Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/slab.c |
| 3 | * Written by Mark Hemment, 1996/97. |
| 4 | * (markhe@nextd.demon.co.uk) |
| 5 | * |
| 6 | * kmem_cache_destroy() + some cleanup - 1999 Andrea Arcangeli |
| 7 | * |
| 8 | * Major cleanup, different bufctl logic, per-cpu arrays |
| 9 | * (c) 2000 Manfred Spraul |
| 10 | * |
| 11 | * Cleanup, make the head arrays unconditional, preparation for NUMA |
| 12 | * (c) 2002 Manfred Spraul |
| 13 | * |
| 14 | * An implementation of the Slab Allocator as described in outline in; |
| 15 | * UNIX Internals: The New Frontiers by Uresh Vahalia |
| 16 | * Pub: Prentice Hall ISBN 0-13-101908-2 |
| 17 | * or with a little more detail in; |
| 18 | * The Slab Allocator: An Object-Caching Kernel Memory Allocator |
| 19 | * Jeff Bonwick (Sun Microsystems). |
| 20 | * Presented at: USENIX Summer 1994 Technical Conference |
| 21 | * |
| 22 | * The memory is organized in caches, one cache for each object type. |
| 23 | * (e.g. inode_cache, dentry_cache, buffer_head, vm_area_struct) |
| 24 | * Each cache consists out of many slabs (they are small (usually one |
| 25 | * page long) and always contiguous), and each slab contains multiple |
| 26 | * initialized objects. |
| 27 | * |
| 28 | * This means, that your constructor is used only for newly allocated |
Simon Arlott | 183ff22 | 2007-10-20 01:27:18 +0200 | [diff] [blame] | 29 | * slabs and you must pass objects with the same initializations to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * kmem_cache_free. |
| 31 | * |
| 32 | * Each cache can only support one memory type (GFP_DMA, GFP_HIGHMEM, |
| 33 | * normal). If you need a special memory type, then must create a new |
| 34 | * cache for that memory type. |
| 35 | * |
| 36 | * In order to reduce fragmentation, the slabs are sorted in 3 groups: |
| 37 | * full slabs with 0 free objects |
| 38 | * partial slabs |
| 39 | * empty slabs with no allocated objects |
| 40 | * |
| 41 | * If partial slabs exist, then new allocations come from these slabs, |
| 42 | * otherwise from empty slabs or new slabs are allocated. |
| 43 | * |
| 44 | * kmem_cache_destroy() CAN CRASH if you try to allocate from the cache |
| 45 | * during kmem_cache_destroy(). The caller must prevent concurrent allocs. |
| 46 | * |
| 47 | * Each cache has a short per-cpu head array, most allocs |
| 48 | * and frees go into that array, and if that array overflows, then 1/2 |
| 49 | * of the entries in the array are given back into the global cache. |
| 50 | * The head array is strictly LIFO and should improve the cache hit rates. |
| 51 | * On SMP, it additionally reduces the spinlock operations. |
| 52 | * |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 53 | * The c_cpuarray may not be read with enabled local interrupts - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | * it's changed with a smp_call_function(). |
| 55 | * |
| 56 | * SMP synchronization: |
| 57 | * constructors and destructors are called without any locking. |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 58 | * Several members in struct kmem_cache and struct slab never change, they |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * are accessed without any locking. |
| 60 | * The per-cpu arrays are never accessed from the wrong cpu, no locking, |
| 61 | * and local interrupts are disabled so slab code is preempt-safe. |
| 62 | * The non-constant members are protected with a per-cache irq spinlock. |
| 63 | * |
| 64 | * Many thanks to Mark Hemment, who wrote another per-cpu slab patch |
| 65 | * in 2000 - many ideas in the current implementation are derived from |
| 66 | * his patch. |
| 67 | * |
| 68 | * Further notes from the original documentation: |
| 69 | * |
| 70 | * 11 April '97. Started multi-threading - markhe |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 71 | * The global cache-chain is protected by the mutex 'cache_chain_mutex'. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | * The sem is only needed when accessing/extending the cache-chain, which |
| 73 | * can never happen inside an interrupt (kmem_cache_create(), |
| 74 | * kmem_cache_shrink() and kmem_cache_reap()). |
| 75 | * |
| 76 | * At present, each engine can be growing a cache. This should be blocked. |
| 77 | * |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 78 | * 15 March 2005. NUMA slab allocator. |
| 79 | * Shai Fultheim <shai@scalex86.org>. |
| 80 | * Shobhit Dayal <shobhit@calsoftinc.com> |
| 81 | * Alok N Kataria <alokk@calsoftinc.com> |
| 82 | * Christoph Lameter <christoph@lameter.com> |
| 83 | * |
| 84 | * Modified the slab allocator to be node aware on NUMA systems. |
| 85 | * Each node has its own list of partial, free and full slabs. |
| 86 | * All object allocations for a node occur from node specific slab lists. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | */ |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #include <linux/slab.h> |
| 90 | #include <linux/mm.h> |
Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 91 | #include <linux/poison.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #include <linux/swap.h> |
| 93 | #include <linux/cache.h> |
| 94 | #include <linux/interrupt.h> |
| 95 | #include <linux/init.h> |
| 96 | #include <linux/compiler.h> |
Paul Jackson | 101a500 | 2006-03-24 03:16:07 -0800 | [diff] [blame] | 97 | #include <linux/cpuset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <linux/seq_file.h> |
| 99 | #include <linux/notifier.h> |
| 100 | #include <linux/kallsyms.h> |
| 101 | #include <linux/cpu.h> |
| 102 | #include <linux/sysctl.h> |
| 103 | #include <linux/module.h> |
| 104 | #include <linux/rcupdate.h> |
Paulo Marques | 543537b | 2005-06-23 00:09:02 -0700 | [diff] [blame] | 105 | #include <linux/string.h> |
Andrew Morton | 138ae66 | 2006-12-06 20:36:41 -0800 | [diff] [blame] | 106 | #include <linux/uaccess.h> |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 107 | #include <linux/nodemask.h> |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 108 | #include <linux/mempolicy.h> |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 109 | #include <linux/mutex.h> |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 110 | #include <linux/fault-inject.h> |
Ingo Molnar | e7eebaf | 2006-06-27 02:54:55 -0700 | [diff] [blame] | 111 | #include <linux/rtmutex.h> |
Eric Dumazet | 6a2d7a9 | 2006-12-13 00:34:27 -0800 | [diff] [blame] | 112 | #include <linux/reciprocal_div.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #include <asm/cacheflush.h> |
| 115 | #include <asm/tlbflush.h> |
| 116 | #include <asm/page.h> |
| 117 | |
| 118 | /* |
Christoph Lameter | 50953fe | 2007-05-06 14:50:16 -0700 | [diff] [blame] | 119 | * DEBUG - 1 for kmem_cache_create() to honour; SLAB_RED_ZONE & SLAB_POISON. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | * 0 for faster, smaller code (especially in the critical paths). |
| 121 | * |
| 122 | * STATS - 1 to collect stats for /proc/slabinfo. |
| 123 | * 0 for faster, smaller code (especially in the critical paths). |
| 124 | * |
| 125 | * FORCED_DEBUG - 1 enables SLAB_RED_ZONE and SLAB_POISON (if possible) |
| 126 | */ |
| 127 | |
| 128 | #ifdef CONFIG_DEBUG_SLAB |
| 129 | #define DEBUG 1 |
| 130 | #define STATS 1 |
| 131 | #define FORCED_DEBUG 1 |
| 132 | #else |
| 133 | #define DEBUG 0 |
| 134 | #define STATS 0 |
| 135 | #define FORCED_DEBUG 0 |
| 136 | #endif |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* Shouldn't this be in a header file somewhere? */ |
| 139 | #define BYTES_PER_WORD sizeof(void *) |
David Woodhouse | 87a927c | 2007-07-04 21:26:44 -0400 | [diff] [blame] | 140 | #define REDZONE_ALIGN max(BYTES_PER_WORD, __alignof__(unsigned long long)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
| 142 | #ifndef cache_line_size |
| 143 | #define cache_line_size() L1_CACHE_BYTES |
| 144 | #endif |
| 145 | |
| 146 | #ifndef ARCH_KMALLOC_MINALIGN |
| 147 | /* |
| 148 | * Enforce a minimum alignment for the kmalloc caches. |
| 149 | * Usually, the kmalloc caches are cache_line_size() aligned, except when |
| 150 | * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned. |
| 151 | * Some archs want to perform DMA into kmalloc caches and need a guaranteed |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 152 | * alignment larger than the alignment of a 64-bit integer. |
| 153 | * ARCH_KMALLOC_MINALIGN allows that. |
| 154 | * Note that increasing this value may disable some debug features. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | */ |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 156 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | #endif |
| 158 | |
| 159 | #ifndef ARCH_SLAB_MINALIGN |
| 160 | /* |
| 161 | * Enforce a minimum alignment for all caches. |
| 162 | * Intended for archs that get misalignment faults even for BYTES_PER_WORD |
| 163 | * aligned buffers. Includes ARCH_KMALLOC_MINALIGN. |
| 164 | * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables |
| 165 | * some debug features. |
| 166 | */ |
| 167 | #define ARCH_SLAB_MINALIGN 0 |
| 168 | #endif |
| 169 | |
| 170 | #ifndef ARCH_KMALLOC_FLAGS |
| 171 | #define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN |
| 172 | #endif |
| 173 | |
| 174 | /* Legal flag mask for kmem_cache_create(). */ |
| 175 | #if DEBUG |
Christoph Lameter | 50953fe | 2007-05-06 14:50:16 -0700 | [diff] [blame] | 176 | # define CREATE_MASK (SLAB_RED_ZONE | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | SLAB_POISON | SLAB_HWCACHE_ALIGN | \ |
Christoph Lameter | ac2b898 | 2006-03-22 00:08:15 -0800 | [diff] [blame] | 178 | SLAB_CACHE_DMA | \ |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 179 | SLAB_STORE_USER | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ |
Paul Jackson | 101a500 | 2006-03-24 03:16:07 -0800 | [diff] [blame] | 181 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | #else |
Christoph Lameter | ac2b898 | 2006-03-22 00:08:15 -0800 | [diff] [blame] | 183 | # define CREATE_MASK (SLAB_HWCACHE_ALIGN | \ |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 184 | SLAB_CACHE_DMA | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ |
Paul Jackson | 101a500 | 2006-03-24 03:16:07 -0800 | [diff] [blame] | 186 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | #endif |
| 188 | |
| 189 | /* |
| 190 | * kmem_bufctl_t: |
| 191 | * |
| 192 | * Bufctl's are used for linking objs within a slab |
| 193 | * linked offsets. |
| 194 | * |
| 195 | * This implementation relies on "struct page" for locating the cache & |
| 196 | * slab an object belongs to. |
| 197 | * This allows the bufctl structure to be small (one int), but limits |
| 198 | * the number of objects a slab (not a cache) can contain when off-slab |
| 199 | * bufctls are used. The limit is the size of the largest general cache |
| 200 | * that does not use off-slab slabs. |
| 201 | * For 32bit archs with 4 kB pages, is this 56. |
| 202 | * This is not serious, as it is only for large objects, when it is unwise |
| 203 | * to have too many per slab. |
| 204 | * Note: This limit can be raised by introducing a general cache whose size |
| 205 | * is less than 512 (PAGE_SIZE<<3), but greater than 256. |
| 206 | */ |
| 207 | |
Kyle Moffett | fa5b08d | 2005-09-03 15:55:03 -0700 | [diff] [blame] | 208 | typedef unsigned int kmem_bufctl_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | #define BUFCTL_END (((kmem_bufctl_t)(~0U))-0) |
| 210 | #define BUFCTL_FREE (((kmem_bufctl_t)(~0U))-1) |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 211 | #define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2) |
| 212 | #define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | /* |
| 215 | * struct slab |
| 216 | * |
| 217 | * Manages the objs in a slab. Placed either at the beginning of mem allocated |
| 218 | * for a slab, or allocated from an general cache. |
| 219 | * Slabs are chained into three list: fully used, partial, fully free slabs. |
| 220 | */ |
| 221 | struct slab { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 222 | struct list_head list; |
| 223 | unsigned long colouroff; |
| 224 | void *s_mem; /* including colour offset */ |
| 225 | unsigned int inuse; /* num of objs active in slab */ |
| 226 | kmem_bufctl_t free; |
| 227 | unsigned short nodeid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | }; |
| 229 | |
| 230 | /* |
| 231 | * struct slab_rcu |
| 232 | * |
| 233 | * slab_destroy on a SLAB_DESTROY_BY_RCU cache uses this structure to |
| 234 | * arrange for kmem_freepages to be called via RCU. This is useful if |
| 235 | * we need to approach a kernel structure obliquely, from its address |
| 236 | * obtained without the usual locking. We can lock the structure to |
| 237 | * stabilize it and check it's still at the given address, only if we |
| 238 | * can be sure that the memory has not been meanwhile reused for some |
| 239 | * other kind of object (which our subsystem's lock might corrupt). |
| 240 | * |
| 241 | * rcu_read_lock before reading the address, then rcu_read_unlock after |
| 242 | * taking the spinlock within the structure expected at that address. |
| 243 | * |
| 244 | * We assume struct slab_rcu can overlay struct slab when destroying. |
| 245 | */ |
| 246 | struct slab_rcu { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 247 | struct rcu_head head; |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 248 | struct kmem_cache *cachep; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 249 | void *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | }; |
| 251 | |
| 252 | /* |
| 253 | * struct array_cache |
| 254 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | * Purpose: |
| 256 | * - LIFO ordering, to hand out cache-warm objects from _alloc |
| 257 | * - reduce the number of linked list operations |
| 258 | * - reduce spinlock operations |
| 259 | * |
| 260 | * The limit is stored in the per-cpu structure to reduce the data cache |
| 261 | * footprint. |
| 262 | * |
| 263 | */ |
| 264 | struct array_cache { |
| 265 | unsigned int avail; |
| 266 | unsigned int limit; |
| 267 | unsigned int batchcount; |
| 268 | unsigned int touched; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 269 | spinlock_t lock; |
Robert P. J. Day | bda5b65 | 2007-10-16 23:30:05 -0700 | [diff] [blame] | 270 | void *entry[]; /* |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 271 | * Must have this definition in here for the proper |
| 272 | * alignment of array_cache. Also simplifies accessing |
| 273 | * the entries. |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 274 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | }; |
| 276 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 277 | /* |
| 278 | * bootstrap: The caches do not work without cpuarrays anymore, but the |
| 279 | * cpuarrays are allocated from the generic caches... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | */ |
| 281 | #define BOOT_CPUCACHE_ENTRIES 1 |
| 282 | struct arraycache_init { |
| 283 | struct array_cache cache; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 284 | void *entries[BOOT_CPUCACHE_ENTRIES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | }; |
| 286 | |
| 287 | /* |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 288 | * The slab lists for all objects. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | */ |
| 290 | struct kmem_list3 { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 291 | struct list_head slabs_partial; /* partial list first, better asm code */ |
| 292 | struct list_head slabs_full; |
| 293 | struct list_head slabs_free; |
| 294 | unsigned long free_objects; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 295 | unsigned int free_limit; |
Ravikiran G Thirumalai | 2e1217c | 2006-02-04 23:27:56 -0800 | [diff] [blame] | 296 | unsigned int colour_next; /* Per-node cache coloring */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 297 | spinlock_t list_lock; |
| 298 | struct array_cache *shared; /* shared per node */ |
| 299 | struct array_cache **alien; /* on other nodes */ |
Christoph Lameter | 35386e3 | 2006-03-22 00:09:05 -0800 | [diff] [blame] | 300 | unsigned long next_reap; /* updated without locking */ |
| 301 | int free_touched; /* updated without locking */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | }; |
| 303 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 304 | /* |
| 305 | * Need this for bootstrapping a per node allocator. |
| 306 | */ |
| 307 | #define NUM_INIT_LISTS (2 * MAX_NUMNODES + 1) |
| 308 | struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS]; |
| 309 | #define CACHE_CACHE 0 |
| 310 | #define SIZE_AC 1 |
| 311 | #define SIZE_L3 (1 + MAX_NUMNODES) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 313 | static int drain_freelist(struct kmem_cache *cache, |
| 314 | struct kmem_list3 *l3, int tofree); |
| 315 | static void free_block(struct kmem_cache *cachep, void **objpp, int len, |
| 316 | int node); |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 317 | static int enable_cpucache(struct kmem_cache *cachep); |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 318 | static void cache_reap(struct work_struct *unused); |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 319 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 320 | /* |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 321 | * This function must be completely optimized away if a constant is passed to |
| 322 | * it. Mostly the same as what is in linux/slab.h except it returns an index. |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 323 | */ |
Ivan Kokshaysky | 7243cc0 | 2005-09-22 21:43:58 -0700 | [diff] [blame] | 324 | static __always_inline int index_of(const size_t size) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 325 | { |
Steven Rostedt | 5ec8a84 | 2006-02-01 03:05:44 -0800 | [diff] [blame] | 326 | extern void __bad_size(void); |
| 327 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 328 | if (__builtin_constant_p(size)) { |
| 329 | int i = 0; |
| 330 | |
| 331 | #define CACHE(x) \ |
| 332 | if (size <=x) \ |
| 333 | return i; \ |
| 334 | else \ |
| 335 | i++; |
| 336 | #include "linux/kmalloc_sizes.h" |
| 337 | #undef CACHE |
Steven Rostedt | 5ec8a84 | 2006-02-01 03:05:44 -0800 | [diff] [blame] | 338 | __bad_size(); |
Ivan Kokshaysky | 7243cc0 | 2005-09-22 21:43:58 -0700 | [diff] [blame] | 339 | } else |
Steven Rostedt | 5ec8a84 | 2006-02-01 03:05:44 -0800 | [diff] [blame] | 340 | __bad_size(); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 341 | return 0; |
| 342 | } |
| 343 | |
Ingo Molnar | e0a4272 | 2006-06-23 02:03:46 -0700 | [diff] [blame] | 344 | static int slab_early_init = 1; |
| 345 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 346 | #define INDEX_AC index_of(sizeof(struct arraycache_init)) |
| 347 | #define INDEX_L3 index_of(sizeof(struct kmem_list3)) |
| 348 | |
Pekka Enberg | 5295a74 | 2006-02-01 03:05:48 -0800 | [diff] [blame] | 349 | static void kmem_list3_init(struct kmem_list3 *parent) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 350 | { |
| 351 | INIT_LIST_HEAD(&parent->slabs_full); |
| 352 | INIT_LIST_HEAD(&parent->slabs_partial); |
| 353 | INIT_LIST_HEAD(&parent->slabs_free); |
| 354 | parent->shared = NULL; |
| 355 | parent->alien = NULL; |
Ravikiran G Thirumalai | 2e1217c | 2006-02-04 23:27:56 -0800 | [diff] [blame] | 356 | parent->colour_next = 0; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 357 | spin_lock_init(&parent->list_lock); |
| 358 | parent->free_objects = 0; |
| 359 | parent->free_touched = 0; |
| 360 | } |
| 361 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 362 | #define MAKE_LIST(cachep, listp, slab, nodeid) \ |
| 363 | do { \ |
| 364 | INIT_LIST_HEAD(listp); \ |
| 365 | list_splice(&(cachep->nodelists[nodeid]->slab), listp); \ |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 366 | } while (0) |
| 367 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 368 | #define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ |
| 369 | do { \ |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 370 | MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid); \ |
| 371 | MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \ |
| 372 | MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \ |
| 373 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | /* |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 376 | * struct kmem_cache |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | * |
| 378 | * manages a cache. |
| 379 | */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 380 | |
Pekka J Enberg | 2109a2d | 2005-11-07 00:58:01 -0800 | [diff] [blame] | 381 | struct kmem_cache { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | /* 1) per-cpu data, touched during every alloc/free */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 383 | struct array_cache *array[NR_CPUS]; |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 384 | /* 2) Cache tunables. Protected by cache_chain_mutex */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 385 | unsigned int batchcount; |
| 386 | unsigned int limit; |
| 387 | unsigned int shared; |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 388 | |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 389 | unsigned int buffer_size; |
Eric Dumazet | 6a2d7a9 | 2006-12-13 00:34:27 -0800 | [diff] [blame] | 390 | u32 reciprocal_buffer_size; |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 391 | /* 3) touched by every alloc & free from the backend */ |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 392 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 393 | unsigned int flags; /* constant flags */ |
| 394 | unsigned int num; /* # of objs per slab */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 396 | /* 4) cache_grow/shrink */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | /* order of pgs per slab (2^n) */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 398 | unsigned int gfporder; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
| 400 | /* force GFP flags, e.g. GFP_DMA */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 401 | gfp_t gfpflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 403 | size_t colour; /* cache colouring range */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 404 | unsigned int colour_off; /* colour offset */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 405 | struct kmem_cache *slabp_cache; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 406 | unsigned int slab_size; |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 407 | unsigned int dflags; /* dynamic flags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
| 409 | /* constructor func */ |
Christoph Lameter | 4ba9b9d | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 410 | void (*ctor)(struct kmem_cache *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 412 | /* 5) cache creation/removal */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 413 | const char *name; |
| 414 | struct list_head next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 416 | /* 6) statistics */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | #if STATS |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 418 | unsigned long num_active; |
| 419 | unsigned long num_allocations; |
| 420 | unsigned long high_mark; |
| 421 | unsigned long grown; |
| 422 | unsigned long reaped; |
| 423 | unsigned long errors; |
| 424 | unsigned long max_freeable; |
| 425 | unsigned long node_allocs; |
| 426 | unsigned long node_frees; |
Ravikiran G Thirumalai | fb7faf3 | 2006-04-10 22:52:54 -0700 | [diff] [blame] | 427 | unsigned long node_overflow; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 428 | atomic_t allochit; |
| 429 | atomic_t allocmiss; |
| 430 | atomic_t freehit; |
| 431 | atomic_t freemiss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | #endif |
| 433 | #if DEBUG |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 434 | /* |
| 435 | * If debugging is enabled, then the allocator can add additional |
| 436 | * fields and/or padding to every object. buffer_size contains the total |
| 437 | * object size including these internal fields, the following two |
| 438 | * variables contain the offset to the user object and its size. |
| 439 | */ |
| 440 | int obj_offset; |
| 441 | int obj_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | #endif |
Eric Dumazet | 8da3430 | 2007-05-06 14:49:29 -0700 | [diff] [blame] | 443 | /* |
| 444 | * We put nodelists[] at the end of kmem_cache, because we want to size |
| 445 | * this array to nr_node_ids slots instead of MAX_NUMNODES |
| 446 | * (see kmem_cache_init()) |
| 447 | * We still use [MAX_NUMNODES] and not [1] or [0] because cache_cache |
| 448 | * is statically defined, so we reserve the max number of nodes. |
| 449 | */ |
| 450 | struct kmem_list3 *nodelists[MAX_NUMNODES]; |
| 451 | /* |
| 452 | * Do not add fields after nodelists[] |
| 453 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | }; |
| 455 | |
| 456 | #define CFLGS_OFF_SLAB (0x80000000UL) |
| 457 | #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) |
| 458 | |
| 459 | #define BATCHREFILL_LIMIT 16 |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 460 | /* |
| 461 | * Optimization question: fewer reaps means less probability for unnessary |
| 462 | * cpucache drain/refill cycles. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | * |
Adrian Bunk | dc6f3f2 | 2005-11-08 16:44:08 +0100 | [diff] [blame] | 464 | * OTOH the cpuarrays can contain lots of objects, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | * which could lock up otherwise freeable slabs. |
| 466 | */ |
| 467 | #define REAPTIMEOUT_CPUC (2*HZ) |
| 468 | #define REAPTIMEOUT_LIST3 (4*HZ) |
| 469 | |
| 470 | #if STATS |
| 471 | #define STATS_INC_ACTIVE(x) ((x)->num_active++) |
| 472 | #define STATS_DEC_ACTIVE(x) ((x)->num_active--) |
| 473 | #define STATS_INC_ALLOCED(x) ((x)->num_allocations++) |
| 474 | #define STATS_INC_GROWN(x) ((x)->grown++) |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 475 | #define STATS_ADD_REAPED(x,y) ((x)->reaped += (y)) |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 476 | #define STATS_SET_HIGH(x) \ |
| 477 | do { \ |
| 478 | if ((x)->num_active > (x)->high_mark) \ |
| 479 | (x)->high_mark = (x)->num_active; \ |
| 480 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | #define STATS_INC_ERR(x) ((x)->errors++) |
| 482 | #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 483 | #define STATS_INC_NODEFREES(x) ((x)->node_frees++) |
Ravikiran G Thirumalai | fb7faf3 | 2006-04-10 22:52:54 -0700 | [diff] [blame] | 484 | #define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++) |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 485 | #define STATS_SET_FREEABLE(x, i) \ |
| 486 | do { \ |
| 487 | if ((x)->max_freeable < i) \ |
| 488 | (x)->max_freeable = i; \ |
| 489 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | #define STATS_INC_ALLOCHIT(x) atomic_inc(&(x)->allochit) |
| 491 | #define STATS_INC_ALLOCMISS(x) atomic_inc(&(x)->allocmiss) |
| 492 | #define STATS_INC_FREEHIT(x) atomic_inc(&(x)->freehit) |
| 493 | #define STATS_INC_FREEMISS(x) atomic_inc(&(x)->freemiss) |
| 494 | #else |
| 495 | #define STATS_INC_ACTIVE(x) do { } while (0) |
| 496 | #define STATS_DEC_ACTIVE(x) do { } while (0) |
| 497 | #define STATS_INC_ALLOCED(x) do { } while (0) |
| 498 | #define STATS_INC_GROWN(x) do { } while (0) |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 499 | #define STATS_ADD_REAPED(x,y) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | #define STATS_SET_HIGH(x) do { } while (0) |
| 501 | #define STATS_INC_ERR(x) do { } while (0) |
| 502 | #define STATS_INC_NODEALLOCS(x) do { } while (0) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 503 | #define STATS_INC_NODEFREES(x) do { } while (0) |
Ravikiran G Thirumalai | fb7faf3 | 2006-04-10 22:52:54 -0700 | [diff] [blame] | 504 | #define STATS_INC_ACOVERFLOW(x) do { } while (0) |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 505 | #define STATS_SET_FREEABLE(x, i) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | #define STATS_INC_ALLOCHIT(x) do { } while (0) |
| 507 | #define STATS_INC_ALLOCMISS(x) do { } while (0) |
| 508 | #define STATS_INC_FREEHIT(x) do { } while (0) |
| 509 | #define STATS_INC_FREEMISS(x) do { } while (0) |
| 510 | #endif |
| 511 | |
| 512 | #if DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 514 | /* |
| 515 | * memory layout of objects: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | * 0 : objp |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 517 | * 0 .. cachep->obj_offset - BYTES_PER_WORD - 1: padding. This ensures that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | * the end of an object is aligned with the end of the real |
| 519 | * allocation. Catches writes behind the end of the allocation. |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 520 | * cachep->obj_offset - BYTES_PER_WORD .. cachep->obj_offset - 1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | * redzone word. |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 522 | * cachep->obj_offset: The real object. |
| 523 | * cachep->buffer_size - 2* BYTES_PER_WORD: redzone word [BYTES_PER_WORD long] |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 524 | * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address |
| 525 | * [BYTES_PER_WORD long] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 527 | static int obj_offset(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 529 | return cachep->obj_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
