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> |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 23 | #include <linux/kmemcheck.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 24 | #include <linux/cpu.h> |
| 25 | #include <linux/cpuset.h> |
| 26 | #include <linux/mempolicy.h> |
| 27 | #include <linux/ctype.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 28 | #include <linux/debugobjects.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 29 | #include <linux/kallsyms.h> |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 30 | #include <linux/memory.h> |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 31 | #include <linux/math64.h> |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 32 | #include <linux/fault-inject.h> |
Pekka Enberg | bfa7145 | 2011-07-07 22:47:01 +0300 | [diff] [blame] | 33 | #include <linux/stacktrace.h> |
Christoph Lameter | 4de900b | 2012-01-30 15:53:51 -0600 | [diff] [blame] | 34 | #include <linux/prefetch.h> |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 35 | #include <linux/memcontrol.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 36 | |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 37 | #include <trace/events/kmem.h> |
| 38 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 39 | #include "internal.h" |
| 40 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 41 | /* |
| 42 | * Lock order: |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 43 | * 1. slab_mutex (Global Mutex) |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 44 | * 2. node->list_lock |
| 45 | * 3. slab_lock(page) (Only on some arches and for debugging) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 46 | * |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 47 | * slab_mutex |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 48 | * |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 49 | * 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] | 50 | * and to synchronize major metadata changes to slab cache structures. |
| 51 | * |
| 52 | * The slab_lock is only used for debugging and on arches that do not |
| 53 | * have the ability to do a cmpxchg_double. It only protects the second |
| 54 | * double word in the page struct. Meaning |
| 55 | * A. page->freelist -> List of object free in a page |
| 56 | * B. page->counters -> Counters of objects |
| 57 | * C. page->frozen -> frozen state |
| 58 | * |
| 59 | * If a slab is frozen then it is exempt from list management. It is not |
| 60 | * on any list. The processor that froze the slab is the one who can |
| 61 | * perform list operations on the page. Other processors may put objects |
| 62 | * onto the freelist but the processor that froze the slab is the only |
| 63 | * one that can retrieve the objects from the page's freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 64 | * |
| 65 | * The list_lock protects the partial and full list on each node and |
| 66 | * the partial slab counter. If taken then no new slabs may be added or |
| 67 | * removed from the lists nor make the number of partial slabs be modified. |
| 68 | * (Note that the total number of slabs is an atomic value that may be |
| 69 | * modified without taking the list lock). |
| 70 | * |
| 71 | * The list_lock is a centralized lock and thus we avoid taking it as |
| 72 | * much as possible. As long as SLUB does not have to handle partial |
| 73 | * slabs, operations can continue without any centralized lock. F.e. |
| 74 | * allocating a long series of objects that fill up slabs does not require |
| 75 | * the list lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 76 | * Interrupts are disabled during allocation and deallocation in order to |
| 77 | * make the slab allocator safe to use in the context of an irq. In addition |
| 78 | * interrupts are disabled to ensure that the processor does not change |
| 79 | * while handling per_cpu slabs, due to kernel preemption. |
| 80 | * |
| 81 | * SLUB assigns one slab for allocation to each processor. |
| 82 | * Allocations only occur from these slabs called cpu slabs. |
| 83 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 84 | * Slabs with free elements are kept on a partial list and during regular |
| 85 | * 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] | 86 | * freed then the slab will show up again on the partial lists. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 87 | * We track full slabs for debugging purposes though because otherwise we |
| 88 | * cannot scan all objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 89 | * |
| 90 | * Slabs are freed when they become empty. Teardown and setup is |
| 91 | * minimal so we rely on the page allocators per cpu caches for |
| 92 | * fast frees and allocs. |
| 93 | * |
| 94 | * Overloading of page flags that are otherwise used for LRU management. |
| 95 | * |
Christoph Lameter | 4b6f075 | 2007-05-16 22:10:53 -0700 | [diff] [blame] | 96 | * PageActive The slab is frozen and exempt from list processing. |
| 97 | * This means that the slab is dedicated to a purpose |
| 98 | * such as satisfying allocations for a specific |
| 99 | * processor. Objects may be freed in the slab while |
| 100 | * it is frozen but slab_free will then skip the usual |
| 101 | * list operations. It is up to the processor holding |
| 102 | * the slab to integrate the slab into the slab lists |
| 103 | * when the slab is no longer needed. |
| 104 | * |
| 105 | * One use of this flag is to mark slabs that are |
| 106 | * used for allocations. Then such a slab becomes a cpu |
| 107 | * slab. The cpu slab may be equipped with an additional |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 108 | * freelist that allows lockless access to |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 109 | * free objects in addition to the regular freelist |
| 110 | * that requires the slab lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 111 | * |
| 112 | * PageError Slab requires special handling due to debug |
| 113 | * options set. This moves slab handling out of |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 114 | * the fast path and disables lockless freelists. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 115 | */ |
| 116 | |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 117 | static inline int kmem_cache_debug(struct kmem_cache *s) |
| 118 | { |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 119 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 120 | return unlikely(s->flags & SLAB_DEBUG_FLAGS); |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 121 | #else |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 122 | return 0; |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 123 | #endif |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 124 | } |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 125 | |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 126 | static inline bool kmem_cache_has_cpu_partial(struct kmem_cache *s) |
| 127 | { |
| 128 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
| 129 | return !kmem_cache_debug(s); |
| 130 | #else |
| 131 | return false; |
| 132 | #endif |
| 133 | } |
| 134 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 135 | /* |
| 136 | * Issues still to be resolved: |
| 137 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 138 | * - Support PAGE_ALLOC_DEBUG. Should be easy to do. |
| 139 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 140 | * - Variable sizing of the per node arrays |
| 141 | */ |
| 142 | |
| 143 | /* Enable to test recovery from slab corruption on boot */ |
| 144 | #undef SLUB_RESILIENCY_TEST |
| 145 | |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 146 | /* Enable to log cmpxchg failures */ |
| 147 | #undef SLUB_DEBUG_CMPXCHG |
| 148 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 149 | /* |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 150 | * Mininum number of partial slabs. These will be left on the partial |
| 151 | * lists even if they are empty. kmem_cache_shrink may reclaim them. |
| 152 | */ |
Christoph Lameter | 76be895 | 2007-12-21 14:37:37 -0800 | [diff] [blame] | 153 | #define MIN_PARTIAL 5 |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 154 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 155 | /* |
| 156 | * Maximum number of desirable partial slabs. |
| 157 | * The existence of more partial slabs makes kmem_cache_shrink |
Zhi Yong Wu | 721ae22 | 2013-11-08 20:47:37 +0800 | [diff] [blame^] | 158 | * sort the partial list by the number of objects in use. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 159 | */ |
| 160 | #define MAX_PARTIAL 10 |
| 161 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 162 | #define DEBUG_DEFAULT_FLAGS (SLAB_DEBUG_FREE | SLAB_RED_ZONE | \ |
| 163 | SLAB_POISON | SLAB_STORE_USER) |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 164 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 165 | /* |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 166 | * Debugging flags that require metadata to be stored in the slab. These get |
| 167 | * disabled when slub_debug=O is used and a cache's min order increases with |
| 168 | * metadata. |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 169 | */ |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 170 | #define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 171 | |
| 172 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 173 | * Set of flags that will prevent slab merging |
| 174 | */ |
| 175 | #define SLUB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 176 | SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE | \ |
| 177 | SLAB_FAILSLAB) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 178 | |
| 179 | #define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \ |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 180 | SLAB_CACHE_DMA | SLAB_NOTRACK) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 181 | |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 182 | #define OO_SHIFT 16 |
| 183 | #define OO_MASK ((1 << OO_SHIFT) - 1) |
Christoph Lameter | 50d5c41 | 2011-06-01 12:25:45 -0500 | [diff] [blame] | 184 | #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */ |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 185 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 186 | /* Internal SLUB flags */ |
Christoph Lameter | f90ec39 | 2010-07-09 14:07:11 -0500 | [diff] [blame] | 187 | #define __OBJECT_POISON 0x80000000UL /* Poison object */ |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 188 | #define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 189 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 190 | #ifdef CONFIG_SMP |
| 191 | static struct notifier_block slab_notifier; |
| 192 | #endif |
| 193 | |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 194 | /* |
| 195 | * Tracking user of a slab. |
| 196 | */ |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 197 | #define TRACK_ADDRS_COUNT 16 |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 198 | struct track { |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 199 | unsigned long addr; /* Called from address */ |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 200 | #ifdef CONFIG_STACKTRACE |
| 201 | unsigned long addrs[TRACK_ADDRS_COUNT]; /* Called from address */ |
| 202 | #endif |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 203 | int cpu; /* Was running on cpu */ |
| 204 | int pid; /* Pid context */ |
| 205 | unsigned long when; /* When did the operation occur */ |
| 206 | }; |
| 207 | |
| 208 | enum track_item { TRACK_ALLOC, TRACK_FREE }; |
| 209 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 210 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 211 | static int sysfs_slab_add(struct kmem_cache *); |
| 212 | static int sysfs_slab_alias(struct kmem_cache *, const char *); |
| 213 | static void sysfs_slab_remove(struct kmem_cache *); |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 214 | static void memcg_propagate_slab_attrs(struct kmem_cache *s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 215 | #else |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 216 | static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } |
| 217 | static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) |
| 218 | { return 0; } |
Christoph Lameter | db265ec | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 219 | static inline void sysfs_slab_remove(struct kmem_cache *s) { } |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 220 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 221 | static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 222 | #endif |
| 223 | |
Christoph Lameter | 4fdccdf | 2011-03-22 13:35:00 -0500 | [diff] [blame] | 224 | 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] | 225 | { |
| 226 | #ifdef CONFIG_SLUB_STATS |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 227 | __this_cpu_inc(s->cpu_slab->stat[si]); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 228 | #endif |
| 229 | } |
| 230 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 231 | /******************************************************************** |
| 232 | * Core slab cache functions |
| 233 | *******************************************************************/ |
| 234 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 235 | static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) |
| 236 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 237 | return s->node[node]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 238 | } |
| 239 | |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 240 | /* Verify that a pointer has an address that is valid within a slab page */ |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 241 | static inline int check_valid_pointer(struct kmem_cache *s, |
| 242 | struct page *page, const void *object) |
| 243 | { |
| 244 | void *base; |
| 245 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 246 | if (!object) |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 247 | return 1; |
| 248 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 249 | base = page_address(page); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 250 | if (object < base || object >= base + page->objects * s->size || |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 251 | (object - base) % s->size) { |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | return 1; |
| 256 | } |
| 257 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 258 | static inline void *get_freepointer(struct kmem_cache *s, void *object) |
| 259 | { |
| 260 | return *(void **)(object + s->offset); |
| 261 | } |
| 262 | |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 263 | static void prefetch_freepointer(const struct kmem_cache *s, void *object) |
| 264 | { |
| 265 | prefetch(object + s->offset); |
| 266 | } |
| 267 | |
Christoph Lameter | 1393d9a | 2011-05-16 15:26:08 -0500 | [diff] [blame] | 268 | static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) |
| 269 | { |
| 270 | void *p; |
| 271 | |
| 272 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 273 | probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p)); |
| 274 | #else |
| 275 | p = get_freepointer(s, object); |
| 276 | #endif |
| 277 | return p; |
| 278 | } |
| 279 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 280 | static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) |
| 281 | { |
| 282 | *(void **)(object + s->offset) = fp; |
| 283 | } |
| 284 | |
| 285 | /* Loop over all objects in a slab */ |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 286 | #define for_each_object(__p, __s, __addr, __objects) \ |
| 287 | for (__p = (__addr); __p < (__addr) + (__objects) * (__s)->size;\ |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 288 | __p += (__s)->size) |
| 289 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 290 | /* Determine object index from a given position */ |
| 291 | static inline int slab_index(void *p, struct kmem_cache *s, void *addr) |
| 292 | { |
| 293 | return (p - addr) / s->size; |
| 294 | } |
| 295 | |
Mariusz Kozlowski | d71f606 | 2011-02-26 20:10:26 +0100 | [diff] [blame] | 296 | static inline size_t slab_ksize(const struct kmem_cache *s) |
| 297 | { |
| 298 | #ifdef CONFIG_SLUB_DEBUG |
| 299 | /* |
| 300 | * Debugging requires use of the padding between object |
| 301 | * and whatever may come after it. |
| 302 | */ |
| 303 | if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 304 | return s->object_size; |
Mariusz Kozlowski | d71f606 | 2011-02-26 20:10:26 +0100 | [diff] [blame] | 305 | |
| 306 | #endif |
| 307 | /* |
| 308 | * If we have the need to store the freelist pointer |
| 309 | * back there or track user information then we can |
| 310 | * only use the space before that information. |
| 311 | */ |
| 312 | if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER)) |
| 313 | return s->inuse; |
| 314 | /* |
| 315 | * Else we can use all the padding etc for the allocation |
| 316 | */ |
| 317 | return s->size; |
| 318 | } |
| 319 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 320 | static inline int order_objects(int order, unsigned long size, int reserved) |
| 321 | { |
| 322 | return ((PAGE_SIZE << order) - reserved) / size; |
| 323 | } |
| 324 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 325 | static inline struct kmem_cache_order_objects oo_make(int order, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 326 | unsigned long size, int reserved) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 327 | { |
| 328 | struct kmem_cache_order_objects x = { |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 329 | (order << OO_SHIFT) + order_objects(order, size, reserved) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 330 | }; |
| 331 | |
| 332 | return x; |
| 333 | } |
| 334 | |
| 335 | static inline int oo_order(struct kmem_cache_order_objects x) |
| 336 | { |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 337 | return x.x >> OO_SHIFT; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static inline int oo_objects(struct kmem_cache_order_objects x) |
| 341 | { |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 342 | return x.x & OO_MASK; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 343 | } |
| 344 | |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 345 | /* |
| 346 | * Per slab locking using the pagelock |
| 347 | */ |
| 348 | static __always_inline void slab_lock(struct page *page) |
| 349 | { |
| 350 | bit_spin_lock(PG_locked, &page->flags); |
| 351 | } |
| 352 | |
| 353 | static __always_inline void slab_unlock(struct page *page) |
| 354 | { |
| 355 | __bit_spin_unlock(PG_locked, &page->flags); |
| 356 | } |
| 357 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 358 | /* Interrupts must be disabled (for the fallback code to work right) */ |
| 359 | 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] | 360 | void *freelist_old, unsigned long counters_old, |
| 361 | void *freelist_new, unsigned long counters_new, |
| 362 | const char *n) |
| 363 | { |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 364 | VM_BUG_ON(!irqs_disabled()); |
Heiko Carstens | 2565409 | 2012-01-12 17:17:33 -0800 | [diff] [blame] | 365 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
| 366 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 367 | if (s->flags & __CMPXCHG_DOUBLE) { |
Jan Beulich | cdcd629 | 2012-01-02 17:02:18 +0000 | [diff] [blame] | 368 | if (cmpxchg_double(&page->freelist, &page->counters, |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 369 | freelist_old, counters_old, |
| 370 | freelist_new, counters_new)) |
| 371 | return 1; |
| 372 | } else |
| 373 | #endif |
| 374 | { |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 375 | slab_lock(page); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 376 | if (page->freelist == freelist_old && page->counters == counters_old) { |
| 377 | page->freelist = freelist_new; |
| 378 | page->counters = counters_new; |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 379 | slab_unlock(page); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 380 | return 1; |
| 381 | } |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 382 | slab_unlock(page); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | cpu_relax(); |
| 386 | stat(s, CMPXCHG_DOUBLE_FAIL); |
| 387 | |
| 388 | #ifdef SLUB_DEBUG_CMPXCHG |
| 389 | printk(KERN_INFO "%s %s: cmpxchg double redo ", n, s->name); |
| 390 | #endif |
| 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 395 | static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
| 396 | void *freelist_old, unsigned long counters_old, |
| 397 | void *freelist_new, unsigned long counters_new, |
| 398 | const char *n) |
| 399 | { |
Heiko Carstens | 2565409 | 2012-01-12 17:17:33 -0800 | [diff] [blame] | 400 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
| 401 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 402 | if (s->flags & __CMPXCHG_DOUBLE) { |
Jan Beulich | cdcd629 | 2012-01-02 17:02:18 +0000 | [diff] [blame] | 403 | if (cmpxchg_double(&page->freelist, &page->counters, |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 404 | freelist_old, counters_old, |
| 405 | freelist_new, counters_new)) |
| 406 | return 1; |
| 407 | } else |
| 408 | #endif |
| 409 | { |
| 410 | unsigned long flags; |
| 411 | |
| 412 | local_irq_save(flags); |
| 413 | slab_lock(page); |
| 414 | if (page->freelist == freelist_old && page->counters == counters_old) { |
| 415 | page->freelist = freelist_new; |
| 416 | page->counters = counters_new; |
| 417 | slab_unlock(page); |
| 418 | local_irq_restore(flags); |
| 419 | return 1; |
| 420 | } |
| 421 | slab_unlock(page); |
| 422 | local_irq_restore(flags); |
| 423 | } |
| 424 | |
| 425 | cpu_relax(); |
| 426 | stat(s, CMPXCHG_DOUBLE_FAIL); |
| 427 | |
| 428 | #ifdef SLUB_DEBUG_CMPXCHG |
| 429 | printk(KERN_INFO "%s %s: cmpxchg double redo ", n, s->name); |
| 430 | #endif |
| 431 | |
| 432 | return 0; |
| 433 | } |
| 434 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 435 | #ifdef CONFIG_SLUB_DEBUG |
| 436 | /* |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 437 | * Determine a map of object in use on a page. |
| 438 | * |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 439 | * Node listlock must be held to guarantee that the page does |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 440 | * not vanish from under us. |
| 441 | */ |
| 442 | static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map) |
| 443 | { |
| 444 | void *p; |
| 445 | void *addr = page_address(page); |
| 446 | |
| 447 | for (p = page->freelist; p; p = get_freepointer(s, p)) |
| 448 | set_bit(slab_index(p, s, addr), map); |
| 449 | } |
| 450 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 451 | /* |
| 452 | * Debug settings: |
| 453 | */ |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 454 | #ifdef CONFIG_SLUB_DEBUG_ON |
| 455 | static int slub_debug = DEBUG_DEFAULT_FLAGS; |
| 456 | #else |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 457 | static int slub_debug; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 458 | #endif |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 459 | |
| 460 | static char *slub_debug_slabs; |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 461 | static int disable_higher_order_debug; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 462 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 463 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 464 | * Object debugging |
| 465 | */ |
| 466 | static void print_section(char *text, u8 *addr, unsigned int length) |
| 467 | { |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 468 | print_hex_dump(KERN_ERR, text, DUMP_PREFIX_ADDRESS, 16, 1, addr, |
| 469 | length, 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 470 | } |
| 471 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 472 | static struct track *get_track(struct kmem_cache *s, void *object, |
| 473 | enum track_item alloc) |
| 474 | { |
| 475 | struct track *p; |
| 476 | |
| 477 | if (s->offset) |
| 478 | p = object + s->offset + sizeof(void *); |
| 479 | else |
| 480 | p = object + s->inuse; |
| 481 | |
| 482 | return p + alloc; |
| 483 | } |
| 484 | |
| 485 | static void set_track(struct kmem_cache *s, void *object, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 486 | enum track_item alloc, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 487 | { |
Akinobu Mita | 1a00df4 | 2009-03-07 00:36:21 +0900 | [diff] [blame] | 488 | struct track *p = get_track(s, object, alloc); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 489 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 490 | if (addr) { |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 491 | #ifdef CONFIG_STACKTRACE |
| 492 | struct stack_trace trace; |
| 493 | int i; |
| 494 | |
| 495 | trace.nr_entries = 0; |
| 496 | trace.max_entries = TRACK_ADDRS_COUNT; |
| 497 | trace.entries = p->addrs; |
| 498 | trace.skip = 3; |
| 499 | save_stack_trace(&trace); |
| 500 | |
| 501 | /* See rant in lockdep.c */ |
| 502 | if (trace.nr_entries != 0 && |
| 503 | trace.entries[trace.nr_entries - 1] == ULONG_MAX) |
| 504 | trace.nr_entries--; |
| 505 | |
| 506 | for (i = trace.nr_entries; i < TRACK_ADDRS_COUNT; i++) |
| 507 | p->addrs[i] = 0; |
| 508 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 509 | p->addr = addr; |
| 510 | p->cpu = smp_processor_id(); |
Alexey Dobriyan | 88e4ccf | 2008-06-23 02:58:37 +0400 | [diff] [blame] | 511 | p->pid = current->pid; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 512 | p->when = jiffies; |
| 513 | } else |
| 514 | memset(p, 0, sizeof(struct track)); |
| 515 | } |
| 516 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 517 | static void init_tracking(struct kmem_cache *s, void *object) |
| 518 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 519 | if (!(s->flags & SLAB_STORE_USER)) |
| 520 | return; |
| 521 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 522 | set_track(s, object, TRACK_FREE, 0UL); |
| 523 | set_track(s, object, TRACK_ALLOC, 0UL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | static void print_track(const char *s, struct track *t) |
| 527 | { |
| 528 | if (!t->addr) |
| 529 | return; |
| 530 | |
Linus Torvalds | 7daf705 | 2008-07-14 12:12:53 -0700 | [diff] [blame] | 531 | printk(KERN_ERR "INFO: %s in %pS age=%lu cpu=%u pid=%d\n", |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 532 | s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); |
Ben Greear | d6543e3 | 2011-07-07 11:36:36 -0700 | [diff] [blame] | 533 | #ifdef CONFIG_STACKTRACE |
| 534 | { |
| 535 | int i; |
| 536 | for (i = 0; i < TRACK_ADDRS_COUNT; i++) |
| 537 | if (t->addrs[i]) |
| 538 | printk(KERN_ERR "\t%pS\n", (void *)t->addrs[i]); |
| 539 | else |
| 540 | break; |
| 541 | } |
| 542 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 543 | } |
| 544 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 545 | static void print_tracking(struct kmem_cache *s, void *object) |
| 546 | { |
| 547 | if (!(s->flags & SLAB_STORE_USER)) |
| 548 | return; |
| 549 | |
| 550 | print_track("Allocated", get_track(s, object, TRACK_ALLOC)); |
| 551 | print_track("Freed", get_track(s, object, TRACK_FREE)); |
| 552 | } |
| 553 | |
| 554 | static void print_page_info(struct page *page) |
| 555 | { |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 556 | printk(KERN_ERR "INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n", |
| 557 | page, page->objects, page->inuse, page->freelist, page->flags); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 558 | |
| 559 | } |
| 560 | |
| 561 | static void slab_bug(struct kmem_cache *s, char *fmt, ...) |
| 562 | { |
| 563 | va_list args; |
| 564 | char buf[100]; |
| 565 | |
| 566 | va_start(args, fmt); |
| 567 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 568 | va_end(args); |
| 569 | printk(KERN_ERR "========================================" |
| 570 | "=====================================\n"); |
Dave Jones | 265d47e | 2011-11-15 15:04:00 -0800 | [diff] [blame] | 571 | printk(KERN_ERR "BUG %s (%s): %s\n", s->name, print_tainted(), buf); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 572 | printk(KERN_ERR "----------------------------------------" |
| 573 | "-------------------------------------\n\n"); |
Dave Jones | 645df23 | 2012-09-18 15:54:12 -0400 | [diff] [blame] | 574 | |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 575 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | static void slab_fix(struct kmem_cache *s, char *fmt, ...) |
| 579 | { |
| 580 | va_list args; |
| 581 | char buf[100]; |
| 582 | |
| 583 | va_start(args, fmt); |
| 584 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 585 | va_end(args); |
| 586 | printk(KERN_ERR "FIX %s: %s\n", s->name, buf); |
| 587 | } |
| 588 | |
| 589 | 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] | 590 | { |
| 591 | unsigned int off; /* Offset of last byte */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 592 | u8 *addr = page_address(page); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 593 | |
| 594 | print_tracking(s, p); |
| 595 | |
| 596 | print_page_info(page); |
| 597 | |
| 598 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu fp=0x%p\n\n", |
| 599 | p, p - addr, get_freepointer(s, p)); |
| 600 | |
| 601 | if (p > addr + 16) |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 602 | print_section("Bytes b4 ", p - 16, 16); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 603 | |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 604 | print_section("Object ", p, min_t(unsigned long, s->object_size, |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 605 | PAGE_SIZE)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 606 | if (s->flags & SLAB_RED_ZONE) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 607 | print_section("Redzone ", p + s->object_size, |
| 608 | s->inuse - s->object_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 609 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 610 | if (s->offset) |
| 611 | off = s->offset + sizeof(void *); |
| 612 | else |
| 613 | off = s->inuse; |
| 614 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 615 | if (s->flags & SLAB_STORE_USER) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 616 | off += 2 * sizeof(struct track); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 617 | |
| 618 | if (off != s->size) |
| 619 | /* Beginning of the filler is the free pointer */ |
Sebastian Andrzej Siewior | ffc79d2 | 2011-07-29 14:10:20 +0200 | [diff] [blame] | 620 | print_section("Padding ", p + off, s->size - off); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 621 | |
| 622 | dump_stack(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 623 | } |
| 624 | |
| 625 | static void object_err(struct kmem_cache *s, struct page *page, |
| 626 | u8 *object, char *reason) |
| 627 | { |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 628 | slab_bug(s, "%s", reason); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 629 | print_trailer(s, page, object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 630 | } |
| 631 | |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 632 | static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 633 | { |
| 634 | va_list args; |
| 635 | char buf[100]; |
| 636 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 637 | va_start(args, fmt); |
| 638 | vsnprintf(buf, sizeof(buf), fmt, args); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 639 | va_end(args); |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 640 | slab_bug(s, "%s", buf); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 641 | print_page_info(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 642 | dump_stack(); |
| 643 | } |
| 644 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 645 | static void init_object(struct kmem_cache *s, void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 646 | { |
| 647 | u8 *p = object; |
| 648 | |
| 649 | if (s->flags & __OBJECT_POISON) { |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 650 | memset(p, POISON_FREE, s->object_size - 1); |
| 651 | p[s->object_size - 1] = POISON_END; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | if (s->flags & SLAB_RED_ZONE) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 655 | memset(p + s->object_size, val, s->inuse - s->object_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 656 | } |
| 657 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 658 | static void restore_bytes(struct kmem_cache *s, char *message, u8 data, |
| 659 | void *from, void *to) |
| 660 | { |
| 661 | slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data); |
| 662 | memset(from, data, to - from); |
| 663 | } |
| 664 | |
| 665 | static int check_bytes_and_report(struct kmem_cache *s, struct page *page, |
| 666 | u8 *object, char *what, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 667 | u8 *start, unsigned int value, unsigned int bytes) |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 668 | { |
| 669 | u8 *fault; |
| 670 | u8 *end; |
| 671 | |
Akinobu Mita | 79824820 | 2011-10-31 17:08:07 -0700 | [diff] [blame] | 672 | fault = memchr_inv(start, value, bytes); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 673 | if (!fault) |
| 674 | return 1; |
| 675 | |
| 676 | end = start + bytes; |
| 677 | while (end > fault && end[-1] == value) |
| 678 | end--; |
| 679 | |
| 680 | slab_bug(s, "%s overwritten", what); |
| 681 | printk(KERN_ERR "INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n", |
| 682 | fault, end - 1, fault[0], value); |
| 683 | print_trailer(s, page, object); |
| 684 | |
| 685 | restore_bytes(s, what, value, fault, end); |
| 686 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 689 | /* |
| 690 | * Object layout: |
| 691 | * |
| 692 | * object address |
| 693 | * Bytes of the object to be managed. |
| 694 | * If the freepointer may overlay the object then the free |
