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 | * |
| 5 | * The allocator synchronizes using per slab locks and only |
| 6 | * uses a centralized lock to manage a pool of partial slabs. |
| 7 | * |
Christoph Lameter | cde5353 | 2008-07-04 09:59:22 -0700 | [diff] [blame] | 8 | * (C) 2007 SGI, Christoph Lameter |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #include <linux/mm.h> |
Nick Piggin | 1eb5ac6 | 2009-05-05 19:13:44 +1000 | [diff] [blame] | 12 | #include <linux/swap.h> /* struct reclaim_state */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/bit_spinlock.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/bitops.h> |
| 17 | #include <linux/slab.h> |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 18 | #include <linux/proc_fs.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 19 | #include <linux/seq_file.h> |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 20 | #include <linux/kmemcheck.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 21 | #include <linux/cpu.h> |
| 22 | #include <linux/cpuset.h> |
| 23 | #include <linux/mempolicy.h> |
| 24 | #include <linux/ctype.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 25 | #include <linux/debugobjects.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 26 | #include <linux/kallsyms.h> |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 27 | #include <linux/memory.h> |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 28 | #include <linux/math64.h> |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 29 | #include <linux/fault-inject.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 30 | |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 31 | #include <trace/events/kmem.h> |
| 32 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 33 | /* |
| 34 | * Lock order: |
| 35 | * 1. slab_lock(page) |
| 36 | * 2. slab->list_lock |
| 37 | * |
| 38 | * The slab_lock protects operations on the object of a particular |
| 39 | * slab and its metadata in the page struct. If the slab lock |
| 40 | * has been taken then no allocations nor frees can be performed |
| 41 | * on the objects in the slab nor can the slab be added or removed |
| 42 | * from the partial or full lists since this would mean modifying |
| 43 | * the page_struct of the slab. |
| 44 | * |
| 45 | * The list_lock protects the partial and full list on each node and |
| 46 | * the partial slab counter. If taken then no new slabs may be added or |
| 47 | * removed from the lists nor make the number of partial slabs be modified. |
| 48 | * (Note that the total number of slabs is an atomic value that may be |
| 49 | * modified without taking the list lock). |
| 50 | * |
| 51 | * The list_lock is a centralized lock and thus we avoid taking it as |
| 52 | * much as possible. As long as SLUB does not have to handle partial |
| 53 | * slabs, operations can continue without any centralized lock. F.e. |
| 54 | * allocating a long series of objects that fill up slabs does not require |
| 55 | * the list lock. |
| 56 | * |
| 57 | * The lock order is sometimes inverted when we are trying to get a slab |
| 58 | * off a list. We take the list_lock and then look for a page on the list |
| 59 | * to use. While we do that objects in the slabs may be freed. We can |
| 60 | * only operate on the slab if we have also taken the slab_lock. So we use |
| 61 | * a slab_trylock() on the slab. If trylock was successful then no frees |
| 62 | * can occur anymore and we can use the slab for allocations etc. If the |
| 63 | * slab_trylock() does not succeed then frees are in progress in the slab and |
| 64 | * we must stay away from it for a while since we may cause a bouncing |
| 65 | * cacheline if we try to acquire the lock. So go onto the next slab. |
| 66 | * If all pages are busy then we may allocate a new slab instead of reusing |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 67 | * a partial slab. A new slab has no one operating on it and thus there is |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 68 | * no danger of cacheline contention. |
| 69 | * |
| 70 | * Interrupts are disabled during allocation and deallocation in order to |
| 71 | * make the slab allocator safe to use in the context of an irq. In addition |
| 72 | * interrupts are disabled to ensure that the processor does not change |
| 73 | * while handling per_cpu slabs, due to kernel preemption. |
| 74 | * |
| 75 | * SLUB assigns one slab for allocation to each processor. |
| 76 | * Allocations only occur from these slabs called cpu slabs. |
| 77 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 78 | * Slabs with free elements are kept on a partial list and during regular |
| 79 | * 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] | 80 | * freed then the slab will show up again on the partial lists. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 81 | * We track full slabs for debugging purposes though because otherwise we |
| 82 | * cannot scan all objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 83 | * |
| 84 | * Slabs are freed when they become empty. Teardown and setup is |
| 85 | * minimal so we rely on the page allocators per cpu caches for |
| 86 | * fast frees and allocs. |
| 87 | * |
| 88 | * Overloading of page flags that are otherwise used for LRU management. |
| 89 | * |
Christoph Lameter | 4b6f075 | 2007-05-16 22:10:53 -0700 | [diff] [blame] | 90 | * PageActive The slab is frozen and exempt from list processing. |
| 91 | * This means that the slab is dedicated to a purpose |
| 92 | * such as satisfying allocations for a specific |
| 93 | * processor. Objects may be freed in the slab while |
| 94 | * it is frozen but slab_free will then skip the usual |
| 95 | * list operations. It is up to the processor holding |
| 96 | * the slab to integrate the slab into the slab lists |
| 97 | * when the slab is no longer needed. |
| 98 | * |
| 99 | * One use of this flag is to mark slabs that are |
| 100 | * used for allocations. Then such a slab becomes a cpu |
| 101 | * slab. The cpu slab may be equipped with an additional |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 102 | * freelist that allows lockless access to |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 103 | * free objects in addition to the regular freelist |
| 104 | * that requires the slab lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 105 | * |
| 106 | * PageError Slab requires special handling due to debug |
| 107 | * options set. This moves slab handling out of |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 108 | * the fast path and disables lockless freelists. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 109 | */ |
| 110 | |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 111 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
| 112 | SLAB_TRACE | SLAB_DEBUG_FREE) |
| 113 | |
| 114 | static inline int kmem_cache_debug(struct kmem_cache *s) |
| 115 | { |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 116 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 117 | return unlikely(s->flags & SLAB_DEBUG_FLAGS); |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 118 | #else |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 119 | return 0; |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 120 | #endif |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 121 | } |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 122 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 123 | /* |
| 124 | * Issues still to be resolved: |
| 125 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 126 | * - Support PAGE_ALLOC_DEBUG. Should be easy to do. |
| 127 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 128 | * - Variable sizing of the per node arrays |
| 129 | */ |
| 130 | |
| 131 | /* Enable to test recovery from slab corruption on boot */ |
| 132 | #undef SLUB_RESILIENCY_TEST |
| 133 | |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 134 | /* Enable to log cmpxchg failures */ |
| 135 | #undef SLUB_DEBUG_CMPXCHG |
| 136 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 137 | /* |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 138 | * Mininum number of partial slabs. These will be left on the partial |
| 139 | * lists even if they are empty. kmem_cache_shrink may reclaim them. |
| 140 | */ |
Christoph Lameter | 76be895 | 2007-12-21 14:37:37 -0800 | [diff] [blame] | 141 | #define MIN_PARTIAL 5 |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 142 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 143 | /* |
| 144 | * Maximum number of desirable partial slabs. |
| 145 | * The existence of more partial slabs makes kmem_cache_shrink |
| 146 | * sort the partial list by the number of objects in the. |
| 147 | */ |
| 148 | #define MAX_PARTIAL 10 |
| 149 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 150 | #define DEBUG_DEFAULT_FLAGS (SLAB_DEBUG_FREE | SLAB_RED_ZONE | \ |
| 151 | SLAB_POISON | SLAB_STORE_USER) |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 152 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 153 | /* |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 154 | * Debugging flags that require metadata to be stored in the slab. These get |
| 155 | * disabled when slub_debug=O is used and a cache's min order increases with |
| 156 | * metadata. |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 157 | */ |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 158 | #define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 159 | |
| 160 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 161 | * Set of flags that will prevent slab merging |
| 162 | */ |
| 163 | #define SLUB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 164 | SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE | \ |
| 165 | SLAB_FAILSLAB) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 166 | |
| 167 | #define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \ |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 168 | SLAB_CACHE_DMA | SLAB_NOTRACK) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 169 | |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 170 | #define OO_SHIFT 16 |
| 171 | #define OO_MASK ((1 << OO_SHIFT) - 1) |
Christoph Lameter | 50d5c41 | 2011-06-01 12:25:45 -0500 | [diff] [blame] | 172 | #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */ |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 173 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 174 | /* Internal SLUB flags */ |
Christoph Lameter | f90ec39 | 2010-07-09 14:07:11 -0500 | [diff] [blame] | 175 | #define __OBJECT_POISON 0x80000000UL /* Poison object */ |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 176 | #define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 177 | |
| 178 | static int kmem_size = sizeof(struct kmem_cache); |
| 179 | |
| 180 | #ifdef CONFIG_SMP |
| 181 | static struct notifier_block slab_notifier; |
| 182 | #endif |
| 183 | |
| 184 | static enum { |
| 185 | DOWN, /* No slab functionality available */ |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 186 | PARTIAL, /* Kmem_cache_node works */ |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 187 | UP, /* Everything works but does not show up in sysfs */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 188 | SYSFS /* Sysfs up */ |
| 189 | } slab_state = DOWN; |
| 190 | |
| 191 | /* A list of all slab caches on the system */ |
| 192 | static DECLARE_RWSEM(slub_lock); |
Adrian Bunk | 5af328a | 2007-07-17 04:03:27 -0700 | [diff] [blame] | 193 | static LIST_HEAD(slab_caches); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 194 | |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 195 | /* |
| 196 | * Tracking user of a slab. |
| 197 | */ |
| 198 | struct track { |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 199 | unsigned long addr; /* Called from address */ |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 200 | int cpu; /* Was running on cpu */ |
| 201 | int pid; /* Pid context */ |
| 202 | unsigned long when; /* When did the operation occur */ |
| 203 | }; |
| 204 | |
| 205 | enum track_item { TRACK_ALLOC, TRACK_FREE }; |
| 206 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 207 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 208 | static int sysfs_slab_add(struct kmem_cache *); |
| 209 | static int sysfs_slab_alias(struct kmem_cache *, const char *); |
| 210 | static void sysfs_slab_remove(struct kmem_cache *); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 211 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 212 | #else |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 213 | static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } |
| 214 | static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) |
| 215 | { return 0; } |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 216 | static inline void sysfs_slab_remove(struct kmem_cache *s) |
| 217 | { |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 218 | kfree(s->name); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 219 | kfree(s); |
| 220 | } |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 221 | |
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 | 84e554e | 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 | |
| 235 | int slab_is_available(void) |
| 236 | { |
| 237 | return slab_state >= UP; |
| 238 | } |
| 239 | |
| 240 | static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) |
| 241 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 242 | return s->node[node]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 245 | /* 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] | 246 | static inline int check_valid_pointer(struct kmem_cache *s, |
| 247 | struct page *page, const void *object) |
| 248 | { |
| 249 | void *base; |
| 250 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 251 | if (!object) |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 252 | return 1; |
| 253 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 254 | base = page_address(page); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 255 | if (object < base || object >= base + page->objects * s->size || |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 256 | (object - base) % s->size) { |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | return 1; |
| 261 | } |
| 262 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 263 | static inline void *get_freepointer(struct kmem_cache *s, void *object) |
| 264 | { |
| 265 | return *(void **)(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)) |
| 304 | return s->objsize; |
| 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 | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 345 | static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
| 346 | void *freelist_old, unsigned long counters_old, |
| 347 | void *freelist_new, unsigned long counters_new, |
| 348 | const char *n) |
| 349 | { |
| 350 | #ifdef CONFIG_CMPXCHG_DOUBLE |
| 351 | if (s->flags & __CMPXCHG_DOUBLE) { |
| 352 | if (cmpxchg_double(&page->freelist, |
| 353 | freelist_old, counters_old, |
| 354 | freelist_new, counters_new)) |
| 355 | return 1; |
| 356 | } else |
| 357 | #endif |
| 358 | { |
| 359 | if (page->freelist == freelist_old && page->counters == counters_old) { |
| 360 | page->freelist = freelist_new; |
| 361 | page->counters = counters_new; |
| 362 | return 1; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | cpu_relax(); |
| 367 | stat(s, CMPXCHG_DOUBLE_FAIL); |
| 368 | |
| 369 | #ifdef SLUB_DEBUG_CMPXCHG |
| 370 | printk(KERN_INFO "%s %s: cmpxchg double redo ", n, s->name); |
| 371 | #endif |
| 372 | |
| 373 | return 0; |
| 374 | } |
| 375 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 376 | #ifdef CONFIG_SLUB_DEBUG |
| 377 | /* |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 378 | * Determine a map of object in use on a page. |
| 379 | * |
| 380 | * Slab lock or node listlock must be held to guarantee that the page does |
| 381 | * not vanish from under us. |
| 382 | */ |
| 383 | static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map) |
| 384 | { |
| 385 | void *p; |
| 386 | void *addr = page_address(page); |
| 387 | |
| 388 | for (p = page->freelist; p; p = get_freepointer(s, p)) |
| 389 | set_bit(slab_index(p, s, addr), map); |
| 390 | } |
| 391 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 392 | /* |
| 393 | * Debug settings: |
| 394 | */ |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 395 | #ifdef CONFIG_SLUB_DEBUG_ON |
| 396 | static int slub_debug = DEBUG_DEFAULT_FLAGS; |
| 397 | #else |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 398 | static int slub_debug; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 399 | #endif |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 400 | |
| 401 | static char *slub_debug_slabs; |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 402 | static int disable_higher_order_debug; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 403 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 404 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 405 | * Object debugging |
| 406 | */ |
| 407 | static void print_section(char *text, u8 *addr, unsigned int length) |
| 408 | { |
| 409 | int i, offset; |
| 410 | int newline = 1; |
| 411 | char ascii[17]; |
| 412 | |
| 413 | ascii[16] = 0; |
| 414 | |
| 415 | for (i = 0; i < length; i++) { |
| 416 | if (newline) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 417 | printk(KERN_ERR "%8s 0x%p: ", text, addr + i); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 418 | newline = 0; |
| 419 | } |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 420 | printk(KERN_CONT " %02x", addr[i]); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 421 | offset = i % 16; |
| 422 | ascii[offset] = isgraph(addr[i]) ? addr[i] : '.'; |
| 423 | if (offset == 15) { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 424 | printk(KERN_CONT " %s\n", ascii); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 425 | newline = 1; |
| 426 | } |
| 427 | } |
| 428 | if (!newline) { |
| 429 | i %= 16; |
| 430 | while (i < 16) { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 431 | printk(KERN_CONT " "); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 432 | ascii[i] = ' '; |
| 433 | i++; |
| 434 | } |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 435 | printk(KERN_CONT " %s\n", ascii); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 436 | } |
| 437 | } |
| 438 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 439 | static struct track *get_track(struct kmem_cache *s, void *object, |
| 440 | enum track_item alloc) |
| 441 | { |
| 442 | struct track *p; |
| 443 | |
| 444 | if (s->offset) |
| 445 | p = object + s->offset + sizeof(void *); |
| 446 | else |
| 447 | p = object + s->inuse; |
| 448 | |
| 449 | return p + alloc; |
| 450 | } |
| 451 | |
| 452 | static void set_track(struct kmem_cache *s, void *object, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 453 | enum track_item alloc, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 454 | { |
Akinobu Mita | 1a00df4 | 2009-03-07 00:36:21 +0900 | [diff] [blame] | 455 | struct track *p = get_track(s, object, alloc); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 456 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 457 | if (addr) { |
| 458 | p->addr = addr; |
| 459 | p->cpu = smp_processor_id(); |
Alexey Dobriyan | 88e4ccf | 2008-06-23 02:58:37 +0400 | [diff] [blame] | 460 | p->pid = current->pid; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 461 | p->when = jiffies; |
| 462 | } else |
| 463 | memset(p, 0, sizeof(struct track)); |
| 464 | } |
| 465 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 466 | static void init_tracking(struct kmem_cache *s, void *object) |
| 467 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 468 | if (!(s->flags & SLAB_STORE_USER)) |
| 469 | return; |
| 470 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 471 | set_track(s, object, TRACK_FREE, 0UL); |
| 472 | set_track(s, object, TRACK_ALLOC, 0UL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | static void print_track(const char *s, struct track *t) |
| 476 | { |
| 477 | if (!t->addr) |
| 478 | return; |
| 479 | |
Linus Torvalds | 7daf705 | 2008-07-14 12:12:53 -0700 | [diff] [blame] | 480 | 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] | 481 | s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 482 | } |
| 483 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 484 | static void print_tracking(struct kmem_cache *s, void *object) |
| 485 | { |
| 486 | if (!(s->flags & SLAB_STORE_USER)) |
| 487 | return; |
| 488 | |
| 489 | print_track("Allocated", get_track(s, object, TRACK_ALLOC)); |
| 490 | print_track("Freed", get_track(s, object, TRACK_FREE)); |
| 491 | } |
| 492 | |
| 493 | static void print_page_info(struct page *page) |
| 494 | { |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 495 | printk(KERN_ERR "INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n", |
| 496 | page, page->objects, page->inuse, page->freelist, page->flags); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 497 | |
| 498 | } |
| 499 | |
| 500 | static void slab_bug(struct kmem_cache *s, char *fmt, ...) |
| 501 | { |
| 502 | va_list args; |
| 503 | char buf[100]; |
| 504 | |
| 505 | va_start(args, fmt); |
| 506 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 507 | va_end(args); |
| 508 | printk(KERN_ERR "========================================" |
| 509 | "=====================================\n"); |
| 510 | printk(KERN_ERR "BUG %s: %s\n", s->name, buf); |
| 511 | printk(KERN_ERR "----------------------------------------" |
| 512 | "-------------------------------------\n\n"); |
| 513 | } |
| 514 | |
| 515 | static void slab_fix(struct kmem_cache *s, char *fmt, ...) |
| 516 | { |
| 517 | va_list args; |
| 518 | char buf[100]; |
| 519 | |
| 520 | va_start(args, fmt); |
| 521 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 522 | va_end(args); |
| 523 | printk(KERN_ERR "FIX %s: %s\n", s->name, buf); |
| 524 | } |
| 525 | |
| 526 | 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] | 527 | { |
| 528 | unsigned int off; /* Offset of last byte */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 529 | u8 *addr = page_address(page); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 530 | |
| 531 | print_tracking(s, p); |
| 532 | |
| 533 | print_page_info(page); |
| 534 | |
| 535 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu fp=0x%p\n\n", |
| 536 | p, p - addr, get_freepointer(s, p)); |
| 537 | |
| 538 | if (p > addr + 16) |
| 539 | print_section("Bytes b4", p - 16, 16); |
| 540 | |
Pekka Enberg | 0ebd652 | 2008-07-19 14:17:22 +0300 | [diff] [blame] | 541 | print_section("Object", p, min_t(unsigned long, s->objsize, PAGE_SIZE)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 542 | |
| 543 | if (s->flags & SLAB_RED_ZONE) |
| 544 | print_section("Redzone", p + s->objsize, |
| 545 | s->inuse - s->objsize); |
| 546 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 547 | if (s->offset) |
| 548 | off = s->offset + sizeof(void *); |
| 549 | else |
| 550 | off = s->inuse; |
| 551 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 552 | if (s->flags & SLAB_STORE_USER) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 553 | off += 2 * sizeof(struct track); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 554 | |
| 555 | if (off != s->size) |
| 556 | /* Beginning of the filler is the free pointer */ |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 557 | print_section("Padding", p + off, s->size - off); |
| 558 | |
| 559 | dump_stack(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | static void object_err(struct kmem_cache *s, struct page *page, |
| 563 | u8 *object, char *reason) |
| 564 | { |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 565 | slab_bug(s, "%s", reason); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 566 | print_trailer(s, page, object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 567 | } |
| 568 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 569 | static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 570 | { |
| 571 | va_list args; |
| 572 | char buf[100]; |
| 573 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 574 | va_start(args, fmt); |
| 575 | vsnprintf(buf, sizeof(buf), fmt, args); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 576 | va_end(args); |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 577 | slab_bug(s, "%s", buf); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 578 | print_page_info(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 579 | dump_stack(); |
| 580 | } |
| 581 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 582 | static void init_object(struct kmem_cache *s, void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 583 | { |
| 584 | u8 *p = object; |
| 585 | |
| 586 | if (s->flags & __OBJECT_POISON) { |
| 587 | memset(p, POISON_FREE, s->objsize - 1); |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 588 | p[s->objsize - 1] = POISON_END; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | if (s->flags & SLAB_RED_ZONE) |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 592 | memset(p + s->objsize, val, s->inuse - s->objsize); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 593 | } |
| 594 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 595 | static u8 *check_bytes(u8 *start, unsigned int value, unsigned int bytes) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 596 | { |
| 597 | while (bytes) { |
| 598 | if (*start != (u8)value) |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 599 | return start; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 600 | start++; |
| 601 | bytes--; |
| 602 | } |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 603 | return NULL; |
| 604 | } |
| 605 | |
| 606 | static void restore_bytes(struct kmem_cache *s, char *message, u8 data, |
| 607 | void *from, void *to) |
| 608 | { |
| 609 | slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data); |
| 610 | memset(from, data, to - from); |
| 611 | } |
| 612 | |
| 613 | static int check_bytes_and_report(struct kmem_cache *s, struct page *page, |
| 614 | u8 *object, char *what, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 615 | u8 *start, unsigned int value, unsigned int bytes) |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 616 | { |
| 617 | u8 *fault; |
| 618 | u8 *end; |
| 619 | |
| 620 | fault = check_bytes(start, value, bytes); |
| 621 | if (!fault) |
| 622 | return 1; |
| 623 | |
| 624 | end = start + bytes; |
| 625 | while (end > fault && end[-1] == value) |
| 626 | end--; |
| 627 | |
| 628 | slab_bug(s, "%s overwritten", what); |
| 629 | printk(KERN_ERR "INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n", |
| 630 | fault, end - 1, fault[0], value); |
| 631 | print_trailer(s, page, object); |
| 632 | |
| 633 | restore_bytes(s, what, value, fault, end); |
| 634 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 635 | } |
| 636 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 637 | /* |
| 638 | * Object layout: |
| 639 | * |
| 640 | * object address |
| 641 | * Bytes of the object to be managed. |
| 642 | * If the freepointer may overlay the object then the free |
| 643 | * pointer is the first word of the object. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 644 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 645 | * Poisoning uses 0x6b (POISON_FREE) and the last byte is |
| 646 | * 0xa5 (POISON_END) |
| 647 | * |
| 648 | * object + s->objsize |
| 649 | * Padding to reach word boundary. This is also used for Redzoning. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 650 | * Padding is extended by another word if Redzoning is enabled and |
| 651 | * objsize == inuse. |
| 652 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 653 | * We fill with 0xbb (RED_INACTIVE) for inactive objects and with |
| 654 | * 0xcc (RED_ACTIVE) for objects in use. |
| 655 | * |
| 656 | * object + s->inuse |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 657 | * Meta data starts here. |
| 658 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 659 | * A. Free pointer (if we cannot overwrite object on free) |
| 660 | * B. Tracking data for SLAB_STORE_USER |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 661 | * C. Padding to reach required alignment boundary or at mininum |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 662 | * one word if debugging is on to be able to detect writes |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 663 | * before the word boundary. |
| 664 | * |
| 665 | * Padding is done using 0x5a (POISON_INUSE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 666 | * |
| 667 | * object + s->size |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 668 | * Nothing is used beyond s->size. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 669 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 670 | * If slabcaches are merged then the objsize and inuse boundaries are mostly |
| 671 | * ignored. And therefore no slab options that rely on these boundaries |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 672 | * may be used with merged slabcaches. |
| 673 | */ |
| 674 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 675 | static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) |
| 676 | { |
| 677 | unsigned long off = s->inuse; /* The end of info */ |
| 678 | |
| 679 | if (s->offset) |
| 680 | /* Freepointer is placed after the object. */ |
| 681 | off += sizeof(void *); |
| 682 | |
| 683 | if (s->flags & SLAB_STORE_USER) |
| 684 | /* We also have user information there */ |
| 685 | off += 2 * sizeof(struct track); |
| 686 | |
| 687 | if (s->size == off) |
| 688 | return 1; |
| 689 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 690 | return check_bytes_and_report(s, page, p, "Object padding", |
| 691 | p + off, POISON_INUSE, s->size - off); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 692 | } |
| 693 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 694 | /* Check the pad bytes at the end of a slab page */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 695 | static int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 696 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 697 | u8 *start; |
| 698 | u8 *fault; |
| 699 | u8 *end; |
| 700 | int length; |
| 701 | int remainder; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 702 | |
| 703 | if (!(s->flags & SLAB_POISON)) |
| 704 | return 1; |