| 531 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 532 | static int obj_size(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | { |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 534 | return cachep->obj_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 537 | static unsigned long long *dbg_redzone1(struct kmem_cache *cachep, void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { |
| 539 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 540 | return (unsigned long long*) (objp + obj_offset(cachep) - |
| 541 | sizeof(unsigned long long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | } |
| 543 | |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 544 | static unsigned long long *dbg_redzone2(struct kmem_cache *cachep, void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | { |
| 546 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); |
| 547 | if (cachep->flags & SLAB_STORE_USER) |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 548 | return (unsigned long long *)(objp + cachep->buffer_size - |
| 549 | sizeof(unsigned long long) - |
David Woodhouse | 87a927c | 2007-07-04 21:26:44 -0400 | [diff] [blame] | 550 | REDZONE_ALIGN); |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 551 | return (unsigned long long *) (objp + cachep->buffer_size - |
| 552 | sizeof(unsigned long long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | } |
| 554 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 555 | static void **dbg_userword(struct kmem_cache *cachep, void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | { |
| 557 | BUG_ON(!(cachep->flags & SLAB_STORE_USER)); |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 558 | return (void **)(objp + cachep->buffer_size - BYTES_PER_WORD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | #else |
| 562 | |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 563 | #define obj_offset(x) 0 |
| 564 | #define obj_size(cachep) (cachep->buffer_size) |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 565 | #define dbg_redzone1(cachep, objp) ({BUG(); (unsigned long long *)NULL;}) |
| 566 | #define dbg_redzone2(cachep, objp) ({BUG(); (unsigned long long *)NULL;}) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | #define dbg_userword(cachep, objp) ({BUG(); (void **)NULL;}) |
| 568 | |
| 569 | #endif |
| 570 | |
| 571 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | * Do not go above this order unless 0 objects fit into the slab. |
| 573 | */ |
| 574 | #define BREAK_GFP_ORDER_HI 1 |
| 575 | #define BREAK_GFP_ORDER_LO 0 |
| 576 | static int slab_break_gfp_order = BREAK_GFP_ORDER_LO; |
| 577 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 578 | /* |
| 579 | * Functions for storing/retrieving the cachep and or slab from the page |
| 580 | * allocator. These are used to find the slab an obj belongs to. With kfree(), |
| 581 | * these are used to find the cache which an obj belongs to. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | */ |
Pekka Enberg | 065d41c | 2005-11-13 16:06:46 -0800 | [diff] [blame] | 583 | static inline void page_set_cache(struct page *page, struct kmem_cache *cache) |
| 584 | { |
| 585 | page->lru.next = (struct list_head *)cache; |
| 586 | } |
| 587 | |
| 588 | static inline struct kmem_cache *page_get_cache(struct page *page) |
| 589 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 590 | page = compound_head(page); |
Pekka Enberg | ddc2e81 | 2006-06-23 02:03:40 -0700 | [diff] [blame] | 591 | BUG_ON(!PageSlab(page)); |
Pekka Enberg | 065d41c | 2005-11-13 16:06:46 -0800 | [diff] [blame] | 592 | return (struct kmem_cache *)page->lru.next; |
| 593 | } |
| 594 | |
| 595 | static inline void page_set_slab(struct page *page, struct slab *slab) |
| 596 | { |
| 597 | page->lru.prev = (struct list_head *)slab; |
| 598 | } |
| 599 | |
| 600 | static inline struct slab *page_get_slab(struct page *page) |
| 601 | { |
Pekka Enberg | ddc2e81 | 2006-06-23 02:03:40 -0700 | [diff] [blame] | 602 | BUG_ON(!PageSlab(page)); |
Pekka Enberg | 065d41c | 2005-11-13 16:06:46 -0800 | [diff] [blame] | 603 | return (struct slab *)page->lru.prev; |
| 604 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Pekka Enberg | 6ed5eb221 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 606 | static inline struct kmem_cache *virt_to_cache(const void *obj) |
| 607 | { |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 608 | struct page *page = virt_to_head_page(obj); |
Pekka Enberg | 6ed5eb221 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 609 | return page_get_cache(page); |
| 610 | } |
| 611 | |
| 612 | static inline struct slab *virt_to_slab(const void *obj) |
| 613 | { |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 614 | struct page *page = virt_to_head_page(obj); |
Pekka Enberg | 6ed5eb221 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 615 | return page_get_slab(page); |
| 616 | } |
| 617 | |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 618 | static inline void *index_to_obj(struct kmem_cache *cache, struct slab *slab, |
| 619 | unsigned int idx) |
| 620 | { |
| 621 | return slab->s_mem + cache->buffer_size * idx; |
| 622 | } |
| 623 | |
Eric Dumazet | 6a2d7a9 | 2006-12-13 00:34:27 -0800 | [diff] [blame] | 624 | /* |
| 625 | * We want to avoid an expensive divide : (offset / cache->buffer_size) |
| 626 | * Using the fact that buffer_size is a constant for a particular cache, |
| 627 | * we can replace (offset / cache->buffer_size) by |
| 628 | * reciprocal_divide(offset, cache->reciprocal_buffer_size) |
| 629 | */ |
| 630 | static inline unsigned int obj_to_index(const struct kmem_cache *cache, |
| 631 | const struct slab *slab, void *obj) |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 632 | { |
Eric Dumazet | 6a2d7a9 | 2006-12-13 00:34:27 -0800 | [diff] [blame] | 633 | u32 offset = (obj - slab->s_mem); |
| 634 | return reciprocal_divide(offset, cache->reciprocal_buffer_size); |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 635 | } |
| 636 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 637 | /* |
| 638 | * These are the default caches for kmalloc. Custom caches can have other sizes. |
| 639 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | struct cache_sizes malloc_sizes[] = { |
| 641 | #define CACHE(x) { .cs_size = (x) }, |
| 642 | #include <linux/kmalloc_sizes.h> |
| 643 | CACHE(ULONG_MAX) |
| 644 | #undef CACHE |
| 645 | }; |
| 646 | EXPORT_SYMBOL(malloc_sizes); |
| 647 | |
| 648 | /* Must match cache_sizes above. Out of line to keep cache footprint low. */ |
| 649 | struct cache_names { |
| 650 | char *name; |
| 651 | char *name_dma; |
| 652 | }; |
| 653 | |
| 654 | static struct cache_names __initdata cache_names[] = { |
| 655 | #define CACHE(x) { .name = "size-" #x, .name_dma = "size-" #x "(DMA)" }, |
| 656 | #include <linux/kmalloc_sizes.h> |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 657 | {NULL,} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | #undef CACHE |
| 659 | }; |
| 660 | |
| 661 | static struct arraycache_init initarray_cache __initdata = |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 662 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | static struct arraycache_init initarray_generic = |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 664 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
| 666 | /* internal cache of cache description objs */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 667 | static struct kmem_cache cache_cache = { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 668 | .batchcount = 1, |
| 669 | .limit = BOOT_CPUCACHE_ENTRIES, |
| 670 | .shared = 1, |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 671 | .buffer_size = sizeof(struct kmem_cache), |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 672 | .name = "kmem_cache", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | }; |
| 674 | |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 675 | #define BAD_ALIEN_MAGIC 0x01020304ul |
| 676 | |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 677 | #ifdef CONFIG_LOCKDEP |
| 678 | |
| 679 | /* |
| 680 | * Slab sometimes uses the kmalloc slabs to store the slab headers |
| 681 | * for other slabs "off slab". |
| 682 | * The locking for this is tricky in that it nests within the locks |
| 683 | * of all other slabs in a few places; to deal with this special |
| 684 | * locking we put on-slab caches into a separate lock-class. |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 685 | * |
| 686 | * We set lock class for alien array caches which are up during init. |
| 687 | * The lock annotation will be lost if all cpus of a node goes down and |
| 688 | * then comes back up during hotplug |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 689 | */ |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 690 | static struct lock_class_key on_slab_l3_key; |
| 691 | static struct lock_class_key on_slab_alc_key; |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 692 | |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 693 | static inline void init_lock_keys(void) |
| 694 | |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 695 | { |
| 696 | int q; |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 697 | struct cache_sizes *s = malloc_sizes; |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 698 | |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 699 | while (s->cs_size != ULONG_MAX) { |
| 700 | for_each_node(q) { |
| 701 | struct array_cache **alc; |
| 702 | int r; |
| 703 | struct kmem_list3 *l3 = s->cs_cachep->nodelists[q]; |
| 704 | if (!l3 || OFF_SLAB(s->cs_cachep)) |
| 705 | continue; |
| 706 | lockdep_set_class(&l3->list_lock, &on_slab_l3_key); |
| 707 | alc = l3->alien; |
| 708 | /* |
| 709 | * FIXME: This check for BAD_ALIEN_MAGIC |
| 710 | * should go away when common slab code is taught to |
| 711 | * work even without alien caches. |
| 712 | * Currently, non NUMA code returns BAD_ALIEN_MAGIC |
| 713 | * for alloc_alien_cache, |
| 714 | */ |
| 715 | if (!alc || (unsigned long)alc == BAD_ALIEN_MAGIC) |
| 716 | continue; |
| 717 | for_each_node(r) { |
| 718 | if (alc[r]) |
| 719 | lockdep_set_class(&alc[r]->lock, |
| 720 | &on_slab_alc_key); |
| 721 | } |
| 722 | } |
| 723 | s++; |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 724 | } |
| 725 | } |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 726 | #else |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 727 | static inline void init_lock_keys(void) |
Arjan van de Ven | f1aaee5 | 2006-07-13 14:46:03 +0200 | [diff] [blame] | 728 | { |
| 729 | } |
| 730 | #endif |
| 731 | |
Ravikiran G Thirumalai | 8f5be20 | 2006-12-06 20:32:14 -0800 | [diff] [blame] | 732 | /* |
| 733 | * 1. Guard access to the cache-chain. |
| 734 | * 2. Protect sanity of cpu_online_map against cpu hotplug events |
| 735 | */ |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 736 | static DEFINE_MUTEX(cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | static struct list_head cache_chain; |
| 738 | |
| 739 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | * chicken and egg problem: delay the per-cpu array allocation |
| 741 | * until the general caches are up. |
| 742 | */ |
| 743 | static enum { |
| 744 | NONE, |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 745 | PARTIAL_AC, |
| 746 | PARTIAL_L3, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | FULL |
| 748 | } g_cpucache_up; |
| 749 | |
Mike Kravetz | 39d24e6 | 2006-05-15 09:44:13 -0700 | [diff] [blame] | 750 | /* |
| 751 | * used by boot code to determine if it can use slab based allocator |
| 752 | */ |
| 753 | int slab_is_available(void) |
| 754 | { |
| 755 | return g_cpucache_up == FULL; |
| 756 | } |
| 757 | |
David Howells | 52bad64 | 2006-11-22 14:54:01 +0000 | [diff] [blame] | 758 | static DEFINE_PER_CPU(struct delayed_work, reap_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 760 | static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | { |
| 762 | return cachep->array[smp_processor_id()]; |
| 763 | } |
| 764 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 765 | static inline struct kmem_cache *__find_general_cachep(size_t size, |
| 766 | gfp_t gfpflags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | { |
| 768 | struct cache_sizes *csizep = malloc_sizes; |
| 769 | |
| 770 | #if DEBUG |
| 771 | /* This happens if someone tries to call |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 772 | * kmem_cache_create(), or __kmalloc(), before |
| 773 | * the generic caches are initialized. |
| 774 | */ |
Alok Kataria | c7e43c7 | 2005-09-14 12:17:53 -0700 | [diff] [blame] | 775 | BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | #endif |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 777 | if (!size) |
| 778 | return ZERO_SIZE_PTR; |
| 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | while (size > csizep->cs_size) |
| 781 | csizep++; |
| 782 | |
| 783 | /* |
Martin Hicks | 0abf40c | 2005-09-03 15:54:54 -0700 | [diff] [blame] | 784 | * Really subtle: The last entry with cs->cs_size==ULONG_MAX |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | * has cs_{dma,}cachep==NULL. Thus no special case |
| 786 | * for large kmalloc calls required. |
| 787 | */ |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 788 | #ifdef CONFIG_ZONE_DMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | if (unlikely(gfpflags & GFP_DMA)) |
| 790 | return csizep->cs_dmacachep; |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 791 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | return csizep->cs_cachep; |
| 793 | } |
| 794 | |
Adrian Bunk | b221385 | 2006-09-25 23:31:02 -0700 | [diff] [blame] | 795 | static struct kmem_cache *kmem_find_general_cachep(size_t size, gfp_t gfpflags) |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 796 | { |
| 797 | return __find_general_cachep(size, gfpflags); |
| 798 | } |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 799 | |
Steven Rostedt | fbaccac | 2006-02-01 03:05:45 -0800 | [diff] [blame] | 800 | static size_t slab_mgmt_size(size_t nr_objs, size_t align) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | { |
Steven Rostedt | fbaccac | 2006-02-01 03:05:45 -0800 | [diff] [blame] | 802 | return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align); |
| 803 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 805 | /* |
| 806 | * Calculate the number of objects and left-over bytes for a given buffer size. |
| 807 | */ |
Steven Rostedt | fbaccac | 2006-02-01 03:05:45 -0800 | [diff] [blame] | 808 | static void cache_estimate(unsigned long gfporder, size_t buffer_size, |
| 809 | size_t align, int flags, size_t *left_over, |
| 810 | unsigned int *num) |
| 811 | { |
| 812 | int nr_objs; |
| 813 | size_t mgmt_size; |
| 814 | size_t slab_size = PAGE_SIZE << gfporder; |
| 815 | |
| 816 | /* |
| 817 | * The slab management structure can be either off the slab or |
| 818 | * on it. For the latter case, the memory allocated for a |
| 819 | * slab is used for: |
| 820 | * |
| 821 | * - The struct slab |
| 822 | * - One kmem_bufctl_t for each object |
| 823 | * - Padding to respect alignment of @align |
| 824 | * - @buffer_size bytes for each object |
| 825 | * |
| 826 | * If the slab management structure is off the slab, then the |
| 827 | * alignment will already be calculated into the size. Because |
| 828 | * the slabs are all pages aligned, the objects will be at the |
| 829 | * correct alignment when allocated. |
| 830 | */ |
| 831 | if (flags & CFLGS_OFF_SLAB) { |
| 832 | mgmt_size = 0; |
| 833 | nr_objs = slab_size / buffer_size; |
| 834 | |
| 835 | if (nr_objs > SLAB_LIMIT) |
| 836 | nr_objs = SLAB_LIMIT; |
| 837 | } else { |
| 838 | /* |
| 839 | * Ignore padding for the initial guess. The padding |
| 840 | * is at most @align-1 bytes, and @buffer_size is at |
| 841 | * least @align. In the worst case, this result will |
| 842 | * be one greater than the number of objects that fit |
| 843 | * into the memory allocation when taking the padding |
| 844 | * into account. |
| 845 | */ |
| 846 | nr_objs = (slab_size - sizeof(struct slab)) / |
| 847 | (buffer_size + sizeof(kmem_bufctl_t)); |
| 848 | |
| 849 | /* |
| 850 | * This calculated number will be either the right |
| 851 | * amount, or one greater than what we want. |
| 852 | */ |
| 853 | if (slab_mgmt_size(nr_objs, align) + nr_objs*buffer_size |
| 854 | > slab_size) |
| 855 | nr_objs--; |
| 856 | |
| 857 | if (nr_objs > SLAB_LIMIT) |
| 858 | nr_objs = SLAB_LIMIT; |
| 859 | |
| 860 | mgmt_size = slab_mgmt_size(nr_objs, align); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
Steven Rostedt | fbaccac | 2006-02-01 03:05:45 -0800 | [diff] [blame] | 862 | *num = nr_objs; |
| 863 | *left_over = slab_size - nr_objs*buffer_size - mgmt_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | #define slab_error(cachep, msg) __slab_error(__FUNCTION__, cachep, msg) |
| 867 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 868 | static void __slab_error(const char *function, struct kmem_cache *cachep, |
| 869 | char *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | { |
| 871 | printk(KERN_ERR "slab error in %s(): cache `%s': %s\n", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 872 | function, cachep->name, msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | dump_stack(); |
| 874 | } |
| 875 | |
Paul Menage | 3395ee0 | 2006-12-06 20:32:16 -0800 | [diff] [blame] | 876 | /* |
| 877 | * By default on NUMA we use alien caches to stage the freeing of |
| 878 | * objects allocated from other nodes. This causes massive memory |
| 879 | * inefficiencies when using fake NUMA setup to split memory into a |
| 880 | * large number of small nodes, so it can be disabled on the command |
| 881 | * line |
| 882 | */ |
| 883 | |
| 884 | static int use_alien_caches __read_mostly = 1; |
Siddha, Suresh B | 1807a1a | 2007-08-22 14:01:49 -0700 | [diff] [blame] | 885 | static int numa_platform __read_mostly = 1; |
Paul Menage | 3395ee0 | 2006-12-06 20:32:16 -0800 | [diff] [blame] | 886 | static int __init noaliencache_setup(char *s) |
| 887 | { |
| 888 | use_alien_caches = 0; |
| 889 | return 1; |
| 890 | } |
| 891 | __setup("noaliencache", noaliencache_setup); |
| 892 | |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 893 | #ifdef CONFIG_NUMA |
| 894 | /* |
| 895 | * Special reaping functions for NUMA systems called from cache_reap(). |
| 896 | * These take care of doing round robin flushing of alien caches (containing |
| 897 | * objects freed on different nodes from which they were allocated) and the |
| 898 | * flushing of remote pcps by calling drain_node_pages. |
| 899 | */ |
| 900 | static DEFINE_PER_CPU(unsigned long, reap_node); |
| 901 | |
| 902 | static void init_reap_node(int cpu) |
| 903 | { |
| 904 | int node; |
| 905 | |
| 906 | node = next_node(cpu_to_node(cpu), node_online_map); |
| 907 | if (node == MAX_NUMNODES) |
Paul Jackson | 442295c | 2006-03-22 00:09:11 -0800 | [diff] [blame] | 908 | node = first_node(node_online_map); |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 909 | |
Daniel Yeisley | 7f6b887 | 2006-11-02 22:07:14 -0800 | [diff] [blame] | 910 | per_cpu(reap_node, cpu) = node; |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | static void next_reap_node(void) |
| 914 | { |
| 915 | int node = __get_cpu_var(reap_node); |
| 916 | |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 917 | node = next_node(node, node_online_map); |
| 918 | if (unlikely(node >= MAX_NUMNODES)) |
| 919 | node = first_node(node_online_map); |
| 920 | __get_cpu_var(reap_node) = node; |
| 921 | } |
| 922 | |
| 923 | #else |
| 924 | #define init_reap_node(cpu) do { } while (0) |
| 925 | #define next_reap_node(void) do { } while (0) |
| 926 | #endif |
| 927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | /* |
| 929 | * Initiate the reap timer running on the target CPU. We run at around 1 to 2Hz |
| 930 | * via the workqueue/eventd. |
| 931 | * Add the CPU number into the expiration time to minimize the possibility of |
| 932 | * the CPUs getting into lockstep and contending for the global cache chain |
| 933 | * lock. |
| 934 | */ |
Adrian Bunk | 897e679 | 2007-07-15 23:38:20 -0700 | [diff] [blame] | 935 | static void __cpuinit start_cpu_timer(int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | { |
David Howells | 52bad64 | 2006-11-22 14:54:01 +0000 | [diff] [blame] | 937 | struct delayed_work *reap_work = &per_cpu(reap_work, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
| 939 | /* |
| 940 | * When this gets called from do_initcalls via cpucache_init(), |
| 941 | * init_workqueues() has already run, so keventd will be setup |
| 942 | * at that time. |
| 943 | */ |
David Howells | 52bad64 | 2006-11-22 14:54:01 +0000 | [diff] [blame] | 944 | if (keventd_up() && reap_work->work.func == NULL) { |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 945 | init_reap_node(cpu); |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 946 | INIT_DELAYED_WORK(reap_work, cache_reap); |
Arjan van de Ven | 2b28421 | 2006-12-10 02:21:28 -0800 | [diff] [blame] | 947 | schedule_delayed_work_on(cpu, reap_work, |
| 948 | __round_jiffies_relative(HZ, cpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | } |
| 950 | } |
| 951 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 952 | static struct array_cache *alloc_arraycache(int node, int entries, |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 953 | int batchcount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 955 | int memsize = sizeof(void *) * entries + sizeof(struct array_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | struct array_cache *nc = NULL; |
| 957 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 958 | nc = kmalloc_node(memsize, GFP_KERNEL, node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | if (nc) { |
| 960 | nc->avail = 0; |
| 961 | nc->limit = entries; |
| 962 | nc->batchcount = batchcount; |
| 963 | nc->touched = 0; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 964 | spin_lock_init(&nc->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | } |
| 966 | return nc; |
| 967 | } |
| 968 | |
Christoph Lameter | 3ded175 | 2006-03-25 03:06:44 -0800 | [diff] [blame] | 969 | /* |
| 970 | * Transfer objects in one arraycache to another. |
| 971 | * Locking must be handled by the caller. |
| 972 | * |
| 973 | * Return the number of entries transferred. |
| 974 | */ |
| 975 | static int transfer_objects(struct array_cache *to, |
| 976 | struct array_cache *from, unsigned int max) |
| 977 | { |
| 978 | /* Figure out how many entries to transfer */ |
| 979 | int nr = min(min(from->avail, max), to->limit - to->avail); |
| 980 | |
| 981 | if (!nr) |
| 982 | return 0; |
| 983 | |
| 984 | memcpy(to->entry + to->avail, from->entry + from->avail -nr, |
| 985 | sizeof(void *) *nr); |
| 986 | |
| 987 | from->avail -= nr; |
| 988 | to->avail += nr; |
| 989 | to->touched = 1; |
| 990 | return nr; |
| 991 | } |
| 992 | |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 993 | #ifndef CONFIG_NUMA |
| 994 | |
| 995 | #define drain_alien_cache(cachep, alien) do { } while (0) |
| 996 | #define reap_alien(cachep, l3) do { } while (0) |
| 997 | |
| 998 | static inline struct array_cache **alloc_alien_cache(int node, int limit) |
| 999 | { |
| 1000 | return (struct array_cache **)BAD_ALIEN_MAGIC; |
| 1001 | } |
| 1002 | |
| 1003 | static inline void free_alien_cache(struct array_cache **ac_ptr) |
| 1004 | { |
| 1005 | } |
| 1006 | |
| 1007 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) |
| 1008 | { |
| 1009 | return 0; |
| 1010 | } |
| 1011 | |
| 1012 | static inline void *alternate_node_alloc(struct kmem_cache *cachep, |
| 1013 | gfp_t flags) |
| 1014 | { |
| 1015 | return NULL; |
| 1016 | } |
| 1017 | |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 1018 | static inline void *____cache_alloc_node(struct kmem_cache *cachep, |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 1019 | gfp_t flags, int nodeid) |
| 1020 | { |
| 1021 | return NULL; |
| 1022 | } |
| 1023 | |
| 1024 | #else /* CONFIG_NUMA */ |
| 1025 | |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 1026 | static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int); |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 1027 | static void *alternate_node_alloc(struct kmem_cache *, gfp_t); |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1028 | |
Pekka Enberg | 5295a74 | 2006-02-01 03:05:48 -0800 | [diff] [blame] | 1029 | static struct array_cache **alloc_alien_cache(int node, int limit) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1030 | { |
| 1031 | struct array_cache **ac_ptr; |
Christoph Lameter | 8ef8286 | 2007-02-20 13:57:52 -0800 | [diff] [blame] | 1032 | int memsize = sizeof(void *) * nr_node_ids; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1033 | int i; |
| 1034 | |
| 1035 | if (limit > 1) |
| 1036 | limit = 12; |
| 1037 | ac_ptr = kmalloc_node(memsize, GFP_KERNEL, node); |
| 1038 | if (ac_ptr) { |
| 1039 | for_each_node(i) { |
| 1040 | if (i == node || !node_online(i)) { |
| 1041 | ac_ptr[i] = NULL; |
| 1042 | continue; |
| 1043 | } |
| 1044 | ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d); |
| 1045 | if (!ac_ptr[i]) { |
Akinobu Mita | cc550de | 2007-11-14 16:58:35 -0800 | [diff] [blame] | 1046 | for (i--; i >= 0; i--) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1047 | kfree(ac_ptr[i]); |
| 1048 | kfree(ac_ptr); |
| 1049 | return NULL; |
| 1050 | } |
| 1051 | } |
| 1052 | } |
| 1053 | return ac_ptr; |
| 1054 | } |
| 1055 | |
Pekka Enberg | 5295a74 | 2006-02-01 03:05:48 -0800 | [diff] [blame] | 1056 | static void free_alien_cache(struct array_cache **ac_ptr) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1057 | { |
| 1058 | int i; |
| 1059 | |
| 1060 | if (!ac_ptr) |
| 1061 | return; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1062 | for_each_node(i) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1063 | kfree(ac_ptr[i]); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1064 | kfree(ac_ptr); |
| 1065 | } |
| 1066 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1067 | static void __drain_alien_cache(struct kmem_cache *cachep, |
Pekka Enberg | 5295a74 | 2006-02-01 03:05:48 -0800 | [diff] [blame] | 1068 | struct array_cache *ac, int node) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1069 | { |
| 1070 | struct kmem_list3 *rl3 = cachep->nodelists[node]; |
| 1071 | |
| 1072 | if (ac->avail) { |
| 1073 | spin_lock(&rl3->list_lock); |
Christoph Lameter | e00946f | 2006-03-25 03:06:45 -0800 | [diff] [blame] | 1074 | /* |
| 1075 | * Stuff objects into the remote nodes shared array first. |
| 1076 | * That way we could avoid the overhead of putting the objects |
| 1077 | * into the free lists and getting them back later. |
| 1078 | */ |
shin, jacob | 693f7d3 | 2006-04-28 10:54:37 -0500 | [diff] [blame] | 1079 | if (rl3->shared) |
| 1080 | transfer_objects(rl3->shared, ac, ac->limit); |
Christoph Lameter | e00946f | 2006-03-25 03:06:45 -0800 | [diff] [blame] | 1081 | |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 1082 | free_block(cachep, ac->entry, ac->avail, node); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1083 | ac->avail = 0; |
| 1084 | spin_unlock(&rl3->list_lock); |
| 1085 | } |
| 1086 | } |
| 1087 | |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 1088 | /* |
| 1089 | * Called from cache_reap() to regularly drain alien caches round robin. |
| 1090 | */ |
| 1091 | static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3) |
| 1092 | { |
| 1093 | int node = __get_cpu_var(reap_node); |
| 1094 | |
| 1095 | if (l3->alien) { |
| 1096 | struct array_cache *ac = l3->alien[node]; |
Christoph Lameter | e00946f | 2006-03-25 03:06:45 -0800 | [diff] [blame] | 1097 | |
| 1098 | if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 1099 | __drain_alien_cache(cachep, ac, node); |
| 1100 | spin_unlock_irq(&ac->lock); |
| 1101 | } |
| 1102 | } |
| 1103 | } |
| 1104 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1105 | static void drain_alien_cache(struct kmem_cache *cachep, |
| 1106 | struct array_cache **alien) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1107 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1108 | int i = 0; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1109 | struct array_cache *ac; |
| 1110 | unsigned long flags; |
| 1111 | |
| 1112 | for_each_online_node(i) { |
Ravikiran G Thirumalai | 4484ebf | 2006-02-04 23:27:59 -0800 | [diff] [blame] | 1113 | ac = alien[i]; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1114 | if (ac) { |
| 1115 | spin_lock_irqsave(&ac->lock, flags); |
| 1116 | __drain_alien_cache(cachep, ac, i); |
| 1117 | spin_unlock_irqrestore(&ac->lock, flags); |
| 1118 | } |
| 1119 | } |
| 1120 | } |
Pekka Enberg | 729bd0b | 2006-06-23 02:03:05 -0700 | [diff] [blame] | 1121 | |
Ingo Molnar | 873623d | 2006-07-13 14:44:38 +0200 | [diff] [blame] | 1122 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) |
Pekka Enberg | 729bd0b | 2006-06-23 02:03:05 -0700 | [diff] [blame] | 1123 | { |
| 1124 | struct slab *slabp = virt_to_slab(objp); |
| 1125 | int nodeid = slabp->nodeid; |
| 1126 | struct kmem_list3 *l3; |
| 1127 | struct array_cache *alien = NULL; |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1128 | int node; |
| 1129 | |
| 1130 | node = numa_node_id(); |
Pekka Enberg | 729bd0b | 2006-06-23 02:03:05 -0700 | [diff] [blame] | 1131 | |
| 1132 | /* |
| 1133 | * Make sure we are not freeing a object from another node to the array |
| 1134 | * cache on this cpu. |
| 1135 | */ |
Siddha, Suresh B | 62918a0 | 2007-05-02 19:27:18 +0200 | [diff] [blame] | 1136 | if (likely(slabp->nodeid == node)) |
Pekka Enberg | 729bd0b | 2006-06-23 02:03:05 -0700 | [diff] [blame] | 1137 | return 0; |
| 1138 | |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1139 | l3 = cachep->nodelists[node]; |
Pekka Enberg | 729bd0b | 2006-06-23 02:03:05 -0700 | [diff] [blame] | 1140 | STATS_INC_NODEFREES(cachep); |
