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1da177e4 LT |
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 | |
29 | * slabs and you must pass objects with the same intializations to | |
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 | * | |
a737b3e2 | 53 | * The c_cpuarray may not be read with enabled local interrupts - |
1da177e4 LT |
54 | * it's changed with a smp_call_function(). |
55 | * | |
56 | * SMP synchronization: | |
57 | * constructors and destructors are called without any locking. | |
343e0d7a | 58 | * Several members in struct kmem_cache and struct slab never change, they |
1da177e4 LT |
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 | |
fc0abb14 | 71 | * The global cache-chain is protected by the mutex 'cache_chain_mutex'. |
1da177e4 LT |
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 | * | |
e498be7d CL |
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. | |
1da177e4 LT |
87 | */ |
88 | ||
89 | #include <linux/config.h> | |
90 | #include <linux/slab.h> | |
91 | #include <linux/mm.h> | |
c9cf5528 | 92 | #include <linux/poison.h> |
1da177e4 LT |
93 | #include <linux/swap.h> |
94 | #include <linux/cache.h> | |
95 | #include <linux/interrupt.h> | |
96 | #include <linux/init.h> | |
97 | #include <linux/compiler.h> | |
101a5001 | 98 | #include <linux/cpuset.h> |
1da177e4 LT |
99 | #include <linux/seq_file.h> |
100 | #include <linux/notifier.h> | |
101 | #include <linux/kallsyms.h> | |
102 | #include <linux/cpu.h> | |
103 | #include <linux/sysctl.h> | |
104 | #include <linux/module.h> | |
105 | #include <linux/rcupdate.h> | |
543537bd | 106 | #include <linux/string.h> |
e498be7d | 107 | #include <linux/nodemask.h> |
dc85da15 | 108 | #include <linux/mempolicy.h> |
fc0abb14 | 109 | #include <linux/mutex.h> |
e7eebaf6 | 110 | #include <linux/rtmutex.h> |
1da177e4 LT |
111 | |
112 | #include <asm/uaccess.h> | |
113 | #include <asm/cacheflush.h> | |
114 | #include <asm/tlbflush.h> | |
115 | #include <asm/page.h> | |
116 | ||
117 | /* | |
118 | * DEBUG - 1 for kmem_cache_create() to honour; SLAB_DEBUG_INITIAL, | |
119 | * SLAB_RED_ZONE & SLAB_POISON. | |
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 | ||
1da177e4 LT |
138 | /* Shouldn't this be in a header file somewhere? */ |
139 | #define BYTES_PER_WORD sizeof(void *) | |
140 | ||
141 | #ifndef cache_line_size | |
142 | #define cache_line_size() L1_CACHE_BYTES | |
143 | #endif | |
144 | ||
145 | #ifndef ARCH_KMALLOC_MINALIGN | |
146 | /* | |
147 | * Enforce a minimum alignment for the kmalloc caches. | |
148 | * Usually, the kmalloc caches are cache_line_size() aligned, except when | |
149 | * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned. | |
150 | * Some archs want to perform DMA into kmalloc caches and need a guaranteed | |
151 | * alignment larger than BYTES_PER_WORD. ARCH_KMALLOC_MINALIGN allows that. | |
152 | * Note that this flag disables some debug features. | |
153 | */ | |
154 | #define ARCH_KMALLOC_MINALIGN 0 | |
155 | #endif | |
156 | ||
157 | #ifndef ARCH_SLAB_MINALIGN | |
158 | /* | |
159 | * Enforce a minimum alignment for all caches. | |
160 | * Intended for archs that get misalignment faults even for BYTES_PER_WORD | |
161 | * aligned buffers. Includes ARCH_KMALLOC_MINALIGN. | |
162 | * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables | |
163 | * some debug features. | |
164 | */ | |
165 | #define ARCH_SLAB_MINALIGN 0 | |
166 | #endif | |
167 | ||
168 | #ifndef ARCH_KMALLOC_FLAGS | |
169 | #define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN | |
170 | #endif | |
171 | ||
172 | /* Legal flag mask for kmem_cache_create(). */ | |
173 | #if DEBUG | |
174 | # define CREATE_MASK (SLAB_DEBUG_INITIAL | SLAB_RED_ZONE | \ | |
175 | SLAB_POISON | SLAB_HWCACHE_ALIGN | \ | |
ac2b898c | 176 | SLAB_CACHE_DMA | \ |
1da177e4 LT |
177 | SLAB_MUST_HWCACHE_ALIGN | SLAB_STORE_USER | \ |
178 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ | |
101a5001 | 179 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) |
1da177e4 | 180 | #else |
ac2b898c | 181 | # define CREATE_MASK (SLAB_HWCACHE_ALIGN | \ |
1da177e4 LT |
182 | SLAB_CACHE_DMA | SLAB_MUST_HWCACHE_ALIGN | \ |
183 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ | |
101a5001 | 184 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) |
1da177e4 LT |
185 | #endif |
186 | ||
187 | /* | |
188 | * kmem_bufctl_t: | |
189 | * | |
190 | * Bufctl's are used for linking objs within a slab | |
191 | * linked offsets. | |
192 | * | |
193 | * This implementation relies on "struct page" for locating the cache & | |
194 | * slab an object belongs to. | |
195 | * This allows the bufctl structure to be small (one int), but limits | |
196 | * the number of objects a slab (not a cache) can contain when off-slab | |
197 | * bufctls are used. The limit is the size of the largest general cache | |
198 | * that does not use off-slab slabs. | |
199 | * For 32bit archs with 4 kB pages, is this 56. | |
200 | * This is not serious, as it is only for large objects, when it is unwise | |
201 | * to have too many per slab. | |
202 | * Note: This limit can be raised by introducing a general cache whose size | |
203 | * is less than 512 (PAGE_SIZE<<3), but greater than 256. | |
204 | */ | |
205 | ||
fa5b08d5 | 206 | typedef unsigned int kmem_bufctl_t; |
1da177e4 LT |
207 | #define BUFCTL_END (((kmem_bufctl_t)(~0U))-0) |
208 | #define BUFCTL_FREE (((kmem_bufctl_t)(~0U))-1) | |
871751e2 AV |
209 | #define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2) |
210 | #define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3) | |
1da177e4 | 211 | |
1da177e4 LT |
212 | /* |
213 | * struct slab | |
214 | * | |
215 | * Manages the objs in a slab. Placed either at the beginning of mem allocated | |
216 | * for a slab, or allocated from an general cache. | |
217 | * Slabs are chained into three list: fully used, partial, fully free slabs. | |
218 | */ | |
219 | struct slab { | |
b28a02de PE |
220 | struct list_head list; |
221 | unsigned long colouroff; | |
222 | void *s_mem; /* including colour offset */ | |
223 | unsigned int inuse; /* num of objs active in slab */ | |
224 | kmem_bufctl_t free; | |
225 | unsigned short nodeid; | |
1da177e4 LT |
226 | }; |
227 | ||
228 | /* | |
229 | * struct slab_rcu | |
230 | * | |
231 | * slab_destroy on a SLAB_DESTROY_BY_RCU cache uses this structure to | |
232 | * arrange for kmem_freepages to be called via RCU. This is useful if | |
233 | * we need to approach a kernel structure obliquely, from its address | |
234 | * obtained without the usual locking. We can lock the structure to | |
235 | * stabilize it and check it's still at the given address, only if we | |
236 | * can be sure that the memory has not been meanwhile reused for some | |
237 | * other kind of object (which our subsystem's lock might corrupt). | |
238 | * | |
239 | * rcu_read_lock before reading the address, then rcu_read_unlock after | |
240 | * taking the spinlock within the structure expected at that address. | |
241 | * | |
242 | * We assume struct slab_rcu can overlay struct slab when destroying. | |
243 | */ | |
244 | struct slab_rcu { | |
b28a02de | 245 | struct rcu_head head; |
343e0d7a | 246 | struct kmem_cache *cachep; |
b28a02de | 247 | void *addr; |
1da177e4 LT |
248 | }; |
249 | ||
250 | /* | |
251 | * struct array_cache | |
252 | * | |
1da177e4 LT |
253 | * Purpose: |
254 | * - LIFO ordering, to hand out cache-warm objects from _alloc | |
255 | * - reduce the number of linked list operations | |
256 | * - reduce spinlock operations | |
257 | * | |
258 | * The limit is stored in the per-cpu structure to reduce the data cache | |
259 | * footprint. | |
260 | * | |
261 | */ | |
262 | struct array_cache { | |