| 695 | * pointer is the first word of the object. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 696 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 697 | * Poisoning uses 0x6b (POISON_FREE) and the last byte is |
| 698 | * 0xa5 (POISON_END) |
| 699 | * |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 700 | * object + s->object_size |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 701 | * Padding to reach word boundary. This is also used for Redzoning. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 702 | * Padding is extended by another word if Redzoning is enabled and |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 703 | * object_size == inuse. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 704 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 705 | * We fill with 0xbb (RED_INACTIVE) for inactive objects and with |
| 706 | * 0xcc (RED_ACTIVE) for objects in use. |
| 707 | * |
| 708 | * object + s->inuse |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 709 | * Meta data starts here. |
| 710 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 711 | * A. Free pointer (if we cannot overwrite object on free) |
| 712 | * B. Tracking data for SLAB_STORE_USER |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 713 | * C. Padding to reach required alignment boundary or at mininum |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 714 | * one word if debugging is on to be able to detect writes |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 715 | * before the word boundary. |
| 716 | * |
| 717 | * Padding is done using 0x5a (POISON_INUSE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 718 | * |
| 719 | * object + s->size |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 720 | * Nothing is used beyond s->size. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 721 | * |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 722 | * 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] | 723 | * ignored. And therefore no slab options that rely on these boundaries |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 724 | * may be used with merged slabcaches. |
| 725 | */ |
| 726 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 727 | static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) |
| 728 | { |
| 729 | unsigned long off = s->inuse; /* The end of info */ |
| 730 | |
| 731 | if (s->offset) |
| 732 | /* Freepointer is placed after the object. */ |
| 733 | off += sizeof(void *); |
| 734 | |
| 735 | if (s->flags & SLAB_STORE_USER) |
| 736 | /* We also have user information there */ |
| 737 | off += 2 * sizeof(struct track); |
| 738 | |
| 739 | if (s->size == off) |
| 740 | return 1; |
| 741 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 742 | return check_bytes_and_report(s, page, p, "Object padding", |
| 743 | p + off, POISON_INUSE, s->size - off); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 744 | } |
| 745 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 746 | /* Check the pad bytes at the end of a slab page */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 747 | static int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 748 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 749 | u8 *start; |
| 750 | u8 *fault; |
| 751 | u8 *end; |
| 752 | int length; |
| 753 | int remainder; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 754 | |
| 755 | if (!(s->flags & SLAB_POISON)) |
| 756 | return 1; |
| 757 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 758 | start = page_address(page); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 759 | length = (PAGE_SIZE << compound_order(page)) - s->reserved; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 760 | end = start + length; |
| 761 | remainder = length % s->size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 762 | if (!remainder) |
| 763 | return 1; |
| 764 | |
Akinobu Mita | 79824820 | 2011-10-31 17:08:07 -0700 | [diff] [blame] | 765 | fault = memchr_inv(end - remainder, POISON_INUSE, remainder); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 766 | if (!fault) |
| 767 | return 1; |
| 768 | while (end > fault && end[-1] == POISON_INUSE) |
| 769 | end--; |
| 770 | |
| 771 | 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] | 772 | print_section("Padding ", end - remainder, remainder); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 773 | |
Eric Dumazet | 8a3d271 | 2009-09-03 16:08:06 +0200 | [diff] [blame] | 774 | restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 775 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 776 | } |
| 777 | |
| 778 | static int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 779 | void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 780 | { |
| 781 | u8 *p = object; |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 782 | u8 *endobject = object + s->object_size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 783 | |
| 784 | if (s->flags & SLAB_RED_ZONE) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 785 | if (!check_bytes_and_report(s, page, object, "Redzone", |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 786 | endobject, val, s->inuse - s->object_size)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 787 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 788 | } else { |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 789 | if ((s->flags & SLAB_POISON) && s->object_size < s->inuse) { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 790 | check_bytes_and_report(s, page, p, "Alignment padding", |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 791 | endobject, POISON_INUSE, s->inuse - s->object_size); |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 792 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 793 | } |
| 794 | |
| 795 | if (s->flags & SLAB_POISON) { |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 796 | if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) && |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 797 | (!check_bytes_and_report(s, page, p, "Poison", p, |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 798 | POISON_FREE, s->object_size - 1) || |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 799 | !check_bytes_and_report(s, page, p, "Poison", |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 800 | p + s->object_size - 1, POISON_END, 1))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 801 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 802 | /* |
| 803 | * check_pad_bytes cleans up on its own. |
| 804 | */ |
| 805 | check_pad_bytes(s, page, p); |
| 806 | } |
| 807 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 808 | if (!s->offset && val == SLUB_RED_ACTIVE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 809 | /* |
| 810 | * Object and freepointer overlap. Cannot check |
| 811 | * freepointer while object is allocated. |
| 812 | */ |
| 813 | return 1; |
| 814 | |
| 815 | /* Check free pointer validity */ |
| 816 | if (!check_valid_pointer(s, page, get_freepointer(s, p))) { |
| 817 | object_err(s, page, p, "Freepointer corrupt"); |
| 818 | /* |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 819 | * No choice but to zap it and thus lose the remainder |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 820 | * of the free objects in this slab. May cause |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 821 | * another error because the object count is now wrong. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 822 | */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 823 | set_freepointer(s, p, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 824 | return 0; |
| 825 | } |
| 826 | return 1; |
| 827 | } |
| 828 | |
| 829 | static int check_slab(struct kmem_cache *s, struct page *page) |
| 830 | { |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 831 | int maxobj; |
| 832 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 833 | VM_BUG_ON(!irqs_disabled()); |
| 834 | |
| 835 | if (!PageSlab(page)) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 836 | slab_err(s, page, "Not a valid slab page"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 837 | return 0; |
| 838 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 839 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 840 | maxobj = order_objects(compound_order(page), s->size, s->reserved); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 841 | if (page->objects > maxobj) { |
| 842 | slab_err(s, page, "objects %u > max %u", |
| 843 | s->name, page->objects, maxobj); |
| 844 | return 0; |
| 845 | } |
| 846 | if (page->inuse > page->objects) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 847 | slab_err(s, page, "inuse %u > max %u", |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 848 | s->name, page->inuse, page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 849 | return 0; |
| 850 | } |
| 851 | /* Slab_pad_check fixes things up after itself */ |
| 852 | slab_pad_check(s, page); |
| 853 | return 1; |
| 854 | } |
| 855 | |
| 856 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 857 | * Determine if a certain object on a page is on the freelist. Must hold the |
| 858 | * slab lock to guarantee that the chains are in a consistent state. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 859 | */ |
| 860 | static int on_freelist(struct kmem_cache *s, struct page *page, void *search) |
| 861 | { |
| 862 | int nr = 0; |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 863 | void *fp; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 864 | void *object = NULL; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 865 | unsigned long max_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 866 | |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 867 | fp = page->freelist; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 868 | while (fp && nr <= page->objects) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 869 | if (fp == search) |
| 870 | return 1; |
| 871 | if (!check_valid_pointer(s, page, fp)) { |
| 872 | if (object) { |
| 873 | object_err(s, page, object, |
| 874 | "Freechain corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 875 | set_freepointer(s, object, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 876 | break; |
| 877 | } else { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 878 | slab_err(s, page, "Freepointer corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 879 | page->freelist = NULL; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 880 | page->inuse = page->objects; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 881 | slab_fix(s, "Freelist cleared"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 882 | return 0; |
| 883 | } |
| 884 | break; |
| 885 | } |
| 886 | object = fp; |
| 887 | fp = get_freepointer(s, object); |
| 888 | nr++; |
| 889 | } |
| 890 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 891 | max_objects = order_objects(compound_order(page), s->size, s->reserved); |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 892 | if (max_objects > MAX_OBJS_PER_PAGE) |
| 893 | max_objects = MAX_OBJS_PER_PAGE; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 894 | |
| 895 | if (page->objects != max_objects) { |
| 896 | slab_err(s, page, "Wrong number of objects. Found %d but " |
| 897 | "should be %d", page->objects, max_objects); |
| 898 | page->objects = max_objects; |
| 899 | slab_fix(s, "Number of objects adjusted."); |
| 900 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 901 | if (page->inuse != page->objects - nr) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 902 | slab_err(s, page, "Wrong object count. Counter is %d but " |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 903 | "counted were %d", page->inuse, page->objects - nr); |
| 904 | page->inuse = page->objects - nr; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 905 | slab_fix(s, "Object count adjusted."); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 906 | } |
| 907 | return search == NULL; |
| 908 | } |
| 909 | |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 910 | static void trace(struct kmem_cache *s, struct page *page, void *object, |
| 911 | int alloc) |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 912 | { |
| 913 | if (s->flags & SLAB_TRACE) { |
| 914 | printk(KERN_INFO "TRACE %s %s 0x%p inuse=%d fp=0x%p\n", |
| 915 | s->name, |
| 916 | alloc ? "alloc" : "free", |
| 917 | object, page->inuse, |
| 918 | page->freelist); |
| 919 | |
| 920 | if (!alloc) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 921 | print_section("Object ", (void *)object, s->object_size); |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 922 | |
| 923 | dump_stack(); |
| 924 | } |
| 925 | } |
| 926 | |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 927 | /* |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 928 | * Hooks for other subsystems that check memory allocations. In a typical |
| 929 | * production configuration these hooks all should produce no code at all. |
| 930 | */ |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 931 | static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) |
| 932 | { |
| 933 | kmemleak_alloc(ptr, size, 1, flags); |
| 934 | } |
| 935 | |
| 936 | static inline void kfree_hook(const void *x) |
| 937 | { |
| 938 | kmemleak_free(x); |
| 939 | } |
| 940 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 941 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) |
| 942 | { |
Christoph Lameter | c1d5083 | 2010-08-20 12:37:17 -0500 | [diff] [blame] | 943 | flags &= gfp_allowed_mask; |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 944 | lockdep_trace_alloc(flags); |
| 945 | might_sleep_if(flags & __GFP_WAIT); |
| 946 | |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 947 | return should_failslab(s->object_size, flags, s->flags); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, void *object) |
| 951 | { |
Christoph Lameter | c1d5083 | 2010-08-20 12:37:17 -0500 | [diff] [blame] | 952 | flags &= gfp_allowed_mask; |
Eric Dumazet | b3d4188 | 2011-02-14 18:35:22 +0100 | [diff] [blame] | 953 | kmemcheck_slab_alloc(s, flags, object, slab_ksize(s)); |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 954 | kmemleak_alloc_recursive(object, s->object_size, 1, s->flags, flags); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 955 | } |
| 956 | |
| 957 | static inline void slab_free_hook(struct kmem_cache *s, void *x) |
| 958 | { |
| 959 | kmemleak_free_recursive(x, s->flags); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 960 | |
Christoph Lameter | d3f661d | 2011-02-25 11:38:52 -0600 | [diff] [blame] | 961 | /* |
| 962 | * Trouble is that we may no longer disable interupts in the fast path |
| 963 | * So in order to make the debug calls that expect irqs to be |
| 964 | * disabled we need to disable interrupts temporarily. |
| 965 | */ |
| 966 | #if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP) |
| 967 | { |
| 968 | unsigned long flags; |
| 969 | |
| 970 | local_irq_save(flags); |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 971 | kmemcheck_slab_free(s, x, s->object_size); |
| 972 | debug_check_no_locks_freed(x, s->object_size); |
Christoph Lameter | d3f661d | 2011-02-25 11:38:52 -0600 | [diff] [blame] | 973 | local_irq_restore(flags); |
| 974 | } |
| 975 | #endif |
Thomas Gleixner | f9b615d | 2011-03-24 21:26:46 +0200 | [diff] [blame] | 976 | if (!(s->flags & SLAB_DEBUG_OBJECTS)) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 977 | debug_check_no_obj_freed(x, s->object_size); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 978 | } |
| 979 | |
| 980 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 981 | * Tracking of fully allocated slabs for debugging purposes. |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 982 | * |
| 983 | * list_lock must be held. |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 984 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 985 | static void add_full(struct kmem_cache *s, |
| 986 | struct kmem_cache_node *n, struct page *page) |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 987 | { |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 988 | if (!(s->flags & SLAB_STORE_USER)) |
| 989 | return; |
| 990 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 991 | list_add(&page->lru, &n->full); |
| 992 | } |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 993 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 994 | /* |
| 995 | * list_lock must be held. |
| 996 | */ |
| 997 | static void remove_full(struct kmem_cache *s, struct page *page) |
| 998 | { |
| 999 | if (!(s->flags & SLAB_STORE_USER)) |
| 1000 | return; |
| 1001 | |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 1002 | list_del(&page->lru); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 1003 | } |
| 1004 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1005 | /* Tracking of the number of slabs for debugging purposes */ |
| 1006 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 1007 | { |
| 1008 | struct kmem_cache_node *n = get_node(s, node); |
| 1009 | |
| 1010 | return atomic_long_read(&n->nr_slabs); |
| 1011 | } |
| 1012 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1013 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 1014 | { |
| 1015 | return atomic_long_read(&n->nr_slabs); |
| 1016 | } |
| 1017 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1018 | 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] | 1019 | { |
| 1020 | struct kmem_cache_node *n = get_node(s, node); |
| 1021 | |
| 1022 | /* |
| 1023 | * May be called early in order to allocate a slab for the |
| 1024 | * kmem_cache_node structure. Solve the chicken-egg |
| 1025 | * dilemma by deferring the increment of the count during |
| 1026 | * bootstrap (see early_kmem_cache_node_alloc). |
| 1027 | */ |
Joonsoo Kim | 338b264 | 2013-01-21 17:01:27 +0900 | [diff] [blame] | 1028 | if (likely(n)) { |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1029 | atomic_long_inc(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1030 | atomic_long_add(objects, &n->total_objects); |
| 1031 | } |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1032 | } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1033 | 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] | 1034 | { |
| 1035 | struct kmem_cache_node *n = get_node(s, node); |
| 1036 | |
| 1037 | atomic_long_dec(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1038 | atomic_long_sub(objects, &n->total_objects); |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | /* Object debug checks for alloc/free paths */ |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1042 | static void setup_object_debug(struct kmem_cache *s, struct page *page, |
| 1043 | void *object) |
| 1044 | { |
| 1045 | if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON))) |
| 1046 | return; |
| 1047 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1048 | init_object(s, object, SLUB_RED_INACTIVE); |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1049 | init_tracking(s, object); |
| 1050 | } |
| 1051 | |
Christoph Lameter | 1537066 | 2010-08-20 12:37:12 -0500 | [diff] [blame] | 1052 | static noinline int alloc_debug_processing(struct kmem_cache *s, struct page *page, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1053 | void *object, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1054 | { |
| 1055 | if (!check_slab(s, page)) |
| 1056 | goto bad; |
| 1057 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1058 | if (!check_valid_pointer(s, page, object)) { |
| 1059 | object_err(s, page, object, "Freelist Pointer check fails"); |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1060 | goto bad; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1061 | } |
| 1062 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1063 | if (!check_object(s, page, object, SLUB_RED_INACTIVE)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1064 | goto bad; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1065 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1066 | /* Success perform special debug activities for allocs */ |
| 1067 | if (s->flags & SLAB_STORE_USER) |
| 1068 | set_track(s, object, TRACK_ALLOC, addr); |
| 1069 | trace(s, page, object, 1); |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1070 | init_object(s, object, SLUB_RED_ACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1071 | return 1; |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1072 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1073 | bad: |
| 1074 | if (PageSlab(page)) { |
| 1075 | /* |
| 1076 | * If this is a slab page then lets do the best we can |
| 1077 | * to avoid issues in the future. Marking all objects |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1078 | * as used avoids touching the remaining objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1079 | */ |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1080 | slab_fix(s, "Marking all objects used"); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 1081 | page->inuse = page->objects; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1082 | page->freelist = NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1083 | } |
| 1084 | return 0; |
| 1085 | } |
| 1086 | |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1087 | static noinline struct kmem_cache_node *free_debug_processing( |
| 1088 | struct kmem_cache *s, struct page *page, void *object, |
| 1089 | unsigned long addr, unsigned long *flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1090 | { |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1091 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1092 | |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1093 | spin_lock_irqsave(&n->list_lock, *flags); |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1094 | slab_lock(page); |
| 1095 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1096 | if (!check_slab(s, page)) |
| 1097 | goto fail; |
| 1098 | |
| 1099 | if (!check_valid_pointer(s, page, object)) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1100 | slab_err(s, page, "Invalid object pointer 0x%p", object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1101 | goto fail; |
| 1102 | } |
| 1103 | |
| 1104 | if (on_freelist(s, page, object)) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1105 | object_err(s, page, object, "Object already free"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1106 | goto fail; |
| 1107 | } |
| 1108 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1109 | if (!check_object(s, page, object, SLUB_RED_ACTIVE)) |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1110 | goto out; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1111 | |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 1112 | if (unlikely(s != page->slab_cache)) { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 1113 | if (!PageSlab(page)) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1114 | slab_err(s, page, "Attempt to free object(0x%p) " |
| 1115 | "outside of slab", object); |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 1116 | } else if (!page->slab_cache) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1117 | printk(KERN_ERR |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1118 | "SLUB <none>: no slab for object 0x%p.\n", |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1119 | object); |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1120 | dump_stack(); |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1121 | } else |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1122 | object_err(s, page, object, |
| 1123 | "page slab pointer corrupt."); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1124 | goto fail; |
| 1125 | } |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1126 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1127 | if (s->flags & SLAB_STORE_USER) |
| 1128 | set_track(s, object, TRACK_FREE, addr); |
| 1129 | trace(s, page, object, 0); |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1130 | init_object(s, object, SLUB_RED_INACTIVE); |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1131 | out: |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1132 | slab_unlock(page); |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1133 | /* |
| 1134 | * Keep node_lock to preserve integrity |
| 1135 | * until the object is actually freed |
| 1136 | */ |
| 1137 | return n; |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1138 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1139 | fail: |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1140 | slab_unlock(page); |
| 1141 | spin_unlock_irqrestore(&n->list_lock, *flags); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1142 | slab_fix(s, "Object at 0x%p not freed", object); |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1143 | return NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1144 | } |
| 1145 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1146 | static int __init setup_slub_debug(char *str) |
| 1147 | { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1148 | slub_debug = DEBUG_DEFAULT_FLAGS; |
| 1149 | if (*str++ != '=' || !*str) |
| 1150 | /* |
| 1151 | * No options specified. Switch on full debugging. |
| 1152 | */ |
| 1153 | goto out; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1154 | |
| 1155 | if (*str == ',') |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1156 | /* |
| 1157 | * No options but restriction on slabs. This means full |
| 1158 | * debugging for slabs matching a pattern. |
| 1159 | */ |
| 1160 | goto check_slabs; |
| 1161 | |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 1162 | if (tolower(*str) == 'o') { |
| 1163 | /* |
| 1164 | * Avoid enabling debugging on caches if its minimum order |
| 1165 | * would increase as a result. |
| 1166 | */ |
| 1167 | disable_higher_order_debug = 1; |
| 1168 | goto out; |
| 1169 | } |
| 1170 | |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1171 | slub_debug = 0; |
| 1172 | if (*str == '-') |
| 1173 | /* |
| 1174 | * Switch off all debugging measures. |
| 1175 | */ |
| 1176 | goto out; |
| 1177 | |
| 1178 | /* |
| 1179 | * Determine which debug features should be switched on |
| 1180 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1181 | for (; *str && *str != ','; str++) { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1182 | switch (tolower(*str)) { |
| 1183 | case 'f': |
| 1184 | slub_debug |= SLAB_DEBUG_FREE; |
| 1185 | break; |
| 1186 | case 'z': |
| 1187 | slub_debug |= SLAB_RED_ZONE; |
| 1188 | break; |
| 1189 | case 'p': |
| 1190 | slub_debug |= SLAB_POISON; |
| 1191 | break; |
| 1192 | case 'u': |
| 1193 | slub_debug |= SLAB_STORE_USER; |
| 1194 | break; |
| 1195 | case 't': |
| 1196 | slub_debug |= SLAB_TRACE; |
| 1197 | break; |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 1198 | case 'a': |
| 1199 | slub_debug |= SLAB_FAILSLAB; |
| 1200 | break; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1201 | default: |
| 1202 | printk(KERN_ERR "slub_debug option '%c' " |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1203 | "unknown. skipped\n", *str); |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | check_slabs: |
| 1208 | if (*str == ',') |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1209 | slub_debug_slabs = str + 1; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1210 | out: |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1211 | return 1; |
| 1212 | } |
| 1213 | |
| 1214 | __setup("slub_debug", setup_slub_debug); |
| 1215 | |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 1216 | static unsigned long kmem_cache_flags(unsigned long object_size, |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1217 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1218 | void (*ctor)(void *)) |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1219 | { |
| 1220 | /* |
Christoph Lameter | e153362 | 2008-02-15 23:45:24 -0800 | [diff] [blame] | 1221 | * Enable debugging if selected on the kernel commandline. |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1222 | */ |
Christoph Lameter | c6f58d9 | 2013-11-07 16:29:15 +0000 | [diff] [blame] | 1223 | if (slub_debug && (!slub_debug_slabs || (name && |
| 1224 | !strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs))))) |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 1225 | flags |= slub_debug; |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1226 | |
| 1227 | return flags; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1228 | } |
| 1229 | #else |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1230 | static inline void setup_object_debug(struct kmem_cache *s, |
| 1231 | struct page *page, void *object) {} |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1232 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1233 | static inline int alloc_debug_processing(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1234 | struct page *page, void *object, unsigned long addr) { return 0; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1235 | |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 1236 | static inline struct kmem_cache_node *free_debug_processing( |
| 1237 | struct kmem_cache *s, struct page *page, void *object, |
| 1238 | unsigned long addr, unsigned long *flags) { return NULL; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1239 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1240 | static inline int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 1241 | { return 1; } |
| 1242 | static inline int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1243 | void *object, u8 val) { return 1; } |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1244 | static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, |
| 1245 | struct page *page) {} |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1246 | static inline void remove_full(struct kmem_cache *s, struct page *page) {} |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 1247 | static inline unsigned long kmem_cache_flags(unsigned long object_size, |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1248 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1249 | void (*ctor)(void *)) |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1250 | { |
| 1251 | return flags; |
| 1252 | } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1253 | #define slub_debug 0 |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1254 | |
Ingo Molnar | fdaa45e | 2009-09-15 11:00:26 +0200 | [diff] [blame] | 1255 | #define disable_higher_order_debug 0 |
| 1256 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1257 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 1258 | { return 0; } |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1259 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 1260 | { return 0; } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1261 | static inline void inc_slabs_node(struct kmem_cache *s, int node, |
| 1262 | int objects) {} |
| 1263 | static inline void dec_slabs_node(struct kmem_cache *s, int node, |
| 1264 | int objects) {} |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1265 | |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1266 | static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) |
| 1267 | { |
| 1268 | kmemleak_alloc(ptr, size, 1, flags); |
| 1269 | } |
| 1270 | |
| 1271 | static inline void kfree_hook(const void *x) |
| 1272 | { |
| 1273 | kmemleak_free(x); |
| 1274 | } |
| 1275 | |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1276 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) |
| 1277 | { return 0; } |
| 1278 | |
| 1279 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1280 | void *object) |
| 1281 | { |
| 1282 | kmemleak_alloc_recursive(object, s->object_size, 1, s->flags, |
| 1283 | flags & gfp_allowed_mask); |
| 1284 | } |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1285 | |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 1286 | static inline void slab_free_hook(struct kmem_cache *s, void *x) |
| 1287 | { |
| 1288 | kmemleak_free_recursive(x, s->flags); |
| 1289 | } |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1290 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 1291 | #endif /* CONFIG_SLUB_DEBUG */ |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1292 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1293 | /* |
| 1294 | * Slab allocation and freeing |
| 1295 | */ |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1296 | static inline struct page *alloc_slab_page(gfp_t flags, int node, |
| 1297 | struct kmem_cache_order_objects oo) |
| 1298 | { |
| 1299 | int order = oo_order(oo); |
| 1300 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1301 | flags |= __GFP_NOTRACK; |
| 1302 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1303 | if (node == NUMA_NO_NODE) |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1304 | return alloc_pages(flags, order); |
| 1305 | else |
Minchan Kim | 6b65aaf | 2010-04-14 23:58:36 +0900 | [diff] [blame] | 1306 | return alloc_pages_exact_node(node, flags, order); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1307 | } |
| 1308 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1309 | static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1310 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1311 | struct page *page; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1312 | struct kmem_cache_order_objects oo = s->oo; |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1313 | gfp_t alloc_gfp; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1314 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1315 | flags &= gfp_allowed_mask; |
| 1316 | |
| 1317 | if (flags & __GFP_WAIT) |
| 1318 | local_irq_enable(); |
| 1319 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 1320 | flags |= s->allocflags; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1321 | |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1322 | /* |
| 1323 | * Let the initial higher-order allocation fail under memory pressure |
| 1324 | * so we fall-back to the minimum order allocation. |