| 1141 | if (l3->alien && l3->alien[nodeid]) { |
| 1142 | alien = l3->alien[nodeid]; |
Ingo Molnar | 873623d | 2006-07-13 14:44:38 +0200 | [diff] [blame] | 1143 | spin_lock(&alien->lock); |
Pekka Enberg | 729bd0b | 2006-06-23 02:03:05 -0700 | [diff] [blame] | 1144 | if (unlikely(alien->avail == alien->limit)) { |
| 1145 | STATS_INC_ACOVERFLOW(cachep); |
| 1146 | __drain_alien_cache(cachep, alien, nodeid); |
| 1147 | } |
| 1148 | alien->entry[alien->avail++] = objp; |
| 1149 | spin_unlock(&alien->lock); |
| 1150 | } else { |
| 1151 | spin_lock(&(cachep->nodelists[nodeid])->list_lock); |
| 1152 | free_block(cachep, &objp, 1, nodeid); |
| 1153 | spin_unlock(&(cachep->nodelists[nodeid])->list_lock); |
| 1154 | } |
| 1155 | return 1; |
| 1156 | } |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1157 | #endif |
| 1158 | |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1159 | static void __cpuinit cpuup_canceled(long cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | { |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1161 | struct kmem_cache *cachep; |
| 1162 | struct kmem_list3 *l3 = NULL; |
| 1163 | int node = cpu_to_node(cpu); |
| 1164 | |
| 1165 | list_for_each_entry(cachep, &cache_chain, next) { |
| 1166 | struct array_cache *nc; |
| 1167 | struct array_cache *shared; |
| 1168 | struct array_cache **alien; |
| 1169 | cpumask_t mask; |
| 1170 | |
| 1171 | mask = node_to_cpumask(node); |
| 1172 | /* cpu is dead; no one can alloc from it. */ |
| 1173 | nc = cachep->array[cpu]; |
| 1174 | cachep->array[cpu] = NULL; |
| 1175 | l3 = cachep->nodelists[node]; |
| 1176 | |
| 1177 | if (!l3) |
| 1178 | goto free_array_cache; |
| 1179 | |
| 1180 | spin_lock_irq(&l3->list_lock); |
| 1181 | |
| 1182 | /* Free limit for this kmem_list3 */ |
| 1183 | l3->free_limit -= cachep->batchcount; |
| 1184 | if (nc) |
| 1185 | free_block(cachep, nc->entry, nc->avail, node); |
| 1186 | |
| 1187 | if (!cpus_empty(mask)) { |
| 1188 | spin_unlock_irq(&l3->list_lock); |
| 1189 | goto free_array_cache; |
| 1190 | } |
| 1191 | |
| 1192 | shared = l3->shared; |
| 1193 | if (shared) { |
| 1194 | free_block(cachep, shared->entry, |
| 1195 | shared->avail, node); |
| 1196 | l3->shared = NULL; |
| 1197 | } |
| 1198 | |
| 1199 | alien = l3->alien; |
| 1200 | l3->alien = NULL; |
| 1201 | |
| 1202 | spin_unlock_irq(&l3->list_lock); |
| 1203 | |
| 1204 | kfree(shared); |
| 1205 | if (alien) { |
| 1206 | drain_alien_cache(cachep, alien); |
| 1207 | free_alien_cache(alien); |
| 1208 | } |
| 1209 | free_array_cache: |
| 1210 | kfree(nc); |
| 1211 | } |
| 1212 | /* |
| 1213 | * In the previous loop, all the objects were freed to |
| 1214 | * the respective cache's slabs, now we can go ahead and |
| 1215 | * shrink each nodelist to its limit. |
| 1216 | */ |
| 1217 | list_for_each_entry(cachep, &cache_chain, next) { |
| 1218 | l3 = cachep->nodelists[node]; |
| 1219 | if (!l3) |
| 1220 | continue; |
| 1221 | drain_freelist(cachep, l3, l3->free_objects); |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | static int __cpuinit cpuup_prepare(long cpu) |
| 1226 | { |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1227 | struct kmem_cache *cachep; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1228 | struct kmem_list3 *l3 = NULL; |
| 1229 | int node = cpu_to_node(cpu); |
David Howells | ea02e3d | 2007-07-19 01:49:09 -0700 | [diff] [blame] | 1230 | const int memsize = sizeof(struct kmem_list3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1232 | /* |
| 1233 | * We need to do this right in the beginning since |
| 1234 | * alloc_arraycache's are going to use this list. |
| 1235 | * kmalloc_node allows us to add the slab to the right |
| 1236 | * kmem_list3 and not this cpu's kmem_list3 |
| 1237 | */ |
| 1238 | |
| 1239 | list_for_each_entry(cachep, &cache_chain, next) { |
| 1240 | /* |
| 1241 | * Set up the size64 kmemlist for cpu before we can |
| 1242 | * begin anything. Make sure some other cpu on this |
| 1243 | * node has not already allocated this |
| 1244 | */ |
| 1245 | if (!cachep->nodelists[node]) { |
| 1246 | l3 = kmalloc_node(memsize, GFP_KERNEL, node); |
| 1247 | if (!l3) |
| 1248 | goto bad; |
| 1249 | kmem_list3_init(l3); |
| 1250 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + |
| 1251 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
| 1252 | |
| 1253 | /* |
| 1254 | * The l3s don't come and go as CPUs come and |
| 1255 | * go. cache_chain_mutex is sufficient |
| 1256 | * protection here. |
| 1257 | */ |
| 1258 | cachep->nodelists[node] = l3; |
| 1259 | } |
| 1260 | |
| 1261 | spin_lock_irq(&cachep->nodelists[node]->list_lock); |
| 1262 | cachep->nodelists[node]->free_limit = |
| 1263 | (1 + nr_cpus_node(node)) * |
| 1264 | cachep->batchcount + cachep->num; |
| 1265 | spin_unlock_irq(&cachep->nodelists[node]->list_lock); |
| 1266 | } |
| 1267 | |
| 1268 | /* |
| 1269 | * Now we can go ahead with allocating the shared arrays and |
| 1270 | * array caches |
| 1271 | */ |
| 1272 | list_for_each_entry(cachep, &cache_chain, next) { |
| 1273 | struct array_cache *nc; |
| 1274 | struct array_cache *shared = NULL; |
| 1275 | struct array_cache **alien = NULL; |
| 1276 | |
| 1277 | nc = alloc_arraycache(node, cachep->limit, |
| 1278 | cachep->batchcount); |
| 1279 | if (!nc) |
| 1280 | goto bad; |
| 1281 | if (cachep->shared) { |
| 1282 | shared = alloc_arraycache(node, |
| 1283 | cachep->shared * cachep->batchcount, |
| 1284 | 0xbaadf00d); |
Akinobu Mita | 12d00f6 | 2007-10-18 03:05:11 -0700 | [diff] [blame] | 1285 | if (!shared) { |
| 1286 | kfree(nc); |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1287 | goto bad; |
Akinobu Mita | 12d00f6 | 2007-10-18 03:05:11 -0700 | [diff] [blame] | 1288 | } |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1289 | } |
| 1290 | if (use_alien_caches) { |
| 1291 | alien = alloc_alien_cache(node, cachep->limit); |
Akinobu Mita | 12d00f6 | 2007-10-18 03:05:11 -0700 | [diff] [blame] | 1292 | if (!alien) { |
| 1293 | kfree(shared); |
| 1294 | kfree(nc); |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1295 | goto bad; |
Akinobu Mita | 12d00f6 | 2007-10-18 03:05:11 -0700 | [diff] [blame] | 1296 | } |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1297 | } |
| 1298 | cachep->array[cpu] = nc; |
| 1299 | l3 = cachep->nodelists[node]; |
| 1300 | BUG_ON(!l3); |
| 1301 | |
| 1302 | spin_lock_irq(&l3->list_lock); |
| 1303 | if (!l3->shared) { |
| 1304 | /* |
| 1305 | * We are serialised from CPU_DEAD or |
| 1306 | * CPU_UP_CANCELLED by the cpucontrol lock |
| 1307 | */ |
| 1308 | l3->shared = shared; |
| 1309 | shared = NULL; |
| 1310 | } |
| 1311 | #ifdef CONFIG_NUMA |
| 1312 | if (!l3->alien) { |
| 1313 | l3->alien = alien; |
| 1314 | alien = NULL; |
| 1315 | } |
| 1316 | #endif |
| 1317 | spin_unlock_irq(&l3->list_lock); |
| 1318 | kfree(shared); |
| 1319 | free_alien_cache(alien); |
| 1320 | } |
| 1321 | return 0; |
| 1322 | bad: |
Akinobu Mita | 12d00f6 | 2007-10-18 03:05:11 -0700 | [diff] [blame] | 1323 | cpuup_canceled(cpu); |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1324 | return -ENOMEM; |
| 1325 | } |
| 1326 | |
| 1327 | static int __cpuinit cpuup_callback(struct notifier_block *nfb, |
| 1328 | unsigned long action, void *hcpu) |
| 1329 | { |
| 1330 | long cpu = (long)hcpu; |
| 1331 | int err = 0; |
| 1332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | switch (action) { |
Heiko Carstens | 38c3bd9 | 2007-05-09 02:34:05 -0700 | [diff] [blame] | 1334 | case CPU_LOCK_ACQUIRE: |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 1335 | mutex_lock(&cache_chain_mutex); |
Heiko Carstens | 38c3bd9 | 2007-05-09 02:34:05 -0700 | [diff] [blame] | 1336 | break; |
| 1337 | case CPU_UP_PREPARE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1338 | case CPU_UP_PREPARE_FROZEN: |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1339 | err = cpuup_prepare(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | break; |
| 1341 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1342 | case CPU_ONLINE_FROZEN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | start_cpu_timer(cpu); |
| 1344 | break; |
| 1345 | #ifdef CONFIG_HOTPLUG_CPU |
Christoph Lameter | 5830c59 | 2007-05-09 02:34:22 -0700 | [diff] [blame] | 1346 | case CPU_DOWN_PREPARE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1347 | case CPU_DOWN_PREPARE_FROZEN: |
Christoph Lameter | 5830c59 | 2007-05-09 02:34:22 -0700 | [diff] [blame] | 1348 | /* |
| 1349 | * Shutdown cache reaper. Note that the cache_chain_mutex is |
| 1350 | * held so that if cache_reap() is invoked it cannot do |
| 1351 | * anything expensive but will only modify reap_work |
| 1352 | * and reschedule the timer. |
| 1353 | */ |
| 1354 | cancel_rearming_delayed_work(&per_cpu(reap_work, cpu)); |
| 1355 | /* Now the cache_reaper is guaranteed to be not running. */ |
| 1356 | per_cpu(reap_work, cpu).work.func = NULL; |
| 1357 | break; |
| 1358 | case CPU_DOWN_FAILED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1359 | case CPU_DOWN_FAILED_FROZEN: |
Christoph Lameter | 5830c59 | 2007-05-09 02:34:22 -0700 | [diff] [blame] | 1360 | start_cpu_timer(cpu); |
| 1361 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1363 | case CPU_DEAD_FROZEN: |
Ravikiran G Thirumalai | 4484ebf | 2006-02-04 23:27:59 -0800 | [diff] [blame] | 1364 | /* |
| 1365 | * Even if all the cpus of a node are down, we don't free the |
| 1366 | * kmem_list3 of any cache. This to avoid a race between |
| 1367 | * cpu_down, and a kmalloc allocation from another cpu for |
| 1368 | * memory from the node of the cpu going down. The list3 |
| 1369 | * structure is usually allocated from kmem_cache_create() and |
| 1370 | * gets destroyed at kmem_cache_destroy(). |
| 1371 | */ |
Simon Arlott | 183ff22 | 2007-10-20 01:27:18 +0200 | [diff] [blame] | 1372 | /* fall through */ |
Ravikiran G Thirumalai | 8f5be20 | 2006-12-06 20:32:14 -0800 | [diff] [blame] | 1373 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | case CPU_UP_CANCELED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1375 | case CPU_UP_CANCELED_FROZEN: |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1376 | cpuup_canceled(cpu); |
Heiko Carstens | 38c3bd9 | 2007-05-09 02:34:05 -0700 | [diff] [blame] | 1377 | break; |
| 1378 | case CPU_LOCK_RELEASE: |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 1379 | mutex_unlock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | } |
Akinobu Mita | fbf1e47 | 2007-10-18 03:05:09 -0700 | [diff] [blame] | 1382 | return err ? NOTIFY_BAD : NOTIFY_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | } |
| 1384 | |
Chandra Seetharaman | 74b85f3 | 2006-06-27 02:54:09 -0700 | [diff] [blame] | 1385 | static struct notifier_block __cpuinitdata cpucache_notifier = { |
| 1386 | &cpuup_callback, NULL, 0 |
| 1387 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1389 | /* |
| 1390 | * swap the static kmem_list3 with kmalloced memory |
| 1391 | */ |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1392 | static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, |
| 1393 | int nodeid) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1394 | { |
| 1395 | struct kmem_list3 *ptr; |
| 1396 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1397 | ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid); |
| 1398 | BUG_ON(!ptr); |
| 1399 | |
| 1400 | local_irq_disable(); |
| 1401 | memcpy(ptr, list, sizeof(struct kmem_list3)); |
Ingo Molnar | 2b2d549 | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1402 | /* |
| 1403 | * Do not assume that spinlocks can be initialized via memcpy: |
| 1404 | */ |
| 1405 | spin_lock_init(&ptr->list_lock); |
| 1406 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1407 | MAKE_ALL_LISTS(cachep, ptr, nodeid); |
| 1408 | cachep->nodelists[nodeid] = ptr; |
| 1409 | local_irq_enable(); |
| 1410 | } |
| 1411 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1412 | /* |
| 1413 | * Initialisation. Called after the page allocator have been initialised and |
| 1414 | * before smp_init(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | */ |
| 1416 | void __init kmem_cache_init(void) |
| 1417 | { |
| 1418 | size_t left_over; |
| 1419 | struct cache_sizes *sizes; |
| 1420 | struct cache_names *names; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1421 | int i; |
Jack Steiner | 07ed76b | 2006-03-07 21:55:46 -0800 | [diff] [blame] | 1422 | int order; |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1423 | int node; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1424 | |
Siddha, Suresh B | 1807a1a | 2007-08-22 14:01:49 -0700 | [diff] [blame] | 1425 | if (num_possible_nodes() == 1) { |
Siddha, Suresh B | 62918a0 | 2007-05-02 19:27:18 +0200 | [diff] [blame] | 1426 | use_alien_caches = 0; |
Siddha, Suresh B | 1807a1a | 2007-08-22 14:01:49 -0700 | [diff] [blame] | 1427 | numa_platform = 0; |
| 1428 | } |
Siddha, Suresh B | 62918a0 | 2007-05-02 19:27:18 +0200 | [diff] [blame] | 1429 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1430 | for (i = 0; i < NUM_INIT_LISTS; i++) { |
| 1431 | kmem_list3_init(&initkmem_list3[i]); |
| 1432 | if (i < MAX_NUMNODES) |
| 1433 | cache_cache.nodelists[i] = NULL; |
| 1434 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
| 1436 | /* |
| 1437 | * Fragmentation resistance on low memory - only use bigger |
| 1438 | * page orders on machines with more than 32MB of memory. |
| 1439 | */ |
| 1440 | if (num_physpages > (32 << 20) >> PAGE_SHIFT) |
| 1441 | slab_break_gfp_order = BREAK_GFP_ORDER_HI; |
| 1442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | /* Bootstrap is tricky, because several objects are allocated |
| 1444 | * from caches that do not exist yet: |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1445 | * 1) initialize the cache_cache cache: it contains the struct |
| 1446 | * kmem_cache structures of all caches, except cache_cache itself: |
| 1447 | * cache_cache is statically allocated. |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1448 | * Initially an __init data area is used for the head array and the |
| 1449 | * kmem_list3 structures, it's replaced with a kmalloc allocated |
| 1450 | * array at the end of the bootstrap. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | * 2) Create the first kmalloc cache. |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1452 | * The struct kmem_cache for the new cache is allocated normally. |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1453 | * An __init data area is used for the head array. |
| 1454 | * 3) Create the remaining kmalloc caches, with minimally sized |
| 1455 | * head arrays. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | * 4) Replace the __init data head arrays for cache_cache and the first |
| 1457 | * kmalloc cache with kmalloc allocated arrays. |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1458 | * 5) Replace the __init data for kmem_list3 for cache_cache and |
| 1459 | * the other cache's with kmalloc allocated memory. |
| 1460 | * 6) Resize the head arrays of the kmalloc caches to their final sizes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | */ |
| 1462 | |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1463 | node = numa_node_id(); |
| 1464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | /* 1) create the cache_cache */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | INIT_LIST_HEAD(&cache_chain); |
| 1467 | list_add(&cache_cache.next, &cache_chain); |
| 1468 | cache_cache.colour_off = cache_line_size(); |
| 1469 | cache_cache.array[smp_processor_id()] = &initarray_cache.cache; |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1470 | cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | |
Eric Dumazet | 8da3430 | 2007-05-06 14:49:29 -0700 | [diff] [blame] | 1472 | /* |
| 1473 | * struct kmem_cache size depends on nr_node_ids, which |
| 1474 | * can be less than MAX_NUMNODES. |
| 1475 | */ |
| 1476 | cache_cache.buffer_size = offsetof(struct kmem_cache, nodelists) + |
| 1477 | nr_node_ids * sizeof(struct kmem_list3 *); |
| 1478 | #if DEBUG |
| 1479 | cache_cache.obj_size = cache_cache.buffer_size; |
| 1480 | #endif |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1481 | cache_cache.buffer_size = ALIGN(cache_cache.buffer_size, |
| 1482 | cache_line_size()); |
Eric Dumazet | 6a2d7a9 | 2006-12-13 00:34:27 -0800 | [diff] [blame] | 1483 | cache_cache.reciprocal_buffer_size = |
| 1484 | reciprocal_value(cache_cache.buffer_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | |
Jack Steiner | 07ed76b | 2006-03-07 21:55:46 -0800 | [diff] [blame] | 1486 | for (order = 0; order < MAX_ORDER; order++) { |
| 1487 | cache_estimate(order, cache_cache.buffer_size, |
| 1488 | cache_line_size(), 0, &left_over, &cache_cache.num); |
| 1489 | if (cache_cache.num) |
| 1490 | break; |
| 1491 | } |
Eric Sesterhenn | 40094fa | 2006-04-02 13:49:25 +0200 | [diff] [blame] | 1492 | BUG_ON(!cache_cache.num); |
Jack Steiner | 07ed76b | 2006-03-07 21:55:46 -0800 | [diff] [blame] | 1493 | cache_cache.gfporder = order; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1494 | cache_cache.colour = left_over / cache_cache.colour_off; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1495 | cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) + |
| 1496 | sizeof(struct slab), cache_line_size()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | |
| 1498 | /* 2+3) create the kmalloc caches */ |
| 1499 | sizes = malloc_sizes; |
| 1500 | names = cache_names; |
| 1501 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1502 | /* |
| 1503 | * Initialize the caches that provide memory for the array cache and the |
| 1504 | * kmem_list3 structures first. Without this, further allocations will |
| 1505 | * bug. |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1506 | */ |
| 1507 | |
| 1508 | sizes[INDEX_AC].cs_cachep = kmem_cache_create(names[INDEX_AC].name, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1509 | sizes[INDEX_AC].cs_size, |
| 1510 | ARCH_KMALLOC_MINALIGN, |
| 1511 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1512 | NULL); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1513 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1514 | if (INDEX_AC != INDEX_L3) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1515 | sizes[INDEX_L3].cs_cachep = |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1516 | kmem_cache_create(names[INDEX_L3].name, |
| 1517 | sizes[INDEX_L3].cs_size, |
| 1518 | ARCH_KMALLOC_MINALIGN, |
| 1519 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1520 | NULL); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1521 | } |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1522 | |
Ingo Molnar | e0a4272 | 2006-06-23 02:03:46 -0700 | [diff] [blame] | 1523 | slab_early_init = 0; |
| 1524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | while (sizes->cs_size != ULONG_MAX) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1526 | /* |
| 1527 | * For performance, all the general caches are L1 aligned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | * This should be particularly beneficial on SMP boxes, as it |
| 1529 | * eliminates "false sharing". |
| 1530 | * Note for systems short on memory removing the alignment will |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1531 | * allow tighter packing of the smaller caches. |
| 1532 | */ |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1533 | if (!sizes->cs_cachep) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1534 | sizes->cs_cachep = kmem_cache_create(names->name, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1535 | sizes->cs_size, |
| 1536 | ARCH_KMALLOC_MINALIGN, |
| 1537 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1538 | NULL); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1539 | } |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 1540 | #ifdef CONFIG_ZONE_DMA |
| 1541 | sizes->cs_dmacachep = kmem_cache_create( |
| 1542 | names->name_dma, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1543 | sizes->cs_size, |
| 1544 | ARCH_KMALLOC_MINALIGN, |
| 1545 | ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| |
| 1546 | SLAB_PANIC, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1547 | NULL); |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 1548 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | sizes++; |
| 1550 | names++; |
| 1551 | } |
| 1552 | /* 4) Replace the bootstrap head arrays */ |
| 1553 | { |
Ingo Molnar | 2b2d549 | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1554 | struct array_cache *ptr; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1555 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | local_irq_disable(); |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 1559 | BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); |
| 1560 | memcpy(ptr, cpu_cache_get(&cache_cache), |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1561 | sizeof(struct arraycache_init)); |
Ingo Molnar | 2b2d549 | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1562 | /* |
| 1563 | * Do not assume that spinlocks can be initialized via memcpy: |
| 1564 | */ |
| 1565 | spin_lock_init(&ptr->lock); |
| 1566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | cache_cache.array[smp_processor_id()] = ptr; |
| 1568 | local_irq_enable(); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | local_irq_disable(); |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 1573 | BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1574 | != &initarray_generic.cache); |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 1575 | memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1576 | sizeof(struct arraycache_init)); |
Ingo Molnar | 2b2d549 | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1577 | /* |
| 1578 | * Do not assume that spinlocks can be initialized via memcpy: |
| 1579 | */ |
| 1580 | spin_lock_init(&ptr->lock); |
| 1581 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1582 | malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1583 | ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | local_irq_enable(); |
| 1585 | } |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1586 | /* 5) Replace the bootstrap kmem_list3's */ |
| 1587 | { |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1588 | int nid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1590 | /* Replace the static kmem_list3 structures for the boot cpu */ |
| 1591 | init_list(&cache_cache, &initkmem_list3[CACHE_CACHE], node); |
| 1592 | |
Christoph Lameter | 04231b3 | 2007-10-16 01:25:32 -0700 | [diff] [blame] | 1593 | for_each_node_state(nid, N_NORMAL_MEMORY) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1594 | init_list(malloc_sizes[INDEX_AC].cs_cachep, |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1595 | &initkmem_list3[SIZE_AC + nid], nid); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1596 | |
| 1597 | if (INDEX_AC != INDEX_L3) { |
| 1598 | init_list(malloc_sizes[INDEX_L3].cs_cachep, |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 1599 | &initkmem_list3[SIZE_L3 + nid], nid); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1600 | } |
| 1601 | } |
| 1602 | } |
| 1603 | |
| 1604 | /* 6) resize the head arrays to their final sizes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | { |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1606 | struct kmem_cache *cachep; |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 1607 | mutex_lock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | list_for_each_entry(cachep, &cache_chain, next) |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 1609 | if (enable_cpucache(cachep)) |
| 1610 | BUG(); |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 1611 | mutex_unlock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | } |
| 1613 | |
Ravikiran G Thirumalai | 056c624 | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 1614 | /* Annotate slab for lockdep -- annotate the malloc caches */ |
| 1615 | init_lock_keys(); |
| 1616 | |
| 1617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | /* Done! */ |
| 1619 | g_cpucache_up = FULL; |
| 1620 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1621 | /* |
| 1622 | * Register a cpu startup notifier callback that initializes |
| 1623 | * cpu_cache_get for all new cpus |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | */ |
| 1625 | register_cpu_notifier(&cpucache_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1627 | /* |
| 1628 | * The reap timers are started later, with a module init call: That part |
| 1629 | * of the kernel is not yet operational. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | */ |
| 1631 | } |
| 1632 | |
| 1633 | static int __init cpucache_init(void) |
| 1634 | { |
| 1635 | int cpu; |
| 1636 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1637 | /* |
| 1638 | * Register the timers that return unneeded pages to the page allocator |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | */ |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1640 | for_each_online_cpu(cpu) |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1641 | start_cpu_timer(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | return 0; |
| 1643 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | __initcall(cpucache_init); |
| 1645 | |
| 1646 | /* |
| 1647 | * Interface to system's page allocator. No need to hold the cache-lock. |
| 1648 | * |
| 1649 | * If we requested dmaable memory, we will get it. Even if we |
| 1650 | * did not request dmaable memory, we might get it, but that |
| 1651 | * would be relatively rare and ignorable. |
| 1652 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1653 | static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | { |
| 1655 | struct page *page; |
Christoph Hellwig | e1b6aa6 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 1656 | int nr_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | int i; |
| 1658 | |
Luke Yang | d6fef9d | 2006-04-10 22:52:56 -0700 | [diff] [blame] | 1659 | #ifndef CONFIG_MMU |
Christoph Hellwig | e1b6aa6 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 1660 | /* |
| 1661 | * Nommu uses slab's for process anonymous memory allocations, and thus |
| 1662 | * requires __GFP_COMP to properly refcount higher order allocations |
Luke Yang | d6fef9d | 2006-04-10 22:52:56 -0700 | [diff] [blame] | 1663 | */ |
Christoph Hellwig | e1b6aa6 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 1664 | flags |= __GFP_COMP; |
Luke Yang | d6fef9d | 2006-04-10 22:52:56 -0700 | [diff] [blame] | 1665 | #endif |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 1666 | |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 1667 | flags |= cachep->gfpflags; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1668 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
| 1669 | flags |= __GFP_RECLAIMABLE; |
Christoph Hellwig | e1b6aa6 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 1670 | |
| 1671 | page = alloc_pages_node(nodeid, flags, cachep->gfporder); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | if (!page) |
| 1673 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | |
Christoph Hellwig | e1b6aa6 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 1675 | nr_pages = (1 << cachep->gfporder); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
Christoph Lameter | 972d1a7 | 2006-09-25 23:31:51 -0700 | [diff] [blame] | 1677 | add_zone_page_state(page_zone(page), |
| 1678 | NR_SLAB_RECLAIMABLE, nr_pages); |
| 1679 | else |
| 1680 | add_zone_page_state(page_zone(page), |
| 1681 | NR_SLAB_UNRECLAIMABLE, nr_pages); |
Christoph Hellwig | e1b6aa6 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 1682 | for (i = 0; i < nr_pages; i++) |
| 1683 | __SetPageSlab(page + i); |
| 1684 | return page_address(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | } |
| 1686 | |
| 1687 | /* |
| 1688 | * Interface to system's page release. |
| 1689 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1690 | static void kmem_freepages(struct kmem_cache *cachep, void *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1692 | unsigned long i = (1 << cachep->gfporder); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | struct page *page = virt_to_page(addr); |
| 1694 | const unsigned long nr_freed = i; |
| 1695 | |
Christoph Lameter | 972d1a7 | 2006-09-25 23:31:51 -0700 | [diff] [blame] | 1696 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
| 1697 | sub_zone_page_state(page_zone(page), |
| 1698 | NR_SLAB_RECLAIMABLE, nr_freed); |
| 1699 | else |
| 1700 | sub_zone_page_state(page_zone(page), |
| 1701 | NR_SLAB_UNRECLAIMABLE, nr_freed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | while (i--) { |
Nick Piggin | f205b2f | 2006-03-22 00:08:02 -0800 | [diff] [blame] | 1703 | BUG_ON(!PageSlab(page)); |
| 1704 | __ClearPageSlab(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | page++; |
| 1706 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | if (current->reclaim_state) |
| 1708 | current->reclaim_state->reclaimed_slab += nr_freed; |
| 1709 | free_pages((unsigned long)addr, cachep->gfporder); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | } |
| 1711 | |
| 1712 | static void kmem_rcu_free(struct rcu_head *head) |
| 1713 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1714 | struct slab_rcu *slab_rcu = (struct slab_rcu *)head; |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1715 | struct kmem_cache *cachep = slab_rcu->cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | |
| 1717 | kmem_freepages(cachep, slab_rcu->addr); |
| 1718 | if (OFF_SLAB(cachep)) |
| 1719 | kmem_cache_free(cachep->slabp_cache, slab_rcu); |
| 1720 | } |
| 1721 | |
| 1722 | #if DEBUG |
| 1723 | |