263 | unsigned int avail; | |
264 | unsigned int limit; | |
265 | unsigned int batchcount; | |
266 | unsigned int touched; | |
e498be7d | 267 | spinlock_t lock; |
a737b3e2 AM |
268 | void *entry[0]; /* |
269 | * Must have this definition in here for the proper | |
270 | * alignment of array_cache. Also simplifies accessing | |
271 | * the entries. | |
272 | * [0] is for gcc 2.95. It should really be []. | |
273 | */ | |
1da177e4 LT |
274 | }; |
275 | ||
a737b3e2 AM |
276 | /* |
277 | * bootstrap: The caches do not work without cpuarrays anymore, but the | |
278 | * cpuarrays are allocated from the generic caches... | |
1da177e4 LT |
279 | */ |
280 | #define BOOT_CPUCACHE_ENTRIES 1 | |
281 | struct arraycache_init { | |
282 | struct array_cache cache; | |
b28a02de | 283 | void *entries[BOOT_CPUCACHE_ENTRIES]; |
1da177e4 LT |
284 | }; |
285 | ||
286 | /* | |
e498be7d | 287 | * The slab lists for all objects. |
1da177e4 LT |
288 | */ |
289 | struct kmem_list3 { | |
b28a02de PE |
290 | struct list_head slabs_partial; /* partial list first, better asm code */ |
291 | struct list_head slabs_full; | |
292 | struct list_head slabs_free; | |
293 | unsigned long free_objects; | |
b28a02de | 294 | unsigned int free_limit; |
2e1217cf | 295 | unsigned int colour_next; /* Per-node cache coloring */ |
b28a02de PE |
296 | spinlock_t list_lock; |
297 | struct array_cache *shared; /* shared per node */ | |
298 | struct array_cache **alien; /* on other nodes */ | |
35386e3b CL |
299 | unsigned long next_reap; /* updated without locking */ |
300 | int free_touched; /* updated without locking */ | |
1da177e4 LT |
301 | }; |
302 | ||
e498be7d CL |
303 | /* |
304 | * Need this for bootstrapping a per node allocator. | |
305 | */ | |
306 | #define NUM_INIT_LISTS (2 * MAX_NUMNODES + 1) | |
307 | struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS]; | |
308 | #define CACHE_CACHE 0 | |
309 | #define SIZE_AC 1 | |
310 | #define SIZE_L3 (1 + MAX_NUMNODES) | |
311 | ||
312 | /* | |
a737b3e2 AM |
313 | * This function must be completely optimized away if a constant is passed to |
314 | * it. Mostly the same as what is in linux/slab.h except it returns an index. | |
e498be7d | 315 | */ |
7243cc05 | 316 | static __always_inline int index_of(const size_t size) |
e498be7d | 317 | { |
5ec8a847 SR |
318 | extern void __bad_size(void); |
319 | ||
e498be7d CL |
320 | if (__builtin_constant_p(size)) { |
321 | int i = 0; | |
322 | ||
323 | #define CACHE(x) \ | |
324 | if (size <=x) \ | |
325 | return i; \ | |
326 | else \ | |
327 | i++; | |
328 | #include "linux/kmalloc_sizes.h" | |
329 | #undef CACHE | |
5ec8a847 | 330 | __bad_size(); |
7243cc05 | 331 | } else |
5ec8a847 | 332 | __bad_size(); |
e498be7d CL |
333 | return 0; |
334 | } | |
335 | ||
e0a42726 IM |
336 | static int slab_early_init = 1; |
337 | ||
e498be7d CL |
338 | #define INDEX_AC index_of(sizeof(struct arraycache_init)) |
339 | #define INDEX_L3 index_of(sizeof(struct kmem_list3)) | |
1da177e4 | 340 | |
5295a74c | 341 | static void kmem_list3_init(struct kmem_list3 *parent) |
e498be7d CL |
342 | { |
343 | INIT_LIST_HEAD(&parent->slabs_full); | |
344 | INIT_LIST_HEAD(&parent->slabs_partial); | |
345 | INIT_LIST_HEAD(&parent->slabs_free); | |
346 | parent->shared = NULL; | |
347 | parent->alien = NULL; | |
2e1217cf | 348 | parent->colour_next = 0; |
e498be7d CL |
349 | spin_lock_init(&parent->list_lock); |
350 | parent->free_objects = 0; | |
351 | parent->free_touched = 0; | |
352 | } | |
353 | ||
a737b3e2 AM |
354 | #define MAKE_LIST(cachep, listp, slab, nodeid) \ |
355 | do { \ | |
356 | INIT_LIST_HEAD(listp); \ | |
357 | list_splice(&(cachep->nodelists[nodeid]->slab), listp); \ | |
e498be7d CL |
358 | } while (0) |
359 | ||
a737b3e2 AM |
360 | #define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ |
361 | do { \ | |
e498be7d CL |
362 | MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid); \ |
363 | MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \ | |
364 | MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \ | |
365 | } while (0) | |
1da177e4 LT |
366 | |
367 | /* | |
343e0d7a | 368 | * struct kmem_cache |
1da177e4 LT |
369 | * |
370 | * manages a cache. | |
371 | */ | |
b28a02de | 372 | |
2109a2d1 | 373 | struct kmem_cache { |
1da177e4 | 374 | /* 1) per-cpu data, touched during every alloc/free */ |
b28a02de | 375 | struct array_cache *array[NR_CPUS]; |
b5d8ca7c | 376 | /* 2) Cache tunables. Protected by cache_chain_mutex */ |
b28a02de PE |
377 | unsigned int batchcount; |
378 | unsigned int limit; | |
379 | unsigned int shared; | |
b5d8ca7c | 380 | |
3dafccf2 | 381 | unsigned int buffer_size; |
b5d8ca7c | 382 | /* 3) touched by every alloc & free from the backend */ |
b28a02de | 383 | struct kmem_list3 *nodelists[MAX_NUMNODES]; |
b5d8ca7c | 384 | |
a737b3e2 AM |
385 | unsigned int flags; /* constant flags */ |
386 | unsigned int num; /* # of objs per slab */ | |
1da177e4 | 387 | |
b5d8ca7c | 388 | /* 4) cache_grow/shrink */ |
1da177e4 | 389 | /* order of pgs per slab (2^n) */ |
b28a02de | 390 | unsigned int gfporder; |
1da177e4 LT |
391 | |
392 | /* force GFP flags, e.g. GFP_DMA */ | |
b28a02de | 393 | gfp_t gfpflags; |
1da177e4 | 394 | |
a737b3e2 | 395 | size_t colour; /* cache colouring range */ |
b28a02de | 396 | unsigned int colour_off; /* colour offset */ |
343e0d7a | 397 | struct kmem_cache *slabp_cache; |
b28a02de | 398 | unsigned int slab_size; |
a737b3e2 | 399 | unsigned int dflags; /* dynamic flags */ |
1da177e4 LT |
400 | |
401 | /* constructor func */ | |
343e0d7a | 402 | void (*ctor) (void *, struct kmem_cache *, unsigned long); |
1da177e4 LT |
403 | |
404 | /* de-constructor func */ | |
343e0d7a | 405 | void (*dtor) (void *, struct kmem_cache *, unsigned long); |
1da177e4 | 406 | |
b5d8ca7c | 407 | /* 5) cache creation/removal */ |
b28a02de PE |
408 | const char *name; |
409 | struct list_head next; | |
1da177e4 | 410 | |
b5d8ca7c | 411 | /* 6) statistics */ |
1da177e4 | 412 | #if STATS |
b28a02de PE |
413 | unsigned long num_active; |
414 | unsigned long num_allocations; | |
415 | unsigned long high_mark; | |
416 | unsigned long grown; | |
417 | unsigned long reaped; | |
418 | unsigned long errors; | |
419 | unsigned long max_freeable; | |
420 | unsigned long node_allocs; | |
421 | unsigned long node_frees; | |
fb7faf33 | 422 | unsigned long node_overflow; |
b28a02de PE |
423 | atomic_t allochit; |
424 | atomic_t allocmiss; | |
425 | atomic_t freehit; | |
426 | atomic_t freemiss; | |
1da177e4 LT |
427 | #endif |
428 | #if DEBUG | |
3dafccf2 MS |
429 | /* |
430 | * If debugging is enabled, then the allocator can add additional | |
431 | * fields and/or padding to every object. buffer_size contains the total | |
432 | * object size including these internal fields, the following two | |
433 | * variables contain the offset to the user object and its size. | |
434 | */ | |
435 | int obj_offset; | |
436 | int obj_size; | |
1da177e4 LT |
437 | #endif |
438 | }; | |
439 | ||
440 | #define CFLGS_OFF_SLAB (0x80000000UL) | |
441 | #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) | |
442 | ||
443 | #define BATCHREFILL_LIMIT 16 | |
a737b3e2 AM |
444 | /* |
445 | * Optimization question: fewer reaps means less probability for unnessary | |
446 | * cpucache drain/refill cycles. | |
1da177e4 | 447 | * |
dc6f3f27 | 448 | * OTOH the cpuarrays can contain lots of objects, |
1da177e4 LT |
449 | * which could lock up otherwise freeable slabs. |
450 | */ | |
451 | #define REAPTIMEOUT_CPUC (2*HZ) | |
452 | #define REAPTIMEOUT_LIST3 (4*HZ) | |
453 | ||
454 | #if STATS | |
455 | #define STATS_INC_ACTIVE(x) ((x)->num_active++) | |
456 | #define STATS_DEC_ACTIVE(x) ((x)->num_active--) | |
