for_each_entry(s, &slab_caches, list) { |
| 3934 | n = get_node(s, offline_node); |
| 3935 | if (n) { |
| 3936 | /* |
| 3937 | * if n->nr_slabs > 0, slabs still exist on the node |
| 3938 | * that is going down. We were unable to free them, |
Adam Buchbinder | c9404c9 | 2009-12-18 15:40:42 -0500 | [diff] [blame] | 3939 | * and offline_pages() function shouldn't call this |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3940 | * callback. So, we must fail. |
| 3941 | */ |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 3942 | BUG_ON(slabs_node(s, offline_node)); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3943 | |
| 3944 | s->node[offline_node] = NULL; |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3945 | kmem_cache_free(kmem_cache_node, n); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3946 | } |
| 3947 | } |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3948 | mutex_unlock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3949 | } |
| 3950 | |
| 3951 | static int slab_mem_going_online_callback(void *arg) |
| 3952 | { |
| 3953 | struct kmem_cache_node *n; |
| 3954 | struct kmem_cache *s; |
| 3955 | struct memory_notify *marg = arg; |
Lai Jiangshan | b9d5ab2 | 2012-12-11 16:01:05 -0800 | [diff] [blame] | 3956 | int nid = marg->status_change_nid_normal; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3957 | int ret = 0; |
| 3958 | |
| 3959 | /* |
| 3960 | * If the node's memory is already available, then kmem_cache_node is |
| 3961 | * already created. Nothing to do. |
| 3962 | */ |
| 3963 | if (nid < 0) |
| 3964 | return 0; |
| 3965 | |
| 3966 | /* |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 3967 | * We are bringing a node online. No memory is available yet. We must |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3968 | * allocate a kmem_cache_node structure in order to bring the node |
| 3969 | * online. |
| 3970 | */ |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3971 | mutex_lock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3972 | list_for_each_entry(s, &slab_caches, list) { |
| 3973 | /* |
| 3974 | * XXX: kmem_cache_alloc_node will fallback to other nodes |
| 3975 | * since memory is not yet available from the node that |
| 3976 | * is brought up. |
| 3977 | */ |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3978 | n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3979 | if (!n) { |
| 3980 | ret = -ENOMEM; |
| 3981 | goto out; |
| 3982 | } |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 3983 | init_kmem_cache_node(n); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3984 | s->node[nid] = n; |
| 3985 | } |
| 3986 | out: |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3987 | mutex_unlock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3988 | return ret; |
| 3989 | } |
| 3990 | |
| 3991 | static int slab_memory_callback(struct notifier_block *self, |
| 3992 | unsigned long action, void *arg) |
| 3993 | { |
| 3994 | int ret = 0; |
| 3995 | |
| 3996 | switch (action) { |
| 3997 | case MEM_GOING_ONLINE: |
| 3998 | ret = slab_mem_going_online_callback(arg); |
| 3999 | break; |
| 4000 | case MEM_GOING_OFFLINE: |
| 4001 | ret = slab_mem_going_offline_callback(arg); |
| 4002 | break; |
| 4003 | case MEM_OFFLINE: |
| 4004 | case MEM_CANCEL_ONLINE: |
| 4005 | slab_mem_offline_callback(arg); |
| 4006 | break; |
| 4007 | case MEM_ONLINE: |
| 4008 | case MEM_CANCEL_OFFLINE: |
| 4009 | break; |
| 4010 | } |
KAMEZAWA Hiroyuki | dc19f9d | 2008-12-01 13:13:48 -0800 | [diff] [blame] | 4011 | if (ret) |
| 4012 | ret = notifier_from_errno(ret); |
| 4013 | else |
| 4014 | ret = NOTIFY_OK; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 4015 | return ret; |
| 4016 | } |
| 4017 | |
Andrew Morton | 3ac38fa | 2013-04-29 15:08:06 -0700 | [diff] [blame] | 4018 | static struct notifier_block slab_memory_callback_nb = { |
| 4019 | .notifier_call = slab_memory_callback, |
| 4020 | .priority = SLAB_CALLBACK_PRI, |
| 4021 | }; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 4022 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4023 | /******************************************************************** |
| 4024 | * Basic setup of slabs |
| 4025 | *******************************************************************/ |
| 4026 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4027 | /* |
| 4028 | * Used for early kmem_cache structures that were allocated using |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4029 | * the page allocator. Allocate them properly then fix up the pointers |
| 4030 | * that may be pointing to the wrong kmem_cache structure. |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4031 | */ |
| 4032 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4033 | static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache) |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4034 | { |
| 4035 | int node; |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4036 | struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4037 | struct kmem_cache_node *n; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4038 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4039 | memcpy(s, static_cache, kmem_cache->object_size); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4040 | |
Glauber Costa | 7d557b3 | 2013-02-22 20:20:00 +0400 | [diff] [blame] | 4041 | /* |
| 4042 | * This runs very early, and only the boot processor is supposed to be |
| 4043 | * up. Even if it weren't true, IRQs are not up so we couldn't fire |
| 4044 | * IPIs around. |
| 4045 | */ |
| 4046 | __flush_cpu_slab(s, smp_processor_id()); |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4047 | for_each_kmem_cache_node(s, node, n) { |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4048 | struct page *p; |
| 4049 | |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4050 | list_for_each_entry(p, &n->partial, lru) |
| 4051 | p->slab_cache = s; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4052 | |
Li Zefan | 607bf32 | 2011-04-12 15:22:26 +0800 | [diff] [blame] | 4053 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4054 | list_for_each_entry(p, &n->full, lru) |
| 4055 | p->slab_cache = s; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4056 | #endif |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4057 | } |
Vladimir Davydov | f7ce319 | 2015-02-12 14:59:20 -0800 | [diff] [blame] | 4058 | slab_init_memcg_params(s); |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4059 | list_add(&s->list, &slab_caches); |
| 4060 | return s; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4061 | } |
| 4062 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4063 | void __init kmem_cache_init(void) |
| 4064 | { |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4065 | static __initdata struct kmem_cache boot_kmem_cache, |
| 4066 | boot_kmem_cache_node; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4067 | |
Stanislaw Gruszka | fc8d862 | 2012-01-10 15:07:32 -0800 | [diff] [blame] | 4068 | if (debug_guardpage_minorder()) |
| 4069 | slub_max_order = 0; |
| 4070 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4071 | kmem_cache_node = &boot_kmem_cache_node; |
| 4072 | kmem_cache = &boot_kmem_cache; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4073 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4074 | create_boot_cache(kmem_cache_node, "kmem_cache_node", |
| 4075 | sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 4076 | |
Andrew Morton | 3ac38fa | 2013-04-29 15:08:06 -0700 | [diff] [blame] | 4077 | register_hotmemory_notifier(&slab_memory_callback_nb); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4078 | |
| 4079 | /* Able to allocate the per node structures */ |
| 4080 | slab_state = PARTIAL; |
| 4081 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4082 | create_boot_cache(kmem_cache, "kmem_cache", |
| 4083 | offsetof(struct kmem_cache, node) + |
| 4084 | nr_node_ids * sizeof(struct kmem_cache_node *), |
| 4085 | SLAB_HWCACHE_ALIGN); |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 4086 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4087 | kmem_cache = bootstrap(&boot_kmem_cache); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4088 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4089 | /* |
| 4090 | * Allocate kmem_cache_node properly from the kmem_cache slab. |
| 4091 | * kmem_cache_node is separately allocated so no need to |
| 4092 | * update any list pointers. |
| 4093 | */ |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4094 | kmem_cache_node = bootstrap(&boot_kmem_cache_node); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 4095 | |
| 4096 | /* Now we can use the kmem_cache to allocate kmalloc slabs */ |
Daniel Sanders | 34cc699 | 2015-06-24 16:55:57 -0700 | [diff] [blame] | 4097 | setup_kmalloc_cache_index_table(); |
Christoph Lameter | f97d5f6 | 2013-01-10 19:12:17 +0000 | [diff] [blame] | 4098 | create_kmalloc_caches(0); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4099 | |
Thomas Garnier | 210e7a4 | 2016-07-26 15:21:59 -0700 | [diff] [blame] | 4100 | /* Setup random freelists for each cache */ |
| 4101 | init_freelist_randomization(); |
| 4102 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4103 | #ifdef CONFIG_SMP |
| 4104 | register_cpu_notifier(&slab_notifier); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4105 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4106 | |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4107 | pr_info("SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d, CPUs=%d, Nodes=%d\n", |
Christoph Lameter | f97d5f6 | 2013-01-10 19:12:17 +0000 | [diff] [blame] | 4108 | cache_line_size(), |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4109 | slub_min_order, slub_max_order, slub_min_objects, |
| 4110 | nr_cpu_ids, nr_node_ids); |
| 4111 | } |
| 4112 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 4113 | void __init kmem_cache_init_late(void) |
| 4114 | { |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 4115 | } |
| 4116 | |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 4117 | struct kmem_cache * |
Vladimir Davydov | a44cb94 | 2014-04-07 15:39:23 -0700 | [diff] [blame] | 4118 | __kmem_cache_alias(const char *name, size_t size, size_t align, |
| 4119 | unsigned long flags, void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4120 | { |
Vladimir Davydov | 426589f | 2015-02-12 14:59:23 -0800 | [diff] [blame] | 4121 | struct kmem_cache *s, *c; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4122 | |
Vladimir Davydov | a44cb94 | 2014-04-07 15:39:23 -0700 | [diff] [blame] | 4123 | s = find_mergeable(size, align, flags, name, ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4124 | if (s) { |
| 4125 | s->refcount++; |
Vladimir Davydov | 84d0ddd | 2014-04-07 15:39:29 -0700 | [diff] [blame] | 4126 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4127 | /* |
| 4128 | * Adjust the object sizes so that we clear |
| 4129 | * the complete object on kzalloc. |
| 4130 | */ |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 4131 | s->object_size = max(s->object_size, (int)size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4132 | s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 4133 | |
Vladimir Davydov | 426589f | 2015-02-12 14:59:23 -0800 | [diff] [blame] | 4134 | for_each_memcg_cache(c, s) { |