| 1724 | #ifdef CONFIG_DEBUG_PAGEALLOC |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1725 | static void store_stackinfo(struct kmem_cache *cachep, unsigned long *addr, |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1726 | unsigned long caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | { |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 1728 | int size = obj_size(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 1730 | addr = (unsigned long *)&((char *)addr)[obj_offset(cachep)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1732 | if (size < 5 * sizeof(unsigned long)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | return; |
| 1734 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1735 | *addr++ = 0x12345678; |
| 1736 | *addr++ = caller; |
| 1737 | *addr++ = smp_processor_id(); |
| 1738 | size -= 3 * sizeof(unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | { |
| 1740 | unsigned long *sptr = &caller; |
| 1741 | unsigned long svalue; |
| 1742 | |
| 1743 | while (!kstack_end(sptr)) { |
| 1744 | svalue = *sptr++; |
| 1745 | if (kernel_text_address(svalue)) { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1746 | *addr++ = svalue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | size -= sizeof(unsigned long); |
| 1748 | if (size <= sizeof(unsigned long)) |
| 1749 | break; |
| 1750 | } |
| 1751 | } |
| 1752 | |
| 1753 | } |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1754 | *addr++ = 0x87654321; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | } |
| 1756 | #endif |
| 1757 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1758 | static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | { |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 1760 | int size = obj_size(cachep); |
| 1761 | addr = &((char *)addr)[obj_offset(cachep)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | |
| 1763 | memset(addr, val, size); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1764 | *(unsigned char *)(addr + size - 1) = POISON_END; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | } |
| 1766 | |
| 1767 | static void dump_line(char *data, int offset, int limit) |
| 1768 | { |
| 1769 | int i; |
Dave Jones | aa83aa4 | 2006-09-29 01:59:51 -0700 | [diff] [blame] | 1770 | unsigned char error = 0; |
| 1771 | int bad_count = 0; |
| 1772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | printk(KERN_ERR "%03x:", offset); |
Dave Jones | aa83aa4 | 2006-09-29 01:59:51 -0700 | [diff] [blame] | 1774 | for (i = 0; i < limit; i++) { |
| 1775 | if (data[offset + i] != POISON_FREE) { |
| 1776 | error = data[offset + i]; |
| 1777 | bad_count++; |
| 1778 | } |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1779 | printk(" %02x", (unsigned char)data[offset + i]); |
Dave Jones | aa83aa4 | 2006-09-29 01:59:51 -0700 | [diff] [blame] | 1780 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | printk("\n"); |
Dave Jones | aa83aa4 | 2006-09-29 01:59:51 -0700 | [diff] [blame] | 1782 | |
| 1783 | if (bad_count == 1) { |
| 1784 | error ^= POISON_FREE; |
| 1785 | if (!(error & (error - 1))) { |
| 1786 | printk(KERN_ERR "Single bit error detected. Probably " |
| 1787 | "bad RAM.\n"); |
| 1788 | #ifdef CONFIG_X86 |
| 1789 | printk(KERN_ERR "Run memtest86+ or a similar memory " |
| 1790 | "test tool.\n"); |
| 1791 | #else |
| 1792 | printk(KERN_ERR "Run a memory test tool.\n"); |
| 1793 | #endif |
| 1794 | } |
| 1795 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | } |
| 1797 | #endif |
| 1798 | |
| 1799 | #if DEBUG |
| 1800 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1801 | static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | { |
| 1803 | int i, size; |
| 1804 | char *realobj; |
| 1805 | |
| 1806 | if (cachep->flags & SLAB_RED_ZONE) { |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 1807 | printk(KERN_ERR "Redzone: 0x%llx/0x%llx.\n", |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1808 | *dbg_redzone1(cachep, objp), |
| 1809 | *dbg_redzone2(cachep, objp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | } |
| 1811 | |
| 1812 | if (cachep->flags & SLAB_STORE_USER) { |
| 1813 | printk(KERN_ERR "Last user: [<%p>]", |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1814 | *dbg_userword(cachep, objp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | print_symbol("(%s)", |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1816 | (unsigned long)*dbg_userword(cachep, objp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | printk("\n"); |
| 1818 | } |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 1819 | realobj = (char *)objp + obj_offset(cachep); |
| 1820 | size = obj_size(cachep); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1821 | for (i = 0; i < size && lines; i += 16, lines--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | int limit; |
| 1823 | limit = 16; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1824 | if (i + limit > size) |
| 1825 | limit = size - i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | dump_line(realobj, i, limit); |
| 1827 | } |
| 1828 | } |
| 1829 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1830 | static void check_poison_obj(struct kmem_cache *cachep, void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | { |
| 1832 | char *realobj; |
| 1833 | int size, i; |
| 1834 | int lines = 0; |
| 1835 | |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 1836 | realobj = (char *)objp + obj_offset(cachep); |
| 1837 | size = obj_size(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1839 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | char exp = POISON_FREE; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1841 | if (i == size - 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | exp = POISON_END; |
| 1843 | if (realobj[i] != exp) { |
| 1844 | int limit; |
| 1845 | /* Mismatch ! */ |
| 1846 | /* Print header */ |
| 1847 | if (lines == 0) { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1848 | printk(KERN_ERR |
David Howells | e94a40c | 2007-04-02 23:46:28 +0100 | [diff] [blame] | 1849 | "Slab corruption: %s start=%p, len=%d\n", |
| 1850 | cachep->name, realobj, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | print_objinfo(cachep, objp, 0); |
| 1852 | } |
| 1853 | /* Hexdump the affected line */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1854 | i = (i / 16) * 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | limit = 16; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1856 | if (i + limit > size) |
| 1857 | limit = size - i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | dump_line(realobj, i, limit); |
| 1859 | i += 16; |
| 1860 | lines++; |
| 1861 | /* Limit to 5 lines */ |
| 1862 | if (lines > 5) |
| 1863 | break; |
| 1864 | } |
| 1865 | } |
| 1866 | if (lines != 0) { |
| 1867 | /* Print some data about the neighboring objects, if they |
| 1868 | * exist: |
| 1869 | */ |
Pekka Enberg | 6ed5eb221 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 1870 | struct slab *slabp = virt_to_slab(objp); |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 1871 | unsigned int objnr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 1873 | objnr = obj_to_index(cachep, slabp, objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | if (objnr) { |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 1875 | objp = index_to_obj(cachep, slabp, objnr - 1); |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 1876 | realobj = (char *)objp + obj_offset(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | printk(KERN_ERR "Prev obj: start=%p, len=%d\n", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1878 | realobj, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | print_objinfo(cachep, objp, 2); |
| 1880 | } |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1881 | if (objnr + 1 < cachep->num) { |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 1882 | objp = index_to_obj(cachep, slabp, objnr + 1); |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 1883 | realobj = (char *)objp + obj_offset(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | printk(KERN_ERR "Next obj: start=%p, len=%d\n", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1885 | realobj, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | print_objinfo(cachep, objp, 2); |
| 1887 | } |
| 1888 | } |
| 1889 | } |
| 1890 | #endif |
| 1891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | #if DEBUG |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1893 | /** |
Randy Dunlap | 911851e | 2006-03-22 00:08:14 -0800 | [diff] [blame] | 1894 | * slab_destroy_objs - destroy a slab and its objects |
| 1895 | * @cachep: cache pointer being destroyed |
| 1896 | * @slabp: slab pointer being destroyed |
| 1897 | * |
| 1898 | * Call the registered destructor for each object in a slab that is being |
| 1899 | * destroyed. |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1900 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1901 | static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1902 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | int i; |
| 1904 | for (i = 0; i < cachep->num; i++) { |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 1905 | void *objp = index_to_obj(cachep, slabp, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | |
| 1907 | if (cachep->flags & SLAB_POISON) { |
| 1908 | #ifdef CONFIG_DEBUG_PAGEALLOC |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1909 | if (cachep->buffer_size % PAGE_SIZE == 0 && |
| 1910 | OFF_SLAB(cachep)) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1911 | kernel_map_pages(virt_to_page(objp), |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1912 | cachep->buffer_size / PAGE_SIZE, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | else |
| 1914 | check_poison_obj(cachep, objp); |
| 1915 | #else |
| 1916 | check_poison_obj(cachep, objp); |
| 1917 | #endif |
| 1918 | } |
| 1919 | if (cachep->flags & SLAB_RED_ZONE) { |
| 1920 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) |
| 1921 | slab_error(cachep, "start of a freed object " |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1922 | "was overwritten"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) |
| 1924 | slab_error(cachep, "end of a freed object " |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1925 | "was overwritten"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | } |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1928 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | #else |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1930 | static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1931 | { |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1932 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | #endif |
| 1934 | |
Randy Dunlap | 911851e | 2006-03-22 00:08:14 -0800 | [diff] [blame] | 1935 | /** |
| 1936 | * slab_destroy - destroy and release all objects in a slab |
| 1937 | * @cachep: cache pointer being destroyed |
| 1938 | * @slabp: slab pointer being destroyed |
| 1939 | * |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1940 | * Destroy all the objs in a slab, and release the mem back to the system. |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1941 | * Before calling the slab must have been unlinked from the cache. The |
| 1942 | * cache-lock is not held/needed. |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1943 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 1944 | static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) |
Matthew Dobson | 12dd36f | 2006-02-01 03:05:46 -0800 | [diff] [blame] | 1945 | { |
| 1946 | void *addr = slabp->s_mem - slabp->colouroff; |
| 1947 | |
| 1948 | slab_destroy_objs(cachep, slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) { |
| 1950 | struct slab_rcu *slab_rcu; |
| 1951 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1952 | slab_rcu = (struct slab_rcu *)slabp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | slab_rcu->cachep = cachep; |
| 1954 | slab_rcu->addr = addr; |
| 1955 | call_rcu(&slab_rcu->head, kmem_rcu_free); |
| 1956 | } else { |
| 1957 | kmem_freepages(cachep, addr); |
Ingo Molnar | 873623d | 2006-07-13 14:44:38 +0200 | [diff] [blame] | 1958 | if (OFF_SLAB(cachep)) |
| 1959 | kmem_cache_free(cachep->slabp_cache, slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | } |
| 1961 | } |
| 1962 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 1963 | /* |
| 1964 | * For setting up all the kmem_list3s for cache whose buffer_size is same as |
| 1965 | * size of kmem_list3. |
| 1966 | */ |
Andrew Morton | a3a02be | 2007-05-06 14:49:31 -0700 | [diff] [blame] | 1967 | static void __init set_up_list3s(struct kmem_cache *cachep, int index) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1968 | { |
| 1969 | int node; |
| 1970 | |
Christoph Lameter | 04231b3 | 2007-10-16 01:25:32 -0700 | [diff] [blame] | 1971 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1972 | cachep->nodelists[node] = &initkmem_list3[index + node]; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1973 | cachep->nodelists[node]->next_reap = jiffies + |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 1974 | REAPTIMEOUT_LIST3 + |
| 1975 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 1976 | } |
| 1977 | } |
| 1978 | |
Christoph Lameter | 117f6eb | 2006-09-25 23:31:37 -0700 | [diff] [blame] | 1979 | static void __kmem_cache_destroy(struct kmem_cache *cachep) |
| 1980 | { |
| 1981 | int i; |
| 1982 | struct kmem_list3 *l3; |
| 1983 | |
| 1984 | for_each_online_cpu(i) |
| 1985 | kfree(cachep->array[i]); |
| 1986 | |
| 1987 | /* NUMA: free the list3 structures */ |
| 1988 | for_each_online_node(i) { |
| 1989 | l3 = cachep->nodelists[i]; |
| 1990 | if (l3) { |
| 1991 | kfree(l3->shared); |
| 1992 | free_alien_cache(l3->alien); |
| 1993 | kfree(l3); |
| 1994 | } |
| 1995 | } |
| 1996 | kmem_cache_free(&cache_cache, cachep); |
| 1997 | } |
| 1998 | |
| 1999 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | /** |
Randy.Dunlap | a70773d | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 2001 | * calculate_slab_order - calculate size (page order) of slabs |
| 2002 | * @cachep: pointer to the cache that is being created |
| 2003 | * @size: size of objects to be created in this cache. |
| 2004 | * @align: required alignment for the objects. |
| 2005 | * @flags: slab allocation flags |
| 2006 | * |
| 2007 | * Also calculates the number of objects per slab. |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2008 | * |
| 2009 | * This could be made much more intelligent. For now, try to avoid using |
| 2010 | * high order pages for slabs. When the gfp() functions are more friendly |
| 2011 | * towards high-order requests, this should be changed. |
| 2012 | */ |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2013 | static size_t calculate_slab_order(struct kmem_cache *cachep, |
Randy Dunlap | ee13d78 | 2006-02-01 03:05:53 -0800 | [diff] [blame] | 2014 | size_t size, size_t align, unsigned long flags) |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2015 | { |
Ingo Molnar | b1ab41c | 2006-06-02 15:44:58 +0200 | [diff] [blame] | 2016 | unsigned long offslab_limit; |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2017 | size_t left_over = 0; |
Linus Torvalds | 9888e6f | 2006-03-06 17:44:43 -0800 | [diff] [blame] | 2018 | int gfporder; |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2019 | |
Christoph Lameter | 0aa817f | 2007-05-16 22:11:01 -0700 | [diff] [blame] | 2020 | for (gfporder = 0; gfporder <= KMALLOC_MAX_ORDER; gfporder++) { |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2021 | unsigned int num; |
| 2022 | size_t remainder; |
| 2023 | |
Linus Torvalds | 9888e6f | 2006-03-06 17:44:43 -0800 | [diff] [blame] | 2024 | cache_estimate(gfporder, size, align, flags, &remainder, &num); |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2025 | if (!num) |
| 2026 | continue; |
Linus Torvalds | 9888e6f | 2006-03-06 17:44:43 -0800 | [diff] [blame] | 2027 | |
Ingo Molnar | b1ab41c | 2006-06-02 15:44:58 +0200 | [diff] [blame] | 2028 | if (flags & CFLGS_OFF_SLAB) { |
| 2029 | /* |
| 2030 | * Max number of objs-per-slab for caches which |
| 2031 | * use off-slab slabs. Needed to avoid a possible |
| 2032 | * looping condition in cache_grow(). |
| 2033 | */ |
| 2034 | offslab_limit = size - sizeof(struct slab); |
| 2035 | offslab_limit /= sizeof(kmem_bufctl_t); |
| 2036 | |
| 2037 | if (num > offslab_limit) |
| 2038 | break; |
| 2039 | } |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2040 | |
Linus Torvalds | 9888e6f | 2006-03-06 17:44:43 -0800 | [diff] [blame] | 2041 | /* Found something acceptable - save it away */ |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2042 | cachep->num = num; |
Linus Torvalds | 9888e6f | 2006-03-06 17:44:43 -0800 | [diff] [blame] | 2043 | cachep->gfporder = gfporder; |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2044 | left_over = remainder; |
| 2045 | |
| 2046 | /* |
Linus Torvalds | f78bb8a | 2006-03-08 10:33:05 -0800 | [diff] [blame] | 2047 | * A VFS-reclaimable slab tends to have most allocations |
| 2048 | * as GFP_NOFS and we really don't want to have to be allocating |
| 2049 | * higher-order pages when we are unable to shrink dcache. |
| 2050 | */ |
| 2051 | if (flags & SLAB_RECLAIM_ACCOUNT) |
| 2052 | break; |
| 2053 | |
| 2054 | /* |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2055 | * Large number of objects is good, but very large slabs are |
| 2056 | * currently bad for the gfp()s. |
| 2057 | */ |
Linus Torvalds | 9888e6f | 2006-03-06 17:44:43 -0800 | [diff] [blame] | 2058 | if (gfporder >= slab_break_gfp_order) |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2059 | break; |
| 2060 | |
Linus Torvalds | 9888e6f | 2006-03-06 17:44:43 -0800 | [diff] [blame] | 2061 | /* |
| 2062 | * Acceptable internal fragmentation? |
| 2063 | */ |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2064 | if (left_over * 8 <= (PAGE_SIZE << gfporder)) |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2065 | break; |
| 2066 | } |
| 2067 | return left_over; |
| 2068 | } |
| 2069 | |
Sam Ravnborg | 38bdc32 | 2007-05-17 23:48:19 +0200 | [diff] [blame] | 2070 | static int __init_refok setup_cpu_cache(struct kmem_cache *cachep) |
Pekka Enberg | f30cf7d | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2071 | { |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 2072 | if (g_cpucache_up == FULL) |
| 2073 | return enable_cpucache(cachep); |
| 2074 | |
Pekka Enberg | f30cf7d | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2075 | if (g_cpucache_up == NONE) { |
| 2076 | /* |
| 2077 | * Note: the first kmem_cache_create must create the cache |
| 2078 | * that's used by kmalloc(24), otherwise the creation of |
| 2079 | * further caches will BUG(). |
| 2080 | */ |
| 2081 | cachep->array[smp_processor_id()] = &initarray_generic.cache; |
| 2082 | |
| 2083 | /* |
| 2084 | * If the cache that's used by kmalloc(sizeof(kmem_list3)) is |
| 2085 | * the first cache, then we need to set up all its list3s, |
| 2086 | * otherwise the creation of further caches will BUG(). |
| 2087 | */ |
| 2088 | set_up_list3s(cachep, SIZE_AC); |
| 2089 | if (INDEX_AC == INDEX_L3) |
| 2090 | g_cpucache_up = PARTIAL_L3; |
| 2091 | else |
| 2092 | g_cpucache_up = PARTIAL_AC; |
| 2093 | } else { |
| 2094 | cachep->array[smp_processor_id()] = |
| 2095 | kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); |
| 2096 | |
| 2097 | if (g_cpucache_up == PARTIAL_AC) { |
| 2098 | set_up_list3s(cachep, SIZE_L3); |
| 2099 | g_cpucache_up = PARTIAL_L3; |
| 2100 | } else { |
| 2101 | int node; |
Christoph Lameter | 04231b3 | 2007-10-16 01:25:32 -0700 | [diff] [blame] | 2102 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Pekka Enberg | f30cf7d | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2103 | cachep->nodelists[node] = |
| 2104 | kmalloc_node(sizeof(struct kmem_list3), |
| 2105 | GFP_KERNEL, node); |
| 2106 | BUG_ON(!cachep->nodelists[node]); |
| 2107 | kmem_list3_init(cachep->nodelists[node]); |
| 2108 | } |
| 2109 | } |
| 2110 | } |
| 2111 | cachep->nodelists[numa_node_id()]->next_reap = |
| 2112 | jiffies + REAPTIMEOUT_LIST3 + |
| 2113 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
| 2114 | |
| 2115 | cpu_cache_get(cachep)->avail = 0; |
| 2116 | cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; |
| 2117 | cpu_cache_get(cachep)->batchcount = 1; |
| 2118 | cpu_cache_get(cachep)->touched = 0; |
| 2119 | cachep->batchcount = 1; |
| 2120 | cachep->limit = BOOT_CPUCACHE_ENTRIES; |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 2121 | return 0; |
Pekka Enberg | f30cf7d | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2122 | } |
| 2123 | |
Pekka Enberg | 4d268eb | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 2124 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | * kmem_cache_create - Create a cache. |
| 2126 | * @name: A string which is used in /proc/slabinfo to identify this cache. |
| 2127 | * @size: The size of objects to be created in this cache. |
| 2128 | * @align: The required alignment for the objects. |
| 2129 | * @flags: SLAB flags |
| 2130 | * @ctor: A constructor for the objects. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | * |
| 2132 | * Returns a ptr to the cache on success, NULL on failure. |
| 2133 | * Cannot be called within a int, but can be interrupted. |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2134 | * The @ctor is run when new pages are allocated by the cache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | * |
| 2136 | * @name must be valid until the cache is destroyed. This implies that |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2137 | * the module calling this has to destroy the cache before getting unloaded. |
| 2138 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | * The flags are |
| 2140 | * |
| 2141 | * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) |
| 2142 | * to catch references to uninitialised memory. |
| 2143 | * |
| 2144 | * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check |
| 2145 | * for buffer overruns. |
| 2146 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware |
| 2148 | * cacheline. This can be beneficial if you're counting cycles as closely |
| 2149 | * as davem. |
| 2150 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2151 | struct kmem_cache * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | kmem_cache_create (const char *name, size_t size, size_t align, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2153 | unsigned long flags, |
Christoph Lameter | 4ba9b9d | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 2154 | void (*ctor)(struct kmem_cache *, void *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | { |
| 2156 | size_t left_over, slab_size, ralign; |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 2157 | struct kmem_cache *cachep = NULL, *pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | |
| 2159 | /* |
| 2160 | * Sanity checks... these are all serious usage bugs. |
| 2161 | */ |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2162 | if (!name || in_interrupt() || (size < BYTES_PER_WORD) || |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2163 | size > KMALLOC_MAX_SIZE) { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2164 | printk(KERN_ERR "%s: Early error in slab %s\n", __FUNCTION__, |
| 2165 | name); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2166 | BUG(); |
| 2167 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | |
Ravikiran G Thirumalai | f0188f4 | 2006-02-10 01:51:13 -0800 | [diff] [blame] | 2169 | /* |
Ravikiran G Thirumalai | 8f5be20 | 2006-12-06 20:32:14 -0800 | [diff] [blame] | 2170 | * We use cache_chain_mutex to ensure a consistent view of |
| 2171 | * cpu_online_map as well. Please see cpuup_callback |
Ravikiran G Thirumalai | f0188f4 | 2006-02-10 01:51:13 -0800 | [diff] [blame] | 2172 | */ |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 2173 | mutex_lock(&cache_chain_mutex); |
Andrew Morton | 4f12bb4 | 2005-11-07 00:58:00 -0800 | [diff] [blame] | 2174 | |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 2175 | list_for_each_entry(pc, &cache_chain, next) { |
Andrew Morton | 4f12bb4 | 2005-11-07 00:58:00 -0800 | [diff] [blame] | 2176 | char tmp; |
| 2177 | int res; |
| 2178 | |
| 2179 | /* |
| 2180 | * This happens when the module gets unloaded and doesn't |
| 2181 | * destroy its slab cache and no-one else reuses the vmalloc |
| 2182 | * area of the module. Print a warning. |
| 2183 | */ |
Andrew Morton | 138ae66 | 2006-12-06 20:36:41 -0800 | [diff] [blame] | 2184 | res = probe_kernel_address(pc->name, tmp); |
Andrew Morton | 4f12bb4 | 2005-11-07 00:58:00 -0800 | [diff] [blame] | 2185 | if (res) { |
matze | b416952 | 2007-05-06 14:49:52 -0700 | [diff] [blame] | 2186 | printk(KERN_ERR |
| 2187 | "SLAB: cache with size %d has lost its name\n", |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 2188 | pc->buffer_size); |
Andrew Morton | 4f12bb4 | 2005-11-07 00:58:00 -0800 | [diff] [blame] | 2189 | continue; |
| 2190 | } |
| 2191 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2192 | if (!strcmp(pc->name, name)) { |
matze | b416952 | 2007-05-06 14:49:52 -0700 | [diff] [blame] | 2193 | printk(KERN_ERR |
| 2194 | "kmem_cache_create: duplicate cache %s\n", name); |
Andrew Morton | 4f12bb4 | 2005-11-07 00:58:00 -0800 | [diff] [blame] | 2195 | dump_stack(); |
| 2196 | goto oops; |
| 2197 | } |
| 2198 | } |
| 2199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | #if DEBUG |
| 2201 | WARN_ON(strchr(name, ' ')); /* It confuses parsers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | #if FORCED_DEBUG |
| 2203 | /* |
| 2204 | * Enable redzoning and last user accounting, except for caches with |
| 2205 | * large objects, if the increased size would increase the object size |
| 2206 | * above the next power of two: caches with object sizes just above a |
| 2207 | * power of two have a significant amount of internal fragmentation. |
| 2208 | */ |
David Woodhouse | 87a927c | 2007-07-04 21:26:44 -0400 | [diff] [blame] | 2209 | if (size < 4096 || fls(size - 1) == fls(size-1 + REDZONE_ALIGN + |
| 2210 | 2 * sizeof(unsigned long long))) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2211 | flags |= SLAB_RED_ZONE | SLAB_STORE_USER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | if (!(flags & SLAB_DESTROY_BY_RCU)) |
| 2213 | flags |= SLAB_POISON; |
| 2214 | #endif |
| 2215 | if (flags & SLAB_DESTROY_BY_RCU) |
| 2216 | BUG_ON(flags & SLAB_POISON); |
| 2217 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | /* |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2219 | * Always checks flags, a caller might be expecting debug support which |
| 2220 | * isn't available. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | */ |
Eric Sesterhenn | 40094fa | 2006-04-02 13:49:25 +0200 | [diff] [blame] | 2222 | BUG_ON(flags & ~CREATE_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2224 | /* |
| 2225 | * Check that size is in terms of words. This is needed to avoid |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | * unaligned accesses for some archs when redzoning is used, and makes |
| 2227 | * sure any on-slab bufctl's are also correctly aligned. |
| 2228 | */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2229 | if (size & (BYTES_PER_WORD - 1)) { |
| 2230 | size += (BYTES_PER_WORD - 1); |
| 2231 | size &= ~(BYTES_PER_WORD - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | } |
| 2233 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2234 | /* calculate the final buffer alignment: */ |
| 2235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | /* 1) arch recommendation: can be overridden for debug */ |
| 2237 | if (flags & SLAB_HWCACHE_ALIGN) { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2238 | /* |
| 2239 | * Default alignment: as specified by the arch code. Except if |
| 2240 | * an object is really small, then squeeze multiple objects into |
| 2241 | * one cacheline. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | */ |
| 2243 | ralign = cache_line_size(); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2244 | while (size <= ralign / 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | ralign /= 2; |
| 2246 | } else { |
| 2247 | ralign = BYTES_PER_WORD; |
| 2248 | } |
Pekka Enberg | ca5f970 | 2006-09-25 23:31:25 -0700 | [diff] [blame] | 2249 | |
| 2250 | /* |
David Woodhouse | 87a927c | 2007-07-04 21:26:44 -0400 | [diff] [blame] | 2251 | * Redzoning and user store require word alignment or possibly larger. |
| 2252 | * Note this will be overridden by architecture or caller mandated |
| 2253 | * alignment if either is greater than BYTES_PER_WORD. |
Pekka Enberg | ca5f970 | 2006-09-25 23:31:25 -0700 | [diff] [blame] | 2254 | */ |
David Woodhouse | 87a927c | 2007-07-04 21:26:44 -0400 | [diff] [blame] | 2255 | if (flags & SLAB_STORE_USER) |
| 2256 | ralign = BYTES_PER_WORD; |
| 2257 | |
| 2258 | if (flags & SLAB_RED_ZONE) { |
| 2259 | ralign = REDZONE_ALIGN; |
| 2260 | /* If redzoning, ensure that the second redzone is suitably |
| 2261 | * aligned, by adjusting the object size accordingly. */ |
| 2262 | size += REDZONE_ALIGN - 1; |
| 2263 | size &= ~(REDZONE_ALIGN - 1); |
| 2264 | } |
Pekka Enberg | ca5f970 | 2006-09-25 23:31:25 -0700 | [diff] [blame] | 2265 | |
Kevin Hilman | a44b56d | 2006-12-06 20:32:11 -0800 | [diff] [blame] | 2266 | /* 2) arch mandated alignment */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | if (ralign < ARCH_SLAB_MINALIGN) { |
| 2268 | ralign = ARCH_SLAB_MINALIGN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | } |
Kevin Hilman | a44b56d | 2006-12-06 20:32:11 -0800 | [diff] [blame] | 2270 | /* 3) caller mandated alignment */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | if (ralign < align) { |