457 | #define STATS_INC_ALLOCED(x) ((x)->num_allocations++) | |
458 | #define STATS_INC_GROWN(x) ((x)->grown++) | |
459 | #define STATS_INC_REAPED(x) ((x)->reaped++) | |
a737b3e2 AM |
460 | #define STATS_SET_HIGH(x) \ |
461 | do { \ | |
462 | if ((x)->num_active > (x)->high_mark) \ | |
463 | (x)->high_mark = (x)->num_active; \ | |
464 | } while (0) | |
1da177e4 LT |
465 | #define STATS_INC_ERR(x) ((x)->errors++) |
466 | #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++) | |
e498be7d | 467 | #define STATS_INC_NODEFREES(x) ((x)->node_frees++) |
fb7faf33 | 468 | #define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++) |
a737b3e2 AM |
469 | #define STATS_SET_FREEABLE(x, i) \ |
470 | do { \ | |
471 | if ((x)->max_freeable < i) \ | |
472 | (x)->max_freeable = i; \ | |
473 | } while (0) | |
1da177e4 LT |
474 | #define STATS_INC_ALLOCHIT(x) atomic_inc(&(x)->allochit) |
475 | #define STATS_INC_ALLOCMISS(x) atomic_inc(&(x)->allocmiss) | |
476 | #define STATS_INC_FREEHIT(x) atomic_inc(&(x)->freehit) | |
477 | #define STATS_INC_FREEMISS(x) atomic_inc(&(x)->freemiss) | |
478 | #else | |
479 | #define STATS_INC_ACTIVE(x) do { } while (0) | |
480 | #define STATS_DEC_ACTIVE(x) do { } while (0) | |
481 | #define STATS_INC_ALLOCED(x) do { } while (0) | |
482 | #define STATS_INC_GROWN(x) do { } while (0) | |
483 | #define STATS_INC_REAPED(x) do { } while (0) | |
484 | #define STATS_SET_HIGH(x) do { } while (0) | |
485 | #define STATS_INC_ERR(x) do { } while (0) | |
486 | #define STATS_INC_NODEALLOCS(x) do { } while (0) | |
e498be7d | 487 | #define STATS_INC_NODEFREES(x) do { } while (0) |
fb7faf33 | 488 | #define STATS_INC_ACOVERFLOW(x) do { } while (0) |
a737b3e2 | 489 | #define STATS_SET_FREEABLE(x, i) do { } while (0) |
1da177e4 LT |
490 | #define STATS_INC_ALLOCHIT(x) do { } while (0) |
491 | #define STATS_INC_ALLOCMISS(x) do { } while (0) | |
492 | #define STATS_INC_FREEHIT(x) do { } while (0) | |
493 | #define STATS_INC_FREEMISS(x) do { } while (0) | |
494 | #endif | |
495 | ||
496 | #if DEBUG | |
1da177e4 | 497 | |
a737b3e2 AM |
498 | /* |
499 | * memory layout of objects: | |
1da177e4 | 500 | * 0 : objp |
3dafccf2 | 501 | * 0 .. cachep->obj_offset - BYTES_PER_WORD - 1: padding. This ensures that |
1da177e4 LT |
502 | * the end of an object is aligned with the end of the real |
503 | * allocation. Catches writes behind the end of the allocation. | |
3dafccf2 | 504 | * cachep->obj_offset - BYTES_PER_WORD .. cachep->obj_offset - 1: |
1da177e4 | 505 | * redzone word. |
3dafccf2 MS |
506 | * cachep->obj_offset: The real object. |
507 | * cachep->buffer_size - 2* BYTES_PER_WORD: redzone word [BYTES_PER_WORD long] | |
a737b3e2 AM |
508 | * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address |
509 | * [BYTES_PER_WORD long] | |
1da177e4 | 510 | */ |
343e0d7a | 511 | static int obj_offset(struct kmem_cache *cachep) |
1da177e4 | 512 | { |
3dafccf2 | 513 | return cachep->obj_offset; |
1da177e4 LT |
514 | } |
515 | ||
343e0d7a | 516 | static int obj_size(struct kmem_cache *cachep) |
1da177e4 | 517 | { |
3dafccf2 | 518 | return cachep->obj_size; |
1da177e4 LT |
519 | } |
520 | ||
343e0d7a | 521 | static unsigned long *dbg_redzone1(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
522 | { |
523 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
3dafccf2 | 524 | return (unsigned long*) (objp+obj_offset(cachep)-BYTES_PER_WORD); |
1da177e4 LT |
525 | } |
526 | ||
343e0d7a | 527 | static unsigned long *dbg_redzone2(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
528 | { |
529 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
530 | if (cachep->flags & SLAB_STORE_USER) | |
3dafccf2 | 531 | return (unsigned long *)(objp + cachep->buffer_size - |
b28a02de | 532 | 2 * BYTES_PER_WORD); |
3dafccf2 | 533 | return (unsigned long *)(objp + cachep->buffer_size - BYTES_PER_WORD); |
1da177e4 LT |
534 | } |
535 | ||
343e0d7a | 536 | static void **dbg_userword(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
537 | { |
538 | BUG_ON(!(cachep->flags & SLAB_STORE_USER)); | |
3dafccf2 | 539 | return (void **)(objp + cachep->buffer_size - BYTES_PER_WORD); |
1da177e4 LT |
540 | } |
541 | ||
542 | #else | |
543 | ||
3dafccf2 MS |
544 | #define obj_offset(x) 0 |
545 | #define obj_size(cachep) (cachep->buffer_size) | |
1da177e4 LT |
546 | #define dbg_redzone1(cachep, objp) ({BUG(); (unsigned long *)NULL;}) |
547 | #define dbg_redzone2(cachep, objp) ({BUG(); (unsigned long *)NULL;}) | |
548 | #define dbg_userword(cachep, objp) ({BUG(); (void **)NULL;}) | |
549 | ||
550 | #endif | |
551 | ||
552 | /* | |
a737b3e2 AM |
553 | * Maximum size of an obj (in 2^order pages) and absolute limit for the gfp |
554 | * order. | |
1da177e4 LT |
555 | */ |
556 | #if defined(CONFIG_LARGE_ALLOCS) | |
557 | #define MAX_OBJ_ORDER 13 /* up to 32Mb */ | |
558 | #define MAX_GFP_ORDER 13 /* up to 32Mb */ | |
559 | #elif defined(CONFIG_MMU) | |
560 | #define MAX_OBJ_ORDER 5 /* 32 pages */ | |
561 | #define MAX_GFP_ORDER 5 /* 32 pages */ | |
562 | #else | |
563 | #define MAX_OBJ_ORDER 8 /* up to 1Mb */ | |
564 | #define MAX_GFP_ORDER 8 /* up to 1Mb */ | |
565 | #endif | |
566 | ||
567 | /* | |
568 | * Do not go above this order unless 0 objects fit into the slab. | |
569 | */ | |
570 | #define BREAK_GFP_ORDER_HI 1 | |
571 | #define BREAK_GFP_ORDER_LO 0 | |
572 | static int slab_break_gfp_order = BREAK_GFP_ORDER_LO; | |
573 | ||
a737b3e2 AM |
574 | /* |
575 | * Functions for storing/retrieving the cachep and or slab from the page | |
576 | * allocator. These are used to find the slab an obj belongs to. With kfree(), | |
577 | * these are used to find the cache which an obj belongs to. | |
1da177e4 | 578 | */ |
065d41cb PE |
579 | static inline void page_set_cache(struct page *page, struct kmem_cache *cache) |
580 | { | |
581 | page->lru.next = (struct list_head *)cache; | |
582 | } | |
583 | ||
584 | static inline struct kmem_cache *page_get_cache(struct page *page) | |
585 | { | |
84097518 NP |
586 | if (unlikely(PageCompound(page))) |
587 | page = (struct page *)page_private(page); | |
ddc2e812 | 588 | BUG_ON(!PageSlab(page)); |
065d41cb PE |
589 | return (struct kmem_cache *)page->lru.next; |
590 | } | |
591 | ||
592 | static inline void page_set_slab(struct page *page, struct slab *slab) | |
593 | { | |
594 | page->lru.prev = (struct list_head *)slab; | |
595 | } | |
596 | ||
597 | static inline struct slab *page_get_slab(struct page *page) | |
598 | { | |
84097518 NP |
599 | if (unlikely(PageCompound(page))) |
600 | page = (struct page *)page_private(page); | |
ddc2e812 | 601 | BUG_ON(!PageSlab(page)); |
065d41cb PE |
602 | return (struct slab *)page->lru.prev; |
603 | } | |
1da177e4 | 604 | |
6ed5eb22 PE |
605 | static inline struct kmem_cache *virt_to_cache(const void *obj) |
606 | { | |
607 | struct page *page = virt_to_page(obj); | |
608 | return page_get_cache(page); | |
609 | } | |
610 | ||
611 | static inline struct slab *virt_to_slab(const void *obj) | |
612 | { | |
613 | struct page *page = virt_to_page(obj); | |
614 | return page_get_slab(page); | |
615 | } | |
616 | ||
8fea4e96 PE |
617 | static inline void *index_to_obj(struct kmem_cache *cache, struct slab *slab, |
618 | unsigned int idx) | |
619 | { | |
620 | return slab->s_mem + cache->buffer_size * idx; | |
621 | } | |
622 | ||
623 | static inline unsigned int obj_to_index(struct kmem_cache *cache, | |
624 | struct slab *slab, void *obj) | |
625 | { | |
626 | return (unsigned)(obj - slab->s_mem) / cache->buffer_size; | |
627 | } | |
628 | ||
a737b3e2 AM |
629 | /* |
630 | * These are the default caches for kmalloc. Custom caches can have other sizes. | |
631 | */ | |
1da177e4 LT |
632 | struct cache_sizes malloc_sizes[] = { |
633 | #define CACHE(x) { .cs_size = (x) }, | |