Vladimir Davydov | 84d0ddd | 2014-04-07 15:39:29 -0700 | [diff] [blame] | 4135 | c->object_size = s->object_size; |
| 4136 | c->inuse = max_t(int, c->inuse, |
| 4137 | ALIGN(size, sizeof(void *))); |
| 4138 | } |
| 4139 | |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 4140 | if (sysfs_slab_alias(s, name)) { |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 4141 | s->refcount--; |
Christoph Lameter | cbb7969 | 2012-09-05 00:18:32 +0000 | [diff] [blame] | 4142 | s = NULL; |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 4143 | } |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 4144 | } |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 4145 | |
Christoph Lameter | cbb7969 | 2012-09-05 00:18:32 +0000 | [diff] [blame] | 4146 | return s; |
| 4147 | } |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 4148 | |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 4149 | int __kmem_cache_create(struct kmem_cache *s, unsigned long flags) |
Christoph Lameter | cbb7969 | 2012-09-05 00:18:32 +0000 | [diff] [blame] | 4150 | { |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 4151 | int err; |
Christoph Lameter | 20cea96 | 2012-07-06 15:25:13 -0500 | [diff] [blame] | 4152 | |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 4153 | err = kmem_cache_open(s, flags); |
| 4154 | if (err) |
| 4155 | return err; |
Christoph Lameter | 20cea96 | 2012-07-06 15:25:13 -0500 | [diff] [blame] | 4156 | |
Christoph Lameter | 45530c4 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 4157 | /* Mutex is not taken during early boot */ |
| 4158 | if (slab_state <= UP) |
| 4159 | return 0; |
| 4160 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 4161 | memcg_propagate_slab_attrs(s); |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 4162 | err = sysfs_slab_add(s); |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 4163 | if (err) |
Dmitry Safonov | 52b4b95 | 2016-02-17 13:11:37 -0800 | [diff] [blame] | 4164 | __kmem_cache_release(s); |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 4165 | |
| 4166 | return err; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4167 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4168 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4169 | #ifdef CONFIG_SMP |
Christoph Lameter | 27390bc | 2007-06-01 00:47:09 -0700 | [diff] [blame] | 4170 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 4171 | * Use the cpu notifier to insure that the cpu slabs are flushed when |
| 4172 | * necessary. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4173 | */ |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 4174 | static int slab_cpuup_callback(struct notifier_block *nfb, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4175 | unsigned long action, void *hcpu) |
| 4176 | { |
| 4177 | long cpu = (long)hcpu; |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 4178 | struct kmem_cache *s; |
| 4179 | unsigned long flags; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4180 | |
| 4181 | switch (action) { |
| 4182 | case CPU_UP_CANCELED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 4183 | case CPU_UP_CANCELED_FROZEN: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4184 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 4185 | case CPU_DEAD_FROZEN: |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 4186 | mutex_lock(&slab_mutex); |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 4187 | list_for_each_entry(s, &slab_caches, list) { |
| 4188 | local_irq_save(flags); |
| 4189 | __flush_cpu_slab(s, cpu); |
| 4190 | local_irq_restore(flags); |
| 4191 | } |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 4192 | mutex_unlock(&slab_mutex); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4193 | break; |
| 4194 | default: |
| 4195 | break; |
| 4196 | } |
| 4197 | return NOTIFY_OK; |
| 4198 | } |
| 4199 | |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 4200 | static struct notifier_block slab_notifier = { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 4201 | .notifier_call = slab_cpuup_callback |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 4202 | }; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4203 | |
| 4204 | #endif |
| 4205 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 4206 | void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4207 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 4208 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 4209 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 4210 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 4211 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 4212 | return kmalloc_large(size, gfpflags); |
| 4213 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 4214 | s = kmalloc_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4215 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 4216 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 4217 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4218 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 4219 | ret = slab_alloc(s, gfpflags, caller); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 4220 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4221 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 4222 | trace_kmalloc(caller, ret, size, s->size, gfpflags); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 4223 | |
| 4224 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4225 | } |
| 4226 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 4227 | #ifdef CONFIG_NUMA |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4228 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 4229 | int node, unsigned long caller) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4230 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 4231 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 4232 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 4233 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 4234 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
Xiaotian Feng | d3e14aa | 2010-04-08 17:26:44 +0800 | [diff] [blame] | 4235 | ret = kmalloc_large_node(size, gfpflags, node); |
| 4236 | |
| 4237 | trace_kmalloc_node(caller, ret, |
| 4238 | size, PAGE_SIZE << get_order(size), |
| 4239 | gfpflags, node); |
| 4240 | |
| 4241 | return ret; |
| 4242 | } |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 4243 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 4244 | s = kmalloc_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4245 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 4246 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 4247 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4248 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 4249 | ret = slab_alloc_node(s, gfpflags, node, caller); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 4250 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4251 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 4252 | trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 4253 | |
| 4254 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4255 | } |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 4256 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4257 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4258 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4259 | static int count_inuse(struct page *page) |
| 4260 | { |
| 4261 | return page->inuse; |
| 4262 | } |
| 4263 | |
| 4264 | static int count_total(struct page *page) |
| 4265 | { |
| 4266 | return page->objects; |
| 4267 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4268 | #endif |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4269 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4270 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4271 | static int validate_slab(struct kmem_cache *s, struct page *page, |
| 4272 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4273 | { |
| 4274 | void *p; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 4275 | void *addr = page_address(page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4276 | |
| 4277 | if (!check_slab(s, page) || |
| 4278 | !on_freelist(s, page, NULL)) |
| 4279 | return 0; |
| 4280 | |
| 4281 | /* Now we know that a valid freelist exists */ |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 4282 | bitmap_zero(map, page->objects); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4283 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 4284 | get_map(s, page, map); |
| 4285 | for_each_object(p, s, addr, page->objects) { |
| 4286 | if (test_bit(slab_index(p, s, addr), map)) |
| 4287 | if (!check_object(s, page, p, SLUB_RED_INACTIVE)) |
| 4288 | return 0; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4289 | } |
| 4290 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4291 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 4292 | if (!test_bit(slab_index(p, s, addr), map)) |
Tero Roponen | 37d5744 | 2010-12-01 20:04:20 +0200 | [diff] [blame] | 4293 | if (!check_object(s, page, p, SLUB_RED_ACTIVE)) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4294 | return 0; |
| 4295 | return 1; |
| 4296 | } |
| 4297 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4298 | static void validate_slab_slab(struct kmem_cache *s, struct page *page, |
| 4299 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4300 | { |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 4301 | slab_lock(page); |
| 4302 | validate_slab(s, page, map); |
| 4303 | slab_unlock(page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4304 | } |
| 4305 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4306 | static int validate_slab_node(struct kmem_cache *s, |
| 4307 | struct kmem_cache_node *n, unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4308 | { |
| 4309 | unsigned long count = 0; |
| 4310 | struct page *page; |
| 4311 | unsigned long flags; |
| 4312 | |
| 4313 | spin_lock_irqsave(&n->list_lock, flags); |
| 4314 | |
| 4315 | list_for_each_entry(page, &n->partial, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4316 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4317 | count++; |
| 4318 | } |
| 4319 | if (count != n->nr_partial) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4320 | pr_err("SLUB %s: %ld partial slabs counted but counter=%ld\n", |
| 4321 | s->name, count, n->nr_partial); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4322 | |
| 4323 | if (!(s->flags & SLAB_STORE_USER)) |
| 4324 | goto out; |
| 4325 | |
| 4326 | list_for_each_entry(page, &n->full, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4327 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4328 | count++; |
| 4329 | } |
| 4330 | if (count != atomic_long_read(&n->nr_slabs)) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4331 | pr_err("SLUB: %s %ld slabs counted but counter=%ld\n", |
| 4332 | s->name, count, atomic_long_read(&n->nr_slabs)); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4333 | |
| 4334 | out: |
| 4335 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 4336 | return count; |
| 4337 | } |
| 4338 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4339 | static long validate_slab_cache(struct kmem_cache *s) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4340 | { |
| 4341 | int node; |