| 705 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 706 | start = page_address(page); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 707 | length = (PAGE_SIZE << compound_order(page)) - s->reserved; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 708 | end = start + length; |
| 709 | remainder = length % s->size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 710 | if (!remainder) |
| 711 | return 1; |
| 712 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 713 | fault = check_bytes(end - remainder, POISON_INUSE, remainder); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 714 | if (!fault) |
| 715 | return 1; |
| 716 | while (end > fault && end[-1] == POISON_INUSE) |
| 717 | end--; |
| 718 | |
| 719 | slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 720 | print_section("Padding", end - remainder, remainder); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 721 | |
Eric Dumazet | 8a3d271 | 2009-09-03 16:08:06 +0200 | [diff] [blame] | 722 | restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 723 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 724 | } |
| 725 | |
| 726 | static int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 727 | void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 728 | { |
| 729 | u8 *p = object; |
| 730 | u8 *endobject = object + s->objsize; |
| 731 | |
| 732 | if (s->flags & SLAB_RED_ZONE) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 733 | if (!check_bytes_and_report(s, page, object, "Redzone", |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 734 | endobject, val, s->inuse - s->objsize)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 735 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 736 | } else { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 737 | if ((s->flags & SLAB_POISON) && s->objsize < s->inuse) { |
| 738 | check_bytes_and_report(s, page, p, "Alignment padding", |
| 739 | endobject, POISON_INUSE, s->inuse - s->objsize); |
| 740 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | if (s->flags & SLAB_POISON) { |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 744 | if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) && |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 745 | (!check_bytes_and_report(s, page, p, "Poison", p, |
| 746 | POISON_FREE, s->objsize - 1) || |
| 747 | !check_bytes_and_report(s, page, p, "Poison", |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 748 | p + s->objsize - 1, POISON_END, 1))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 749 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 750 | /* |
| 751 | * check_pad_bytes cleans up on its own. |
| 752 | */ |
| 753 | check_pad_bytes(s, page, p); |
| 754 | } |
| 755 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 756 | if (!s->offset && val == SLUB_RED_ACTIVE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 757 | /* |
| 758 | * Object and freepointer overlap. Cannot check |
| 759 | * freepointer while object is allocated. |
| 760 | */ |
| 761 | return 1; |
| 762 | |
| 763 | /* Check free pointer validity */ |
| 764 | if (!check_valid_pointer(s, page, get_freepointer(s, p))) { |
| 765 | object_err(s, page, p, "Freepointer corrupt"); |
| 766 | /* |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 767 | * No choice but to zap it and thus lose the remainder |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 768 | * of the free objects in this slab. May cause |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 769 | * another error because the object count is now wrong. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 770 | */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 771 | set_freepointer(s, p, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 772 | return 0; |
| 773 | } |
| 774 | return 1; |
| 775 | } |
| 776 | |
| 777 | static int check_slab(struct kmem_cache *s, struct page *page) |
| 778 | { |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 779 | int maxobj; |
| 780 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 781 | VM_BUG_ON(!irqs_disabled()); |
| 782 | |
| 783 | if (!PageSlab(page)) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 784 | slab_err(s, page, "Not a valid slab page"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 785 | return 0; |
| 786 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 787 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 788 | maxobj = order_objects(compound_order(page), s->size, s->reserved); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 789 | if (page->objects > maxobj) { |
| 790 | slab_err(s, page, "objects %u > max %u", |
| 791 | s->name, page->objects, maxobj); |
| 792 | return 0; |
| 793 | } |
| 794 | if (page->inuse > page->objects) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 795 | slab_err(s, page, "inuse %u > max %u", |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 796 | s->name, page->inuse, page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 797 | return 0; |
| 798 | } |
| 799 | /* Slab_pad_check fixes things up after itself */ |
| 800 | slab_pad_check(s, page); |
| 801 | return 1; |
| 802 | } |
| 803 | |
| 804 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 805 | * Determine if a certain object on a page is on the freelist. Must hold the |
| 806 | * slab lock to guarantee that the chains are in a consistent state. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 807 | */ |
| 808 | static int on_freelist(struct kmem_cache *s, struct page *page, void *search) |
| 809 | { |
| 810 | int nr = 0; |
| 811 | void *fp = page->freelist; |
| 812 | void *object = NULL; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 813 | unsigned long max_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 814 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 815 | while (fp && nr <= page->objects) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 816 | if (fp == search) |
| 817 | return 1; |
| 818 | if (!check_valid_pointer(s, page, fp)) { |
| 819 | if (object) { |
| 820 | object_err(s, page, object, |
| 821 | "Freechain corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 822 | set_freepointer(s, object, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 823 | break; |
| 824 | } else { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 825 | slab_err(s, page, "Freepointer corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 826 | page->freelist = NULL; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 827 | page->inuse = page->objects; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 828 | slab_fix(s, "Freelist cleared"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 829 | return 0; |
| 830 | } |
| 831 | break; |
| 832 | } |
| 833 | object = fp; |
| 834 | fp = get_freepointer(s, object); |
| 835 | nr++; |
| 836 | } |
| 837 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 838 | max_objects = order_objects(compound_order(page), s->size, s->reserved); |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 839 | if (max_objects > MAX_OBJS_PER_PAGE) |
| 840 | max_objects = MAX_OBJS_PER_PAGE; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 841 | |
| 842 | if (page->objects != max_objects) { |
| 843 | slab_err(s, page, "Wrong number of objects. Found %d but " |
| 844 | "should be %d", page->objects, max_objects); |
| 845 | page->objects = max_objects; |
| 846 | slab_fix(s, "Number of objects adjusted."); |
| 847 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 848 | if (page->inuse != page->objects - nr) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 849 | slab_err(s, page, "Wrong object count. Counter is %d but " |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 850 | "counted were %d", page->inuse, page->objects - nr); |
| 851 | page->inuse = page->objects - nr; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 852 | slab_fix(s, "Object count adjusted."); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 853 | } |
| 854 | return search == NULL; |
| 855 | } |
| 856 | |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 857 | static void trace(struct kmem_cache *s, struct page *page, void *object, |
| 858 | int alloc) |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 859 | { |
| 860 | if (s->flags & SLAB_TRACE) { |
| 861 | printk(KERN_INFO "TRACE %s %s 0x%p inuse=%d fp=0x%p\n", |
| 862 | s->name, |
| 863 | alloc ? "alloc" : "free", |
| 864 | object, page->inuse, |
| 865 | page->freelist); |
| 866 | |
| 867 | if (!alloc) |
| 868 | print_section("Object", (void *)object, s->objsize); |
| 869 | |
| 870 | dump_stack(); |
| 871 | } |
| 872 | } |
| 873 | |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 874 | /* |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 875 | * Hooks for other subsystems that check memory allocations. In a typical |
| 876 | * production configuration these hooks all should produce no code at all. |
| 877 | */ |
| 878 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) |
| 879 | { |
Christoph Lameter | c1d5083 | 2010-08-20 12:37:17 -0500 | [diff] [blame] | 880 | flags &= gfp_allowed_mask; |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 881 | lockdep_trace_alloc(flags); |
| 882 | might_sleep_if(flags & __GFP_WAIT); |
| 883 | |
| 884 | return should_failslab(s->objsize, flags, s->flags); |
| 885 | } |
| 886 | |
| 887 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, void *object) |
| 888 | { |
Christoph Lameter | c1d5083 | 2010-08-20 12:37:17 -0500 | [diff] [blame] | 889 | flags &= gfp_allowed_mask; |
Eric Dumazet | b3d4188 | 2011-02-14 18:35:22 +0100 | [diff] [blame] | 890 | kmemcheck_slab_alloc(s, flags, object, slab_ksize(s)); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 891 | kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, flags); |
| 892 | } |
| 893 | |
| 894 | static inline void slab_free_hook(struct kmem_cache *s, void *x) |
| 895 | { |
| 896 | kmemleak_free_recursive(x, s->flags); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 897 | |
Christoph Lameter | d3f661d | 2011-02-25 11:38:52 -0600 | [diff] [blame] | 898 | /* |
| 899 | * Trouble is that we may no longer disable interupts in the fast path |
| 900 | * So in order to make the debug calls that expect irqs to be |
| 901 | * disabled we need to disable interrupts temporarily. |
| 902 | */ |
| 903 | #if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP) |
| 904 | { |
| 905 | unsigned long flags; |
| 906 | |
| 907 | local_irq_save(flags); |
| 908 | kmemcheck_slab_free(s, x, s->objsize); |
| 909 | debug_check_no_locks_freed(x, s->objsize); |
Christoph Lameter | d3f661d | 2011-02-25 11:38:52 -0600 | [diff] [blame] | 910 | local_irq_restore(flags); |
| 911 | } |
| 912 | #endif |
Thomas Gleixner | f9b615d | 2011-03-24 21:26:46 +0200 | [diff] [blame] | 913 | if (!(s->flags & SLAB_DEBUG_OBJECTS)) |
| 914 | debug_check_no_obj_freed(x, s->objsize); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 915 | } |
| 916 | |
| 917 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 918 | * Tracking of fully allocated slabs for debugging purposes. |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 919 | * |
| 920 | * list_lock must be held. |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 921 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 922 | static void add_full(struct kmem_cache *s, |
| 923 | struct kmem_cache_node *n, struct page *page) |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 924 | { |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 925 | if (!(s->flags & SLAB_STORE_USER)) |
| 926 | return; |
| 927 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 928 | list_add(&page->lru, &n->full); |
| 929 | } |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 930 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 931 | /* |
| 932 | * list_lock must be held. |
| 933 | */ |
| 934 | static void remove_full(struct kmem_cache *s, struct page *page) |
| 935 | { |
| 936 | if (!(s->flags & SLAB_STORE_USER)) |
| 937 | return; |
| 938 | |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 939 | list_del(&page->lru); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 940 | } |
| 941 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 942 | /* Tracking of the number of slabs for debugging purposes */ |
| 943 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 944 | { |
| 945 | struct kmem_cache_node *n = get_node(s, node); |
| 946 | |
| 947 | return atomic_long_read(&n->nr_slabs); |
| 948 | } |
| 949 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 950 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 951 | { |
| 952 | return atomic_long_read(&n->nr_slabs); |
| 953 | } |
| 954 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 955 | 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] | 956 | { |
| 957 | struct kmem_cache_node *n = get_node(s, node); |
| 958 | |
| 959 | /* |
| 960 | * May be called early in order to allocate a slab for the |
| 961 | * kmem_cache_node structure. Solve the chicken-egg |
| 962 | * dilemma by deferring the increment of the count during |
| 963 | * bootstrap (see early_kmem_cache_node_alloc). |
| 964 | */ |
Christoph Lameter | 7340cc8 | 2010-09-28 08:10:26 -0500 | [diff] [blame] | 965 | if (n) { |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 966 | atomic_long_inc(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 967 | atomic_long_add(objects, &n->total_objects); |
| 968 | } |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 969 | } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 970 | 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] | 971 | { |
| 972 | struct kmem_cache_node *n = get_node(s, node); |
| 973 | |
| 974 | atomic_long_dec(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 975 | atomic_long_sub(objects, &n->total_objects); |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 976 | } |
| 977 | |
| 978 | /* Object debug checks for alloc/free paths */ |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 979 | static void setup_object_debug(struct kmem_cache *s, struct page *page, |
| 980 | void *object) |
| 981 | { |
| 982 | if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON))) |
| 983 | return; |
| 984 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 985 | init_object(s, object, SLUB_RED_INACTIVE); |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 986 | init_tracking(s, object); |
| 987 | } |
| 988 | |
Christoph Lameter | 1537066 | 2010-08-20 12:37:12 -0500 | [diff] [blame] | 989 | 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] | 990 | void *object, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 991 | { |
| 992 | if (!check_slab(s, page)) |
| 993 | goto bad; |
| 994 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 995 | if (!check_valid_pointer(s, page, object)) { |
| 996 | object_err(s, page, object, "Freelist Pointer check fails"); |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 997 | goto bad; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 998 | } |
| 999 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1000 | if (!check_object(s, page, object, SLUB_RED_INACTIVE)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1001 | goto bad; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1002 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1003 | /* Success perform special debug activities for allocs */ |
| 1004 | if (s->flags & SLAB_STORE_USER) |
| 1005 | set_track(s, object, TRACK_ALLOC, addr); |
| 1006 | trace(s, page, object, 1); |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1007 | init_object(s, object, SLUB_RED_ACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1008 | return 1; |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1009 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1010 | bad: |
| 1011 | if (PageSlab(page)) { |
| 1012 | /* |
| 1013 | * If this is a slab page then lets do the best we can |
| 1014 | * to avoid issues in the future. Marking all objects |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1015 | * as used avoids touching the remaining objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1016 | */ |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1017 | slab_fix(s, "Marking all objects used"); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 1018 | page->inuse = page->objects; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1019 | page->freelist = NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1020 | } |
| 1021 | return 0; |
| 1022 | } |
| 1023 | |
Christoph Lameter | 1537066 | 2010-08-20 12:37:12 -0500 | [diff] [blame] | 1024 | static noinline int free_debug_processing(struct kmem_cache *s, |
| 1025 | struct page *page, void *object, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1026 | { |
| 1027 | if (!check_slab(s, page)) |
| 1028 | goto fail; |
| 1029 | |
| 1030 | if (!check_valid_pointer(s, page, object)) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1031 | slab_err(s, page, "Invalid object pointer 0x%p", object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1032 | goto fail; |
| 1033 | } |
| 1034 | |
| 1035 | if (on_freelist(s, page, object)) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1036 | object_err(s, page, object, "Object already free"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1037 | goto fail; |
| 1038 | } |
| 1039 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1040 | if (!check_object(s, page, object, SLUB_RED_ACTIVE)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1041 | return 0; |
| 1042 | |
| 1043 | if (unlikely(s != page->slab)) { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 1044 | if (!PageSlab(page)) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1045 | slab_err(s, page, "Attempt to free object(0x%p) " |
| 1046 | "outside of slab", object); |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 1047 | } else if (!page->slab) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1048 | printk(KERN_ERR |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1049 | "SLUB <none>: no slab for object 0x%p.\n", |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1050 | object); |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1051 | dump_stack(); |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1052 | } else |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1053 | object_err(s, page, object, |
| 1054 | "page slab pointer corrupt."); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1055 | goto fail; |
| 1056 | } |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1057 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1058 | if (s->flags & SLAB_STORE_USER) |
| 1059 | set_track(s, object, TRACK_FREE, addr); |
| 1060 | trace(s, page, object, 0); |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1061 | init_object(s, object, SLUB_RED_INACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1062 | return 1; |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1063 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1064 | fail: |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1065 | slab_fix(s, "Object at 0x%p not freed", object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1066 | return 0; |
| 1067 | } |
| 1068 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1069 | static int __init setup_slub_debug(char *str) |
| 1070 | { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1071 | slub_debug = DEBUG_DEFAULT_FLAGS; |
| 1072 | if (*str++ != '=' || !*str) |
| 1073 | /* |
| 1074 | * No options specified. Switch on full debugging. |
| 1075 | */ |
| 1076 | goto out; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1077 | |
| 1078 | if (*str == ',') |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1079 | /* |
| 1080 | * No options but restriction on slabs. This means full |
| 1081 | * debugging for slabs matching a pattern. |
| 1082 | */ |
| 1083 | goto check_slabs; |
| 1084 | |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 1085 | if (tolower(*str) == 'o') { |
| 1086 | /* |
| 1087 | * Avoid enabling debugging on caches if its minimum order |
| 1088 | * would increase as a result. |
| 1089 | */ |
| 1090 | disable_higher_order_debug = 1; |
| 1091 | goto out; |
| 1092 | } |
| 1093 | |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1094 | slub_debug = 0; |
| 1095 | if (*str == '-') |
| 1096 | /* |
| 1097 | * Switch off all debugging measures. |
| 1098 | */ |
| 1099 | goto out; |
| 1100 | |
| 1101 | /* |
| 1102 | * Determine which debug features should be switched on |
| 1103 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1104 | for (; *str && *str != ','; str++) { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1105 | switch (tolower(*str)) { |
| 1106 | case 'f': |
| 1107 | slub_debug |= SLAB_DEBUG_FREE; |
| 1108 | break; |
| 1109 | case 'z': |
| 1110 | slub_debug |= SLAB_RED_ZONE; |
| 1111 | break; |
| 1112 | case 'p': |
| 1113 | slub_debug |= SLAB_POISON; |
| 1114 | break; |
| 1115 | case 'u': |
| 1116 | slub_debug |= SLAB_STORE_USER; |
| 1117 | break; |
| 1118 | case 't': |
| 1119 | slub_debug |= SLAB_TRACE; |
| 1120 | break; |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 1121 | case 'a': |
| 1122 | slub_debug |= SLAB_FAILSLAB; |
| 1123 | break; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1124 | default: |
| 1125 | printk(KERN_ERR "slub_debug option '%c' " |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1126 | "unknown. skipped\n", *str); |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1127 | } |
| 1128 | } |
| 1129 | |
| 1130 | check_slabs: |
| 1131 | if (*str == ',') |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1132 | slub_debug_slabs = str + 1; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1133 | out: |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1134 | return 1; |
| 1135 | } |
| 1136 | |
| 1137 | __setup("slub_debug", setup_slub_debug); |
| 1138 | |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1139 | static unsigned long kmem_cache_flags(unsigned long objsize, |
| 1140 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1141 | void (*ctor)(void *)) |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1142 | { |
| 1143 | /* |
Christoph Lameter | e153362 | 2008-02-15 23:45:24 -0800 | [diff] [blame] | 1144 | * Enable debugging if selected on the kernel commandline. |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1145 | */ |
Christoph Lameter | e153362 | 2008-02-15 23:45:24 -0800 | [diff] [blame] | 1146 | if (slub_debug && (!slub_debug_slabs || |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 1147 | !strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs)))) |
| 1148 | flags |= slub_debug; |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1149 | |
| 1150 | return flags; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1151 | } |
| 1152 | #else |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1153 | static inline void setup_object_debug(struct kmem_cache *s, |
| 1154 | struct page *page, void *object) {} |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1155 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1156 | static inline int alloc_debug_processing(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1157 | struct page *page, void *object, unsigned long addr) { return 0; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1158 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1159 | static inline int free_debug_processing(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1160 | struct page *page, void *object, unsigned long addr) { return 0; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1161 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1162 | static inline int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 1163 | { return 1; } |
| 1164 | static inline int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1165 | void *object, u8 val) { return 1; } |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1166 | static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, |
| 1167 | struct page *page) {} |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1168 | static inline void remove_full(struct kmem_cache *s, struct page *page) {} |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1169 | static inline unsigned long kmem_cache_flags(unsigned long objsize, |
| 1170 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1171 | void (*ctor)(void *)) |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1172 | { |
| 1173 | return flags; |
| 1174 | } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1175 | #define slub_debug 0 |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1176 | |
Ingo Molnar | fdaa45e | 2009-09-15 11:00:26 +0200 | [diff] [blame] | 1177 | #define disable_higher_order_debug 0 |
| 1178 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1179 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 1180 | { return 0; } |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1181 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 1182 | { return 0; } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1183 | static inline void inc_slabs_node(struct kmem_cache *s, int node, |
| 1184 | int objects) {} |
| 1185 | static inline void dec_slabs_node(struct kmem_cache *s, int node, |
| 1186 | int objects) {} |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1187 | |
| 1188 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) |
| 1189 | { return 0; } |
| 1190 | |
| 1191 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, |
| 1192 | void *object) {} |
| 1193 | |
| 1194 | static inline void slab_free_hook(struct kmem_cache *s, void *x) {} |
| 1195 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 1196 | #endif /* CONFIG_SLUB_DEBUG */ |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1197 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1198 | /* |
| 1199 | * Slab allocation and freeing |
| 1200 | */ |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1201 | static inline struct page *alloc_slab_page(gfp_t flags, int node, |
| 1202 | struct kmem_cache_order_objects oo) |
| 1203 | { |
| 1204 | int order = oo_order(oo); |
| 1205 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1206 | flags |= __GFP_NOTRACK; |
| 1207 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1208 | if (node == NUMA_NO_NODE) |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1209 | return alloc_pages(flags, order); |
| 1210 | else |
Minchan Kim | 6b65aaf | 2010-04-14 23:58:36 +0900 | [diff] [blame] | 1211 | return alloc_pages_exact_node(node, flags, order); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1212 | } |
| 1213 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1214 | static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1215 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1216 | struct page *page; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1217 | struct kmem_cache_order_objects oo = s->oo; |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1218 | gfp_t alloc_gfp; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1219 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1220 | flags &= gfp_allowed_mask; |
| 1221 | |
| 1222 | if (flags & __GFP_WAIT) |
| 1223 | local_irq_enable(); |
| 1224 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 1225 | flags |= s->allocflags; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1226 | |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1227 | /* |
| 1228 | * Let the initial higher-order allocation fail under memory pressure |
| 1229 | * so we fall-back to the minimum order allocation. |
| 1230 | */ |
| 1231 | alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; |
| 1232 | |
| 1233 | page = alloc_slab_page(alloc_gfp, node, oo); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1234 | if (unlikely(!page)) { |
| 1235 | oo = s->min; |
| 1236 | /* |
| 1237 | * Allocation may have failed due to fragmentation. |
| 1238 | * Try a lower order alloc if possible |
| 1239 | */ |
| 1240 | page = alloc_slab_page(flags, node, oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1241 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1242 | if (page) |
| 1243 | stat(s, ORDER_FALLBACK); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1244 | } |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1245 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1246 | if (flags & __GFP_WAIT) |
| 1247 | local_irq_disable(); |
| 1248 | |
| 1249 | if (!page) |
| 1250 | return NULL; |
| 1251 | |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1252 | if (kmemcheck_enabled |
Amerigo Wang | 5086c38 | 2009-08-19 21:44:13 +0300 | [diff] [blame] | 1253 | && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1254 | int pages = 1 << oo_order(oo); |
| 1255 | |
| 1256 | kmemcheck_alloc_shadow(page, oo_order(oo), flags, node); |
| 1257 | |
| 1258 | /* |
| 1259 | * Objects from caches that have a constructor don't get |
| 1260 | * cleared when they're allocated, so we need to do it here. |
| 1261 | */ |
| 1262 | if (s->ctor) |
| 1263 | kmemcheck_mark_uninitialized_pages(page, pages); |
| 1264 | else |
| 1265 | kmemcheck_mark_unallocated_pages(page, pages); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1266 | } |
| 1267 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1268 | page->objects = oo_objects(oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1269 | mod_zone_page_state(page_zone(page), |
| 1270 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1271 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1272 | 1 << oo_order(oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1273 | |
| 1274 | return page; |
| 1275 | } |
| 1276 | |
| 1277 | static void setup_object(struct kmem_cache *s, struct page *page, |
| 1278 | void *object) |
| 1279 | { |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1280 | setup_object_debug(s, page, object); |
Christoph Lameter | 4f10493 | 2007-05-06 14:50:17 -0700 | [diff] [blame] | 1281 | if (unlikely(s->ctor)) |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1282 | s->ctor(object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1283 | } |
| 1284 | |
| 1285 | static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1286 | { |
| 1287 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1288 | void *start; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1289 | void *last; |
| 1290 | void *p; |
| 1291 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 1292 | BUG_ON(flags & GFP_SLAB_BUG_MASK); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1293 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 1294 | page = allocate_slab(s, |
| 1295 | flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1296 | if (!page) |
| 1297 | goto out; |