| 1325 | */ |
| 1326 | alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; |
| 1327 | |
| 1328 | page = alloc_slab_page(alloc_gfp, node, oo); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1329 | if (unlikely(!page)) { |
| 1330 | oo = s->min; |
| 1331 | /* |
| 1332 | * Allocation may have failed due to fragmentation. |
| 1333 | * Try a lower order alloc if possible |
| 1334 | */ |
| 1335 | page = alloc_slab_page(flags, node, oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1336 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1337 | if (page) |
| 1338 | stat(s, ORDER_FALLBACK); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1339 | } |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1340 | |
David Rientjes | 737b719 | 2012-07-09 14:00:38 -0700 | [diff] [blame] | 1341 | if (kmemcheck_enabled && page |
Amerigo Wang | 5086c389c | 2009-08-19 21:44:13 +0300 | [diff] [blame] | 1342 | && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1343 | int pages = 1 << oo_order(oo); |
| 1344 | |
| 1345 | kmemcheck_alloc_shadow(page, oo_order(oo), flags, node); |
| 1346 | |
| 1347 | /* |
| 1348 | * Objects from caches that have a constructor don't get |
| 1349 | * cleared when they're allocated, so we need to do it here. |
| 1350 | */ |
| 1351 | if (s->ctor) |
| 1352 | kmemcheck_mark_uninitialized_pages(page, pages); |
| 1353 | else |
| 1354 | kmemcheck_mark_unallocated_pages(page, pages); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1355 | } |
| 1356 | |
David Rientjes | 737b719 | 2012-07-09 14:00:38 -0700 | [diff] [blame] | 1357 | if (flags & __GFP_WAIT) |
| 1358 | local_irq_disable(); |
| 1359 | if (!page) |
| 1360 | return NULL; |
| 1361 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1362 | page->objects = oo_objects(oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1363 | mod_zone_page_state(page_zone(page), |
| 1364 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1365 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1366 | 1 << oo_order(oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1367 | |
| 1368 | return page; |
| 1369 | } |
| 1370 | |
| 1371 | static void setup_object(struct kmem_cache *s, struct page *page, |
| 1372 | void *object) |
| 1373 | { |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1374 | setup_object_debug(s, page, object); |
Christoph Lameter | 4f10493 | 2007-05-06 14:50:17 -0700 | [diff] [blame] | 1375 | if (unlikely(s->ctor)) |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1376 | s->ctor(object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1377 | } |
| 1378 | |
| 1379 | static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1380 | { |
| 1381 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1382 | void *start; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1383 | void *last; |
| 1384 | void *p; |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1385 | int order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1386 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 1387 | BUG_ON(flags & GFP_SLAB_BUG_MASK); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1388 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 1389 | page = allocate_slab(s, |
| 1390 | flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1391 | if (!page) |
| 1392 | goto out; |
| 1393 | |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1394 | order = compound_order(page); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1395 | inc_slabs_node(s, page_to_nid(page), page->objects); |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1396 | memcg_bind_pages(s, order); |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 1397 | page->slab_cache = s; |
Joonsoo Kim | c03f94c | 2012-05-18 00:47:47 +0900 | [diff] [blame] | 1398 | __SetPageSlab(page); |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 1399 | if (page->pfmemalloc) |
| 1400 | SetPageSlabPfmemalloc(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1401 | |
| 1402 | start = page_address(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1403 | |
| 1404 | if (unlikely(s->flags & SLAB_POISON)) |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1405 | memset(start, POISON_INUSE, PAGE_SIZE << order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1406 | |
| 1407 | last = start; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1408 | for_each_object(p, s, start, page->objects) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1409 | setup_object(s, page, last); |
| 1410 | set_freepointer(s, last, p); |
| 1411 | last = p; |
| 1412 | } |
| 1413 | setup_object(s, page, last); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1414 | set_freepointer(s, last, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | page->freelist = start; |
Christoph Lameter | e6e82ea | 2011-08-09 16:12:24 -0500 | [diff] [blame] | 1417 | page->inuse = page->objects; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 1418 | page->frozen = 1; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1419 | out: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1420 | return page; |
| 1421 | } |
| 1422 | |
| 1423 | static void __free_slab(struct kmem_cache *s, struct page *page) |
| 1424 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1425 | int order = compound_order(page); |
| 1426 | int pages = 1 << order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1427 | |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 1428 | if (kmem_cache_debug(s)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1429 | void *p; |
| 1430 | |
| 1431 | slab_pad_check(s, page); |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1432 | for_each_object(p, s, page_address(page), |
| 1433 | page->objects) |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1434 | check_object(s, page, p, SLUB_RED_INACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1435 | } |
| 1436 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1437 | kmemcheck_free_shadow(page, compound_order(page)); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1438 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1439 | mod_zone_page_state(page_zone(page), |
| 1440 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1441 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1442 | -pages); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1443 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 1444 | __ClearPageSlabPfmemalloc(page); |
Christoph Lameter | 49bd522 | 2008-04-14 18:52:18 +0300 | [diff] [blame] | 1445 | __ClearPageSlab(page); |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 1446 | |
| 1447 | memcg_release_pages(s, order); |
Mel Gorman | 22b751c | 2013-02-22 16:34:59 -0800 | [diff] [blame] | 1448 | page_mapcount_reset(page); |
Nick Piggin | 1eb5ac6 | 2009-05-05 19:13:44 +1000 | [diff] [blame] | 1449 | if (current->reclaim_state) |
| 1450 | current->reclaim_state->reclaimed_slab += pages; |
Glauber Costa | d79923f | 2012-12-18 14:22:48 -0800 | [diff] [blame] | 1451 | __free_memcg_kmem_pages(page, order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1454 | #define need_reserve_slab_rcu \ |
| 1455 | (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)) |
| 1456 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1457 | static void rcu_free_slab(struct rcu_head *h) |
| 1458 | { |
| 1459 | struct page *page; |
| 1460 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1461 | if (need_reserve_slab_rcu) |
| 1462 | page = virt_to_head_page(h); |
| 1463 | else |
| 1464 | page = container_of((struct list_head *)h, struct page, lru); |
| 1465 | |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 1466 | __free_slab(page->slab_cache, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1467 | } |
| 1468 | |
| 1469 | static void free_slab(struct kmem_cache *s, struct page *page) |
| 1470 | { |
| 1471 | if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) { |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1472 | struct rcu_head *head; |
| 1473 | |
| 1474 | if (need_reserve_slab_rcu) { |
| 1475 | int order = compound_order(page); |
| 1476 | int offset = (PAGE_SIZE << order) - s->reserved; |
| 1477 | |
| 1478 | VM_BUG_ON(s->reserved != sizeof(*head)); |
| 1479 | head = page_address(page) + offset; |
| 1480 | } else { |
| 1481 | /* |
| 1482 | * RCU free overloads the RCU head over the LRU |
| 1483 | */ |
| 1484 | head = (void *)&page->lru; |
| 1485 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1486 | |
| 1487 | call_rcu(head, rcu_free_slab); |
| 1488 | } else |
| 1489 | __free_slab(s, page); |
| 1490 | } |
| 1491 | |
| 1492 | static void discard_slab(struct kmem_cache *s, struct page *page) |
| 1493 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1494 | dec_slabs_node(s, page_to_nid(page), page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1495 | free_slab(s, page); |
| 1496 | } |
| 1497 | |
| 1498 | /* |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1499 | * Management of partially allocated slabs. |
| 1500 | * |
| 1501 | * list_lock must be held. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1502 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1503 | static inline void add_partial(struct kmem_cache_node *n, |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1504 | struct page *page, int tail) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1505 | { |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 1506 | n->nr_partial++; |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 1507 | if (tail == DEACTIVATE_TO_TAIL) |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1508 | list_add_tail(&page->lru, &n->partial); |
| 1509 | else |
| 1510 | list_add(&page->lru, &n->partial); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1511 | } |
| 1512 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1513 | /* |
| 1514 | * list_lock must be held. |
| 1515 | */ |
| 1516 | static inline void remove_partial(struct kmem_cache_node *n, |
Christoph Lameter | 62e346a | 2010-09-28 08:10:28 -0500 | [diff] [blame] | 1517 | struct page *page) |
| 1518 | { |
| 1519 | list_del(&page->lru); |
| 1520 | n->nr_partial--; |
| 1521 | } |
| 1522 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1523 | /* |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1524 | * Remove slab from the partial list, freeze it and |
| 1525 | * return the pointer to the freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1526 | * |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1527 | * Returns a list of objects or NULL if it fails. |
| 1528 | * |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1529 | * Must hold list_lock since we modify the partial list. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1530 | */ |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1531 | static inline void *acquire_slab(struct kmem_cache *s, |
Christoph Lameter | acd19fd | 2011-08-09 16:12:25 -0500 | [diff] [blame] | 1532 | struct kmem_cache_node *n, struct page *page, |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1533 | int mode, int *objects) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1534 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1535 | void *freelist; |
| 1536 | unsigned long counters; |
| 1537 | struct page new; |
| 1538 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1539 | /* |
| 1540 | * Zap the freelist and set the frozen bit. |
| 1541 | * The old freelist is the list of objects for the |
| 1542 | * per cpu allocation list. |
| 1543 | */ |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1544 | freelist = page->freelist; |
| 1545 | counters = page->counters; |
| 1546 | new.counters = counters; |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1547 | *objects = new.objects - new.inuse; |
Pekka Enberg | 23910c5 | 2012-06-04 10:14:58 +0300 | [diff] [blame] | 1548 | if (mode) { |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1549 | new.inuse = page->objects; |
Pekka Enberg | 23910c5 | 2012-06-04 10:14:58 +0300 | [diff] [blame] | 1550 | new.freelist = NULL; |
| 1551 | } else { |
| 1552 | new.freelist = freelist; |
| 1553 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1554 | |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1555 | VM_BUG_ON(new.frozen); |
| 1556 | new.frozen = 1; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1557 | |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1558 | if (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1559 | freelist, counters, |
Joonsoo Kim | 02d7633 | 2012-05-17 00:13:02 +0900 | [diff] [blame] | 1560 | new.freelist, new.counters, |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1561 | "acquire_slab")) |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1562 | return NULL; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1563 | |
| 1564 | remove_partial(n, page); |
Christoph Lameter | 7ced371 | 2012-05-09 10:09:53 -0500 | [diff] [blame] | 1565 | WARN_ON(!freelist); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1566 | return freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1567 | } |
| 1568 | |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1569 | 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] | 1570 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1571 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1572 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1573 | * Try to allocate a partial slab from a specific node. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1574 | */ |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1575 | static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, |
| 1576 | struct kmem_cache_cpu *c, gfp_t flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1577 | { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1578 | struct page *page, *page2; |
| 1579 | void *object = NULL; |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1580 | int available = 0; |
| 1581 | int objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1582 | |
| 1583 | /* |
| 1584 | * Racy check. If we mistakenly see no partial slabs then we |
| 1585 | * just allocate an empty slab. If we mistakenly try to get a |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1586 | * partial slab and there is none available then get_partials() |
| 1587 | * will return NULL. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1588 | */ |
| 1589 | if (!n || !n->nr_partial) |
| 1590 | return NULL; |
| 1591 | |
| 1592 | spin_lock(&n->list_lock); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1593 | list_for_each_entry_safe(page, page2, &n->partial, lru) { |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1594 | void *t; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1595 | |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1596 | if (!pfmemalloc_match(page, flags)) |
| 1597 | continue; |
| 1598 | |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1599 | t = acquire_slab(s, n, page, object == NULL, &objects); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1600 | if (!t) |
| 1601 | break; |
| 1602 | |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1603 | available += objects; |
Alex,Shi | 12d7963 | 2011-09-07 10:26:36 +0800 | [diff] [blame] | 1604 | if (!object) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1605 | c->page = page; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1606 | stat(s, ALLOC_FROM_PARTIAL); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1607 | object = t; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1608 | } else { |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1609 | put_cpu_partial(s, page, 0); |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 1610 | stat(s, CPU_PARTIAL_NODE); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1611 | } |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 1612 | if (!kmem_cache_has_cpu_partial(s) |
| 1613 | || available > s->cpu_partial / 2) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1614 | break; |
| 1615 | |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1616 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1617 | spin_unlock(&n->list_lock); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1618 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1619 | } |
| 1620 | |
| 1621 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1622 | * Get a page from somewhere. Search in increasing NUMA distances. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1623 | */ |
Joonsoo Kim | de3ec03 | 2012-01-27 00:12:23 -0800 | [diff] [blame] | 1624 | static void *get_any_partial(struct kmem_cache *s, gfp_t flags, |
Christoph Lameter | acd19fd | 2011-08-09 16:12:25 -0500 | [diff] [blame] | 1625 | struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1626 | { |
| 1627 | #ifdef CONFIG_NUMA |
| 1628 | struct zonelist *zonelist; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1629 | struct zoneref *z; |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1630 | struct zone *zone; |
| 1631 | enum zone_type high_zoneidx = gfp_zone(flags); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1632 | void *object; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1633 | unsigned int cpuset_mems_cookie; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1634 | |
| 1635 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1636 | * The defrag ratio allows a configuration of the tradeoffs between |
| 1637 | * inter node defragmentation and node local allocations. A lower |
| 1638 | * defrag_ratio increases the tendency to do local allocations |
| 1639 | * instead of attempting to obtain partial slabs from other nodes. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1640 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1641 | * If the defrag_ratio is set to 0 then kmalloc() always |
| 1642 | * returns node local objects. If the ratio is higher then kmalloc() |
| 1643 | * may return off node objects because partial slabs are obtained |
| 1644 | * from other nodes and filled up. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1645 | * |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1646 | * If /sys/kernel/slab/xx/defrag_ratio is set to 100 (which makes |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1647 | * defrag_ratio = 1000) then every (well almost) allocation will |
| 1648 | * first attempt to defrag slab caches on other nodes. This means |
| 1649 | * scanning over all nodes to look for partial slabs which may be |
| 1650 | * expensive if we do it every time we are trying to find a slab |
| 1651 | * with available objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1652 | */ |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 1653 | if (!s->remote_node_defrag_ratio || |
| 1654 | get_cycles() % 1024 > s->remote_node_defrag_ratio) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1655 | return NULL; |
| 1656 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1657 | do { |
| 1658 | cpuset_mems_cookie = get_mems_allowed(); |
Andi Kleen | e7b691b | 2012-06-09 02:40:03 -0700 | [diff] [blame] | 1659 | zonelist = node_zonelist(slab_node(), flags); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1660 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
| 1661 | struct kmem_cache_node *n; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1662 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1663 | n = get_node(s, zone_to_nid(zone)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1664 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1665 | if (n && cpuset_zone_allowed_hardwall(zone, flags) && |
| 1666 | n->nr_partial > s->min_partial) { |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1667 | object = get_partial_node(s, n, c, flags); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1668 | if (object) { |
| 1669 | /* |
| 1670 | * Return the object even if |
| 1671 | * put_mems_allowed indicated that |
| 1672 | * the cpuset mems_allowed was |
| 1673 | * updated in parallel. It's a |
| 1674 | * harmless race between the alloc |
| 1675 | * and the cpuset update. |
| 1676 | */ |
| 1677 | put_mems_allowed(cpuset_mems_cookie); |
| 1678 | return object; |
| 1679 | } |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1680 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1681 | } |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1682 | } while (!put_mems_allowed(cpuset_mems_cookie)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1683 | #endif |
| 1684 | return NULL; |
| 1685 | } |
| 1686 | |
| 1687 | /* |
| 1688 | * Get a partial page, lock it and return it. |
| 1689 | */ |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1690 | 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] | 1691 | struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1692 | { |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1693 | void *object; |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1694 | int searchnode = (node == NUMA_NO_NODE) ? numa_node_id() : node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1695 | |
Joonsoo Kim | 8ba00bb | 2012-09-17 14:09:09 -0700 | [diff] [blame] | 1696 | object = get_partial_node(s, get_node(s, searchnode), c, flags); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 1697 | if (object || node != NUMA_NO_NODE) |
| 1698 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1699 | |
Christoph Lameter | acd19fd | 2011-08-09 16:12:25 -0500 | [diff] [blame] | 1700 | return get_any_partial(s, flags, c); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1701 | } |
| 1702 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1703 | #ifdef CONFIG_PREEMPT |
| 1704 | /* |
| 1705 | * Calculate the next globally unique transaction for disambiguiation |
| 1706 | * during cmpxchg. The transactions start with the cpu number and are then |
| 1707 | * incremented by CONFIG_NR_CPUS. |
| 1708 | */ |
| 1709 | #define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS) |
| 1710 | #else |
| 1711 | /* |
| 1712 | * No preemption supported therefore also no need to check for |
| 1713 | * different cpus. |
| 1714 | */ |
| 1715 | #define TID_STEP 1 |
| 1716 | #endif |
| 1717 | |
| 1718 | static inline unsigned long next_tid(unsigned long tid) |
| 1719 | { |
| 1720 | return tid + TID_STEP; |
| 1721 | } |
| 1722 | |
| 1723 | static inline unsigned int tid_to_cpu(unsigned long tid) |
| 1724 | { |
| 1725 | return tid % TID_STEP; |
| 1726 | } |
| 1727 | |
| 1728 | static inline unsigned long tid_to_event(unsigned long tid) |
| 1729 | { |
| 1730 | return tid / TID_STEP; |
| 1731 | } |
| 1732 | |
| 1733 | static inline unsigned int init_tid(int cpu) |
| 1734 | { |
| 1735 | return cpu; |
| 1736 | } |
| 1737 | |
| 1738 | static inline void note_cmpxchg_failure(const char *n, |
| 1739 | const struct kmem_cache *s, unsigned long tid) |
| 1740 | { |
| 1741 | #ifdef SLUB_DEBUG_CMPXCHG |
| 1742 | unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid); |
| 1743 | |
| 1744 | printk(KERN_INFO "%s %s: cmpxchg redo ", n, s->name); |
| 1745 | |
| 1746 | #ifdef CONFIG_PREEMPT |
| 1747 | if (tid_to_cpu(tid) != tid_to_cpu(actual_tid)) |
| 1748 | printk("due to cpu change %d -> %d\n", |
| 1749 | tid_to_cpu(tid), tid_to_cpu(actual_tid)); |
| 1750 | else |
| 1751 | #endif |
| 1752 | if (tid_to_event(tid) != tid_to_event(actual_tid)) |
| 1753 | printk("due to cpu running other code. Event %ld->%ld\n", |
| 1754 | tid_to_event(tid), tid_to_event(actual_tid)); |
| 1755 | else |
| 1756 | printk("for unknown reason: actual=%lx was=%lx target=%lx\n", |
| 1757 | actual_tid, tid, next_tid(tid)); |
| 1758 | #endif |
Christoph Lameter | 4fdccdf | 2011-03-22 13:35:00 -0500 | [diff] [blame] | 1759 | stat(s, CMPXCHG_DOUBLE_CPU_FAIL); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1760 | } |
| 1761 | |
Fengguang Wu | 788e1aa | 2012-09-28 16:34:05 +0800 | [diff] [blame] | 1762 | static void init_kmem_cache_cpus(struct kmem_cache *s) |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1763 | { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1764 | int cpu; |
| 1765 | |
| 1766 | for_each_possible_cpu(cpu) |
| 1767 | per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1768 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1769 | |
| 1770 | /* |
| 1771 | * Remove the cpu slab |
| 1772 | */ |
Christoph Lameter | c17dda4 | 2012-05-09 10:09:57 -0500 | [diff] [blame] | 1773 | static void deactivate_slab(struct kmem_cache *s, struct page *page, void *freelist) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1774 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1775 | enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1776 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
| 1777 | int lock = 0; |
| 1778 | enum slab_modes l = M_NONE, m = M_NONE; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1779 | void *nextfree; |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 1780 | int tail = DEACTIVATE_TO_HEAD; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1781 | struct page new; |
| 1782 | struct page old; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 1783 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1784 | if (page->freelist) { |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 1785 | stat(s, DEACTIVATE_REMOTE_FREES); |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 1786 | tail = DEACTIVATE_TO_TAIL; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1787 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1788 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1789 | /* |
| 1790 | * Stage one: Free all available per cpu objects back |
| 1791 | * to the page freelist while it is still frozen. Leave the |
| 1792 | * last one. |
| 1793 | * |
| 1794 | * There is no need to take the list->lock because the page |
| 1795 | * is still frozen. |
| 1796 | */ |
| 1797 | while (freelist && (nextfree = get_freepointer(s, freelist))) { |
| 1798 | void *prior; |
| 1799 | unsigned long counters; |
| 1800 | |
| 1801 | do { |
| 1802 | prior = page->freelist; |
| 1803 | counters = page->counters; |
| 1804 | set_freepointer(s, freelist, prior); |
| 1805 | new.counters = counters; |
| 1806 | new.inuse--; |
| 1807 | VM_BUG_ON(!new.frozen); |
| 1808 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 1809 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1810 | prior, counters, |
| 1811 | freelist, new.counters, |
| 1812 | "drain percpu freelist")); |
| 1813 | |
| 1814 | freelist = nextfree; |
| 1815 | } |
| 1816 | |
| 1817 | /* |
| 1818 | * Stage two: Ensure that the page is unfrozen while the |
| 1819 | * list presence reflects the actual number of objects |
| 1820 | * during unfreeze. |
| 1821 | * |
| 1822 | * We setup the list membership and then perform a cmpxchg |
| 1823 | * with the count. If there is a mismatch then the page |
| 1824 | * is not unfrozen but the page is on the wrong list. |
| 1825 | * |
| 1826 | * Then we restart the process which may have to remove |
| 1827 | * the page from the list that we just put it on again |
| 1828 | * because the number of objects in the slab may have |
| 1829 | * changed. |
| 1830 | */ |
| 1831 | redo: |
| 1832 | |
| 1833 | old.freelist = page->freelist; |
| 1834 | old.counters = page->counters; |
| 1835 | VM_BUG_ON(!old.frozen); |
| 1836 | |
| 1837 | /* Determine target state of the slab */ |
| 1838 | new.counters = old.counters; |
| 1839 | if (freelist) { |
| 1840 | new.inuse--; |
| 1841 | set_freepointer(s, freelist, old.freelist); |
| 1842 | new.freelist = freelist; |
| 1843 | } else |
| 1844 | new.freelist = old.freelist; |
| 1845 | |
| 1846 | new.frozen = 0; |
| 1847 | |
Christoph Lameter | 8110718 | 2011-08-09 13:01:32 -0500 | [diff] [blame] | 1848 | if (!new.inuse && n->nr_partial > s->min_partial) |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1849 | m = M_FREE; |
| 1850 | else if (new.freelist) { |
| 1851 | m = M_PARTIAL; |
| 1852 | if (!lock) { |
| 1853 | lock = 1; |
| 1854 | /* |
| 1855 | * Taking the spinlock removes the possiblity |
| 1856 | * that acquire_slab() will see a slab page that |
| 1857 | * is frozen |
| 1858 | */ |
| 1859 | spin_lock(&n->list_lock); |
| 1860 | } |
| 1861 | } else { |
| 1862 | m = M_FULL; |
| 1863 | if (kmem_cache_debug(s) && !lock) { |
| 1864 | lock = 1; |
| 1865 | /* |
| 1866 | * This also ensures that the scanning of full |
| 1867 | * slabs from diagnostic functions will not see |
| 1868 | * any frozen slabs. |
| 1869 | */ |
| 1870 | spin_lock(&n->list_lock); |
| 1871 | } |
| 1872 | } |
| 1873 | |
| 1874 | if (l != m) { |
| 1875 | |
| 1876 | if (l == M_PARTIAL) |
| 1877 | |
| 1878 | remove_partial(n, page); |
| 1879 | |
| 1880 | else if (l == M_FULL) |
| 1881 | |
| 1882 | remove_full(s, page); |
| 1883 | |
| 1884 | if (m == M_PARTIAL) { |
| 1885 | |
| 1886 | add_partial(n, page, tail); |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 1887 | stat(s, tail); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1888 | |
| 1889 | } else if (m == M_FULL) { |
| 1890 | |
| 1891 | stat(s, DEACTIVATE_FULL); |
| 1892 | add_full(s, n, page); |
| 1893 | |
| 1894 | } |
| 1895 | } |
| 1896 | |
| 1897 | l = m; |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 1898 | if (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1899 | old.freelist, old.counters, |
| 1900 | new.freelist, new.counters, |
| 1901 | "unfreezing slab")) |
| 1902 | goto redo; |
| 1903 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1904 | if (lock) |
| 1905 | spin_unlock(&n->list_lock); |
| 1906 | |
| 1907 | if (m == M_FREE) { |
| 1908 | stat(s, DEACTIVATE_EMPTY); |
| 1909 | discard_slab(s, page); |
| 1910 | stat(s, FREE_SLAB); |
| 1911 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1912 | } |
| 1913 | |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 1914 | /* |
| 1915 | * Unfreeze all the cpu partial slabs. |
| 1916 | * |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 1917 | * This function must be called with interrupts disabled |
| 1918 | * for the cpu using c (or some other guarantee must be there |
| 1919 | * to guarantee no concurrent accesses). |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 1920 | */ |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 1921 | static void unfreeze_partials(struct kmem_cache *s, |
| 1922 | struct kmem_cache_cpu *c) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1923 | { |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 1924 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
Joonsoo Kim | 43d7786 | 2012-06-09 02:23:16 +0900 | [diff] [blame] | 1925 | struct kmem_cache_node *n = NULL, *n2 = NULL; |
Shaohua Li | 9ada193 | 2011-11-14 13:34:13 +0800 | [diff] [blame] | 1926 | struct page *page, *discard_page = NULL; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1927 | |
| 1928 | while ((page = c->partial)) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1929 | struct page new; |
| 1930 | struct page old; |
| 1931 | |
| 1932 | c->partial = page->next; |
Joonsoo Kim | 43d7786 | 2012-06-09 02:23:16 +0900 | [diff] [blame] | 1933 | |
| 1934 | n2 = get_node(s, page_to_nid(page)); |
| 1935 | if (n != n2) { |
| 1936 | if (n) |
| 1937 | spin_unlock(&n->list_lock); |
| 1938 | |
| 1939 | n = n2; |
| 1940 | spin_lock(&n->list_lock); |
| 1941 | } |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1942 | |
| 1943 | do { |
| 1944 | |
| 1945 | old.freelist = page->freelist; |
| 1946 | old.counters = page->counters; |
| 1947 | VM_BUG_ON(!old.frozen); |
| 1948 | |
| 1949 | new.counters = old.counters; |
| 1950 | new.freelist = old.freelist; |
| 1951 | |
| 1952 | new.frozen = 0; |
| 1953 | |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 1954 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1955 | old.freelist, old.counters, |
| 1956 | new.freelist, new.counters, |
| 1957 | "unfreezing slab")); |
| 1958 | |
Joonsoo Kim | 43d7786 | 2012-06-09 02:23:16 +0900 | [diff] [blame] | 1959 | if (unlikely(!new.inuse && n->nr_partial > s->min_partial)) { |
Shaohua Li | 9ada193 | 2011-11-14 13:34:13 +0800 | [diff] [blame] | 1960 | page->next = discard_page; |
| 1961 | discard_page = page; |
Joonsoo Kim | 43d7786 | 2012-06-09 02:23:16 +0900 | [diff] [blame] | 1962 | } else { |
| 1963 | add_partial(n, page, DEACTIVATE_TO_TAIL); |
| 1964 | stat(s, FREE_ADD_PARTIAL); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1965 | } |
| 1966 | } |
| 1967 | |
| 1968 | if (n) |
| 1969 | spin_unlock(&n->list_lock); |
Shaohua Li | 9ada193 | 2011-11-14 13:34:13 +0800 | [diff] [blame] | 1970 | |
| 1971 | while (discard_page) { |
| 1972 | page = discard_page; |
| 1973 | discard_page = discard_page->next; |
| 1974 | |
| 1975 | stat(s, DEACTIVATE_EMPTY); |
| 1976 | discard_slab(s, page); |
| 1977 | stat(s, FREE_SLAB); |
| 1978 | } |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 1979 | #endif |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1980 | } |
| 1981 | |
| 1982 | /* |
| 1983 | * Put a page that was just frozen (in __slab_free) into a partial page |
| 1984 | * slot if available. This is done without interrupts disabled and without |
| 1985 | * preemption disabled. The cmpxchg is racy and may put the partial page |
| 1986 | * onto a random cpus partial slot. |
| 1987 | * |
| 1988 | * If we did not find a slot then simply move all the partials to the |
| 1989 | * per node partial list. |
| 1990 | */ |
Joonsoo Kim | 633b076 | 2013-01-21 17:01:25 +0900 | [diff] [blame] | 1991 | 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] | 1992 | { |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 1993 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 1994 | struct page *oldpage; |
| 1995 | int pages; |
| 1996 | int pobjects; |
| 1997 | |
| 1998 | do { |
| 1999 | pages = 0; |
| 2000 | pobjects = 0; |
| 2001 | oldpage = this_cpu_read(s->cpu_slab->partial); |
| 2002 | |
| 2003 | if (oldpage) { |
| 2004 | pobjects = oldpage->pobjects; |
| 2005 | pages = oldpage->pages; |
| 2006 | if (drain && pobjects > s->cpu_partial) { |
| 2007 | unsigned long flags; |
| 2008 | /* |
| 2009 | * partial array is full. Move the existing |
| 2010 | * set to the per node partial list. |
| 2011 | */ |