634 | #include <linux/kmalloc_sizes.h> | |
635 | CACHE(ULONG_MAX) | |
636 | #undef CACHE | |
637 | }; | |
638 | EXPORT_SYMBOL(malloc_sizes); | |
639 | ||
640 | /* Must match cache_sizes above. Out of line to keep cache footprint low. */ | |
641 | struct cache_names { | |
642 | char *name; | |
643 | char *name_dma; | |
644 | }; | |
645 | ||
646 | static struct cache_names __initdata cache_names[] = { | |
647 | #define CACHE(x) { .name = "size-" #x, .name_dma = "size-" #x "(DMA)" }, | |
648 | #include <linux/kmalloc_sizes.h> | |
b28a02de | 649 | {NULL,} |
1da177e4 LT |
650 | #undef CACHE |
651 | }; | |
652 | ||
653 | static struct arraycache_init initarray_cache __initdata = | |
b28a02de | 654 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 | 655 | static struct arraycache_init initarray_generic = |
b28a02de | 656 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 LT |
657 | |
658 | /* internal cache of cache description objs */ | |
343e0d7a | 659 | static struct kmem_cache cache_cache = { |
b28a02de PE |
660 | .batchcount = 1, |
661 | .limit = BOOT_CPUCACHE_ENTRIES, | |
662 | .shared = 1, | |
343e0d7a | 663 | .buffer_size = sizeof(struct kmem_cache), |
b28a02de | 664 | .name = "kmem_cache", |
1da177e4 | 665 | #if DEBUG |
343e0d7a | 666 | .obj_size = sizeof(struct kmem_cache), |
1da177e4 LT |
667 | #endif |
668 | }; | |
669 | ||
670 | /* Guard access to the cache-chain. */ | |
fc0abb14 | 671 | static DEFINE_MUTEX(cache_chain_mutex); |
1da177e4 LT |
672 | static struct list_head cache_chain; |
673 | ||
674 | /* | |
a737b3e2 AM |
675 | * vm_enough_memory() looks at this to determine how many slab-allocated pages |
676 | * are possibly freeable under pressure | |
1da177e4 LT |
677 | * |
678 | * SLAB_RECLAIM_ACCOUNT turns this on per-slab | |
679 | */ | |
680 | atomic_t slab_reclaim_pages; | |
1da177e4 LT |
681 | |
682 | /* | |
683 | * chicken and egg problem: delay the per-cpu array allocation | |
684 | * until the general caches are up. | |
685 | */ | |
686 | static enum { | |
687 | NONE, | |
e498be7d CL |
688 | PARTIAL_AC, |
689 | PARTIAL_L3, | |
1da177e4 LT |
690 | FULL |
691 | } g_cpucache_up; | |
692 | ||
39d24e64 MK |
693 | /* |
694 | * used by boot code to determine if it can use slab based allocator | |
695 | */ | |
696 | int slab_is_available(void) | |
697 | { | |
698 | return g_cpucache_up == FULL; | |
699 | } | |
700 | ||
1da177e4 LT |
701 | static DEFINE_PER_CPU(struct work_struct, reap_work); |
702 | ||
a737b3e2 AM |
703 | static void free_block(struct kmem_cache *cachep, void **objpp, int len, |
704 | int node); | |
343e0d7a | 705 | static void enable_cpucache(struct kmem_cache *cachep); |
b28a02de | 706 | static void cache_reap(void *unused); |
343e0d7a | 707 | static int __node_shrink(struct kmem_cache *cachep, int node); |
1da177e4 | 708 | |
343e0d7a | 709 | static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) |
1da177e4 LT |
710 | { |
711 | return cachep->array[smp_processor_id()]; | |
712 | } | |
713 | ||
a737b3e2 AM |
714 | static inline struct kmem_cache *__find_general_cachep(size_t size, |
715 | gfp_t gfpflags) | |
1da177e4 LT |
716 | { |
717 | struct cache_sizes *csizep = malloc_sizes; | |
718 | ||
719 | #if DEBUG | |
720 | /* This happens if someone tries to call | |
b28a02de PE |
721 | * kmem_cache_create(), or __kmalloc(), before |
722 | * the generic caches are initialized. | |
723 | */ | |
c7e43c78 | 724 | BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL); |
1da177e4 LT |
725 | #endif |
726 | while (size > csizep->cs_size) | |
727 | csizep++; | |
728 | ||
729 | /* | |
0abf40c1 | 730 | * Really subtle: The last entry with cs->cs_size==ULONG_MAX |
1da177e4 LT |
731 | * has cs_{dma,}cachep==NULL. Thus no special case |
732 | * for large kmalloc calls required. | |
733 | */ | |
734 | if (unlikely(gfpflags & GFP_DMA)) | |
735 | return csizep->cs_dmacachep; | |
736 | return csizep->cs_cachep; | |
737 | } | |
738 | ||
343e0d7a | 739 | struct kmem_cache *kmem_find_general_cachep(size_t size, gfp_t gfpflags) |
97e2bde4 MS |
740 | { |
741 | return __find_general_cachep(size, gfpflags); | |
742 | } | |
743 | EXPORT_SYMBOL(kmem_find_general_cachep); | |
744 | ||
fbaccacf | 745 | static size_t slab_mgmt_size(size_t nr_objs, size_t align) |
1da177e4 | 746 | { |
fbaccacf SR |
747 | return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align); |
748 | } | |
1da177e4 | 749 | |
a737b3e2 AM |
750 | /* |
751 | * Calculate the number of objects and left-over bytes for a given buffer size. | |
752 | */ | |
fbaccacf SR |
753 | static void cache_estimate(unsigned long gfporder, size_t buffer_size, |
754 | size_t align, int flags, size_t *left_over, | |
755 | unsigned int *num) | |
756 | { | |
757 | int nr_objs; | |
758 | size_t mgmt_size; | |
759 | size_t slab_size = PAGE_SIZE << gfporder; | |
1da177e4 | 760 | |
fbaccacf SR |
761 | /* |
762 | * The slab management structure can be either off the slab or | |
763 | * on it. For the latter case, the memory allocated for a | |
764 | * slab is used for: | |
765 | * | |
766 | * - The struct slab | |
767 | * - One kmem_bufctl_t for each object | |
768 | * - Padding to respect alignment of @align | |
769 | * - @buffer_size bytes for each object | |
770 | * | |
771 | * If the slab management structure is off the slab, then the | |
772 | * alignment will already be calculated into the size. Because | |
773 | * the slabs are all pages aligned, the objects will be at the | |
774 | * correct alignment when allocated. | |
775 | */ | |
776 | if (flags & CFLGS_OFF_SLAB) { | |
777 | mgmt_size = 0; | |
778 | nr_objs = slab_size / buffer_size; | |
779 | ||
780 | if (nr_objs > SLAB_LIMIT) | |
781 | nr_objs = SLAB_LIMIT; | |
782 | } else { | |
783 | /* | |
784 | * Ignore padding for the initial guess. The padding | |
785 | * is at most @align-1 bytes, and @buffer_size is at | |
786 | * least @align. In the worst case, this result will | |
787 | * be one greater than the number of objects that fit | |
788 | * into the memory allocation when taking the padding | |
789 | * into account. | |
790 | */ | |
791 | nr_objs = (slab_size - sizeof(struct slab)) / | |
792 | (buffer_size + sizeof(kmem_bufctl_t)); | |
793 | ||
794 | /* | |
795 | * This calculated number will be either the right | |
796 | * amount, or one greater than what we want. | |
797 | */ | |
798 | if (slab_mgmt_size(nr_objs, align) + nr_objs*buffer_size | |
799 | > slab_size) | |
800 | nr_objs--; | |
801 | ||
802 | if (nr_objs > SLAB_LIMIT) | |
803 | nr_objs = SLAB_LIMIT; | |
804 | ||
805 | mgmt_size = slab_mgmt_size(nr_objs, align); | |
806 | } | |
807 | *num = nr_objs; | |
808 | *left_over = slab_size - nr_objs*buffer_size - mgmt_size; | |
1da177e4 LT |
809 | } |
810 | ||
811 | #define slab_error(cachep, msg) __slab_error(__FUNCTION__, cachep, msg) | |
812 | ||
a737b3e2 AM |
813 | static void __slab_error(const char *function, struct kmem_cache *cachep, |
814 | char *msg) | |
1da177e4 LT |
815 | { |
816 | printk(KERN_ERR "slab error in %s(): cache `%s': %s\n", | |
b28a02de | 817 | function, cachep->name, msg); |
1da177e4 LT |
818 | dump_stack(); |
819 | } | |
820 | ||
8fce4d8e CL |
821 | #ifdef CONFIG_NUMA |
822 | /* | |
823 | * Special reaping functions for NUMA systems called from cache_reap(). | |
824 | * These take care of doing round robin flushing of alien caches (containing | |
825 | * objects freed on different nodes from which they were allocated) and the | |
826 | * flushing of remote pcps by calling drain_node_pages. | |
827 | */ | |
828 | static DEFINE_PER_CPU(unsigned long, reap_node); | |
829 | ||
830 | static void init_reap_node(int cpu) | |
831 | { | |
832 | int node; | |
833 | ||
834 | node = next_node(cpu_to_node(cpu), node_online_map); | |