| 1298 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1299 | inc_slabs_node(s, page_to_nid(page), page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1300 | page->slab = s; |
| 1301 | page->flags |= 1 << PG_slab; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1302 | |
| 1303 | start = page_address(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1304 | |
| 1305 | if (unlikely(s->flags & SLAB_POISON)) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1306 | memset(start, POISON_INUSE, PAGE_SIZE << compound_order(page)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1307 | |
| 1308 | last = start; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1309 | for_each_object(p, s, start, page->objects) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1310 | setup_object(s, page, last); |
| 1311 | set_freepointer(s, last, p); |
| 1312 | last = p; |
| 1313 | } |
| 1314 | setup_object(s, page, last); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1315 | set_freepointer(s, last, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1316 | |
| 1317 | page->freelist = start; |
| 1318 | page->inuse = 0; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 1319 | page->frozen = 1; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1320 | out: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1321 | return page; |
| 1322 | } |
| 1323 | |
| 1324 | static void __free_slab(struct kmem_cache *s, struct page *page) |
| 1325 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1326 | int order = compound_order(page); |
| 1327 | int pages = 1 << order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1328 | |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 1329 | if (kmem_cache_debug(s)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1330 | void *p; |
| 1331 | |
| 1332 | slab_pad_check(s, page); |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1333 | for_each_object(p, s, page_address(page), |
| 1334 | page->objects) |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1335 | check_object(s, page, p, SLUB_RED_INACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1336 | } |
| 1337 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1338 | kmemcheck_free_shadow(page, compound_order(page)); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1339 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1340 | mod_zone_page_state(page_zone(page), |
| 1341 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1342 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1343 | -pages); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1344 | |
Christoph Lameter | 49bd522 | 2008-04-14 18:52:18 +0300 | [diff] [blame] | 1345 | __ClearPageSlab(page); |
| 1346 | reset_page_mapcount(page); |
Nick Piggin | 1eb5ac6 | 2009-05-05 19:13:44 +1000 | [diff] [blame] | 1347 | if (current->reclaim_state) |
| 1348 | current->reclaim_state->reclaimed_slab += pages; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1349 | __free_pages(page, order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1350 | } |
| 1351 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1352 | #define need_reserve_slab_rcu \ |
| 1353 | (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)) |
| 1354 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1355 | static void rcu_free_slab(struct rcu_head *h) |
| 1356 | { |
| 1357 | struct page *page; |
| 1358 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1359 | if (need_reserve_slab_rcu) |
| 1360 | page = virt_to_head_page(h); |
| 1361 | else |
| 1362 | page = container_of((struct list_head *)h, struct page, lru); |
| 1363 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1364 | __free_slab(page->slab, page); |
| 1365 | } |
| 1366 | |
| 1367 | static void free_slab(struct kmem_cache *s, struct page *page) |
| 1368 | { |
| 1369 | if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) { |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1370 | struct rcu_head *head; |
| 1371 | |
| 1372 | if (need_reserve_slab_rcu) { |
| 1373 | int order = compound_order(page); |
| 1374 | int offset = (PAGE_SIZE << order) - s->reserved; |
| 1375 | |
| 1376 | VM_BUG_ON(s->reserved != sizeof(*head)); |
| 1377 | head = page_address(page) + offset; |
| 1378 | } else { |
| 1379 | /* |
| 1380 | * RCU free overloads the RCU head over the LRU |
| 1381 | */ |
| 1382 | head = (void *)&page->lru; |
| 1383 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1384 | |
| 1385 | call_rcu(head, rcu_free_slab); |
| 1386 | } else |
| 1387 | __free_slab(s, page); |
| 1388 | } |
| 1389 | |
| 1390 | static void discard_slab(struct kmem_cache *s, struct page *page) |
| 1391 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1392 | dec_slabs_node(s, page_to_nid(page), page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1393 | free_slab(s, page); |
| 1394 | } |
| 1395 | |
| 1396 | /* |
| 1397 | * Per slab locking using the pagelock |
| 1398 | */ |
| 1399 | static __always_inline void slab_lock(struct page *page) |
| 1400 | { |
| 1401 | bit_spin_lock(PG_locked, &page->flags); |
| 1402 | } |
| 1403 | |
| 1404 | static __always_inline void slab_unlock(struct page *page) |
| 1405 | { |
Nick Piggin | a76d354 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1406 | __bit_spin_unlock(PG_locked, &page->flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1407 | } |
| 1408 | |
| 1409 | static __always_inline int slab_trylock(struct page *page) |
| 1410 | { |
| 1411 | int rc = 1; |
| 1412 | |
| 1413 | rc = bit_spin_trylock(PG_locked, &page->flags); |
| 1414 | return rc; |
| 1415 | } |
| 1416 | |
| 1417 | /* |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1418 | * Management of partially allocated slabs. |
| 1419 | * |
| 1420 | * list_lock must be held. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1421 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1422 | static inline void add_partial(struct kmem_cache_node *n, |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1423 | struct page *page, int tail) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1424 | { |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 1425 | n->nr_partial++; |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1426 | if (tail) |
| 1427 | list_add_tail(&page->lru, &n->partial); |
| 1428 | else |
| 1429 | list_add(&page->lru, &n->partial); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1430 | } |
| 1431 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1432 | /* |
| 1433 | * list_lock must be held. |
| 1434 | */ |
| 1435 | static inline void remove_partial(struct kmem_cache_node *n, |
Christoph Lameter | 62e346a | 2010-09-28 08:10:28 -0500 | [diff] [blame] | 1436 | struct page *page) |
| 1437 | { |
| 1438 | list_del(&page->lru); |
| 1439 | n->nr_partial--; |
| 1440 | } |
| 1441 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1442 | /* |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1443 | * Lock slab, remove from the partial list and put the object into the |
| 1444 | * per cpu freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1445 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1446 | * Must hold list_lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1447 | */ |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1448 | static inline int lock_and_freeze_slab(struct kmem_cache *s, |
| 1449 | struct kmem_cache_node *n, struct page *page) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1450 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1451 | void *freelist; |
| 1452 | unsigned long counters; |
| 1453 | struct page new; |
| 1454 | |
| 1455 | |
| 1456 | if (!slab_trylock(page)) |
| 1457 | return 0; |
| 1458 | |
| 1459 | /* |
| 1460 | * Zap the freelist and set the frozen bit. |
| 1461 | * The old freelist is the list of objects for the |
| 1462 | * per cpu allocation list. |
| 1463 | */ |
| 1464 | do { |
| 1465 | freelist = page->freelist; |
| 1466 | counters = page->counters; |
| 1467 | new.counters = counters; |
| 1468 | new.inuse = page->objects; |
| 1469 | |
| 1470 | VM_BUG_ON(new.frozen); |
| 1471 | new.frozen = 1; |
| 1472 | |
| 1473 | } while (!cmpxchg_double_slab(s, page, |
| 1474 | freelist, counters, |
| 1475 | NULL, new.counters, |
| 1476 | "lock and freeze")); |
| 1477 | |
| 1478 | remove_partial(n, page); |
| 1479 | |
| 1480 | if (freelist) { |
| 1481 | /* Populate the per cpu freelist */ |
| 1482 | this_cpu_write(s->cpu_slab->freelist, freelist); |
| 1483 | this_cpu_write(s->cpu_slab->page, page); |
| 1484 | this_cpu_write(s->cpu_slab->node, page_to_nid(page)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1485 | return 1; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1486 | } else { |
| 1487 | /* |
| 1488 | * Slab page came from the wrong list. No object to allocate |
| 1489 | * from. Put it onto the correct list and continue partial |
| 1490 | * scan. |
| 1491 | */ |
| 1492 | printk(KERN_ERR "SLUB: %s : Page without available objects on" |
| 1493 | " partial list\n", s->name); |
| 1494 | slab_unlock(page); |
| 1495 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1496 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1497 | } |
| 1498 | |
| 1499 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1500 | * Try to allocate a partial slab from a specific node. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1501 | */ |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1502 | static struct page *get_partial_node(struct kmem_cache *s, |
| 1503 | struct kmem_cache_node *n) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1504 | { |
| 1505 | struct page *page; |
| 1506 | |
| 1507 | /* |
| 1508 | * Racy check. If we mistakenly see no partial slabs then we |
| 1509 | * just allocate an empty slab. If we mistakenly try to get a |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1510 | * partial slab and there is none available then get_partials() |
| 1511 | * will return NULL. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1512 | */ |
| 1513 | if (!n || !n->nr_partial) |
| 1514 | return NULL; |
| 1515 | |
| 1516 | spin_lock(&n->list_lock); |
| 1517 | list_for_each_entry(page, &n->partial, lru) |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1518 | if (lock_and_freeze_slab(s, n, page)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1519 | goto out; |
| 1520 | page = NULL; |
| 1521 | out: |
| 1522 | spin_unlock(&n->list_lock); |
| 1523 | return page; |
| 1524 | } |
| 1525 | |
| 1526 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1527 | * Get a page from somewhere. Search in increasing NUMA distances. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1528 | */ |
| 1529 | static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags) |
| 1530 | { |
| 1531 | #ifdef CONFIG_NUMA |
| 1532 | struct zonelist *zonelist; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1533 | struct zoneref *z; |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1534 | struct zone *zone; |
| 1535 | enum zone_type high_zoneidx = gfp_zone(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1536 | struct page *page; |
| 1537 | |
| 1538 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1539 | * The defrag ratio allows a configuration of the tradeoffs between |
| 1540 | * inter node defragmentation and node local allocations. A lower |
| 1541 | * defrag_ratio increases the tendency to do local allocations |
| 1542 | * instead of attempting to obtain partial slabs from other nodes. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1543 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1544 | * If the defrag_ratio is set to 0 then kmalloc() always |
| 1545 | * returns node local objects. If the ratio is higher then kmalloc() |
| 1546 | * may return off node objects because partial slabs are obtained |
| 1547 | * from other nodes and filled up. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1548 | * |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1549 | * 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] | 1550 | * defrag_ratio = 1000) then every (well almost) allocation will |
| 1551 | * first attempt to defrag slab caches on other nodes. This means |
| 1552 | * scanning over all nodes to look for partial slabs which may be |
| 1553 | * expensive if we do it every time we are trying to find a slab |
| 1554 | * with available objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1555 | */ |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 1556 | if (!s->remote_node_defrag_ratio || |
| 1557 | get_cycles() % 1024 > s->remote_node_defrag_ratio) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1558 | return NULL; |
| 1559 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1560 | get_mems_allowed(); |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1561 | zonelist = node_zonelist(slab_node(current->mempolicy), flags); |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1562 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1563 | struct kmem_cache_node *n; |
| 1564 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1565 | n = get_node(s, zone_to_nid(zone)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1566 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1567 | if (n && cpuset_zone_allowed_hardwall(zone, flags) && |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 1568 | n->nr_partial > s->min_partial) { |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1569 | page = get_partial_node(s, n); |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1570 | if (page) { |
| 1571 | put_mems_allowed(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1572 | return page; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1573 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1574 | } |
| 1575 | } |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1576 | put_mems_allowed(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1577 | #endif |
| 1578 | return NULL; |
| 1579 | } |
| 1580 | |
| 1581 | /* |
| 1582 | * Get a partial page, lock it and return it. |
| 1583 | */ |
| 1584 | static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node) |
| 1585 | { |
| 1586 | struct page *page; |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1587 | int searchnode = (node == NUMA_NO_NODE) ? numa_node_id() : node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1588 | |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1589 | page = get_partial_node(s, get_node(s, searchnode)); |
Christoph Lameter | 33de04e | 2011-04-15 14:48:12 -0500 | [diff] [blame] | 1590 | if (page || node != NUMA_NO_NODE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1591 | return page; |
| 1592 | |
| 1593 | return get_any_partial(s, flags); |
| 1594 | } |
| 1595 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1596 | #ifdef CONFIG_PREEMPT |
| 1597 | /* |
| 1598 | * Calculate the next globally unique transaction for disambiguiation |
| 1599 | * during cmpxchg. The transactions start with the cpu number and are then |
| 1600 | * incremented by CONFIG_NR_CPUS. |
| 1601 | */ |
| 1602 | #define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS) |
| 1603 | #else |
| 1604 | /* |
| 1605 | * No preemption supported therefore also no need to check for |
| 1606 | * different cpus. |
| 1607 | */ |
| 1608 | #define TID_STEP 1 |
| 1609 | #endif |
| 1610 | |
| 1611 | static inline unsigned long next_tid(unsigned long tid) |
| 1612 | { |
| 1613 | return tid + TID_STEP; |
| 1614 | } |
| 1615 | |
| 1616 | static inline unsigned int tid_to_cpu(unsigned long tid) |
| 1617 | { |
| 1618 | return tid % TID_STEP; |
| 1619 | } |
| 1620 | |
| 1621 | static inline unsigned long tid_to_event(unsigned long tid) |
| 1622 | { |
| 1623 | return tid / TID_STEP; |
| 1624 | } |
| 1625 | |
| 1626 | static inline unsigned int init_tid(int cpu) |
| 1627 | { |
| 1628 | return cpu; |
| 1629 | } |
| 1630 | |
| 1631 | static inline void note_cmpxchg_failure(const char *n, |
| 1632 | const struct kmem_cache *s, unsigned long tid) |
| 1633 | { |
| 1634 | #ifdef SLUB_DEBUG_CMPXCHG |
| 1635 | unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid); |
| 1636 | |
| 1637 | printk(KERN_INFO "%s %s: cmpxchg redo ", n, s->name); |
| 1638 | |
| 1639 | #ifdef CONFIG_PREEMPT |
| 1640 | if (tid_to_cpu(tid) != tid_to_cpu(actual_tid)) |
| 1641 | printk("due to cpu change %d -> %d\n", |
| 1642 | tid_to_cpu(tid), tid_to_cpu(actual_tid)); |
| 1643 | else |
| 1644 | #endif |
| 1645 | if (tid_to_event(tid) != tid_to_event(actual_tid)) |
| 1646 | printk("due to cpu running other code. Event %ld->%ld\n", |
| 1647 | tid_to_event(tid), tid_to_event(actual_tid)); |
| 1648 | else |
| 1649 | printk("for unknown reason: actual=%lx was=%lx target=%lx\n", |
| 1650 | actual_tid, tid, next_tid(tid)); |
| 1651 | #endif |
Christoph Lameter | 4fdccdf | 2011-03-22 13:35:00 -0500 | [diff] [blame] | 1652 | stat(s, CMPXCHG_DOUBLE_CPU_FAIL); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1653 | } |
| 1654 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1655 | void init_kmem_cache_cpus(struct kmem_cache *s) |
| 1656 | { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1657 | int cpu; |
| 1658 | |
| 1659 | for_each_possible_cpu(cpu) |
| 1660 | per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1661 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1662 | /* |
| 1663 | * Remove the cpu slab |
| 1664 | */ |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1665 | |
| 1666 | /* |
| 1667 | * Remove the cpu slab |
| 1668 | */ |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1669 | static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1670 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1671 | enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1672 | struct page *page = c->page; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1673 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
| 1674 | int lock = 0; |
| 1675 | enum slab_modes l = M_NONE, m = M_NONE; |
| 1676 | void *freelist; |
| 1677 | void *nextfree; |
| 1678 | int tail = 0; |
| 1679 | struct page new; |
| 1680 | struct page old; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 1681 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1682 | if (page->freelist) { |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 1683 | stat(s, DEACTIVATE_REMOTE_FREES); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1684 | tail = 1; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1685 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1686 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1687 | c->tid = next_tid(c->tid); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1688 | c->page = NULL; |
| 1689 | freelist = c->freelist; |
| 1690 | c->freelist = NULL; |
| 1691 | |
| 1692 | /* |
| 1693 | * Stage one: Free all available per cpu objects back |
| 1694 | * to the page freelist while it is still frozen. Leave the |
| 1695 | * last one. |
| 1696 | * |
| 1697 | * There is no need to take the list->lock because the page |
| 1698 | * is still frozen. |
| 1699 | */ |
| 1700 | while (freelist && (nextfree = get_freepointer(s, freelist))) { |
| 1701 | void *prior; |
| 1702 | unsigned long counters; |
| 1703 | |
| 1704 | do { |
| 1705 | prior = page->freelist; |
| 1706 | counters = page->counters; |
| 1707 | set_freepointer(s, freelist, prior); |
| 1708 | new.counters = counters; |
| 1709 | new.inuse--; |
| 1710 | VM_BUG_ON(!new.frozen); |
| 1711 | |
| 1712 | } while (!cmpxchg_double_slab(s, page, |
| 1713 | prior, counters, |
| 1714 | freelist, new.counters, |
| 1715 | "drain percpu freelist")); |
| 1716 | |
| 1717 | freelist = nextfree; |
| 1718 | } |
| 1719 | |
| 1720 | /* |
| 1721 | * Stage two: Ensure that the page is unfrozen while the |
| 1722 | * list presence reflects the actual number of objects |
| 1723 | * during unfreeze. |
| 1724 | * |
| 1725 | * We setup the list membership and then perform a cmpxchg |
| 1726 | * with the count. If there is a mismatch then the page |
| 1727 | * is not unfrozen but the page is on the wrong list. |
| 1728 | * |
| 1729 | * Then we restart the process which may have to remove |
| 1730 | * the page from the list that we just put it on again |
| 1731 | * because the number of objects in the slab may have |
| 1732 | * changed. |
| 1733 | */ |
| 1734 | redo: |
| 1735 | |
| 1736 | old.freelist = page->freelist; |
| 1737 | old.counters = page->counters; |
| 1738 | VM_BUG_ON(!old.frozen); |
| 1739 | |
| 1740 | /* Determine target state of the slab */ |
| 1741 | new.counters = old.counters; |
| 1742 | if (freelist) { |
| 1743 | new.inuse--; |
| 1744 | set_freepointer(s, freelist, old.freelist); |
| 1745 | new.freelist = freelist; |
| 1746 | } else |
| 1747 | new.freelist = old.freelist; |
| 1748 | |
| 1749 | new.frozen = 0; |
| 1750 | |
| 1751 | if (!new.inuse && n->nr_partial < s->min_partial) |
| 1752 | m = M_FREE; |
| 1753 | else if (new.freelist) { |
| 1754 | m = M_PARTIAL; |
| 1755 | if (!lock) { |
| 1756 | lock = 1; |
| 1757 | /* |
| 1758 | * Taking the spinlock removes the possiblity |
| 1759 | * that acquire_slab() will see a slab page that |
| 1760 | * is frozen |
| 1761 | */ |
| 1762 | spin_lock(&n->list_lock); |
| 1763 | } |
| 1764 | } else { |
| 1765 | m = M_FULL; |
| 1766 | if (kmem_cache_debug(s) && !lock) { |
| 1767 | lock = 1; |
| 1768 | /* |
| 1769 | * This also ensures that the scanning of full |
| 1770 | * slabs from diagnostic functions will not see |
| 1771 | * any frozen slabs. |
| 1772 | */ |
| 1773 | spin_lock(&n->list_lock); |
| 1774 | } |
| 1775 | } |
| 1776 | |
| 1777 | if (l != m) { |
| 1778 | |
| 1779 | if (l == M_PARTIAL) |
| 1780 | |
| 1781 | remove_partial(n, page); |
| 1782 | |
| 1783 | else if (l == M_FULL) |
| 1784 | |
| 1785 | remove_full(s, page); |
| 1786 | |
| 1787 | if (m == M_PARTIAL) { |
| 1788 | |
| 1789 | add_partial(n, page, tail); |
| 1790 | stat(s, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD); |
| 1791 | |
| 1792 | } else if (m == M_FULL) { |
| 1793 | |
| 1794 | stat(s, DEACTIVATE_FULL); |
| 1795 | add_full(s, n, page); |
| 1796 | |
| 1797 | } |
| 1798 | } |
| 1799 | |
| 1800 | l = m; |
| 1801 | if (!cmpxchg_double_slab(s, page, |
| 1802 | old.freelist, old.counters, |
| 1803 | new.freelist, new.counters, |
| 1804 | "unfreezing slab")) |
| 1805 | goto redo; |
| 1806 | |
| 1807 | slab_unlock(page); |
| 1808 | |
| 1809 | if (lock) |
| 1810 | spin_unlock(&n->list_lock); |
| 1811 | |
| 1812 | if (m == M_FREE) { |
| 1813 | stat(s, DEACTIVATE_EMPTY); |
| 1814 | discard_slab(s, page); |
| 1815 | stat(s, FREE_SLAB); |
| 1816 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1817 | } |
| 1818 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1819 | 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] | 1820 | { |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 1821 | stat(s, CPUSLAB_FLUSH); |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1822 | slab_lock(c->page); |
| 1823 | deactivate_slab(s, c); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1824 | } |
| 1825 | |
| 1826 | /* |
| 1827 | * Flush cpu slab. |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1828 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1829 | * Called from IPI handler with interrupts disabled. |
| 1830 | */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 1831 | static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1832 | { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 1833 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1834 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1835 | if (likely(c && c->page)) |
| 1836 | flush_slab(s, c); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1837 | } |
| 1838 | |
| 1839 | static void flush_cpu_slab(void *d) |
| 1840 | { |
| 1841 | struct kmem_cache *s = d; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1842 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1843 | __flush_cpu_slab(s, smp_processor_id()); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1844 | } |
| 1845 | |
| 1846 | static void flush_all(struct kmem_cache *s) |
| 1847 | { |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 1848 | on_each_cpu(flush_cpu_slab, s, 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1849 | } |
| 1850 | |
| 1851 | /* |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1852 | * Check if the objects in a per cpu structure fit numa |
| 1853 | * locality expectations. |
| 1854 | */ |
| 1855 | static inline int node_match(struct kmem_cache_cpu *c, int node) |
| 1856 | { |
| 1857 | #ifdef CONFIG_NUMA |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1858 | if (node != NUMA_NO_NODE && c->node != node) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1859 | return 0; |
| 1860 | #endif |
| 1861 | return 1; |
| 1862 | } |
| 1863 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1864 | static int count_free(struct page *page) |
| 1865 | { |
| 1866 | return page->objects - page->inuse; |
| 1867 | } |
| 1868 | |
| 1869 | static unsigned long count_partial(struct kmem_cache_node *n, |
| 1870 | int (*get_count)(struct page *)) |
| 1871 | { |
| 1872 | unsigned long flags; |
| 1873 | unsigned long x = 0; |
| 1874 | struct page *page; |
| 1875 | |
| 1876 | spin_lock_irqsave(&n->list_lock, flags); |
| 1877 | list_for_each_entry(page, &n->partial, lru) |
| 1878 | x += get_count(page); |
| 1879 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 1880 | return x; |
| 1881 | } |
| 1882 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1883 | static inline unsigned long node_nr_objs(struct kmem_cache_node *n) |
| 1884 | { |
| 1885 | #ifdef CONFIG_SLUB_DEBUG |
| 1886 | return atomic_long_read(&n->total_objects); |
| 1887 | #else |
| 1888 | return 0; |
| 1889 | #endif |
| 1890 | } |
| 1891 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1892 | static noinline void |
| 1893 | slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid) |
| 1894 | { |
| 1895 | int node; |
| 1896 | |
| 1897 | printk(KERN_WARNING |
| 1898 | "SLUB: Unable to allocate memory on node %d (gfp=0x%x)\n", |
| 1899 | nid, gfpflags); |
| 1900 | printk(KERN_WARNING " cache: %s, object size: %d, buffer size: %d, " |
| 1901 | "default order: %d, min order: %d\n", s->name, s->objsize, |
| 1902 | s->size, oo_order(s->oo), oo_order(s->min)); |
| 1903 | |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 1904 | if (oo_order(s->min) > get_order(s->objsize)) |
| 1905 | printk(KERN_WARNING " %s debugging increased min order, use " |
| 1906 | "slub_debug=O to disable.\n", s->name); |
| 1907 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1908 | for_each_online_node(node) { |
| 1909 | struct kmem_cache_node *n = get_node(s, node); |
| 1910 | unsigned long nr_slabs; |
| 1911 | unsigned long nr_objs; |
| 1912 | unsigned long nr_free; |
| 1913 | |
| 1914 | if (!n) |
| 1915 | continue; |
| 1916 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1917 | nr_free = count_partial(n, count_free); |
| 1918 | nr_slabs = node_nr_slabs(n); |
| 1919 | nr_objs = node_nr_objs(n); |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1920 | |
| 1921 | printk(KERN_WARNING |
| 1922 | " node %d: slabs: %ld, objs: %ld, free: %ld\n", |
| 1923 | node, nr_slabs, nr_objs, nr_free); |
| 1924 | } |
| 1925 | } |
| 1926 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1927 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1928 | * Slow path. The lockless freelist is empty or we need to perform |
| 1929 | * debugging duties. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1930 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1931 | * Interrupts are disabled. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1932 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1933 | * Processing is still very fast if new objects have been freed to the |
| 1934 | * regular freelist. In that case we simply take over the regular freelist |
| 1935 | * as the lockless freelist and zap the regular freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1936 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1937 | * If that is not working then we fall back to the partial lists. We take the |
| 1938 | * first element of the freelist as the object to allocate now and move the |
| 1939 | * rest of the freelist to the lockless freelist. |
| 1940 | * |
| 1941 | * 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] | 1942 | * we need to allocate a new slab. This is the slowest path since it involves |
| 1943 | * 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] | 1944 | */ |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1945 | static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
| 1946 | unsigned long addr, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1947 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1948 | void **object; |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 1949 | struct page *page; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1950 | unsigned long flags; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1951 | struct page new; |
| 1952 | unsigned long counters; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1953 | |
| 1954 | local_irq_save(flags); |
| 1955 | #ifdef CONFIG_PREEMPT |
| 1956 | /* |
| 1957 | * We may have been preempted and rescheduled on a different |
| 1958 | * cpu before disabling interrupts. Need to reload cpu area |
| 1959 | * pointer. |
| 1960 | */ |
| 1961 | c = this_cpu_ptr(s->cpu_slab); |
| 1962 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1963 | |
Linus Torvalds | e72e9c2 | 2008-03-27 20:56:33 -0700 | [diff] [blame] | 1964 | /* We handle __GFP_ZERO in the caller */ |
| 1965 | gfpflags &= ~__GFP_ZERO; |
| 1966 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 1967 | page = c->page; |
| 1968 | if (!page) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1969 | goto new_slab; |
| 1970 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 1971 | slab_lock(page); |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1972 | if (unlikely(!node_match(c, node))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1973 | goto another_slab; |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1974 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1975 | stat(s, ALLOC_SLOWPATH); |
| 1976 | |
| 1977 | do { |
| 1978 | object = page->freelist; |
| 1979 | counters = page->counters; |
| 1980 | new.counters = counters; |
| 1981 | new.inuse = page->objects; |
| 1982 | VM_BUG_ON(!new.frozen); |
| 1983 | |
| 1984 | } while (!cmpxchg_double_slab(s, page, |
| 1985 | object, counters, |
| 1986 | NULL, new.counters, |
| 1987 | "__slab_alloc")); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1988 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1989 | load_freelist: |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 1990 | VM_BUG_ON(!page->frozen); |