| 2012 | local_irq_save(flags); |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 2013 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2014 | local_irq_restore(flags); |
Joonsoo Kim | e24fc41 | 2012-06-23 03:22:38 +0900 | [diff] [blame] | 2015 | oldpage = NULL; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2016 | pobjects = 0; |
| 2017 | pages = 0; |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 2018 | stat(s, CPU_PARTIAL_DRAIN); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2019 | } |
| 2020 | } |
| 2021 | |
| 2022 | pages++; |
| 2023 | pobjects += page->objects - page->inuse; |
| 2024 | |
| 2025 | page->pages = pages; |
| 2026 | page->pobjects = pobjects; |
| 2027 | page->next = oldpage; |
| 2028 | |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 2029 | } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage); |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2030 | #endif |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2031 | } |
| 2032 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2033 | 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] | 2034 | { |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2035 | stat(s, CPUSLAB_FLUSH); |
Christoph Lameter | c17dda4 | 2012-05-09 10:09:57 -0500 | [diff] [blame] | 2036 | deactivate_slab(s, c->page, c->freelist); |
| 2037 | |
| 2038 | c->tid = next_tid(c->tid); |
| 2039 | c->page = NULL; |
| 2040 | c->freelist = NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2041 | } |
| 2042 | |
| 2043 | /* |
| 2044 | * Flush cpu slab. |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2045 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2046 | * Called from IPI handler with interrupts disabled. |
| 2047 | */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 2048 | static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2049 | { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2050 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2051 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2052 | if (likely(c)) { |
| 2053 | if (c->page) |
| 2054 | flush_slab(s, c); |
| 2055 | |
Christoph Lameter | 59a0991 | 2012-11-28 16:23:00 +0000 | [diff] [blame] | 2056 | unfreeze_partials(s, c); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2057 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2058 | } |
| 2059 | |
| 2060 | static void flush_cpu_slab(void *d) |
| 2061 | { |
| 2062 | struct kmem_cache *s = d; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2063 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2064 | __flush_cpu_slab(s, smp_processor_id()); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2065 | } |
| 2066 | |
Gilad Ben-Yossef | a8364d5 | 2012-03-28 14:42:44 -0700 | [diff] [blame] | 2067 | static bool has_cpu_slab(int cpu, void *info) |
| 2068 | { |
| 2069 | struct kmem_cache *s = info; |
| 2070 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
| 2071 | |
majianpeng | 02e1a9c | 2012-05-17 17:03:26 -0700 | [diff] [blame] | 2072 | return c->page || c->partial; |
Gilad Ben-Yossef | a8364d5 | 2012-03-28 14:42:44 -0700 | [diff] [blame] | 2073 | } |
| 2074 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2075 | static void flush_all(struct kmem_cache *s) |
| 2076 | { |
Gilad Ben-Yossef | a8364d5 | 2012-03-28 14:42:44 -0700 | [diff] [blame] | 2077 | 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] | 2078 | } |
| 2079 | |
| 2080 | /* |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2081 | * Check if the objects in a per cpu structure fit numa |
| 2082 | * locality expectations. |
| 2083 | */ |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2084 | static inline int node_match(struct page *page, int node) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2085 | { |
| 2086 | #ifdef CONFIG_NUMA |
Christoph Lameter | 4d7868e | 2013-01-23 21:45:47 +0000 | [diff] [blame] | 2087 | if (!page || (node != NUMA_NO_NODE && page_to_nid(page) != node)) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2088 | return 0; |
| 2089 | #endif |
| 2090 | return 1; |
| 2091 | } |
| 2092 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2093 | static int count_free(struct page *page) |
| 2094 | { |
| 2095 | return page->objects - page->inuse; |
| 2096 | } |
| 2097 | |
| 2098 | static unsigned long count_partial(struct kmem_cache_node *n, |
| 2099 | int (*get_count)(struct page *)) |
| 2100 | { |
| 2101 | unsigned long flags; |
| 2102 | unsigned long x = 0; |
| 2103 | struct page *page; |
| 2104 | |
| 2105 | spin_lock_irqsave(&n->list_lock, flags); |
| 2106 | list_for_each_entry(page, &n->partial, lru) |
| 2107 | x += get_count(page); |
| 2108 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 2109 | return x; |
| 2110 | } |
| 2111 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 2112 | static inline unsigned long node_nr_objs(struct kmem_cache_node *n) |
| 2113 | { |
| 2114 | #ifdef CONFIG_SLUB_DEBUG |
| 2115 | return atomic_long_read(&n->total_objects); |
| 2116 | #else |
| 2117 | return 0; |
| 2118 | #endif |
| 2119 | } |
| 2120 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2121 | static noinline void |
| 2122 | slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid) |
| 2123 | { |
| 2124 | int node; |
| 2125 | |
| 2126 | printk(KERN_WARNING |
| 2127 | "SLUB: Unable to allocate memory on node %d (gfp=0x%x)\n", |
| 2128 | nid, gfpflags); |
| 2129 | printk(KERN_WARNING " cache: %s, object size: %d, buffer size: %d, " |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2130 | "default order: %d, min order: %d\n", s->name, s->object_size, |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2131 | s->size, oo_order(s->oo), oo_order(s->min)); |
| 2132 | |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2133 | if (oo_order(s->min) > get_order(s->object_size)) |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 2134 | printk(KERN_WARNING " %s debugging increased min order, use " |
| 2135 | "slub_debug=O to disable.\n", s->name); |
| 2136 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2137 | for_each_online_node(node) { |
| 2138 | struct kmem_cache_node *n = get_node(s, node); |
| 2139 | unsigned long nr_slabs; |
| 2140 | unsigned long nr_objs; |
| 2141 | unsigned long nr_free; |
| 2142 | |
| 2143 | if (!n) |
| 2144 | continue; |
| 2145 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 2146 | nr_free = count_partial(n, count_free); |
| 2147 | nr_slabs = node_nr_slabs(n); |
| 2148 | nr_objs = node_nr_objs(n); |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 2149 | |
| 2150 | printk(KERN_WARNING |
| 2151 | " node %d: slabs: %ld, objs: %ld, free: %ld\n", |
| 2152 | node, nr_slabs, nr_objs, nr_free); |
| 2153 | } |
| 2154 | } |
| 2155 | |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2156 | static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags, |
| 2157 | int node, struct kmem_cache_cpu **pc) |
| 2158 | { |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2159 | void *freelist; |
Christoph Lameter | 188fd06 | 2012-05-09 10:09:55 -0500 | [diff] [blame] | 2160 | struct kmem_cache_cpu *c = *pc; |
| 2161 | struct page *page; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2162 | |
Christoph Lameter | 188fd06 | 2012-05-09 10:09:55 -0500 | [diff] [blame] | 2163 | freelist = get_partial(s, flags, node, c); |
| 2164 | |
| 2165 | if (freelist) |
| 2166 | return freelist; |
| 2167 | |
| 2168 | page = new_slab(s, flags, node); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2169 | if (page) { |
| 2170 | c = __this_cpu_ptr(s->cpu_slab); |
| 2171 | if (c->page) |
| 2172 | flush_slab(s, c); |
| 2173 | |
| 2174 | /* |
| 2175 | * No other reference to the page yet so we can |
| 2176 | * muck around with it freely without cmpxchg |
| 2177 | */ |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2178 | freelist = page->freelist; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2179 | page->freelist = NULL; |
| 2180 | |
| 2181 | stat(s, ALLOC_SLAB); |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2182 | c->page = page; |
| 2183 | *pc = c; |
| 2184 | } else |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2185 | freelist = NULL; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2186 | |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2187 | return freelist; |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2188 | } |
| 2189 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 2190 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags) |
| 2191 | { |
| 2192 | if (unlikely(PageSlabPfmemalloc(page))) |
| 2193 | return gfp_pfmemalloc_allowed(gfpflags); |
| 2194 | |
| 2195 | return true; |
| 2196 | } |
| 2197 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2198 | /* |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2199 | * Check the page->freelist of a page and either transfer the freelist to the per cpu freelist |
| 2200 | * or deactivate the page. |
| 2201 | * |
| 2202 | * The page is still frozen if the return value is not NULL. |
| 2203 | * |
| 2204 | * If this function returns NULL then the page has been unfrozen. |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 2205 | * |
| 2206 | * This function must be called with interrupt disabled. |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2207 | */ |
| 2208 | static inline void *get_freelist(struct kmem_cache *s, struct page *page) |
| 2209 | { |
| 2210 | struct page new; |
| 2211 | unsigned long counters; |
| 2212 | void *freelist; |
| 2213 | |
| 2214 | do { |
| 2215 | freelist = page->freelist; |
| 2216 | counters = page->counters; |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2217 | |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2218 | new.counters = counters; |
| 2219 | VM_BUG_ON(!new.frozen); |
| 2220 | |
| 2221 | new.inuse = page->objects; |
| 2222 | new.frozen = freelist != NULL; |
| 2223 | |
Joonsoo Kim | d24ac77 | 2012-05-18 22:01:17 +0900 | [diff] [blame] | 2224 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 213eeb9 | 2011-11-11 14:07:14 -0600 | [diff] [blame] | 2225 | freelist, counters, |
| 2226 | NULL, new.counters, |
| 2227 | "get_freelist")); |
| 2228 | |
| 2229 | return freelist; |
| 2230 | } |
| 2231 | |
| 2232 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2233 | * Slow path. The lockless freelist is empty or we need to perform |
| 2234 | * debugging duties. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2235 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2236 | * Processing is still very fast if new objects have been freed to the |
| 2237 | * regular freelist. In that case we simply take over the regular freelist |
| 2238 | * as the lockless freelist and zap the regular freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2239 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2240 | * If that is not working then we fall back to the partial lists. We take the |
| 2241 | * first element of the freelist as the object to allocate now and move the |
| 2242 | * rest of the freelist to the lockless freelist. |
| 2243 | * |
| 2244 | * 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] | 2245 | * we need to allocate a new slab. This is the slowest path since it involves |
| 2246 | * a call to the page allocator and the setup of a new slab. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2247 | */ |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2248 | static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
| 2249 | unsigned long addr, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2250 | { |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2251 | void *freelist; |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2252 | struct page *page; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2253 | unsigned long flags; |
| 2254 | |
| 2255 | local_irq_save(flags); |
| 2256 | #ifdef CONFIG_PREEMPT |
| 2257 | /* |
| 2258 | * We may have been preempted and rescheduled on a different |
| 2259 | * cpu before disabling interrupts. Need to reload cpu area |
| 2260 | * pointer. |
| 2261 | */ |
| 2262 | c = this_cpu_ptr(s->cpu_slab); |
| 2263 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2264 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2265 | page = c->page; |
| 2266 | if (!page) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2267 | goto new_slab; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2268 | redo: |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2269 | |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2270 | if (unlikely(!node_match(page, node))) { |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 2271 | stat(s, ALLOC_NODE_MISMATCH); |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2272 | deactivate_slab(s, page, c->freelist); |
Christoph Lameter | c17dda4 | 2012-05-09 10:09:57 -0500 | [diff] [blame] | 2273 | c->page = NULL; |
| 2274 | c->freelist = NULL; |
Christoph Lameter | fc59c05 | 2011-06-01 12:25:56 -0500 | [diff] [blame] | 2275 | goto new_slab; |
| 2276 | } |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2277 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 2278 | /* |
| 2279 | * By rights, we should be searching for a slab page that was |
| 2280 | * PFMEMALLOC but right now, we are losing the pfmemalloc |
| 2281 | * information when the page leaves the per-cpu allocator |
| 2282 | */ |
| 2283 | if (unlikely(!pfmemalloc_match(page, gfpflags))) { |
| 2284 | deactivate_slab(s, page, c->freelist); |
| 2285 | c->page = NULL; |
| 2286 | c->freelist = NULL; |
| 2287 | goto new_slab; |
| 2288 | } |
| 2289 | |
Eric Dumazet | 73736e0 | 2011-12-13 04:57:06 +0100 | [diff] [blame] | 2290 | /* must check again c->freelist in case of cpu migration or IRQ */ |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2291 | freelist = c->freelist; |
| 2292 | if (freelist) |
Eric Dumazet | 73736e0 | 2011-12-13 04:57:06 +0100 | [diff] [blame] | 2293 | goto load_freelist; |
| 2294 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2295 | stat(s, ALLOC_SLOWPATH); |
| 2296 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2297 | freelist = get_freelist(s, page); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2298 | |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2299 | if (!freelist) { |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 2300 | c->page = NULL; |
| 2301 | stat(s, DEACTIVATE_BYPASS); |
Christoph Lameter | fc59c05 | 2011-06-01 12:25:56 -0500 | [diff] [blame] | 2302 | goto new_slab; |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 2303 | } |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2304 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2305 | stat(s, ALLOC_REFILL); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 2306 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2307 | load_freelist: |
Christoph Lameter | 507effe | 2012-05-09 10:09:52 -0500 | [diff] [blame] | 2308 | /* |
| 2309 | * freelist is pointing to the list of objects to be used. |
| 2310 | * page is pointing to the page from which the objects are obtained. |
| 2311 | * That page must be frozen for per cpu allocations to work. |
| 2312 | */ |
| 2313 | VM_BUG_ON(!c->page->frozen); |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2314 | c->freelist = get_freepointer(s, freelist); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2315 | c->tid = next_tid(c->tid); |
| 2316 | local_irq_restore(flags); |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2317 | return freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2318 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2319 | new_slab: |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2320 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2321 | if (c->partial) { |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2322 | page = c->page = c->partial; |
| 2323 | c->partial = page->next; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2324 | stat(s, CPU_PARTIAL_ALLOC); |
| 2325 | c->freelist = NULL; |
| 2326 | goto redo; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2327 | } |
| 2328 | |
Christoph Lameter | 188fd06 | 2012-05-09 10:09:55 -0500 | [diff] [blame] | 2329 | freelist = new_slab_objects(s, gfpflags, node, &c); |
Christoph Lameter | b811c20 | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 2330 | |
Christoph Lameter | f4697436 | 2012-05-09 10:09:54 -0500 | [diff] [blame] | 2331 | if (unlikely(!freelist)) { |
| 2332 | if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit()) |
| 2333 | slab_out_of_memory(s, gfpflags, node); |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2334 | |
Christoph Lameter | f4697436 | 2012-05-09 10:09:54 -0500 | [diff] [blame] | 2335 | local_irq_restore(flags); |
| 2336 | return NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2337 | } |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2338 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2339 | page = c->page; |
Christoph Lameter | 5091b74 | 2012-07-31 16:44:00 -0700 | [diff] [blame] | 2340 | if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2341 | goto load_freelist; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2342 | |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2343 | /* Only entered in the debug case */ |
Christoph Lameter | 5091b74 | 2012-07-31 16:44:00 -0700 | [diff] [blame] | 2344 | if (kmem_cache_debug(s) && !alloc_debug_processing(s, page, freelist, addr)) |
Christoph Lameter | 497b66f | 2011-08-09 16:12:26 -0500 | [diff] [blame] | 2345 | goto new_slab; /* Slab failed checks. Next slab needed */ |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2346 | |
Christoph Lameter | f6e7def | 2012-05-09 10:09:58 -0500 | [diff] [blame] | 2347 | deactivate_slab(s, page, get_freepointer(s, freelist)); |
Christoph Lameter | c17dda4 | 2012-05-09 10:09:57 -0500 | [diff] [blame] | 2348 | c->page = NULL; |
| 2349 | c->freelist = NULL; |
Christoph Lameter | a71ae47 | 2011-05-25 09:47:43 -0500 | [diff] [blame] | 2350 | local_irq_restore(flags); |
Christoph Lameter | 6faa683 | 2012-05-09 10:09:51 -0500 | [diff] [blame] | 2351 | return freelist; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2352 | } |
| 2353 | |
| 2354 | /* |
| 2355 | * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc) |
| 2356 | * have the fastpath folded into their functions. So no function call |
| 2357 | * overhead for requests that can be satisfied on the fastpath. |
| 2358 | * |
| 2359 | * The fastpath works by first checking if the lockless freelist can be used. |
| 2360 | * If not then __slab_alloc is called for slow processing. |
| 2361 | * |
| 2362 | * Otherwise we can simply pick the next object from the lockless free list. |
| 2363 | */ |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2364 | static __always_inline void *slab_alloc_node(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2365 | gfp_t gfpflags, int node, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2366 | { |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2367 | void **object; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2368 | struct kmem_cache_cpu *c; |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2369 | struct page *page; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2370 | unsigned long tid; |
Christoph Lameter | 1f84260 | 2008-01-07 23:20:30 -0800 | [diff] [blame] | 2371 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2372 | if (slab_pre_alloc_hook(s, gfpflags)) |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 2373 | return NULL; |
| 2374 | |
Glauber Costa | d79923f | 2012-12-18 14:22:48 -0800 | [diff] [blame] | 2375 | s = memcg_kmem_get_cache(s, gfpflags); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2376 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2377 | /* |
| 2378 | * Must read kmem_cache cpu data via this cpu ptr. Preemption is |
| 2379 | * enabled. We may switch back and forth between cpus while |
| 2380 | * reading from one cpu area. That does not matter as long |
| 2381 | * 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] | 2382 | * |
| 2383 | * Preemption is disabled for the retrieval of the tid because that |
| 2384 | * must occur from the current processor. We cannot allow rescheduling |
| 2385 | * on a different processor between the determination of the pointer |
| 2386 | * and the retrieval of the tid. |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2387 | */ |
Christoph Lameter | 7cccd80 | 2013-01-23 21:45:48 +0000 | [diff] [blame] | 2388 | preempt_disable(); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2389 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2390 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2391 | /* |
| 2392 | * The transaction ids are globally unique per cpu and per operation on |
| 2393 | * a per cpu queue. Thus they can be guarantee that the cmpxchg_double |
| 2394 | * occurs on the right processor and that there was no operation on the |
| 2395 | * linked list in between. |
| 2396 | */ |
| 2397 | tid = c->tid; |
Christoph Lameter | 7cccd80 | 2013-01-23 21:45:48 +0000 | [diff] [blame] | 2398 | preempt_enable(); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2399 | |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2400 | object = c->freelist; |
Christoph Lameter | 57d437d | 2012-05-09 10:09:59 -0500 | [diff] [blame] | 2401 | page = c->page; |
Steven Rostedt | c25f195 | 2013-01-17 13:10:58 -0500 | [diff] [blame] | 2402 | if (unlikely(!object || !page || !node_match(page, node))) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2403 | object = __slab_alloc(s, gfpflags, node, addr, c); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2404 | |
| 2405 | else { |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 2406 | void *next_object = get_freepointer_safe(s, object); |
| 2407 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2408 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2409 | * The cmpxchg will only match if there was no additional |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2410 | * operation and if we are on the right processor. |
| 2411 | * |
| 2412 | * The cmpxchg does the following atomically (without lock semantics!) |
| 2413 | * 1. Relocate first pointer to the current per cpu area. |
| 2414 | * 2. Verify that tid and freelist have not been changed |
| 2415 | * 3. If they were not changed replace tid and freelist |
| 2416 | * |
| 2417 | * Since this is without lock semantics the protection is only against |
| 2418 | * code executing on this cpu *not* from access by other cpus. |
| 2419 | */ |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 2420 | if (unlikely(!this_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2421 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2422 | object, tid, |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 2423 | next_object, next_tid(tid)))) { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2424 | |
| 2425 | note_cmpxchg_failure("slab_alloc", s, tid); |
| 2426 | goto redo; |
| 2427 | } |
Eric Dumazet | 0ad9500 | 2011-12-16 16:25:34 +0100 | [diff] [blame] | 2428 | prefetch_freepointer(s, next_object); |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2429 | stat(s, ALLOC_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2430 | } |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2431 | |
Pekka Enberg | 74e2134 | 2009-11-25 20:14:48 +0200 | [diff] [blame] | 2432 | if (unlikely(gfpflags & __GFP_ZERO) && object) |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2433 | memset(object, 0, s->object_size); |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 2434 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2435 | slab_post_alloc_hook(s, gfpflags, object); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 2436 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2437 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2438 | } |
| 2439 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2440 | static __always_inline void *slab_alloc(struct kmem_cache *s, |
| 2441 | gfp_t gfpflags, unsigned long addr) |
| 2442 | { |
| 2443 | return slab_alloc_node(s, gfpflags, NUMA_NO_NODE, addr); |
| 2444 | } |
| 2445 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2446 | void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) |
| 2447 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2448 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2449 | |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2450 | trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size, s->size, gfpflags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2451 | |
| 2452 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2453 | } |
| 2454 | EXPORT_SYMBOL(kmem_cache_alloc); |
| 2455 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2456 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2457 | 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] | 2458 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2459 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2460 | trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); |
| 2461 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2462 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2463 | EXPORT_SYMBOL(kmem_cache_alloc_trace); |
| 2464 | |
| 2465 | void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) |
| 2466 | { |
| 2467 | void *ret = kmalloc_order(size, flags, order); |
| 2468 | trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << order, flags); |
| 2469 | return ret; |
| 2470 | } |
| 2471 | EXPORT_SYMBOL(kmalloc_order_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2472 | #endif |
| 2473 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2474 | #ifdef CONFIG_NUMA |
| 2475 | void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) |
| 2476 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2477 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2478 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2479 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2480 | s->object_size, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2481 | |
| 2482 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2483 | } |
| 2484 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2485 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2486 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2487 | void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2488 | gfp_t gfpflags, |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2489 | int node, size_t size) |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2490 | { |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 2491 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2492 | |
| 2493 | trace_kmalloc_node(_RET_IP_, ret, |
| 2494 | size, s->size, gfpflags, node); |
| 2495 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2496 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2497 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2498 | #endif |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 2499 | #endif |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2500 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2501 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2502 | * Slow patch handling. This may still be called frequently since objects |
| 2503 | * have a longer lifetime than the cpu slabs in most processing loads. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2504 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2505 | * So we still attempt to reduce cache line usage. Just take the slab |
| 2506 | * lock and free the item. If there is no additional partial page |
| 2507 | * handling required then we can return immediately. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2508 | */ |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2509 | static void __slab_free(struct kmem_cache *s, struct page *page, |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2510 | void *x, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2511 | { |
| 2512 | void *prior; |
| 2513 | void **object = (void *)x; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2514 | int was_frozen; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2515 | struct page new; |
| 2516 | unsigned long counters; |
| 2517 | struct kmem_cache_node *n = NULL; |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 2518 | unsigned long uninitialized_var(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2519 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2520 | stat(s, FREE_SLOWPATH); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2521 | |
Christoph Lameter | 19c7ff9 | 2012-05-30 12:54:46 -0500 | [diff] [blame] | 2522 | if (kmem_cache_debug(s) && |
| 2523 | !(n = free_debug_processing(s, page, x, addr, &flags))) |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2524 | return; |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2525 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2526 | do { |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2527 | if (unlikely(n)) { |
| 2528 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 2529 | n = NULL; |
| 2530 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2531 | prior = page->freelist; |
| 2532 | counters = page->counters; |
| 2533 | set_freepointer(s, object, prior); |
| 2534 | new.counters = counters; |
| 2535 | was_frozen = new.frozen; |
| 2536 | new.inuse--; |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2537 | if ((!new.inuse || !prior) && !was_frozen) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2538 | |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2539 | if (kmem_cache_has_cpu_partial(s) && !prior) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2540 | |
| 2541 | /* |
| 2542 | * Slab was on no list before and will be partially empty |
| 2543 | * We can defer the list move and instead freeze it. |
| 2544 | */ |
| 2545 | new.frozen = 1; |
| 2546 | |
| 2547 | else { /* Needs to be taken off a list */ |
| 2548 | |
| 2549 | n = get_node(s, page_to_nid(page)); |
| 2550 | /* |
| 2551 | * Speculatively acquire the list_lock. |
| 2552 | * If the cmpxchg does not succeed then we may |
| 2553 | * drop the list_lock without any processing. |
| 2554 | * |
| 2555 | * Otherwise the list_lock will synchronize with |
| 2556 | * other processors updating the list of slabs. |
| 2557 | */ |
| 2558 | spin_lock_irqsave(&n->list_lock, flags); |
| 2559 | |
| 2560 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2561 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2562 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2563 | } while (!cmpxchg_double_slab(s, page, |
| 2564 | prior, counters, |
| 2565 | object, new.counters, |
| 2566 | "__slab_free")); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2567 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2568 | if (likely(!n)) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2569 | |
| 2570 | /* |
| 2571 | * If we just froze the page then put it onto the |
| 2572 | * per cpu partial list. |
| 2573 | */ |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 2574 | if (new.frozen && !was_frozen) { |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2575 | put_cpu_partial(s, page, 1); |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 2576 | stat(s, CPU_PARTIAL_FREE); |
| 2577 | } |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 2578 | /* |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2579 | * The list lock was not taken therefore no list |
| 2580 | * activity can be necessary. |
| 2581 | */ |
| 2582 | if (was_frozen) |
| 2583 | stat(s, FREE_FROZEN); |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2584 | return; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2585 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2586 | |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2587 | if (unlikely(!new.inuse && n->nr_partial > s->min_partial)) |
| 2588 | goto slab_empty; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2589 | |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2590 | /* |
| 2591 | * Objects left in the slab. If it was not on the partial list before |
| 2592 | * then add it. |
| 2593 | */ |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 2594 | if (!kmem_cache_has_cpu_partial(s) && unlikely(!prior)) { |
| 2595 | if (kmem_cache_debug(s)) |
| 2596 | remove_full(s, page); |
Joonsoo Kim | 837d678 | 2012-08-16 00:02:40 +0900 | [diff] [blame] | 2597 | add_partial(n, page, DEACTIVATE_TO_TAIL); |
| 2598 | stat(s, FREE_ADD_PARTIAL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2599 | } |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2600 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2601 | return; |
| 2602 | |
| 2603 | slab_empty: |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 2604 | if (prior) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2605 | /* |
Christoph Lameter | 6fbabb2 | 2011-08-08 11:16:56 -0500 | [diff] [blame] | 2606 | * Slab on the partial list. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2607 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2608 | remove_partial(n, page); |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2609 | stat(s, FREE_REMOVE_PARTIAL); |
Christoph Lameter | 6fbabb2 | 2011-08-08 11:16:56 -0500 | [diff] [blame] | 2610 | } else |
| 2611 | /* Slab must be on the full list */ |
| 2612 | remove_full(s, page); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2613 | |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2614 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2615 | stat(s, FREE_SLAB); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2616 | discard_slab(s, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2617 | } |
| 2618 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2619 | /* |
| 2620 | * Fastpath with forced inlining to produce a kfree and kmem_cache_free that |
| 2621 | * can perform fastpath freeing without additional function calls. |
| 2622 | * |
| 2623 | * The fastpath is only possible if we are freeing to the current cpu slab |
| 2624 | * of this processor. This typically the case if we have just allocated |
| 2625 | * the item before. |
| 2626 | * |