835 | if (node == MAX_NUMNODES) | |
442295c9 | 836 | node = first_node(node_online_map); |
8fce4d8e CL |
837 | |
838 | __get_cpu_var(reap_node) = node; | |
839 | } | |
840 | ||
841 | static void next_reap_node(void) | |
842 | { | |
843 | int node = __get_cpu_var(reap_node); | |
844 | ||
845 | /* | |
846 | * Also drain per cpu pages on remote zones | |
847 | */ | |
848 | if (node != numa_node_id()) | |
849 | drain_node_pages(node); | |
850 | ||
851 | node = next_node(node, node_online_map); | |
852 | if (unlikely(node >= MAX_NUMNODES)) | |
853 | node = first_node(node_online_map); | |
854 | __get_cpu_var(reap_node) = node; | |
855 | } | |
856 | ||
857 | #else | |
858 | #define init_reap_node(cpu) do { } while (0) | |
859 | #define next_reap_node(void) do { } while (0) | |
860 | #endif | |
861 | ||
1da177e4 LT |
862 | /* |
863 | * Initiate the reap timer running on the target CPU. We run at around 1 to 2Hz | |
864 | * via the workqueue/eventd. | |
865 | * Add the CPU number into the expiration time to minimize the possibility of | |
866 | * the CPUs getting into lockstep and contending for the global cache chain | |
867 | * lock. | |
868 | */ | |
869 | static void __devinit start_cpu_timer(int cpu) | |
870 | { | |
871 | struct work_struct *reap_work = &per_cpu(reap_work, cpu); | |
872 | ||
873 | /* | |
874 | * When this gets called from do_initcalls via cpucache_init(), | |
875 | * init_workqueues() has already run, so keventd will be setup | |
876 | * at that time. | |
877 | */ | |
878 | if (keventd_up() && reap_work->func == NULL) { | |
8fce4d8e | 879 | init_reap_node(cpu); |
1da177e4 LT |
880 | INIT_WORK(reap_work, cache_reap, NULL); |
881 | schedule_delayed_work_on(cpu, reap_work, HZ + 3 * cpu); | |
882 | } | |
883 | } | |
884 | ||
e498be7d | 885 | static struct array_cache *alloc_arraycache(int node, int entries, |
b28a02de | 886 | int batchcount) |
1da177e4 | 887 | { |
b28a02de | 888 | int memsize = sizeof(void *) * entries + sizeof(struct array_cache); |
1da177e4 LT |
889 | struct array_cache *nc = NULL; |
890 | ||
e498be7d | 891 | nc = kmalloc_node(memsize, GFP_KERNEL, node); |
1da177e4 LT |
892 | if (nc) { |
893 | nc->avail = 0; | |
894 | nc->limit = entries; | |
895 | nc->batchcount = batchcount; | |
896 | nc->touched = 0; | |
e498be7d | 897 | spin_lock_init(&nc->lock); |
1da177e4 LT |
898 | } |
899 | return nc; | |
900 | } | |
901 | ||
3ded175a CL |
902 | /* |
903 | * Transfer objects in one arraycache to another. | |
904 | * Locking must be handled by the caller. | |
905 | * | |
906 | * Return the number of entries transferred. | |
907 | */ | |
908 | static int transfer_objects(struct array_cache *to, | |
909 | struct array_cache *from, unsigned int max) | |
910 | { | |
911 | /* Figure out how many entries to transfer */ | |
912 | int nr = min(min(from->avail, max), to->limit - to->avail); | |
913 | ||
914 | if (!nr) | |
915 | return 0; | |
916 | ||
917 | memcpy(to->entry + to->avail, from->entry + from->avail -nr, | |
918 | sizeof(void *) *nr); | |
919 | ||
920 | from->avail -= nr; | |
921 | to->avail += nr; | |
922 | to->touched = 1; | |
923 | return nr; | |
924 | } | |
925 | ||
e498be7d | 926 | #ifdef CONFIG_NUMA |
343e0d7a | 927 | static void *__cache_alloc_node(struct kmem_cache *, gfp_t, int); |
c61afb18 | 928 | static void *alternate_node_alloc(struct kmem_cache *, gfp_t); |
dc85da15 | 929 | |
5295a74c | 930 | static struct array_cache **alloc_alien_cache(int node, int limit) |
e498be7d CL |
931 | { |
932 | struct array_cache **ac_ptr; | |
b28a02de | 933 | int memsize = sizeof(void *) * MAX_NUMNODES; |
e498be7d CL |
934 | int i; |
935 | ||
936 | if (limit > 1) | |
937 | limit = 12; | |
938 | ac_ptr = kmalloc_node(memsize, GFP_KERNEL, node); | |
939 | if (ac_ptr) { | |
940 | for_each_node(i) { | |
941 | if (i == node || !node_online(i)) { | |
942 | ac_ptr[i] = NULL; | |
943 | continue; | |
944 | } | |
945 | ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d); | |
946 | if (!ac_ptr[i]) { | |
b28a02de | 947 | for (i--; i <= 0; i--) |
e498be7d CL |
948 | kfree(ac_ptr[i]); |
949 | kfree(ac_ptr); | |
950 | return NULL; | |
951 | } | |
952 | } | |
953 | } | |
954 | return ac_ptr; | |
955 | } | |
956 | ||
5295a74c | 957 | static void free_alien_cache(struct array_cache **ac_ptr) |
e498be7d CL |
958 | { |
959 | int i; | |
960 | ||
961 | if (!ac_ptr) | |
962 | return; | |
e498be7d | 963 | for_each_node(i) |
b28a02de | 964 | kfree(ac_ptr[i]); |
e498be7d CL |
965 | kfree(ac_ptr); |
966 | } | |
967 | ||
343e0d7a | 968 | static void __drain_alien_cache(struct kmem_cache *cachep, |
5295a74c | 969 | struct array_cache *ac, int node) |
e498be7d CL |
970 | { |
971 | struct kmem_list3 *rl3 = cachep->nodelists[node]; | |
972 | ||
973 | if (ac->avail) { | |
974 | spin_lock(&rl3->list_lock); | |
e00946fe CL |
975 | /* |
976 | * Stuff objects into the remote nodes shared array first. | |
977 | * That way we could avoid the overhead of putting the objects | |
978 | * into the free lists and getting them back later. | |
979 | */ | |
693f7d36 JS |
980 | if (rl3->shared) |
981 | transfer_objects(rl3->shared, ac, ac->limit); | |
e00946fe | 982 | |
ff69416e | 983 | free_block(cachep, ac->entry, ac->avail, node); |
e498be7d CL |
984 | ac->avail = 0; |
985 | spin_unlock(&rl3->list_lock); | |
986 | } | |
987 | } | |
988 | ||
8fce4d8e CL |
989 | /* |
990 | * Called from cache_reap() to regularly drain alien caches round robin. | |
991 | */ | |
992 | static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3) | |
993 | { | |
994 | int node = __get_cpu_var(reap_node); | |
995 | ||
996 | if (l3->alien) { | |
997 | struct array_cache *ac = l3->alien[node]; | |
e00946fe CL |
998 | |
999 | if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { | |
8fce4d8e CL |
1000 | __drain_alien_cache(cachep, ac, node); |
1001 | spin_unlock_irq(&ac->lock); | |
1002 | } | |
1003 | } | |
1004 | } | |
1005 | ||
a737b3e2 AM |
1006 | static void drain_alien_cache(struct kmem_cache *cachep, |
1007 | struct array_cache **alien) | |
e498be7d | 1008 | { |
b28a02de | 1009 | int i = 0; |
e498be7d CL |
1010 | struct array_cache *ac; |
1011 | unsigned long flags; | |
1012 | ||
1013 | for_each_online_node(i) { | |
4484ebf1 | 1014 | ac = alien[i]; |
e498be7d CL |
1015 | if (ac) { |
1016 | spin_lock_irqsave(&ac->lock, flags); | |
1017 | __drain_alien_cache(cachep, ac, i); | |
1018 | spin_unlock_irqrestore(&ac->lock, flags); | |
1019 | } | |
1020 | } | |
1021 | } | |
729bd0b7 PE |
1022 | |
1023 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) | |
1024 | { | |
1025 | struct slab *slabp = virt_to_slab(objp); | |
1026 | int nodeid = slabp->nodeid; | |
1027 | struct kmem_list3 *l3; | |
1028 | struct array_cache *alien = NULL; | |
1029 | ||
1030 | /* | |
1031 | * Make sure we are not freeing a object from another node to the array | |
1032 | * cache on this cpu. | |
1033 | */ | |
1034 | if (likely(slabp->nodeid == numa_node_id())) | |
1035 | return 0; | |
1036 | ||
1037 | l3 = cachep->nodelists[numa_node_id()]; | |
1038 | STATS_INC_NODEFREES(cachep); | |
1039 | if (l3->alien && l3->alien[nodeid]) { | |
1040 | alien = l3->alien[nodeid]; | |
1041 | spin_lock(&alien->lock); | |
1042 | if (unlikely(alien->avail == alien->limit)) { | |
1043 | STATS_INC_ACOVERFLOW(cachep); | |
1044 | __drain_alien_cache(cachep, alien, nodeid); | |
1045 | } | |
1046 | alien->entry[alien->avail++] = objp; | |
1047 | spin_unlock(&alien->lock); | |
1048 | } else { | |
1049 | spin_lock(&(cachep->nodelists[nodeid])->list_lock); | |
1050 | free_block(cachep, &objp, 1, nodeid); | |
1051 | spin_unlock(&(cachep->nodelists[nodeid])->list_lock); | |
1052 | } | |
1053 | return 1; | |
1054 | } | |
1055 | ||
e498be7d | 1056 | #else |
7a21ef6f | 1057 | |