| 2272 | ralign = align; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | } |
Kevin Hilman | a44b56d | 2006-12-06 20:32:11 -0800 | [diff] [blame] | 2274 | /* disable debug if necessary */ |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 2275 | if (ralign > __alignof__(unsigned long long)) |
Kevin Hilman | a44b56d | 2006-12-06 20:32:11 -0800 | [diff] [blame] | 2276 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2277 | /* |
Pekka Enberg | ca5f970 | 2006-09-25 23:31:25 -0700 | [diff] [blame] | 2278 | * 4) Store it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | */ |
| 2280 | align = ralign; |
| 2281 | |
| 2282 | /* Get cache's description obj. */ |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 2283 | cachep = kmem_cache_zalloc(&cache_cache, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | if (!cachep) |
Andrew Morton | 4f12bb4 | 2005-11-07 00:58:00 -0800 | [diff] [blame] | 2285 | goto oops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | |
| 2287 | #if DEBUG |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 2288 | cachep->obj_size = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2289 | |
Pekka Enberg | ca5f970 | 2006-09-25 23:31:25 -0700 | [diff] [blame] | 2290 | /* |
| 2291 | * Both debugging options require word-alignment which is calculated |
| 2292 | * into align above. |
| 2293 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | if (flags & SLAB_RED_ZONE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | /* add space for red zone words */ |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 2296 | cachep->obj_offset += sizeof(unsigned long long); |
| 2297 | size += 2 * sizeof(unsigned long long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | } |
| 2299 | if (flags & SLAB_STORE_USER) { |
Pekka Enberg | ca5f970 | 2006-09-25 23:31:25 -0700 | [diff] [blame] | 2300 | /* user store requires one word storage behind the end of |
David Woodhouse | 87a927c | 2007-07-04 21:26:44 -0400 | [diff] [blame] | 2301 | * the real object. But if the second red zone needs to be |
| 2302 | * aligned to 64 bits, we must allow that much space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | */ |
David Woodhouse | 87a927c | 2007-07-04 21:26:44 -0400 | [diff] [blame] | 2304 | if (flags & SLAB_RED_ZONE) |
| 2305 | size += REDZONE_ALIGN; |
| 2306 | else |
| 2307 | size += BYTES_PER_WORD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | } |
| 2309 | #if FORCED_DEBUG && defined(CONFIG_DEBUG_PAGEALLOC) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2310 | if (size >= malloc_sizes[INDEX_L3 + 1].cs_size |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 2311 | && cachep->obj_size > cache_line_size() && size < PAGE_SIZE) { |
| 2312 | cachep->obj_offset += PAGE_SIZE - size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | size = PAGE_SIZE; |
| 2314 | } |
| 2315 | #endif |
| 2316 | #endif |
| 2317 | |
Ingo Molnar | e0a4272 | 2006-06-23 02:03:46 -0700 | [diff] [blame] | 2318 | /* |
| 2319 | * Determine if the slab management is 'on' or 'off' slab. |
| 2320 | * (bootstrapping cannot cope with offslab caches so don't do |
| 2321 | * it too early on.) |
| 2322 | */ |
| 2323 | if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | /* |
| 2325 | * Size is large, assume best to place the slab management obj |
| 2326 | * off-slab (should allow better packing of objs). |
| 2327 | */ |
| 2328 | flags |= CFLGS_OFF_SLAB; |
| 2329 | |
| 2330 | size = ALIGN(size, align); |
| 2331 | |
Linus Torvalds | f78bb8a | 2006-03-08 10:33:05 -0800 | [diff] [blame] | 2332 | left_over = calculate_slab_order(cachep, size, align, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | |
| 2334 | if (!cachep->num) { |
matze | b416952 | 2007-05-06 14:49:52 -0700 | [diff] [blame] | 2335 | printk(KERN_ERR |
| 2336 | "kmem_cache_create: couldn't create cache %s.\n", name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | kmem_cache_free(&cache_cache, cachep); |
| 2338 | cachep = NULL; |
Andrew Morton | 4f12bb4 | 2005-11-07 00:58:00 -0800 | [diff] [blame] | 2339 | goto oops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | } |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2341 | slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) |
| 2342 | + sizeof(struct slab), align); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | |
| 2344 | /* |
| 2345 | * If the slab has been placed off-slab, and we have enough space then |
| 2346 | * move it on-slab. This is at the expense of any extra colouring. |
| 2347 | */ |
| 2348 | if (flags & CFLGS_OFF_SLAB && left_over >= slab_size) { |
| 2349 | flags &= ~CFLGS_OFF_SLAB; |
| 2350 | left_over -= slab_size; |
| 2351 | } |
| 2352 | |
| 2353 | if (flags & CFLGS_OFF_SLAB) { |
| 2354 | /* really off slab. No need for manual alignment */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2355 | slab_size = |
| 2356 | cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | } |
| 2358 | |
| 2359 | cachep->colour_off = cache_line_size(); |
| 2360 | /* Offset must be a multiple of the alignment. */ |
| 2361 | if (cachep->colour_off < align) |
| 2362 | cachep->colour_off = align; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2363 | cachep->colour = left_over / cachep->colour_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | cachep->slab_size = slab_size; |
| 2365 | cachep->flags = flags; |
| 2366 | cachep->gfpflags = 0; |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 2367 | if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | cachep->gfpflags |= GFP_DMA; |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 2369 | cachep->buffer_size = size; |
Eric Dumazet | 6a2d7a9 | 2006-12-13 00:34:27 -0800 | [diff] [blame] | 2370 | cachep->reciprocal_buffer_size = reciprocal_value(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | |
Ravikiran G Thirumalai | e5ac9c5 | 2006-09-25 23:31:34 -0700 | [diff] [blame] | 2372 | if (flags & CFLGS_OFF_SLAB) { |
Victor Fusco | b2d5507 | 2005-09-10 00:26:36 -0700 | [diff] [blame] | 2373 | cachep->slabp_cache = kmem_find_general_cachep(slab_size, 0u); |
Ravikiran G Thirumalai | e5ac9c5 | 2006-09-25 23:31:34 -0700 | [diff] [blame] | 2374 | /* |
| 2375 | * This is a possibility for one of the malloc_sizes caches. |
| 2376 | * But since we go off slab only for object size greater than |
| 2377 | * PAGE_SIZE/8, and malloc_sizes gets created in ascending order, |
| 2378 | * this should not happen at all. |
| 2379 | * But leave a BUG_ON for some lucky dude. |
| 2380 | */ |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 2381 | BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache)); |
Ravikiran G Thirumalai | e5ac9c5 | 2006-09-25 23:31:34 -0700 | [diff] [blame] | 2382 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | cachep->ctor = ctor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | cachep->name = name; |
| 2385 | |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 2386 | if (setup_cpu_cache(cachep)) { |
| 2387 | __kmem_cache_destroy(cachep); |
| 2388 | cachep = NULL; |
| 2389 | goto oops; |
| 2390 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | /* cache setup completed, link it into the list */ |
| 2393 | list_add(&cachep->next, &cache_chain); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2394 | oops: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | if (!cachep && (flags & SLAB_PANIC)) |
| 2396 | panic("kmem_cache_create(): failed to create slab `%s'\n", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2397 | name); |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 2398 | mutex_unlock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | return cachep; |
| 2400 | } |
| 2401 | EXPORT_SYMBOL(kmem_cache_create); |
| 2402 | |
| 2403 | #if DEBUG |
| 2404 | static void check_irq_off(void) |
| 2405 | { |
| 2406 | BUG_ON(!irqs_disabled()); |
| 2407 | } |
| 2408 | |
| 2409 | static void check_irq_on(void) |
| 2410 | { |
| 2411 | BUG_ON(irqs_disabled()); |
| 2412 | } |
| 2413 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2414 | static void check_spinlock_acquired(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | { |
| 2416 | #ifdef CONFIG_SMP |
| 2417 | check_irq_off(); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2418 | assert_spin_locked(&cachep->nodelists[numa_node_id()]->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | #endif |
| 2420 | } |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2421 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2422 | static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2423 | { |
| 2424 | #ifdef CONFIG_SMP |
| 2425 | check_irq_off(); |
| 2426 | assert_spin_locked(&cachep->nodelists[node]->list_lock); |
| 2427 | #endif |
| 2428 | } |
| 2429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | #else |
| 2431 | #define check_irq_off() do { } while(0) |
| 2432 | #define check_irq_on() do { } while(0) |
| 2433 | #define check_spinlock_acquired(x) do { } while(0) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2434 | #define check_spinlock_acquired_node(x, y) do { } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | #endif |
| 2436 | |
Christoph Lameter | aab2207 | 2006-03-22 00:09:06 -0800 | [diff] [blame] | 2437 | static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, |
| 2438 | struct array_cache *ac, |
| 2439 | int force, int node); |
| 2440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | static void do_drain(void *arg) |
| 2442 | { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2443 | struct kmem_cache *cachep = arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | struct array_cache *ac; |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 2445 | int node = numa_node_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | |
| 2447 | check_irq_off(); |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 2448 | ac = cpu_cache_get(cachep); |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 2449 | spin_lock(&cachep->nodelists[node]->list_lock); |
| 2450 | free_block(cachep, ac->entry, ac->avail, node); |
| 2451 | spin_unlock(&cachep->nodelists[node]->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | ac->avail = 0; |
| 2453 | } |
| 2454 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2455 | static void drain_cpu_caches(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2457 | struct kmem_list3 *l3; |
| 2458 | int node; |
| 2459 | |
Andrew Morton | a07fa39 | 2006-03-22 00:08:17 -0800 | [diff] [blame] | 2460 | on_each_cpu(do_drain, cachep, 1, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | check_irq_on(); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2462 | for_each_online_node(node) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2463 | l3 = cachep->nodelists[node]; |
Roland Dreier | a4523a8 | 2006-05-15 11:41:00 -0700 | [diff] [blame] | 2464 | if (l3 && l3->alien) |
| 2465 | drain_alien_cache(cachep, l3->alien); |
| 2466 | } |
| 2467 | |
| 2468 | for_each_online_node(node) { |
| 2469 | l3 = cachep->nodelists[node]; |
| 2470 | if (l3) |
Christoph Lameter | aab2207 | 2006-03-22 00:09:06 -0800 | [diff] [blame] | 2471 | drain_array(cachep, l3, l3->shared, 1, node); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2472 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | } |
| 2474 | |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2475 | /* |
| 2476 | * Remove slabs from the list of free slabs. |
| 2477 | * Specify the number of slabs to drain in tofree. |
| 2478 | * |
| 2479 | * Returns the actual number of slabs released. |
| 2480 | */ |
| 2481 | static int drain_freelist(struct kmem_cache *cache, |
| 2482 | struct kmem_list3 *l3, int tofree) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2483 | { |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2484 | struct list_head *p; |
| 2485 | int nr_freed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | struct slab *slabp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2488 | nr_freed = 0; |
| 2489 | while (nr_freed < tofree && !list_empty(&l3->slabs_free)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2491 | spin_lock_irq(&l3->list_lock); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2492 | p = l3->slabs_free.prev; |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2493 | if (p == &l3->slabs_free) { |
| 2494 | spin_unlock_irq(&l3->list_lock); |
| 2495 | goto out; |
| 2496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2498 | slabp = list_entry(p, struct slab, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | #if DEBUG |
Eric Sesterhenn | 40094fa | 2006-04-02 13:49:25 +0200 | [diff] [blame] | 2500 | BUG_ON(slabp->inuse); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | #endif |
| 2502 | list_del(&slabp->list); |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2503 | /* |
| 2504 | * Safe to drop the lock. The slab is no longer linked |
| 2505 | * to the cache. |
| 2506 | */ |
| 2507 | l3->free_objects -= cache->num; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2508 | spin_unlock_irq(&l3->list_lock); |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2509 | slab_destroy(cache, slabp); |
| 2510 | nr_freed++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2511 | } |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2512 | out: |
| 2513 | return nr_freed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2514 | } |
| 2515 | |
Ravikiran G Thirumalai | 8f5be20 | 2006-12-06 20:32:14 -0800 | [diff] [blame] | 2516 | /* Called with cache_chain_mutex held to protect against cpu hotplug */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2517 | static int __cache_shrink(struct kmem_cache *cachep) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2518 | { |
| 2519 | int ret = 0, i = 0; |
| 2520 | struct kmem_list3 *l3; |
| 2521 | |
| 2522 | drain_cpu_caches(cachep); |
| 2523 | |
| 2524 | check_irq_on(); |
| 2525 | for_each_online_node(i) { |
| 2526 | l3 = cachep->nodelists[i]; |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 2527 | if (!l3) |
| 2528 | continue; |
| 2529 | |
| 2530 | drain_freelist(cachep, l3, l3->free_objects); |
| 2531 | |
| 2532 | ret += !list_empty(&l3->slabs_full) || |
| 2533 | !list_empty(&l3->slabs_partial); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2534 | } |
| 2535 | return (ret ? 1 : 0); |
| 2536 | } |
| 2537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2538 | /** |
| 2539 | * kmem_cache_shrink - Shrink a cache. |
| 2540 | * @cachep: The cache to shrink. |
| 2541 | * |
| 2542 | * Releases as many slabs as possible for a cache. |
| 2543 | * To help debugging, a zero exit status indicates all slabs were released. |
| 2544 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2545 | int kmem_cache_shrink(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2546 | { |
Ravikiran G Thirumalai | 8f5be20 | 2006-12-06 20:32:14 -0800 | [diff] [blame] | 2547 | int ret; |
Eric Sesterhenn | 40094fa | 2006-04-02 13:49:25 +0200 | [diff] [blame] | 2548 | BUG_ON(!cachep || in_interrupt()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2549 | |
Ravikiran G Thirumalai | 8f5be20 | 2006-12-06 20:32:14 -0800 | [diff] [blame] | 2550 | mutex_lock(&cache_chain_mutex); |
| 2551 | ret = __cache_shrink(cachep); |
| 2552 | mutex_unlock(&cache_chain_mutex); |
| 2553 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | } |
| 2555 | EXPORT_SYMBOL(kmem_cache_shrink); |
| 2556 | |
| 2557 | /** |
| 2558 | * kmem_cache_destroy - delete a cache |
| 2559 | * @cachep: the cache to destroy |
| 2560 | * |
Robert P. J. Day | 72fd4a3 | 2007-02-10 01:45:59 -0800 | [diff] [blame] | 2561 | * Remove a &struct kmem_cache object from the slab cache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | * |
| 2563 | * It is expected this function will be called by a module when it is |
| 2564 | * unloaded. This will remove the cache completely, and avoid a duplicate |
| 2565 | * cache being allocated each time a module is loaded and unloaded, if the |
| 2566 | * module doesn't have persistent in-kernel storage across loads and unloads. |
| 2567 | * |
| 2568 | * The cache must be empty before calling this function. |
| 2569 | * |
| 2570 | * The caller must guarantee that noone will allocate memory from the cache |
| 2571 | * during the kmem_cache_destroy(). |
| 2572 | */ |
Alexey Dobriyan | 133d205 | 2006-09-27 01:49:41 -0700 | [diff] [blame] | 2573 | void kmem_cache_destroy(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | { |
Eric Sesterhenn | 40094fa | 2006-04-02 13:49:25 +0200 | [diff] [blame] | 2575 | BUG_ON(!cachep || in_interrupt()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | /* Find the cache in the chain of caches. */ |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 2578 | mutex_lock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | /* |
| 2580 | * the chain is never empty, cache_cache is never destroyed |
| 2581 | */ |
| 2582 | list_del(&cachep->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | if (__cache_shrink(cachep)) { |
| 2584 | slab_error(cachep, "Can't free all objects"); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2585 | list_add(&cachep->next, &cache_chain); |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 2586 | mutex_unlock(&cache_chain_mutex); |
Alexey Dobriyan | 133d205 | 2006-09-27 01:49:41 -0700 | [diff] [blame] | 2587 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | } |
| 2589 | |
| 2590 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 2591 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | |
Christoph Lameter | 117f6eb | 2006-09-25 23:31:37 -0700 | [diff] [blame] | 2593 | __kmem_cache_destroy(cachep); |
Ravikiran G Thirumalai | 8f5be20 | 2006-12-06 20:32:14 -0800 | [diff] [blame] | 2594 | mutex_unlock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2595 | } |
| 2596 | EXPORT_SYMBOL(kmem_cache_destroy); |
| 2597 | |
Ravikiran G Thirumalai | e5ac9c5 | 2006-09-25 23:31:34 -0700 | [diff] [blame] | 2598 | /* |
| 2599 | * Get the memory for a slab management obj. |
| 2600 | * For a slab cache when the slab descriptor is off-slab, slab descriptors |
| 2601 | * always come from malloc_sizes caches. The slab descriptor cannot |
| 2602 | * come from the same cache which is getting created because, |
| 2603 | * when we are searching for an appropriate cache for these |
| 2604 | * descriptors in kmem_cache_create, we search through the malloc_sizes array. |
| 2605 | * If we are creating a malloc_sizes cache here it would not be visible to |
| 2606 | * kmem_find_general_cachep till the initialization is complete. |
| 2607 | * Hence we cannot have slabp_cache same as the original cache. |
| 2608 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2609 | static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp, |
Ravikiran G Thirumalai | 5b74ada | 2006-04-10 22:52:53 -0700 | [diff] [blame] | 2610 | int colour_off, gfp_t local_flags, |
| 2611 | int nodeid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2612 | { |
| 2613 | struct slab *slabp; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | if (OFF_SLAB(cachep)) { |
| 2616 | /* Slab management obj is off-slab. */ |
Ravikiran G Thirumalai | 5b74ada | 2006-04-10 22:52:53 -0700 | [diff] [blame] | 2617 | slabp = kmem_cache_alloc_node(cachep->slabp_cache, |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 2618 | local_flags & ~GFP_THISNODE, nodeid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2619 | if (!slabp) |
| 2620 | return NULL; |
| 2621 | } else { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2622 | slabp = objp + colour_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | colour_off += cachep->slab_size; |
| 2624 | } |
| 2625 | slabp->inuse = 0; |
| 2626 | slabp->colouroff = colour_off; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2627 | slabp->s_mem = objp + colour_off; |
Ravikiran G Thirumalai | 5b74ada | 2006-04-10 22:52:53 -0700 | [diff] [blame] | 2628 | slabp->nodeid = nodeid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | return slabp; |
| 2630 | } |
| 2631 | |
| 2632 | static inline kmem_bufctl_t *slab_bufctl(struct slab *slabp) |
| 2633 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2634 | return (kmem_bufctl_t *) (slabp + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2635 | } |
| 2636 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2637 | static void cache_init_objs(struct kmem_cache *cachep, |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 2638 | struct slab *slabp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | { |
| 2640 | int i; |
| 2641 | |
| 2642 | for (i = 0; i < cachep->num; i++) { |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 2643 | void *objp = index_to_obj(cachep, slabp, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | #if DEBUG |
| 2645 | /* need to poison the objs? */ |
| 2646 | if (cachep->flags & SLAB_POISON) |
| 2647 | poison_obj(cachep, objp, POISON_FREE); |
| 2648 | if (cachep->flags & SLAB_STORE_USER) |
| 2649 | *dbg_userword(cachep, objp) = NULL; |
| 2650 | |
| 2651 | if (cachep->flags & SLAB_RED_ZONE) { |
| 2652 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; |
| 2653 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; |
| 2654 | } |
| 2655 | /* |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2656 | * Constructors are not allowed to allocate memory from the same |
| 2657 | * cache which they are a constructor for. Otherwise, deadlock. |
| 2658 | * They must also be threaded. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2659 | */ |
| 2660 | if (cachep->ctor && !(cachep->flags & SLAB_POISON)) |
Christoph Lameter | 4ba9b9d | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 2661 | cachep->ctor(cachep, objp + obj_offset(cachep)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2662 | |
| 2663 | if (cachep->flags & SLAB_RED_ZONE) { |
| 2664 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) |
| 2665 | slab_error(cachep, "constructor overwrote the" |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2666 | " end of an object"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2667 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) |
| 2668 | slab_error(cachep, "constructor overwrote the" |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2669 | " start of an object"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | } |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2671 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && |
| 2672 | OFF_SLAB(cachep) && cachep->flags & SLAB_POISON) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2673 | kernel_map_pages(virt_to_page(objp), |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 2674 | cachep->buffer_size / PAGE_SIZE, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | #else |
| 2676 | if (cachep->ctor) |
Christoph Lameter | 4ba9b9d | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 2677 | cachep->ctor(cachep, objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2678 | #endif |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2679 | slab_bufctl(slabp)[i] = i + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2680 | } |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2681 | slab_bufctl(slabp)[i - 1] = BUFCTL_END; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2682 | slabp->free = 0; |
| 2683 | } |
| 2684 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2685 | static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2686 | { |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 2687 | if (CONFIG_ZONE_DMA_FLAG) { |
| 2688 | if (flags & GFP_DMA) |
| 2689 | BUG_ON(!(cachep->gfpflags & GFP_DMA)); |
| 2690 | else |
| 2691 | BUG_ON(cachep->gfpflags & GFP_DMA); |
| 2692 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | } |
| 2694 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2695 | static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, |
| 2696 | int nodeid) |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 2697 | { |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 2698 | void *objp = index_to_obj(cachep, slabp, slabp->free); |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 2699 | kmem_bufctl_t next; |
| 2700 | |
| 2701 | slabp->inuse++; |
| 2702 | next = slab_bufctl(slabp)[slabp->free]; |
| 2703 | #if DEBUG |
| 2704 | slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE; |
| 2705 | WARN_ON(slabp->nodeid != nodeid); |
| 2706 | #endif |
| 2707 | slabp->free = next; |
| 2708 | |
| 2709 | return objp; |
| 2710 | } |
| 2711 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2712 | static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, |
| 2713 | void *objp, int nodeid) |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 2714 | { |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 2715 | unsigned int objnr = obj_to_index(cachep, slabp, objp); |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 2716 | |
| 2717 | #if DEBUG |
| 2718 | /* Verify that the slab belongs to the intended node */ |
| 2719 | WARN_ON(slabp->nodeid != nodeid); |
| 2720 | |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 2721 | if (slab_bufctl(slabp)[objnr] + 1 <= SLAB_LIMIT + 1) { |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 2722 | printk(KERN_ERR "slab: double free detected in cache " |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2723 | "'%s', objp %p\n", cachep->name, objp); |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 2724 | BUG(); |
| 2725 | } |
| 2726 | #endif |
| 2727 | slab_bufctl(slabp)[objnr] = slabp->free; |
| 2728 | slabp->free = objnr; |
| 2729 | slabp->inuse--; |
| 2730 | } |
| 2731 | |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2732 | /* |
| 2733 | * Map pages beginning at addr to the given cache and slab. This is required |
| 2734 | * for the slab allocator to be able to lookup the cache and slab of a |
| 2735 | * virtual address for kfree, ksize, kmem_ptr_validate, and slab debugging. |
| 2736 | */ |
| 2737 | static void slab_map_pages(struct kmem_cache *cache, struct slab *slab, |
| 2738 | void *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2739 | { |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2740 | int nr_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2741 | struct page *page; |
| 2742 | |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2743 | page = virt_to_page(addr); |
Nick Piggin | 8409751 | 2006-03-22 00:08:34 -0800 | [diff] [blame] | 2744 | |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2745 | nr_pages = 1; |
Nick Piggin | 8409751 | 2006-03-22 00:08:34 -0800 | [diff] [blame] | 2746 | if (likely(!PageCompound(page))) |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2747 | nr_pages <<= cache->gfporder; |
| 2748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2749 | do { |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2750 | page_set_cache(page, cache); |
| 2751 | page_set_slab(page, slab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2752 | page++; |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2753 | } while (--nr_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | } |
| 2755 | |
| 2756 | /* |
| 2757 | * Grow (by 1) the number of slabs within a cache. This is called by |
| 2758 | * kmem_cache_alloc() when there are no active objs left in a cache. |
| 2759 | */ |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 2760 | static int cache_grow(struct kmem_cache *cachep, |
| 2761 | gfp_t flags, int nodeid, void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2762 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2763 | struct slab *slabp; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2764 | size_t offset; |
| 2765 | gfp_t local_flags; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2766 | struct kmem_list3 *l3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2767 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2768 | /* |
| 2769 | * Be lazy and only check for valid flags here, keeping it out of the |
| 2770 | * critical path in kmem_cache_alloc(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2771 | */ |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 2772 | BUG_ON(flags & GFP_SLAB_BUG_MASK); |
| 2773 | local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | |
Ravikiran G Thirumalai | 2e1217c | 2006-02-04 23:27:56 -0800 | [diff] [blame] | 2775 | /* Take the l3 list lock to change the colour_next on this node */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2776 | check_irq_off(); |
Ravikiran G Thirumalai | 2e1217c | 2006-02-04 23:27:56 -0800 | [diff] [blame] | 2777 | l3 = cachep->nodelists[nodeid]; |
| 2778 | spin_lock(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2779 | |
| 2780 | /* Get colour for the slab, and cal the next value. */ |
Ravikiran G Thirumalai | 2e1217c | 2006-02-04 23:27:56 -0800 | [diff] [blame] | 2781 | offset = l3->colour_next; |
| 2782 | l3->colour_next++; |
| 2783 | if (l3->colour_next >= cachep->colour) |
| 2784 | l3->colour_next = 0; |
| 2785 | spin_unlock(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | |
Ravikiran G Thirumalai | 2e1217c | 2006-02-04 23:27:56 -0800 | [diff] [blame] | 2787 | offset *= cachep->colour_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2788 | |
| 2789 | if (local_flags & __GFP_WAIT) |
| 2790 | local_irq_enable(); |
| 2791 | |
| 2792 | /* |
| 2793 | * The test for missing atomic flag is performed here, rather than |
| 2794 | * the more obvious place, simply to reduce the critical path length |
| 2795 | * in kmem_cache_alloc(). If a caller is seriously mis-behaving they |
| 2796 | * will eventually be caught here (where it matters). |
| 2797 | */ |
| 2798 | kmem_flagcheck(cachep, flags); |
| 2799 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2800 | /* |
| 2801 | * Get mem for the objs. Attempt to allocate a physical page from |