| 2627 | * If fastpath is not possible then fall back to __slab_free where we deal |
| 2628 | * with all sorts of special processing. |
| 2629 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2630 | static __always_inline void slab_free(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2631 | struct page *page, void *x, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2632 | { |
| 2633 | void **object = (void *)x; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2634 | struct kmem_cache_cpu *c; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2635 | unsigned long tid; |
Christoph Lameter | 1f84260 | 2008-01-07 23:20:30 -0800 | [diff] [blame] | 2636 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2637 | slab_free_hook(s, x); |
| 2638 | |
Christoph Lameter | a24c5a0 | 2011-03-15 12:45:21 -0500 | [diff] [blame] | 2639 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2640 | /* |
| 2641 | * Determine the currently cpus per cpu slab. |
| 2642 | * The cpu may change afterward. However that does not matter since |
| 2643 | * data is retrieved via this pointer. If we are on the same cpu |
| 2644 | * during the cmpxchg then the free will succedd. |
| 2645 | */ |
Christoph Lameter | 7cccd80 | 2013-01-23 21:45:48 +0000 | [diff] [blame] | 2646 | preempt_disable(); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2647 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2648 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2649 | tid = c->tid; |
Christoph Lameter | 7cccd80 | 2013-01-23 21:45:48 +0000 | [diff] [blame] | 2650 | preempt_enable(); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2651 | |
Christoph Lameter | 442b06b | 2011-05-17 16:29:31 -0500 | [diff] [blame] | 2652 | if (likely(page == c->page)) { |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2653 | set_freepointer(s, object, c->freelist); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2654 | |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 2655 | if (unlikely(!this_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2656 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2657 | c->freelist, tid, |
| 2658 | object, next_tid(tid)))) { |
| 2659 | |
| 2660 | note_cmpxchg_failure("slab_free", s, tid); |
| 2661 | goto redo; |
| 2662 | } |
Christoph Lameter | 84e554e6 | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2663 | stat(s, FREE_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2664 | } else |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2665 | __slab_free(s, page, x, addr); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2666 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2667 | } |
| 2668 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2669 | void kmem_cache_free(struct kmem_cache *s, void *x) |
| 2670 | { |
Glauber Costa | b9ce5ef | 2012-12-18 14:22:46 -0800 | [diff] [blame] | 2671 | s = cache_from_obj(s, x); |
| 2672 | if (!s) |
Christoph Lameter | 7957610 | 2012-09-04 23:06:14 +0000 | [diff] [blame] | 2673 | return; |
Glauber Costa | b9ce5ef | 2012-12-18 14:22:46 -0800 | [diff] [blame] | 2674 | slab_free(s, virt_to_head_page(x), x, _RET_IP_); |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2675 | trace_kmem_cache_free(_RET_IP_, x); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2676 | } |
| 2677 | EXPORT_SYMBOL(kmem_cache_free); |
| 2678 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2679 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2680 | * Object placement in a slab is made very easy because we always start at |
| 2681 | * offset 0. If we tune the size of the object to the alignment then we can |
| 2682 | * get the required alignment by putting one properly sized object after |
| 2683 | * another. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2684 | * |
| 2685 | * Notice that the allocation order determines the sizes of the per cpu |
| 2686 | * caches. Each processor has always one slab available for allocations. |
| 2687 | * Increasing the allocation order reduces the number of times that slabs |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2688 | * 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] | 2689 | * locking overhead. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2690 | */ |
| 2691 | |
| 2692 | /* |
| 2693 | * Mininum / Maximum order of slab pages. This influences locking overhead |
| 2694 | * and slab fragmentation. A higher order reduces the number of partial slabs |
| 2695 | * and increases the number of allocations possible without having to |
| 2696 | * take the list_lock. |
| 2697 | */ |
| 2698 | static int slub_min_order; |
Christoph Lameter | 114e9e8 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2699 | static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2700 | static int slub_min_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2701 | |
| 2702 | /* |
| 2703 | * Merge control. If this is set then no merging of slab caches will occur. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2704 | * (Could be removed. This was introduced to pacify the merge skeptics.) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2705 | */ |
| 2706 | static int slub_nomerge; |
| 2707 | |
| 2708 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2709 | * Calculate the order of allocation given an slab object size. |
| 2710 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2711 | * The order of allocation has significant impact on performance and other |
| 2712 | * system components. Generally order 0 allocations should be preferred since |
| 2713 | * order 0 does not cause fragmentation in the page allocator. Larger objects |
| 2714 | * 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] | 2715 | * 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] | 2716 | * would be wasted. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2717 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2718 | * In order to reach satisfactory performance we must ensure that a minimum |
| 2719 | * number of objects is in one slab. Otherwise we may generate too much |
| 2720 | * activity on the partial lists which requires taking the list_lock. This is |
| 2721 | * less a concern for large slabs though which are rarely used. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2722 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2723 | * slub_max_order specifies the order where we begin to stop considering the |
| 2724 | * number of objects in a slab as critical. If we reach slub_max_order then |
| 2725 | * we try to keep the page order as low as possible. So we accept more waste |
| 2726 | * of space in favor of a small page order. |
| 2727 | * |
| 2728 | * Higher order allocations also allow the placement of more objects in a |
| 2729 | * slab and thereby reduce object handling overhead. If the user has |
| 2730 | * requested a higher mininum order then we start with that one instead of |
| 2731 | * the smallest order which will fit the object. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2732 | */ |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2733 | static inline int slab_order(int size, int min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2734 | int max_order, int fract_leftover, int reserved) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2735 | { |
| 2736 | int order; |
| 2737 | int rem; |
Christoph Lameter | 6300ea7 | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 2738 | int min_order = slub_min_order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2739 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2740 | if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE) |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 2741 | return get_order(size * MAX_OBJS_PER_PAGE) - 1; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 2742 | |
Christoph Lameter | 6300ea7 | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 2743 | for (order = max(min_order, |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2744 | fls(min_objects * size - 1) - PAGE_SHIFT); |
| 2745 | order <= max_order; order++) { |
| 2746 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2747 | unsigned long slab_size = PAGE_SIZE << order; |
| 2748 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2749 | if (slab_size < min_objects * size + reserved) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2750 | continue; |
| 2751 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2752 | rem = (slab_size - reserved) % size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2753 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2754 | if (rem <= slab_size / fract_leftover) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2755 | break; |
| 2756 | |
| 2757 | } |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2758 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2759 | return order; |
| 2760 | } |
| 2761 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2762 | static inline int calculate_order(int size, int reserved) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2763 | { |
| 2764 | int order; |
| 2765 | int min_objects; |
| 2766 | int fraction; |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 2767 | int max_objects; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2768 | |
| 2769 | /* |
| 2770 | * Attempt to find best configuration for a slab. This |
| 2771 | * works by first attempting to generate a layout with |
| 2772 | * the best configuration and backing off gradually. |
| 2773 | * |
| 2774 | * First we reduce the acceptable waste in a slab. Then |
| 2775 | * we reduce the minimum objects required in a slab. |
| 2776 | */ |
| 2777 | min_objects = slub_min_objects; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2778 | if (!min_objects) |
| 2779 | min_objects = 4 * (fls(nr_cpu_ids) + 1); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2780 | max_objects = order_objects(slub_max_order, size, reserved); |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 2781 | min_objects = min(min_objects, max_objects); |
| 2782 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2783 | while (min_objects > 1) { |
Christoph Lameter | c124f5b | 2008-04-14 19:13:29 +0300 | [diff] [blame] | 2784 | fraction = 16; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2785 | while (fraction >= 4) { |
| 2786 | order = slab_order(size, min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2787 | slub_max_order, fraction, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2788 | if (order <= slub_max_order) |
| 2789 | return order; |
| 2790 | fraction /= 2; |
| 2791 | } |
Amerigo Wang | 5086c389c | 2009-08-19 21:44:13 +0300 | [diff] [blame] | 2792 | min_objects--; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2793 | } |
| 2794 | |
| 2795 | /* |
| 2796 | * We were unable to place multiple objects in a slab. Now |
| 2797 | * lets see if we can place a single object there. |
| 2798 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2799 | order = slab_order(size, 1, slub_max_order, 1, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2800 | if (order <= slub_max_order) |
| 2801 | return order; |
| 2802 | |
| 2803 | /* |
| 2804 | * Doh this slab cannot be placed using slub_max_order. |
| 2805 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2806 | order = slab_order(size, 1, MAX_ORDER, 1, reserved); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 2807 | if (order < MAX_ORDER) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2808 | return order; |
| 2809 | return -ENOSYS; |
| 2810 | } |
| 2811 | |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 2812 | static void |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 2813 | init_kmem_cache_node(struct kmem_cache_node *n) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2814 | { |
| 2815 | n->nr_partial = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2816 | spin_lock_init(&n->list_lock); |
| 2817 | INIT_LIST_HEAD(&n->partial); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2818 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 2819 | atomic_long_set(&n->nr_slabs, 0); |
Salman Qazi | 02b71b7 | 2008-09-11 12:25:41 -0700 | [diff] [blame] | 2820 | atomic_long_set(&n->total_objects, 0); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 2821 | INIT_LIST_HEAD(&n->full); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2822 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2823 | } |
| 2824 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2825 | static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2826 | { |
Christoph Lameter | 6c182dc | 2010-08-20 12:37:14 -0500 | [diff] [blame] | 2827 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 2828 | KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2829 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2830 | /* |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 2831 | * Must align to double word boundary for the double cmpxchg |
| 2832 | * instructions to work; see __pcpu_double_call_return_bool(). |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2833 | */ |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 2834 | s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), |
| 2835 | 2 * sizeof(void *)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2836 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2837 | if (!s->cpu_slab) |
| 2838 | return 0; |
| 2839 | |
| 2840 | init_kmem_cache_cpus(s); |
| 2841 | |
| 2842 | return 1; |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2843 | } |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2844 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2845 | static struct kmem_cache *kmem_cache_node; |
| 2846 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2847 | /* |
| 2848 | * No kmalloc_node yet so do it by hand. We know that this is the first |
| 2849 | * slab on the node for this slabcache. There are no concurrent accesses |
| 2850 | * possible. |
| 2851 | * |
Zhi Yong Wu | 721ae22 | 2013-11-08 20:47:37 +0800 | [diff] [blame^] | 2852 | * Note that this function only works on the kmem_cache_node |
| 2853 | * when allocating for the kmem_cache_node. This is used for bootstrapping |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2854 | * memory on a fresh node that has no slab structures yet. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2855 | */ |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2856 | static void early_kmem_cache_node_alloc(int node) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2857 | { |
| 2858 | struct page *page; |
| 2859 | struct kmem_cache_node *n; |
| 2860 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2861 | BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2862 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2863 | page = new_slab(kmem_cache_node, GFP_NOWAIT, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2864 | |
| 2865 | BUG_ON(!page); |
Christoph Lameter | a2f92ee | 2007-08-22 14:01:57 -0700 | [diff] [blame] | 2866 | if (page_to_nid(page) != node) { |
| 2867 | printk(KERN_ERR "SLUB: Unable to allocate memory from " |
| 2868 | "node %d\n", node); |
| 2869 | printk(KERN_ERR "SLUB: Allocating a useless per node structure " |
| 2870 | "in order to be able to continue\n"); |
| 2871 | } |
| 2872 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2873 | n = page->freelist; |
| 2874 | BUG_ON(!n); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2875 | page->freelist = get_freepointer(kmem_cache_node, n); |
Christoph Lameter | e6e82ea | 2011-08-09 16:12:24 -0500 | [diff] [blame] | 2876 | page->inuse = 1; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 2877 | page->frozen = 0; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2878 | kmem_cache_node->node[node] = n; |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2879 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 2880 | init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2881 | init_tracking(kmem_cache_node, n); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2882 | #endif |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 2883 | init_kmem_cache_node(n); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2884 | inc_slabs_node(kmem_cache_node, node, page->objects); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2885 | |
Shaohua Li | 136333d | 2011-08-24 08:57:52 +0800 | [diff] [blame] | 2886 | add_partial(n, page, DEACTIVATE_TO_HEAD); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2887 | } |
| 2888 | |
| 2889 | static void free_kmem_cache_nodes(struct kmem_cache *s) |
| 2890 | { |
| 2891 | int node; |
| 2892 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 2893 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2894 | struct kmem_cache_node *n = s->node[node]; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2895 | |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2896 | if (n) |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2897 | kmem_cache_free(kmem_cache_node, n); |
| 2898 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2899 | s->node[node] = NULL; |
| 2900 | } |
| 2901 | } |
| 2902 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2903 | static int init_kmem_cache_nodes(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2904 | { |
| 2905 | int node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2906 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 2907 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2908 | struct kmem_cache_node *n; |
| 2909 | |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2910 | if (slab_state == DOWN) { |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2911 | early_kmem_cache_node_alloc(node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2912 | continue; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2913 | } |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2914 | n = kmem_cache_alloc_node(kmem_cache_node, |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2915 | GFP_KERNEL, node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2916 | |
| 2917 | if (!n) { |
| 2918 | free_kmem_cache_nodes(s); |
| 2919 | return 0; |
| 2920 | } |
| 2921 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2922 | s->node[node] = n; |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 2923 | init_kmem_cache_node(n); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2924 | } |
| 2925 | return 1; |
| 2926 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2927 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 2928 | static void set_min_partial(struct kmem_cache *s, unsigned long min) |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 2929 | { |
| 2930 | if (min < MIN_PARTIAL) |
| 2931 | min = MIN_PARTIAL; |
| 2932 | else if (min > MAX_PARTIAL) |
| 2933 | min = MAX_PARTIAL; |
| 2934 | s->min_partial = min; |
| 2935 | } |
| 2936 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2937 | /* |
| 2938 | * calculate_sizes() determines the order and the distribution of data within |
| 2939 | * a slab object. |
| 2940 | */ |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2941 | static int calculate_sizes(struct kmem_cache *s, int forced_order) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2942 | { |
| 2943 | unsigned long flags = s->flags; |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2944 | unsigned long size = s->object_size; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2945 | int order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2946 | |
| 2947 | /* |
Christoph Lameter | d8b42bf | 2008-02-15 23:45:25 -0800 | [diff] [blame] | 2948 | * Round up object size to the next word boundary. We can only |
| 2949 | * place the free pointer at word boundaries and this determines |
| 2950 | * the possible location of the free pointer. |
| 2951 | */ |
| 2952 | size = ALIGN(size, sizeof(void *)); |
| 2953 | |
| 2954 | #ifdef CONFIG_SLUB_DEBUG |
| 2955 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2956 | * Determine if we can poison the object itself. If the user of |
| 2957 | * the slab may touch the object after free or before allocation |
| 2958 | * then we should never poison the object itself. |
| 2959 | */ |
| 2960 | if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) && |
Christoph Lameter | c59def9 | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 2961 | !s->ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2962 | s->flags |= __OBJECT_POISON; |
| 2963 | else |
| 2964 | s->flags &= ~__OBJECT_POISON; |
| 2965 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2966 | |
| 2967 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2968 | * 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] | 2969 | * 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] | 2970 | * additional word to have some bytes to store Redzone information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2971 | */ |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 2972 | if ((flags & SLAB_RED_ZONE) && size == s->object_size) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2973 | size += sizeof(void *); |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 2974 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2975 | |
| 2976 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2977 | * With that we have determined the number of bytes in actual use |
| 2978 | * by the object. This is the potential offset to the free pointer. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2979 | */ |
| 2980 | s->inuse = size; |
| 2981 | |
| 2982 | if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) || |
Christoph Lameter | c59def9 | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 2983 | s->ctor)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2984 | /* |
| 2985 | * Relocate free pointer after the object if it is not |
| 2986 | * permitted to overwrite the first word of the object on |
| 2987 | * kmem_cache_free. |
| 2988 | * |
| 2989 | * This is the case if we do RCU, have a constructor or |
| 2990 | * destructor or are poisoning the objects. |
| 2991 | */ |
| 2992 | s->offset = size; |
| 2993 | size += sizeof(void *); |
| 2994 | } |
| 2995 | |
Christoph Lameter | c12b3c6 | 2007-05-23 13:57:31 -0700 | [diff] [blame] | 2996 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2997 | if (flags & SLAB_STORE_USER) |
| 2998 | /* |
| 2999 | * Need to store information about allocs and frees after |
| 3000 | * the object. |
| 3001 | */ |
| 3002 | size += 2 * sizeof(struct track); |
| 3003 | |
Christoph Lameter | be7b3fb | 2007-05-09 02:32:36 -0700 | [diff] [blame] | 3004 | if (flags & SLAB_RED_ZONE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3005 | /* |
| 3006 | * Add some empty padding so that we can catch |
| 3007 | * overwrites from earlier objects rather than let |
| 3008 | * tracking information or the free pointer be |
Frederik Schwarzer | 0211a9c | 2008-12-29 22:14:56 +0100 | [diff] [blame] | 3009 | * corrupted if a user writes before the start |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3010 | * of the object. |
| 3011 | */ |
| 3012 | size += sizeof(void *); |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 3013 | #endif |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3014 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3015 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3016 | * SLUB stores one object immediately after another beginning from |
| 3017 | * offset 0. In order to align the objects we have to simply size |
| 3018 | * each object to conform to the alignment. |
| 3019 | */ |
Christoph Lameter | 4590685 | 2012-11-28 16:23:16 +0000 | [diff] [blame] | 3020 | size = ALIGN(size, s->align); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3021 | s->size = size; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3022 | if (forced_order >= 0) |
| 3023 | order = forced_order; |
| 3024 | else |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3025 | order = calculate_order(size, s->reserved); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3026 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3027 | if (order < 0) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3028 | return 0; |
| 3029 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 3030 | s->allocflags = 0; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3031 | if (order) |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 3032 | s->allocflags |= __GFP_COMP; |
| 3033 | |
| 3034 | if (s->flags & SLAB_CACHE_DMA) |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3035 | s->allocflags |= GFP_DMA; |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 3036 | |
| 3037 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 3038 | s->allocflags |= __GFP_RECLAIMABLE; |
| 3039 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3040 | /* |
| 3041 | * Determine the number of objects per slab |
| 3042 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3043 | s->oo = oo_make(order, size, s->reserved); |
| 3044 | s->min = oo_make(get_order(size), size, s->reserved); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3045 | if (oo_objects(s->oo) > oo_objects(s->max)) |
| 3046 | s->max = s->oo; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3047 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3048 | return !!oo_objects(s->oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3049 | } |
| 3050 | |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3051 | static int kmem_cache_open(struct kmem_cache *s, unsigned long flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3052 | { |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3053 | s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 3054 | s->reserved = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3055 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 3056 | if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU)) |
| 3057 | s->reserved = sizeof(struct rcu_head); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3058 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3059 | if (!calculate_sizes(s, -1)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3060 | goto error; |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 3061 | if (disable_higher_order_debug) { |
| 3062 | /* |
| 3063 | * Disable debugging flags that store metadata if the min slab |
| 3064 | * order increased. |
| 3065 | */ |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 3066 | if (get_order(s->size) > get_order(s->object_size)) { |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 3067 | s->flags &= ~DEBUG_METADATA_FLAGS; |
| 3068 | s->offset = 0; |
| 3069 | if (!calculate_sizes(s, -1)) |
| 3070 | goto error; |
| 3071 | } |
| 3072 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3073 | |
Heiko Carstens | 2565409 | 2012-01-12 17:17:33 -0800 | [diff] [blame] | 3074 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
| 3075 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 3076 | if (system_has_cmpxchg_double() && (s->flags & SLAB_DEBUG_FLAGS) == 0) |
| 3077 | /* Enable fast mode */ |
| 3078 | s->flags |= __CMPXCHG_DOUBLE; |
| 3079 | #endif |
| 3080 | |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 3081 | /* |
| 3082 | * The larger the object size is, the more pages we want on the partial |
| 3083 | * list to avoid pounding the page allocator excessively. |
| 3084 | */ |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 3085 | set_min_partial(s, ilog2(s->size) / 2); |
| 3086 | |
| 3087 | /* |
| 3088 | * cpu_partial determined the maximum number of objects kept in the |
| 3089 | * per cpu partial lists of a processor. |
| 3090 | * |
| 3091 | * Per cpu partial lists mainly contain slabs that just have one |
| 3092 | * object freed. If they are used for allocation then they can be |
| 3093 | * filled up again with minimal effort. The slab will never hit the |
| 3094 | * per node partial lists and therefore no locking will be required. |
| 3095 | * |
| 3096 | * This setting also determines |
| 3097 | * |
| 3098 | * A) The number of objects from per cpu partial slabs dumped to the |
| 3099 | * per node list when we reach the limit. |
Alex Shi | 9f26490 | 2011-09-01 11:32:18 +0800 | [diff] [blame] | 3100 | * B) The number of objects in cpu partial slabs to extract from the |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 3101 | * per node list when we run out of per cpu objects. We only fetch 50% |
| 3102 | * to keep some capacity around for frees. |
| 3103 | */ |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 3104 | if (!kmem_cache_has_cpu_partial(s)) |
Christoph Lameter | 8f1e33d | 2011-11-23 09:24:27 -0600 | [diff] [blame] | 3105 | s->cpu_partial = 0; |
| 3106 | else if (s->size >= PAGE_SIZE) |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 3107 | s->cpu_partial = 2; |
| 3108 | else if (s->size >= 1024) |
| 3109 | s->cpu_partial = 6; |
| 3110 | else if (s->size >= 256) |
| 3111 | s->cpu_partial = 13; |
| 3112 | else |
| 3113 | s->cpu_partial = 30; |
| 3114 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3115 | #ifdef CONFIG_NUMA |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 3116 | s->remote_node_defrag_ratio = 1000; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3117 | #endif |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3118 | if (!init_kmem_cache_nodes(s)) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 3119 | goto error; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3120 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3121 | if (alloc_kmem_cache_cpus(s)) |
Christoph Lameter | 278b1bb | 2012-09-05 00:20:34 +0000 | [diff] [blame] | 3122 | return 0; |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 3123 | |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 3124 | free_kmem_cache_nodes(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3125 | error: |
| 3126 | if (flags & SLAB_PANIC) |
| 3127 | panic("Cannot create slab %s size=%lu realsize=%u " |
| 3128 | "order=%u offset=%u flags=%lx\n", |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3129 | s->name, (unsigned long)s->size, s->size, oo_order(s->oo), |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3130 | s->offset, flags); |
Christoph Lameter | 278b1bb | 2012-09-05 00:20:34 +0000 | [diff] [blame] | 3131 | return -EINVAL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3132 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3133 | |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3134 | static void list_slab_objects(struct kmem_cache *s, struct page *page, |
| 3135 | const char *text) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3136 | { |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3137 | #ifdef CONFIG_SLUB_DEBUG |
| 3138 | void *addr = page_address(page); |
| 3139 | void *p; |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 3140 | unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) * |
| 3141 | sizeof(long), GFP_ATOMIC); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 3142 | if (!map) |
| 3143 | return; |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3144 | slab_err(s, page, text, s->name); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3145 | slab_lock(page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3146 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 3147 | get_map(s, page, map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3148 | for_each_object(p, s, addr, page->objects) { |
| 3149 | |
| 3150 | if (!test_bit(slab_index(p, s, addr), map)) { |
| 3151 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu\n", |
| 3152 | p, p - addr); |
| 3153 | print_tracking(s, p); |
| 3154 | } |
| 3155 | } |
| 3156 | slab_unlock(page); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 3157 | kfree(map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3158 | #endif |
| 3159 | } |
| 3160 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3161 | /* |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3162 | * Attempt to free all partial slabs on a node. |
Christoph Lameter | 69cb8e6 | 2011-08-09 16:12:22 -0500 | [diff] [blame] | 3163 | * This is called from kmem_cache_close(). We must be the last thread |
| 3164 | * using the cache and therefore we do not need to lock anymore. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3165 | */ |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3166 | 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] | 3167 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3168 | struct page *page, *h; |
| 3169 | |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3170 | list_for_each_entry_safe(page, h, &n->partial, lru) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3171 | if (!page->inuse) { |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 3172 | remove_partial(n, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3173 | discard_slab(s, page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3174 | } else { |
| 3175 | list_slab_objects(s, page, |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3176 | "Objects remaining in %s on kmem_cache_close()"); |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3177 | } |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 3178 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3179 | } |
| 3180 | |
| 3181 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3182 | * Release all resources used by a slab cache. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3183 | */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 3184 | static inline int kmem_cache_close(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3185 | { |
| 3186 | int node; |
| 3187 | |
| 3188 | flush_all(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3189 | /* Attempt to free all objects */ |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3190 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3191 | struct kmem_cache_node *n = get_node(s, node); |
| 3192 | |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 3193 | free_partial(s, n); |
| 3194 | if (n->nr_partial || slabs_node(s, node)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3195 | return 1; |