| 4342 | unsigned long count = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4343 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4344 | sizeof(unsigned long), GFP_KERNEL); |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4345 | struct kmem_cache_node *n; |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4346 | |
| 4347 | if (!map) |
| 4348 | return -ENOMEM; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4349 | |
| 4350 | flush_all(s); |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4351 | for_each_kmem_cache_node(s, node, n) |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4352 | count += validate_slab_node(s, n, map); |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4353 | kfree(map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4354 | return count; |
| 4355 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4356 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 4357 | * Generate lists of code addresses where slabcache objects are allocated |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4358 | * and freed. |
| 4359 | */ |
| 4360 | |
| 4361 | struct location { |
| 4362 | unsigned long count; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 4363 | unsigned long addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4364 | long long sum_time; |
| 4365 | long min_time; |
| 4366 | long max_time; |
| 4367 | long min_pid; |
| 4368 | long max_pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4369 | DECLARE_BITMAP(cpus, NR_CPUS); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4370 | nodemask_t nodes; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4371 | }; |
| 4372 | |
| 4373 | struct loc_track { |
| 4374 | unsigned long max; |
| 4375 | unsigned long count; |
| 4376 | struct location *loc; |
| 4377 | }; |
| 4378 | |
| 4379 | static void free_loc_track(struct loc_track *t) |
| 4380 | { |
| 4381 | if (t->max) |
| 4382 | free_pages((unsigned long)t->loc, |
| 4383 | get_order(sizeof(struct location) * t->max)); |
| 4384 | } |
| 4385 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4386 | static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4387 | { |
| 4388 | struct location *l; |
| 4389 | int order; |
| 4390 | |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4391 | order = get_order(sizeof(struct location) * max); |
| 4392 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4393 | l = (void *)__get_free_pages(flags, order); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4394 | if (!l) |
| 4395 | return 0; |
| 4396 | |
| 4397 | if (t->count) { |
| 4398 | memcpy(l, t->loc, sizeof(struct location) * t->count); |
| 4399 | free_loc_track(t); |
| 4400 | } |
| 4401 | t->max = max; |
| 4402 | t->loc = l; |
| 4403 | return 1; |
| 4404 | } |
| 4405 | |
| 4406 | static int add_location(struct loc_track *t, struct kmem_cache *s, |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4407 | const struct track *track) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4408 | { |
| 4409 | long start, end, pos; |
| 4410 | struct location *l; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 4411 | unsigned long caddr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4412 | unsigned long age = jiffies - track->when; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4413 | |
| 4414 | start = -1; |
| 4415 | end = t->count; |
| 4416 | |
| 4417 | for ( ; ; ) { |
| 4418 | pos = start + (end - start + 1) / 2; |
| 4419 | |
| 4420 | /* |
| 4421 | * There is nothing at "end". If we end up there |
| 4422 | * we need to add something to before end. |
| 4423 | */ |
| 4424 | if (pos == end) |
| 4425 | break; |
| 4426 | |
| 4427 | caddr = t->loc[pos].addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4428 | if (track->addr == caddr) { |
| 4429 | |
| 4430 | l = &t->loc[pos]; |
| 4431 | l->count++; |
| 4432 | if (track->when) { |
| 4433 | l->sum_time += age; |
| 4434 | if (age < l->min_time) |
| 4435 | l->min_time = age; |
| 4436 | if (age > l->max_time) |
| 4437 | l->max_time = age; |
| 4438 | |
| 4439 | if (track->pid < l->min_pid) |
| 4440 | l->min_pid = track->pid; |
| 4441 | if (track->pid > l->max_pid) |
| 4442 | l->max_pid = track->pid; |
| 4443 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4444 | cpumask_set_cpu(track->cpu, |
| 4445 | to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4446 | } |
| 4447 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4448 | return 1; |
| 4449 | } |
| 4450 | |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4451 | if (track->addr < caddr) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4452 | end = pos; |
| 4453 | else |
| 4454 | start = pos; |
| 4455 | } |
| 4456 | |
| 4457 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 4458 | * Not found. Insert new tracking element. |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4459 | */ |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4460 | if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max, GFP_ATOMIC)) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4461 | return 0; |
| 4462 | |
| 4463 | l = t->loc + pos; |
| 4464 | if (pos < t->count) |
| 4465 | memmove(l + 1, l, |
| 4466 | (t->count - pos) * sizeof(struct location)); |
| 4467 | t->count++; |
| 4468 | l->count = 1; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4469 | l->addr = track->addr; |
| 4470 | l->sum_time = age; |
| 4471 | l->min_time = age; |
| 4472 | l->max_time = age; |
| 4473 | l->min_pid = track->pid; |
| 4474 | l->max_pid = track->pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4475 | cpumask_clear(to_cpumask(l->cpus)); |
| 4476 | cpumask_set_cpu(track->cpu, to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4477 | nodes_clear(l->nodes); |
| 4478 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4479 | return 1; |
| 4480 | } |
| 4481 | |
| 4482 | static void process_slab(struct loc_track *t, struct kmem_cache *s, |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4483 | struct page *page, enum track_item alloc, |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 4484 | unsigned long *map) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4485 | { |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 4486 | void *addr = page_address(page); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4487 | void *p; |
| 4488 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 4489 | bitmap_zero(map, page->objects); |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 4490 | get_map(s, page, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4491 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4492 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4493 | if (!test_bit(slab_index(p, s, addr), map)) |
| 4494 | add_location(t, s, get_track(s, p, alloc)); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4495 | } |
| 4496 | |
| 4497 | static int list_locations(struct kmem_cache *s, char *buf, |
| 4498 | enum track_item alloc) |
| 4499 | { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4500 | int len = 0; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4501 | unsigned long i; |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4502 | struct loc_track t = { 0, 0, NULL }; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4503 | int node; |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4504 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
| 4505 | sizeof(unsigned long), GFP_KERNEL); |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4506 | struct kmem_cache_node *n; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4507 | |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4508 | if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location), |
| 4509 | GFP_TEMPORARY)) { |
| 4510 | kfree(map); |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4511 | return sprintf(buf, "Out of memory\n"); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4512 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4513 | /* Push back cpu slabs */ |
| 4514 | flush_all(s); |
| 4515 | |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4516 | for_each_kmem_cache_node(s, node, n) { |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4517 | unsigned long flags; |
| 4518 | struct page *page; |
| 4519 | |
Christoph Lameter | 9e86943 | 2007-08-22 14:01:56 -0700 | [diff] [blame] | 4520 | if (!atomic_long_read(&n->nr_slabs)) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4521 | continue; |
| 4522 | |
| 4523 | spin_lock_irqsave(&n->list_lock, flags); |
| 4524 | list_for_each_entry(page, &n->partial, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4525 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4526 | list_for_each_entry(page, &n->full, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4527 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4528 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 4529 | } |
| 4530 | |
| 4531 | for (i = 0; i < t.count; i++) { |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4532 | struct location *l = &t.loc[i]; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4533 | |
Hugh Dickins | 9c24624 | 2008-12-09 13:14:27 -0800 | [diff] [blame] | 4534 | if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4535 | break; |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4536 | len += sprintf(buf + len, "%7ld ", l->count); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4537 | |
| 4538 | if (l->addr) |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4539 | len += sprintf(buf + len, "%pS", (void *)l->addr); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4540 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4541 | len += sprintf(buf + len, "<not-available>"); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4542 | |
| 4543 | if (l->sum_time != l->min_time) { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4544 | len += sprintf(buf + len, " age=%ld/%ld/%ld", |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 4545 | l->min_time, |
| 4546 | (long)div_u64(l->sum_time, l->count), |
| 4547 | l->max_time); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4548 | } else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4549 | len += sprintf(buf + len, " age=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4550 | l->min_time); |
| 4551 | |
| 4552 | if (l->min_pid != l->max_pid) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4553 | len += sprintf(buf + len, " pid=%ld-%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4554 | l->min_pid, l->max_pid); |
| 4555 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4556 | len += sprintf(buf + len, " pid=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4557 | l->min_pid); |
| 4558 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4559 | if (num_online_cpus() > 1 && |
| 4560 | !cpumask_empty(to_cpumask(l->cpus)) && |
Tejun Heo | 5024c1d | 2015-02-13 14:37:59 -0800 | [diff] [blame] | 4561 | len < PAGE_SIZE - 60) |
| 4562 | len += scnprintf(buf + len, PAGE_SIZE - len - 50, |
| 4563 | " cpus=%*pbl", |
| 4564 | cpumask_pr_args(to_cpumask(l->cpus))); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4565 | |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 4566 | if (nr_online_nodes > 1 && !nodes_empty(l->nodes) && |
Tejun Heo | 5024c1d | 2015-02-13 14:37:59 -0800 | [diff] [blame] | 4567 | len < PAGE_SIZE - 60) |