| 1991 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1992 | if (unlikely(!object)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1993 | goto another_slab; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1994 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1995 | stat(s, ALLOC_REFILL); |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 1996 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 1997 | slab_unlock(page); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 1998 | |
| 1999 | c->freelist = get_freepointer(s, object); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2000 | c->tid = next_tid(c->tid); |
| 2001 | local_irq_restore(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2002 | return object; |
| 2003 | |
| 2004 | another_slab: |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2005 | deactivate_slab(s, c); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2006 | |
| 2007 | new_slab: |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2008 | page = get_partial(s, gfpflags, node); |
| 2009 | if (page) { |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2010 | stat(s, ALLOC_FROM_PARTIAL); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2011 | object = c->freelist; |
| 2012 | |
| 2013 | if (kmem_cache_debug(s)) |
| 2014 | goto debug; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2015 | goto load_freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2016 | } |
| 2017 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2018 | page = new_slab(s, gfpflags, node); |
Christoph Lameter | b811c20 | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 2019 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2020 | if (page) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2021 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | 05aa345 | 2007-11-05 11:31:58 -0800 | [diff] [blame] | 2022 | if (c->page) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2023 | flush_slab(s, c); |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2024 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2025 | /* |
| 2026 | * No other reference to the page yet so we can |
| 2027 | * muck around with it freely without cmpxchg |
| 2028 | */ |
| 2029 | object = page->freelist; |
| 2030 | page->freelist = NULL; |
| 2031 | page->inuse = page->objects; |
| 2032 | |
| 2033 | stat(s, ALLOC_SLAB); |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2034 | slab_lock(page); |
David Rientjes | bd07d87 | 2011-05-12 13:10:49 -0700 | [diff] [blame] | 2035 | c->node = page_to_nid(page); |
| 2036 | c->page = page; |
Christoph Lameter | 4b6f075 | 2007-05-16 22:10:53 -0700 | [diff] [blame] | 2037 | goto load_freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2038 | } |
Pekka Enberg | 95f8598 | 2009-06-11 16:18:09 +0300 | [diff] [blame] | 2039 | if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit()) |
| 2040 | slab_out_of_memory(s, gfpflags, node); |
Christoph Lameter | 2fd66c5 | 2011-03-22 13:32:53 -0500 | [diff] [blame] | 2041 | local_irq_restore(flags); |
Christoph Lameter | 71c7a06 | 2008-02-14 14:28:01 -0800 | [diff] [blame] | 2042 | return NULL; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2043 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2044 | debug: |
| 2045 | if (!object || !alloc_debug_processing(s, page, object, addr)) |
| 2046 | goto new_slab; |
| 2047 | |
| 2048 | c->freelist = get_freepointer(s, object); |
Christoph Lameter | 442b06b | 2011-05-17 16:29:31 -0500 | [diff] [blame] | 2049 | deactivate_slab(s, c); |
| 2050 | c->page = NULL; |
Pekka Enberg | 15b7c51 | 2010-10-02 11:32:32 +0300 | [diff] [blame] | 2051 | c->node = NUMA_NO_NODE; |
Christoph Lameter | a71ae47 | 2011-05-25 09:47:43 -0500 | [diff] [blame] | 2052 | local_irq_restore(flags); |
| 2053 | return object; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2054 | } |
| 2055 | |
| 2056 | /* |
| 2057 | * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc) |
| 2058 | * have the fastpath folded into their functions. So no function call |
| 2059 | * overhead for requests that can be satisfied on the fastpath. |
| 2060 | * |
| 2061 | * The fastpath works by first checking if the lockless freelist can be used. |
| 2062 | * If not then __slab_alloc is called for slow processing. |
| 2063 | * |
| 2064 | * Otherwise we can simply pick the next object from the lockless free list. |
| 2065 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2066 | static __always_inline void *slab_alloc(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2067 | gfp_t gfpflags, int node, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2068 | { |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2069 | void **object; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2070 | struct kmem_cache_cpu *c; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2071 | unsigned long tid; |
Christoph Lameter | 1f84260 | 2008-01-07 23:20:30 -0800 | [diff] [blame] | 2072 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2073 | if (slab_pre_alloc_hook(s, gfpflags)) |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 2074 | return NULL; |
| 2075 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2076 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2077 | |
| 2078 | /* |
| 2079 | * Must read kmem_cache cpu data via this cpu ptr. Preemption is |
| 2080 | * enabled. We may switch back and forth between cpus while |
| 2081 | * reading from one cpu area. That does not matter as long |
| 2082 | * as we end up on the original cpu again when doing the cmpxchg. |
| 2083 | */ |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2084 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2085 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2086 | /* |
| 2087 | * The transaction ids are globally unique per cpu and per operation on |
| 2088 | * a per cpu queue. Thus they can be guarantee that the cmpxchg_double |
| 2089 | * occurs on the right processor and that there was no operation on the |
| 2090 | * linked list in between. |
| 2091 | */ |
| 2092 | tid = c->tid; |
| 2093 | barrier(); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2094 | |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2095 | object = c->freelist; |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2096 | if (unlikely(!object || !node_match(c, node))) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2097 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2098 | object = __slab_alloc(s, gfpflags, node, addr, c); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2099 | |
| 2100 | else { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2101 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2102 | * The cmpxchg will only match if there was no additional |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2103 | * operation and if we are on the right processor. |
| 2104 | * |
| 2105 | * The cmpxchg does the following atomically (without lock semantics!) |
| 2106 | * 1. Relocate first pointer to the current per cpu area. |
| 2107 | * 2. Verify that tid and freelist have not been changed |
| 2108 | * 3. If they were not changed replace tid and freelist |
| 2109 | * |
| 2110 | * Since this is without lock semantics the protection is only against |
| 2111 | * code executing on this cpu *not* from access by other cpus. |
| 2112 | */ |
Thomas Gleixner | 30106b8 | 2011-05-04 15:38:19 +0200 | [diff] [blame] | 2113 | if (unlikely(!irqsafe_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2114 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2115 | object, tid, |
Christoph Lameter | 1393d9a | 2011-05-16 15:26:08 -0500 | [diff] [blame] | 2116 | get_freepointer_safe(s, object), next_tid(tid)))) { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2117 | |
| 2118 | note_cmpxchg_failure("slab_alloc", s, tid); |
| 2119 | goto redo; |
| 2120 | } |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2121 | stat(s, ALLOC_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2122 | } |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2123 | |
Pekka Enberg | 74e2134 | 2009-11-25 20:14:48 +0200 | [diff] [blame] | 2124 | if (unlikely(gfpflags & __GFP_ZERO) && object) |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2125 | memset(object, 0, s->objsize); |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 2126 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2127 | slab_post_alloc_hook(s, gfpflags, object); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 2128 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2129 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2130 | } |
| 2131 | |
| 2132 | void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) |
| 2133 | { |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 2134 | void *ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2135 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2136 | trace_kmem_cache_alloc(_RET_IP_, ret, s->objsize, s->size, gfpflags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2137 | |
| 2138 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2139 | } |
| 2140 | EXPORT_SYMBOL(kmem_cache_alloc); |
| 2141 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2142 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2143 | 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] | 2144 | { |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2145 | void *ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_); |
| 2146 | trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); |
| 2147 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2148 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2149 | EXPORT_SYMBOL(kmem_cache_alloc_trace); |
| 2150 | |
| 2151 | void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) |
| 2152 | { |
| 2153 | void *ret = kmalloc_order(size, flags, order); |
| 2154 | trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << order, flags); |
| 2155 | return ret; |
| 2156 | } |
| 2157 | EXPORT_SYMBOL(kmalloc_order_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2158 | #endif |
| 2159 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2160 | #ifdef CONFIG_NUMA |
| 2161 | void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) |
| 2162 | { |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2163 | void *ret = slab_alloc(s, gfpflags, node, _RET_IP_); |
| 2164 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2165 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
| 2166 | s->objsize, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2167 | |
| 2168 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2169 | } |
| 2170 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2171 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2172 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2173 | void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2174 | gfp_t gfpflags, |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2175 | int node, size_t size) |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2176 | { |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2177 | void *ret = slab_alloc(s, gfpflags, node, _RET_IP_); |
| 2178 | |
| 2179 | trace_kmalloc_node(_RET_IP_, ret, |
| 2180 | size, s->size, gfpflags, node); |
| 2181 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2182 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2183 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2184 | #endif |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 2185 | #endif |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2186 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2187 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2188 | * Slow patch handling. This may still be called frequently since objects |
| 2189 | * have a longer lifetime than the cpu slabs in most processing loads. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2190 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2191 | * So we still attempt to reduce cache line usage. Just take the slab |
| 2192 | * lock and free the item. If there is no additional partial page |
| 2193 | * handling required then we can return immediately. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2194 | */ |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2195 | static void __slab_free(struct kmem_cache *s, struct page *page, |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2196 | void *x, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2197 | { |
| 2198 | void *prior; |
| 2199 | void **object = (void *)x; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2200 | int was_frozen; |
| 2201 | int inuse; |
| 2202 | struct page new; |
| 2203 | unsigned long counters; |
| 2204 | struct kmem_cache_node *n = NULL; |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 2205 | unsigned long uninitialized_var(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2206 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2207 | local_irq_save(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2208 | slab_lock(page); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2209 | stat(s, FREE_SLOWPATH); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2210 | |
Christoph Lameter | 8dc16c6 | 2011-04-15 14:48:16 -0500 | [diff] [blame] | 2211 | if (kmem_cache_debug(s) && !free_debug_processing(s, page, x, addr)) |
| 2212 | goto out_unlock; |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2213 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2214 | do { |
| 2215 | prior = page->freelist; |
| 2216 | counters = page->counters; |
| 2217 | set_freepointer(s, object, prior); |
| 2218 | new.counters = counters; |
| 2219 | was_frozen = new.frozen; |
| 2220 | new.inuse--; |
| 2221 | if ((!new.inuse || !prior) && !was_frozen && !n) { |
| 2222 | n = get_node(s, page_to_nid(page)); |
| 2223 | /* |
| 2224 | * Speculatively acquire the list_lock. |
| 2225 | * If the cmpxchg does not succeed then we may |
| 2226 | * drop the list_lock without any processing. |
| 2227 | * |
| 2228 | * Otherwise the list_lock will synchronize with |
| 2229 | * other processors updating the list of slabs. |
| 2230 | */ |
| 2231 | spin_lock(&n->list_lock); |
| 2232 | } |
| 2233 | inuse = new.inuse; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2234 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2235 | } while (!cmpxchg_double_slab(s, page, |
| 2236 | prior, counters, |
| 2237 | object, new.counters, |
| 2238 | "__slab_free")); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2239 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2240 | if (likely(!n)) { |
| 2241 | /* |
| 2242 | * The list lock was not taken therefore no list |
| 2243 | * activity can be necessary. |
| 2244 | */ |
| 2245 | if (was_frozen) |
| 2246 | stat(s, FREE_FROZEN); |
| 2247 | goto out_unlock; |
| 2248 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2249 | |
| 2250 | /* |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2251 | * was_frozen may have been set after we acquired the list_lock in |
| 2252 | * an earlier loop. So we need to check it here again. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2253 | */ |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2254 | if (was_frozen) |
| 2255 | stat(s, FREE_FROZEN); |
| 2256 | else { |
| 2257 | if (unlikely(!inuse && n->nr_partial > s->min_partial)) |
| 2258 | goto slab_empty; |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2259 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2260 | /* |
| 2261 | * Objects left in the slab. If it was not on the partial list before |
| 2262 | * then add it. |
| 2263 | */ |
| 2264 | if (unlikely(!prior)) { |
| 2265 | remove_full(s, page); |
| 2266 | add_partial(n, page, 0); |
| 2267 | stat(s, FREE_ADD_PARTIAL); |
| 2268 | } |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 2269 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2270 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2271 | spin_unlock(&n->list_lock); |
| 2272 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2273 | out_unlock: |
| 2274 | slab_unlock(page); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2275 | local_irq_restore(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2276 | return; |
| 2277 | |
| 2278 | slab_empty: |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 2279 | if (prior) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2280 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2281 | * Slab still on the partial list. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2282 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2283 | remove_partial(n, page); |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2284 | stat(s, FREE_REMOVE_PARTIAL); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 2285 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame^] | 2286 | |
| 2287 | spin_unlock(&n->list_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2288 | slab_unlock(page); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2289 | local_irq_restore(flags); |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2290 | stat(s, FREE_SLAB); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2291 | discard_slab(s, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2292 | } |
| 2293 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2294 | /* |
| 2295 | * Fastpath with forced inlining to produce a kfree and kmem_cache_free that |
| 2296 | * can perform fastpath freeing without additional function calls. |
| 2297 | * |
| 2298 | * The fastpath is only possible if we are freeing to the current cpu slab |
| 2299 | * of this processor. This typically the case if we have just allocated |
| 2300 | * the item before. |
| 2301 | * |
| 2302 | * If fastpath is not possible then fall back to __slab_free where we deal |
| 2303 | * with all sorts of special processing. |
| 2304 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2305 | static __always_inline void slab_free(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2306 | struct page *page, void *x, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2307 | { |
| 2308 | void **object = (void *)x; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2309 | struct kmem_cache_cpu *c; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2310 | unsigned long tid; |
Christoph Lameter | 1f84260 | 2008-01-07 23:20:30 -0800 | [diff] [blame] | 2311 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2312 | slab_free_hook(s, x); |
| 2313 | |
Christoph Lameter | a24c5a0 | 2011-03-15 12:45:21 -0500 | [diff] [blame] | 2314 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2315 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2316 | /* |
| 2317 | * Determine the currently cpus per cpu slab. |
| 2318 | * The cpu may change afterward. However that does not matter since |
| 2319 | * data is retrieved via this pointer. If we are on the same cpu |
| 2320 | * during the cmpxchg then the free will succedd. |
| 2321 | */ |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2322 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2323 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2324 | tid = c->tid; |
| 2325 | barrier(); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2326 | |
Christoph Lameter | 442b06b | 2011-05-17 16:29:31 -0500 | [diff] [blame] | 2327 | if (likely(page == c->page)) { |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2328 | set_freepointer(s, object, c->freelist); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2329 | |
Thomas Gleixner | 30106b8 | 2011-05-04 15:38:19 +0200 | [diff] [blame] | 2330 | if (unlikely(!irqsafe_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2331 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2332 | c->freelist, tid, |
| 2333 | object, next_tid(tid)))) { |
| 2334 | |
| 2335 | note_cmpxchg_failure("slab_free", s, tid); |
| 2336 | goto redo; |
| 2337 | } |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2338 | stat(s, FREE_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2339 | } else |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2340 | __slab_free(s, page, x, addr); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2341 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2342 | } |
| 2343 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2344 | void kmem_cache_free(struct kmem_cache *s, void *x) |
| 2345 | { |
Christoph Lameter | 77c5e2d | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 2346 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2347 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 2348 | page = virt_to_head_page(x); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2349 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2350 | slab_free(s, page, x, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2351 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2352 | trace_kmem_cache_free(_RET_IP_, x); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2353 | } |
| 2354 | EXPORT_SYMBOL(kmem_cache_free); |
| 2355 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2356 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2357 | * Object placement in a slab is made very easy because we always start at |
| 2358 | * offset 0. If we tune the size of the object to the alignment then we can |
| 2359 | * get the required alignment by putting one properly sized object after |
| 2360 | * another. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2361 | * |
| 2362 | * Notice that the allocation order determines the sizes of the per cpu |
| 2363 | * caches. Each processor has always one slab available for allocations. |
| 2364 | * Increasing the allocation order reduces the number of times that slabs |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2365 | * 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] | 2366 | * locking overhead. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2367 | */ |
| 2368 | |
| 2369 | /* |
| 2370 | * Mininum / Maximum order of slab pages. This influences locking overhead |
| 2371 | * and slab fragmentation. A higher order reduces the number of partial slabs |
| 2372 | * and increases the number of allocations possible without having to |
| 2373 | * take the list_lock. |
| 2374 | */ |
| 2375 | static int slub_min_order; |
Christoph Lameter | 114e9e8 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2376 | static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2377 | static int slub_min_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2378 | |
| 2379 | /* |
| 2380 | * 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] | 2381 | * (Could be removed. This was introduced to pacify the merge skeptics.) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2382 | */ |
| 2383 | static int slub_nomerge; |
| 2384 | |
| 2385 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2386 | * Calculate the order of allocation given an slab object size. |
| 2387 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2388 | * The order of allocation has significant impact on performance and other |
| 2389 | * system components. Generally order 0 allocations should be preferred since |
| 2390 | * order 0 does not cause fragmentation in the page allocator. Larger objects |
| 2391 | * 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] | 2392 | * 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] | 2393 | * would be wasted. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2394 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2395 | * In order to reach satisfactory performance we must ensure that a minimum |
| 2396 | * number of objects is in one slab. Otherwise we may generate too much |
| 2397 | * activity on the partial lists which requires taking the list_lock. This is |
| 2398 | * less a concern for large slabs though which are rarely used. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2399 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2400 | * slub_max_order specifies the order where we begin to stop considering the |
| 2401 | * number of objects in a slab as critical. If we reach slub_max_order then |
| 2402 | * we try to keep the page order as low as possible. So we accept more waste |
| 2403 | * of space in favor of a small page order. |
| 2404 | * |
| 2405 | * Higher order allocations also allow the placement of more objects in a |
| 2406 | * slab and thereby reduce object handling overhead. If the user has |
| 2407 | * requested a higher mininum order then we start with that one instead of |
| 2408 | * the smallest order which will fit the object. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2409 | */ |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2410 | static inline int slab_order(int size, int min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2411 | int max_order, int fract_leftover, int reserved) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2412 | { |
| 2413 | int order; |
| 2414 | int rem; |
Christoph Lameter | 6300ea7 | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 2415 | int min_order = slub_min_order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2416 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2417 | if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE) |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 2418 | return get_order(size * MAX_OBJS_PER_PAGE) - 1; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 2419 | |
Christoph Lameter | 6300ea7 | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 2420 | for (order = max(min_order, |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2421 | fls(min_objects * size - 1) - PAGE_SHIFT); |
| 2422 | order <= max_order; order++) { |
| 2423 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2424 | unsigned long slab_size = PAGE_SIZE << order; |
| 2425 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2426 | if (slab_size < min_objects * size + reserved) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2427 | continue; |
| 2428 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2429 | rem = (slab_size - reserved) % size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2430 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2431 | if (rem <= slab_size / fract_leftover) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2432 | break; |
| 2433 | |
| 2434 | } |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2435 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2436 | return order; |
| 2437 | } |
| 2438 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2439 | static inline int calculate_order(int size, int reserved) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2440 | { |
| 2441 | int order; |
| 2442 | int min_objects; |
| 2443 | int fraction; |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 2444 | int max_objects; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2445 | |
| 2446 | /* |
| 2447 | * Attempt to find best configuration for a slab. This |
| 2448 | * works by first attempting to generate a layout with |
| 2449 | * the best configuration and backing off gradually. |
| 2450 | * |
| 2451 | * First we reduce the acceptable waste in a slab. Then |
| 2452 | * we reduce the minimum objects required in a slab. |
| 2453 | */ |
| 2454 | min_objects = slub_min_objects; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2455 | if (!min_objects) |
| 2456 | min_objects = 4 * (fls(nr_cpu_ids) + 1); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2457 | max_objects = order_objects(slub_max_order, size, reserved); |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 2458 | min_objects = min(min_objects, max_objects); |
| 2459 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2460 | while (min_objects > 1) { |
Christoph Lameter | c124f5b | 2008-04-14 19:13:29 +0300 | [diff] [blame] | 2461 | fraction = 16; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2462 | while (fraction >= 4) { |
| 2463 | order = slab_order(size, min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2464 | slub_max_order, fraction, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2465 | if (order <= slub_max_order) |
| 2466 | return order; |
| 2467 | fraction /= 2; |
| 2468 | } |
Amerigo Wang | 5086c38 | 2009-08-19 21:44:13 +0300 | [diff] [blame] | 2469 | min_objects--; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2470 | } |
| 2471 | |
| 2472 | /* |
| 2473 | * We were unable to place multiple objects in a slab. Now |
| 2474 | * lets see if we can place a single object there. |
| 2475 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2476 | order = slab_order(size, 1, slub_max_order, 1, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2477 | if (order <= slub_max_order) |
| 2478 | return order; |
| 2479 | |
| 2480 | /* |
| 2481 | * Doh this slab cannot be placed using slub_max_order. |
| 2482 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2483 | order = slab_order(size, 1, MAX_ORDER, 1, reserved); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 2484 | if (order < MAX_ORDER) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2485 | return order; |
| 2486 | return -ENOSYS; |
| 2487 | } |
| 2488 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2489 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2490 | * Figure out what the alignment of the objects will be. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2491 | */ |
| 2492 | static unsigned long calculate_alignment(unsigned long flags, |
| 2493 | unsigned long align, unsigned long size) |
| 2494 | { |
| 2495 | /* |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2496 | * If the user wants hardware cache aligned objects then follow that |
| 2497 | * suggestion if the object is sufficiently large. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2498 | * |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2499 | * The hardware cache alignment cannot override the specified |
| 2500 | * alignment though. If that is greater then use it. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2501 | */ |
Nick Piggin | b621038 | 2008-03-05 14:05:56 -0800 | [diff] [blame] | 2502 | if (flags & SLAB_HWCACHE_ALIGN) { |
| 2503 | unsigned long ralign = cache_line_size(); |
| 2504 | while (size <= ralign / 2) |
| 2505 | ralign /= 2; |
| 2506 | align = max(align, ralign); |
| 2507 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2508 | |
| 2509 | if (align < ARCH_SLAB_MINALIGN) |
Nick Piggin | b621038 | 2008-03-05 14:05:56 -0800 | [diff] [blame] | 2510 | align = ARCH_SLAB_MINALIGN; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2511 | |