| 3196 | } |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3197 | free_percpu(s->cpu_slab); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3198 | free_kmem_cache_nodes(s); |
| 3199 | return 0; |
| 3200 | } |
| 3201 | |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3202 | int __kmem_cache_shutdown(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3203 | { |
Christoph Lameter | 12c3667 | 2012-09-04 23:38:33 +0000 | [diff] [blame] | 3204 | int rc = kmem_cache_close(s); |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3205 | |
Glauber Costa | 5413dfb | 2012-12-18 14:23:13 -0800 | [diff] [blame] | 3206 | if (!rc) { |
| 3207 | /* |
| 3208 | * We do the same lock strategy around sysfs_slab_add, see |
| 3209 | * __kmem_cache_create. Because this is pretty much the last |
| 3210 | * operation we do and the lock will be released shortly after |
| 3211 | * that in slab_common.c, we could just move sysfs_slab_remove |
| 3212 | * to a later point in common code. We should do that when we |
| 3213 | * have a common sysfs framework for all allocators. |
| 3214 | */ |
| 3215 | mutex_unlock(&slab_mutex); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3216 | sysfs_slab_remove(s); |
Glauber Costa | 5413dfb | 2012-12-18 14:23:13 -0800 | [diff] [blame] | 3217 | mutex_lock(&slab_mutex); |
| 3218 | } |
Christoph Lameter | 12c3667 | 2012-09-04 23:38:33 +0000 | [diff] [blame] | 3219 | |
| 3220 | return rc; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3221 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3222 | |
| 3223 | /******************************************************************** |
| 3224 | * Kmalloc subsystem |
| 3225 | *******************************************************************/ |
| 3226 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3227 | static int __init setup_slub_min_order(char *str) |
| 3228 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3229 | get_option(&str, &slub_min_order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3230 | |
| 3231 | return 1; |
| 3232 | } |
| 3233 | |
| 3234 | __setup("slub_min_order=", setup_slub_min_order); |
| 3235 | |
| 3236 | static int __init setup_slub_max_order(char *str) |
| 3237 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3238 | get_option(&str, &slub_max_order); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 3239 | slub_max_order = min(slub_max_order, MAX_ORDER - 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3240 | |
| 3241 | return 1; |
| 3242 | } |
| 3243 | |
| 3244 | __setup("slub_max_order=", setup_slub_max_order); |
| 3245 | |
| 3246 | static int __init setup_slub_min_objects(char *str) |
| 3247 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3248 | get_option(&str, &slub_min_objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3249 | |
| 3250 | return 1; |
| 3251 | } |
| 3252 | |
| 3253 | __setup("slub_min_objects=", setup_slub_min_objects); |
| 3254 | |
| 3255 | static int __init setup_slub_nomerge(char *str) |
| 3256 | { |
| 3257 | slub_nomerge = 1; |
| 3258 | return 1; |
| 3259 | } |
| 3260 | |
| 3261 | __setup("slub_nomerge", setup_slub_nomerge); |
| 3262 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3263 | void *__kmalloc(size_t size, gfp_t flags) |
| 3264 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3265 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3266 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3267 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3268 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3269 | return kmalloc_large(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3270 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3271 | s = kmalloc_slab(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3272 | |
| 3273 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3274 | return s; |
| 3275 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 3276 | ret = slab_alloc(s, flags, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3277 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3278 | trace_kmalloc(_RET_IP_, ret, size, s->size, flags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3279 | |
| 3280 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3281 | } |
| 3282 | EXPORT_SYMBOL(__kmalloc); |
| 3283 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3284 | #ifdef CONFIG_NUMA |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3285 | static void *kmalloc_large_node(size_t size, gfp_t flags, int node) |
| 3286 | { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 3287 | struct page *page; |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3288 | void *ptr = NULL; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3289 | |
Glauber Costa | d79923f | 2012-12-18 14:22:48 -0800 | [diff] [blame] | 3290 | flags |= __GFP_COMP | __GFP_NOTRACK | __GFP_KMEMCG; |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 3291 | page = alloc_pages_node(node, flags, get_order(size)); |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3292 | if (page) |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3293 | ptr = page_address(page); |
| 3294 | |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 3295 | kmalloc_large_node_hook(ptr, size, flags); |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3296 | return ptr; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3297 | } |
| 3298 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3299 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| 3300 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3301 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3302 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3303 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3304 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3305 | ret = kmalloc_large_node(size, flags, node); |
| 3306 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3307 | trace_kmalloc_node(_RET_IP_, ret, |
| 3308 | size, PAGE_SIZE << get_order(size), |
| 3309 | flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3310 | |
| 3311 | return ret; |
| 3312 | } |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3313 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3314 | s = kmalloc_slab(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3315 | |
| 3316 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3317 | return s; |
| 3318 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 3319 | ret = slab_alloc_node(s, flags, node, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3320 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3321 | trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3322 | |
| 3323 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3324 | } |
| 3325 | EXPORT_SYMBOL(__kmalloc_node); |
| 3326 | #endif |
| 3327 | |
| 3328 | size_t ksize(const void *object) |
| 3329 | { |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3330 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3331 | |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 3332 | if (unlikely(object == ZERO_SIZE_PTR)) |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3333 | return 0; |
| 3334 | |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3335 | page = virt_to_head_page(object); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3336 | |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3337 | if (unlikely(!PageSlab(page))) { |
| 3338 | WARN_ON(!PageCompound(page)); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3339 | return PAGE_SIZE << compound_order(page); |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3340 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3341 | |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 3342 | return slab_ksize(page->slab_cache); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3343 | } |
Kirill A. Shutemov | b1aabec | 2009-02-10 15:21:44 +0200 | [diff] [blame] | 3344 | EXPORT_SYMBOL(ksize); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3345 | |
Ben Greear | d18a90d | 2011-07-07 11:36:37 -0700 | [diff] [blame] | 3346 | #ifdef CONFIG_SLUB_DEBUG |
| 3347 | bool verify_mem_not_deleted(const void *x) |
| 3348 | { |
| 3349 | struct page *page; |
| 3350 | void *object = (void *)x; |
| 3351 | unsigned long flags; |
| 3352 | bool rv; |
| 3353 | |
| 3354 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
| 3355 | return false; |
| 3356 | |
| 3357 | local_irq_save(flags); |
| 3358 | |
| 3359 | page = virt_to_head_page(x); |
| 3360 | if (unlikely(!PageSlab(page))) { |
| 3361 | /* maybe it was from stack? */ |
| 3362 | rv = true; |
| 3363 | goto out_unlock; |
| 3364 | } |
| 3365 | |
| 3366 | slab_lock(page); |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 3367 | if (on_freelist(page->slab_cache, page, object)) { |
| 3368 | object_err(page->slab_cache, page, object, "Object is on free-list"); |
Ben Greear | d18a90d | 2011-07-07 11:36:37 -0700 | [diff] [blame] | 3369 | rv = false; |
| 3370 | } else { |
| 3371 | rv = true; |
| 3372 | } |
| 3373 | slab_unlock(page); |
| 3374 | |
| 3375 | out_unlock: |
| 3376 | local_irq_restore(flags); |
| 3377 | return rv; |
| 3378 | } |
| 3379 | EXPORT_SYMBOL(verify_mem_not_deleted); |
| 3380 | #endif |
| 3381 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3382 | void kfree(const void *x) |
| 3383 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3384 | struct page *page; |
Christoph Lameter | 5bb983b | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 3385 | void *object = (void *)x; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3386 | |
Pekka Enberg | 2121db7 | 2009-03-25 11:05:57 +0200 | [diff] [blame] | 3387 | trace_kfree(_RET_IP_, x); |
| 3388 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3389 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3390 | return; |
| 3391 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 3392 | page = virt_to_head_page(x); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3393 | if (unlikely(!PageSlab(page))) { |
Christoph Lameter | 0937502 | 2008-05-28 10:32:22 -0700 | [diff] [blame] | 3394 | BUG_ON(!PageCompound(page)); |
Roman Bobniev | d56791b | 2013-10-08 15:58:57 -0700 | [diff] [blame] | 3395 | kfree_hook(x); |
Glauber Costa | d79923f | 2012-12-18 14:22:48 -0800 | [diff] [blame] | 3396 | __free_memcg_kmem_pages(page, compound_order(page)); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3397 | return; |
| 3398 | } |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 3399 | slab_free(page->slab_cache, page, object, _RET_IP_); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3400 | } |
| 3401 | EXPORT_SYMBOL(kfree); |
| 3402 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3403 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3404 | * kmem_cache_shrink removes empty slabs from the partial lists and sorts |
| 3405 | * the remaining slabs by the number of items in use. The slabs with the |
| 3406 | * most items in use come first. New allocations will then fill those up |
| 3407 | * and thus they can be removed from the partial lists. |
| 3408 | * |
| 3409 | * The slabs with the least items are placed last. This results in them |
| 3410 | * being allocated from last increasing the chance that the last objects |
| 3411 | * are freed in them. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3412 | */ |
| 3413 | int kmem_cache_shrink(struct kmem_cache *s) |
| 3414 | { |
| 3415 | int node; |
| 3416 | int i; |
| 3417 | struct kmem_cache_node *n; |
| 3418 | struct page *page; |
| 3419 | struct page *t; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3420 | int objects = oo_objects(s->max); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3421 | struct list_head *slabs_by_inuse = |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3422 | kmalloc(sizeof(struct list_head) * objects, GFP_KERNEL); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3423 | unsigned long flags; |
| 3424 | |
| 3425 | if (!slabs_by_inuse) |
| 3426 | return -ENOMEM; |
| 3427 | |
| 3428 | flush_all(s); |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3429 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3430 | n = get_node(s, node); |
| 3431 | |
| 3432 | if (!n->nr_partial) |
| 3433 | continue; |
| 3434 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3435 | for (i = 0; i < objects; i++) |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3436 | INIT_LIST_HEAD(slabs_by_inuse + i); |
| 3437 | |
| 3438 | spin_lock_irqsave(&n->list_lock, flags); |
| 3439 | |
| 3440 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3441 | * Build lists indexed by the items in use in each slab. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3442 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3443 | * Note that concurrent frees may occur while we hold the |
| 3444 | * list_lock. page->inuse here is the upper limit. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3445 | */ |
| 3446 | list_for_each_entry_safe(page, t, &n->partial, lru) { |
Christoph Lameter | 69cb8e6 | 2011-08-09 16:12:22 -0500 | [diff] [blame] | 3447 | list_move(&page->lru, slabs_by_inuse + page->inuse); |
| 3448 | if (!page->inuse) |
| 3449 | n->nr_partial--; |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3450 | } |
| 3451 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3452 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3453 | * Rebuild the partial list with the slabs filled up most |
| 3454 | * first and the least used slabs at the end. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3455 | */ |
Christoph Lameter | 69cb8e6 | 2011-08-09 16:12:22 -0500 | [diff] [blame] | 3456 | for (i = objects - 1; i > 0; i--) |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3457 | list_splice(slabs_by_inuse + i, n->partial.prev); |
| 3458 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3459 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 69cb8e6 | 2011-08-09 16:12:22 -0500 | [diff] [blame] | 3460 | |
| 3461 | /* Release empty slabs */ |
| 3462 | list_for_each_entry_safe(page, t, slabs_by_inuse, lru) |
| 3463 | discard_slab(s, page); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3464 | } |
| 3465 | |
| 3466 | kfree(slabs_by_inuse); |
| 3467 | return 0; |
| 3468 | } |
| 3469 | EXPORT_SYMBOL(kmem_cache_shrink); |
| 3470 | |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3471 | static int slab_mem_going_offline_callback(void *arg) |
| 3472 | { |
| 3473 | struct kmem_cache *s; |
| 3474 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3475 | mutex_lock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3476 | list_for_each_entry(s, &slab_caches, list) |
| 3477 | kmem_cache_shrink(s); |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3478 | mutex_unlock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3479 | |
| 3480 | return 0; |
| 3481 | } |
| 3482 | |
| 3483 | static void slab_mem_offline_callback(void *arg) |
| 3484 | { |
| 3485 | struct kmem_cache_node *n; |
| 3486 | struct kmem_cache *s; |
| 3487 | struct memory_notify *marg = arg; |
| 3488 | int offline_node; |
| 3489 | |
Lai Jiangshan | b9d5ab2 | 2012-12-11 16:01:05 -0800 | [diff] [blame] | 3490 | offline_node = marg->status_change_nid_normal; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3491 | |
| 3492 | /* |
| 3493 | * If the node still has available memory. we need kmem_cache_node |
| 3494 | * for it yet. |
| 3495 | */ |
| 3496 | if (offline_node < 0) |
| 3497 | return; |
| 3498 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3499 | mutex_lock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3500 | list_for_each_entry(s, &slab_caches, list) { |
| 3501 | n = get_node(s, offline_node); |
| 3502 | if (n) { |
| 3503 | /* |
| 3504 | * if n->nr_slabs > 0, slabs still exist on the node |
| 3505 | * that is going down. We were unable to free them, |
Adam Buchbinder | c9404c9 | 2009-12-18 15:40:42 -0500 | [diff] [blame] | 3506 | * and offline_pages() function shouldn't call this |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3507 | * callback. So, we must fail. |
| 3508 | */ |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 3509 | BUG_ON(slabs_node(s, offline_node)); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3510 | |
| 3511 | s->node[offline_node] = NULL; |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3512 | kmem_cache_free(kmem_cache_node, n); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3513 | } |
| 3514 | } |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3515 | mutex_unlock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3516 | } |
| 3517 | |
| 3518 | static int slab_mem_going_online_callback(void *arg) |
| 3519 | { |
| 3520 | struct kmem_cache_node *n; |
| 3521 | struct kmem_cache *s; |
| 3522 | struct memory_notify *marg = arg; |
Lai Jiangshan | b9d5ab2 | 2012-12-11 16:01:05 -0800 | [diff] [blame] | 3523 | int nid = marg->status_change_nid_normal; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3524 | int ret = 0; |
| 3525 | |
| 3526 | /* |
| 3527 | * If the node's memory is already available, then kmem_cache_node is |
| 3528 | * already created. Nothing to do. |
| 3529 | */ |
| 3530 | if (nid < 0) |
| 3531 | return 0; |
| 3532 | |
| 3533 | /* |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 3534 | * 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] | 3535 | * allocate a kmem_cache_node structure in order to bring the node |
| 3536 | * online. |
| 3537 | */ |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3538 | mutex_lock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3539 | list_for_each_entry(s, &slab_caches, list) { |
| 3540 | /* |
| 3541 | * XXX: kmem_cache_alloc_node will fallback to other nodes |
| 3542 | * since memory is not yet available from the node that |
| 3543 | * is brought up. |
| 3544 | */ |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3545 | n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3546 | if (!n) { |
| 3547 | ret = -ENOMEM; |
| 3548 | goto out; |
| 3549 | } |
Joonsoo Kim | 4053497 | 2012-05-11 00:50:47 +0900 | [diff] [blame] | 3550 | init_kmem_cache_node(n); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3551 | s->node[nid] = n; |
| 3552 | } |
| 3553 | out: |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3554 | mutex_unlock(&slab_mutex); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3555 | return ret; |
| 3556 | } |
| 3557 | |
| 3558 | static int slab_memory_callback(struct notifier_block *self, |
| 3559 | unsigned long action, void *arg) |
| 3560 | { |
| 3561 | int ret = 0; |
| 3562 | |
| 3563 | switch (action) { |
| 3564 | case MEM_GOING_ONLINE: |
| 3565 | ret = slab_mem_going_online_callback(arg); |
| 3566 | break; |
| 3567 | case MEM_GOING_OFFLINE: |
| 3568 | ret = slab_mem_going_offline_callback(arg); |
| 3569 | break; |
| 3570 | case MEM_OFFLINE: |
| 3571 | case MEM_CANCEL_ONLINE: |
| 3572 | slab_mem_offline_callback(arg); |
| 3573 | break; |
| 3574 | case MEM_ONLINE: |
| 3575 | case MEM_CANCEL_OFFLINE: |
| 3576 | break; |
| 3577 | } |
KAMEZAWA Hiroyuki | dc19f9d | 2008-12-01 13:13:48 -0800 | [diff] [blame] | 3578 | if (ret) |
| 3579 | ret = notifier_from_errno(ret); |
| 3580 | else |
| 3581 | ret = NOTIFY_OK; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3582 | return ret; |
| 3583 | } |
| 3584 | |
Andrew Morton | 3ac38fa | 2013-04-29 15:08:06 -0700 | [diff] [blame] | 3585 | static struct notifier_block slab_memory_callback_nb = { |
| 3586 | .notifier_call = slab_memory_callback, |
| 3587 | .priority = SLAB_CALLBACK_PRI, |
| 3588 | }; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3589 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3590 | /******************************************************************** |
| 3591 | * Basic setup of slabs |
| 3592 | *******************************************************************/ |
| 3593 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3594 | /* |
| 3595 | * Used for early kmem_cache structures that were allocated using |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3596 | * the page allocator. Allocate them properly then fix up the pointers |
| 3597 | * that may be pointing to the wrong kmem_cache structure. |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3598 | */ |
| 3599 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3600 | static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache) |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3601 | { |
| 3602 | int node; |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3603 | struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3604 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3605 | memcpy(s, static_cache, kmem_cache->object_size); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3606 | |
Glauber Costa | 7d557b3 | 2013-02-22 20:20:00 +0400 | [diff] [blame] | 3607 | /* |
| 3608 | * This runs very early, and only the boot processor is supposed to be |
| 3609 | * up. Even if it weren't true, IRQs are not up so we couldn't fire |
| 3610 | * IPIs around. |
| 3611 | */ |
| 3612 | __flush_cpu_slab(s, smp_processor_id()); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3613 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 3614 | struct kmem_cache_node *n = get_node(s, node); |
| 3615 | struct page *p; |
| 3616 | |
| 3617 | if (n) { |
| 3618 | list_for_each_entry(p, &n->partial, lru) |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 3619 | p->slab_cache = s; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3620 | |
Li Zefan | 607bf32 | 2011-04-12 15:22:26 +0800 | [diff] [blame] | 3621 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3622 | list_for_each_entry(p, &n->full, lru) |
Glauber Costa | 1b4f59e3 | 2012-10-22 18:05:36 +0400 | [diff] [blame] | 3623 | p->slab_cache = s; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3624 | #endif |
| 3625 | } |
| 3626 | } |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3627 | list_add(&s->list, &slab_caches); |
| 3628 | return s; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3629 | } |
| 3630 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3631 | void __init kmem_cache_init(void) |
| 3632 | { |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3633 | static __initdata struct kmem_cache boot_kmem_cache, |
| 3634 | boot_kmem_cache_node; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3635 | |
Stanislaw Gruszka | fc8d862 | 2012-01-10 15:07:32 -0800 | [diff] [blame] | 3636 | if (debug_guardpage_minorder()) |
| 3637 | slub_max_order = 0; |
| 3638 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3639 | kmem_cache_node = &boot_kmem_cache_node; |
| 3640 | kmem_cache = &boot_kmem_cache; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3641 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3642 | create_boot_cache(kmem_cache_node, "kmem_cache_node", |
| 3643 | sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3644 | |
Andrew Morton | 3ac38fa | 2013-04-29 15:08:06 -0700 | [diff] [blame] | 3645 | register_hotmemory_notifier(&slab_memory_callback_nb); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3646 | |
| 3647 | /* Able to allocate the per node structures */ |
| 3648 | slab_state = PARTIAL; |
| 3649 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3650 | create_boot_cache(kmem_cache, "kmem_cache", |
| 3651 | offsetof(struct kmem_cache, node) + |
| 3652 | nr_node_ids * sizeof(struct kmem_cache_node *), |
| 3653 | SLAB_HWCACHE_ALIGN); |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3654 | |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3655 | kmem_cache = bootstrap(&boot_kmem_cache); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3656 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3657 | /* |
| 3658 | * Allocate kmem_cache_node properly from the kmem_cache slab. |
| 3659 | * kmem_cache_node is separately allocated so no need to |
| 3660 | * update any list pointers. |
| 3661 | */ |
Christoph Lameter | dffb4d6 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3662 | kmem_cache_node = bootstrap(&boot_kmem_cache_node); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3663 | |
| 3664 | /* Now we can use the kmem_cache to allocate kmalloc slabs */ |
Christoph Lameter | f97d5f6 | 2013-01-10 19:12:17 +0000 | [diff] [blame] | 3665 | create_kmalloc_caches(0); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3666 | |
| 3667 | #ifdef CONFIG_SMP |
| 3668 | register_cpu_notifier(&slab_notifier); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 3669 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3670 | |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 3671 | printk(KERN_INFO |
Christoph Lameter | f97d5f6 | 2013-01-10 19:12:17 +0000 | [diff] [blame] | 3672 | "SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d," |
Christoph Lameter | 4b356be | 2007-06-16 10:16:13 -0700 | [diff] [blame] | 3673 | " CPUs=%d, Nodes=%d\n", |
Christoph Lameter | f97d5f6 | 2013-01-10 19:12:17 +0000 | [diff] [blame] | 3674 | cache_line_size(), |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3675 | slub_min_order, slub_max_order, slub_min_objects, |
| 3676 | nr_cpu_ids, nr_node_ids); |
| 3677 | } |
| 3678 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 3679 | void __init kmem_cache_init_late(void) |
| 3680 | { |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 3681 | } |
| 3682 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3683 | /* |
| 3684 | * Find a mergeable slab cache |
| 3685 | */ |
| 3686 | static int slab_unmergeable(struct kmem_cache *s) |
| 3687 | { |
| 3688 | if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE)) |
| 3689 | return 1; |
| 3690 | |
Christoph Lameter | c59def9 | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3691 | if (s->ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3692 | return 1; |
| 3693 | |
Christoph Lameter | 8ffa687 | 2007-05-31 00:40:51 -0700 | [diff] [blame] | 3694 | /* |
| 3695 | * We may have set a slab to be unmergeable during bootstrap. |
| 3696 | */ |
| 3697 | if (s->refcount < 0) |
| 3698 | return 1; |
| 3699 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3700 | return 0; |
| 3701 | } |
| 3702 | |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 3703 | static struct kmem_cache *find_mergeable(struct mem_cgroup *memcg, size_t size, |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3704 | size_t align, unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 3705 | void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3706 | { |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3707 | struct kmem_cache *s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3708 | |
| 3709 | if (slub_nomerge || (flags & SLUB_NEVER_MERGE)) |
| 3710 | return NULL; |
| 3711 | |
Christoph Lameter | c59def9 | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3712 | if (ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3713 | return NULL; |
| 3714 | |
| 3715 | size = ALIGN(size, sizeof(void *)); |
| 3716 | align = calculate_alignment(flags, align, size); |
| 3717 | size = ALIGN(size, align); |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3718 | flags = kmem_cache_flags(size, flags, name, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3719 | |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3720 | list_for_each_entry(s, &slab_caches, list) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3721 | if (slab_unmergeable(s)) |
| 3722 | continue; |
| 3723 | |
| 3724 | if (size > s->size) |
| 3725 | continue; |
| 3726 | |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3727 | if ((flags & SLUB_MERGE_SAME) != (s->flags & SLUB_MERGE_SAME)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3728 | continue; |
| 3729 | /* |
| 3730 | * Check if alignment is compatible. |
| 3731 | * Courtesy of Adrian Drzewiecki |
| 3732 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3733 | if ((s->size & ~(align - 1)) != s->size) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3734 | continue; |
| 3735 | |
| 3736 | if (s->size - size >= sizeof(void *)) |
| 3737 | continue; |
| 3738 | |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 3739 | if (!cache_match_memcg(s, memcg)) |
| 3740 | continue; |
| 3741 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3742 | return s; |
| 3743 | } |
| 3744 | return NULL; |
| 3745 | } |
| 3746 | |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 3747 | struct kmem_cache * |
| 3748 | __kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size, |
| 3749 | size_t align, unsigned long flags, void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3750 | { |
| 3751 | struct kmem_cache *s; |
| 3752 | |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 3753 | s = find_mergeable(memcg, size, align, flags, name, ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3754 | if (s) { |
| 3755 | s->refcount++; |
| 3756 | /* |
| 3757 | * Adjust the object sizes so that we clear |
| 3758 | * the complete object on kzalloc. |
| 3759 | */ |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 3760 | s->object_size = max(s->object_size, (int)size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3761 | s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3762 | |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3763 | if (sysfs_slab_alias(s, name)) { |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3764 | s->refcount--; |
Christoph Lameter | cbb7969 | 2012-09-05 00:18:32 +0000 | [diff] [blame] | 3765 | s = NULL; |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3766 | } |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3767 | } |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3768 | |
Christoph Lameter | cbb7969 | 2012-09-05 00:18:32 +0000 | [diff] [blame] | 3769 | return s; |
| 3770 | } |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3771 | |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 3772 | int __kmem_cache_create(struct kmem_cache *s, unsigned long flags) |
Christoph Lameter | cbb7969 | 2012-09-05 00:18:32 +0000 | [diff] [blame] | 3773 | { |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 3774 | int err; |
Christoph Lameter | 20cea96 | 2012-07-06 15:25:13 -0500 | [diff] [blame] | 3775 | |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 3776 | err = kmem_cache_open(s, flags); |
| 3777 | if (err) |
| 3778 | return err; |
Christoph Lameter | 20cea96 | 2012-07-06 15:25:13 -0500 | [diff] [blame] | 3779 | |
Christoph Lameter | 45530c4 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 3780 | /* Mutex is not taken during early boot */ |
| 3781 | if (slab_state <= UP) |
| 3782 | return 0; |
| 3783 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 3784 | memcg_propagate_slab_attrs(s); |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 3785 | mutex_unlock(&slab_mutex); |
| 3786 | err = sysfs_slab_add(s); |
| 3787 | mutex_lock(&slab_mutex); |
Christoph Lameter | 20cea96 | 2012-07-06 15:25:13 -0500 | [diff] [blame] | 3788 | |
Pekka Enberg | aac3a16 | 2012-09-05 12:07:44 +0300 | [diff] [blame] | 3789 | if (err) |
| 3790 | kmem_cache_close(s); |
| 3791 | |
| 3792 | return err; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3793 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3794 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3795 | #ifdef CONFIG_SMP |
Christoph Lameter | 27390bc | 2007-06-01 00:47:09 -0700 | [diff] [blame] | 3796 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3797 | * Use the cpu notifier to insure that the cpu slabs are flushed when |
| 3798 | * necessary. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3799 | */ |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 3800 | static int slab_cpuup_callback(struct notifier_block *nfb, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3801 | unsigned long action, void *hcpu) |
| 3802 | { |
| 3803 | long cpu = (long)hcpu; |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3804 | struct kmem_cache *s; |
| 3805 | unsigned long flags; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3806 | |
| 3807 | switch (action) { |
| 3808 | case CPU_UP_CANCELED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 3809 | case CPU_UP_CANCELED_FROZEN: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3810 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 3811 | case CPU_DEAD_FROZEN: |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3812 | mutex_lock(&slab_mutex); |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3813 | list_for_each_entry(s, &slab_caches, list) { |
| 3814 | local_irq_save(flags); |
| 3815 | __flush_cpu_slab(s, cpu); |
| 3816 | local_irq_restore(flags); |
| 3817 | } |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 3818 | mutex_unlock(&slab_mutex); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3819 | break; |
| 3820 | default: |
| 3821 | break; |
| 3822 | } |
| 3823 | return NOTIFY_OK; |
| 3824 | } |
| 3825 | |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 3826 | static struct notifier_block slab_notifier = { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 3827 | .notifier_call = slab_cpuup_callback |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3828 | }; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3829 | |
| 3830 | #endif |
| 3831 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3832 | 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] | 3833 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3834 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3835 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3836 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3837 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3838 | return kmalloc_large(size, gfpflags); |
| 3839 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3840 | s = kmalloc_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3841 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3842 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3843 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3844 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 3845 | ret = slab_alloc(s, gfpflags, caller); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3846 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3847 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3848 | trace_kmalloc(caller, ret, size, s->size, gfpflags); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3849 | |