| 4568 | len += scnprintf(buf + len, PAGE_SIZE - len - 50, |
| 4569 | " nodes=%*pbl", |
| 4570 | nodemask_pr_args(&l->nodes)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4571 | |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4572 | len += sprintf(buf + len, "\n"); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4573 | } |
| 4574 | |
| 4575 | free_loc_track(&t); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4576 | kfree(map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4577 | if (!t.count) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4578 | len += sprintf(buf, "No data\n"); |
| 4579 | return len; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4580 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4581 | #endif |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4582 | |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4583 | #ifdef SLUB_RESILIENCY_TEST |
David Rientjes | c07b818 | 2014-08-06 16:04:16 -0700 | [diff] [blame] | 4584 | static void __init resiliency_test(void) |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4585 | { |
| 4586 | u8 *p; |
| 4587 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 4588 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || KMALLOC_SHIFT_HIGH < 10); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4589 | |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4590 | pr_err("SLUB resiliency testing\n"); |
| 4591 | pr_err("-----------------------\n"); |
| 4592 | pr_err("A. Corruption after allocation\n"); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4593 | |
| 4594 | p = kzalloc(16, GFP_KERNEL); |
| 4595 | p[16] = 0x12; |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4596 | pr_err("\n1. kmalloc-16: Clobber Redzone/next pointer 0x12->0x%p\n\n", |
| 4597 | p + 16); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4598 | |
| 4599 | validate_slab_cache(kmalloc_caches[4]); |
| 4600 | |
| 4601 | /* Hmmm... The next two are dangerous */ |
| 4602 | p = kzalloc(32, GFP_KERNEL); |
| 4603 | p[32 + sizeof(void *)] = 0x34; |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4604 | pr_err("\n2. kmalloc-32: Clobber next pointer/next slab 0x34 -> -0x%p\n", |
| 4605 | p); |
| 4606 | pr_err("If allocated object is overwritten then not detectable\n\n"); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4607 | |
| 4608 | validate_slab_cache(kmalloc_caches[5]); |
| 4609 | p = kzalloc(64, GFP_KERNEL); |
| 4610 | p += 64 + (get_cycles() & 0xff) * sizeof(void *); |
| 4611 | *p = 0x56; |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4612 | pr_err("\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n", |
| 4613 | p); |
| 4614 | pr_err("If allocated object is overwritten then not detectable\n\n"); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4615 | validate_slab_cache(kmalloc_caches[6]); |
| 4616 | |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4617 | pr_err("\nB. Corruption after free\n"); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4618 | p = kzalloc(128, GFP_KERNEL); |
| 4619 | kfree(p); |
| 4620 | *p = 0x78; |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4621 | pr_err("1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4622 | validate_slab_cache(kmalloc_caches[7]); |
| 4623 | |
| 4624 | p = kzalloc(256, GFP_KERNEL); |
| 4625 | kfree(p); |
| 4626 | p[50] = 0x9a; |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4627 | pr_err("\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", p); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4628 | validate_slab_cache(kmalloc_caches[8]); |
| 4629 | |
| 4630 | p = kzalloc(512, GFP_KERNEL); |
| 4631 | kfree(p); |
| 4632 | p[512] = 0xab; |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 4633 | pr_err("\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4634 | validate_slab_cache(kmalloc_caches[9]); |
| 4635 | } |
| 4636 | #else |
| 4637 | #ifdef CONFIG_SYSFS |
| 4638 | static void resiliency_test(void) {}; |
| 4639 | #endif |
| 4640 | #endif |
| 4641 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4642 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4643 | enum slab_stat_type { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4644 | SL_ALL, /* All slabs */ |
| 4645 | SL_PARTIAL, /* Only partially allocated slabs */ |
| 4646 | SL_CPU, /* Only slabs used for cpu caches */ |
| 4647 | SL_OBJECTS, /* Determine allocated objects not slabs */ |
| 4648 | SL_TOTAL /* Determine object capacity not slabs */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4649 | }; |
| 4650 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4651 | #define SO_ALL (1 << SL_ALL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4652 | #define SO_PARTIAL (1 << SL_PARTIAL) |
| 4653 | #define SO_CPU (1 << SL_CPU) |
| 4654 | #define SO_OBJECTS (1 << SL_OBJECTS) |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4655 | #define SO_TOTAL (1 << SL_TOTAL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4656 | |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4657 | static ssize_t show_slab_objects(struct kmem_cache *s, |
| 4658 | char *buf, unsigned long flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4659 | { |
| 4660 | unsigned long total = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4661 | int node; |
| 4662 | int x; |
| 4663 | unsigned long *nodes; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4664 | |
Chen Gang | e35e1a9 | 2013-07-12 08:23:48 +0800 | [diff] [blame] | 4665 | nodes = kzalloc(sizeof(unsigned long) * nr_node_ids, GFP_KERNEL); |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4666 | if (!nodes) |
| 4667 | return -ENOMEM; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4668 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4669 | if (flags & SO_CPU) { |
| 4670 | int cpu; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4671 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4672 | for_each_possible_cpu(cpu) { |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 4673 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, |
| 4674 | cpu); |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4675 | int node; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4676 | struct page *page; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4677 | |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 4678 | page = READ_ONCE(c->page); |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4679 | if (!page) |
| 4680 | continue; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4681 | |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4682 | node = page_to_nid(page); |
| 4683 | if (flags & SO_TOTAL) |
| 4684 | x = page->objects; |
| 4685 | else if (flags & SO_OBJECTS) |
| 4686 | x = page->inuse; |
| 4687 | else |
| 4688 | x = 1; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4689 | |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4690 | total += x; |
| 4691 | nodes[node] += x; |
| 4692 | |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 4693 | page = READ_ONCE(c->partial); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4694 | if (page) { |
Li Zefan | 8afb147 | 2013-09-10 11:43:37 +0800 | [diff] [blame] | 4695 | node = page_to_nid(page); |
| 4696 | if (flags & SO_TOTAL) |
| 4697 | WARN_ON_ONCE(1); |
| 4698 | else if (flags & SO_OBJECTS) |
| 4699 | WARN_ON_ONCE(1); |
| 4700 | else |
| 4701 | x = page->pages; |
Eric Dumazet | bc6697d | 2011-11-22 16:02:02 +0100 | [diff] [blame] | 4702 | total += x; |
| 4703 | nodes[node] += x; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4704 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4705 | } |
| 4706 | } |
| 4707 | |
Vladimir Davydov | bfc8c90 | 2014-06-04 16:07:18 -0700 | [diff] [blame] | 4708 | get_online_mems(); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4709 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4710 | if (flags & SO_ALL) { |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4711 | struct kmem_cache_node *n; |
| 4712 | |
| 4713 | for_each_kmem_cache_node(s, node, n) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4714 | |
Chen Gang | d0e0ac9 | 2013-07-15 09:05:29 +0800 | [diff] [blame] | 4715 | if (flags & SO_TOTAL) |
| 4716 | x = atomic_long_read(&n->total_objects); |
| 4717 | else if (flags & SO_OBJECTS) |
| 4718 | x = atomic_long_read(&n->total_objects) - |
| 4719 | count_partial(n, count_free); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4720 | else |
| 4721 | x = atomic_long_read(&n->nr_slabs); |
| 4722 | total += x; |
| 4723 | nodes[node] += x; |
| 4724 | } |
| 4725 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4726 | } else |
| 4727 | #endif |
| 4728 | if (flags & SO_PARTIAL) { |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4729 | struct kmem_cache_node *n; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4730 | |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4731 | for_each_kmem_cache_node(s, node, n) { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4732 | if (flags & SO_TOTAL) |
| 4733 | x = count_partial(n, count_total); |
| 4734 | else if (flags & SO_OBJECTS) |
| 4735 | x = count_partial(n, count_inuse); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4736 | else |
| 4737 | x = n->nr_partial; |
| 4738 | total += x; |
| 4739 | nodes[node] += x; |
| 4740 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4741 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4742 | x = sprintf(buf, "%lu", total); |
| 4743 | #ifdef CONFIG_NUMA |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4744 | for (node = 0; node < nr_node_ids; node++) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4745 | if (nodes[node]) |
| 4746 | x += sprintf(buf + x, " N%d=%lu", |
| 4747 | node, nodes[node]); |
| 4748 | #endif |
Vladimir Davydov | bfc8c90 | 2014-06-04 16:07:18 -0700 | [diff] [blame] | 4749 | put_online_mems(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4750 | kfree(nodes); |
| 4751 | return x + sprintf(buf + x, "\n"); |
| 4752 | } |
| 4753 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4754 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4755 | static int any_slab_objects(struct kmem_cache *s) |
| 4756 | { |
| 4757 | int node; |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4758 | struct kmem_cache_node *n; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4759 | |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4760 | for_each_kmem_cache_node(s, node, n) |
Benjamin Herrenschmidt | 4ea33e2 | 2008-05-06 20:42:39 -0700 | [diff] [blame] | 4761 | if (atomic_long_read(&n->total_objects)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4762 | return 1; |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 4763 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4764 | return 0; |
| 4765 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4766 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4767 | |
| 4768 | #define to_slab_attr(n) container_of(n, struct slab_attribute, attr) |
Phil Carmody | 497888c | 2011-07-14 15:07:13 +0300 | [diff] [blame] | 4769 | #define to_slab(n) container_of(n, struct kmem_cache, kobj) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4770 | |
| 4771 | struct slab_attribute { |
| 4772 | struct attribute attr; |
| 4773 | ssize_t (*show)(struct kmem_cache *s, char *buf); |
| 4774 | ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count); |