| 2512 | return ALIGN(align, sizeof(void *)); |
| 2513 | } |
| 2514 | |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 2515 | static void |
| 2516 | init_kmem_cache_node(struct kmem_cache_node *n, struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2517 | { |
| 2518 | n->nr_partial = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2519 | spin_lock_init(&n->list_lock); |
| 2520 | INIT_LIST_HEAD(&n->partial); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2521 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 2522 | atomic_long_set(&n->nr_slabs, 0); |
Salman Qazi | 02b71b7 | 2008-09-11 12:25:41 -0700 | [diff] [blame] | 2523 | atomic_long_set(&n->total_objects, 0); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 2524 | INIT_LIST_HEAD(&n->full); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2525 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2526 | } |
| 2527 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2528 | static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2529 | { |
Christoph Lameter | 6c182dc | 2010-08-20 12:37:14 -0500 | [diff] [blame] | 2530 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < |
| 2531 | SLUB_PAGE_SHIFT * sizeof(struct kmem_cache_cpu)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2532 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2533 | /* |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 2534 | * Must align to double word boundary for the double cmpxchg |
| 2535 | * instructions to work; see __pcpu_double_call_return_bool(). |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2536 | */ |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 2537 | s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), |
| 2538 | 2 * sizeof(void *)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2539 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2540 | if (!s->cpu_slab) |
| 2541 | return 0; |
| 2542 | |
| 2543 | init_kmem_cache_cpus(s); |
| 2544 | |
| 2545 | return 1; |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2546 | } |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2547 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2548 | static struct kmem_cache *kmem_cache_node; |
| 2549 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2550 | /* |
| 2551 | * No kmalloc_node yet so do it by hand. We know that this is the first |
| 2552 | * slab on the node for this slabcache. There are no concurrent accesses |
| 2553 | * possible. |
| 2554 | * |
| 2555 | * Note that this function only works on the kmalloc_node_cache |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2556 | * when allocating for the kmalloc_node_cache. This is used for bootstrapping |
| 2557 | * memory on a fresh node that has no slab structures yet. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2558 | */ |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2559 | static void early_kmem_cache_node_alloc(int node) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2560 | { |
| 2561 | struct page *page; |
| 2562 | struct kmem_cache_node *n; |
| 2563 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2564 | BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2565 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2566 | page = new_slab(kmem_cache_node, GFP_NOWAIT, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2567 | |
| 2568 | BUG_ON(!page); |
Christoph Lameter | a2f92ee | 2007-08-22 14:01:57 -0700 | [diff] [blame] | 2569 | if (page_to_nid(page) != node) { |
| 2570 | printk(KERN_ERR "SLUB: Unable to allocate memory from " |
| 2571 | "node %d\n", node); |
| 2572 | printk(KERN_ERR "SLUB: Allocating a useless per node structure " |
| 2573 | "in order to be able to continue\n"); |
| 2574 | } |
| 2575 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2576 | n = page->freelist; |
| 2577 | BUG_ON(!n); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2578 | page->freelist = get_freepointer(kmem_cache_node, n); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2579 | page->inuse++; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 2580 | page->frozen = 0; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2581 | kmem_cache_node->node[node] = n; |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2582 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 2583 | init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2584 | init_tracking(kmem_cache_node, n); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2585 | #endif |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2586 | init_kmem_cache_node(n, kmem_cache_node); |
| 2587 | inc_slabs_node(kmem_cache_node, node, page->objects); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2588 | |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2589 | add_partial(n, page, 0); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2590 | } |
| 2591 | |
| 2592 | static void free_kmem_cache_nodes(struct kmem_cache *s) |
| 2593 | { |
| 2594 | int node; |
| 2595 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 2596 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2597 | struct kmem_cache_node *n = s->node[node]; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2598 | |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2599 | if (n) |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2600 | kmem_cache_free(kmem_cache_node, n); |
| 2601 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2602 | s->node[node] = NULL; |
| 2603 | } |
| 2604 | } |
| 2605 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2606 | static int init_kmem_cache_nodes(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2607 | { |
| 2608 | int node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2609 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 2610 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2611 | struct kmem_cache_node *n; |
| 2612 | |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2613 | if (slab_state == DOWN) { |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2614 | early_kmem_cache_node_alloc(node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2615 | continue; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2616 | } |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2617 | n = kmem_cache_alloc_node(kmem_cache_node, |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2618 | GFP_KERNEL, node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2619 | |
| 2620 | if (!n) { |
| 2621 | free_kmem_cache_nodes(s); |
| 2622 | return 0; |
| 2623 | } |
| 2624 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2625 | s->node[node] = n; |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 2626 | init_kmem_cache_node(n, s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2627 | } |
| 2628 | return 1; |
| 2629 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2630 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 2631 | static void set_min_partial(struct kmem_cache *s, unsigned long min) |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 2632 | { |
| 2633 | if (min < MIN_PARTIAL) |
| 2634 | min = MIN_PARTIAL; |
| 2635 | else if (min > MAX_PARTIAL) |
| 2636 | min = MAX_PARTIAL; |
| 2637 | s->min_partial = min; |
| 2638 | } |
| 2639 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2640 | /* |
| 2641 | * calculate_sizes() determines the order and the distribution of data within |
| 2642 | * a slab object. |
| 2643 | */ |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2644 | static int calculate_sizes(struct kmem_cache *s, int forced_order) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2645 | { |
| 2646 | unsigned long flags = s->flags; |
| 2647 | unsigned long size = s->objsize; |
| 2648 | unsigned long align = s->align; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2649 | int order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2650 | |
| 2651 | /* |
Christoph Lameter | d8b42bf | 2008-02-15 23:45:25 -0800 | [diff] [blame] | 2652 | * Round up object size to the next word boundary. We can only |
| 2653 | * place the free pointer at word boundaries and this determines |
| 2654 | * the possible location of the free pointer. |
| 2655 | */ |
| 2656 | size = ALIGN(size, sizeof(void *)); |
| 2657 | |
| 2658 | #ifdef CONFIG_SLUB_DEBUG |
| 2659 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2660 | * Determine if we can poison the object itself. If the user of |
| 2661 | * the slab may touch the object after free or before allocation |
| 2662 | * then we should never poison the object itself. |
| 2663 | */ |
| 2664 | if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) && |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 2665 | !s->ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2666 | s->flags |= __OBJECT_POISON; |
| 2667 | else |
| 2668 | s->flags &= ~__OBJECT_POISON; |
| 2669 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2670 | |
| 2671 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2672 | * 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] | 2673 | * 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] | 2674 | * additional word to have some bytes to store Redzone information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2675 | */ |
| 2676 | if ((flags & SLAB_RED_ZONE) && size == s->objsize) |
| 2677 | size += sizeof(void *); |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 2678 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2679 | |
| 2680 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2681 | * With that we have determined the number of bytes in actual use |
| 2682 | * by the object. This is the potential offset to the free pointer. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2683 | */ |
| 2684 | s->inuse = size; |
| 2685 | |
| 2686 | if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) || |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 2687 | s->ctor)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2688 | /* |
| 2689 | * Relocate free pointer after the object if it is not |
| 2690 | * permitted to overwrite the first word of the object on |
| 2691 | * kmem_cache_free. |
| 2692 | * |
| 2693 | * This is the case if we do RCU, have a constructor or |
| 2694 | * destructor or are poisoning the objects. |
| 2695 | */ |
| 2696 | s->offset = size; |
| 2697 | size += sizeof(void *); |
| 2698 | } |
| 2699 | |
Christoph Lameter | c12b3c6 | 2007-05-23 13:57:31 -0700 | [diff] [blame] | 2700 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2701 | if (flags & SLAB_STORE_USER) |
| 2702 | /* |
| 2703 | * Need to store information about allocs and frees after |
| 2704 | * the object. |
| 2705 | */ |
| 2706 | size += 2 * sizeof(struct track); |
| 2707 | |
Christoph Lameter | be7b3fb | 2007-05-09 02:32:36 -0700 | [diff] [blame] | 2708 | if (flags & SLAB_RED_ZONE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2709 | /* |
| 2710 | * Add some empty padding so that we can catch |
| 2711 | * overwrites from earlier objects rather than let |
| 2712 | * tracking information or the free pointer be |
Frederik Schwarzer | 0211a9c | 2008-12-29 22:14:56 +0100 | [diff] [blame] | 2713 | * corrupted if a user writes before the start |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2714 | * of the object. |
| 2715 | */ |
| 2716 | size += sizeof(void *); |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 2717 | #endif |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2718 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2719 | /* |
| 2720 | * Determine the alignment based on various parameters that the |
Christoph Lameter | 65c02d4 | 2007-05-09 02:32:35 -0700 | [diff] [blame] | 2721 | * user specified and the dynamic determination of cache line size |
| 2722 | * on bootup. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2723 | */ |
| 2724 | align = calculate_alignment(flags, align, s->objsize); |
Zhang, Yanmin | dcb0ce1 | 2009-07-30 11:28:11 +0800 | [diff] [blame] | 2725 | s->align = align; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2726 | |
| 2727 | /* |
| 2728 | * SLUB stores one object immediately after another beginning from |
| 2729 | * offset 0. In order to align the objects we have to simply size |
| 2730 | * each object to conform to the alignment. |
| 2731 | */ |
| 2732 | size = ALIGN(size, align); |
| 2733 | s->size = size; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2734 | if (forced_order >= 0) |
| 2735 | order = forced_order; |
| 2736 | else |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2737 | order = calculate_order(size, s->reserved); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2738 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2739 | if (order < 0) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2740 | return 0; |
| 2741 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 2742 | s->allocflags = 0; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2743 | if (order) |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 2744 | s->allocflags |= __GFP_COMP; |
| 2745 | |
| 2746 | if (s->flags & SLAB_CACHE_DMA) |
| 2747 | s->allocflags |= SLUB_DMA; |
| 2748 | |
| 2749 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 2750 | s->allocflags |= __GFP_RECLAIMABLE; |
| 2751 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2752 | /* |
| 2753 | * Determine the number of objects per slab |
| 2754 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2755 | s->oo = oo_make(order, size, s->reserved); |
| 2756 | s->min = oo_make(get_order(size), size, s->reserved); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 2757 | if (oo_objects(s->oo) > oo_objects(s->max)) |
| 2758 | s->max = s->oo; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2759 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2760 | return !!oo_objects(s->oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2761 | |
| 2762 | } |
| 2763 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2764 | static int kmem_cache_open(struct kmem_cache *s, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2765 | const char *name, size_t size, |
| 2766 | size_t align, unsigned long flags, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 2767 | void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2768 | { |
| 2769 | memset(s, 0, kmem_size); |
| 2770 | s->name = name; |
| 2771 | s->ctor = ctor; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2772 | s->objsize = size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2773 | s->align = align; |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 2774 | s->flags = kmem_cache_flags(size, flags, name, ctor); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2775 | s->reserved = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2776 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 2777 | if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU)) |
| 2778 | s->reserved = sizeof(struct rcu_head); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2779 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2780 | if (!calculate_sizes(s, -1)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2781 | goto error; |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 2782 | if (disable_higher_order_debug) { |
| 2783 | /* |
| 2784 | * Disable debugging flags that store metadata if the min slab |
| 2785 | * order increased. |
| 2786 | */ |
| 2787 | if (get_order(s->size) > get_order(s->objsize)) { |
| 2788 | s->flags &= ~DEBUG_METADATA_FLAGS; |
| 2789 | s->offset = 0; |
| 2790 | if (!calculate_sizes(s, -1)) |
| 2791 | goto error; |
| 2792 | } |
| 2793 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2794 | |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 2795 | #ifdef CONFIG_CMPXCHG_DOUBLE |
| 2796 | if (system_has_cmpxchg_double() && (s->flags & SLAB_DEBUG_FLAGS) == 0) |
| 2797 | /* Enable fast mode */ |
| 2798 | s->flags |= __CMPXCHG_DOUBLE; |
| 2799 | #endif |
| 2800 | |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 2801 | /* |
| 2802 | * The larger the object size is, the more pages we want on the partial |
| 2803 | * list to avoid pounding the page allocator excessively. |
| 2804 | */ |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 2805 | set_min_partial(s, ilog2(s->size)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2806 | s->refcount = 1; |
| 2807 | #ifdef CONFIG_NUMA |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 2808 | s->remote_node_defrag_ratio = 1000; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2809 | #endif |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2810 | if (!init_kmem_cache_nodes(s)) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2811 | goto error; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2812 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2813 | if (alloc_kmem_cache_cpus(s)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2814 | return 1; |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2815 | |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2816 | free_kmem_cache_nodes(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2817 | error: |
| 2818 | if (flags & SLAB_PANIC) |
| 2819 | panic("Cannot create slab %s size=%lu realsize=%u " |
| 2820 | "order=%u offset=%u flags=%lx\n", |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2821 | s->name, (unsigned long)size, s->size, oo_order(s->oo), |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2822 | s->offset, flags); |
| 2823 | return 0; |
| 2824 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2825 | |
| 2826 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2827 | * Determine the size of a slab object |
| 2828 | */ |
| 2829 | unsigned int kmem_cache_size(struct kmem_cache *s) |
| 2830 | { |
| 2831 | return s->objsize; |
| 2832 | } |
| 2833 | EXPORT_SYMBOL(kmem_cache_size); |
| 2834 | |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2835 | static void list_slab_objects(struct kmem_cache *s, struct page *page, |
| 2836 | const char *text) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2837 | { |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2838 | #ifdef CONFIG_SLUB_DEBUG |
| 2839 | void *addr = page_address(page); |
| 2840 | void *p; |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 2841 | unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) * |
| 2842 | sizeof(long), GFP_ATOMIC); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 2843 | if (!map) |
| 2844 | return; |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2845 | slab_err(s, page, "%s", text); |
| 2846 | slab_lock(page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2847 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 2848 | get_map(s, page, map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2849 | for_each_object(p, s, addr, page->objects) { |
| 2850 | |
| 2851 | if (!test_bit(slab_index(p, s, addr), map)) { |
| 2852 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu\n", |
| 2853 | p, p - addr); |
| 2854 | print_tracking(s, p); |
| 2855 | } |
| 2856 | } |
| 2857 | slab_unlock(page); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 2858 | kfree(map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2859 | #endif |
| 2860 | } |
| 2861 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2862 | /* |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2863 | * Attempt to free all partial slabs on a node. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2864 | */ |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2865 | 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] | 2866 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2867 | unsigned long flags; |
| 2868 | struct page *page, *h; |
| 2869 | |
| 2870 | spin_lock_irqsave(&n->list_lock, flags); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2871 | list_for_each_entry_safe(page, h, &n->partial, lru) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2872 | if (!page->inuse) { |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2873 | remove_partial(n, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2874 | discard_slab(s, page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2875 | } else { |
| 2876 | list_slab_objects(s, page, |
| 2877 | "Objects remaining on kmem_cache_close()"); |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2878 | } |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2879 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2880 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2881 | } |
| 2882 | |
| 2883 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2884 | * Release all resources used by a slab cache. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2885 | */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 2886 | static inline int kmem_cache_close(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2887 | { |
| 2888 | int node; |
| 2889 | |
| 2890 | flush_all(s); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2891 | free_percpu(s->cpu_slab); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2892 | /* Attempt to free all objects */ |
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 = get_node(s, node); |
| 2895 | |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2896 | free_partial(s, n); |
| 2897 | if (n->nr_partial || slabs_node(s, node)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2898 | return 1; |
| 2899 | } |
| 2900 | free_kmem_cache_nodes(s); |
| 2901 | return 0; |
| 2902 | } |
| 2903 | |
| 2904 | /* |
| 2905 | * Close a cache and release the kmem_cache structure |
| 2906 | * (must be used for caches created using kmem_cache_create) |
| 2907 | */ |
| 2908 | void kmem_cache_destroy(struct kmem_cache *s) |
| 2909 | { |
| 2910 | down_write(&slub_lock); |
| 2911 | s->refcount--; |
| 2912 | if (!s->refcount) { |
| 2913 | list_del(&s->list); |
Pekka Enberg | d629d81 | 2008-04-23 22:31:08 +0300 | [diff] [blame] | 2914 | if (kmem_cache_close(s)) { |
| 2915 | printk(KERN_ERR "SLUB %s: %s called for cache that " |
| 2916 | "still has objects.\n", s->name, __func__); |
| 2917 | dump_stack(); |
| 2918 | } |
Eric Dumazet | d76b159 | 2009-09-03 22:38:59 +0300 | [diff] [blame] | 2919 | if (s->flags & SLAB_DESTROY_BY_RCU) |
| 2920 | rcu_barrier(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2921 | sysfs_slab_remove(s); |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 2922 | } |
| 2923 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2924 | } |
| 2925 | EXPORT_SYMBOL(kmem_cache_destroy); |
| 2926 | |
| 2927 | /******************************************************************** |
| 2928 | * Kmalloc subsystem |
| 2929 | *******************************************************************/ |
| 2930 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2931 | struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2932 | EXPORT_SYMBOL(kmalloc_caches); |
| 2933 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2934 | static struct kmem_cache *kmem_cache; |
| 2935 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2936 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2937 | static struct kmem_cache *kmalloc_dma_caches[SLUB_PAGE_SHIFT]; |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2938 | #endif |
| 2939 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2940 | static int __init setup_slub_min_order(char *str) |
| 2941 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2942 | get_option(&str, &slub_min_order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2943 | |
| 2944 | return 1; |
| 2945 | } |
| 2946 | |
| 2947 | __setup("slub_min_order=", setup_slub_min_order); |
| 2948 | |
| 2949 | static int __init setup_slub_max_order(char *str) |
| 2950 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2951 | get_option(&str, &slub_max_order); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 2952 | slub_max_order = min(slub_max_order, MAX_ORDER - 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2953 | |
| 2954 | return 1; |
| 2955 | } |
| 2956 | |
| 2957 | __setup("slub_max_order=", setup_slub_max_order); |
| 2958 | |
| 2959 | static int __init setup_slub_min_objects(char *str) |
| 2960 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2961 | get_option(&str, &slub_min_objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2962 | |
| 2963 | return 1; |
| 2964 | } |
| 2965 | |
| 2966 | __setup("slub_min_objects=", setup_slub_min_objects); |
| 2967 | |
| 2968 | static int __init setup_slub_nomerge(char *str) |
| 2969 | { |
| 2970 | slub_nomerge = 1; |
| 2971 | return 1; |
| 2972 | } |
| 2973 | |
| 2974 | __setup("slub_nomerge", setup_slub_nomerge); |
| 2975 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2976 | static struct kmem_cache *__init create_kmalloc_cache(const char *name, |
| 2977 | int size, unsigned int flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2978 | { |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2979 | struct kmem_cache *s; |
| 2980 | |
| 2981 | s = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); |
| 2982 | |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 2983 | /* |
| 2984 | * This function is called with IRQs disabled during early-boot on |
| 2985 | * single CPU so there's no need to take slub_lock here. |
| 2986 | */ |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2987 | if (!kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN, |
Christoph Lameter | 319d1e2 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2988 | flags, NULL)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2989 | goto panic; |
| 2990 | |
| 2991 | list_add(&s->list, &slab_caches); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2992 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2993 | |
| 2994 | panic: |
| 2995 | panic("Creation of kmalloc slab %s size=%d failed.\n", name, size); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2996 | return NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2997 | } |
| 2998 | |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 2999 | /* |
| 3000 | * Conversion table for small slabs sizes / 8 to the index in the |
| 3001 | * kmalloc array. This is necessary for slabs < 192 since we have non power |
| 3002 | * of two cache sizes there. The size of larger slabs can be determined using |
| 3003 | * fls. |
| 3004 | */ |
| 3005 | static s8 size_index[24] = { |
| 3006 | 3, /* 8 */ |
| 3007 | 4, /* 16 */ |
| 3008 | 5, /* 24 */ |
| 3009 | 5, /* 32 */ |
| 3010 | 6, /* 40 */ |
| 3011 | 6, /* 48 */ |
| 3012 | 6, /* 56 */ |
| 3013 | 6, /* 64 */ |
| 3014 | 1, /* 72 */ |
| 3015 | 1, /* 80 */ |
| 3016 | 1, /* 88 */ |
| 3017 | 1, /* 96 */ |
| 3018 | 7, /* 104 */ |
| 3019 | 7, /* 112 */ |
| 3020 | 7, /* 120 */ |
| 3021 | 7, /* 128 */ |
| 3022 | 2, /* 136 */ |
| 3023 | 2, /* 144 */ |
| 3024 | 2, /* 152 */ |
| 3025 | 2, /* 160 */ |
| 3026 | 2, /* 168 */ |
| 3027 | 2, /* 176 */ |
| 3028 | 2, /* 184 */ |
| 3029 | 2 /* 192 */ |
| 3030 | }; |
| 3031 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3032 | static inline int size_index_elem(size_t bytes) |
| 3033 | { |
| 3034 | return (bytes - 1) / 8; |
| 3035 | } |
| 3036 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3037 | static struct kmem_cache *get_slab(size_t size, gfp_t flags) |
| 3038 | { |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3039 | int index; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3040 | |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3041 | if (size <= 192) { |
| 3042 | if (!size) |
| 3043 | return ZERO_SIZE_PTR; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3044 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3045 | index = size_index[size_index_elem(size)]; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3046 | } else |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3047 | index = fls(size - 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3048 | |
| 3049 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3050 | if (unlikely((flags & SLUB_DMA))) |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3051 | return kmalloc_dma_caches[index]; |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3052 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3053 | #endif |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3054 | return kmalloc_caches[index]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3055 | } |
| 3056 | |
| 3057 | void *__kmalloc(size_t size, gfp_t flags) |
| 3058 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3059 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3060 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3061 | |
Christoph Lameter | ffadd4d | 2009-02-17 12:05:07 -0500 | [diff] [blame] | 3062 | if (unlikely(size > SLUB_MAX_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3063 | return kmalloc_large(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3064 | |
| 3065 | s = get_slab(size, flags); |
| 3066 | |
| 3067 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3068 | return s; |
| 3069 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 3070 | ret = slab_alloc(s, flags, NUMA_NO_NODE, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3071 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3072 | trace_kmalloc(_RET_IP_, ret, size, s->size, flags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3073 | |
| 3074 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3075 | } |
| 3076 | EXPORT_SYMBOL(__kmalloc); |
| 3077 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3078 | #ifdef CONFIG_NUMA |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3079 | static void *kmalloc_large_node(size_t size, gfp_t flags, int node) |
| 3080 | { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 3081 | struct page *page; |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3082 | void *ptr = NULL; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3083 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 3084 | flags |= __GFP_COMP | __GFP_NOTRACK; |
| 3085 | page = alloc_pages_node(node, flags, get_order(size)); |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3086 | if (page) |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3087 | ptr = page_address(page); |
| 3088 | |
| 3089 | kmemleak_alloc(ptr, size, 1, flags); |
| 3090 | return ptr; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3091 | } |
| 3092 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3093 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| 3094 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3095 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3096 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3097 | |