4484ebf1 | 1058 | #define drain_alien_cache(cachep, alien) do { } while (0) |
8fce4d8e | 1059 | #define reap_alien(cachep, l3) do { } while (0) |
4484ebf1 | 1060 | |
7a21ef6f LT |
1061 | static inline struct array_cache **alloc_alien_cache(int node, int limit) |
1062 | { | |
1063 | return (struct array_cache **) 0x01020304ul; | |
1064 | } | |
1065 | ||
4484ebf1 RT |
1066 | static inline void free_alien_cache(struct array_cache **ac_ptr) |
1067 | { | |
1068 | } | |
7a21ef6f | 1069 | |
729bd0b7 PE |
1070 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) |
1071 | { | |
1072 | return 0; | |
1073 | } | |
1074 | ||
e498be7d CL |
1075 | #endif |
1076 | ||
9c7b216d | 1077 | static int __devinit cpuup_callback(struct notifier_block *nfb, |
b28a02de | 1078 | unsigned long action, void *hcpu) |
1da177e4 LT |
1079 | { |
1080 | long cpu = (long)hcpu; | |
343e0d7a | 1081 | struct kmem_cache *cachep; |
e498be7d CL |
1082 | struct kmem_list3 *l3 = NULL; |
1083 | int node = cpu_to_node(cpu); | |
1084 | int memsize = sizeof(struct kmem_list3); | |
1da177e4 LT |
1085 | |
1086 | switch (action) { | |
1087 | case CPU_UP_PREPARE: | |
fc0abb14 | 1088 | mutex_lock(&cache_chain_mutex); |
a737b3e2 AM |
1089 | /* |
1090 | * We need to do this right in the beginning since | |
e498be7d CL |
1091 | * alloc_arraycache's are going to use this list. |
1092 | * kmalloc_node allows us to add the slab to the right | |
1093 | * kmem_list3 and not this cpu's kmem_list3 | |
1094 | */ | |
1095 | ||
1da177e4 | 1096 | list_for_each_entry(cachep, &cache_chain, next) { |
a737b3e2 AM |
1097 | /* |
1098 | * Set up the size64 kmemlist for cpu before we can | |
e498be7d CL |
1099 | * begin anything. Make sure some other cpu on this |
1100 | * node has not already allocated this | |
1101 | */ | |
1102 | if (!cachep->nodelists[node]) { | |
a737b3e2 AM |
1103 | l3 = kmalloc_node(memsize, GFP_KERNEL, node); |
1104 | if (!l3) | |
e498be7d CL |
1105 | goto bad; |
1106 | kmem_list3_init(l3); | |
1107 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
b28a02de | 1108 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
e498be7d | 1109 | |
4484ebf1 RT |
1110 | /* |
1111 | * The l3s don't come and go as CPUs come and | |
1112 | * go. cache_chain_mutex is sufficient | |
1113 | * protection here. | |
1114 | */ | |
e498be7d CL |
1115 | cachep->nodelists[node] = l3; |
1116 | } | |
1da177e4 | 1117 | |
e498be7d CL |
1118 | spin_lock_irq(&cachep->nodelists[node]->list_lock); |
1119 | cachep->nodelists[node]->free_limit = | |
a737b3e2 AM |
1120 | (1 + nr_cpus_node(node)) * |
1121 | cachep->batchcount + cachep->num; | |
e498be7d CL |
1122 | spin_unlock_irq(&cachep->nodelists[node]->list_lock); |
1123 | } | |
1124 | ||
a737b3e2 AM |
1125 | /* |
1126 | * Now we can go ahead with allocating the shared arrays and | |
1127 | * array caches | |
1128 | */ | |
e498be7d | 1129 | list_for_each_entry(cachep, &cache_chain, next) { |
cd105df4 | 1130 | struct array_cache *nc; |
4484ebf1 RT |
1131 | struct array_cache *shared; |
1132 | struct array_cache **alien; | |
cd105df4 | 1133 | |
e498be7d | 1134 | nc = alloc_arraycache(node, cachep->limit, |
4484ebf1 | 1135 | cachep->batchcount); |
1da177e4 LT |
1136 | if (!nc) |
1137 | goto bad; | |
4484ebf1 RT |
1138 | shared = alloc_arraycache(node, |
1139 | cachep->shared * cachep->batchcount, | |
1140 | 0xbaadf00d); | |
1141 | if (!shared) | |
1142 | goto bad; | |
7a21ef6f | 1143 | |
4484ebf1 RT |
1144 | alien = alloc_alien_cache(node, cachep->limit); |
1145 | if (!alien) | |
1146 | goto bad; | |
1da177e4 | 1147 | cachep->array[cpu] = nc; |
e498be7d CL |
1148 | l3 = cachep->nodelists[node]; |
1149 | BUG_ON(!l3); | |
e498be7d | 1150 | |
4484ebf1 RT |
1151 | spin_lock_irq(&l3->list_lock); |
1152 | if (!l3->shared) { | |
1153 | /* | |
1154 | * We are serialised from CPU_DEAD or | |
1155 | * CPU_UP_CANCELLED by the cpucontrol lock | |
1156 | */ | |
1157 | l3->shared = shared; | |
1158 | shared = NULL; | |
e498be7d | 1159 | } |
4484ebf1 RT |
1160 | #ifdef CONFIG_NUMA |
1161 | if (!l3->alien) { | |
1162 | l3->alien = alien; | |
1163 | alien = NULL; | |
1164 | } | |
1165 | #endif | |
1166 | spin_unlock_irq(&l3->list_lock); | |
4484ebf1 RT |
1167 | kfree(shared); |
1168 | free_alien_cache(alien); | |
1da177e4 | 1169 | } |
fc0abb14 | 1170 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
1171 | break; |
1172 | case CPU_ONLINE: | |
1173 | start_cpu_timer(cpu); | |
1174 | break; | |
1175 | #ifdef CONFIG_HOTPLUG_CPU | |
1176 | case CPU_DEAD: | |
4484ebf1 RT |
1177 | /* |
1178 | * Even if all the cpus of a node are down, we don't free the | |
1179 | * kmem_list3 of any cache. This to avoid a race between | |
1180 | * cpu_down, and a kmalloc allocation from another cpu for | |
1181 | * memory from the node of the cpu going down. The list3 | |
1182 | * structure is usually allocated from kmem_cache_create() and | |
1183 | * gets destroyed at kmem_cache_destroy(). | |
1184 | */ | |
1da177e4 LT |
1185 | /* fall thru */ |
1186 | case CPU_UP_CANCELED: | |
fc0abb14 | 1187 | mutex_lock(&cache_chain_mutex); |
1da177e4 LT |
1188 | list_for_each_entry(cachep, &cache_chain, next) { |
1189 | struct array_cache *nc; | |
4484ebf1 RT |
1190 | struct array_cache *shared; |
1191 | struct array_cache **alien; | |
e498be7d | 1192 | cpumask_t mask; |
1da177e4 | 1193 | |
e498be7d | 1194 | mask = node_to_cpumask(node); |
1da177e4 LT |
1195 | /* cpu is dead; no one can alloc from it. */ |
1196 | nc = cachep->array[cpu]; | |
1197 | cachep->array[cpu] = NULL; | |
e498be7d CL |
1198 | l3 = cachep->nodelists[node]; |
1199 | ||
1200 | if (!l3) | |
4484ebf1 | 1201 | goto free_array_cache; |
e498be7d | 1202 | |
ca3b9b91 | 1203 | spin_lock_irq(&l3->list_lock); |
e498be7d CL |
1204 | |
1205 | /* Free limit for this kmem_list3 */ | |
1206 | l3->free_limit -= cachep->batchcount; | |
1207 | if (nc) | |
ff69416e | 1208 | free_block(cachep, nc->entry, nc->avail, node); |
e498be7d CL |
1209 | |
1210 | if (!cpus_empty(mask)) { | |
ca3b9b91 | 1211 | spin_unlock_irq(&l3->list_lock); |
4484ebf1 | 1212 | goto free_array_cache; |
b28a02de | 1213 | } |
e498be7d | 1214 | |
4484ebf1 RT |
1215 | shared = l3->shared; |
1216 | if (shared) { | |
e498be7d | 1217 | free_block(cachep, l3->shared->entry, |
b28a02de | 1218 | l3->shared->avail, node); |
e498be7d CL |
1219 | l3->shared = NULL; |
1220 | } | |
e498be7d | 1221 | |
4484ebf1 RT |
1222 | alien = l3->alien; |
1223 | l3->alien = NULL; | |
1224 | ||
1225 | spin_unlock_irq(&l3->list_lock); | |
1226 | ||
1227 | kfree(shared); | |
1228 | if (alien) { | |
1229 | drain_alien_cache(cachep, alien); | |
1230 | free_alien_cache(alien); | |
e498be7d | 1231 | } |
4484ebf1 | 1232 | free_array_cache: |
1da177e4 LT |
1233 | kfree(nc); |
1234 | } | |
4484ebf1 RT |
1235 | /* |
1236 | * In the previous loop, all the objects were freed to | |
1237 | * the respective cache's slabs, now we can go ahead and | |
1238 | * shrink each nodelist to its limit. | |
1239 | */ | |
1240 | list_for_each_entry(cachep, &cache_chain, next) { | |
1241 | l3 = cachep->nodelists[node]; | |
1242 | if (!l3) | |
1243 | continue; | |
1244 | spin_lock_irq(&l3->list_lock); | |
1245 | /* free slabs belonging to this node */ | |
1246 | __node_shrink(cachep, node); | |
1247 | spin_unlock_irq(&l3->list_lock); | |
1248 | } | |
fc0abb14 | 1249 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
1250 | break; |
1251 | #endif | |
1252 | } | |
1253 | return NOTIFY_OK; | |
a737b3e2 | 1254 | bad: |
fc0abb14 | 1255 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
1256 | return NOTIFY_BAD; |
1257 | } | |
1258 | ||
74b85f37 CS |
1259 | static struct notifier_block __cpuinitdata cpucache_notifier = { |
1260 | &cpuup_callback, NULL, 0 | |
1261 | }; | |
1da177e4 | 1262 | |
e498be7d CL |