| 4775 | }; |
| 4776 | |
| 4777 | #define SLAB_ATTR_RO(_name) \ |
Vasiliy Kulikov | ab067e9 | 2011-09-27 21:54:53 +0400 | [diff] [blame] | 4778 | static struct slab_attribute _name##_attr = \ |
| 4779 | __ATTR(_name, 0400, _name##_show, NULL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4780 | |
| 4781 | #define SLAB_ATTR(_name) \ |
| 4782 | static struct slab_attribute _name##_attr = \ |
Vasiliy Kulikov | ab067e9 | 2011-09-27 21:54:53 +0400 | [diff] [blame] | 4783 | __ATTR(_name, 0600, _name##_show, _name##_store) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4784 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4785 | static ssize_t slab_size_show(struct kmem_cache *s, char *buf) |
| 4786 | { |
| 4787 | return sprintf(buf, "%d\n", s->size); |
| 4788 | } |
| 4789 | SLAB_ATTR_RO(slab_size); |
| 4790 | |
| 4791 | static ssize_t align_show(struct kmem_cache *s, char *buf) |
| 4792 | { |
| 4793 | return sprintf(buf, "%d\n", s->align); |
| 4794 | } |
| 4795 | SLAB_ATTR_RO(align); |
| 4796 | |
| 4797 | static ssize_t object_size_show(struct kmem_cache *s, char *buf) |
| 4798 | { |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 4799 | return sprintf(buf, "%d\n", s->object_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4800 | } |
| 4801 | SLAB_ATTR_RO(object_size); |
| 4802 | |
| 4803 | static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf) |
| 4804 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4805 | return sprintf(buf, "%d\n", oo_objects(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4806 | } |
| 4807 | SLAB_ATTR_RO(objs_per_slab); |
| 4808 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4809 | static ssize_t order_store(struct kmem_cache *s, |
| 4810 | const char *buf, size_t length) |
| 4811 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4812 | unsigned long order; |
| 4813 | int err; |
| 4814 | |
Jingoo Han | 3dbb95f | 2013-09-11 14:20:25 -0700 | [diff] [blame] | 4815 | err = kstrtoul(buf, 10, &order); |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4816 | if (err) |
| 4817 | return err; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4818 | |
| 4819 | if (order > slub_max_order || order < slub_min_order) |
| 4820 | return -EINVAL; |
| 4821 | |
| 4822 | calculate_sizes(s, order); |
| 4823 | return length; |
| 4824 | } |
| 4825 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4826 | static ssize_t order_show(struct kmem_cache *s, char *buf) |
| 4827 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4828 | return sprintf(buf, "%d\n", oo_order(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4829 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4830 | SLAB_ATTR(order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4831 | |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4832 | static ssize_t min_partial_show(struct kmem_cache *s, char *buf) |
| 4833 | { |
| 4834 | return sprintf(buf, "%lu\n", s->min_partial); |
| 4835 | } |
| 4836 | |
| 4837 | static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, |
| 4838 | size_t length) |
| 4839 | { |
| 4840 | unsigned long min; |
| 4841 | int err; |
| 4842 | |
Jingoo Han | 3dbb95f | 2013-09-11 14:20:25 -0700 | [diff] [blame] | 4843 | err = kstrtoul(buf, 10, &min); |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4844 | if (err) |
| 4845 | return err; |
| 4846 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 4847 | set_min_partial(s, min); |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4848 | return length; |
| 4849 | } |
| 4850 | SLAB_ATTR(min_partial); |
| 4851 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4852 | static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf) |
| 4853 | { |
| 4854 | return sprintf(buf, "%u\n", s->cpu_partial); |
| 4855 | } |
| 4856 | |
| 4857 | static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf, |
| 4858 | size_t length) |
| 4859 | { |
| 4860 | unsigned long objects; |
| 4861 | int err; |
| 4862 | |
Jingoo Han | 3dbb95f | 2013-09-11 14:20:25 -0700 | [diff] [blame] | 4863 | err = kstrtoul(buf, 10, &objects); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4864 | if (err) |
| 4865 | return err; |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 4866 | if (objects && !kmem_cache_has_cpu_partial(s)) |
David Rientjes | 74ee4ef | 2012-01-09 13:19:45 -0800 | [diff] [blame] | 4867 | return -EINVAL; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4868 | |
| 4869 | s->cpu_partial = objects; |
| 4870 | flush_all(s); |
| 4871 | return length; |
| 4872 | } |
| 4873 | SLAB_ATTR(cpu_partial); |
| 4874 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4875 | static ssize_t ctor_show(struct kmem_cache *s, char *buf) |
| 4876 | { |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4877 | if (!s->ctor) |
| 4878 | return 0; |
| 4879 | return sprintf(buf, "%pS\n", s->ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4880 | } |
| 4881 | SLAB_ATTR_RO(ctor); |
| 4882 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4883 | static ssize_t aliases_show(struct kmem_cache *s, char *buf) |
| 4884 | { |
Gu Zheng | 4307c14 | 2014-08-06 16:04:51 -0700 | [diff] [blame] | 4885 | return sprintf(buf, "%d\n", s->refcount < 0 ? 0 : s->refcount - 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4886 | } |
| 4887 | SLAB_ATTR_RO(aliases); |
| 4888 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4889 | static ssize_t partial_show(struct kmem_cache *s, char *buf) |
| 4890 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4891 | return show_slab_objects(s, buf, SO_PARTIAL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4892 | } |
| 4893 | SLAB_ATTR_RO(partial); |
| 4894 | |
| 4895 | static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf) |
| 4896 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4897 | return show_slab_objects(s, buf, SO_CPU); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4898 | } |
| 4899 | SLAB_ATTR_RO(cpu_slabs); |
| 4900 | |
| 4901 | static ssize_t objects_show(struct kmem_cache *s, char *buf) |
| 4902 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4903 | return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4904 | } |
| 4905 | SLAB_ATTR_RO(objects); |
| 4906 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4907 | static ssize_t objects_partial_show(struct kmem_cache *s, char *buf) |
| 4908 | { |
| 4909 | return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS); |
| 4910 | } |
| 4911 | SLAB_ATTR_RO(objects_partial); |
| 4912 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4913 | static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) |
| 4914 | { |
| 4915 | int objects = 0; |
| 4916 | int pages = 0; |
| 4917 | int cpu; |
| 4918 | int len; |
| 4919 | |
| 4920 | for_each_online_cpu(cpu) { |
| 4921 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu)->partial; |
| 4922 | |
| 4923 | if (page) { |
| 4924 | pages += page->pages; |
| 4925 | objects += page->pobjects; |
| 4926 | } |
| 4927 | } |
| 4928 | |
| 4929 | len = sprintf(buf, "%d(%d)", objects, pages); |
| 4930 | |
| 4931 | #ifdef CONFIG_SMP |
| 4932 | for_each_online_cpu(cpu) { |
| 4933 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu) ->partial; |
| 4934 | |
| 4935 | if (page && len < PAGE_SIZE - 20) |
| 4936 | len += sprintf(buf + len, " C%d=%d(%d)", cpu, |
| 4937 | page->pobjects, page->pages); |
| 4938 | } |
| 4939 | #endif |
| 4940 | return len + sprintf(buf + len, "\n"); |
| 4941 | } |
| 4942 | SLAB_ATTR_RO(slabs_cpu_partial); |
| 4943 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4944 | static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf) |
| 4945 | { |
| 4946 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT)); |
| 4947 | } |
| 4948 | |
| 4949 | static ssize_t reclaim_account_store(struct kmem_cache *s, |
| 4950 | const char *buf, size_t length) |
| 4951 | { |
| 4952 | s->flags &= ~SLAB_RECLAIM_ACCOUNT; |
| 4953 | if (buf[0] == '1') |
| 4954 | s->flags |= SLAB_RECLAIM_ACCOUNT; |
| 4955 | return length; |
| 4956 | } |
| 4957 | SLAB_ATTR(reclaim_account); |
| 4958 | |
| 4959 | static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf) |
| 4960 | { |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 4961 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4962 | } |
| 4963 | SLAB_ATTR_RO(hwcache_align); |
| 4964 | |
| 4965 | #ifdef CONFIG_ZONE_DMA |
| 4966 | static ssize_t cache_dma_show(struct kmem_cache *s, char *buf) |
| 4967 | { |
| 4968 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA)); |
| 4969 | } |
| 4970 | SLAB_ATTR_RO(cache_dma); |
| 4971 | #endif |
| 4972 | |
| 4973 | static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf) |
| 4974 | { |
| 4975 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU)); |
| 4976 | } |
| 4977 | SLAB_ATTR_RO(destroy_by_rcu); |
| 4978 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 4979 | static ssize_t reserved_show(struct kmem_cache *s, char *buf) |
| 4980 | { |
| 4981 | return sprintf(buf, "%d\n", s->reserved); |
| 4982 | } |
| 4983 | SLAB_ATTR_RO(reserved); |
| 4984 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4985 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4986 | static ssize_t slabs_show(struct kmem_cache *s, char *buf) |
| 4987 | { |
| 4988 | return show_slab_objects(s, buf, SO_ALL); |
| 4989 | } |
| 4990 | SLAB_ATTR_RO(slabs); |
| 4991 | |
| 4992 | static ssize_t total_objects_show(struct kmem_cache *s, char *buf) |
| 4993 | { |
| 4994 | return show_slab_objects(s, buf, SO_ALL|SO_TOTAL); |
| 4995 | } |
| 4996 | SLAB_ATTR_RO(total_objects); |
| 4997 | |
| 4998 | static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf) |
| 4999 | { |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 5000 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CONSISTENCY_CHECKS)); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5001 | } |
| 5002 | |
| 5003 | static ssize_t sanity_checks_store(struct kmem_cache *s, |
| 5004 | const char *buf, size_t length) |
| 5005 | { |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 5006 | s->flags &= ~SLAB_CONSISTENCY_CHECKS; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5007 | if (buf[0] == '1') { |
| 5008 | s->flags &= ~__CMPXCHG_DOUBLE; |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 5009 | s->flags |= SLAB_CONSISTENCY_CHECKS; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5010 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5011 | return length; |
| 5012 | } |
| 5013 | SLAB_ATTR(sanity_checks); |
| 5014 | |
| 5015 | static ssize_t trace_show(struct kmem_cache *s, char *buf) |
| 5016 | { |
| 5017 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE)); |
| 5018 | } |
| 5019 | |
| 5020 | static ssize_t trace_store(struct kmem_cache *s, const char *buf, |
| 5021 | size_t length) |
| 5022 | { |
Christoph Lameter | c9e1613 | 2014-10-09 15:26:11 -0700 | [diff] [blame] | 5023 | /* |
| 5024 | * Tracing a merged cache is going to give confusing results |
| 5025 | * as well as cause other issues like converting a mergeable |
| 5026 | * cache into an umergeable one. |
| 5027 | */ |
| 5028 | if (s->refcount > 1) |
| 5029 | return -EINVAL; |
| 5030 | |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5031 | s->flags &= ~SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5032 | if (buf[0] == '1') { |