| 2802 | * 'nodeid'. |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2803 | */ |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 2804 | if (!objp) |
Andrew Morton | b8c1c5d | 2007-07-24 12:02:40 -0700 | [diff] [blame] | 2805 | objp = kmem_getpages(cachep, local_flags, nodeid); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2806 | if (!objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | goto failed; |
| 2808 | |
| 2809 | /* Get slab management. */ |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 2810 | slabp = alloc_slabmgmt(cachep, objp, offset, |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 2811 | local_flags & ~GFP_CONSTRAINT_MASK, nodeid); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2812 | if (!slabp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2813 | goto opps1; |
| 2814 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2815 | slabp->nodeid = nodeid; |
Pekka Enberg | 4776874 | 2006-06-23 02:03:07 -0700 | [diff] [blame] | 2816 | slab_map_pages(cachep, slabp, objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 2818 | cache_init_objs(cachep, slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2819 | |
| 2820 | if (local_flags & __GFP_WAIT) |
| 2821 | local_irq_disable(); |
| 2822 | check_irq_off(); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2823 | spin_lock(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | |
| 2825 | /* Make slab active. */ |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2826 | list_add_tail(&slabp->list, &(l3->slabs_free)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2827 | STATS_INC_GROWN(cachep); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2828 | l3->free_objects += cachep->num; |
| 2829 | spin_unlock(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2830 | return 1; |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2831 | opps1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2832 | kmem_freepages(cachep, objp); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2833 | failed: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2834 | if (local_flags & __GFP_WAIT) |
| 2835 | local_irq_disable(); |
| 2836 | return 0; |
| 2837 | } |
| 2838 | |
| 2839 | #if DEBUG |
| 2840 | |
| 2841 | /* |
| 2842 | * Perform extra freeing checks: |
| 2843 | * - detect bad pointers. |
| 2844 | * - POISON/RED_ZONE checking |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2845 | */ |
| 2846 | static void kfree_debugcheck(const void *objp) |
| 2847 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | if (!virt_addr_valid(objp)) { |
| 2849 | printk(KERN_ERR "kfree_debugcheck: out of range ptr %lxh.\n", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2850 | (unsigned long)objp); |
| 2851 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2852 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2853 | } |
| 2854 | |
Pekka Enberg | 58ce1fd | 2006-06-23 02:03:24 -0700 | [diff] [blame] | 2855 | static inline void verify_redzone_free(struct kmem_cache *cache, void *obj) |
| 2856 | { |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 2857 | unsigned long long redzone1, redzone2; |
Pekka Enberg | 58ce1fd | 2006-06-23 02:03:24 -0700 | [diff] [blame] | 2858 | |
| 2859 | redzone1 = *dbg_redzone1(cache, obj); |
| 2860 | redzone2 = *dbg_redzone2(cache, obj); |
| 2861 | |
| 2862 | /* |
| 2863 | * Redzone is ok. |
| 2864 | */ |
| 2865 | if (redzone1 == RED_ACTIVE && redzone2 == RED_ACTIVE) |
| 2866 | return; |
| 2867 | |
| 2868 | if (redzone1 == RED_INACTIVE && redzone2 == RED_INACTIVE) |
| 2869 | slab_error(cache, "double free detected"); |
| 2870 | else |
| 2871 | slab_error(cache, "memory outside object was overwritten"); |
| 2872 | |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 2873 | printk(KERN_ERR "%p: redzone 1:0x%llx, redzone 2:0x%llx.\n", |
Pekka Enberg | 58ce1fd | 2006-06-23 02:03:24 -0700 | [diff] [blame] | 2874 | obj, redzone1, redzone2); |
| 2875 | } |
| 2876 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2877 | static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2878 | void *caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2879 | { |
| 2880 | struct page *page; |
| 2881 | unsigned int objnr; |
| 2882 | struct slab *slabp; |
| 2883 | |
Matthew Wilcox | 80cbd91 | 2007-11-29 12:05:13 -0700 | [diff] [blame] | 2884 | BUG_ON(virt_to_cache(objp) != cachep); |
| 2885 | |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 2886 | objp -= obj_offset(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | kfree_debugcheck(objp); |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 2888 | page = virt_to_head_page(objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | |
Pekka Enberg | 065d41c | 2005-11-13 16:06:46 -0800 | [diff] [blame] | 2890 | slabp = page_get_slab(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2891 | |
| 2892 | if (cachep->flags & SLAB_RED_ZONE) { |
Pekka Enberg | 58ce1fd | 2006-06-23 02:03:24 -0700 | [diff] [blame] | 2893 | verify_redzone_free(cachep, objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; |
| 2895 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; |
| 2896 | } |
| 2897 | if (cachep->flags & SLAB_STORE_USER) |
| 2898 | *dbg_userword(cachep, objp) = caller; |
| 2899 | |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 2900 | objnr = obj_to_index(cachep, slabp, objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | |
| 2902 | BUG_ON(objnr >= cachep->num); |
Pekka Enberg | 8fea4e9 | 2006-03-22 00:08:10 -0800 | [diff] [blame] | 2903 | BUG_ON(objp != index_to_obj(cachep, slabp, objnr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 2905 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
| 2906 | slab_bufctl(slabp)[objnr] = BUFCTL_FREE; |
| 2907 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2908 | if (cachep->flags & SLAB_POISON) { |
| 2909 | #ifdef CONFIG_DEBUG_PAGEALLOC |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2910 | if ((cachep->buffer_size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2911 | store_stackinfo(cachep, objp, (unsigned long)caller); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2912 | kernel_map_pages(virt_to_page(objp), |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 2913 | cachep->buffer_size / PAGE_SIZE, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2914 | } else { |
| 2915 | poison_obj(cachep, objp, POISON_FREE); |
| 2916 | } |
| 2917 | #else |
| 2918 | poison_obj(cachep, objp, POISON_FREE); |
| 2919 | #endif |
| 2920 | } |
| 2921 | return objp; |
| 2922 | } |
| 2923 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2924 | static void check_slabp(struct kmem_cache *cachep, struct slab *slabp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | { |
| 2926 | kmem_bufctl_t i; |
| 2927 | int entries = 0; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2928 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2929 | /* Check slab's freelist to see if this obj is there. */ |
| 2930 | for (i = slabp->free; i != BUFCTL_END; i = slab_bufctl(slabp)[i]) { |
| 2931 | entries++; |
| 2932 | if (entries > cachep->num || i >= cachep->num) |
| 2933 | goto bad; |
| 2934 | } |
| 2935 | if (entries != cachep->num - slabp->inuse) { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2936 | bad: |
| 2937 | printk(KERN_ERR "slab: Internal list corruption detected in " |
| 2938 | "cache '%s'(%d), slabp %p(%d). Hexdump:\n", |
| 2939 | cachep->name, cachep->num, slabp, slabp->inuse); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2940 | for (i = 0; |
Linus Torvalds | 264132b | 2006-03-06 12:10:07 -0800 | [diff] [blame] | 2941 | i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2942 | i++) { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2943 | if (i % 16 == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | printk("\n%03x:", i); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 2945 | printk(" %02x", ((unsigned char *)slabp)[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2946 | } |
| 2947 | printk("\n"); |
| 2948 | BUG(); |
| 2949 | } |
| 2950 | } |
| 2951 | #else |
| 2952 | #define kfree_debugcheck(x) do { } while(0) |
| 2953 | #define cache_free_debugcheck(x,objp,z) (objp) |
| 2954 | #define check_slabp(x,y) do { } while(0) |
| 2955 | #endif |
| 2956 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 2957 | static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2958 | { |
| 2959 | int batchcount; |
| 2960 | struct kmem_list3 *l3; |
| 2961 | struct array_cache *ac; |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 2962 | int node; |
| 2963 | |
| 2964 | node = numa_node_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2965 | |
| 2966 | check_irq_off(); |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 2967 | ac = cpu_cache_get(cachep); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2968 | retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2969 | batchcount = ac->batchcount; |
| 2970 | if (!ac->touched && batchcount > BATCHREFILL_LIMIT) { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 2971 | /* |
| 2972 | * If there was little recent activity on this cache, then |
| 2973 | * perform only a partial refill. Otherwise we could generate |
| 2974 | * refill bouncing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2975 | */ |
| 2976 | batchcount = BATCHREFILL_LIMIT; |
| 2977 | } |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 2978 | l3 = cachep->nodelists[node]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 2980 | BUG_ON(ac->avail > 0 || !l3); |
| 2981 | spin_lock(&l3->list_lock); |
| 2982 | |
Christoph Lameter | 3ded175 | 2006-03-25 03:06:44 -0800 | [diff] [blame] | 2983 | /* See if we can refill from the shared array */ |
| 2984 | if (l3->shared && transfer_objects(ac, l3->shared, batchcount)) |
| 2985 | goto alloc_done; |
| 2986 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2987 | while (batchcount > 0) { |
| 2988 | struct list_head *entry; |
| 2989 | struct slab *slabp; |
| 2990 | /* Get slab alloc is to come from. */ |
| 2991 | entry = l3->slabs_partial.next; |
| 2992 | if (entry == &l3->slabs_partial) { |
| 2993 | l3->free_touched = 1; |
| 2994 | entry = l3->slabs_free.next; |
| 2995 | if (entry == &l3->slabs_free) |
| 2996 | goto must_grow; |
| 2997 | } |
| 2998 | |
| 2999 | slabp = list_entry(entry, struct slab, list); |
| 3000 | check_slabp(cachep, slabp); |
| 3001 | check_spinlock_acquired(cachep); |
Pekka Enberg | 714b8171 | 2007-05-06 14:49:03 -0700 | [diff] [blame] | 3002 | |
| 3003 | /* |
| 3004 | * The slab was either on partial or free list so |
| 3005 | * there must be at least one object available for |
| 3006 | * allocation. |
| 3007 | */ |
| 3008 | BUG_ON(slabp->inuse < 0 || slabp->inuse >= cachep->num); |
| 3009 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | while (slabp->inuse < cachep->num && batchcount--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3011 | STATS_INC_ALLOCED(cachep); |
| 3012 | STATS_INC_ACTIVE(cachep); |
| 3013 | STATS_SET_HIGH(cachep); |
| 3014 | |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 3015 | ac->entry[ac->avail++] = slab_get_obj(cachep, slabp, |
Pekka Enberg | 1ca4cb2 | 2006-10-06 00:43:52 -0700 | [diff] [blame] | 3016 | node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3017 | } |
| 3018 | check_slabp(cachep, slabp); |
| 3019 | |
| 3020 | /* move slabp to correct slabp list: */ |
| 3021 | list_del(&slabp->list); |
| 3022 | if (slabp->free == BUFCTL_END) |
| 3023 | list_add(&slabp->list, &l3->slabs_full); |
| 3024 | else |
| 3025 | list_add(&slabp->list, &l3->slabs_partial); |
| 3026 | } |
| 3027 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3028 | must_grow: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | l3->free_objects -= ac->avail; |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3030 | alloc_done: |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3031 | spin_unlock(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3032 | |
| 3033 | if (unlikely(!ac->avail)) { |
| 3034 | int x; |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3035 | x = cache_grow(cachep, flags | GFP_THISNODE, node, NULL); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3036 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3037 | /* cache_grow can reenable interrupts, then ac could change. */ |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 3038 | ac = cpu_cache_get(cachep); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3039 | if (!x && ac->avail == 0) /* no objects in sight? abort */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3040 | return NULL; |
| 3041 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3042 | if (!ac->avail) /* objects refilled by interrupt? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | goto retry; |
| 3044 | } |
| 3045 | ac->touched = 1; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3046 | return ac->entry[--ac->avail]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3047 | } |
| 3048 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3049 | static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep, |
| 3050 | gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3051 | { |
| 3052 | might_sleep_if(flags & __GFP_WAIT); |
| 3053 | #if DEBUG |
| 3054 | kmem_flagcheck(cachep, flags); |
| 3055 | #endif |
| 3056 | } |
| 3057 | |
| 3058 | #if DEBUG |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3059 | static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, |
| 3060 | gfp_t flags, void *objp, void *caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3061 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3062 | if (!objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3063 | return objp; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3064 | if (cachep->flags & SLAB_POISON) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3065 | #ifdef CONFIG_DEBUG_PAGEALLOC |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3066 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3067 | kernel_map_pages(virt_to_page(objp), |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3068 | cachep->buffer_size / PAGE_SIZE, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3069 | else |
| 3070 | check_poison_obj(cachep, objp); |
| 3071 | #else |
| 3072 | check_poison_obj(cachep, objp); |
| 3073 | #endif |
| 3074 | poison_obj(cachep, objp, POISON_INUSE); |
| 3075 | } |
| 3076 | if (cachep->flags & SLAB_STORE_USER) |
| 3077 | *dbg_userword(cachep, objp) = caller; |
| 3078 | |
| 3079 | if (cachep->flags & SLAB_RED_ZONE) { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3080 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE || |
| 3081 | *dbg_redzone2(cachep, objp) != RED_INACTIVE) { |
| 3082 | slab_error(cachep, "double free, or memory outside" |
| 3083 | " object was overwritten"); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3084 | printk(KERN_ERR |
David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 3085 | "%p: redzone 1:0x%llx, redzone 2:0x%llx\n", |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3086 | objp, *dbg_redzone1(cachep, objp), |
| 3087 | *dbg_redzone2(cachep, objp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3088 | } |
| 3089 | *dbg_redzone1(cachep, objp) = RED_ACTIVE; |
| 3090 | *dbg_redzone2(cachep, objp) = RED_ACTIVE; |
| 3091 | } |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 3092 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
| 3093 | { |
| 3094 | struct slab *slabp; |
| 3095 | unsigned objnr; |
| 3096 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 3097 | slabp = page_get_slab(virt_to_head_page(objp)); |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 3098 | objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size; |
| 3099 | slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE; |
| 3100 | } |
| 3101 | #endif |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3102 | objp += obj_offset(cachep); |
Christoph Lameter | 4f10493 | 2007-05-06 14:50:17 -0700 | [diff] [blame] | 3103 | if (cachep->ctor && cachep->flags & SLAB_POISON) |
Christoph Lameter | 4ba9b9d | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 3104 | cachep->ctor(cachep, objp); |
Kevin Hilman | a44b56d | 2006-12-06 20:32:11 -0800 | [diff] [blame] | 3105 | #if ARCH_SLAB_MINALIGN |
| 3106 | if ((u32)objp & (ARCH_SLAB_MINALIGN-1)) { |
| 3107 | printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n", |
| 3108 | objp, ARCH_SLAB_MINALIGN); |
| 3109 | } |
| 3110 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3111 | return objp; |
| 3112 | } |
| 3113 | #else |
| 3114 | #define cache_alloc_debugcheck_after(a,b,objp,d) (objp) |
| 3115 | #endif |
| 3116 | |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 3117 | #ifdef CONFIG_FAILSLAB |
| 3118 | |
| 3119 | static struct failslab_attr { |
| 3120 | |
| 3121 | struct fault_attr attr; |
| 3122 | |
| 3123 | u32 ignore_gfp_wait; |
| 3124 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS |
| 3125 | struct dentry *ignore_gfp_wait_file; |
| 3126 | #endif |
| 3127 | |
| 3128 | } failslab = { |
| 3129 | .attr = FAULT_ATTR_INITIALIZER, |
Don Mullis | 6b1b60f | 2006-12-08 02:39:53 -0800 | [diff] [blame] | 3130 | .ignore_gfp_wait = 1, |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 3131 | }; |
| 3132 | |
| 3133 | static int __init setup_failslab(char *str) |
| 3134 | { |
| 3135 | return setup_fault_attr(&failslab.attr, str); |
| 3136 | } |
| 3137 | __setup("failslab=", setup_failslab); |
| 3138 | |
| 3139 | static int should_failslab(struct kmem_cache *cachep, gfp_t flags) |
| 3140 | { |
| 3141 | if (cachep == &cache_cache) |
| 3142 | return 0; |
| 3143 | if (flags & __GFP_NOFAIL) |
| 3144 | return 0; |
| 3145 | if (failslab.ignore_gfp_wait && (flags & __GFP_WAIT)) |
| 3146 | return 0; |
| 3147 | |
| 3148 | return should_fail(&failslab.attr, obj_size(cachep)); |
| 3149 | } |
| 3150 | |
| 3151 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS |
| 3152 | |
| 3153 | static int __init failslab_debugfs(void) |
| 3154 | { |
| 3155 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
| 3156 | struct dentry *dir; |
| 3157 | int err; |
| 3158 | |
Akinobu Mita | 824ebef | 2007-05-06 14:49:58 -0700 | [diff] [blame] | 3159 | err = init_fault_attr_dentries(&failslab.attr, "failslab"); |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 3160 | if (err) |
| 3161 | return err; |
| 3162 | dir = failslab.attr.dentries.dir; |
| 3163 | |
| 3164 | failslab.ignore_gfp_wait_file = |
| 3165 | debugfs_create_bool("ignore-gfp-wait", mode, dir, |
| 3166 | &failslab.ignore_gfp_wait); |
| 3167 | |
| 3168 | if (!failslab.ignore_gfp_wait_file) { |
| 3169 | err = -ENOMEM; |
| 3170 | debugfs_remove(failslab.ignore_gfp_wait_file); |
| 3171 | cleanup_fault_attr_dentries(&failslab.attr); |
| 3172 | } |
| 3173 | |
| 3174 | return err; |
| 3175 | } |
| 3176 | |
| 3177 | late_initcall(failslab_debugfs); |
| 3178 | |
| 3179 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |
| 3180 | |
| 3181 | #else /* CONFIG_FAILSLAB */ |
| 3182 | |
| 3183 | static inline int should_failslab(struct kmem_cache *cachep, gfp_t flags) |
| 3184 | { |
| 3185 | return 0; |
| 3186 | } |
| 3187 | |
| 3188 | #endif /* CONFIG_FAILSLAB */ |
| 3189 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3190 | static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3191 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3192 | void *objp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3193 | struct array_cache *ac; |
| 3194 | |
Alok N Kataria | 5c38230 | 2005-09-27 21:45:46 -0700 | [diff] [blame] | 3195 | check_irq_off(); |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 3196 | |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 3197 | ac = cpu_cache_get(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3198 | if (likely(ac->avail)) { |
| 3199 | STATS_INC_ALLOCHIT(cachep); |
| 3200 | ac->touched = 1; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3201 | objp = ac->entry[--ac->avail]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3202 | } else { |
| 3203 | STATS_INC_ALLOCMISS(cachep); |
| 3204 | objp = cache_alloc_refill(cachep, flags); |
| 3205 | } |
Alok N Kataria | 5c38230 | 2005-09-27 21:45:46 -0700 | [diff] [blame] | 3206 | return objp; |
| 3207 | } |
| 3208 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3209 | #ifdef CONFIG_NUMA |
| 3210 | /* |
Paul Jackson | b245539 | 2006-03-24 03:16:12 -0800 | [diff] [blame] | 3211 | * Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY. |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 3212 | * |
| 3213 | * If we are in_interrupt, then process context, including cpusets and |
| 3214 | * mempolicy, may not apply and should not be used for allocation policy. |
| 3215 | */ |
| 3216 | static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) |
| 3217 | { |
| 3218 | int nid_alloc, nid_here; |
| 3219 | |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3220 | if (in_interrupt() || (flags & __GFP_THISNODE)) |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 3221 | return NULL; |
| 3222 | nid_alloc = nid_here = numa_node_id(); |
| 3223 | if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD)) |
| 3224 | nid_alloc = cpuset_mem_spread_node(); |
| 3225 | else if (current->mempolicy) |
| 3226 | nid_alloc = slab_node(current->mempolicy); |
| 3227 | if (nid_alloc != nid_here) |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 3228 | return ____cache_alloc_node(cachep, flags, nid_alloc); |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 3229 | return NULL; |
| 3230 | } |
| 3231 | |
| 3232 | /* |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3233 | * Fallback function if there was no memory available and no objects on a |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3234 | * certain node and fall back is permitted. First we scan all the |
| 3235 | * available nodelists for available objects. If that fails then we |
| 3236 | * perform an allocation without specifying a node. This allows the page |
| 3237 | * allocator to do its reclaim / fallback magic. We then insert the |
| 3238 | * slab into the proper nodelist and then allocate from it. |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3239 | */ |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3240 | static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3241 | { |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3242 | struct zonelist *zonelist; |
| 3243 | gfp_t local_flags; |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3244 | struct zone **z; |
| 3245 | void *obj = NULL; |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3246 | int nid; |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3247 | |
| 3248 | if (flags & __GFP_THISNODE) |
| 3249 | return NULL; |
| 3250 | |
| 3251 | zonelist = &NODE_DATA(slab_node(current->mempolicy)) |
| 3252 | ->node_zonelists[gfp_zone(flags)]; |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 3253 | local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK); |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3254 | |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3255 | retry: |
| 3256 | /* |
| 3257 | * Look through allowed nodes for objects available |
| 3258 | * from existing per node queues. |
| 3259 | */ |
Christoph Lameter | aedb0eb | 2006-10-21 10:24:16 -0700 | [diff] [blame] | 3260 | for (z = zonelist->zones; *z && !obj; z++) { |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3261 | nid = zone_to_nid(*z); |
Christoph Lameter | aedb0eb | 2006-10-21 10:24:16 -0700 | [diff] [blame] | 3262 | |
Paul Jackson | 02a0e53 | 2006-12-13 00:34:25 -0800 | [diff] [blame] | 3263 | if (cpuset_zone_allowed_hardwall(*z, flags) && |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3264 | cache->nodelists[nid] && |
| 3265 | cache->nodelists[nid]->free_objects) |
| 3266 | obj = ____cache_alloc_node(cache, |
| 3267 | flags | GFP_THISNODE, nid); |
| 3268 | } |
| 3269 | |
Christoph Lameter | cfce660 | 2007-05-06 14:50:17 -0700 | [diff] [blame] | 3270 | if (!obj) { |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3271 | /* |
| 3272 | * This allocation will be performed within the constraints |
| 3273 | * of the current cpuset / memory policy requirements. |
| 3274 | * We may trigger various forms of reclaim on the allowed |
| 3275 | * set and go into memory reserves if necessary. |
| 3276 | */ |
Christoph Lameter | dd47ea7 | 2006-12-13 00:34:11 -0800 | [diff] [blame] | 3277 | if (local_flags & __GFP_WAIT) |
| 3278 | local_irq_enable(); |
| 3279 | kmem_flagcheck(cache, flags); |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3280 | obj = kmem_getpages(cache, flags, -1); |
Christoph Lameter | dd47ea7 | 2006-12-13 00:34:11 -0800 | [diff] [blame] | 3281 | if (local_flags & __GFP_WAIT) |
| 3282 | local_irq_disable(); |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3283 | if (obj) { |
| 3284 | /* |
| 3285 | * Insert into the appropriate per node queues |
| 3286 | */ |
| 3287 | nid = page_to_nid(virt_to_page(obj)); |
| 3288 | if (cache_grow(cache, flags, nid, obj)) { |
| 3289 | obj = ____cache_alloc_node(cache, |
| 3290 | flags | GFP_THISNODE, nid); |
| 3291 | if (!obj) |
| 3292 | /* |
| 3293 | * Another processor may allocate the |
| 3294 | * objects in the slab since we are |
| 3295 | * not holding any locks. |
| 3296 | */ |
| 3297 | goto retry; |
| 3298 | } else { |
Hugh Dickins | b6a6045 | 2007-01-05 16:36:36 -0800 | [diff] [blame] | 3299 | /* cache_grow already freed obj */ |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3300 | obj = NULL; |
| 3301 | } |
| 3302 | } |
Christoph Lameter | aedb0eb | 2006-10-21 10:24:16 -0700 | [diff] [blame] | 3303 | } |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3304 | return obj; |
| 3305 | } |
| 3306 | |
| 3307 | /* |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3308 | * A interface to enable slab creation on nodeid |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3309 | */ |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 3310 | static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3311 | int nodeid) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3312 | { |
| 3313 | struct list_head *entry; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3314 | struct slab *slabp; |
| 3315 | struct kmem_list3 *l3; |
| 3316 | void *obj; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3317 | int x; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3318 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3319 | l3 = cachep->nodelists[nodeid]; |
| 3320 | BUG_ON(!l3); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3321 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3322 | retry: |
Ravikiran G Thirumalai | ca3b9b9 | 2006-02-04 23:27:58 -0800 | [diff] [blame] | 3323 | check_irq_off(); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3324 | spin_lock(&l3->list_lock); |
| 3325 | entry = l3->slabs_partial.next; |
| 3326 | if (entry == &l3->slabs_partial) { |
| 3327 | l3->free_touched = 1; |
| 3328 | entry = l3->slabs_free.next; |
| 3329 | if (entry == &l3->slabs_free) |
| 3330 | goto must_grow; |
| 3331 | } |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3332 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3333 | slabp = list_entry(entry, struct slab, list); |
| 3334 | check_spinlock_acquired_node(cachep, nodeid); |
| 3335 | check_slabp(cachep, slabp); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3336 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3337 | STATS_INC_NODEALLOCS(cachep); |
| 3338 | STATS_INC_ACTIVE(cachep); |
| 3339 | STATS_SET_HIGH(cachep); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3340 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3341 | BUG_ON(slabp->inuse == cachep->num); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3342 | |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 3343 | obj = slab_get_obj(cachep, slabp, nodeid); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3344 | check_slabp(cachep, slabp); |
| 3345 | l3->free_objects--; |
| 3346 | /* move slabp to correct slabp list: */ |
| 3347 | list_del(&slabp->list); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3348 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3349 | if (slabp->free == BUFCTL_END) |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3350 | list_add(&slabp->list, &l3->slabs_full); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3351 | else |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3352 | list_add(&slabp->list, &l3->slabs_partial); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3353 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3354 | spin_unlock(&l3->list_lock); |
| 3355 | goto done; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3356 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3357 | must_grow: |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3358 | spin_unlock(&l3->list_lock); |
Christoph Lameter | 3c517a6 | 2006-12-06 20:33:29 -0800 | [diff] [blame] | 3359 | x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL); |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3360 | if (x) |
| 3361 | goto retry; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3362 | |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3363 | return fallback_alloc(cachep, flags); |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 3364 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3365 | done: |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3366 | return obj; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3367 | } |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3368 | |
| 3369 | /** |
| 3370 | * kmem_cache_alloc_node - Allocate an object on the specified node |
| 3371 | * @cachep: The cache to allocate from. |
| 3372 | * @flags: See kmalloc(). |