Ingo Molnar | 057685c | 2009-02-20 12:15:30 +0100 | [diff] [blame] | 3098 | if (unlikely(size > SLUB_MAX_SIZE)) { |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3099 | ret = kmalloc_large_node(size, flags, node); |
| 3100 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3101 | trace_kmalloc_node(_RET_IP_, ret, |
| 3102 | size, PAGE_SIZE << get_order(size), |
| 3103 | flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3104 | |
| 3105 | return ret; |
| 3106 | } |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3107 | |
| 3108 | s = get_slab(size, flags); |
| 3109 | |
| 3110 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3111 | return s; |
| 3112 | |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3113 | ret = slab_alloc(s, flags, node, _RET_IP_); |
| 3114 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3115 | trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3116 | |
| 3117 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3118 | } |
| 3119 | EXPORT_SYMBOL(__kmalloc_node); |
| 3120 | #endif |
| 3121 | |
| 3122 | size_t ksize(const void *object) |
| 3123 | { |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3124 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3125 | |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 3126 | if (unlikely(object == ZERO_SIZE_PTR)) |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3127 | return 0; |
| 3128 | |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3129 | page = virt_to_head_page(object); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3130 | |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3131 | if (unlikely(!PageSlab(page))) { |
| 3132 | WARN_ON(!PageCompound(page)); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3133 | return PAGE_SIZE << compound_order(page); |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3134 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3135 | |
Eric Dumazet | b3d4188 | 2011-02-14 18:35:22 +0100 | [diff] [blame] | 3136 | return slab_ksize(page->slab); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3137 | } |
Kirill A. Shutemov | b1aabec | 2009-02-10 15:21:44 +0200 | [diff] [blame] | 3138 | EXPORT_SYMBOL(ksize); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3139 | |
| 3140 | void kfree(const void *x) |
| 3141 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3142 | struct page *page; |
Christoph Lameter | 5bb983b | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 3143 | void *object = (void *)x; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3144 | |
Pekka Enberg | 2121db7 | 2009-03-25 11:05:57 +0200 | [diff] [blame] | 3145 | trace_kfree(_RET_IP_, x); |
| 3146 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3147 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3148 | return; |
| 3149 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 3150 | page = virt_to_head_page(x); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3151 | if (unlikely(!PageSlab(page))) { |
Christoph Lameter | 0937502 | 2008-05-28 10:32:22 -0700 | [diff] [blame] | 3152 | BUG_ON(!PageCompound(page)); |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3153 | kmemleak_free(x); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3154 | put_page(page); |
| 3155 | return; |
| 3156 | } |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3157 | slab_free(page->slab, page, object, _RET_IP_); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3158 | } |
| 3159 | EXPORT_SYMBOL(kfree); |
| 3160 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3161 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3162 | * kmem_cache_shrink removes empty slabs from the partial lists and sorts |
| 3163 | * the remaining slabs by the number of items in use. The slabs with the |
| 3164 | * most items in use come first. New allocations will then fill those up |
| 3165 | * and thus they can be removed from the partial lists. |
| 3166 | * |
| 3167 | * The slabs with the least items are placed last. This results in them |
| 3168 | * being allocated from last increasing the chance that the last objects |
| 3169 | * are freed in them. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3170 | */ |
| 3171 | int kmem_cache_shrink(struct kmem_cache *s) |
| 3172 | { |
| 3173 | int node; |
| 3174 | int i; |
| 3175 | struct kmem_cache_node *n; |
| 3176 | struct page *page; |
| 3177 | struct page *t; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3178 | int objects = oo_objects(s->max); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3179 | struct list_head *slabs_by_inuse = |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3180 | kmalloc(sizeof(struct list_head) * objects, GFP_KERNEL); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3181 | unsigned long flags; |
| 3182 | |
| 3183 | if (!slabs_by_inuse) |
| 3184 | return -ENOMEM; |
| 3185 | |
| 3186 | flush_all(s); |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3187 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3188 | n = get_node(s, node); |
| 3189 | |
| 3190 | if (!n->nr_partial) |
| 3191 | continue; |
| 3192 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3193 | for (i = 0; i < objects; i++) |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3194 | INIT_LIST_HEAD(slabs_by_inuse + i); |
| 3195 | |
| 3196 | spin_lock_irqsave(&n->list_lock, flags); |
| 3197 | |
| 3198 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3199 | * Build lists indexed by the items in use in each slab. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3200 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3201 | * Note that concurrent frees may occur while we hold the |
| 3202 | * list_lock. page->inuse here is the upper limit. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3203 | */ |
| 3204 | list_for_each_entry_safe(page, t, &n->partial, lru) { |
| 3205 | if (!page->inuse && slab_trylock(page)) { |
| 3206 | /* |
| 3207 | * Must hold slab lock here because slab_free |
| 3208 | * may have freed the last object and be |
| 3209 | * waiting to release the slab. |
| 3210 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 3211 | remove_partial(n, page); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3212 | slab_unlock(page); |
| 3213 | discard_slab(s, page); |
| 3214 | } else { |
Christoph Lameter | fcda3d8 | 2007-07-30 13:06:46 -0700 | [diff] [blame] | 3215 | list_move(&page->lru, |
| 3216 | slabs_by_inuse + page->inuse); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3217 | } |
| 3218 | } |
| 3219 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3220 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3221 | * Rebuild the partial list with the slabs filled up most |
| 3222 | * first and the least used slabs at the end. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3223 | */ |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3224 | for (i = objects - 1; i >= 0; i--) |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3225 | list_splice(slabs_by_inuse + i, n->partial.prev); |
| 3226 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3227 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 3228 | } |
| 3229 | |
| 3230 | kfree(slabs_by_inuse); |
| 3231 | return 0; |
| 3232 | } |
| 3233 | EXPORT_SYMBOL(kmem_cache_shrink); |
| 3234 | |
Pekka Enberg | 92a5bbc | 2010-10-06 16:58:16 +0300 | [diff] [blame] | 3235 | #if defined(CONFIG_MEMORY_HOTPLUG) |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3236 | static int slab_mem_going_offline_callback(void *arg) |
| 3237 | { |
| 3238 | struct kmem_cache *s; |
| 3239 | |
| 3240 | down_read(&slub_lock); |
| 3241 | list_for_each_entry(s, &slab_caches, list) |
| 3242 | kmem_cache_shrink(s); |
| 3243 | up_read(&slub_lock); |
| 3244 | |
| 3245 | return 0; |
| 3246 | } |
| 3247 | |
| 3248 | static void slab_mem_offline_callback(void *arg) |
| 3249 | { |
| 3250 | struct kmem_cache_node *n; |
| 3251 | struct kmem_cache *s; |
| 3252 | struct memory_notify *marg = arg; |
| 3253 | int offline_node; |
| 3254 | |
| 3255 | offline_node = marg->status_change_nid; |
| 3256 | |
| 3257 | /* |
| 3258 | * If the node still has available memory. we need kmem_cache_node |
| 3259 | * for it yet. |
| 3260 | */ |
| 3261 | if (offline_node < 0) |
| 3262 | return; |
| 3263 | |
| 3264 | down_read(&slub_lock); |
| 3265 | list_for_each_entry(s, &slab_caches, list) { |
| 3266 | n = get_node(s, offline_node); |
| 3267 | if (n) { |
| 3268 | /* |
| 3269 | * if n->nr_slabs > 0, slabs still exist on the node |
| 3270 | * that is going down. We were unable to free them, |
Adam Buchbinder | c9404c9 | 2009-12-18 15:40:42 -0500 | [diff] [blame] | 3271 | * and offline_pages() function shouldn't call this |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3272 | * callback. So, we must fail. |
| 3273 | */ |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 3274 | BUG_ON(slabs_node(s, offline_node)); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3275 | |
| 3276 | s->node[offline_node] = NULL; |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3277 | kmem_cache_free(kmem_cache_node, n); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3278 | } |
| 3279 | } |
| 3280 | up_read(&slub_lock); |
| 3281 | } |
| 3282 | |
| 3283 | static int slab_mem_going_online_callback(void *arg) |
| 3284 | { |
| 3285 | struct kmem_cache_node *n; |
| 3286 | struct kmem_cache *s; |
| 3287 | struct memory_notify *marg = arg; |
| 3288 | int nid = marg->status_change_nid; |
| 3289 | int ret = 0; |
| 3290 | |
| 3291 | /* |
| 3292 | * If the node's memory is already available, then kmem_cache_node is |
| 3293 | * already created. Nothing to do. |
| 3294 | */ |
| 3295 | if (nid < 0) |
| 3296 | return 0; |
| 3297 | |
| 3298 | /* |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 3299 | * 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] | 3300 | * allocate a kmem_cache_node structure in order to bring the node |
| 3301 | * online. |
| 3302 | */ |
| 3303 | down_read(&slub_lock); |
| 3304 | list_for_each_entry(s, &slab_caches, list) { |
| 3305 | /* |
| 3306 | * XXX: kmem_cache_alloc_node will fallback to other nodes |
| 3307 | * since memory is not yet available from the node that |
| 3308 | * is brought up. |
| 3309 | */ |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3310 | n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3311 | if (!n) { |
| 3312 | ret = -ENOMEM; |
| 3313 | goto out; |
| 3314 | } |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 3315 | init_kmem_cache_node(n, s); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3316 | s->node[nid] = n; |
| 3317 | } |
| 3318 | out: |
| 3319 | up_read(&slub_lock); |
| 3320 | return ret; |
| 3321 | } |
| 3322 | |
| 3323 | static int slab_memory_callback(struct notifier_block *self, |
| 3324 | unsigned long action, void *arg) |
| 3325 | { |
| 3326 | int ret = 0; |
| 3327 | |
| 3328 | switch (action) { |
| 3329 | case MEM_GOING_ONLINE: |
| 3330 | ret = slab_mem_going_online_callback(arg); |
| 3331 | break; |
| 3332 | case MEM_GOING_OFFLINE: |
| 3333 | ret = slab_mem_going_offline_callback(arg); |
| 3334 | break; |
| 3335 | case MEM_OFFLINE: |
| 3336 | case MEM_CANCEL_ONLINE: |
| 3337 | slab_mem_offline_callback(arg); |
| 3338 | break; |
| 3339 | case MEM_ONLINE: |
| 3340 | case MEM_CANCEL_OFFLINE: |
| 3341 | break; |
| 3342 | } |
KAMEZAWA Hiroyuki | dc19f9d | 2008-12-01 13:13:48 -0800 | [diff] [blame] | 3343 | if (ret) |
| 3344 | ret = notifier_from_errno(ret); |
| 3345 | else |
| 3346 | ret = NOTIFY_OK; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3347 | return ret; |
| 3348 | } |
| 3349 | |
| 3350 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 3351 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3352 | /******************************************************************** |
| 3353 | * Basic setup of slabs |
| 3354 | *******************************************************************/ |
| 3355 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3356 | /* |
| 3357 | * Used for early kmem_cache structures that were allocated using |
| 3358 | * the page allocator |
| 3359 | */ |
| 3360 | |
| 3361 | static void __init kmem_cache_bootstrap_fixup(struct kmem_cache *s) |
| 3362 | { |
| 3363 | int node; |
| 3364 | |
| 3365 | list_add(&s->list, &slab_caches); |
| 3366 | s->refcount = -1; |
| 3367 | |
| 3368 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 3369 | struct kmem_cache_node *n = get_node(s, node); |
| 3370 | struct page *p; |
| 3371 | |
| 3372 | if (n) { |
| 3373 | list_for_each_entry(p, &n->partial, lru) |
| 3374 | p->slab = s; |
| 3375 | |
Li Zefan | 607bf32 | 2011-04-12 15:22:26 +0800 | [diff] [blame] | 3376 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3377 | list_for_each_entry(p, &n->full, lru) |
| 3378 | p->slab = s; |
| 3379 | #endif |
| 3380 | } |
| 3381 | } |
| 3382 | } |
| 3383 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3384 | void __init kmem_cache_init(void) |
| 3385 | { |
| 3386 | int i; |
Christoph Lameter | 4b356be | 2007-06-16 10:16:13 -0700 | [diff] [blame] | 3387 | int caches = 0; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3388 | struct kmem_cache *temp_kmem_cache; |
| 3389 | int order; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3390 | struct kmem_cache *temp_kmem_cache_node; |
| 3391 | unsigned long kmalloc_size; |
| 3392 | |
| 3393 | kmem_size = offsetof(struct kmem_cache, node) + |
| 3394 | nr_node_ids * sizeof(struct kmem_cache_node *); |
| 3395 | |
| 3396 | /* Allocate two kmem_caches from the page allocator */ |
| 3397 | kmalloc_size = ALIGN(kmem_size, cache_line_size()); |
| 3398 | order = get_order(2 * kmalloc_size); |
| 3399 | kmem_cache = (void *)__get_free_pages(GFP_NOWAIT, order); |
| 3400 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3401 | /* |
| 3402 | * Must first have the slab cache available for the allocations of the |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3403 | * struct kmem_cache_node's. There is special bootstrap code in |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3404 | * kmem_cache_open for slab_state == DOWN. |
| 3405 | */ |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3406 | kmem_cache_node = (void *)kmem_cache + kmalloc_size; |
| 3407 | |
| 3408 | kmem_cache_open(kmem_cache_node, "kmem_cache_node", |
| 3409 | sizeof(struct kmem_cache_node), |
| 3410 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3411 | |
Nadia Derbey | 0c40ba4 | 2008-04-29 01:00:41 -0700 | [diff] [blame] | 3412 | hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3413 | |
| 3414 | /* Able to allocate the per node structures */ |
| 3415 | slab_state = PARTIAL; |
| 3416 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3417 | temp_kmem_cache = kmem_cache; |
| 3418 | kmem_cache_open(kmem_cache, "kmem_cache", kmem_size, |
| 3419 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); |
| 3420 | kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); |
| 3421 | memcpy(kmem_cache, temp_kmem_cache, kmem_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3422 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3423 | /* |
| 3424 | * Allocate kmem_cache_node properly from the kmem_cache slab. |
| 3425 | * kmem_cache_node is separately allocated so no need to |
| 3426 | * update any list pointers. |
| 3427 | */ |
| 3428 | temp_kmem_cache_node = kmem_cache_node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3429 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3430 | kmem_cache_node = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); |
| 3431 | memcpy(kmem_cache_node, temp_kmem_cache_node, kmem_size); |
| 3432 | |
| 3433 | kmem_cache_bootstrap_fixup(kmem_cache_node); |
| 3434 | |
| 3435 | caches++; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3436 | kmem_cache_bootstrap_fixup(kmem_cache); |
| 3437 | caches++; |
| 3438 | /* Free temporary boot structure */ |
| 3439 | free_pages((unsigned long)temp_kmem_cache, order); |
| 3440 | |
| 3441 | /* Now we can use the kmem_cache to allocate kmalloc slabs */ |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3442 | |
| 3443 | /* |
| 3444 | * Patch up the size_index table if we have strange large alignment |
| 3445 | * requirements for the kmalloc array. This is only the case for |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3446 | * MIPS it seems. The standard arches will not generate any code here. |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3447 | * |
| 3448 | * Largest permitted alignment is 256 bytes due to the way we |
| 3449 | * handle the index determination for the smaller caches. |
| 3450 | * |
| 3451 | * Make sure that nothing crazy happens if someone starts tinkering |
| 3452 | * around with ARCH_KMALLOC_MINALIGN |
| 3453 | */ |
| 3454 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 256 || |
| 3455 | (KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1))); |
| 3456 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3457 | for (i = 8; i < KMALLOC_MIN_SIZE; i += 8) { |
| 3458 | int elem = size_index_elem(i); |
| 3459 | if (elem >= ARRAY_SIZE(size_index)) |
| 3460 | break; |
| 3461 | size_index[elem] = KMALLOC_SHIFT_LOW; |
| 3462 | } |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3463 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3464 | if (KMALLOC_MIN_SIZE == 64) { |
| 3465 | /* |
| 3466 | * The 96 byte size cache is not used if the alignment |
| 3467 | * is 64 byte. |
| 3468 | */ |
| 3469 | for (i = 64 + 8; i <= 96; i += 8) |
| 3470 | size_index[size_index_elem(i)] = 7; |
| 3471 | } else if (KMALLOC_MIN_SIZE == 128) { |
Christoph Lameter | 41d54d3 | 2008-07-03 09:14:26 -0500 | [diff] [blame] | 3472 | /* |
| 3473 | * The 192 byte sized cache is not used if the alignment |
| 3474 | * is 128 byte. Redirect kmalloc to use the 256 byte cache |
| 3475 | * instead. |
| 3476 | */ |
| 3477 | for (i = 128 + 8; i <= 192; i += 8) |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3478 | size_index[size_index_elem(i)] = 8; |
Christoph Lameter | 41d54d3 | 2008-07-03 09:14:26 -0500 | [diff] [blame] | 3479 | } |
| 3480 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3481 | /* Caches that are not of the two-to-the-power-of size */ |
| 3482 | if (KMALLOC_MIN_SIZE <= 32) { |
| 3483 | kmalloc_caches[1] = create_kmalloc_cache("kmalloc-96", 96, 0); |
| 3484 | caches++; |
| 3485 | } |
| 3486 | |
| 3487 | if (KMALLOC_MIN_SIZE <= 64) { |
| 3488 | kmalloc_caches[2] = create_kmalloc_cache("kmalloc-192", 192, 0); |
| 3489 | caches++; |
| 3490 | } |
| 3491 | |
| 3492 | for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) { |
| 3493 | kmalloc_caches[i] = create_kmalloc_cache("kmalloc", 1 << i, 0); |
| 3494 | caches++; |
| 3495 | } |
| 3496 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3497 | slab_state = UP; |
| 3498 | |
| 3499 | /* Provide the correct kmalloc names now that the caches are up */ |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3500 | if (KMALLOC_MIN_SIZE <= 32) { |
| 3501 | kmalloc_caches[1]->name = kstrdup(kmalloc_caches[1]->name, GFP_NOWAIT); |
| 3502 | BUG_ON(!kmalloc_caches[1]->name); |
| 3503 | } |
| 3504 | |
| 3505 | if (KMALLOC_MIN_SIZE <= 64) { |
| 3506 | kmalloc_caches[2]->name = kstrdup(kmalloc_caches[2]->name, GFP_NOWAIT); |
| 3507 | BUG_ON(!kmalloc_caches[2]->name); |
| 3508 | } |
| 3509 | |
Christoph Lameter | d7278bd | 2010-07-09 14:07:12 -0500 | [diff] [blame] | 3510 | for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) { |
| 3511 | char *s = kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i); |
| 3512 | |
| 3513 | BUG_ON(!s); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3514 | kmalloc_caches[i]->name = s; |
Christoph Lameter | d7278bd | 2010-07-09 14:07:12 -0500 | [diff] [blame] | 3515 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3516 | |
| 3517 | #ifdef CONFIG_SMP |
| 3518 | register_cpu_notifier(&slab_notifier); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 3519 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3520 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3521 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3522 | for (i = 0; i < SLUB_PAGE_SHIFT; i++) { |
| 3523 | struct kmem_cache *s = kmalloc_caches[i]; |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3524 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3525 | if (s && s->size) { |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3526 | char *name = kasprintf(GFP_NOWAIT, |
| 3527 | "dma-kmalloc-%d", s->objsize); |
| 3528 | |
| 3529 | BUG_ON(!name); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3530 | kmalloc_dma_caches[i] = create_kmalloc_cache(name, |
| 3531 | s->objsize, SLAB_CACHE_DMA); |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3532 | } |
| 3533 | } |
| 3534 | #endif |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 3535 | printk(KERN_INFO |
| 3536 | "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d," |
Christoph Lameter | 4b356be | 2007-06-16 10:16:13 -0700 | [diff] [blame] | 3537 | " CPUs=%d, Nodes=%d\n", |
| 3538 | caches, cache_line_size(), |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3539 | slub_min_order, slub_max_order, slub_min_objects, |
| 3540 | nr_cpu_ids, nr_node_ids); |
| 3541 | } |
| 3542 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 3543 | void __init kmem_cache_init_late(void) |
| 3544 | { |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 3545 | } |
| 3546 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3547 | /* |
| 3548 | * Find a mergeable slab cache |
| 3549 | */ |
| 3550 | static int slab_unmergeable(struct kmem_cache *s) |
| 3551 | { |
| 3552 | if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE)) |
| 3553 | return 1; |
| 3554 | |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3555 | if (s->ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3556 | return 1; |
| 3557 | |
Christoph Lameter | 8ffa687 | 2007-05-31 00:40:51 -0700 | [diff] [blame] | 3558 | /* |
| 3559 | * We may have set a slab to be unmergeable during bootstrap. |
| 3560 | */ |
| 3561 | if (s->refcount < 0) |
| 3562 | return 1; |
| 3563 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3564 | return 0; |
| 3565 | } |
| 3566 | |
| 3567 | static struct kmem_cache *find_mergeable(size_t size, |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3568 | size_t align, unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 3569 | void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3570 | { |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3571 | struct kmem_cache *s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3572 | |
| 3573 | if (slub_nomerge || (flags & SLUB_NEVER_MERGE)) |
| 3574 | return NULL; |
| 3575 | |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3576 | if (ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3577 | return NULL; |
| 3578 | |
| 3579 | size = ALIGN(size, sizeof(void *)); |
| 3580 | align = calculate_alignment(flags, align, size); |
| 3581 | size = ALIGN(size, align); |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3582 | flags = kmem_cache_flags(size, flags, name, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3583 | |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3584 | list_for_each_entry(s, &slab_caches, list) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3585 | if (slab_unmergeable(s)) |
| 3586 | continue; |
| 3587 | |
| 3588 | if (size > s->size) |
| 3589 | continue; |
| 3590 | |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3591 | if ((flags & SLUB_MERGE_SAME) != (s->flags & SLUB_MERGE_SAME)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3592 | continue; |
| 3593 | /* |
| 3594 | * Check if alignment is compatible. |
| 3595 | * Courtesy of Adrian Drzewiecki |
| 3596 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3597 | if ((s->size & ~(align - 1)) != s->size) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3598 | continue; |
| 3599 | |
| 3600 | if (s->size - size >= sizeof(void *)) |
| 3601 | continue; |
| 3602 | |
| 3603 | return s; |
| 3604 | } |
| 3605 | return NULL; |
| 3606 | } |
| 3607 | |
| 3608 | struct kmem_cache *kmem_cache_create(const char *name, size_t size, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 3609 | size_t align, unsigned long flags, void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3610 | { |
| 3611 | struct kmem_cache *s; |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3612 | char *n; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3613 | |
Benjamin Herrenschmidt | fe1ff49 | 2009-09-21 17:02:30 -0700 | [diff] [blame] | 3614 | if (WARN_ON(!name)) |
| 3615 | return NULL; |
| 3616 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3617 | down_write(&slub_lock); |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3618 | s = find_mergeable(size, align, flags, name, ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3619 | if (s) { |
| 3620 | s->refcount++; |
| 3621 | /* |
| 3622 | * Adjust the object sizes so that we clear |
| 3623 | * the complete object on kzalloc. |
| 3624 | */ |
| 3625 | s->objsize = max(s->objsize, (int)size); |
| 3626 | s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3627 | |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3628 | if (sysfs_slab_alias(s, name)) { |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3629 | s->refcount--; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3630 | goto err; |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3631 | } |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 3632 | up_write(&slub_lock); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3633 | return s; |
| 3634 | } |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3635 | |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3636 | n = kstrdup(name, GFP_KERNEL); |
| 3637 | if (!n) |
| 3638 | goto err; |
| 3639 | |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3640 | s = kmalloc(kmem_size, GFP_KERNEL); |
| 3641 | if (s) { |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3642 | if (kmem_cache_open(s, n, |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3643 | size, align, flags, ctor)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3644 | list_add(&s->list, &slab_caches); |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3645 | if (sysfs_slab_add(s)) { |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3646 | list_del(&s->list); |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3647 | kfree(n); |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3648 | kfree(s); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3649 | goto err; |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3650 | } |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 3651 | up_write(&slub_lock); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3652 | return s; |
| 3653 | } |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3654 | kfree(n); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3655 | kfree(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3656 | } |
Pavel Emelyanov | 68cee4f | 2010-10-28 13:50:37 +0400 | [diff] [blame] | 3657 | err: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3658 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3659 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3660 | if (flags & SLAB_PANIC) |
| 3661 | panic("Cannot create slabcache %s\n", name); |
| 3662 | else |
| 3663 | s = NULL; |
| 3664 | return s; |
| 3665 | } |
| 3666 | EXPORT_SYMBOL(kmem_cache_create); |
| 3667 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3668 | #ifdef CONFIG_SMP |
Christoph Lameter | 27390bc | 2007-06-01 00:47:09 -0700 | [diff] [blame] | 3669 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3670 | * Use the cpu notifier to insure that the cpu slabs are flushed when |
| 3671 | * necessary. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3672 | */ |
| 3673 | static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb, |
| 3674 | unsigned long action, void *hcpu) |
| 3675 | { |
| 3676 | long cpu = (long)hcpu; |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3677 | struct kmem_cache *s; |
| 3678 | unsigned long flags; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3679 | |
| 3680 | switch (action) { |
| 3681 | case CPU_UP_CANCELED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 3682 | case CPU_UP_CANCELED_FROZEN: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3683 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 3684 | case CPU_DEAD_FROZEN: |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3685 | down_read(&slub_lock); |
| 3686 | list_for_each_entry(s, &slab_caches, list) { |
| 3687 | local_irq_save(flags); |
| 3688 | __flush_cpu_slab(s, cpu); |
| 3689 | local_irq_restore(flags); |
| 3690 | } |
| 3691 | up_read(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3692 | break; |
| 3693 | default: |
| 3694 | break; |
| 3695 | } |
| 3696 | return NOTIFY_OK; |
| 3697 | } |
| 3698 | |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3699 | static struct notifier_block __cpuinitdata slab_notifier = { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 3700 | .notifier_call = slab_cpuup_callback |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3701 | }; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3702 | |
| 3703 | #endif |
| 3704 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3705 | 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] | 3706 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3707 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3708 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3709 | |
Christoph Lameter | ffadd4d | 2009-02-17 12:05:07 -0500 | [diff] [blame] | 3710 | if (unlikely(size > SLUB_MAX_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3711 | return kmalloc_large(size, gfpflags); |
| 3712 | |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3713 | s = get_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3714 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3715 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3716 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3717 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 3718 | ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, caller); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3719 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3720 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3721 | trace_kmalloc(caller, ret, size, s->size, gfpflags); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3722 | |
| 3723 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3724 | } |