| 3850 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3851 | } |
| 3852 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3853 | #ifdef CONFIG_NUMA |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3854 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3855 | int node, unsigned long caller) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3856 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3857 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3858 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3859 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3860 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
Xiaotian Feng | d3e14aa | 2010-04-08 17:26:44 +0800 | [diff] [blame] | 3861 | ret = kmalloc_large_node(size, gfpflags, node); |
| 3862 | |
| 3863 | trace_kmalloc_node(caller, ret, |
| 3864 | size, PAGE_SIZE << get_order(size), |
| 3865 | gfpflags, node); |
| 3866 | |
| 3867 | return ret; |
| 3868 | } |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3869 | |
Christoph Lameter | 2c59dd6 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 3870 | s = kmalloc_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3871 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3872 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3873 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3874 | |
Ezequiel Garcia | 2b847c3 | 2012-09-08 17:47:58 -0300 | [diff] [blame] | 3875 | ret = slab_alloc_node(s, gfpflags, node, caller); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3876 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3877 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3878 | trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3879 | |
| 3880 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3881 | } |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3882 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3883 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3884 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3885 | static int count_inuse(struct page *page) |
| 3886 | { |
| 3887 | return page->inuse; |
| 3888 | } |
| 3889 | |
| 3890 | static int count_total(struct page *page) |
| 3891 | { |
| 3892 | return page->objects; |
| 3893 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3894 | #endif |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3895 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3896 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3897 | static int validate_slab(struct kmem_cache *s, struct page *page, |
| 3898 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3899 | { |
| 3900 | void *p; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 3901 | void *addr = page_address(page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3902 | |
| 3903 | if (!check_slab(s, page) || |
| 3904 | !on_freelist(s, page, NULL)) |
| 3905 | return 0; |
| 3906 | |
| 3907 | /* Now we know that a valid freelist exists */ |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 3908 | bitmap_zero(map, page->objects); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3909 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 3910 | get_map(s, page, map); |
| 3911 | for_each_object(p, s, addr, page->objects) { |
| 3912 | if (test_bit(slab_index(p, s, addr), map)) |
| 3913 | if (!check_object(s, page, p, SLUB_RED_INACTIVE)) |
| 3914 | return 0; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3915 | } |
| 3916 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3917 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 3918 | if (!test_bit(slab_index(p, s, addr), map)) |
Tero Roponen | 37d5744 | 2010-12-01 20:04:20 +0200 | [diff] [blame] | 3919 | if (!check_object(s, page, p, SLUB_RED_ACTIVE)) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3920 | return 0; |
| 3921 | return 1; |
| 3922 | } |
| 3923 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3924 | static void validate_slab_slab(struct kmem_cache *s, struct page *page, |
| 3925 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3926 | { |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 3927 | slab_lock(page); |
| 3928 | validate_slab(s, page, map); |
| 3929 | slab_unlock(page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3930 | } |
| 3931 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3932 | static int validate_slab_node(struct kmem_cache *s, |
| 3933 | struct kmem_cache_node *n, unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3934 | { |
| 3935 | unsigned long count = 0; |
| 3936 | struct page *page; |
| 3937 | unsigned long flags; |
| 3938 | |
| 3939 | spin_lock_irqsave(&n->list_lock, flags); |
| 3940 | |
| 3941 | list_for_each_entry(page, &n->partial, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3942 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3943 | count++; |
| 3944 | } |
| 3945 | if (count != n->nr_partial) |
| 3946 | printk(KERN_ERR "SLUB %s: %ld partial slabs counted but " |
| 3947 | "counter=%ld\n", s->name, count, n->nr_partial); |
| 3948 | |
| 3949 | if (!(s->flags & SLAB_STORE_USER)) |
| 3950 | goto out; |
| 3951 | |
| 3952 | list_for_each_entry(page, &n->full, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3953 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3954 | count++; |
| 3955 | } |
| 3956 | if (count != atomic_long_read(&n->nr_slabs)) |
| 3957 | printk(KERN_ERR "SLUB: %s %ld slabs counted but " |
| 3958 | "counter=%ld\n", s->name, count, |
| 3959 | atomic_long_read(&n->nr_slabs)); |
| 3960 | |
| 3961 | out: |
| 3962 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 3963 | return count; |
| 3964 | } |
| 3965 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3966 | static long validate_slab_cache(struct kmem_cache *s) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3967 | { |
| 3968 | int node; |
| 3969 | unsigned long count = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3970 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3971 | sizeof(unsigned long), GFP_KERNEL); |
| 3972 | |
| 3973 | if (!map) |
| 3974 | return -ENOMEM; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3975 | |
| 3976 | flush_all(s); |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3977 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3978 | struct kmem_cache_node *n = get_node(s, node); |
| 3979 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3980 | count += validate_slab_node(s, n, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3981 | } |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3982 | kfree(map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3983 | return count; |
| 3984 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3985 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3986 | * Generate lists of code addresses where slabcache objects are allocated |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3987 | * and freed. |
| 3988 | */ |
| 3989 | |
| 3990 | struct location { |
| 3991 | unsigned long count; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3992 | unsigned long addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3993 | long long sum_time; |
| 3994 | long min_time; |
| 3995 | long max_time; |
| 3996 | long min_pid; |
| 3997 | long max_pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 3998 | DECLARE_BITMAP(cpus, NR_CPUS); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3999 | nodemask_t nodes; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4000 | }; |
| 4001 | |
| 4002 | struct loc_track { |
| 4003 | unsigned long max; |
| 4004 | unsigned long count; |
| 4005 | struct location *loc; |
| 4006 | }; |
| 4007 | |
| 4008 | static void free_loc_track(struct loc_track *t) |
| 4009 | { |
| 4010 | if (t->max) |
| 4011 | free_pages((unsigned long)t->loc, |
| 4012 | get_order(sizeof(struct location) * t->max)); |
| 4013 | } |
| 4014 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4015 | 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] | 4016 | { |
| 4017 | struct location *l; |
| 4018 | int order; |
| 4019 | |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4020 | order = get_order(sizeof(struct location) * max); |
| 4021 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4022 | l = (void *)__get_free_pages(flags, order); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4023 | if (!l) |
| 4024 | return 0; |
| 4025 | |
| 4026 | if (t->count) { |
| 4027 | memcpy(l, t->loc, sizeof(struct location) * t->count); |
| 4028 | free_loc_track(t); |
| 4029 | } |
| 4030 | t->max = max; |
| 4031 | t->loc = l; |
| 4032 | return 1; |
| 4033 | } |
| 4034 | |
| 4035 | static int add_location(struct loc_track *t, struct kmem_cache *s, |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4036 | const struct track *track) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4037 | { |
| 4038 | long start, end, pos; |
| 4039 | struct location *l; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 4040 | unsigned long caddr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4041 | unsigned long age = jiffies - track->when; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4042 | |
| 4043 | start = -1; |
| 4044 | end = t->count; |
| 4045 | |
| 4046 | for ( ; ; ) { |
| 4047 | pos = start + (end - start + 1) / 2; |
| 4048 | |
| 4049 | /* |
| 4050 | * There is nothing at "end". If we end up there |
| 4051 | * we need to add something to before end. |
| 4052 | */ |
| 4053 | if (pos == end) |
| 4054 | break; |
| 4055 | |
| 4056 | caddr = t->loc[pos].addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4057 | if (track->addr == caddr) { |
| 4058 | |
| 4059 | l = &t->loc[pos]; |
| 4060 | l->count++; |
| 4061 | if (track->when) { |
| 4062 | l->sum_time += age; |
| 4063 | if (age < l->min_time) |
| 4064 | l->min_time = age; |
| 4065 | if (age > l->max_time) |
| 4066 | l->max_time = age; |
| 4067 | |
| 4068 | if (track->pid < l->min_pid) |
| 4069 | l->min_pid = track->pid; |
| 4070 | if (track->pid > l->max_pid) |
| 4071 | l->max_pid = track->pid; |
| 4072 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4073 | cpumask_set_cpu(track->cpu, |
| 4074 | to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4075 | } |
| 4076 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4077 | return 1; |
| 4078 | } |
| 4079 | |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4080 | if (track->addr < caddr) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4081 | end = pos; |
| 4082 | else |
| 4083 | start = pos; |
| 4084 | } |
| 4085 | |
| 4086 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 4087 | * Not found. Insert new tracking element. |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4088 | */ |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4089 | 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] | 4090 | return 0; |
| 4091 | |
| 4092 | l = t->loc + pos; |
| 4093 | if (pos < t->count) |
| 4094 | memmove(l + 1, l, |
| 4095 | (t->count - pos) * sizeof(struct location)); |
| 4096 | t->count++; |
| 4097 | l->count = 1; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4098 | l->addr = track->addr; |
| 4099 | l->sum_time = age; |
| 4100 | l->min_time = age; |
| 4101 | l->max_time = age; |
| 4102 | l->min_pid = track->pid; |
| 4103 | l->max_pid = track->pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4104 | cpumask_clear(to_cpumask(l->cpus)); |
| 4105 | cpumask_set_cpu(track->cpu, to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4106 | nodes_clear(l->nodes); |
| 4107 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4108 | return 1; |
| 4109 | } |
| 4110 | |
| 4111 | static void process_slab(struct loc_track *t, struct kmem_cache *s, |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4112 | struct page *page, enum track_item alloc, |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 4113 | unsigned long *map) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4114 | { |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 4115 | void *addr = page_address(page); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4116 | void *p; |
| 4117 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 4118 | bitmap_zero(map, page->objects); |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 4119 | get_map(s, page, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4120 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4121 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4122 | if (!test_bit(slab_index(p, s, addr), map)) |
| 4123 | add_location(t, s, get_track(s, p, alloc)); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4124 | } |
| 4125 | |
| 4126 | static int list_locations(struct kmem_cache *s, char *buf, |
| 4127 | enum track_item alloc) |
| 4128 | { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4129 | int len = 0; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4130 | unsigned long i; |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4131 | struct loc_track t = { 0, 0, NULL }; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4132 | int node; |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4133 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
| 4134 | sizeof(unsigned long), GFP_KERNEL); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4135 | |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4136 | if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location), |
| 4137 | GFP_TEMPORARY)) { |
| 4138 | kfree(map); |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4139 | return sprintf(buf, "Out of memory\n"); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4140 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4141 | /* Push back cpu slabs */ |
| 4142 | flush_all(s); |
| 4143 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 4144 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4145 | struct kmem_cache_node *n = get_node(s, node); |
| 4146 | unsigned long flags; |
| 4147 | struct page *page; |
| 4148 | |
Christoph Lameter | 9e86943 | 2007-08-22 14:01:56 -0700 | [diff] [blame] | 4149 | if (!atomic_long_read(&n->nr_slabs)) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4150 | continue; |
| 4151 | |
| 4152 | spin_lock_irqsave(&n->list_lock, flags); |
| 4153 | list_for_each_entry(page, &n->partial, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4154 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4155 | list_for_each_entry(page, &n->full, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4156 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4157 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 4158 | } |
| 4159 | |
| 4160 | for (i = 0; i < t.count; i++) { |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4161 | struct location *l = &t.loc[i]; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4162 | |
Hugh Dickins | 9c24624 | 2008-12-09 13:14:27 -0800 | [diff] [blame] | 4163 | if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4164 | break; |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4165 | len += sprintf(buf + len, "%7ld ", l->count); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4166 | |
| 4167 | if (l->addr) |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4168 | len += sprintf(buf + len, "%pS", (void *)l->addr); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4169 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4170 | len += sprintf(buf + len, "<not-available>"); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4171 | |
| 4172 | if (l->sum_time != l->min_time) { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4173 | len += sprintf(buf + len, " age=%ld/%ld/%ld", |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 4174 | l->min_time, |
| 4175 | (long)div_u64(l->sum_time, l->count), |
| 4176 | l->max_time); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4177 | } else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4178 | len += sprintf(buf + len, " age=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4179 | l->min_time); |
| 4180 | |
| 4181 | if (l->min_pid != l->max_pid) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4182 | len += sprintf(buf + len, " pid=%ld-%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4183 | l->min_pid, l->max_pid); |
| 4184 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4185 | len += sprintf(buf + len, " pid=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4186 | l->min_pid); |
| 4187 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4188 | if (num_online_cpus() > 1 && |
| 4189 | !cpumask_empty(to_cpumask(l->cpus)) && |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4190 | len < PAGE_SIZE - 60) { |
| 4191 | len += sprintf(buf + len, " cpus="); |
| 4192 | len += cpulist_scnprintf(buf + len, PAGE_SIZE - len - 50, |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4193 | to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4194 | } |
| 4195 | |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 4196 | if (nr_online_nodes > 1 && !nodes_empty(l->nodes) && |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4197 | len < PAGE_SIZE - 60) { |
| 4198 | len += sprintf(buf + len, " nodes="); |
| 4199 | len += nodelist_scnprintf(buf + len, PAGE_SIZE - len - 50, |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4200 | l->nodes); |
| 4201 | } |
| 4202 | |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4203 | len += sprintf(buf + len, "\n"); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4204 | } |
| 4205 | |
| 4206 | free_loc_track(&t); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4207 | kfree(map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4208 | if (!t.count) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4209 | len += sprintf(buf, "No data\n"); |
| 4210 | return len; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4211 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4212 | #endif |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4213 | |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4214 | #ifdef SLUB_RESILIENCY_TEST |
| 4215 | static void resiliency_test(void) |
| 4216 | { |
| 4217 | u8 *p; |
| 4218 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 4219 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || KMALLOC_SHIFT_HIGH < 10); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4220 | |
| 4221 | printk(KERN_ERR "SLUB resiliency testing\n"); |
| 4222 | printk(KERN_ERR "-----------------------\n"); |
| 4223 | printk(KERN_ERR "A. Corruption after allocation\n"); |
| 4224 | |
| 4225 | p = kzalloc(16, GFP_KERNEL); |
| 4226 | p[16] = 0x12; |
| 4227 | printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer" |
| 4228 | " 0x12->0x%p\n\n", p + 16); |
| 4229 | |
| 4230 | validate_slab_cache(kmalloc_caches[4]); |
| 4231 | |
| 4232 | /* Hmmm... The next two are dangerous */ |
| 4233 | p = kzalloc(32, GFP_KERNEL); |
| 4234 | p[32 + sizeof(void *)] = 0x34; |
| 4235 | printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab" |
| 4236 | " 0x34 -> -0x%p\n", p); |
| 4237 | printk(KERN_ERR |
| 4238 | "If allocated object is overwritten then not detectable\n\n"); |
| 4239 | |
| 4240 | validate_slab_cache(kmalloc_caches[5]); |
| 4241 | p = kzalloc(64, GFP_KERNEL); |
| 4242 | p += 64 + (get_cycles() & 0xff) * sizeof(void *); |
| 4243 | *p = 0x56; |
| 4244 | printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n", |
| 4245 | p); |
| 4246 | printk(KERN_ERR |
| 4247 | "If allocated object is overwritten then not detectable\n\n"); |
| 4248 | validate_slab_cache(kmalloc_caches[6]); |
| 4249 | |
| 4250 | printk(KERN_ERR "\nB. Corruption after free\n"); |
| 4251 | p = kzalloc(128, GFP_KERNEL); |
| 4252 | kfree(p); |
| 4253 | *p = 0x78; |
| 4254 | printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p); |
| 4255 | validate_slab_cache(kmalloc_caches[7]); |
| 4256 | |
| 4257 | p = kzalloc(256, GFP_KERNEL); |
| 4258 | kfree(p); |
| 4259 | p[50] = 0x9a; |
| 4260 | printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", |
| 4261 | p); |
| 4262 | validate_slab_cache(kmalloc_caches[8]); |
| 4263 | |
| 4264 | p = kzalloc(512, GFP_KERNEL); |
| 4265 | kfree(p); |
| 4266 | p[512] = 0xab; |
| 4267 | printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p); |
| 4268 | validate_slab_cache(kmalloc_caches[9]); |
| 4269 | } |
| 4270 | #else |
| 4271 | #ifdef CONFIG_SYSFS |
| 4272 | static void resiliency_test(void) {}; |
| 4273 | #endif |
| 4274 | #endif |
| 4275 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4276 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4277 | enum slab_stat_type { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4278 | SL_ALL, /* All slabs */ |
| 4279 | SL_PARTIAL, /* Only partially allocated slabs */ |
| 4280 | SL_CPU, /* Only slabs used for cpu caches */ |
| 4281 | SL_OBJECTS, /* Determine allocated objects not slabs */ |
| 4282 | SL_TOTAL /* Determine object capacity not slabs */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4283 | }; |
| 4284 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4285 | #define SO_ALL (1 << SL_ALL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4286 | #define SO_PARTIAL (1 << SL_PARTIAL) |
| 4287 | #define SO_CPU (1 << SL_CPU) |
| 4288 | #define SO_OBJECTS (1 << SL_OBJECTS) |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4289 | #define SO_TOTAL (1 << SL_TOTAL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4290 | |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4291 | static ssize_t show_slab_objects(struct kmem_cache *s, |
| 4292 | char *buf, unsigned long flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4293 | { |
| 4294 | unsigned long total = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4295 | int node; |
| 4296 | int x; |
| 4297 | unsigned long *nodes; |
| 4298 | unsigned long *per_cpu; |
| 4299 | |
| 4300 | nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL); |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4301 | if (!nodes) |
| 4302 | return -ENOMEM; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4303 | per_cpu = nodes + nr_node_ids; |
| 4304 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4305 | if (flags & SO_CPU) { |
| 4306 | int cpu; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4307 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4308 | for_each_possible_cpu(cpu) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4309 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4310 | int node; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4311 | struct page *page; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4312 | |
Eric Dumazet | bc6697d | 2011-11-22 16:02:02 +0100 | [diff] [blame] | 4313 | page = ACCESS_ONCE(c->page); |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4314 | if (!page) |
| 4315 | continue; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4316 | |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4317 | node = page_to_nid(page); |
| 4318 | if (flags & SO_TOTAL) |
| 4319 | x = page->objects; |
| 4320 | else if (flags & SO_OBJECTS) |
| 4321 | x = page->inuse; |
| 4322 | else |
| 4323 | x = 1; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4324 | |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4325 | total += x; |
| 4326 | nodes[node] += x; |
| 4327 | |
| 4328 | page = ACCESS_ONCE(c->partial); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4329 | if (page) { |
| 4330 | x = page->pobjects; |
Eric Dumazet | bc6697d | 2011-11-22 16:02:02 +0100 | [diff] [blame] | 4331 | total += x; |
| 4332 | nodes[node] += x; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4333 | } |
Christoph Lameter | ec3ab08 | 2012-05-09 10:09:56 -0500 | [diff] [blame] | 4334 | |
Eric Dumazet | bc6697d | 2011-11-22 16:02:02 +0100 | [diff] [blame] | 4335 | per_cpu[node]++; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4336 | } |
| 4337 | } |
| 4338 | |
Christoph Lameter | 04d9487 | 2011-01-10 10:15:15 -0600 | [diff] [blame] | 4339 | lock_memory_hotplug(); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4340 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4341 | if (flags & SO_ALL) { |
| 4342 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 4343 | struct kmem_cache_node *n = get_node(s, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4344 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4345 | if (flags & SO_TOTAL) |
| 4346 | x = atomic_long_read(&n->total_objects); |
| 4347 | else if (flags & SO_OBJECTS) |
| 4348 | x = atomic_long_read(&n->total_objects) - |
| 4349 | count_partial(n, count_free); |
| 4350 | |
| 4351 | else |
| 4352 | x = atomic_long_read(&n->nr_slabs); |
| 4353 | total += x; |
| 4354 | nodes[node] += x; |
| 4355 | } |
| 4356 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4357 | } else |
| 4358 | #endif |
| 4359 | if (flags & SO_PARTIAL) { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4360 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 4361 | struct kmem_cache_node *n = get_node(s, node); |
| 4362 | |
| 4363 | if (flags & SO_TOTAL) |
| 4364 | x = count_partial(n, count_total); |
| 4365 | else if (flags & SO_OBJECTS) |
| 4366 | x = count_partial(n, count_inuse); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4367 | else |
| 4368 | x = n->nr_partial; |
| 4369 | total += x; |
| 4370 | nodes[node] += x; |
| 4371 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4372 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4373 | x = sprintf(buf, "%lu", total); |
| 4374 | #ifdef CONFIG_NUMA |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 4375 | for_each_node_state(node, N_NORMAL_MEMORY) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4376 | if (nodes[node]) |
| 4377 | x += sprintf(buf + x, " N%d=%lu", |
| 4378 | node, nodes[node]); |
| 4379 | #endif |
Christoph Lameter | 04d9487 | 2011-01-10 10:15:15 -0600 | [diff] [blame] | 4380 | unlock_memory_hotplug(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4381 | kfree(nodes); |
| 4382 | return x + sprintf(buf + x, "\n"); |
| 4383 | } |
| 4384 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4385 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4386 | static int any_slab_objects(struct kmem_cache *s) |
| 4387 | { |
| 4388 | int node; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4389 | |
| 4390 | for_each_online_node(node) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4391 | struct kmem_cache_node *n = get_node(s, node); |
| 4392 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4393 | if (!n) |
| 4394 | continue; |
| 4395 | |
Benjamin Herrenschmidt | 4ea33e2 | 2008-05-06 20:42:39 -0700 | [diff] [blame] | 4396 | if (atomic_long_read(&n->total_objects)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4397 | return 1; |
| 4398 | } |
| 4399 | return 0; |
| 4400 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4401 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4402 | |
| 4403 | #define to_slab_attr(n) container_of(n, struct slab_attribute, attr) |
Phil Carmody | 497888c | 2011-07-14 15:07:13 +0300 | [diff] [blame] | 4404 | #define to_slab(n) container_of(n, struct kmem_cache, kobj) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4405 | |
| 4406 | struct slab_attribute { |
| 4407 | struct attribute attr; |
| 4408 | ssize_t (*show)(struct kmem_cache *s, char *buf); |
| 4409 | ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count); |
| 4410 | }; |
| 4411 | |
| 4412 | #define SLAB_ATTR_RO(_name) \ |
Vasiliy Kulikov | ab067e9 | 2011-09-27 21:54:53 +0400 | [diff] [blame] | 4413 | static struct slab_attribute _name##_attr = \ |
| 4414 | __ATTR(_name, 0400, _name##_show, NULL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4415 | |
| 4416 | #define SLAB_ATTR(_name) \ |
| 4417 | static struct slab_attribute _name##_attr = \ |
Vasiliy Kulikov | ab067e9 | 2011-09-27 21:54:53 +0400 | [diff] [blame] | 4418 | __ATTR(_name, 0600, _name##_show, _name##_store) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4419 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4420 | static ssize_t slab_size_show(struct kmem_cache *s, char *buf) |
| 4421 | { |
| 4422 | return sprintf(buf, "%d\n", s->size); |
| 4423 | } |
| 4424 | SLAB_ATTR_RO(slab_size); |
| 4425 | |
| 4426 | static ssize_t align_show(struct kmem_cache *s, char *buf) |
| 4427 | { |
| 4428 | return sprintf(buf, "%d\n", s->align); |
| 4429 | } |
| 4430 | SLAB_ATTR_RO(align); |
| 4431 | |
| 4432 | static ssize_t object_size_show(struct kmem_cache *s, char *buf) |
| 4433 | { |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 4434 | return sprintf(buf, "%d\n", s->object_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4435 | } |
| 4436 | SLAB_ATTR_RO(object_size); |
| 4437 | |
| 4438 | static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf) |
| 4439 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4440 | return sprintf(buf, "%d\n", oo_objects(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4441 | } |
| 4442 | SLAB_ATTR_RO(objs_per_slab); |
| 4443 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4444 | static ssize_t order_store(struct kmem_cache *s, |
| 4445 | const char *buf, size_t length) |
| 4446 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4447 | unsigned long order; |
| 4448 | int err; |
| 4449 | |
| 4450 | err = strict_strtoul(buf, 10, &order); |
| 4451 | if (err) |
| 4452 | return err; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4453 | |
| 4454 | if (order > slub_max_order || order < slub_min_order) |
| 4455 | return -EINVAL; |
| 4456 | |
| 4457 | calculate_sizes(s, order); |
| 4458 | return length; |
| 4459 | } |
| 4460 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4461 | static ssize_t order_show(struct kmem_cache *s, char *buf) |
| 4462 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4463 | return sprintf(buf, "%d\n", oo_order(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4464 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4465 | SLAB_ATTR(order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4466 | |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4467 | static ssize_t min_partial_show(struct kmem_cache *s, char *buf) |
| 4468 | { |
| 4469 | return sprintf(buf, "%lu\n", s->min_partial); |
| 4470 | } |
| 4471 | |
| 4472 | static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, |
| 4473 | size_t length) |
| 4474 | { |
| 4475 | unsigned long min; |
| 4476 | int err; |
| 4477 | |
| 4478 | err = strict_strtoul(buf, 10, &min); |
| 4479 | if (err) |
| 4480 | return err; |
| 4481 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 4482 | set_min_partial(s, min); |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4483 | return length; |
| 4484 | } |
| 4485 | SLAB_ATTR(min_partial); |
| 4486 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4487 | static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf) |
| 4488 | { |
| 4489 | return sprintf(buf, "%u\n", s->cpu_partial); |
| 4490 | } |
| 4491 | |
| 4492 | static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf, |
| 4493 | size_t length) |
| 4494 | { |
| 4495 | unsigned long objects; |
| 4496 | int err; |
| 4497 | |
| 4498 | err = strict_strtoul(buf, 10, &objects); |
| 4499 | if (err) |
| 4500 | return err; |
Joonsoo Kim | 345c905 | 2013-06-19 14:05:52 +0900 | [diff] [blame] | 4501 | if (objects && !kmem_cache_has_cpu_partial(s)) |
David Rientjes | 74ee4ef | 2012-01-09 13:19:45 -0800 | [diff] [blame] | 4502 | return -EINVAL; |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4503 | |
| 4504 | s->cpu_partial = objects; |
| 4505 | flush_all(s); |
| 4506 | return length; |
| 4507 | } |
| 4508 | SLAB_ATTR(cpu_partial); |
| 4509 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4510 | static ssize_t ctor_show(struct kmem_cache *s, char *buf) |
| 4511 | { |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4512 | if (!s->ctor) |
| 4513 | return 0; |
| 4514 | return sprintf(buf, "%pS\n", s->ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4515 | } |
| 4516 | SLAB_ATTR_RO(ctor); |
| 4517 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4518 | static ssize_t aliases_show(struct kmem_cache *s, char *buf) |
| 4519 | { |
| 4520 | return sprintf(buf, "%d\n", s->refcount - 1); |
| 4521 | } |
| 4522 | SLAB_ATTR_RO(aliases); |
| 4523 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4524 | static ssize_t partial_show(struct kmem_cache *s, char *buf) |
| 4525 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4526 | return show_slab_objects(s, buf, SO_PARTIAL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4527 | } |
| 4528 | SLAB_ATTR_RO(partial); |
| 4529 | |
| 4530 | static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf) |
| 4531 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4532 | return show_slab_objects(s, buf, SO_CPU); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4533 | } |
| 4534 | SLAB_ATTR_RO(cpu_slabs); |
| 4535 | |
| 4536 | static ssize_t objects_show(struct kmem_cache *s, char *buf) |
| 4537 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4538 | return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4539 | } |
| 4540 | SLAB_ATTR_RO(objects); |
| 4541 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4542 | static ssize_t objects_partial_show(struct kmem_cache *s, char *buf) |
| 4543 | { |
| 4544 | return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS); |
| 4545 | } |
| 4546 | SLAB_ATTR_RO(objects_partial); |
| 4547 | |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4548 | static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) |
| 4549 | { |
| 4550 | int objects = 0; |
| 4551 | int pages = 0; |
| 4552 | int cpu; |
| 4553 | int len; |
| 4554 | |
| 4555 | for_each_online_cpu(cpu) { |
| 4556 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu)->partial; |
| 4557 | |
| 4558 | if (page) { |
| 4559 | pages += page->pages; |
| 4560 | objects += page->pobjects; |
| 4561 | } |
| 4562 | } |
| 4563 | |
| 4564 | len = sprintf(buf, "%d(%d)", objects, pages); |
| 4565 | |
| 4566 | #ifdef CONFIG_SMP |
| 4567 | for_each_online_cpu(cpu) { |
| 4568 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu) ->partial; |