| 3373 | * @nodeid: node number of the target node. |
| 3374 | * @caller: return address of caller, used for debug information |
| 3375 | * |
| 3376 | * Identical to kmem_cache_alloc but it will allocate memory on the given |
| 3377 | * node, which can improve the performance for cpu bound structures. |
| 3378 | * |
| 3379 | * Fallback to other node is possible if __GFP_THISNODE is not set. |
| 3380 | */ |
| 3381 | static __always_inline void * |
| 3382 | __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid, |
| 3383 | void *caller) |
| 3384 | { |
| 3385 | unsigned long save_flags; |
| 3386 | void *ptr; |
| 3387 | |
Akinobu Mita | 824ebef | 2007-05-06 14:49:58 -0700 | [diff] [blame] | 3388 | if (should_failslab(cachep, flags)) |
| 3389 | return NULL; |
| 3390 | |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3391 | cache_alloc_debugcheck_before(cachep, flags); |
| 3392 | local_irq_save(save_flags); |
| 3393 | |
| 3394 | if (unlikely(nodeid == -1)) |
| 3395 | nodeid = numa_node_id(); |
| 3396 | |
| 3397 | if (unlikely(!cachep->nodelists[nodeid])) { |
| 3398 | /* Node not bootstrapped yet */ |
| 3399 | ptr = fallback_alloc(cachep, flags); |
| 3400 | goto out; |
| 3401 | } |
| 3402 | |
| 3403 | if (nodeid == numa_node_id()) { |
| 3404 | /* |
| 3405 | * Use the locally cached objects if possible. |
| 3406 | * However ____cache_alloc does not allow fallback |
| 3407 | * to other nodes. It may fail while we still have |
| 3408 | * objects on other nodes available. |
| 3409 | */ |
| 3410 | ptr = ____cache_alloc(cachep, flags); |
| 3411 | if (ptr) |
| 3412 | goto out; |
| 3413 | } |
| 3414 | /* ___cache_alloc_node can fall back to other nodes */ |
| 3415 | ptr = ____cache_alloc_node(cachep, flags, nodeid); |
| 3416 | out: |
| 3417 | local_irq_restore(save_flags); |
| 3418 | ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller); |
| 3419 | |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 3420 | if (unlikely((flags & __GFP_ZERO) && ptr)) |
| 3421 | memset(ptr, 0, obj_size(cachep)); |
| 3422 | |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3423 | return ptr; |
| 3424 | } |
| 3425 | |
| 3426 | static __always_inline void * |
| 3427 | __do_cache_alloc(struct kmem_cache *cache, gfp_t flags) |
| 3428 | { |
| 3429 | void *objp; |
| 3430 | |
| 3431 | if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { |
| 3432 | objp = alternate_node_alloc(cache, flags); |
| 3433 | if (objp) |
| 3434 | goto out; |
| 3435 | } |
| 3436 | objp = ____cache_alloc(cache, flags); |
| 3437 | |
| 3438 | /* |
| 3439 | * We may just have run out of memory on the local node. |
| 3440 | * ____cache_alloc_node() knows how to locate memory on other nodes |
| 3441 | */ |
| 3442 | if (!objp) |
| 3443 | objp = ____cache_alloc_node(cache, flags, numa_node_id()); |
| 3444 | |
| 3445 | out: |
| 3446 | return objp; |
| 3447 | } |
| 3448 | #else |
| 3449 | |
| 3450 | static __always_inline void * |
| 3451 | __do_cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
| 3452 | { |
| 3453 | return ____cache_alloc(cachep, flags); |
| 3454 | } |
| 3455 | |
| 3456 | #endif /* CONFIG_NUMA */ |
| 3457 | |
| 3458 | static __always_inline void * |
| 3459 | __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller) |
| 3460 | { |
| 3461 | unsigned long save_flags; |
| 3462 | void *objp; |
| 3463 | |
Akinobu Mita | 824ebef | 2007-05-06 14:49:58 -0700 | [diff] [blame] | 3464 | if (should_failslab(cachep, flags)) |
| 3465 | return NULL; |
| 3466 | |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3467 | cache_alloc_debugcheck_before(cachep, flags); |
| 3468 | local_irq_save(save_flags); |
| 3469 | objp = __do_cache_alloc(cachep, flags); |
| 3470 | local_irq_restore(save_flags); |
| 3471 | objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); |
| 3472 | prefetchw(objp); |
| 3473 | |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 3474 | if (unlikely((flags & __GFP_ZERO) && objp)) |
| 3475 | memset(objp, 0, obj_size(cachep)); |
| 3476 | |
Pekka Enberg | 8c8cc2c | 2007-02-10 01:42:53 -0800 | [diff] [blame] | 3477 | return objp; |
| 3478 | } |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3479 | |
| 3480 | /* |
| 3481 | * Caller needs to acquire correct kmem_list's list_lock |
| 3482 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3483 | static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3484 | int node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3485 | { |
| 3486 | int i; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3487 | struct kmem_list3 *l3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3488 | |
| 3489 | for (i = 0; i < nr_objects; i++) { |
| 3490 | void *objp = objpp[i]; |
| 3491 | struct slab *slabp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3492 | |
Pekka Enberg | 6ed5eb221 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 3493 | slabp = virt_to_slab(objp); |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 3494 | l3 = cachep->nodelists[node]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3495 | list_del(&slabp->list); |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 3496 | check_spinlock_acquired_node(cachep, node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3497 | check_slabp(cachep, slabp); |
Matthew Dobson | 78d382d | 2006-02-01 03:05:47 -0800 | [diff] [blame] | 3498 | slab_put_obj(cachep, slabp, objp, node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3499 | STATS_DEC_ACTIVE(cachep); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3500 | l3->free_objects++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3501 | check_slabp(cachep, slabp); |
| 3502 | |
| 3503 | /* fixup slab chains */ |
| 3504 | if (slabp->inuse == 0) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3505 | if (l3->free_objects > l3->free_limit) { |
| 3506 | l3->free_objects -= cachep->num; |
Ravikiran G Thirumalai | e5ac9c5 | 2006-09-25 23:31:34 -0700 | [diff] [blame] | 3507 | /* No need to drop any previously held |
| 3508 | * lock here, even if we have a off-slab slab |
| 3509 | * descriptor it is guaranteed to come from |
| 3510 | * a different cache, refer to comments before |
| 3511 | * alloc_slabmgmt. |
| 3512 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3513 | slab_destroy(cachep, slabp); |
| 3514 | } else { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3515 | list_add(&slabp->list, &l3->slabs_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3516 | } |
| 3517 | } else { |
| 3518 | /* Unconditionally move a slab to the end of the |
| 3519 | * partial list on free - maximum time for the |
| 3520 | * other objects to be freed, too. |
| 3521 | */ |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3522 | list_add_tail(&slabp->list, &l3->slabs_partial); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3523 | } |
| 3524 | } |
| 3525 | } |
| 3526 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3527 | static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3528 | { |
| 3529 | int batchcount; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3530 | struct kmem_list3 *l3; |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 3531 | int node = numa_node_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3532 | |
| 3533 | batchcount = ac->batchcount; |
| 3534 | #if DEBUG |
| 3535 | BUG_ON(!batchcount || batchcount > ac->avail); |
| 3536 | #endif |
| 3537 | check_irq_off(); |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 3538 | l3 = cachep->nodelists[node]; |
Ingo Molnar | 873623d | 2006-07-13 14:44:38 +0200 | [diff] [blame] | 3539 | spin_lock(&l3->list_lock); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3540 | if (l3->shared) { |
| 3541 | struct array_cache *shared_array = l3->shared; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3542 | int max = shared_array->limit - shared_array->avail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3543 | if (max) { |
| 3544 | if (batchcount > max) |
| 3545 | batchcount = max; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3546 | memcpy(&(shared_array->entry[shared_array->avail]), |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3547 | ac->entry, sizeof(void *) * batchcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3548 | shared_array->avail += batchcount; |
| 3549 | goto free_done; |
| 3550 | } |
| 3551 | } |
| 3552 | |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 3553 | free_block(cachep, ac->entry, batchcount, node); |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3554 | free_done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3555 | #if STATS |
| 3556 | { |
| 3557 | int i = 0; |
| 3558 | struct list_head *p; |
| 3559 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3560 | p = l3->slabs_free.next; |
| 3561 | while (p != &(l3->slabs_free)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3562 | struct slab *slabp; |
| 3563 | |
| 3564 | slabp = list_entry(p, struct slab, list); |
| 3565 | BUG_ON(slabp->inuse); |
| 3566 | |
| 3567 | i++; |
| 3568 | p = p->next; |
| 3569 | } |
| 3570 | STATS_SET_FREEABLE(cachep, i); |
| 3571 | } |
| 3572 | #endif |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3573 | spin_unlock(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3574 | ac->avail -= batchcount; |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3575 | memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3576 | } |
| 3577 | |
| 3578 | /* |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3579 | * Release an obj back to its cache. If the obj has a constructed state, it must |
| 3580 | * be in this state _before_ it is released. Called with disabled ints. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3581 | */ |
Ingo Molnar | 873623d | 2006-07-13 14:44:38 +0200 | [diff] [blame] | 3582 | static inline void __cache_free(struct kmem_cache *cachep, void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3583 | { |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 3584 | struct array_cache *ac = cpu_cache_get(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3585 | |
| 3586 | check_irq_off(); |
| 3587 | objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0)); |
| 3588 | |
Siddha, Suresh B | 1807a1a | 2007-08-22 14:01:49 -0700 | [diff] [blame] | 3589 | /* |
| 3590 | * Skip calling cache_free_alien() when the platform is not numa. |
| 3591 | * This will avoid cache misses that happen while accessing slabp (which |
| 3592 | * is per page memory reference) to get nodeid. Instead use a global |
| 3593 | * variable to skip the call, which is mostly likely to be present in |
| 3594 | * the cache. |
| 3595 | */ |
| 3596 | if (numa_platform && cache_free_alien(cachep, objp)) |
Pekka Enberg | 729bd0b | 2006-06-23 02:03:05 -0700 | [diff] [blame] | 3597 | return; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3599 | if (likely(ac->avail < ac->limit)) { |
| 3600 | STATS_INC_FREEHIT(cachep); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3601 | ac->entry[ac->avail++] = objp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3602 | return; |
| 3603 | } else { |
| 3604 | STATS_INC_FREEMISS(cachep); |
| 3605 | cache_flusharray(cachep, ac); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3606 | ac->entry[ac->avail++] = objp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3607 | } |
| 3608 | } |
| 3609 | |
| 3610 | /** |
| 3611 | * kmem_cache_alloc - Allocate an object |
| 3612 | * @cachep: The cache to allocate from. |
| 3613 | * @flags: See kmalloc(). |
| 3614 | * |
| 3615 | * Allocate an object from this cache. The flags are only relevant |
| 3616 | * if the cache has no available objects. |
| 3617 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3618 | void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3619 | { |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 3620 | return __cache_alloc(cachep, flags, __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3621 | } |
| 3622 | EXPORT_SYMBOL(kmem_cache_alloc); |
| 3623 | |
| 3624 | /** |
| 3625 | * kmem_ptr_validate - check if an untrusted pointer might |
| 3626 | * be a slab entry. |
| 3627 | * @cachep: the cache we're checking against |
| 3628 | * @ptr: pointer to validate |
| 3629 | * |
| 3630 | * This verifies that the untrusted pointer looks sane: |
| 3631 | * it is _not_ a guarantee that the pointer is actually |
| 3632 | * part of the slab cache in question, but it at least |
| 3633 | * validates that the pointer can be dereferenced and |
| 3634 | * looks half-way sane. |
| 3635 | * |
| 3636 | * Currently only used for dentry validation. |
| 3637 | */ |
Christoph Lameter | b7f869a2 | 2006-12-22 01:06:44 -0800 | [diff] [blame] | 3638 | int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3639 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3640 | unsigned long addr = (unsigned long)ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3641 | unsigned long min_addr = PAGE_OFFSET; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3642 | unsigned long align_mask = BYTES_PER_WORD - 1; |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3643 | unsigned long size = cachep->buffer_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3644 | struct page *page; |
| 3645 | |
| 3646 | if (unlikely(addr < min_addr)) |
| 3647 | goto out; |
| 3648 | if (unlikely(addr > (unsigned long)high_memory - size)) |
| 3649 | goto out; |
| 3650 | if (unlikely(addr & align_mask)) |
| 3651 | goto out; |
| 3652 | if (unlikely(!kern_addr_valid(addr))) |
| 3653 | goto out; |
| 3654 | if (unlikely(!kern_addr_valid(addr + size - 1))) |
| 3655 | goto out; |
| 3656 | page = virt_to_page(ptr); |
| 3657 | if (unlikely(!PageSlab(page))) |
| 3658 | goto out; |
Pekka Enberg | 065d41c | 2005-11-13 16:06:46 -0800 | [diff] [blame] | 3659 | if (unlikely(page_get_cache(page) != cachep)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3660 | goto out; |
| 3661 | return 1; |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3662 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3663 | return 0; |
| 3664 | } |
| 3665 | |
| 3666 | #ifdef CONFIG_NUMA |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 3667 | void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
| 3668 | { |
| 3669 | return __cache_alloc_node(cachep, flags, nodeid, |
| 3670 | __builtin_return_address(0)); |
| 3671 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3672 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
| 3673 | |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 3674 | static __always_inline void * |
| 3675 | __do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller) |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 3676 | { |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3677 | struct kmem_cache *cachep; |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 3678 | |
| 3679 | cachep = kmem_find_general_cachep(size, flags); |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3680 | if (unlikely(ZERO_OR_NULL_PTR(cachep))) |
| 3681 | return cachep; |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 3682 | return kmem_cache_alloc_node(cachep, flags, node); |
| 3683 | } |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 3684 | |
| 3685 | #ifdef CONFIG_DEBUG_SLAB |
| 3686 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| 3687 | { |
| 3688 | return __do_kmalloc_node(size, flags, node, |
| 3689 | __builtin_return_address(0)); |
| 3690 | } |
Christoph Hellwig | dbe5e69 | 2006-09-25 23:31:36 -0700 | [diff] [blame] | 3691 | EXPORT_SYMBOL(__kmalloc_node); |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 3692 | |
| 3693 | void *__kmalloc_node_track_caller(size_t size, gfp_t flags, |
| 3694 | int node, void *caller) |
| 3695 | { |
| 3696 | return __do_kmalloc_node(size, flags, node, caller); |
| 3697 | } |
| 3698 | EXPORT_SYMBOL(__kmalloc_node_track_caller); |
| 3699 | #else |
| 3700 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| 3701 | { |
| 3702 | return __do_kmalloc_node(size, flags, node, NULL); |
| 3703 | } |
| 3704 | EXPORT_SYMBOL(__kmalloc_node); |
| 3705 | #endif /* CONFIG_DEBUG_SLAB */ |
| 3706 | #endif /* CONFIG_NUMA */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3707 | |
| 3708 | /** |
Paul Drynoff | 800590f | 2006-06-23 02:03:48 -0700 | [diff] [blame] | 3709 | * __do_kmalloc - allocate memory |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3710 | * @size: how many bytes of memory are required. |
Paul Drynoff | 800590f | 2006-06-23 02:03:48 -0700 | [diff] [blame] | 3711 | * @flags: the type of memory to allocate (see kmalloc). |
Randy Dunlap | 911851e | 2006-03-22 00:08:14 -0800 | [diff] [blame] | 3712 | * @caller: function caller for debug tracking of the caller |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3713 | */ |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 3714 | static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, |
| 3715 | void *caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3716 | { |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3717 | struct kmem_cache *cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3718 | |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 3719 | /* If you want to save a few bytes .text space: replace |
| 3720 | * __ with kmem_. |
| 3721 | * Then kmalloc uses the uninlined functions instead of the inline |
| 3722 | * functions. |
| 3723 | */ |
| 3724 | cachep = __find_general_cachep(size, flags); |
Linus Torvalds | a5c96d8 | 2007-07-19 13:17:15 -0700 | [diff] [blame] | 3725 | if (unlikely(ZERO_OR_NULL_PTR(cachep))) |
| 3726 | return cachep; |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 3727 | return __cache_alloc(cachep, flags, caller); |
| 3728 | } |
| 3729 | |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 3730 | |
Christoph Hellwig | 1d2c8ee | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 3731 | #ifdef CONFIG_DEBUG_SLAB |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 3732 | void *__kmalloc(size_t size, gfp_t flags) |
| 3733 | { |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 3734 | return __do_kmalloc(size, flags, __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3735 | } |
| 3736 | EXPORT_SYMBOL(__kmalloc); |
| 3737 | |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 3738 | void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller) |
| 3739 | { |
| 3740 | return __do_kmalloc(size, flags, caller); |
| 3741 | } |
| 3742 | EXPORT_SYMBOL(__kmalloc_track_caller); |
Christoph Hellwig | 1d2c8ee | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 3743 | |
| 3744 | #else |
| 3745 | void *__kmalloc(size_t size, gfp_t flags) |
| 3746 | { |
| 3747 | return __do_kmalloc(size, flags, NULL); |
| 3748 | } |
| 3749 | EXPORT_SYMBOL(__kmalloc); |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 3750 | #endif |
| 3751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3752 | /** |
| 3753 | * kmem_cache_free - Deallocate an object |
| 3754 | * @cachep: The cache the allocation was from. |
| 3755 | * @objp: The previously allocated object. |
| 3756 | * |
| 3757 | * Free an object which was previously allocated from this |
| 3758 | * cache. |
| 3759 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3760 | void kmem_cache_free(struct kmem_cache *cachep, void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3761 | { |
| 3762 | unsigned long flags; |
| 3763 | |
| 3764 | local_irq_save(flags); |
Ingo Molnar | 898552c | 2007-02-10 01:44:57 -0800 | [diff] [blame] | 3765 | debug_check_no_locks_freed(objp, obj_size(cachep)); |
Ingo Molnar | 873623d | 2006-07-13 14:44:38 +0200 | [diff] [blame] | 3766 | __cache_free(cachep, objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3767 | local_irq_restore(flags); |
| 3768 | } |
| 3769 | EXPORT_SYMBOL(kmem_cache_free); |
| 3770 | |
| 3771 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3772 | * kfree - free previously allocated memory |
| 3773 | * @objp: pointer returned by kmalloc. |
| 3774 | * |
Pekka Enberg | 80e93ef | 2005-09-09 13:10:16 -0700 | [diff] [blame] | 3775 | * If @objp is NULL, no operation is performed. |
| 3776 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3777 | * Don't free memory not originally allocated by kmalloc() |
| 3778 | * or you will run into trouble. |
| 3779 | */ |
| 3780 | void kfree(const void *objp) |
| 3781 | { |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3782 | struct kmem_cache *c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3783 | unsigned long flags; |
| 3784 | |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3785 | if (unlikely(ZERO_OR_NULL_PTR(objp))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3786 | return; |
| 3787 | local_irq_save(flags); |
| 3788 | kfree_debugcheck(objp); |
Pekka Enberg | 6ed5eb221 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 3789 | c = virt_to_cache(objp); |
Ingo Molnar | f9b8404 | 2006-06-27 02:54:49 -0700 | [diff] [blame] | 3790 | debug_check_no_locks_freed(objp, obj_size(c)); |
Ingo Molnar | 873623d | 2006-07-13 14:44:38 +0200 | [diff] [blame] | 3791 | __cache_free(c, (void *)objp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3792 | local_irq_restore(flags); |
| 3793 | } |
| 3794 | EXPORT_SYMBOL(kfree); |
| 3795 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3796 | unsigned int kmem_cache_size(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3797 | { |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3798 | return obj_size(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3799 | } |
| 3800 | EXPORT_SYMBOL(kmem_cache_size); |
| 3801 | |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3802 | const char *kmem_cache_name(struct kmem_cache *cachep) |
Arnaldo Carvalho de Melo | 1944972 | 2005-06-18 22:46:19 -0700 | [diff] [blame] | 3803 | { |
| 3804 | return cachep->name; |
| 3805 | } |
| 3806 | EXPORT_SYMBOL_GPL(kmem_cache_name); |
| 3807 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3808 | /* |
Simon Arlott | 183ff22 | 2007-10-20 01:27:18 +0200 | [diff] [blame] | 3809 | * This initializes kmem_list3 or resizes various caches for all nodes. |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3810 | */ |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3811 | static int alloc_kmemlist(struct kmem_cache *cachep) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3812 | { |
| 3813 | int node; |
| 3814 | struct kmem_list3 *l3; |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3815 | struct array_cache *new_shared; |
Paul Menage | 3395ee0 | 2006-12-06 20:32:16 -0800 | [diff] [blame] | 3816 | struct array_cache **new_alien = NULL; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3817 | |
Christoph Lameter | 04231b3 | 2007-10-16 01:25:32 -0700 | [diff] [blame] | 3818 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3819 | |
Paul Menage | 3395ee0 | 2006-12-06 20:32:16 -0800 | [diff] [blame] | 3820 | if (use_alien_caches) { |
| 3821 | new_alien = alloc_alien_cache(node, cachep->limit); |
| 3822 | if (!new_alien) |
| 3823 | goto fail; |
| 3824 | } |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3825 | |
Eric Dumazet | 6310984 | 2007-05-06 14:49:28 -0700 | [diff] [blame] | 3826 | new_shared = NULL; |
| 3827 | if (cachep->shared) { |
| 3828 | new_shared = alloc_arraycache(node, |
Christoph Lameter | 0718dc2 | 2006-03-25 03:06:47 -0800 | [diff] [blame] | 3829 | cachep->shared*cachep->batchcount, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3830 | 0xbaadf00d); |
Eric Dumazet | 6310984 | 2007-05-06 14:49:28 -0700 | [diff] [blame] | 3831 | if (!new_shared) { |
| 3832 | free_alien_cache(new_alien); |
| 3833 | goto fail; |
| 3834 | } |
Christoph Lameter | 0718dc2 | 2006-03-25 03:06:47 -0800 | [diff] [blame] | 3835 | } |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3836 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3837 | l3 = cachep->nodelists[node]; |
| 3838 | if (l3) { |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3839 | struct array_cache *shared = l3->shared; |
| 3840 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3841 | spin_lock_irq(&l3->list_lock); |
| 3842 | |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3843 | if (shared) |
Christoph Lameter | 0718dc2 | 2006-03-25 03:06:47 -0800 | [diff] [blame] | 3844 | free_block(cachep, shared->entry, |
| 3845 | shared->avail, node); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3846 | |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3847 | l3->shared = new_shared; |
| 3848 | if (!l3->alien) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3849 | l3->alien = new_alien; |
| 3850 | new_alien = NULL; |
| 3851 | } |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3852 | l3->free_limit = (1 + nr_cpus_node(node)) * |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3853 | cachep->batchcount + cachep->num; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3854 | spin_unlock_irq(&l3->list_lock); |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3855 | kfree(shared); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3856 | free_alien_cache(new_alien); |
| 3857 | continue; |
| 3858 | } |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3859 | l3 = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, node); |
Christoph Lameter | 0718dc2 | 2006-03-25 03:06:47 -0800 | [diff] [blame] | 3860 | if (!l3) { |
| 3861 | free_alien_cache(new_alien); |
| 3862 | kfree(new_shared); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3863 | goto fail; |
Christoph Lameter | 0718dc2 | 2006-03-25 03:06:47 -0800 | [diff] [blame] | 3864 | } |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3865 | |
| 3866 | kmem_list3_init(l3); |
| 3867 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3868 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3869 | l3->shared = new_shared; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3870 | l3->alien = new_alien; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3871 | l3->free_limit = (1 + nr_cpus_node(node)) * |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3872 | cachep->batchcount + cachep->num; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3873 | cachep->nodelists[node] = l3; |
| 3874 | } |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3875 | return 0; |
Christoph Lameter | 0718dc2 | 2006-03-25 03:06:47 -0800 | [diff] [blame] | 3876 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3877 | fail: |
Christoph Lameter | 0718dc2 | 2006-03-25 03:06:47 -0800 | [diff] [blame] | 3878 | if (!cachep->next.next) { |
| 3879 | /* Cache is not active yet. Roll back what we did */ |
| 3880 | node--; |
| 3881 | while (node >= 0) { |
| 3882 | if (cachep->nodelists[node]) { |
| 3883 | l3 = cachep->nodelists[node]; |
| 3884 | |
| 3885 | kfree(l3->shared); |
| 3886 | free_alien_cache(l3->alien); |
| 3887 | kfree(l3); |
| 3888 | cachep->nodelists[node] = NULL; |
| 3889 | } |
| 3890 | node--; |
| 3891 | } |
| 3892 | } |
Christoph Lameter | cafeb02 | 2006-03-25 03:06:46 -0800 | [diff] [blame] | 3893 | return -ENOMEM; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3894 | } |
| 3895 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3896 | struct ccupdate_struct { |
Pekka Enberg | 343e0d7 | 2006-02-01 03:05:50 -0800 | [diff] [blame] | 3897 | struct kmem_cache *cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3898 | struct array_cache *new[NR_CPUS]; |
| 3899 | }; |
| 3900 | |
| 3901 | static void do_ccupdate_local(void *info) |
| 3902 | { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3903 | struct ccupdate_struct *new = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3904 | struct array_cache *old; |
| 3905 | |
| 3906 | check_irq_off(); |
Pekka Enberg | 9a2dba4 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 3907 | old = cpu_cache_get(new->cachep); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3909 | new->cachep->array[smp_processor_id()] = new->new[smp_processor_id()]; |
| 3910 | new->new[smp_processor_id()] = old; |
| 3911 | } |
| 3912 | |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 3913 | /* Always called with the cache_chain_mutex held */ |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3914 | static int do_tune_cpucache(struct kmem_cache *cachep, int limit, |
| 3915 | int batchcount, int shared) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3916 | { |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3917 | struct ccupdate_struct *new; |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 3918 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3919 | |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3920 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
| 3921 | if (!new) |
| 3922 | return -ENOMEM; |
| 3923 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3924 | for_each_online_cpu(i) { |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3925 | new->new[i] = alloc_arraycache(cpu_to_node(i), limit, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3926 | batchcount); |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3927 | if (!new->new[i]) { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 3928 | for (i--; i >= 0; i--) |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3929 | kfree(new->new[i]); |
| 3930 | kfree(new); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3931 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3932 | } |
| 3933 | } |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3934 | new->cachep = cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3935 | |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3936 | on_each_cpu(do_ccupdate_local, (void *)new, 1, 1); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3938 | check_irq_on(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3939 | cachep->batchcount = batchcount; |