| 3725 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3726 | #ifdef CONFIG_NUMA |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3727 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3728 | int node, unsigned long caller) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3729 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3730 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3731 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3732 | |
Xiaotian Feng | d3e14aa | 2010-04-08 17:26:44 +0800 | [diff] [blame] | 3733 | if (unlikely(size > SLUB_MAX_SIZE)) { |
| 3734 | ret = kmalloc_large_node(size, gfpflags, node); |
| 3735 | |
| 3736 | trace_kmalloc_node(caller, ret, |
| 3737 | size, PAGE_SIZE << get_order(size), |
| 3738 | gfpflags, node); |
| 3739 | |
| 3740 | return ret; |
| 3741 | } |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3742 | |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3743 | s = get_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3744 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3745 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3746 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3747 | |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3748 | ret = slab_alloc(s, gfpflags, node, caller); |
| 3749 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3750 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3751 | trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3752 | |
| 3753 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3754 | } |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3755 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3756 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3757 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3758 | static int count_inuse(struct page *page) |
| 3759 | { |
| 3760 | return page->inuse; |
| 3761 | } |
| 3762 | |
| 3763 | static int count_total(struct page *page) |
| 3764 | { |
| 3765 | return page->objects; |
| 3766 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3767 | #endif |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3768 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3769 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3770 | static int validate_slab(struct kmem_cache *s, struct page *page, |
| 3771 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3772 | { |
| 3773 | void *p; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 3774 | void *addr = page_address(page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3775 | |
| 3776 | if (!check_slab(s, page) || |
| 3777 | !on_freelist(s, page, NULL)) |
| 3778 | return 0; |
| 3779 | |
| 3780 | /* Now we know that a valid freelist exists */ |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 3781 | bitmap_zero(map, page->objects); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3782 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 3783 | get_map(s, page, map); |
| 3784 | for_each_object(p, s, addr, page->objects) { |
| 3785 | if (test_bit(slab_index(p, s, addr), map)) |
| 3786 | if (!check_object(s, page, p, SLUB_RED_INACTIVE)) |
| 3787 | return 0; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3788 | } |
| 3789 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3790 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 3791 | if (!test_bit(slab_index(p, s, addr), map)) |
Tero Roponen | 37d5744 | 2010-12-01 20:04:20 +0200 | [diff] [blame] | 3792 | if (!check_object(s, page, p, SLUB_RED_ACTIVE)) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3793 | return 0; |
| 3794 | return 1; |
| 3795 | } |
| 3796 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3797 | static void validate_slab_slab(struct kmem_cache *s, struct page *page, |
| 3798 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3799 | { |
| 3800 | if (slab_trylock(page)) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3801 | validate_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3802 | slab_unlock(page); |
| 3803 | } else |
| 3804 | printk(KERN_INFO "SLUB %s: Skipped busy slab 0x%p\n", |
| 3805 | s->name, page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3806 | } |
| 3807 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3808 | static int validate_slab_node(struct kmem_cache *s, |
| 3809 | struct kmem_cache_node *n, unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3810 | { |
| 3811 | unsigned long count = 0; |
| 3812 | struct page *page; |
| 3813 | unsigned long flags; |
| 3814 | |
| 3815 | spin_lock_irqsave(&n->list_lock, flags); |
| 3816 | |
| 3817 | list_for_each_entry(page, &n->partial, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3818 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3819 | count++; |
| 3820 | } |
| 3821 | if (count != n->nr_partial) |
| 3822 | printk(KERN_ERR "SLUB %s: %ld partial slabs counted but " |
| 3823 | "counter=%ld\n", s->name, count, n->nr_partial); |
| 3824 | |
| 3825 | if (!(s->flags & SLAB_STORE_USER)) |
| 3826 | goto out; |
| 3827 | |
| 3828 | list_for_each_entry(page, &n->full, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3829 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3830 | count++; |
| 3831 | } |
| 3832 | if (count != atomic_long_read(&n->nr_slabs)) |
| 3833 | printk(KERN_ERR "SLUB: %s %ld slabs counted but " |
| 3834 | "counter=%ld\n", s->name, count, |
| 3835 | atomic_long_read(&n->nr_slabs)); |
| 3836 | |
| 3837 | out: |
| 3838 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 3839 | return count; |
| 3840 | } |
| 3841 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3842 | static long validate_slab_cache(struct kmem_cache *s) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3843 | { |
| 3844 | int node; |
| 3845 | unsigned long count = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3846 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3847 | sizeof(unsigned long), GFP_KERNEL); |
| 3848 | |
| 3849 | if (!map) |
| 3850 | return -ENOMEM; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3851 | |
| 3852 | flush_all(s); |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3853 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3854 | struct kmem_cache_node *n = get_node(s, node); |
| 3855 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3856 | count += validate_slab_node(s, n, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3857 | } |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3858 | kfree(map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3859 | return count; |
| 3860 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3861 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3862 | * Generate lists of code addresses where slabcache objects are allocated |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3863 | * and freed. |
| 3864 | */ |
| 3865 | |
| 3866 | struct location { |
| 3867 | unsigned long count; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3868 | unsigned long addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3869 | long long sum_time; |
| 3870 | long min_time; |
| 3871 | long max_time; |
| 3872 | long min_pid; |
| 3873 | long max_pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 3874 | DECLARE_BITMAP(cpus, NR_CPUS); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3875 | nodemask_t nodes; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3876 | }; |
| 3877 | |
| 3878 | struct loc_track { |
| 3879 | unsigned long max; |
| 3880 | unsigned long count; |
| 3881 | struct location *loc; |
| 3882 | }; |
| 3883 | |
| 3884 | static void free_loc_track(struct loc_track *t) |
| 3885 | { |
| 3886 | if (t->max) |
| 3887 | free_pages((unsigned long)t->loc, |
| 3888 | get_order(sizeof(struct location) * t->max)); |
| 3889 | } |
| 3890 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 3891 | 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] | 3892 | { |
| 3893 | struct location *l; |
| 3894 | int order; |
| 3895 | |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3896 | order = get_order(sizeof(struct location) * max); |
| 3897 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 3898 | l = (void *)__get_free_pages(flags, order); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3899 | if (!l) |
| 3900 | return 0; |
| 3901 | |
| 3902 | if (t->count) { |
| 3903 | memcpy(l, t->loc, sizeof(struct location) * t->count); |
| 3904 | free_loc_track(t); |
| 3905 | } |
| 3906 | t->max = max; |
| 3907 | t->loc = l; |
| 3908 | return 1; |
| 3909 | } |
| 3910 | |
| 3911 | static int add_location(struct loc_track *t, struct kmem_cache *s, |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3912 | const struct track *track) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3913 | { |
| 3914 | long start, end, pos; |
| 3915 | struct location *l; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3916 | unsigned long caddr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3917 | unsigned long age = jiffies - track->when; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3918 | |
| 3919 | start = -1; |
| 3920 | end = t->count; |
| 3921 | |
| 3922 | for ( ; ; ) { |
| 3923 | pos = start + (end - start + 1) / 2; |
| 3924 | |
| 3925 | /* |
| 3926 | * There is nothing at "end". If we end up there |
| 3927 | * we need to add something to before end. |
| 3928 | */ |
| 3929 | if (pos == end) |
| 3930 | break; |
| 3931 | |
| 3932 | caddr = t->loc[pos].addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3933 | if (track->addr == caddr) { |
| 3934 | |
| 3935 | l = &t->loc[pos]; |
| 3936 | l->count++; |
| 3937 | if (track->when) { |
| 3938 | l->sum_time += age; |
| 3939 | if (age < l->min_time) |
| 3940 | l->min_time = age; |
| 3941 | if (age > l->max_time) |
| 3942 | l->max_time = age; |
| 3943 | |
| 3944 | if (track->pid < l->min_pid) |
| 3945 | l->min_pid = track->pid; |
| 3946 | if (track->pid > l->max_pid) |
| 3947 | l->max_pid = track->pid; |
| 3948 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 3949 | cpumask_set_cpu(track->cpu, |
| 3950 | to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3951 | } |
| 3952 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3953 | return 1; |
| 3954 | } |
| 3955 | |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3956 | if (track->addr < caddr) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3957 | end = pos; |
| 3958 | else |
| 3959 | start = pos; |
| 3960 | } |
| 3961 | |
| 3962 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3963 | * Not found. Insert new tracking element. |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3964 | */ |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 3965 | 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] | 3966 | return 0; |
| 3967 | |
| 3968 | l = t->loc + pos; |
| 3969 | if (pos < t->count) |
| 3970 | memmove(l + 1, l, |
| 3971 | (t->count - pos) * sizeof(struct location)); |
| 3972 | t->count++; |
| 3973 | l->count = 1; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3974 | l->addr = track->addr; |
| 3975 | l->sum_time = age; |
| 3976 | l->min_time = age; |
| 3977 | l->max_time = age; |
| 3978 | l->min_pid = track->pid; |
| 3979 | l->max_pid = track->pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 3980 | cpumask_clear(to_cpumask(l->cpus)); |
| 3981 | cpumask_set_cpu(track->cpu, to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3982 | nodes_clear(l->nodes); |
| 3983 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3984 | return 1; |
| 3985 | } |
| 3986 | |
| 3987 | static void process_slab(struct loc_track *t, struct kmem_cache *s, |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 3988 | struct page *page, enum track_item alloc, |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 3989 | unsigned long *map) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3990 | { |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 3991 | void *addr = page_address(page); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3992 | void *p; |
| 3993 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 3994 | bitmap_zero(map, page->objects); |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 3995 | get_map(s, page, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3996 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3997 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3998 | if (!test_bit(slab_index(p, s, addr), map)) |
| 3999 | add_location(t, s, get_track(s, p, alloc)); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4000 | } |
| 4001 | |
| 4002 | static int list_locations(struct kmem_cache *s, char *buf, |
| 4003 | enum track_item alloc) |
| 4004 | { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4005 | int len = 0; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4006 | unsigned long i; |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4007 | struct loc_track t = { 0, 0, NULL }; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4008 | int node; |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4009 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
| 4010 | sizeof(unsigned long), GFP_KERNEL); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4011 | |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4012 | if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location), |
| 4013 | GFP_TEMPORARY)) { |
| 4014 | kfree(map); |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4015 | return sprintf(buf, "Out of memory\n"); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4016 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4017 | /* Push back cpu slabs */ |
| 4018 | flush_all(s); |
| 4019 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 4020 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4021 | struct kmem_cache_node *n = get_node(s, node); |
| 4022 | unsigned long flags; |
| 4023 | struct page *page; |
| 4024 | |
Christoph Lameter | 9e86943 | 2007-08-22 14:01:56 -0700 | [diff] [blame] | 4025 | if (!atomic_long_read(&n->nr_slabs)) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4026 | continue; |
| 4027 | |
| 4028 | spin_lock_irqsave(&n->list_lock, flags); |
| 4029 | list_for_each_entry(page, &n->partial, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4030 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4031 | list_for_each_entry(page, &n->full, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4032 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4033 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 4034 | } |
| 4035 | |
| 4036 | for (i = 0; i < t.count; i++) { |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4037 | struct location *l = &t.loc[i]; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4038 | |
Hugh Dickins | 9c24624 | 2008-12-09 13:14:27 -0800 | [diff] [blame] | 4039 | if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4040 | break; |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4041 | len += sprintf(buf + len, "%7ld ", l->count); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4042 | |
| 4043 | if (l->addr) |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4044 | len += sprintf(buf + len, "%pS", (void *)l->addr); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4045 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4046 | len += sprintf(buf + len, "<not-available>"); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4047 | |
| 4048 | if (l->sum_time != l->min_time) { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4049 | len += sprintf(buf + len, " age=%ld/%ld/%ld", |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 4050 | l->min_time, |
| 4051 | (long)div_u64(l->sum_time, l->count), |
| 4052 | l->max_time); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4053 | } else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4054 | len += sprintf(buf + len, " age=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4055 | l->min_time); |
| 4056 | |
| 4057 | if (l->min_pid != l->max_pid) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4058 | len += sprintf(buf + len, " pid=%ld-%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4059 | l->min_pid, l->max_pid); |
| 4060 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4061 | len += sprintf(buf + len, " pid=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4062 | l->min_pid); |
| 4063 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4064 | if (num_online_cpus() > 1 && |
| 4065 | !cpumask_empty(to_cpumask(l->cpus)) && |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4066 | len < PAGE_SIZE - 60) { |
| 4067 | len += sprintf(buf + len, " cpus="); |
| 4068 | len += cpulist_scnprintf(buf + len, PAGE_SIZE - len - 50, |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4069 | to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4070 | } |
| 4071 | |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 4072 | if (nr_online_nodes > 1 && !nodes_empty(l->nodes) && |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4073 | len < PAGE_SIZE - 60) { |
| 4074 | len += sprintf(buf + len, " nodes="); |
| 4075 | len += nodelist_scnprintf(buf + len, PAGE_SIZE - len - 50, |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4076 | l->nodes); |
| 4077 | } |
| 4078 | |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4079 | len += sprintf(buf + len, "\n"); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4080 | } |
| 4081 | |
| 4082 | free_loc_track(&t); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4083 | kfree(map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4084 | if (!t.count) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4085 | len += sprintf(buf, "No data\n"); |
| 4086 | return len; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4087 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4088 | #endif |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4089 | |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4090 | #ifdef SLUB_RESILIENCY_TEST |
| 4091 | static void resiliency_test(void) |
| 4092 | { |
| 4093 | u8 *p; |
| 4094 | |
| 4095 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || SLUB_PAGE_SHIFT < 10); |
| 4096 | |
| 4097 | printk(KERN_ERR "SLUB resiliency testing\n"); |
| 4098 | printk(KERN_ERR "-----------------------\n"); |
| 4099 | printk(KERN_ERR "A. Corruption after allocation\n"); |
| 4100 | |
| 4101 | p = kzalloc(16, GFP_KERNEL); |
| 4102 | p[16] = 0x12; |
| 4103 | printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer" |
| 4104 | " 0x12->0x%p\n\n", p + 16); |
| 4105 | |
| 4106 | validate_slab_cache(kmalloc_caches[4]); |
| 4107 | |
| 4108 | /* Hmmm... The next two are dangerous */ |
| 4109 | p = kzalloc(32, GFP_KERNEL); |
| 4110 | p[32 + sizeof(void *)] = 0x34; |
| 4111 | printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab" |
| 4112 | " 0x34 -> -0x%p\n", p); |
| 4113 | printk(KERN_ERR |
| 4114 | "If allocated object is overwritten then not detectable\n\n"); |
| 4115 | |
| 4116 | validate_slab_cache(kmalloc_caches[5]); |
| 4117 | p = kzalloc(64, GFP_KERNEL); |
| 4118 | p += 64 + (get_cycles() & 0xff) * sizeof(void *); |
| 4119 | *p = 0x56; |
| 4120 | printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n", |
| 4121 | p); |
| 4122 | printk(KERN_ERR |
| 4123 | "If allocated object is overwritten then not detectable\n\n"); |
| 4124 | validate_slab_cache(kmalloc_caches[6]); |
| 4125 | |
| 4126 | printk(KERN_ERR "\nB. Corruption after free\n"); |
| 4127 | p = kzalloc(128, GFP_KERNEL); |
| 4128 | kfree(p); |
| 4129 | *p = 0x78; |
| 4130 | printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p); |
| 4131 | validate_slab_cache(kmalloc_caches[7]); |
| 4132 | |
| 4133 | p = kzalloc(256, GFP_KERNEL); |
| 4134 | kfree(p); |
| 4135 | p[50] = 0x9a; |
| 4136 | printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", |
| 4137 | p); |
| 4138 | validate_slab_cache(kmalloc_caches[8]); |
| 4139 | |
| 4140 | p = kzalloc(512, GFP_KERNEL); |
| 4141 | kfree(p); |
| 4142 | p[512] = 0xab; |
| 4143 | printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p); |
| 4144 | validate_slab_cache(kmalloc_caches[9]); |
| 4145 | } |
| 4146 | #else |
| 4147 | #ifdef CONFIG_SYSFS |
| 4148 | static void resiliency_test(void) {}; |
| 4149 | #endif |
| 4150 | #endif |
| 4151 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4152 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4153 | enum slab_stat_type { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4154 | SL_ALL, /* All slabs */ |
| 4155 | SL_PARTIAL, /* Only partially allocated slabs */ |
| 4156 | SL_CPU, /* Only slabs used for cpu caches */ |
| 4157 | SL_OBJECTS, /* Determine allocated objects not slabs */ |
| 4158 | SL_TOTAL /* Determine object capacity not slabs */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4159 | }; |
| 4160 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4161 | #define SO_ALL (1 << SL_ALL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4162 | #define SO_PARTIAL (1 << SL_PARTIAL) |
| 4163 | #define SO_CPU (1 << SL_CPU) |
| 4164 | #define SO_OBJECTS (1 << SL_OBJECTS) |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4165 | #define SO_TOTAL (1 << SL_TOTAL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4166 | |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4167 | static ssize_t show_slab_objects(struct kmem_cache *s, |
| 4168 | char *buf, unsigned long flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4169 | { |
| 4170 | unsigned long total = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4171 | int node; |
| 4172 | int x; |
| 4173 | unsigned long *nodes; |
| 4174 | unsigned long *per_cpu; |
| 4175 | |
| 4176 | nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL); |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4177 | if (!nodes) |
| 4178 | return -ENOMEM; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4179 | per_cpu = nodes + nr_node_ids; |
| 4180 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4181 | if (flags & SO_CPU) { |
| 4182 | int cpu; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4183 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4184 | for_each_possible_cpu(cpu) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4185 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4186 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4187 | if (!c || c->node < 0) |
| 4188 | continue; |
| 4189 | |
| 4190 | if (c->page) { |
| 4191 | if (flags & SO_TOTAL) |
| 4192 | x = c->page->objects; |
| 4193 | else if (flags & SO_OBJECTS) |
| 4194 | x = c->page->inuse; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4195 | else |
| 4196 | x = 1; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4197 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4198 | total += x; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4199 | nodes[c->node] += x; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4200 | } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4201 | per_cpu[c->node]++; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4202 | } |
| 4203 | } |
| 4204 | |
Christoph Lameter | 04d9487 | 2011-01-10 10:15:15 -0600 | [diff] [blame] | 4205 | lock_memory_hotplug(); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4206 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4207 | if (flags & SO_ALL) { |
| 4208 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 4209 | struct kmem_cache_node *n = get_node(s, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4210 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4211 | if (flags & SO_TOTAL) |
| 4212 | x = atomic_long_read(&n->total_objects); |
| 4213 | else if (flags & SO_OBJECTS) |
| 4214 | x = atomic_long_read(&n->total_objects) - |
| 4215 | count_partial(n, count_free); |
| 4216 | |
| 4217 | else |
| 4218 | x = atomic_long_read(&n->nr_slabs); |
| 4219 | total += x; |
| 4220 | nodes[node] += x; |
| 4221 | } |
| 4222 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4223 | } else |
| 4224 | #endif |
| 4225 | if (flags & SO_PARTIAL) { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4226 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 4227 | struct kmem_cache_node *n = get_node(s, node); |
| 4228 | |
| 4229 | if (flags & SO_TOTAL) |
| 4230 | x = count_partial(n, count_total); |
| 4231 | else if (flags & SO_OBJECTS) |
| 4232 | x = count_partial(n, count_inuse); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4233 | else |
| 4234 | x = n->nr_partial; |
| 4235 | total += x; |
| 4236 | nodes[node] += x; |
| 4237 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4238 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4239 | x = sprintf(buf, "%lu", total); |
| 4240 | #ifdef CONFIG_NUMA |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 4241 | for_each_node_state(node, N_NORMAL_MEMORY) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4242 | if (nodes[node]) |
| 4243 | x += sprintf(buf + x, " N%d=%lu", |
| 4244 | node, nodes[node]); |
| 4245 | #endif |
Christoph Lameter | 04d9487 | 2011-01-10 10:15:15 -0600 | [diff] [blame] | 4246 | unlock_memory_hotplug(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4247 | kfree(nodes); |
| 4248 | return x + sprintf(buf + x, "\n"); |
| 4249 | } |
| 4250 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4251 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4252 | static int any_slab_objects(struct kmem_cache *s) |
| 4253 | { |
| 4254 | int node; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4255 | |
| 4256 | for_each_online_node(node) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4257 | struct kmem_cache_node *n = get_node(s, node); |
| 4258 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4259 | if (!n) |
| 4260 | continue; |
| 4261 | |
Benjamin Herrenschmidt | 4ea33e2 | 2008-05-06 20:42:39 -0700 | [diff] [blame] | 4262 | if (atomic_long_read(&n->total_objects)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4263 | return 1; |
| 4264 | } |
| 4265 | return 0; |
| 4266 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4267 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4268 | |
| 4269 | #define to_slab_attr(n) container_of(n, struct slab_attribute, attr) |
| 4270 | #define to_slab(n) container_of(n, struct kmem_cache, kobj); |
| 4271 | |
| 4272 | struct slab_attribute { |
| 4273 | struct attribute attr; |
| 4274 | ssize_t (*show)(struct kmem_cache *s, char *buf); |
| 4275 | ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count); |
| 4276 | }; |
| 4277 | |
| 4278 | #define SLAB_ATTR_RO(_name) \ |
| 4279 | static struct slab_attribute _name##_attr = __ATTR_RO(_name) |
| 4280 | |
| 4281 | #define SLAB_ATTR(_name) \ |
| 4282 | static struct slab_attribute _name##_attr = \ |
| 4283 | __ATTR(_name, 0644, _name##_show, _name##_store) |
| 4284 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4285 | static ssize_t slab_size_show(struct kmem_cache *s, char *buf) |
| 4286 | { |
| 4287 | return sprintf(buf, "%d\n", s->size); |
| 4288 | } |
| 4289 | SLAB_ATTR_RO(slab_size); |
| 4290 | |
| 4291 | static ssize_t align_show(struct kmem_cache *s, char *buf) |
| 4292 | { |
| 4293 | return sprintf(buf, "%d\n", s->align); |
| 4294 | } |
| 4295 | SLAB_ATTR_RO(align); |
| 4296 | |
| 4297 | static ssize_t object_size_show(struct kmem_cache *s, char *buf) |
| 4298 | { |
| 4299 | return sprintf(buf, "%d\n", s->objsize); |
| 4300 | } |
| 4301 | SLAB_ATTR_RO(object_size); |
| 4302 | |
| 4303 | static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf) |
| 4304 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4305 | return sprintf(buf, "%d\n", oo_objects(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4306 | } |
| 4307 | SLAB_ATTR_RO(objs_per_slab); |
| 4308 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4309 | static ssize_t order_store(struct kmem_cache *s, |
| 4310 | const char *buf, size_t length) |
| 4311 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4312 | unsigned long order; |
| 4313 | int err; |
| 4314 | |
| 4315 | err = strict_strtoul(buf, 10, &order); |
| 4316 | if (err) |
| 4317 | return err; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4318 | |
| 4319 | if (order > slub_max_order || order < slub_min_order) |
| 4320 | return -EINVAL; |
| 4321 | |
| 4322 | calculate_sizes(s, order); |
| 4323 | return length; |
| 4324 | } |
| 4325 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4326 | static ssize_t order_show(struct kmem_cache *s, char *buf) |
| 4327 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4328 | return sprintf(buf, "%d\n", oo_order(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4329 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4330 | SLAB_ATTR(order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4331 | |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4332 | static ssize_t min_partial_show(struct kmem_cache *s, char *buf) |
| 4333 | { |
| 4334 | return sprintf(buf, "%lu\n", s->min_partial); |
| 4335 | } |
| 4336 | |
| 4337 | static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, |
| 4338 | size_t length) |
| 4339 | { |
| 4340 | unsigned long min; |
| 4341 | int err; |
| 4342 | |
| 4343 | err = strict_strtoul(buf, 10, &min); |
| 4344 | if (err) |
| 4345 | return err; |
| 4346 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 4347 | set_min_partial(s, min); |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4348 | return length; |
| 4349 | } |
| 4350 | SLAB_ATTR(min_partial); |
| 4351 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4352 | static ssize_t ctor_show(struct kmem_cache *s, char *buf) |
| 4353 | { |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4354 | if (!s->ctor) |
| 4355 | return 0; |
| 4356 | return sprintf(buf, "%pS\n", s->ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4357 | } |
| 4358 | SLAB_ATTR_RO(ctor); |
| 4359 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4360 | static ssize_t aliases_show(struct kmem_cache *s, char *buf) |
| 4361 | { |
| 4362 | return sprintf(buf, "%d\n", s->refcount - 1); |
| 4363 | } |
| 4364 | SLAB_ATTR_RO(aliases); |
| 4365 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4366 | static ssize_t partial_show(struct kmem_cache *s, char *buf) |
| 4367 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4368 | return show_slab_objects(s, buf, SO_PARTIAL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4369 | } |
| 4370 | SLAB_ATTR_RO(partial); |
| 4371 | |
| 4372 | static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf) |
| 4373 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4374 | return show_slab_objects(s, buf, SO_CPU); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4375 | } |
| 4376 | SLAB_ATTR_RO(cpu_slabs); |
| 4377 | |
| 4378 | static ssize_t objects_show(struct kmem_cache *s, char *buf) |
| 4379 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4380 | return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4381 | } |
| 4382 | SLAB_ATTR_RO(objects); |