| 4569 | |
| 4570 | if (page && len < PAGE_SIZE - 20) |
| 4571 | len += sprintf(buf + len, " C%d=%d(%d)", cpu, |
| 4572 | page->pobjects, page->pages); |
| 4573 | } |
| 4574 | #endif |
| 4575 | return len + sprintf(buf + len, "\n"); |
| 4576 | } |
| 4577 | SLAB_ATTR_RO(slabs_cpu_partial); |
| 4578 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4579 | static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf) |
| 4580 | { |
| 4581 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT)); |
| 4582 | } |
| 4583 | |
| 4584 | static ssize_t reclaim_account_store(struct kmem_cache *s, |
| 4585 | const char *buf, size_t length) |
| 4586 | { |
| 4587 | s->flags &= ~SLAB_RECLAIM_ACCOUNT; |
| 4588 | if (buf[0] == '1') |
| 4589 | s->flags |= SLAB_RECLAIM_ACCOUNT; |
| 4590 | return length; |
| 4591 | } |
| 4592 | SLAB_ATTR(reclaim_account); |
| 4593 | |
| 4594 | static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf) |
| 4595 | { |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 4596 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4597 | } |
| 4598 | SLAB_ATTR_RO(hwcache_align); |
| 4599 | |
| 4600 | #ifdef CONFIG_ZONE_DMA |
| 4601 | static ssize_t cache_dma_show(struct kmem_cache *s, char *buf) |
| 4602 | { |
| 4603 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA)); |
| 4604 | } |
| 4605 | SLAB_ATTR_RO(cache_dma); |
| 4606 | #endif |
| 4607 | |
| 4608 | static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf) |
| 4609 | { |
| 4610 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU)); |
| 4611 | } |
| 4612 | SLAB_ATTR_RO(destroy_by_rcu); |
| 4613 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 4614 | static ssize_t reserved_show(struct kmem_cache *s, char *buf) |
| 4615 | { |
| 4616 | return sprintf(buf, "%d\n", s->reserved); |
| 4617 | } |
| 4618 | SLAB_ATTR_RO(reserved); |
| 4619 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4620 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4621 | static ssize_t slabs_show(struct kmem_cache *s, char *buf) |
| 4622 | { |
| 4623 | return show_slab_objects(s, buf, SO_ALL); |
| 4624 | } |
| 4625 | SLAB_ATTR_RO(slabs); |
| 4626 | |
| 4627 | static ssize_t total_objects_show(struct kmem_cache *s, char *buf) |
| 4628 | { |
| 4629 | return show_slab_objects(s, buf, SO_ALL|SO_TOTAL); |
| 4630 | } |
| 4631 | SLAB_ATTR_RO(total_objects); |
| 4632 | |
| 4633 | static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf) |
| 4634 | { |
| 4635 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DEBUG_FREE)); |
| 4636 | } |
| 4637 | |
| 4638 | static ssize_t sanity_checks_store(struct kmem_cache *s, |
| 4639 | const char *buf, size_t length) |
| 4640 | { |
| 4641 | s->flags &= ~SLAB_DEBUG_FREE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4642 | if (buf[0] == '1') { |
| 4643 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4644 | s->flags |= SLAB_DEBUG_FREE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4645 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4646 | return length; |
| 4647 | } |
| 4648 | SLAB_ATTR(sanity_checks); |
| 4649 | |
| 4650 | static ssize_t trace_show(struct kmem_cache *s, char *buf) |
| 4651 | { |
| 4652 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE)); |
| 4653 | } |
| 4654 | |
| 4655 | static ssize_t trace_store(struct kmem_cache *s, const char *buf, |
| 4656 | size_t length) |
| 4657 | { |
| 4658 | s->flags &= ~SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4659 | if (buf[0] == '1') { |
| 4660 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4661 | s->flags |= SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4662 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4663 | return length; |
| 4664 | } |
| 4665 | SLAB_ATTR(trace); |
| 4666 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4667 | static ssize_t red_zone_show(struct kmem_cache *s, char *buf) |
| 4668 | { |
| 4669 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE)); |
| 4670 | } |
| 4671 | |
| 4672 | static ssize_t red_zone_store(struct kmem_cache *s, |
| 4673 | const char *buf, size_t length) |
| 4674 | { |
| 4675 | if (any_slab_objects(s)) |
| 4676 | return -EBUSY; |
| 4677 | |
| 4678 | s->flags &= ~SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4679 | if (buf[0] == '1') { |
| 4680 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4681 | s->flags |= SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4682 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4683 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4684 | return length; |
| 4685 | } |
| 4686 | SLAB_ATTR(red_zone); |
| 4687 | |
| 4688 | static ssize_t poison_show(struct kmem_cache *s, char *buf) |
| 4689 | { |
| 4690 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON)); |
| 4691 | } |
| 4692 | |
| 4693 | static ssize_t poison_store(struct kmem_cache *s, |
| 4694 | const char *buf, size_t length) |
| 4695 | { |
| 4696 | if (any_slab_objects(s)) |
| 4697 | return -EBUSY; |
| 4698 | |
| 4699 | s->flags &= ~SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4700 | if (buf[0] == '1') { |
| 4701 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4702 | s->flags |= SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4703 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4704 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4705 | return length; |
| 4706 | } |
| 4707 | SLAB_ATTR(poison); |
| 4708 | |
| 4709 | static ssize_t store_user_show(struct kmem_cache *s, char *buf) |
| 4710 | { |
| 4711 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER)); |
| 4712 | } |
| 4713 | |
| 4714 | static ssize_t store_user_store(struct kmem_cache *s, |
| 4715 | const char *buf, size_t length) |
| 4716 | { |
| 4717 | if (any_slab_objects(s)) |
| 4718 | return -EBUSY; |
| 4719 | |
| 4720 | s->flags &= ~SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4721 | if (buf[0] == '1') { |
| 4722 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4723 | s->flags |= SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4724 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4725 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4726 | return length; |
| 4727 | } |
| 4728 | SLAB_ATTR(store_user); |
| 4729 | |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4730 | static ssize_t validate_show(struct kmem_cache *s, char *buf) |
| 4731 | { |
| 4732 | return 0; |
| 4733 | } |
| 4734 | |
| 4735 | static ssize_t validate_store(struct kmem_cache *s, |
| 4736 | const char *buf, size_t length) |
| 4737 | { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4738 | int ret = -EINVAL; |
| 4739 | |
| 4740 | if (buf[0] == '1') { |
| 4741 | ret = validate_slab_cache(s); |
| 4742 | if (ret >= 0) |
| 4743 | ret = length; |
| 4744 | } |
| 4745 | return ret; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4746 | } |
| 4747 | SLAB_ATTR(validate); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4748 | |
| 4749 | static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf) |
| 4750 | { |
| 4751 | if (!(s->flags & SLAB_STORE_USER)) |
| 4752 | return -ENOSYS; |
| 4753 | return list_locations(s, buf, TRACK_ALLOC); |
| 4754 | } |
| 4755 | SLAB_ATTR_RO(alloc_calls); |
| 4756 | |
| 4757 | static ssize_t free_calls_show(struct kmem_cache *s, char *buf) |
| 4758 | { |
| 4759 | if (!(s->flags & SLAB_STORE_USER)) |
| 4760 | return -ENOSYS; |
| 4761 | return list_locations(s, buf, TRACK_FREE); |
| 4762 | } |
| 4763 | SLAB_ATTR_RO(free_calls); |
| 4764 | #endif /* CONFIG_SLUB_DEBUG */ |
| 4765 | |
| 4766 | #ifdef CONFIG_FAILSLAB |
| 4767 | static ssize_t failslab_show(struct kmem_cache *s, char *buf) |
| 4768 | { |
| 4769 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB)); |
| 4770 | } |
| 4771 | |
| 4772 | static ssize_t failslab_store(struct kmem_cache *s, const char *buf, |
| 4773 | size_t length) |
| 4774 | { |
| 4775 | s->flags &= ~SLAB_FAILSLAB; |
| 4776 | if (buf[0] == '1') |
| 4777 | s->flags |= SLAB_FAILSLAB; |
| 4778 | return length; |
| 4779 | } |
| 4780 | SLAB_ATTR(failslab); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4781 | #endif |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4782 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 4783 | static ssize_t shrink_show(struct kmem_cache *s, char *buf) |
| 4784 | { |
| 4785 | return 0; |
| 4786 | } |
| 4787 | |
| 4788 | static ssize_t shrink_store(struct kmem_cache *s, |
| 4789 | const char *buf, size_t length) |
| 4790 | { |
| 4791 | if (buf[0] == '1') { |
| 4792 | int rc = kmem_cache_shrink(s); |
| 4793 | |
| 4794 | if (rc) |
| 4795 | return rc; |
| 4796 | } else |
| 4797 | return -EINVAL; |
| 4798 | return length; |
| 4799 | } |
| 4800 | SLAB_ATTR(shrink); |
| 4801 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4802 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4803 | 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] | 4804 | { |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4805 | return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4806 | } |
| 4807 | |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4808 | static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4809 | const char *buf, size_t length) |
| 4810 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4811 | unsigned long ratio; |
| 4812 | int err; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4813 | |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4814 | err = strict_strtoul(buf, 10, &ratio); |
| 4815 | if (err) |
| 4816 | return err; |
| 4817 | |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 4818 | if (ratio <= 100) |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4819 | s->remote_node_defrag_ratio = ratio * 10; |
| 4820 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4821 | return length; |
| 4822 | } |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4823 | SLAB_ATTR(remote_node_defrag_ratio); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4824 | #endif |
| 4825 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4826 | #ifdef CONFIG_SLUB_STATS |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4827 | static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) |
| 4828 | { |
| 4829 | unsigned long sum = 0; |
| 4830 | int cpu; |
| 4831 | int len; |
| 4832 | int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL); |
| 4833 | |
| 4834 | if (!data) |
| 4835 | return -ENOMEM; |
| 4836 | |
| 4837 | for_each_online_cpu(cpu) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4838 | unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4839 | |
| 4840 | data[cpu] = x; |
| 4841 | sum += x; |
| 4842 | } |
| 4843 | |
| 4844 | len = sprintf(buf, "%lu", sum); |
| 4845 | |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4846 | #ifdef CONFIG_SMP |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4847 | for_each_online_cpu(cpu) { |
| 4848 | if (data[cpu] && len < PAGE_SIZE - 20) |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4849 | len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4850 | } |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4851 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4852 | kfree(data); |
| 4853 | return len + sprintf(buf + len, "\n"); |
| 4854 | } |
| 4855 | |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4856 | static void clear_stat(struct kmem_cache *s, enum stat_item si) |
| 4857 | { |
| 4858 | int cpu; |
| 4859 | |
| 4860 | for_each_online_cpu(cpu) |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4861 | per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4862 | } |
| 4863 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4864 | #define STAT_ATTR(si, text) \ |
| 4865 | static ssize_t text##_show(struct kmem_cache *s, char *buf) \ |
| 4866 | { \ |
| 4867 | return show_stat(s, buf, si); \ |
| 4868 | } \ |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4869 | static ssize_t text##_store(struct kmem_cache *s, \ |
| 4870 | const char *buf, size_t length) \ |
| 4871 | { \ |
| 4872 | if (buf[0] != '0') \ |
| 4873 | return -EINVAL; \ |
| 4874 | clear_stat(s, si); \ |
| 4875 | return length; \ |
| 4876 | } \ |
| 4877 | SLAB_ATTR(text); \ |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4878 | |
| 4879 | STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); |
| 4880 | STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); |
| 4881 | STAT_ATTR(FREE_FASTPATH, free_fastpath); |
| 4882 | STAT_ATTR(FREE_SLOWPATH, free_slowpath); |
| 4883 | STAT_ATTR(FREE_FROZEN, free_frozen); |
| 4884 | STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); |
| 4885 | STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); |
| 4886 | STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); |
| 4887 | STAT_ATTR(ALLOC_SLAB, alloc_slab); |
| 4888 | STAT_ATTR(ALLOC_REFILL, alloc_refill); |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 4889 | STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4890 | STAT_ATTR(FREE_SLAB, free_slab); |
| 4891 | STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); |
| 4892 | STAT_ATTR(DEACTIVATE_FULL, deactivate_full); |
| 4893 | STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); |
| 4894 | STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); |
| 4895 | STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); |
| 4896 | STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 4897 | STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4898 | STAT_ATTR(ORDER_FALLBACK, order_fallback); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4899 | STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail); |
| 4900 | STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail); |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4901 | STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc); |
| 4902 | STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free); |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 4903 | STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node); |
| 4904 | STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4905 | #endif |
| 4906 | |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 4907 | static struct attribute *slab_attrs[] = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4908 | &slab_size_attr.attr, |
| 4909 | &object_size_attr.attr, |
| 4910 | &objs_per_slab_attr.attr, |
| 4911 | &order_attr.attr, |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4912 | &min_partial_attr.attr, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4913 | &cpu_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4914 | &objects_attr.attr, |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4915 | &objects_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4916 | &partial_attr.attr, |
| 4917 | &cpu_slabs_attr.attr, |
| 4918 | &ctor_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4919 | &aliases_attr.attr, |
| 4920 | &align_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4921 | &hwcache_align_attr.attr, |
| 4922 | &reclaim_account_attr.attr, |
| 4923 | &destroy_by_rcu_attr.attr, |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4924 | &shrink_attr.attr, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 4925 | &reserved_attr.attr, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4926 | &slabs_cpu_partial_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4927 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4928 | &total_objects_attr.attr, |
| 4929 | &slabs_attr.attr, |
| 4930 | &sanity_checks_attr.attr, |
| 4931 | &trace_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4932 | &red_zone_attr.attr, |
| 4933 | &poison_attr.attr, |
| 4934 | &store_user_attr.attr, |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4935 | &validate_attr.attr, |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4936 | &alloc_calls_attr.attr, |
| 4937 | &free_calls_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4938 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4939 | #ifdef CONFIG_ZONE_DMA |
| 4940 | &cache_dma_attr.attr, |
| 4941 | #endif |
| 4942 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4943 | &remote_node_defrag_ratio_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4944 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4945 | #ifdef CONFIG_SLUB_STATS |
| 4946 | &alloc_fastpath_attr.attr, |
| 4947 | &alloc_slowpath_attr.attr, |
| 4948 | &free_fastpath_attr.attr, |
| 4949 | &free_slowpath_attr.attr, |
| 4950 | &free_frozen_attr.attr, |
| 4951 | &free_add_partial_attr.attr, |
| 4952 | &free_remove_partial_attr.attr, |
| 4953 | &alloc_from_partial_attr.attr, |
| 4954 | &alloc_slab_attr.attr, |
| 4955 | &alloc_refill_attr.attr, |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 4956 | &alloc_node_mismatch_attr.attr, |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4957 | &free_slab_attr.attr, |
| 4958 | &cpuslab_flush_attr.attr, |
| 4959 | &deactivate_full_attr.attr, |
| 4960 | &deactivate_empty_attr.attr, |
| 4961 | &deactivate_to_head_attr.attr, |
| 4962 | &deactivate_to_tail_attr.attr, |
| 4963 | &deactivate_remote_frees_attr.attr, |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 4964 | &deactivate_bypass_attr.attr, |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4965 | &order_fallback_attr.attr, |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4966 | &cmpxchg_double_fail_attr.attr, |
| 4967 | &cmpxchg_double_cpu_fail_attr.attr, |
Christoph Lameter | 49e2258 | 2011-08-09 16:12:27 -0500 | [diff] [blame] | 4968 | &cpu_partial_alloc_attr.attr, |
| 4969 | &cpu_partial_free_attr.attr, |
Alex Shi | 8028dce | 2012-02-03 23:34:56 +0800 | [diff] [blame] | 4970 | &cpu_partial_node_attr.attr, |
| 4971 | &cpu_partial_drain_attr.attr, |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4972 | #endif |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 4973 | #ifdef CONFIG_FAILSLAB |
| 4974 | &failslab_attr.attr, |
| 4975 | #endif |
| 4976 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4977 | NULL |
| 4978 | }; |
| 4979 | |
| 4980 | static struct attribute_group slab_attr_group = { |
| 4981 | .attrs = slab_attrs, |
| 4982 | }; |
| 4983 | |
| 4984 | static ssize_t slab_attr_show(struct kobject *kobj, |
| 4985 | struct attribute *attr, |
| 4986 | char *buf) |
| 4987 | { |
| 4988 | struct slab_attribute *attribute; |
| 4989 | struct kmem_cache *s; |
| 4990 | int err; |
| 4991 | |
| 4992 | attribute = to_slab_attr(attr); |
| 4993 | s = to_slab(kobj); |
| 4994 | |
| 4995 | if (!attribute->show) |
| 4996 | return -EIO; |
| 4997 | |
| 4998 | err = attribute->show(s, buf); |
| 4999 | |
| 5000 | return err; |
| 5001 | } |
| 5002 | |
| 5003 | static ssize_t slab_attr_store(struct kobject *kobj, |
| 5004 | struct attribute *attr, |
| 5005 | const char *buf, size_t len) |
| 5006 | { |
| 5007 | struct slab_attribute *attribute; |
| 5008 | struct kmem_cache *s; |
| 5009 | int err; |
| 5010 | |
| 5011 | attribute = to_slab_attr(attr); |
| 5012 | s = to_slab(kobj); |
| 5013 | |
| 5014 | if (!attribute->store) |
| 5015 | return -EIO; |
| 5016 | |
| 5017 | err = attribute->store(s, buf, len); |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5018 | #ifdef CONFIG_MEMCG_KMEM |
| 5019 | if (slab_state >= FULL && err >= 0 && is_root_cache(s)) { |
| 5020 | int i; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5021 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5022 | mutex_lock(&slab_mutex); |
| 5023 | if (s->max_attr_size < len) |
| 5024 | s->max_attr_size = len; |
| 5025 | |
Glauber Costa | ebe945c | 2012-12-18 14:23:10 -0800 | [diff] [blame] | 5026 | /* |
| 5027 | * This is a best effort propagation, so this function's return |
| 5028 | * value will be determined by the parent cache only. This is |
| 5029 | * basically because not all attributes will have a well |
| 5030 | * defined semantics for rollbacks - most of the actions will |
| 5031 | * have permanent effects. |
| 5032 | * |
| 5033 | * Returning the error value of any of the children that fail |
| 5034 | * is not 100 % defined, in the sense that users seeing the |
| 5035 | * error code won't be able to know anything about the state of |
| 5036 | * the cache. |
| 5037 | * |
| 5038 | * Only returning the error code for the parent cache at least |
| 5039 | * has well defined semantics. The cache being written to |
| 5040 | * directly either failed or succeeded, in which case we loop |
| 5041 | * through the descendants with best-effort propagation. |
| 5042 | */ |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5043 | for_each_memcg_cache_index(i) { |
| 5044 | struct kmem_cache *c = cache_from_memcg(s, i); |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5045 | if (c) |
| 5046 | attribute->store(c, buf, len); |
| 5047 | } |
| 5048 | mutex_unlock(&slab_mutex); |
| 5049 | } |
| 5050 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5051 | return err; |
| 5052 | } |
| 5053 | |
Glauber Costa | 107dab5 | 2012-12-18 14:23:05 -0800 | [diff] [blame] | 5054 | static void memcg_propagate_slab_attrs(struct kmem_cache *s) |
| 5055 | { |
| 5056 | #ifdef CONFIG_MEMCG_KMEM |
| 5057 | int i; |
| 5058 | char *buffer = NULL; |
| 5059 | |
| 5060 | if (!is_root_cache(s)) |
| 5061 | return; |
| 5062 | |
| 5063 | /* |
| 5064 | * This mean this cache had no attribute written. Therefore, no point |
| 5065 | * in copying default values around |
| 5066 | */ |
| 5067 | if (!s->max_attr_size) |
| 5068 | return; |
| 5069 | |
| 5070 | for (i = 0; i < ARRAY_SIZE(slab_attrs); i++) { |
| 5071 | char mbuf[64]; |
| 5072 | char *buf; |
| 5073 | struct slab_attribute *attr = to_slab_attr(slab_attrs[i]); |
| 5074 | |
| 5075 | if (!attr || !attr->store || !attr->show) |
| 5076 | continue; |
| 5077 | |
| 5078 | /* |
| 5079 | * It is really bad that we have to allocate here, so we will |
| 5080 | * do it only as a fallback. If we actually allocate, though, |
| 5081 | * we can just use the allocated buffer until the end. |
| 5082 | * |
| 5083 | * Most of the slub attributes will tend to be very small in |
| 5084 | * size, but sysfs allows buffers up to a page, so they can |
| 5085 | * theoretically happen. |
| 5086 | */ |
| 5087 | if (buffer) |
| 5088 | buf = buffer; |
| 5089 | else if (s->max_attr_size < ARRAY_SIZE(mbuf)) |
| 5090 | buf = mbuf; |
| 5091 | else { |
| 5092 | buffer = (char *) get_zeroed_page(GFP_KERNEL); |
| 5093 | if (WARN_ON(!buffer)) |
| 5094 | continue; |
| 5095 | buf = buffer; |
| 5096 | } |
| 5097 | |
| 5098 | attr->show(s->memcg_params->root_cache, buf); |
| 5099 | attr->store(s, buf, strlen(buf)); |
| 5100 | } |
| 5101 | |
| 5102 | if (buffer) |
| 5103 | free_page((unsigned long)buffer); |
| 5104 | #endif |
| 5105 | } |
| 5106 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 5107 | static const struct sysfs_ops slab_sysfs_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5108 | .show = slab_attr_show, |
| 5109 | .store = slab_attr_store, |
| 5110 | }; |
| 5111 | |
| 5112 | static struct kobj_type slab_ktype = { |
| 5113 | .sysfs_ops = &slab_sysfs_ops, |
| 5114 | }; |
| 5115 | |
| 5116 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| 5117 | { |
| 5118 | struct kobj_type *ktype = get_ktype(kobj); |
| 5119 | |
| 5120 | if (ktype == &slab_ktype) |
| 5121 | return 1; |
| 5122 | return 0; |
| 5123 | } |
| 5124 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 5125 | static const struct kset_uevent_ops slab_uevent_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5126 | .filter = uevent_filter, |
| 5127 | }; |
| 5128 | |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5129 | static struct kset *slab_kset; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5130 | |
| 5131 | #define ID_STR_LENGTH 64 |
| 5132 | |
| 5133 | /* Create a unique string id for a slab cache: |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 5134 | * |
| 5135 | * Format :[flags-]size |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5136 | */ |
| 5137 | static char *create_unique_id(struct kmem_cache *s) |
| 5138 | { |
| 5139 | char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL); |
| 5140 | char *p = name; |
| 5141 | |
| 5142 | BUG_ON(!name); |
| 5143 | |
| 5144 | *p++ = ':'; |
| 5145 | /* |
| 5146 | * First flags affecting slabcache operations. We will only |
| 5147 | * get here for aliasable slabs so we do not need to support |
| 5148 | * too many flags. The flags here must cover all flags that |
| 5149 | * are matched during merging to guarantee that the id is |
| 5150 | * unique. |
| 5151 | */ |
| 5152 | if (s->flags & SLAB_CACHE_DMA) |
| 5153 | *p++ = 'd'; |
| 5154 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 5155 | *p++ = 'a'; |
| 5156 | if (s->flags & SLAB_DEBUG_FREE) |
| 5157 | *p++ = 'F'; |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 5158 | if (!(s->flags & SLAB_NOTRACK)) |
| 5159 | *p++ = 't'; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5160 | if (p != name + 1) |
| 5161 | *p++ = '-'; |
| 5162 | p += sprintf(p, "%07d", s->size); |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 5163 | |
| 5164 | #ifdef CONFIG_MEMCG_KMEM |
| 5165 | if (!is_root_cache(s)) |
| 5166 | p += sprintf(p, "-%08d", memcg_cache_id(s->memcg_params->memcg)); |
| 5167 | #endif |
| 5168 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5169 | BUG_ON(p > name + ID_STR_LENGTH - 1); |
| 5170 | return name; |
| 5171 | } |
| 5172 | |
| 5173 | static int sysfs_slab_add(struct kmem_cache *s) |
| 5174 | { |
| 5175 | int err; |
| 5176 | const char *name; |
Christoph Lameter | 45530c4 | 2012-11-28 16:23:07 +0000 | [diff] [blame] | 5177 | int unmergeable = slab_unmergeable(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5178 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5179 | if (unmergeable) { |
| 5180 | /* |
| 5181 | * Slabcache can never be merged so we can use the name proper. |
| 5182 | * This is typically the case for debug situations. In that |
| 5183 | * case we can catch duplicate names easily. |
| 5184 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5185 | sysfs_remove_link(&slab_kset->kobj, s->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5186 | name = s->name; |
| 5187 | } else { |
| 5188 | /* |
| 5189 | * Create a unique name for the slab as a target |
| 5190 | * for the symlinks. |
| 5191 | */ |
| 5192 | name = create_unique_id(s); |
| 5193 | } |
| 5194 | |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5195 | s->kobj.kset = slab_kset; |
Greg Kroah-Hartman | 1eada11 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 5196 | err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, name); |
| 5197 | if (err) { |
| 5198 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5199 | return err; |
Greg Kroah-Hartman | 1eada11 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 5200 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5201 | |
| 5202 | err = sysfs_create_group(&s->kobj, &slab_attr_group); |
Xiaotian Feng | 5788d8a | 2009-07-22 11:28:53 +0800 | [diff] [blame] | 5203 | if (err) { |
| 5204 | kobject_del(&s->kobj); |
| 5205 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5206 | return err; |
Xiaotian Feng | 5788d8a | 2009-07-22 11:28:53 +0800 | [diff] [blame] | 5207 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5208 | kobject_uevent(&s->kobj, KOBJ_ADD); |
| 5209 | if (!unmergeable) { |
| 5210 | /* Setup first alias */ |
| 5211 | sysfs_slab_alias(s, s->name); |
| 5212 | kfree(name); |
| 5213 | } |
| 5214 | return 0; |
| 5215 | } |
| 5216 | |
| 5217 | static void sysfs_slab_remove(struct kmem_cache *s) |
| 5218 | { |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 5219 | if (slab_state < FULL) |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5220 | /* |
| 5221 | * Sysfs has not been setup yet so no need to remove the |
| 5222 | * cache from sysfs. |
| 5223 | */ |
| 5224 | return; |
| 5225 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5226 | kobject_uevent(&s->kobj, KOBJ_REMOVE); |
| 5227 | kobject_del(&s->kobj); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 5228 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5229 | } |
| 5230 | |
| 5231 | /* |
| 5232 | * Need to buffer aliases during bootup until sysfs becomes |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 5233 | * available lest we lose that information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5234 | */ |
| 5235 | struct saved_alias { |
| 5236 | struct kmem_cache *s; |
| 5237 | const char *name; |
| 5238 | struct saved_alias *next; |
| 5239 | }; |
| 5240 | |
Adrian Bunk | 5af328a | 2007-07-17 04:03:27 -0700 | [diff] [blame] | 5241 | static struct saved_alias *alias_list; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5242 | |
| 5243 | static int sysfs_slab_alias(struct kmem_cache *s, const char *name) |
| 5244 | { |
| 5245 | struct saved_alias *al; |
| 5246 | |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 5247 | if (slab_state == FULL) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5248 | /* |
| 5249 | * If we have a leftover link then remove it. |
| 5250 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5251 | sysfs_remove_link(&slab_kset->kobj, name); |
| 5252 | return sysfs_create_link(&slab_kset->kobj, &s->kobj, name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5253 | } |
| 5254 | |
| 5255 | al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); |
| 5256 | if (!al) |
| 5257 | return -ENOMEM; |
| 5258 | |
| 5259 | al->s = s; |
| 5260 | al->name = name; |
| 5261 | al->next = alias_list; |
| 5262 | alias_list = al; |
| 5263 | return 0; |
| 5264 | } |
| 5265 | |
| 5266 | static int __init slab_sysfs_init(void) |
| 5267 | { |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 5268 | struct kmem_cache *s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5269 | int err; |
| 5270 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 5271 | mutex_lock(&slab_mutex); |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5272 | |
Greg Kroah-Hartman | 0ff21e4 | 2007-11-06 10:36:58 -0800 | [diff] [blame] | 5273 | 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] | 5274 | if (!slab_kset) { |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 5275 | mutex_unlock(&slab_mutex); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5276 | printk(KERN_ERR "Cannot register slab subsystem.\n"); |
| 5277 | return -ENOSYS; |
| 5278 | } |
| 5279 | |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 5280 | slab_state = FULL; |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5281 | |
Christoph Lameter | 5b95a4ac | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 5282 | list_for_each_entry(s, &slab_caches, list) { |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5283 | err = sysfs_slab_add(s); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5284 | if (err) |
| 5285 | printk(KERN_ERR "SLUB: Unable to add boot slab %s" |
| 5286 | " to sysfs\n", s->name); |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5287 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5288 | |
| 5289 | while (alias_list) { |
| 5290 | struct saved_alias *al = alias_list; |
| 5291 | |
| 5292 | alias_list = alias_list->next; |
| 5293 | err = sysfs_slab_alias(al->s, al->name); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5294 | if (err) |
| 5295 | printk(KERN_ERR "SLUB: Unable to add boot slab alias" |
Julia Lawall | 068ce41 | 2012-07-08 13:37:40 +0200 | [diff] [blame] | 5296 | " %s to sysfs\n", al->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5297 | kfree(al); |
| 5298 | } |
| 5299 | |
Christoph Lameter | 18004c5 | 2012-07-06 15:25:12 -0500 | [diff] [blame] | 5300 | mutex_unlock(&slab_mutex); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5301 | resiliency_test(); |
| 5302 | return 0; |
| 5303 | } |
| 5304 | |
| 5305 | __initcall(slab_sysfs_init); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 5306 | #endif /* CONFIG_SYSFS */ |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5307 | |
| 5308 | /* |
| 5309 | * The /proc/slabinfo ABI |
| 5310 | */ |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5311 | #ifdef CONFIG_SLABINFO |
Glauber Costa | 0d7561c | 2012-10-19 18:20:27 +0400 | [diff] [blame] | 5312 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo) |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5313 | { |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5314 | unsigned long nr_slabs = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5315 | unsigned long nr_objs = 0; |
| 5316 | unsigned long nr_free = 0; |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5317 | int node; |
| 5318 | |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5319 | for_each_online_node(node) { |
| 5320 | struct kmem_cache_node *n = get_node(s, node); |
| 5321 | |
| 5322 | if (!n) |
| 5323 | continue; |
| 5324 | |
Wanpeng Li | c17fd13 | 2013-07-04 08:33:26 +0800 | [diff] [blame] | 5325 | nr_slabs += node_nr_slabs(n); |
| 5326 | nr_objs += node_nr_objs(n); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5327 | nr_free += count_partial(n, count_free); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5328 | } |
| 5329 | |
Glauber Costa | 0d7561c | 2012-10-19 18:20:27 +0400 | [diff] [blame] | 5330 | sinfo->active_objs = nr_objs - nr_free; |
| 5331 | sinfo->num_objs = nr_objs; |
| 5332 | sinfo->active_slabs = nr_slabs; |
| 5333 | sinfo->num_slabs = nr_slabs; |
| 5334 | sinfo->objects_per_slab = oo_objects(s->oo); |
| 5335 | sinfo->cache_order = oo_order(s->oo); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5336 | } |
| 5337 | |
Glauber Costa | 0d7561c | 2012-10-19 18:20:27 +0400 | [diff] [blame] | 5338 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s) |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5339 | { |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5340 | } |
| 5341 | |
Glauber Costa | b7454ad | 2012-10-19 18:20:25 +0400 | [diff] [blame] | 5342 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
| 5343 | size_t count, loff_t *ppos) |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5344 | { |
Glauber Costa | b7454ad | 2012-10-19 18:20:25 +0400 | [diff] [blame] | 5345 | return -EIO; |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5346 | } |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5347 | #endif /* CONFIG_SLABINFO */ |