1263 | /* |
1264 | * swap the static kmem_list3 with kmalloced memory | |
1265 | */ | |
a737b3e2 AM |
1266 | static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, |
1267 | int nodeid) | |
e498be7d CL |
1268 | { |
1269 | struct kmem_list3 *ptr; | |
1270 | ||
1271 | BUG_ON(cachep->nodelists[nodeid] != list); | |
1272 | ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid); | |
1273 | BUG_ON(!ptr); | |
1274 | ||
1275 | local_irq_disable(); | |
1276 | memcpy(ptr, list, sizeof(struct kmem_list3)); | |
1277 | MAKE_ALL_LISTS(cachep, ptr, nodeid); | |
1278 | cachep->nodelists[nodeid] = ptr; | |
1279 | local_irq_enable(); | |
1280 | } | |
1281 | ||
a737b3e2 AM |
1282 | /* |
1283 | * Initialisation. Called after the page allocator have been initialised and | |
1284 | * before smp_init(). | |
1da177e4 LT |
1285 | */ |
1286 | void __init kmem_cache_init(void) | |
1287 | { | |
1288 | size_t left_over; | |
1289 | struct cache_sizes *sizes; | |
1290 | struct cache_names *names; | |
e498be7d | 1291 | int i; |
07ed76b2 | 1292 | int order; |
e498be7d CL |
1293 | |
1294 | for (i = 0; i < NUM_INIT_LISTS; i++) { | |
1295 | kmem_list3_init(&initkmem_list3[i]); | |
1296 | if (i < MAX_NUMNODES) | |
1297 | cache_cache.nodelists[i] = NULL; | |
1298 | } | |
1da177e4 LT |
1299 | |
1300 | /* | |
1301 | * Fragmentation resistance on low memory - only use bigger | |
1302 | * page orders on machines with more than 32MB of memory. | |
1303 | */ | |
1304 | if (num_physpages > (32 << 20) >> PAGE_SHIFT) | |
1305 | slab_break_gfp_order = BREAK_GFP_ORDER_HI; | |
1306 | ||
1da177e4 LT |
1307 | /* Bootstrap is tricky, because several objects are allocated |
1308 | * from caches that do not exist yet: | |
a737b3e2 AM |
1309 | * 1) initialize the cache_cache cache: it contains the struct |
1310 | * kmem_cache structures of all caches, except cache_cache itself: | |
1311 | * cache_cache is statically allocated. | |
e498be7d CL |
1312 | * Initially an __init data area is used for the head array and the |
1313 | * kmem_list3 structures, it's replaced with a kmalloc allocated | |
1314 | * array at the end of the bootstrap. | |
1da177e4 | 1315 | * 2) Create the first kmalloc cache. |
343e0d7a | 1316 | * The struct kmem_cache for the new cache is allocated normally. |
e498be7d CL |
1317 | * An __init data area is used for the head array. |
1318 | * 3) Create the remaining kmalloc caches, with minimally sized | |
1319 | * head arrays. | |
1da177e4 LT |
1320 | * 4) Replace the __init data head arrays for cache_cache and the first |
1321 | * kmalloc cache with kmalloc allocated arrays. | |
e498be7d CL |
1322 | * 5) Replace the __init data for kmem_list3 for cache_cache and |
1323 | * the other cache's with kmalloc allocated memory. | |
1324 | * 6) Resize the head arrays of the kmalloc caches to their final sizes. | |
1da177e4 LT |
1325 | */ |
1326 | ||
1327 | /* 1) create the cache_cache */ | |
1da177e4 LT |
1328 | INIT_LIST_HEAD(&cache_chain); |
1329 | list_add(&cache_cache.next, &cache_chain); | |
1330 | cache_cache.colour_off = cache_line_size(); | |
1331 | cache_cache.array[smp_processor_id()] = &initarray_cache.cache; | |
e498be7d | 1332 | cache_cache.nodelists[numa_node_id()] = &initkmem_list3[CACHE_CACHE]; |
1da177e4 | 1333 | |
a737b3e2 AM |
1334 | cache_cache.buffer_size = ALIGN(cache_cache.buffer_size, |
1335 | cache_line_size()); | |
1da177e4 | 1336 | |
07ed76b2 JS |
1337 | for (order = 0; order < MAX_ORDER; order++) { |
1338 | cache_estimate(order, cache_cache.buffer_size, | |
1339 | cache_line_size(), 0, &left_over, &cache_cache.num); | |
1340 | if (cache_cache.num) | |
1341 | break; | |
1342 | } | |
40094fa6 | 1343 | BUG_ON(!cache_cache.num); |
07ed76b2 | 1344 | cache_cache.gfporder = order; |
b28a02de | 1345 | cache_cache.colour = left_over / cache_cache.colour_off; |
b28a02de PE |
1346 | cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) + |
1347 | sizeof(struct slab), cache_line_size()); | |
1da177e4 LT |
1348 | |
1349 | /* 2+3) create the kmalloc caches */ | |
1350 | sizes = malloc_sizes; | |
1351 | names = cache_names; | |
1352 | ||
a737b3e2 AM |
1353 | /* |
1354 | * Initialize the caches that provide memory for the array cache and the | |
1355 | * kmem_list3 structures first. Without this, further allocations will | |
1356 | * bug. | |
e498be7d CL |
1357 | */ |
1358 | ||
1359 | sizes[INDEX_AC].cs_cachep = kmem_cache_create(names[INDEX_AC].name, | |
a737b3e2 AM |
1360 | sizes[INDEX_AC].cs_size, |
1361 | ARCH_KMALLOC_MINALIGN, | |
1362 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, | |
1363 | NULL, NULL); | |
e498be7d | 1364 | |
a737b3e2 | 1365 | if (INDEX_AC != INDEX_L3) { |
e498be7d | 1366 | sizes[INDEX_L3].cs_cachep = |
a737b3e2 AM |
1367 | kmem_cache_create(names[INDEX_L3].name, |
1368 | sizes[INDEX_L3].cs_size, | |
1369 | ARCH_KMALLOC_MINALIGN, | |
1370 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, | |
1371 | NULL, NULL); | |
1372 | } | |
e498be7d | 1373 | |
e0a42726 IM |
1374 | slab_early_init = 0; |
1375 | ||
1da177e4 | 1376 | while (sizes->cs_size != ULONG_MAX) { |
e498be7d CL |
1377 | /* |
1378 | * For performance, all the general caches are L1 aligned. | |
1da177e4 LT |
1379 | * This should be particularly beneficial on SMP boxes, as it |
1380 | * eliminates "false sharing". | |
1381 | * Note for systems short on memory removing the alignment will | |
e498be7d CL |
1382 | * allow tighter packing of the smaller caches. |
1383 | */ | |
a737b3e2 | 1384 | if (!sizes->cs_cachep) { |
e498be7d | 1385 | sizes->cs_cachep = kmem_cache_create(names->name, |
a737b3e2 AM |
1386 | sizes->cs_size, |
1387 | ARCH_KMALLOC_MINALIGN, | |
1388 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, | |
1389 | NULL, NULL); | |
1390 | } | |
1da177e4 | 1391 | |
1da177e4 | 1392 | sizes->cs_dmacachep = kmem_cache_create(names->name_dma, |
a737b3e2 AM |
1393 | sizes->cs_size, |
1394 | ARCH_KMALLOC_MINALIGN, | |
1395 | ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| | |
1396 | SLAB_PANIC, | |
1397 | NULL, NULL); | |
1da177e4 LT |
1398 | sizes++; |
1399 | names++; | |
1400 | } | |
1401 | /* 4) Replace the bootstrap head arrays */ | |
1402 | { | |
b28a02de | 1403 | void *ptr; |
e498be7d | 1404 | |
1da177e4 | 1405 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); |
e498be7d | 1406 | |
1da177e4 | 1407 | local_irq_disable(); |
9a2dba4b PE |
1408 | BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); |
1409 | memcpy(ptr, cpu_cache_get(&cache_cache), | |
b28a02de | 1410 | sizeof(struct arraycache_init)); |
1da177e4 LT |
1411 | cache_cache.array[smp_processor_id()] = ptr; |
1412 | local_irq_enable(); | |
e498be7d | 1413 | |
1da177e4 | 1414 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); |
e498be7d | 1415 | |
1da177e4 | 1416 | local_irq_disable(); |
9a2dba4b | 1417 | BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep) |
b28a02de | 1418 | != &initarray_generic.cache); |
9a2dba4b | 1419 | memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), |
b28a02de | 1420 | sizeof(struct arraycache_init)); |
e498be7d | 1421 | malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = |
b28a02de | 1422 | ptr; |
1da177e4 LT |
1423 | local_irq_enable(); |
1424 | } | |
e498be7d CL |
1425 | /* 5) Replace the bootstrap kmem_list3's */ |
1426 | { | |
1427 | int node; | |
1428 | /* Replace the static kmem_list3 structures for the boot cpu */ | |
1429 | init_list(&cache_cache, &initkmem_list3[CACHE_CACHE], | |
b28a02de | 1430 | numa_node_id()); |
e498be7d CL |
1431 | |
1432 | for_each_online_node(node) { | |
1433 | init_list(malloc_sizes[INDEX_AC].cs_cachep, | |
b28a02de | 1434 | &initkmem_list3[SIZE_AC + node], node); |
e498be7d CL |
1435 | |
1436 | if (INDEX_AC != INDEX_L3) { | |