| 3940 | cachep->limit = limit; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3941 | cachep->shared = shared; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3942 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3943 | for_each_online_cpu(i) { |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3944 | struct array_cache *ccold = new->new[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3945 | if (!ccold) |
| 3946 | continue; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3947 | spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
Christoph Lameter | ff69416 | 2005-09-22 21:44:02 -0700 | [diff] [blame] | 3948 | free_block(cachep, ccold->entry, ccold->avail, cpu_to_node(i)); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 3949 | spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3950 | kfree(ccold); |
| 3951 | } |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 3952 | kfree(new); |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 3953 | return alloc_kmemlist(cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3954 | } |
| 3955 | |
Ravikiran G Thirumalai | b5d8ca7 | 2006-03-22 00:08:12 -0800 | [diff] [blame] | 3956 | /* Called with cache_chain_mutex held always */ |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 3957 | static int enable_cpucache(struct kmem_cache *cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3958 | { |
| 3959 | int err; |
| 3960 | int limit, shared; |
| 3961 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3962 | /* |
| 3963 | * The head array serves three purposes: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3964 | * - create a LIFO ordering, i.e. return objects that are cache-warm |
| 3965 | * - reduce the number of spinlock operations. |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3966 | * - reduce the number of linked list operations on the slab and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3967 | * bufctl chains: array operations are cheaper. |
| 3968 | * The numbers are guessed, we should auto-tune as described by |
| 3969 | * Bonwick. |
| 3970 | */ |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3971 | if (cachep->buffer_size > 131072) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3972 | limit = 1; |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3973 | else if (cachep->buffer_size > PAGE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3974 | limit = 8; |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3975 | else if (cachep->buffer_size > 1024) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3976 | limit = 24; |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 3977 | else if (cachep->buffer_size > 256) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3978 | limit = 54; |
| 3979 | else |
| 3980 | limit = 120; |
| 3981 | |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3982 | /* |
| 3983 | * CPU bound tasks (e.g. network routing) can exhibit cpu bound |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3984 | * allocation behaviour: Most allocs on one cpu, most free operations |
| 3985 | * on another cpu. For these cases, an efficient object passing between |
| 3986 | * cpus is necessary. This is provided by a shared array. The array |
| 3987 | * replaces Bonwick's magazine layer. |
| 3988 | * On uniprocessor, it's functionally equivalent (but less efficient) |
| 3989 | * to a larger limit. Thus disabled by default. |
| 3990 | */ |
| 3991 | shared = 0; |
Eric Dumazet | 364fbb2 | 2007-05-06 14:49:27 -0700 | [diff] [blame] | 3992 | if (cachep->buffer_size <= PAGE_SIZE && num_possible_cpus() > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3993 | shared = 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3994 | |
| 3995 | #if DEBUG |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 3996 | /* |
| 3997 | * With debugging enabled, large batchcount lead to excessively long |
| 3998 | * periods with disabled local interrupts. Limit the batchcount |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3999 | */ |
| 4000 | if (limit > 32) |
| 4001 | limit = 32; |
| 4002 | #endif |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4003 | err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4004 | if (err) |
| 4005 | printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4006 | cachep->name, -err); |
Christoph Lameter | 2ed3a4e | 2006-09-25 23:31:38 -0700 | [diff] [blame] | 4007 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4008 | } |
| 4009 | |
Christoph Lameter | 1b55253 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4010 | /* |
| 4011 | * Drain an array if it contains any elements taking the l3 lock only if |
Christoph Lameter | b18e7e6 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4012 | * necessary. Note that the l3 listlock also protects the array_cache |
| 4013 | * if drain_array() is used on the shared array. |
Christoph Lameter | 1b55253 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4014 | */ |
| 4015 | void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, |
| 4016 | struct array_cache *ac, int force, int node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4017 | { |
| 4018 | int tofree; |
| 4019 | |
Christoph Lameter | 1b55253 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4020 | if (!ac || !ac->avail) |
| 4021 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4022 | if (ac->touched && !force) { |
| 4023 | ac->touched = 0; |
Christoph Lameter | b18e7e6 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4024 | } else { |
Christoph Lameter | 1b55253 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4025 | spin_lock_irq(&l3->list_lock); |
Christoph Lameter | b18e7e6 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4026 | if (ac->avail) { |
| 4027 | tofree = force ? ac->avail : (ac->limit + 4) / 5; |
| 4028 | if (tofree > ac->avail) |
| 4029 | tofree = (ac->avail + 1) / 2; |
| 4030 | free_block(cachep, ac->entry, tofree, node); |
| 4031 | ac->avail -= tofree; |
| 4032 | memmove(ac->entry, &(ac->entry[tofree]), |
| 4033 | sizeof(void *) * ac->avail); |
| 4034 | } |
Christoph Lameter | 1b55253 | 2006-03-22 00:09:07 -0800 | [diff] [blame] | 4035 | spin_unlock_irq(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4036 | } |
| 4037 | } |
| 4038 | |
| 4039 | /** |
| 4040 | * cache_reap - Reclaim memory from caches. |
Randy Dunlap | 05fb6bf | 2007-02-28 20:12:13 -0800 | [diff] [blame] | 4041 | * @w: work descriptor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4042 | * |
| 4043 | * Called from workqueue/eventd every few seconds. |
| 4044 | * Purpose: |
| 4045 | * - clear the per-cpu caches for this CPU. |
| 4046 | * - return freeable pages to the main free memory pool. |
| 4047 | * |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 4048 | * If we cannot acquire the cache chain mutex then just give up - we'll try |
| 4049 | * again on the next iteration. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4050 | */ |
Christoph Lameter | 7c5cae3 | 2007-02-10 01:42:55 -0800 | [diff] [blame] | 4051 | static void cache_reap(struct work_struct *w) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4052 | { |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4053 | struct kmem_cache *searchp; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4054 | struct kmem_list3 *l3; |
Christoph Lameter | aab2207 | 2006-03-22 00:09:06 -0800 | [diff] [blame] | 4055 | int node = numa_node_id(); |
Christoph Lameter | 7c5cae3 | 2007-02-10 01:42:55 -0800 | [diff] [blame] | 4056 | struct delayed_work *work = |
| 4057 | container_of(w, struct delayed_work, work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4058 | |
Christoph Lameter | 7c5cae3 | 2007-02-10 01:42:55 -0800 | [diff] [blame] | 4059 | if (!mutex_trylock(&cache_chain_mutex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4060 | /* Give up. Setup the next iteration. */ |
Christoph Lameter | 7c5cae3 | 2007-02-10 01:42:55 -0800 | [diff] [blame] | 4061 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4062 | |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4063 | list_for_each_entry(searchp, &cache_chain, next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4064 | check_irq_on(); |
| 4065 | |
Christoph Lameter | 35386e3 | 2006-03-22 00:09:05 -0800 | [diff] [blame] | 4066 | /* |
| 4067 | * We only take the l3 lock if absolutely necessary and we |
| 4068 | * have established with reasonable certainty that |
| 4069 | * we can do some work if the lock was obtained. |
| 4070 | */ |
Christoph Lameter | aab2207 | 2006-03-22 00:09:06 -0800 | [diff] [blame] | 4071 | l3 = searchp->nodelists[node]; |
Christoph Lameter | 35386e3 | 2006-03-22 00:09:05 -0800 | [diff] [blame] | 4072 | |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 4073 | reap_alien(searchp, l3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4074 | |
Christoph Lameter | aab2207 | 2006-03-22 00:09:06 -0800 | [diff] [blame] | 4075 | drain_array(searchp, l3, cpu_cache_get(searchp), 0, node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4076 | |
Christoph Lameter | 35386e3 | 2006-03-22 00:09:05 -0800 | [diff] [blame] | 4077 | /* |
| 4078 | * These are racy checks but it does not matter |
| 4079 | * if we skip one check or scan twice. |
| 4080 | */ |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4081 | if (time_after(l3->next_reap, jiffies)) |
Christoph Lameter | 35386e3 | 2006-03-22 00:09:05 -0800 | [diff] [blame] | 4082 | goto next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4083 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4084 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4085 | |
Christoph Lameter | aab2207 | 2006-03-22 00:09:06 -0800 | [diff] [blame] | 4086 | drain_array(searchp, l3, l3->shared, 0, node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4087 | |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 4088 | if (l3->free_touched) |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4089 | l3->free_touched = 0; |
Christoph Lameter | ed11d9e | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 4090 | else { |
| 4091 | int freed; |
| 4092 | |
| 4093 | freed = drain_freelist(searchp, l3, (l3->free_limit + |
| 4094 | 5 * searchp->num - 1) / (5 * searchp->num)); |
| 4095 | STATS_ADD_REAPED(searchp, freed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4096 | } |
Christoph Lameter | 35386e3 | 2006-03-22 00:09:05 -0800 | [diff] [blame] | 4097 | next: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4098 | cond_resched(); |
| 4099 | } |
| 4100 | check_irq_on(); |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 4101 | mutex_unlock(&cache_chain_mutex); |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 4102 | next_reap_node(); |
Christoph Lameter | 7c5cae3 | 2007-02-10 01:42:55 -0800 | [diff] [blame] | 4103 | out: |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 4104 | /* Set up the next iteration */ |
Christoph Lameter | 7c5cae3 | 2007-02-10 01:42:55 -0800 | [diff] [blame] | 4105 | schedule_delayed_work(work, round_jiffies_relative(REAPTIMEOUT_CPUC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4106 | } |
| 4107 | |
| 4108 | #ifdef CONFIG_PROC_FS |
| 4109 | |
Pekka Enberg | 85289f9 | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 4110 | static void print_slabinfo_header(struct seq_file *m) |
| 4111 | { |
| 4112 | /* |
| 4113 | * Output format version, so at least we can change it |
| 4114 | * without _too_ many complaints. |
| 4115 | */ |
| 4116 | #if STATS |
| 4117 | seq_puts(m, "slabinfo - version: 2.1 (statistics)\n"); |
| 4118 | #else |
| 4119 | seq_puts(m, "slabinfo - version: 2.1\n"); |
| 4120 | #endif |
| 4121 | seq_puts(m, "# name <active_objs> <num_objs> <objsize> " |
| 4122 | "<objperslab> <pagesperslab>"); |
| 4123 | seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>"); |
| 4124 | seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); |
| 4125 | #if STATS |
| 4126 | seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> " |
Ravikiran G Thirumalai | fb7faf3 | 2006-04-10 22:52:54 -0700 | [diff] [blame] | 4127 | "<error> <maxfreeable> <nodeallocs> <remotefrees> <alienoverflow>"); |
Pekka Enberg | 85289f9 | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 4128 | seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>"); |
| 4129 | #endif |
| 4130 | seq_putc(m, '\n'); |
| 4131 | } |
| 4132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4133 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 4134 | { |
| 4135 | loff_t n = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4136 | |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 4137 | mutex_lock(&cache_chain_mutex); |
Pekka Enberg | 85289f9 | 2006-01-08 01:00:36 -0800 | [diff] [blame] | 4138 | if (!n) |
| 4139 | print_slabinfo_header(m); |
Pavel Emelianov | b92151b | 2007-07-15 23:38:04 -0700 | [diff] [blame] | 4140 | |
| 4141 | return seq_list_start(&cache_chain, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4142 | } |
| 4143 | |
| 4144 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) |
| 4145 | { |
Pavel Emelianov | b92151b | 2007-07-15 23:38:04 -0700 | [diff] [blame] | 4146 | return seq_list_next(p, &cache_chain, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4147 | } |
| 4148 | |
| 4149 | static void s_stop(struct seq_file *m, void *p) |
| 4150 | { |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 4151 | mutex_unlock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4152 | } |
| 4153 | |
| 4154 | static int s_show(struct seq_file *m, void *p) |
| 4155 | { |
Pavel Emelianov | b92151b | 2007-07-15 23:38:04 -0700 | [diff] [blame] | 4156 | struct kmem_cache *cachep = list_entry(p, struct kmem_cache, next); |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4157 | struct slab *slabp; |
| 4158 | unsigned long active_objs; |
| 4159 | unsigned long num_objs; |
| 4160 | unsigned long active_slabs = 0; |
| 4161 | unsigned long num_slabs, free_objects = 0, shared_avail = 0; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4162 | const char *name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4163 | char *error = NULL; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4164 | int node; |
| 4165 | struct kmem_list3 *l3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4167 | active_objs = 0; |
| 4168 | num_slabs = 0; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4169 | for_each_online_node(node) { |
| 4170 | l3 = cachep->nodelists[node]; |
| 4171 | if (!l3) |
| 4172 | continue; |
| 4173 | |
Ravikiran G Thirumalai | ca3b9b9 | 2006-02-04 23:27:58 -0800 | [diff] [blame] | 4174 | check_irq_on(); |
| 4175 | spin_lock_irq(&l3->list_lock); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4176 | |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4177 | list_for_each_entry(slabp, &l3->slabs_full, list) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4178 | if (slabp->inuse != cachep->num && !error) |
| 4179 | error = "slabs_full accounting error"; |
| 4180 | active_objs += cachep->num; |
| 4181 | active_slabs++; |
| 4182 | } |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4183 | list_for_each_entry(slabp, &l3->slabs_partial, list) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4184 | if (slabp->inuse == cachep->num && !error) |
| 4185 | error = "slabs_partial inuse accounting error"; |
| 4186 | if (!slabp->inuse && !error) |
| 4187 | error = "slabs_partial/inuse accounting error"; |
| 4188 | active_objs += slabp->inuse; |
| 4189 | active_slabs++; |
| 4190 | } |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4191 | list_for_each_entry(slabp, &l3->slabs_free, list) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4192 | if (slabp->inuse && !error) |
| 4193 | error = "slabs_free/inuse accounting error"; |
| 4194 | num_slabs++; |
| 4195 | } |
| 4196 | free_objects += l3->free_objects; |
Ravikiran G Thirumalai | 4484ebf | 2006-02-04 23:27:59 -0800 | [diff] [blame] | 4197 | if (l3->shared) |
| 4198 | shared_avail += l3->shared->avail; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4199 | |
Ravikiran G Thirumalai | ca3b9b9 | 2006-02-04 23:27:58 -0800 | [diff] [blame] | 4200 | spin_unlock_irq(&l3->list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4201 | } |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4202 | num_slabs += active_slabs; |
| 4203 | num_objs = num_slabs * cachep->num; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4204 | if (num_objs - active_objs != free_objects && !error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4205 | error = "free_objects accounting error"; |
| 4206 | |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4207 | name = cachep->name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4208 | if (error) |
| 4209 | printk(KERN_ERR "slab: cache %s error: %s\n", name, error); |
| 4210 | |
| 4211 | seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", |
Manfred Spraul | 3dafccf | 2006-02-01 03:05:42 -0800 | [diff] [blame] | 4212 | name, active_objs, num_objs, cachep->buffer_size, |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4213 | cachep->num, (1 << cachep->gfporder)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4214 | seq_printf(m, " : tunables %4u %4u %4u", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4215 | cachep->limit, cachep->batchcount, cachep->shared); |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4216 | seq_printf(m, " : slabdata %6lu %6lu %6lu", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4217 | active_slabs, num_slabs, shared_avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4218 | #if STATS |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4219 | { /* list3 stats */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4220 | unsigned long high = cachep->high_mark; |
| 4221 | unsigned long allocs = cachep->num_allocations; |
| 4222 | unsigned long grown = cachep->grown; |
| 4223 | unsigned long reaped = cachep->reaped; |
| 4224 | unsigned long errors = cachep->errors; |
| 4225 | unsigned long max_freeable = cachep->max_freeable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4226 | unsigned long node_allocs = cachep->node_allocs; |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4227 | unsigned long node_frees = cachep->node_frees; |
Ravikiran G Thirumalai | fb7faf3 | 2006-04-10 22:52:54 -0700 | [diff] [blame] | 4228 | unsigned long overflows = cachep->node_overflow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4229 | |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4230 | seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \ |
Ravikiran G Thirumalai | fb7faf3 | 2006-04-10 22:52:54 -0700 | [diff] [blame] | 4231 | %4lu %4lu %4lu %4lu %4lu", allocs, high, grown, |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 4232 | reaped, errors, max_freeable, node_allocs, |
Ravikiran G Thirumalai | fb7faf3 | 2006-04-10 22:52:54 -0700 | [diff] [blame] | 4233 | node_frees, overflows); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4234 | } |
| 4235 | /* cpu stats */ |
| 4236 | { |
| 4237 | unsigned long allochit = atomic_read(&cachep->allochit); |
| 4238 | unsigned long allocmiss = atomic_read(&cachep->allocmiss); |
| 4239 | unsigned long freehit = atomic_read(&cachep->freehit); |
| 4240 | unsigned long freemiss = atomic_read(&cachep->freemiss); |
| 4241 | |
| 4242 | seq_printf(m, " : cpustat %6lu %6lu %6lu %6lu", |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4243 | allochit, allocmiss, freehit, freemiss); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4244 | } |
| 4245 | #endif |
| 4246 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4247 | return 0; |
| 4248 | } |
| 4249 | |
| 4250 | /* |
| 4251 | * slabinfo_op - iterator that generates /proc/slabinfo |
| 4252 | * |
| 4253 | * Output layout: |
| 4254 | * cache-name |
| 4255 | * num-active-objs |
| 4256 | * total-objs |
| 4257 | * object size |
| 4258 | * num-active-slabs |
| 4259 | * total-slabs |
| 4260 | * num-pages-per-slab |
| 4261 | * + further values on SMP and with statistics enabled |
| 4262 | */ |
| 4263 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 4264 | const struct seq_operations slabinfo_op = { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4265 | .start = s_start, |
| 4266 | .next = s_next, |
| 4267 | .stop = s_stop, |
| 4268 | .show = s_show, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4269 | }; |
| 4270 | |
| 4271 | #define MAX_SLABINFO_WRITE 128 |
| 4272 | /** |
| 4273 | * slabinfo_write - Tuning for the slab allocator |
| 4274 | * @file: unused |
| 4275 | * @buffer: user buffer |
| 4276 | * @count: data length |
| 4277 | * @ppos: unused |
| 4278 | */ |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4279 | ssize_t slabinfo_write(struct file *file, const char __user * buffer, |
| 4280 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4281 | { |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4282 | char kbuf[MAX_SLABINFO_WRITE + 1], *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4283 | int limit, batchcount, shared, res; |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4284 | struct kmem_cache *cachep; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4286 | if (count > MAX_SLABINFO_WRITE) |
| 4287 | return -EINVAL; |
| 4288 | if (copy_from_user(&kbuf, buffer, count)) |
| 4289 | return -EFAULT; |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4290 | kbuf[MAX_SLABINFO_WRITE] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4291 | |
| 4292 | tmp = strchr(kbuf, ' '); |
| 4293 | if (!tmp) |
| 4294 | return -EINVAL; |
| 4295 | *tmp = '\0'; |
| 4296 | tmp++; |
| 4297 | if (sscanf(tmp, " %d %d %d", &limit, &batchcount, &shared) != 3) |
| 4298 | return -EINVAL; |
| 4299 | |
| 4300 | /* Find the cache in the chain of caches. */ |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 4301 | mutex_lock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4302 | res = -EINVAL; |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4303 | list_for_each_entry(cachep, &cache_chain, next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4304 | if (!strcmp(cachep->name, kbuf)) { |
Andrew Morton | a737b3e | 2006-03-22 00:08:11 -0800 | [diff] [blame] | 4305 | if (limit < 1 || batchcount < 1 || |
| 4306 | batchcount > limit || shared < 0) { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4307 | res = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4308 | } else { |
Christoph Lameter | e498be7 | 2005-09-09 13:03:32 -0700 | [diff] [blame] | 4309 | res = do_tune_cpucache(cachep, limit, |
Pekka Enberg | b28a02d | 2006-01-08 01:00:37 -0800 | [diff] [blame] | 4310 | batchcount, shared); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4311 | } |
| 4312 | break; |
| 4313 | } |
| 4314 | } |
Ingo Molnar | fc0abb1 | 2006-01-18 17:42:33 -0800 | [diff] [blame] | 4315 | mutex_unlock(&cache_chain_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4316 | if (res >= 0) |
| 4317 | res = count; |
| 4318 | return res; |
| 4319 | } |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4320 | |
| 4321 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
| 4322 | |
| 4323 | static void *leaks_start(struct seq_file *m, loff_t *pos) |
| 4324 | { |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4325 | mutex_lock(&cache_chain_mutex); |
Pavel Emelianov | b92151b | 2007-07-15 23:38:04 -0700 | [diff] [blame] | 4326 | return seq_list_start(&cache_chain, *pos); |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4327 | } |
| 4328 | |
| 4329 | static inline int add_caller(unsigned long *n, unsigned long v) |
| 4330 | { |
| 4331 | unsigned long *p; |
| 4332 | int l; |
| 4333 | if (!v) |
| 4334 | return 1; |
| 4335 | l = n[1]; |
| 4336 | p = n + 2; |
| 4337 | while (l) { |
| 4338 | int i = l/2; |
| 4339 | unsigned long *q = p + 2 * i; |
| 4340 | if (*q == v) { |
| 4341 | q[1]++; |
| 4342 | return 1; |
| 4343 | } |
| 4344 | if (*q > v) { |
| 4345 | l = i; |
| 4346 | } else { |
| 4347 | p = q + 2; |
| 4348 | l -= i + 1; |
| 4349 | } |
| 4350 | } |
| 4351 | if (++n[1] == n[0]) |
| 4352 | return 0; |
| 4353 | memmove(p + 2, p, n[1] * 2 * sizeof(unsigned long) - ((void *)p - (void *)n)); |
| 4354 | p[0] = v; |
| 4355 | p[1] = 1; |
| 4356 | return 1; |
| 4357 | } |
| 4358 | |
| 4359 | static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s) |
| 4360 | { |
| 4361 | void *p; |
| 4362 | int i; |
| 4363 | if (n[0] == n[1]) |
| 4364 | return; |
| 4365 | for (i = 0, p = s->s_mem; i < c->num; i++, p += c->buffer_size) { |
| 4366 | if (slab_bufctl(s)[i] != BUFCTL_ACTIVE) |
| 4367 | continue; |
| 4368 | if (!add_caller(n, (unsigned long)*dbg_userword(c, p))) |
| 4369 | return; |
| 4370 | } |
| 4371 | } |
| 4372 | |
| 4373 | static void show_symbol(struct seq_file *m, unsigned long address) |
| 4374 | { |
| 4375 | #ifdef CONFIG_KALLSYMS |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4376 | unsigned long offset, size; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 4377 | char modname[MODULE_NAME_LEN], name[KSYM_NAME_LEN]; |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4378 | |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 4379 | if (lookup_symbol_attrs(address, &size, &offset, modname, name) == 0) { |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4380 | seq_printf(m, "%s+%#lx/%#lx", name, offset, size); |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 4381 | if (modname[0]) |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4382 | seq_printf(m, " [%s]", modname); |
| 4383 | return; |
| 4384 | } |
| 4385 | #endif |
| 4386 | seq_printf(m, "%p", (void *)address); |
| 4387 | } |
| 4388 | |
| 4389 | static int leaks_show(struct seq_file *m, void *p) |
| 4390 | { |
Pavel Emelianov | b92151b | 2007-07-15 23:38:04 -0700 | [diff] [blame] | 4391 | struct kmem_cache *cachep = list_entry(p, struct kmem_cache, next); |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4392 | struct slab *slabp; |
| 4393 | struct kmem_list3 *l3; |
| 4394 | const char *name; |
| 4395 | unsigned long *n = m->private; |
| 4396 | int node; |
| 4397 | int i; |
| 4398 | |
| 4399 | if (!(cachep->flags & SLAB_STORE_USER)) |
| 4400 | return 0; |
| 4401 | if (!(cachep->flags & SLAB_RED_ZONE)) |
| 4402 | return 0; |
| 4403 | |
| 4404 | /* OK, we can do it */ |
| 4405 | |
| 4406 | n[1] = 0; |
| 4407 | |
| 4408 | for_each_online_node(node) { |
| 4409 | l3 = cachep->nodelists[node]; |
| 4410 | if (!l3) |
| 4411 | continue; |
| 4412 | |
| 4413 | check_irq_on(); |
| 4414 | spin_lock_irq(&l3->list_lock); |
| 4415 | |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4416 | list_for_each_entry(slabp, &l3->slabs_full, list) |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4417 | handle_slab(n, cachep, slabp); |
Christoph Hellwig | 7a7c381 | 2006-06-23 02:03:17 -0700 | [diff] [blame] | 4418 | list_for_each_entry(slabp, &l3->slabs_partial, list) |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4419 | handle_slab(n, cachep, slabp); |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4420 | spin_unlock_irq(&l3->list_lock); |
| 4421 | } |
| 4422 | name = cachep->name; |
| 4423 | if (n[0] == n[1]) { |
| 4424 | /* Increase the buffer size */ |
| 4425 | mutex_unlock(&cache_chain_mutex); |
| 4426 | m->private = kzalloc(n[0] * 4 * sizeof(unsigned long), GFP_KERNEL); |
| 4427 | if (!m->private) { |
| 4428 | /* Too bad, we are really out */ |
| 4429 | m->private = n; |
| 4430 | mutex_lock(&cache_chain_mutex); |
| 4431 | return -ENOMEM; |
| 4432 | } |
| 4433 | *(unsigned long *)m->private = n[0] * 2; |
| 4434 | kfree(n); |
| 4435 | mutex_lock(&cache_chain_mutex); |
| 4436 | /* Now make sure this entry will be retried */ |
| 4437 | m->count = m->size; |
| 4438 | return 0; |
| 4439 | } |
| 4440 | for (i = 0; i < n[1]; i++) { |
| 4441 | seq_printf(m, "%s: %lu ", name, n[2*i+3]); |
| 4442 | show_symbol(m, n[2*i+2]); |
| 4443 | seq_putc(m, '\n'); |
| 4444 | } |
Siddha, Suresh B | d2e7b7d | 2006-09-25 23:31:47 -0700 | [diff] [blame] | 4445 | |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4446 | return 0; |
| 4447 | } |
| 4448 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 4449 | const struct seq_operations slabstats_op = { |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 4450 | .start = leaks_start, |
| 4451 | .next = s_next, |
| 4452 | .stop = s_stop, |
| 4453 | .show = leaks_show, |
| 4454 | }; |
| 4455 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4456 | #endif |
| 4457 | |
Manfred Spraul | 00e145b | 2005-09-03 15:55:07 -0700 | [diff] [blame] | 4458 | /** |
| 4459 | * ksize - get the actual amount of memory allocated for a given object |
| 4460 | * @objp: Pointer to the object |
| 4461 | * |
| 4462 | * kmalloc may internally round up allocations and return more memory |
| 4463 | * than requested. ksize() can be used to determine the actual amount of |
| 4464 | * memory allocated. The caller may use this additional memory, even though |
| 4465 | * a smaller amount of memory was initially specified with the kmalloc call. |
| 4466 | * The caller must guarantee that objp points to a valid object previously |
| 4467 | * allocated with either kmalloc() or kmem_cache_alloc(). The object |
| 4468 | * must not be freed during the duration of the call. |
| 4469 | */ |
Pekka Enberg | fd76bab | 2007-05-06 14:48:40 -0700 | [diff] [blame] | 4470 | size_t ksize(const void *objp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4471 | { |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 4472 | BUG_ON(!objp); |
| 4473 | if (unlikely(objp == ZERO_SIZE_PTR)) |
Manfred Spraul | 00e145b | 2005-09-03 15:55:07 -0700 | [diff] [blame] | 4474 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4475 | |
Pekka Enberg | 6ed5eb221 | 2006-02-01 03:05:49 -0800 | [diff] [blame] | 4476 | return obj_size(virt_to_cache(objp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4477 | } |
Tetsuo Handa | f8fcc93 | 2007-12-04 23:45:08 -0800 | [diff] [blame] | 4478 | EXPORT_SYMBOL(ksize); |