| 4383 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4384 | static ssize_t objects_partial_show(struct kmem_cache *s, char *buf) |
| 4385 | { |
| 4386 | return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS); |
| 4387 | } |
| 4388 | SLAB_ATTR_RO(objects_partial); |
| 4389 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4390 | static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf) |
| 4391 | { |
| 4392 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT)); |
| 4393 | } |
| 4394 | |
| 4395 | static ssize_t reclaim_account_store(struct kmem_cache *s, |
| 4396 | const char *buf, size_t length) |
| 4397 | { |
| 4398 | s->flags &= ~SLAB_RECLAIM_ACCOUNT; |
| 4399 | if (buf[0] == '1') |
| 4400 | s->flags |= SLAB_RECLAIM_ACCOUNT; |
| 4401 | return length; |
| 4402 | } |
| 4403 | SLAB_ATTR(reclaim_account); |
| 4404 | |
| 4405 | static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf) |
| 4406 | { |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 4407 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4408 | } |
| 4409 | SLAB_ATTR_RO(hwcache_align); |
| 4410 | |
| 4411 | #ifdef CONFIG_ZONE_DMA |
| 4412 | static ssize_t cache_dma_show(struct kmem_cache *s, char *buf) |
| 4413 | { |
| 4414 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA)); |
| 4415 | } |
| 4416 | SLAB_ATTR_RO(cache_dma); |
| 4417 | #endif |
| 4418 | |
| 4419 | static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf) |
| 4420 | { |
| 4421 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU)); |
| 4422 | } |
| 4423 | SLAB_ATTR_RO(destroy_by_rcu); |
| 4424 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 4425 | static ssize_t reserved_show(struct kmem_cache *s, char *buf) |
| 4426 | { |
| 4427 | return sprintf(buf, "%d\n", s->reserved); |
| 4428 | } |
| 4429 | SLAB_ATTR_RO(reserved); |
| 4430 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4431 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4432 | static ssize_t slabs_show(struct kmem_cache *s, char *buf) |
| 4433 | { |
| 4434 | return show_slab_objects(s, buf, SO_ALL); |
| 4435 | } |
| 4436 | SLAB_ATTR_RO(slabs); |
| 4437 | |
| 4438 | static ssize_t total_objects_show(struct kmem_cache *s, char *buf) |
| 4439 | { |
| 4440 | return show_slab_objects(s, buf, SO_ALL|SO_TOTAL); |
| 4441 | } |
| 4442 | SLAB_ATTR_RO(total_objects); |
| 4443 | |
| 4444 | static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf) |
| 4445 | { |
| 4446 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DEBUG_FREE)); |
| 4447 | } |
| 4448 | |
| 4449 | static ssize_t sanity_checks_store(struct kmem_cache *s, |
| 4450 | const char *buf, size_t length) |
| 4451 | { |
| 4452 | s->flags &= ~SLAB_DEBUG_FREE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4453 | if (buf[0] == '1') { |
| 4454 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4455 | s->flags |= SLAB_DEBUG_FREE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4456 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4457 | return length; |
| 4458 | } |
| 4459 | SLAB_ATTR(sanity_checks); |
| 4460 | |
| 4461 | static ssize_t trace_show(struct kmem_cache *s, char *buf) |
| 4462 | { |
| 4463 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE)); |
| 4464 | } |
| 4465 | |
| 4466 | static ssize_t trace_store(struct kmem_cache *s, const char *buf, |
| 4467 | size_t length) |
| 4468 | { |
| 4469 | s->flags &= ~SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4470 | if (buf[0] == '1') { |
| 4471 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4472 | s->flags |= SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4473 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4474 | return length; |
| 4475 | } |
| 4476 | SLAB_ATTR(trace); |
| 4477 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4478 | static ssize_t red_zone_show(struct kmem_cache *s, char *buf) |
| 4479 | { |
| 4480 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE)); |
| 4481 | } |
| 4482 | |
| 4483 | static ssize_t red_zone_store(struct kmem_cache *s, |
| 4484 | const char *buf, size_t length) |
| 4485 | { |
| 4486 | if (any_slab_objects(s)) |
| 4487 | return -EBUSY; |
| 4488 | |
| 4489 | s->flags &= ~SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4490 | if (buf[0] == '1') { |
| 4491 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4492 | s->flags |= SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4493 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4494 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4495 | return length; |
| 4496 | } |
| 4497 | SLAB_ATTR(red_zone); |
| 4498 | |
| 4499 | static ssize_t poison_show(struct kmem_cache *s, char *buf) |
| 4500 | { |
| 4501 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON)); |
| 4502 | } |
| 4503 | |
| 4504 | static ssize_t poison_store(struct kmem_cache *s, |
| 4505 | const char *buf, size_t length) |
| 4506 | { |
| 4507 | if (any_slab_objects(s)) |
| 4508 | return -EBUSY; |
| 4509 | |
| 4510 | s->flags &= ~SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4511 | if (buf[0] == '1') { |
| 4512 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4513 | s->flags |= SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4514 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4515 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4516 | return length; |
| 4517 | } |
| 4518 | SLAB_ATTR(poison); |
| 4519 | |
| 4520 | static ssize_t store_user_show(struct kmem_cache *s, char *buf) |
| 4521 | { |
| 4522 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER)); |
| 4523 | } |
| 4524 | |
| 4525 | static ssize_t store_user_store(struct kmem_cache *s, |
| 4526 | const char *buf, size_t length) |
| 4527 | { |
| 4528 | if (any_slab_objects(s)) |
| 4529 | return -EBUSY; |
| 4530 | |
| 4531 | s->flags &= ~SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4532 | if (buf[0] == '1') { |
| 4533 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4534 | s->flags |= SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4535 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4536 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4537 | return length; |
| 4538 | } |
| 4539 | SLAB_ATTR(store_user); |
| 4540 | |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4541 | static ssize_t validate_show(struct kmem_cache *s, char *buf) |
| 4542 | { |
| 4543 | return 0; |
| 4544 | } |
| 4545 | |
| 4546 | static ssize_t validate_store(struct kmem_cache *s, |
| 4547 | const char *buf, size_t length) |
| 4548 | { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4549 | int ret = -EINVAL; |
| 4550 | |
| 4551 | if (buf[0] == '1') { |
| 4552 | ret = validate_slab_cache(s); |
| 4553 | if (ret >= 0) |
| 4554 | ret = length; |
| 4555 | } |
| 4556 | return ret; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4557 | } |
| 4558 | SLAB_ATTR(validate); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4559 | |
| 4560 | static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf) |
| 4561 | { |
| 4562 | if (!(s->flags & SLAB_STORE_USER)) |
| 4563 | return -ENOSYS; |
| 4564 | return list_locations(s, buf, TRACK_ALLOC); |
| 4565 | } |
| 4566 | SLAB_ATTR_RO(alloc_calls); |
| 4567 | |
| 4568 | static ssize_t free_calls_show(struct kmem_cache *s, char *buf) |
| 4569 | { |
| 4570 | if (!(s->flags & SLAB_STORE_USER)) |
| 4571 | return -ENOSYS; |
| 4572 | return list_locations(s, buf, TRACK_FREE); |
| 4573 | } |
| 4574 | SLAB_ATTR_RO(free_calls); |
| 4575 | #endif /* CONFIG_SLUB_DEBUG */ |
| 4576 | |
| 4577 | #ifdef CONFIG_FAILSLAB |
| 4578 | static ssize_t failslab_show(struct kmem_cache *s, char *buf) |
| 4579 | { |
| 4580 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB)); |
| 4581 | } |
| 4582 | |
| 4583 | static ssize_t failslab_store(struct kmem_cache *s, const char *buf, |
| 4584 | size_t length) |
| 4585 | { |
| 4586 | s->flags &= ~SLAB_FAILSLAB; |
| 4587 | if (buf[0] == '1') |
| 4588 | s->flags |= SLAB_FAILSLAB; |
| 4589 | return length; |
| 4590 | } |
| 4591 | SLAB_ATTR(failslab); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4592 | #endif |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4593 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 4594 | static ssize_t shrink_show(struct kmem_cache *s, char *buf) |
| 4595 | { |
| 4596 | return 0; |
| 4597 | } |
| 4598 | |
| 4599 | static ssize_t shrink_store(struct kmem_cache *s, |
| 4600 | const char *buf, size_t length) |
| 4601 | { |
| 4602 | if (buf[0] == '1') { |
| 4603 | int rc = kmem_cache_shrink(s); |
| 4604 | |
| 4605 | if (rc) |
| 4606 | return rc; |
| 4607 | } else |
| 4608 | return -EINVAL; |
| 4609 | return length; |
| 4610 | } |
| 4611 | SLAB_ATTR(shrink); |
| 4612 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4613 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4614 | 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] | 4615 | { |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4616 | return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4617 | } |
| 4618 | |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4619 | static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4620 | const char *buf, size_t length) |
| 4621 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4622 | unsigned long ratio; |
| 4623 | int err; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4624 | |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4625 | err = strict_strtoul(buf, 10, &ratio); |
| 4626 | if (err) |
| 4627 | return err; |
| 4628 | |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 4629 | if (ratio <= 100) |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4630 | s->remote_node_defrag_ratio = ratio * 10; |
| 4631 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4632 | return length; |
| 4633 | } |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4634 | SLAB_ATTR(remote_node_defrag_ratio); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4635 | #endif |
| 4636 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4637 | #ifdef CONFIG_SLUB_STATS |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4638 | static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) |
| 4639 | { |
| 4640 | unsigned long sum = 0; |
| 4641 | int cpu; |
| 4642 | int len; |
| 4643 | int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL); |
| 4644 | |
| 4645 | if (!data) |
| 4646 | return -ENOMEM; |
| 4647 | |
| 4648 | for_each_online_cpu(cpu) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4649 | unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4650 | |
| 4651 | data[cpu] = x; |
| 4652 | sum += x; |
| 4653 | } |
| 4654 | |
| 4655 | len = sprintf(buf, "%lu", sum); |
| 4656 | |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4657 | #ifdef CONFIG_SMP |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4658 | for_each_online_cpu(cpu) { |
| 4659 | if (data[cpu] && len < PAGE_SIZE - 20) |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4660 | len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4661 | } |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4662 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4663 | kfree(data); |
| 4664 | return len + sprintf(buf + len, "\n"); |
| 4665 | } |
| 4666 | |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4667 | static void clear_stat(struct kmem_cache *s, enum stat_item si) |
| 4668 | { |
| 4669 | int cpu; |
| 4670 | |
| 4671 | for_each_online_cpu(cpu) |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4672 | per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4673 | } |
| 4674 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4675 | #define STAT_ATTR(si, text) \ |
| 4676 | static ssize_t text##_show(struct kmem_cache *s, char *buf) \ |
| 4677 | { \ |
| 4678 | return show_stat(s, buf, si); \ |
| 4679 | } \ |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4680 | static ssize_t text##_store(struct kmem_cache *s, \ |
| 4681 | const char *buf, size_t length) \ |
| 4682 | { \ |
| 4683 | if (buf[0] != '0') \ |
| 4684 | return -EINVAL; \ |
| 4685 | clear_stat(s, si); \ |
| 4686 | return length; \ |
| 4687 | } \ |
| 4688 | SLAB_ATTR(text); \ |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4689 | |
| 4690 | STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); |
| 4691 | STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); |
| 4692 | STAT_ATTR(FREE_FASTPATH, free_fastpath); |
| 4693 | STAT_ATTR(FREE_SLOWPATH, free_slowpath); |
| 4694 | STAT_ATTR(FREE_FROZEN, free_frozen); |
| 4695 | STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); |
| 4696 | STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); |
| 4697 | STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); |
| 4698 | STAT_ATTR(ALLOC_SLAB, alloc_slab); |
| 4699 | STAT_ATTR(ALLOC_REFILL, alloc_refill); |
| 4700 | STAT_ATTR(FREE_SLAB, free_slab); |
| 4701 | STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); |
| 4702 | STAT_ATTR(DEACTIVATE_FULL, deactivate_full); |
| 4703 | STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); |
| 4704 | STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); |
| 4705 | STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); |
| 4706 | STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4707 | STAT_ATTR(ORDER_FALLBACK, order_fallback); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4708 | STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail); |
| 4709 | STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4710 | #endif |
| 4711 | |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 4712 | static struct attribute *slab_attrs[] = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4713 | &slab_size_attr.attr, |
| 4714 | &object_size_attr.attr, |
| 4715 | &objs_per_slab_attr.attr, |
| 4716 | &order_attr.attr, |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4717 | &min_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4718 | &objects_attr.attr, |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4719 | &objects_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4720 | &partial_attr.attr, |
| 4721 | &cpu_slabs_attr.attr, |
| 4722 | &ctor_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4723 | &aliases_attr.attr, |
| 4724 | &align_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4725 | &hwcache_align_attr.attr, |
| 4726 | &reclaim_account_attr.attr, |
| 4727 | &destroy_by_rcu_attr.attr, |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4728 | &shrink_attr.attr, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 4729 | &reserved_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4730 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4731 | &total_objects_attr.attr, |
| 4732 | &slabs_attr.attr, |
| 4733 | &sanity_checks_attr.attr, |
| 4734 | &trace_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4735 | &red_zone_attr.attr, |
| 4736 | &poison_attr.attr, |
| 4737 | &store_user_attr.attr, |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4738 | &validate_attr.attr, |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4739 | &alloc_calls_attr.attr, |
| 4740 | &free_calls_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4741 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4742 | #ifdef CONFIG_ZONE_DMA |
| 4743 | &cache_dma_attr.attr, |
| 4744 | #endif |
| 4745 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4746 | &remote_node_defrag_ratio_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4747 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4748 | #ifdef CONFIG_SLUB_STATS |
| 4749 | &alloc_fastpath_attr.attr, |
| 4750 | &alloc_slowpath_attr.attr, |
| 4751 | &free_fastpath_attr.attr, |
| 4752 | &free_slowpath_attr.attr, |
| 4753 | &free_frozen_attr.attr, |
| 4754 | &free_add_partial_attr.attr, |
| 4755 | &free_remove_partial_attr.attr, |
| 4756 | &alloc_from_partial_attr.attr, |
| 4757 | &alloc_slab_attr.attr, |
| 4758 | &alloc_refill_attr.attr, |
| 4759 | &free_slab_attr.attr, |
| 4760 | &cpuslab_flush_attr.attr, |
| 4761 | &deactivate_full_attr.attr, |
| 4762 | &deactivate_empty_attr.attr, |
| 4763 | &deactivate_to_head_attr.attr, |
| 4764 | &deactivate_to_tail_attr.attr, |
| 4765 | &deactivate_remote_frees_attr.attr, |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4766 | &order_fallback_attr.attr, |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4767 | &cmpxchg_double_fail_attr.attr, |
| 4768 | &cmpxchg_double_cpu_fail_attr.attr, |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4769 | #endif |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 4770 | #ifdef CONFIG_FAILSLAB |
| 4771 | &failslab_attr.attr, |
| 4772 | #endif |
| 4773 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4774 | NULL |
| 4775 | }; |
| 4776 | |
| 4777 | static struct attribute_group slab_attr_group = { |
| 4778 | .attrs = slab_attrs, |
| 4779 | }; |
| 4780 | |
| 4781 | static ssize_t slab_attr_show(struct kobject *kobj, |
| 4782 | struct attribute *attr, |
| 4783 | char *buf) |
| 4784 | { |
| 4785 | struct slab_attribute *attribute; |
| 4786 | struct kmem_cache *s; |
| 4787 | int err; |
| 4788 | |
| 4789 | attribute = to_slab_attr(attr); |
| 4790 | s = to_slab(kobj); |
| 4791 | |
| 4792 | if (!attribute->show) |
| 4793 | return -EIO; |
| 4794 | |
| 4795 | err = attribute->show(s, buf); |
| 4796 | |
| 4797 | return err; |
| 4798 | } |
| 4799 | |
| 4800 | static ssize_t slab_attr_store(struct kobject *kobj, |
| 4801 | struct attribute *attr, |
| 4802 | const char *buf, size_t len) |
| 4803 | { |
| 4804 | struct slab_attribute *attribute; |
| 4805 | struct kmem_cache *s; |
| 4806 | int err; |
| 4807 | |
| 4808 | attribute = to_slab_attr(attr); |
| 4809 | s = to_slab(kobj); |
| 4810 | |
| 4811 | if (!attribute->store) |
| 4812 | return -EIO; |
| 4813 | |
| 4814 | err = attribute->store(s, buf, len); |
| 4815 | |
| 4816 | return err; |
| 4817 | } |
| 4818 | |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4819 | static void kmem_cache_release(struct kobject *kobj) |
| 4820 | { |
| 4821 | struct kmem_cache *s = to_slab(kobj); |
| 4822 | |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 4823 | kfree(s->name); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4824 | kfree(s); |
| 4825 | } |
| 4826 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 4827 | static const struct sysfs_ops slab_sysfs_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4828 | .show = slab_attr_show, |
| 4829 | .store = slab_attr_store, |
| 4830 | }; |
| 4831 | |
| 4832 | static struct kobj_type slab_ktype = { |
| 4833 | .sysfs_ops = &slab_sysfs_ops, |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4834 | .release = kmem_cache_release |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4835 | }; |
| 4836 | |
| 4837 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| 4838 | { |
| 4839 | struct kobj_type *ktype = get_ktype(kobj); |
| 4840 | |
| 4841 | if (ktype == &slab_ktype) |
| 4842 | return 1; |
| 4843 | return 0; |
| 4844 | } |
| 4845 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 4846 | static const struct kset_uevent_ops slab_uevent_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4847 | .filter = uevent_filter, |
| 4848 | }; |
| 4849 | |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 4850 | static struct kset *slab_kset; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4851 | |
| 4852 | #define ID_STR_LENGTH 64 |
| 4853 | |
| 4854 | /* Create a unique string id for a slab cache: |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 4855 | * |
| 4856 | * Format :[flags-]size |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4857 | */ |
| 4858 | static char *create_unique_id(struct kmem_cache *s) |
| 4859 | { |
| 4860 | char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL); |
| 4861 | char *p = name; |
| 4862 | |
| 4863 | BUG_ON(!name); |
| 4864 | |
| 4865 | *p++ = ':'; |
| 4866 | /* |
| 4867 | * First flags affecting slabcache operations. We will only |
| 4868 | * get here for aliasable slabs so we do not need to support |
| 4869 | * too many flags. The flags here must cover all flags that |
| 4870 | * are matched during merging to guarantee that the id is |
| 4871 | * unique. |
| 4872 | */ |
| 4873 | if (s->flags & SLAB_CACHE_DMA) |
| 4874 | *p++ = 'd'; |
| 4875 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 4876 | *p++ = 'a'; |
| 4877 | if (s->flags & SLAB_DEBUG_FREE) |
| 4878 | *p++ = 'F'; |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 4879 | if (!(s->flags & SLAB_NOTRACK)) |
| 4880 | *p++ = 't'; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4881 | if (p != name + 1) |
| 4882 | *p++ = '-'; |
| 4883 | p += sprintf(p, "%07d", s->size); |
| 4884 | BUG_ON(p > name + ID_STR_LENGTH - 1); |
| 4885 | return name; |
| 4886 | } |
| 4887 | |
| 4888 | static int sysfs_slab_add(struct kmem_cache *s) |
| 4889 | { |
| 4890 | int err; |
| 4891 | const char *name; |
| 4892 | int unmergeable; |
| 4893 | |
| 4894 | if (slab_state < SYSFS) |
| 4895 | /* Defer until later */ |
| 4896 | return 0; |
| 4897 | |
| 4898 | unmergeable = slab_unmergeable(s); |
| 4899 | if (unmergeable) { |
| 4900 | /* |
| 4901 | * Slabcache can never be merged so we can use the name proper. |
| 4902 | * This is typically the case for debug situations. In that |
| 4903 | * case we can catch duplicate names easily. |
| 4904 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 4905 | sysfs_remove_link(&slab_kset->kobj, s->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4906 | name = s->name; |
| 4907 | } else { |
| 4908 | /* |
| 4909 | * Create a unique name for the slab as a target |
| 4910 | * for the symlinks. |
| 4911 | */ |
| 4912 | name = create_unique_id(s); |
| 4913 | } |
| 4914 | |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 4915 | s->kobj.kset = slab_kset; |
Greg Kroah-Hartman | 1eada11 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 4916 | err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, name); |
| 4917 | if (err) { |
| 4918 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4919 | return err; |
Greg Kroah-Hartman | 1eada11 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 4920 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4921 | |
| 4922 | err = sysfs_create_group(&s->kobj, &slab_attr_group); |
Xiaotian Feng | 5788d8a | 2009-07-22 11:28:53 +0800 | [diff] [blame] | 4923 | if (err) { |
| 4924 | kobject_del(&s->kobj); |
| 4925 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4926 | return err; |
Xiaotian Feng | 5788d8a | 2009-07-22 11:28:53 +0800 | [diff] [blame] | 4927 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4928 | kobject_uevent(&s->kobj, KOBJ_ADD); |
| 4929 | if (!unmergeable) { |
| 4930 | /* Setup first alias */ |
| 4931 | sysfs_slab_alias(s, s->name); |
| 4932 | kfree(name); |
| 4933 | } |
| 4934 | return 0; |
| 4935 | } |
| 4936 | |
| 4937 | static void sysfs_slab_remove(struct kmem_cache *s) |
| 4938 | { |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 4939 | if (slab_state < SYSFS) |
| 4940 | /* |
| 4941 | * Sysfs has not been setup yet so no need to remove the |
| 4942 | * cache from sysfs. |
| 4943 | */ |
| 4944 | return; |
| 4945 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4946 | kobject_uevent(&s->kobj, KOBJ_REMOVE); |
| 4947 | kobject_del(&s->kobj); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4948 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4949 | } |
| 4950 | |
| 4951 | /* |
| 4952 | * Need to buffer aliases during bootup until sysfs becomes |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 4953 | * available lest we lose that information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4954 | */ |
| 4955 | struct saved_alias { |
| 4956 | struct kmem_cache *s; |
| 4957 | const char *name; |
| 4958 | struct saved_alias *next; |
| 4959 | }; |
| 4960 | |
Adrian Bunk | 5af328a | 2007-07-17 04:03:27 -0700 | [diff] [blame] | 4961 | static struct saved_alias *alias_list; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4962 | |
| 4963 | static int sysfs_slab_alias(struct kmem_cache *s, const char *name) |
| 4964 | { |
| 4965 | struct saved_alias *al; |
| 4966 | |
| 4967 | if (slab_state == SYSFS) { |
| 4968 | /* |
| 4969 | * If we have a leftover link then remove it. |
| 4970 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 4971 | sysfs_remove_link(&slab_kset->kobj, name); |
| 4972 | return sysfs_create_link(&slab_kset->kobj, &s->kobj, name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4973 | } |
| 4974 | |
| 4975 | al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); |
| 4976 | if (!al) |
| 4977 | return -ENOMEM; |
| 4978 | |
| 4979 | al->s = s; |
| 4980 | al->name = name; |
| 4981 | al->next = alias_list; |
| 4982 | alias_list = al; |
| 4983 | return 0; |
| 4984 | } |
| 4985 | |
| 4986 | static int __init slab_sysfs_init(void) |
| 4987 | { |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 4988 | struct kmem_cache *s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4989 | int err; |
| 4990 | |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 4991 | down_write(&slub_lock); |
| 4992 | |
Greg Kroah-Hartman | 0ff21e4 | 2007-11-06 10:36:58 -0800 | [diff] [blame] | 4993 | 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] | 4994 | if (!slab_kset) { |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 4995 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4996 | printk(KERN_ERR "Cannot register slab subsystem.\n"); |
| 4997 | return -ENOSYS; |
| 4998 | } |
| 4999 | |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5000 | slab_state = SYSFS; |
| 5001 | |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 5002 | list_for_each_entry(s, &slab_caches, list) { |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5003 | err = sysfs_slab_add(s); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5004 | if (err) |
| 5005 | printk(KERN_ERR "SLUB: Unable to add boot slab %s" |
| 5006 | " to sysfs\n", s->name); |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5007 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5008 | |
| 5009 | while (alias_list) { |
| 5010 | struct saved_alias *al = alias_list; |
| 5011 | |
| 5012 | alias_list = alias_list->next; |
| 5013 | err = sysfs_slab_alias(al->s, al->name); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5014 | if (err) |
| 5015 | printk(KERN_ERR "SLUB: Unable to add boot slab alias" |
| 5016 | " %s to sysfs\n", s->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5017 | kfree(al); |
| 5018 | } |
| 5019 | |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5020 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5021 | resiliency_test(); |
| 5022 | return 0; |
| 5023 | } |
| 5024 | |
| 5025 | __initcall(slab_sysfs_init); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 5026 | #endif /* CONFIG_SYSFS */ |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5027 | |
| 5028 | /* |
| 5029 | * The /proc/slabinfo ABI |
| 5030 | */ |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5031 | #ifdef CONFIG_SLABINFO |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5032 | static void print_slabinfo_header(struct seq_file *m) |
| 5033 | { |
| 5034 | seq_puts(m, "slabinfo - version: 2.1\n"); |
| 5035 | seq_puts(m, "# name <active_objs> <num_objs> <objsize> " |
| 5036 | "<objperslab> <pagesperslab>"); |
| 5037 | seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>"); |
| 5038 | seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); |
| 5039 | seq_putc(m, '\n'); |
| 5040 | } |
| 5041 | |
| 5042 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 5043 | { |
| 5044 | loff_t n = *pos; |
| 5045 | |
| 5046 | down_read(&slub_lock); |
| 5047 | if (!n) |
| 5048 | print_slabinfo_header(m); |
| 5049 | |
| 5050 | return seq_list_start(&slab_caches, *pos); |
| 5051 | } |
| 5052 | |
| 5053 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) |
| 5054 | { |
| 5055 | return seq_list_next(p, &slab_caches, pos); |
| 5056 | } |
| 5057 | |
| 5058 | static void s_stop(struct seq_file *m, void *p) |
| 5059 | { |
| 5060 | up_read(&slub_lock); |
| 5061 | } |
| 5062 | |
| 5063 | static int s_show(struct seq_file *m, void *p) |
| 5064 | { |
| 5065 | unsigned long nr_partials = 0; |
| 5066 | unsigned long nr_slabs = 0; |
| 5067 | unsigned long nr_inuse = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5068 | unsigned long nr_objs = 0; |
| 5069 | unsigned long nr_free = 0; |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5070 | struct kmem_cache *s; |
| 5071 | int node; |
| 5072 | |
| 5073 | s = list_entry(p, struct kmem_cache, list); |
| 5074 | |
| 5075 | for_each_online_node(node) { |
| 5076 | struct kmem_cache_node *n = get_node(s, node); |
| 5077 | |
| 5078 | if (!n) |
| 5079 | continue; |
| 5080 | |
| 5081 | nr_partials += n->nr_partial; |
| 5082 | nr_slabs += atomic_long_read(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5083 | nr_objs += atomic_long_read(&n->total_objects); |
| 5084 | nr_free += count_partial(n, count_free); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5085 | } |
| 5086 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5087 | nr_inuse = nr_objs - nr_free; |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5088 | |
| 5089 | seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", s->name, nr_inuse, |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 5090 | nr_objs, s->size, oo_objects(s->oo), |
| 5091 | (1 << oo_order(s->oo))); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5092 | seq_printf(m, " : tunables %4u %4u %4u", 0, 0, 0); |
| 5093 | seq_printf(m, " : slabdata %6lu %6lu %6lu", nr_slabs, nr_slabs, |
| 5094 | 0UL); |
| 5095 | seq_putc(m, '\n'); |
| 5096 | return 0; |
| 5097 | } |
| 5098 | |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5099 | static const struct seq_operations slabinfo_op = { |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5100 | .start = s_start, |
| 5101 | .next = s_next, |
| 5102 | .stop = s_stop, |
| 5103 | .show = s_show, |
| 5104 | }; |
| 5105 | |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5106 | static int slabinfo_open(struct inode *inode, struct file *file) |
| 5107 | { |
| 5108 | return seq_open(file, &slabinfo_op); |
| 5109 | } |
| 5110 | |
| 5111 | static const struct file_operations proc_slabinfo_operations = { |
| 5112 | .open = slabinfo_open, |
| 5113 | .read = seq_read, |
| 5114 | .llseek = seq_lseek, |
| 5115 | .release = seq_release, |
| 5116 | }; |
| 5117 | |
| 5118 | static int __init slab_proc_init(void) |
| 5119 | { |
WANG Cong | cf5d113 | 2009-08-18 19:11:40 +0300 | [diff] [blame] | 5120 | proc_create("slabinfo", S_IRUGO, NULL, &proc_slabinfo_operations); |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5121 | return 0; |
| 5122 | } |
| 5123 | module_init(slab_proc_init); |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5124 | #endif /* CONFIG_SLABINFO */ |