| 5033 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5034 | s->flags |= SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5035 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5036 | return length; |
| 5037 | } |
| 5038 | SLAB_ATTR(trace); |
| 5039 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5040 | static ssize_t red_zone_show(struct kmem_cache *s, char *buf) |
| 5041 | { |
| 5042 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE)); |
| 5043 | } |
| 5044 | |
| 5045 | static ssize_t red_zone_store(struct kmem_cache *s, |
| 5046 | const char *buf, size_t length) |
| 5047 | { |
| 5048 | if (any_slab_objects(s)) |
| 5049 | return -EBUSY; |
| 5050 | |
| 5051 | s->flags &= ~SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5052 | if (buf[0] == '1') { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5053 | s->flags |= SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5054 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 5055 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5056 | return length; |
| 5057 | } |
| 5058 | SLAB_ATTR(red_zone); |
| 5059 | |
| 5060 | static ssize_t poison_show(struct kmem_cache *s, char *buf) |
| 5061 | { |
| 5062 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON)); |
| 5063 | } |
| 5064 | |
| 5065 | static ssize_t poison_store(struct kmem_cache *s, |
| 5066 | const char *buf, size_t length) |
| 5067 | { |
| 5068 | if (any_slab_objects(s)) |
| 5069 | return -EBUSY; |
| 5070 | |
| 5071 | s->flags &= ~SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5072 | if (buf[0] == '1') { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5073 | s->flags |= SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5074 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 5075 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5076 | return length; |
| 5077 | } |
| 5078 | SLAB_ATTR(poison); |
| 5079 | |
| 5080 | static ssize_t store_user_show(struct kmem_cache *s, char *buf) |
| 5081 | { |
| 5082 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER)); |
| 5083 | } |
| 5084 | |
| 5085 | static ssize_t store_user_store(struct kmem_cache *s, |
| 5086 | const char *buf, size_t length) |
| 5087 | { |
| 5088 | if (any_slab_objects(s)) |
| 5089 | return -EBUSY; |
| 5090 | |
| 5091 | s->flags &= ~SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5092 | if (buf[0] == '1') { |
| 5093 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5094 | s->flags |= SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5095 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 5096 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5097 | return length; |
| 5098 | } |
| 5099 | SLAB_ATTR(store_user); |
| 5100 | |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 5101 | static ssize_t validate_show(struct kmem_cache *s, char *buf) |
| 5102 | { |
| 5103 | return 0; |
| 5104 | } |
| 5105 | |
| 5106 | static ssize_t validate_store(struct kmem_cache *s, |
| 5107 | const char *buf, size_t length) |
| 5108 | { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 5109 | int ret = -EINVAL; |
| 5110 | |
| 5111 | if (buf[0] == '1') { |
| 5112 | ret = validate_slab_cache(s); |
| 5113 | if (ret >= 0) |
| 5114 | ret = length; |
| 5115 | } |
| 5116 | return ret; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 5117 | } |
| 5118 | SLAB_ATTR(validate); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5119 | |
| 5120 | static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf) |
| 5121 | { |
| 5122 | if (!(s->flags & SLAB_STORE_USER)) |
| 5123 | return -ENOSYS; |
| 5124 | return list_locations(s, buf, TRACK_ALLOC); |
| 5125 | } |
| 5126 | SLAB_ATTR_RO(alloc_calls); |
| 5127 | |
| 5128 | static ssize_t free_calls_show(struct kmem_cache *s, char *buf) |
| 5129 | { |
| 5130 | if (!(s->flags & SLAB_STORE_USER)) |
| 5131 | return -ENOSYS; |
| 5132 | return list_locations(s, buf, TRACK_FREE); |
| 5133 | } |
| 5134 | SLAB_ATTR_RO(free_calls); |
| 5135 | #endif /* CONFIG_SLUB_DEBUG */ |
| 5136 | |
| 5137 | #ifdef CONFIG_FAILSLAB |
| 5138 | static ssize_t failslab_show(struct kmem_cache *s, char *buf) |
| 5139 | { |
| 5140 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB)); |
| 5141 | } |
| 5142 | |
| 5143 | static ssize_t failslab_store(struct kmem_cache *s, const char *buf, |
| 5144 | size_t length) |
| 5145 | { |
Christoph Lameter | c9e1613 | 2014-10-09 15:26:11 -0700 | [diff] [blame] | 5146 | if (s->refcount > 1) |
| 5147 | return -EINVAL; |
| 5148 | |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5149 | s->flags &= ~SLAB_FAILSLAB; |
| 5150 | if (buf[0] == '1') |
| 5151 | s->flags |= SLAB_FAILSLAB; |
| 5152 | return length; |
| 5153 | } |
| 5154 | SLAB_ATTR(failslab); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 5155 | #endif |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 5156 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 5157 | static ssize_t shrink_show(struct kmem_cache *s, char *buf) |
| 5158 | { |
| 5159 | return 0; |
| 5160 | } |
| 5161 | |
| 5162 | static ssize_t shrink_store(struct kmem_cache *s, |
| 5163 | const char *buf, size_t length) |
| 5164 | { |
Vladimir Davydov | 832f37f | 2015-02-12 14:59:41 -0800 | [diff] [blame] | 5165 | if (buf[0] == '1') |
| 5166 | kmem_cache_shrink(s); |
| 5167 | else |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 5168 | return -EINVAL; |
| 5169 | return length; |
| 5170 | } |
| 5171 | SLAB_ATTR(shrink); |
| 5172 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5173 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 5174 | static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5175 | { |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 5176 | return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5177 | } |
| 5178 | |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 5179 | static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5180 | const char *buf, size_t length) |
| 5181 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 5182 | unsigned long ratio; |
| 5183 | int err; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5184 | |
Jingoo Han | 3dbb95f | 2013-09-11 14:20:25 -0700 | [diff] [blame] | 5185 | err = kstrtoul(buf, 10, &ratio); |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 5186 | if (err) |
| 5187 | return err; |
| 5188 | |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 5189 | if (ratio <= 100) |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 5190 | s->remote_node_defrag_ratio = ratio * 10; |
| 5191 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5192 | return length; |
| 5193 | } |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 5194 | SLAB_ATTR(remote_node_defrag_ratio); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5195 | #endif |
| 5196 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5197 | #ifdef CONFIG_SLUB_STATS |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5198 | static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) |
| 5199 | { |
| 5200 | unsigned long sum = 0; |
| 5201 | int cpu; |
| 5202 | int len; |
| 5203 | int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL); |
| 5204 | |
| 5205 | if (!data) |
| 5206 | return -ENOMEM; |
| 5207 | |
| 5208 | for_each_online_cpu(cpu) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 5209 | unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5210 | |
| 5211 | data[cpu] = x; |
| 5212 | sum += x; |
| 5213 | } |
| 5214 | |
| 5215 | len = sprintf(buf, "%lu", sum); |
| 5216 | |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 5217 | #ifdef CONFIG_SMP |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5218 | for_each_online_cpu(cpu) { |
| 5219 | if (data[cpu] && len < PAGE_SIZE - 20) |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 5220 | len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5221 | } |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 5222 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5223 | kfree(data); |
| 5224 | return len + sprintf(buf + len, "\n"); |
| 5225 | } |
| 5226 | |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 5227 | static void clear_stat(struct kmem_cache *s, enum stat_item si) |
| 5228 | { |
| 5229 | int cpu; |
| 5230 | |
| 5231 | for_each_online_cpu(cpu) |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 5232 | per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 5233 | } |
| 5234 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5235 | #define STAT_ATTR(si, text) \ |
| 5236 | static ssize_t text##_show(struct kmem_cache *s, char *buf) \ |
| 5237 | { \ |
| 5238 | return show_stat(s, buf, si); \ |
| 5239 | } \ |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 5240 | static ssize_t text##_store(struct kmem_cache *s, \ |
| 5241 | const char *buf, size_t length) \ |
| 5242 | { \ |
| 5243 | if (buf[0] != '0') \ |
| 5244 | return -EINVAL; \ |
| 5245 | clear_stat(s, si); \ |
| 5246 | return length; \ |
| 5247 | } \ |
| 5248 | SLAB_ATTR(text); \ |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5249 | |
| 5250 | STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); |
| 5251 | STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); |
| 5252 | STAT_ATTR(FREE_FASTPATH, free_fastpath); |
| 5253 | STAT_ATTR(FREE_SLOWPATH, free_slowpath); |
| 5254 | STAT_ATTR(FREE_FROZEN, free_frozen); |
| 5255 | STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); |
| 5256 | STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); |
| 5257 | STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); |
| 5258 | STAT_ATTR(ALLOC_SLAB, alloc_slab); |
| 5259 | STAT_ATTR(ALLOC_REFILL, alloc_refill); |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 5260 | STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5261 | STAT_ATTR(FREE_SLAB, free_slab); |
| 5262 | STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); |
| 5263 | STAT_ATTR(DEACTIVATE_FULL, deactivate_full); |
| 5264 | STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); |
| 5265 | STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); |
| 5266 | STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); |
| 5267 | STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 5268 | STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5269 | STAT_ATTR(ORDER_FALLBACK, order_fallback); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5270 | STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail); |
| 5271 | STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 5272 | STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc); |
| 5273 | STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free); |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 5274 | STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node); |
| 5275 | STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5276 | #endif |
| 5277 | |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 5278 | static struct attribute *slab_attrs[] = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5279 | &slab_size_attr.attr, |
| 5280 | &object_size_attr.attr, |
| 5281 | &objs_per_slab_attr.attr, |
| 5282 | &order_attr.attr, |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 5283 | &min_partial_attr.attr, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 5284 | &cpu_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5285 | &objects_attr.attr, |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5286 | &objects_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5287 | &partial_attr.attr, |
| 5288 | &cpu_slabs_attr.attr, |
| 5289 | &ctor_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5290 | &aliases_attr.attr, |
| 5291 | &align_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5292 | &hwcache_align_attr.attr, |
| 5293 | &reclaim_account_attr.attr, |
| 5294 | &destroy_by_rcu_attr.attr, |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5295 | &shrink_attr.attr, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 5296 | &reserved_attr.attr, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 5297 | &slabs_cpu_partial_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 5298 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 5299 | &total_objects_attr.attr, |
| 5300 | &slabs_attr.attr, |
| 5301 | &sanity_checks_attr.attr, |
| 5302 | &trace_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5303 | &red_zone_attr.attr, |
| 5304 | &poison_attr.attr, |
| 5305 | &store_user_attr.attr, |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 5306 | &validate_attr.attr, |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 5307 | &alloc_calls_attr.attr, |
| 5308 | &free_calls_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 5309 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5310 | #ifdef CONFIG_ZONE_DMA |
| 5311 | &cache_dma_attr.attr, |
| 5312 | #endif |
| 5313 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 5314 | &remote_node_defrag_ratio_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5315 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5316 | #ifdef CONFIG_SLUB_STATS |
| 5317 | &alloc_fastpath_attr.attr, |
| 5318 | &alloc_slowpath_attr.attr, |
| 5319 | &free_fastpath_attr.attr, |
| 5320 | &free_slowpath_attr.attr, |
| 5321 | &free_frozen_attr.attr, |
| 5322 | &free_add_partial_attr.attr, |
| 5323 | &free_remove_partial_attr.attr, |
| 5324 | &alloc_from_partial_attr.attr, |
| 5325 | &alloc_slab_attr.attr, |
| 5326 | &alloc_refill_attr.attr, |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 5327 | &alloc_node_mismatch_attr.attr, |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5328 | &free_slab_attr.attr, |
| 5329 | &cpuslab_flush_attr.attr, |
| 5330 | &deactivate_full_attr.attr, |
| 5331 | &deactivate_empty_attr.attr, |
| 5332 | &deactivate_to_head_attr.attr, |
| 5333 | &deactivate_to_tail_attr.attr, |
| 5334 | &deactivate_remote_frees_attr.attr, |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 5335 | &deactivate_bypass_attr.attr, |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5336 | &order_fallback_attr.attr, |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 5337 | &cmpxchg_double_fail_attr.attr, |
| 5338 | &cmpxchg_double_cpu_fail_attr.attr, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 5339 | &cpu_partial_alloc_attr.attr, |
| 5340 | &cpu_partial_free_attr.attr, |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 5341 | &cpu_partial_node_attr.attr, |
| 5342 | &cpu_partial_drain_attr.attr, |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 5343 | #endif |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 5344 | #ifdef CONFIG_FAILSLAB |
| 5345 | &failslab_attr.attr, |
| 5346 | #endif |
| 5347 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5348 | NULL |
| 5349 | }; |
| 5350 | |
| 5351 | static struct attribute_group slab_attr_group = { |
| 5352 | .attrs = slab_attrs, |
| 5353 | }; |
| 5354 | |
| 5355 | static ssize_t slab_attr_show(struct kobject *kobj, |
| 5356 | struct attribute *attr, |
| 5357 | char *buf) |
| 5358 | { |
| 5359 | struct slab_attribute *attribute; |
| 5360 | struct kmem_cache *s; |
| 5361 | int err; |
| 5362 | |
| 5363 | attribute = to_slab_attr(attr); |
| 5364 | s = to_slab(kobj); |
| 5365 | |
| 5366 | if (!attribute->show) |
| 5367 | return -EIO; |
| 5368 | |
| 5369 | err = attribute->show(s, buf); |
| 5370 | |
| 5371 | return err; |
| 5372 | } |
| 5373 | |
| 5374 | static ssize_t slab_attr_store(struct kobject *kobj, |
| 5375 | struct attribute *attr, |
| 5376 | const char *buf, size_t len) |
| 5377 | { |
| 5378 | struct slab_attribute *attribute; |
| 5379 | struct kmem_cache *s; |
| 5380 | int err; |
| 5381 | |
| 5382 | attribute = to_slab_attr(attr); |
| 5383 | s = to_slab(kobj); |
| 5384 | |
| 5385 | if (!attribute->store) |
| 5386 | return -EIO; |
| 5387 | |
| 5388 | err = attribute->store(s, buf, len); |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 5389 | #ifdef CONFIG_MEMCG |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5390 | if (slab_state >= FULL && err >= 0 && is_root_cache(s)) { |
Vladimir Davydov | 426589f | 2015-02-12 14:59:23 -0800 | [diff] [blame] | 5391 | struct kmem_cache *c; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5392 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5393 | mutex_lock(&slab_mutex); |
| 5394 | if (s->max_attr_size < len) |
| 5395 | s->max_attr_size = len; |
| 5396 | |
Glauber Costa | ebe945c | 2012-12-18 14:23:10 -0800 | [diff] [blame] | 5397 | /* |
| 5398 | * This is a best effort propagation, so this function's return |
| 5399 | * value will be determined by the parent cache only. This is |
| 5400 | * basically because not all attributes will have a well |
| 5401 | * defined semantics for rollbacks - most of the actions will |
| 5402 | * have permanent effects. |
| 5403 | * |
| 5404 | * Returning the error value of any of the children that fail |
| 5405 | * is not 100 % defined, in the sense that users seeing the |
| 5406 | * error code won't be able to know anything about the state of |
| 5407 | * the cache. |
| 5408 | * |
| 5409 | * Only returning the error code for the parent cache at least |
| 5410 | * has well defined semantics. The cache being written to |
| 5411 | * directly either failed or succeeded, in which case we loop |
| 5412 | * through the descendants with best-effort propagation. |
| 5413 | */ |
Vladimir Davydov | 426589f | 2015-02-12 14:59:23 -0800 | [diff] [blame] | 5414 | for_each_memcg_cache(c, s) |
| 5415 | attribute->store(c, buf, len); |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5416 | mutex_unlock(&slab_mutex); |
| 5417 | } |
| 5418 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5419 | return err; |
| 5420 | } |
| 5421 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5422 | static void memcg_propagate_slab_attrs(struct kmem_cache *s) |
| 5423 | { |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 5424 | #ifdef CONFIG_MEMCG |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5425 | int i; |
| 5426 | char *buffer = NULL; |
Vladimir Davydov | 93030d8 | 2014-05-06 12:49:59 -0700 | [diff] [blame] | 5427 | struct kmem_cache *root_cache; |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5428 | |
Vladimir Davydov | 93030d8 | 2014-05-06 12:49:59 -0700 | [diff] [blame] | 5429 | if (is_root_cache(s)) |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5430 | return; |
| 5431 | |
Vladimir Davydov | f7ce319 | 2015-02-12 14:59:20 -0800 | [diff] [blame] | 5432 | root_cache = s->memcg_params.root_cache; |
Vladimir Davydov | 93030d8 | 2014-05-06 12:49:59 -0700 | [diff] [blame] | 5433 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5434 | /* |
| 5435 | * This mean this cache had no attribute written. Therefore, no point |
| 5436 | * in copying default values around |
| 5437 | */ |
Vladimir Davydov | 93030d8 | 2014-05-06 12:49:59 -0700 | [diff] [blame] | 5438 | if (!root_cache->max_attr_size) |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5439 | return; |
| 5440 | |
| 5441 | for (i = 0; i < ARRAY_SIZE(slab_attrs); i++) { |
| 5442 | char mbuf[64]; |
| 5443 | char *buf; |
| 5444 | struct slab_attribute *attr = to_slab_attr(slab_attrs[i]); |
| 5445 | |
| 5446 | if (!attr || !attr->store || !attr->show) |
| 5447 | continue; |
| 5448 | |
| 5449 | /* |
| 5450 | * It is really bad that we have to allocate here, so we will |
| 5451 | * do it only as a fallback. If we actually allocate, though, |
| 5452 | * we can just use the allocated buffer until the end. |
| 5453 | * |
| 5454 | * Most of the slub attributes will tend to be very small in |
| 5455 | * size, but sysfs allows buffers up to a page, so they can |
| 5456 | * theoretically happen. |
| 5457 | */ |
| 5458 | if (buffer) |
| 5459 | buf = buffer; |
Vladimir Davydov | 93030d8 | 2014-05-06 12:49:59 -0700 | [diff] [blame] | 5460 | else if (root_cache->max_attr_size < ARRAY_SIZE(mbuf)) |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5461 | buf = mbuf; |
| 5462 | else { |
| 5463 | buffer = (char *) get_zeroed_page(GFP_KERNEL); |
| 5464 | if (WARN_ON(!buffer)) |
| 5465 | continue; |
| 5466 | buf = buffer; |
| 5467 | } |
| 5468 | |
Vladimir Davydov | 93030d8 | 2014-05-06 12:49:59 -0700 | [diff] [blame] | 5469 | attr->show(root_cache, buf); |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5470 | attr->store(s, buf, strlen(buf)); |
| 5471 | } |
| 5472 | |
| 5473 | if (buffer) |
| 5474 | free_page((unsigned long)buffer); |
| 5475 | #endif |
| 5476 | } |
| 5477 | |
Christoph Lameter | 41a2128 | 2014-05-06 12:50:08 -0700 | [diff] [blame] | 5478 | static void kmem_cache_release(struct kobject *k) |
| 5479 | { |
| 5480 | slab_kmem_cache_release(to_slab(k)); |
| 5481 | } |
| 5482 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 5483 | static const struct sysfs_ops slab_sysfs_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5484 | .show = slab_attr_show, |
| 5485 | .store = slab_attr_store, |
| 5486 | }; |
| 5487 | |
| 5488 | static struct kobj_type slab_ktype = { |
| 5489 | .sysfs_ops = &slab_sysfs_ops, |
Christoph Lameter | 41a2128 | 2014-05-06 12:50:08 -0700 | [diff] [blame] | 5490 | .release = kmem_cache_release, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5491 | }; |
| 5492 | |
| 5493 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| 5494 | { |
| 5495 | struct kobj_type *ktype = get_ktype(kobj); |
| 5496 | |
| 5497 | if (ktype == &slab_ktype) |
| 5498 | return 1; |
| 5499 | return 0; |
| 5500 | } |
| 5501 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 5502 | static const struct kset_uevent_ops slab_uevent_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5503 | .filter = uevent_filter, |
| 5504 | }; |
| 5505 | |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5506 | static struct kset *slab_kset; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5507 | |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5508 | static inline struct kset *cache_kset(struct kmem_cache *s) |
| 5509 | { |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 5510 | #ifdef CONFIG_MEMCG |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5511 | if (!is_root_cache(s)) |
Vladimir Davydov | f7ce319 | 2015-02-12 14:59:20 -0800 | [diff] [blame] | 5512 | return s->memcg_params.root_cache->memcg_kset; |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5513 | #endif |
| 5514 | return slab_kset; |
| 5515 | } |
| 5516 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5517 | #define ID_STR_LENGTH 64 |
| 5518 | |
| 5519 | /* Create a unique string id for a slab cache: |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 5520 | * |
| 5521 | * Format :[flags-]size |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5522 | */ |
| 5523 | static char *create_unique_id(struct kmem_cache *s) |
| 5524 | { |
| 5525 | char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL); |
| 5526 | char *p = name; |
| 5527 | |
| 5528 | BUG_ON(!name); |
| 5529 | |
| 5530 | *p++ = ':'; |
| 5531 | /* |
| 5532 | * First flags affecting slabcache operations. We will only |
| 5533 | * get here for aliasable slabs so we do not need to support |
| 5534 | * too many flags. The flags here must cover all flags that |
| 5535 | * are matched during merging to guarantee that the id is |
| 5536 | * unique. |
| 5537 | */ |
| 5538 | if (s->flags & SLAB_CACHE_DMA) |
| 5539 | *p++ = 'd'; |
| 5540 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 5541 | *p++ = 'a'; |
Laura Abbott | becfda6 | 2016-03-15 14:55:06 -0700 | [diff] [blame] | 5542 | if (s->flags & SLAB_CONSISTENCY_CHECKS) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5543 | *p++ = 'F'; |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 5544 | if (!(s->flags & SLAB_NOTRACK)) |
| 5545 | *p++ = 't'; |
Vladimir Davydov | 230e9fc | 2016-01-14 15:18:15 -0800 | [diff] [blame] | 5546 | if (s->flags & SLAB_ACCOUNT) |
| 5547 | *p++ = 'A'; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5548 | if (p != name + 1) |
| 5549 | *p++ = '-'; |
| 5550 | p += sprintf(p, "%07d", s->size); |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 5551 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5552 | BUG_ON(p > name + ID_STR_LENGTH - 1); |
| 5553 | return name; |
| 5554 | } |
| 5555 | |
| 5556 | static int sysfs_slab_add(struct kmem_cache *s) |
| 5557 | { |
| 5558 | int err; |
| 5559 | const char *name; |
Christoph Lameter | 45530c4 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 5560 | int unmergeable = slab_unmergeable(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5561 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5562 | if (unmergeable) { |
| 5563 | /* |
| 5564 | * Slabcache can never be merged so we can use the name proper. |
| 5565 | * This is typically the case for debug situations. In that |
| 5566 | * case we can catch duplicate names easily. |
| 5567 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5568 | sysfs_remove_link(&slab_kset->kobj, s->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5569 | name = s->name; |
| 5570 | } else { |
| 5571 | /* |
| 5572 | * Create a unique name for the slab as a target |
| 5573 | * for the symlinks. |
| 5574 | */ |
| 5575 | name = create_unique_id(s); |
| 5576 | } |
| 5577 | |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5578 | s->kobj.kset = cache_kset(s); |
Tetsuo Handa | 26e4f20 | 2014-01-04 16:32:31 +0900 | [diff] [blame] | 5579 | err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name); |
Dave Jones | 54b6a73 | 2014-04-07 15:39:32 -0700 | [diff] [blame] | 5580 | if (err) |
Konstantin Khlebnikov | 80da026 | 2015-09-04 15:45:51 -0700 | [diff] [blame] | 5581 | goto out; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5582 | |
| 5583 | err = sysfs_create_group(&s->kobj, &slab_attr_group); |
Dave Jones | 54b6a73 | 2014-04-07 15:39:32 -0700 | [diff] [blame] | 5584 | if (err) |
| 5585 | goto out_del_kobj; |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5586 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 5587 | #ifdef CONFIG_MEMCG |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5588 | if (is_root_cache(s)) { |
| 5589 | s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj); |
| 5590 | if (!s->memcg_kset) { |
Dave Jones | 54b6a73 | 2014-04-07 15:39:32 -0700 | [diff] [blame] | 5591 | err = -ENOMEM; |
| 5592 | goto out_del_kobj; |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5593 | } |
| 5594 | } |
| 5595 | #endif |
| 5596 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5597 | kobject_uevent(&s->kobj, KOBJ_ADD); |
| 5598 | if (!unmergeable) { |
| 5599 | /* Setup first alias */ |
| 5600 | sysfs_slab_alias(s, s->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5601 | } |
Dave Jones | 54b6a73 | 2014-04-07 15:39:32 -0700 | [diff] [blame] | 5602 | out: |
| 5603 | if (!unmergeable) |
| 5604 | kfree(name); |
| 5605 | return err; |
| 5606 | out_del_kobj: |
| 5607 | kobject_del(&s->kobj); |
Dave Jones | 54b6a73 | 2014-04-07 15:39:32 -0700 | [diff] [blame] | 5608 | goto out; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5609 | } |
| 5610 | |
Christoph Lameter | 41a2128 | 2014-05-06 12:50:08 -0700 | [diff] [blame] | 5611 | void sysfs_slab_remove(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5612 | { |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 5613 | if (slab_state < FULL) |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5614 | /* |
| 5615 | * Sysfs has not been setup yet so no need to remove the |
| 5616 | * cache from sysfs. |
| 5617 | */ |
| 5618 | return; |
| 5619 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 5620 | #ifdef CONFIG_MEMCG |
Vladimir Davydov | 9a41707 | 2014-04-07 15:39:31 -0700 | [diff] [blame] | 5621 | kset_unregister(s->memcg_kset); |
| 5622 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5623 | kobject_uevent(&s->kobj, KOBJ_REMOVE); |
| 5624 | kobject_del(&s->kobj); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 5625 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5626 | } |
| 5627 | |
| 5628 | /* |
| 5629 | * Need to buffer aliases during bootup until sysfs becomes |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 5630 | * available lest we lose that information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5631 | */ |
| 5632 | struct saved_alias { |
| 5633 | struct kmem_cache *s; |
| 5634 | const char *name; |
| 5635 | struct saved_alias *next; |
| 5636 | }; |
| 5637 | |
Adrian Bunk | 5af328a | 2007-07-17 04:03:27 -0700 | [diff] [blame] | 5638 | static struct saved_alias *alias_list; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5639 | |
| 5640 | static int sysfs_slab_alias(struct kmem_cache *s, const char *name) |
| 5641 | { |
| 5642 | struct saved_alias *al; |
| 5643 | |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 5644 | if (slab_state == FULL) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5645 | /* |
| 5646 | * If we have a leftover link then remove it. |
| 5647 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5648 | sysfs_remove_link(&slab_kset->kobj, name); |
| 5649 | return sysfs_create_link(&slab_kset->kobj, &s->kobj, name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5650 | } |
| 5651 | |
| 5652 | al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); |
| 5653 | if (!al) |
| 5654 | return -ENOMEM; |
| 5655 | |
| 5656 | al->s = s; |
| 5657 | al->name = name; |
| 5658 | al->next = alias_list; |
| 5659 | alias_list = al; |
| 5660 | return 0; |
| 5661 | } |
| 5662 | |
| 5663 | static int __init slab_sysfs_init(void) |
| 5664 | { |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 5665 | struct kmem_cache *s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5666 | int err; |
| 5667 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 5668 | mutex_lock(&slab_mutex); |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5669 | |
Greg Kroah-Hartman | 0ff21e4 | 2007-11-06 10:36:58 -0800 | [diff] [blame] | 5670 | slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj); |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5671 | if (!slab_kset) { |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 5672 | mutex_unlock(&slab_mutex); |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 5673 | pr_err("Cannot register slab subsystem.\n"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5674 | return -ENOSYS; |
| 5675 | } |
| 5676 | |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 5677 | slab_state = FULL; |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5678 | |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 5679 | list_for_each_entry(s, &slab_caches, list) { |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5680 | err = sysfs_slab_add(s); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5681 | if (err) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 5682 | pr_err("SLUB: Unable to add boot slab %s to sysfs\n", |
| 5683 | s->name); |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5684 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5685 | |
| 5686 | while (alias_list) { |
| 5687 | struct saved_alias *al = alias_list; |
| 5688 | |
| 5689 | alias_list = alias_list->next; |
| 5690 | err = sysfs_slab_alias(al->s, al->name); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5691 | if (err) |
Fabian Frederick | f9f5828 | 2014-06-04 16:06:34 -0700 | [diff] [blame] | 5692 | pr_err("SLUB: Unable to add boot slab alias %s to sysfs\n", |
| 5693 | al->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5694 | kfree(al); |
| 5695 | } |
| 5696 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 5697 | mutex_unlock(&slab_mutex); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5698 | resiliency_test(); |
| 5699 | return 0; |
| 5700 | } |
| 5701 | |
| 5702 | __initcall(slab_sysfs_init); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 5703 | #endif /* CONFIG_SYSFS */ |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5704 | |
| 5705 | /* |
| 5706 | * The /proc/slabinfo ABI |
| 5707 | */ |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5708 | #ifdef CONFIG_SLABINFO |
Glauber Costa | 0d7561c | 2012-10-19 18:20:27 +0400 | [diff] [blame] | 5709 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo) |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5710 | { |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5711 | unsigned long nr_slabs = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5712 | unsigned long nr_objs = 0; |
| 5713 | unsigned long nr_free = 0; |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5714 | int node; |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 5715 | struct kmem_cache_node *n; |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5716 | |
Christoph Lameter | fa45dc2 | 2014-08-06 16:04:09 -0700 | [diff] [blame] | 5717 | for_each_kmem_cache_node(s, node, n) { |
Wanpeng Li | c17fd13 | 2013-07-04 08:33:26 +0800 | [diff] [blame] | 5718 | nr_slabs += node_nr_slabs(n); |
| 5719 | nr_objs += node_nr_objs(n); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5720 | nr_free += count_partial(n, count_free); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5721 | } |
| 5722 | |
Glauber Costa | 0d7561c | 2012-10-19 18:20:27 +0400 | [diff] [blame] | 5723 | sinfo->active_objs = nr_objs - nr_free; |
| 5724 | sinfo->num_objs = nr_objs; |
| 5725 | sinfo->active_slabs = nr_slabs; |
| 5726 | sinfo->num_slabs = nr_slabs; |
| 5727 | sinfo->objects_per_slab = oo_objects(s->oo); |
| 5728 | sinfo->cache_order = oo_order(s->oo); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5729 | } |
| 5730 | |
Glauber Costa | 0d7561c | 2012-10-19 18:20:27 +0400 | [diff] [blame] | 5731 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s) |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5732 | { |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5733 | } |
| 5734 | |
Glauber Costa | b7454ad | 2012-10-19 18:20:25 +0400 | [diff] [blame] | 5735 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
| 5736 | size_t count, loff_t *ppos) |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5737 | { |
Glauber Costa | b7454ad | 2012-10-19 18:20:25 +0400 | [diff] [blame] | 5738 | return -EIO; |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5739 | } |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5740 | #endif /* CONFIG_SLABINFO */ |