1437 | init_list(malloc_sizes[INDEX_L3].cs_cachep, | |
b28a02de PE |
1438 | &initkmem_list3[SIZE_L3 + node], |
1439 | node); | |
e498be7d CL |
1440 | } |
1441 | } | |
1442 | } | |
1da177e4 | 1443 | |
e498be7d | 1444 | /* 6) resize the head arrays to their final sizes */ |
1da177e4 | 1445 | { |
343e0d7a | 1446 | struct kmem_cache *cachep; |
fc0abb14 | 1447 | mutex_lock(&cache_chain_mutex); |
1da177e4 | 1448 | list_for_each_entry(cachep, &cache_chain, next) |
a737b3e2 | 1449 | enable_cpucache(cachep); |
fc0abb14 | 1450 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
1451 | } |
1452 | ||
1453 | /* Done! */ | |
1454 | g_cpucache_up = FULL; | |
1455 | ||
a737b3e2 AM |
1456 | /* |
1457 | * Register a cpu startup notifier callback that initializes | |
1458 | * cpu_cache_get for all new cpus | |
1da177e4 LT |
1459 | */ |
1460 | register_cpu_notifier(&cpucache_notifier); | |
1da177e4 | 1461 | |
a737b3e2 AM |
1462 | /* |
1463 | * The reap timers are started later, with a module init call: That part | |
1464 | * of the kernel is not yet operational. | |
1da177e4 LT |
1465 | */ |
1466 | } | |
1467 | ||
1468 | static int __init cpucache_init(void) | |
1469 | { | |
1470 | int cpu; | |
1471 | ||
a737b3e2 AM |
1472 | /* |
1473 | * Register the timers that return unneeded pages to the page allocator | |
1da177e4 | 1474 | */ |
e498be7d | 1475 | for_each_online_cpu(cpu) |
a737b3e2 | 1476 | start_cpu_timer(cpu); |
1da177e4 LT |
1477 | return 0; |
1478 | } | |
1da177e4 LT |
1479 | __initcall(cpucache_init); |
1480 | ||
1481 | /* | |
1482 | * Interface to system's page allocator. No need to hold the cache-lock. | |
1483 | * | |
1484 | * If we requested dmaable memory, we will get it. Even if we | |
1485 | * did not request dmaable memory, we might get it, but that | |
1486 | * would be relatively rare and ignorable. | |
1487 | */ | |
343e0d7a | 1488 | static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
1da177e4 LT |
1489 | { |
1490 | struct page *page; | |
e1b6aa6f | 1491 | int nr_pages; |
1da177e4 LT |
1492 | int i; |
1493 | ||
d6fef9da | 1494 | #ifndef CONFIG_MMU |
e1b6aa6f CH |
1495 | /* |
1496 | * Nommu uses slab's for process anonymous memory allocations, and thus | |
1497 | * requires __GFP_COMP to properly refcount higher order allocations | |
d6fef9da | 1498 | */ |
e1b6aa6f | 1499 | flags |= __GFP_COMP; |
d6fef9da | 1500 | #endif |
e1b6aa6f CH |
1501 | flags |= cachep->gfpflags; |
1502 | ||
1503 | page = alloc_pages_node(nodeid, flags, cachep->gfporder); | |
1da177e4 LT |
1504 | if (!page) |
1505 | return NULL; | |
1da177e4 | 1506 | |
e1b6aa6f | 1507 | nr_pages = (1 << cachep->gfporder); |
1da177e4 | 1508 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
e1b6aa6f CH |
1509 | atomic_add(nr_pages, &slab_reclaim_pages); |
1510 | add_page_state(nr_slab, nr_pages); | |
1511 | for (i = 0; i < nr_pages; i++) | |
1512 | __SetPageSlab(page + i); | |
1513 | return page_address(page); | |
1da177e4 LT |
1514 | } |
1515 | ||
1516 | /* | |
1517 | * Interface to system's page release. | |
1518 | */ | |
343e0d7a | 1519 | static void kmem_freepages(struct kmem_cache *cachep, void *addr) |
1da177e4 | 1520 | { |
b28a02de | 1521 | unsigned long i = (1 << cachep->gfporder); |
1da177e4 LT |
1522 | struct page *page = virt_to_page(addr); |
1523 | const unsigned long nr_freed = i; | |
1524 | ||
1525 | while (i--) { | |
f205b2fe NP |
1526 | BUG_ON(!PageSlab(page)); |
1527 | __ClearPageSlab(page); | |
1da177e4 LT |
1528 | page++; |
1529 | } | |
1530 | sub_page_state(nr_slab, nr_freed); | |
1531 | if (current->reclaim_state) | |
1532 | current->reclaim_state->reclaimed_slab += nr_freed; | |
1533 | free_pages((unsigned long)addr, cachep->gfporder); | |
b28a02de PE |
1534 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
1535 | atomic_sub(1 << cachep->gfporder, &slab_reclaim_pages); | |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | static void kmem_rcu_free(struct rcu_head *head) | |
1539 | { | |
b28a02de | 1540 | struct slab_rcu *slab_rcu = (struct slab_rcu *)head; |
343e0d7a | 1541 | struct kmem_cache *cachep = slab_rcu->cachep; |
1da177e4 LT |
1542 | |
1543 | kmem_freepages(cachep, slab_rcu->addr); | |
1544 | if (OFF_SLAB(cachep)) | |
1545 | kmem_cache_free(cachep->slabp_cache, slab_rcu); | |
1546 | } | |
1547 | ||
1548 | #if DEBUG | |
1549 | ||
1550 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
343e0d7a | 1551 | static void store_stackinfo(struct kmem_cache *cachep, unsigned long *addr, |
b28a02de | 1552 | unsigned long caller) |
1da177e4 | 1553 | { |
3dafccf2 | 1554 | int size = obj_size(cachep); |
1da177e4 | 1555 | |
3dafccf2 | 1556 | addr = (unsigned long *)&((char *)addr)[obj_offset(cachep)]; |
1da177e4 | 1557 | |
b28a02de | 1558 | if (size < 5 * sizeof(unsigned long)) |
1da177e4 LT |
1559 | return; |
1560 | ||
b28a02de PE |
1561 | *addr++ = 0x12345678; |
1562 | *addr++ = caller; | |
1563 | *addr++ = smp_processor_id(); | |
1564 | size -= 3 * sizeof(unsigned long); | |
1da177e4 LT |
1565 | { |
1566 | unsigned long *sptr = &caller; | |
1567 | unsigned long svalue; | |
1568 | ||
1569 | while (!kstack_end(sptr)) { | |
1570 | svalue = *sptr++; | |
1571 | if (kernel_text_address(svalue)) { | |
b28a02de | 1572 | *addr++ = svalue; |
1da177e4 LT |
1573 | size -= sizeof(unsigned long); |
1574 | if (size <= sizeof(unsigned long)) | |
1575 | break; | |
1576 | } | |
1577 | } | |
1578 | ||
1579 | } | |
b28a02de | 1580 | *addr++ = 0x87654321; |
1da177e4 LT |
1581 | } |
1582 | #endif | |
1583 | ||
343e0d7a | 1584 | static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val) |
1da177e4 | 1585 | { |
3dafccf2 MS |
1586 | int size = obj_size(cachep); |
1587 | addr = &((char *)addr)[obj_offset(cachep)]; | |
1da177e4 LT |
1588 | |
1589 | memset(addr, val, size); | |
b28a02de | 1590 | *(unsigned char *)(addr + size - 1) = POISON_END; |
1da177e4 LT |
1591 | } |
1592 | ||
1593 | static void dump_line(char *data, int offset, int limit) | |
1594 | { | |
1595 | int i; | |
1596 | printk(KERN_ERR "%03x:", offset); | |
a737b3e2 | 1597 | for (i = 0; i < limit; i++) |
b28a02de | 1598 | printk(" %02x", (unsigned char)data[offset + i]); |
1da177e4 LT |
1599 | printk("\n"); |
1600 | } | |
1601 | #endif | |
1602 | ||
1603 | #if DEBUG | |
1604 | ||
343e0d7a | 1605 | static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines) |
1da177e4 LT |
1606 | { |
1607 | int i, size; | |
1608 | char *realobj; | |
1609 | ||
1610 | if (cachep->flags & SLAB_RED_ZONE) { | |
1611 | printk(KERN_ERR "Redzone: 0x%lx/0x%lx.\n", | |
a737b3e2 AM |
1612 | *dbg_redzone1(cachep, objp), |
1613 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
1614 | } |
1615 | ||
1616 | if (cachep->flags & SLAB_STORE_USER) { | |
1617 | printk(KERN_ERR "Last user: [<%p>]", | |
a737b3e2 | 1618 | *dbg_userword(cachep, objp)); |
1da177e4 | 1619 | print_symbol("(%s)", |
a737b3e2 | 1620 | (unsigned long)*dbg_userword(cachep, objp)); |
1da177e4 LT |
1621 | printk("\n"); |
1622 | } | |
3dafccf2 MS |
1623 | realobj = (char *)objp + obj_offset(cachep); |
1624 | size = obj_size(cachep); | |
b28a02de | 1625 | for (i = 0; i < size && lines; i += 16, lines--) { |
1da177e4 LT |
1626 | int limit; |
1627 | limit = 16; | |
b28a02de PE |
1628 | if (i + limit > size) |
1629 | limit = size - i; | |
1da177e4 LT |
1630 | dump_line(realobj, i, limit); |
1631 | } | |
1632 | } | |
1633 | ||
343e0d7a | 1634 | static void check_poison_obj(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
1635 | { |
1636 | char *realobj; | |
1637 | int size, i; | |
1638 | int lines = 0; | |
1639 | ||
3dafccf2 MS |
1640 | realobj = (char *)objp + obj_offset(cachep); |
1641 | size = obj_size(cachep); | |
1da177e4 | 1642 | |
b28a02de | 1643 | for (i = 0; i < size; i++) { |
1da177e4 | 1644 | char exp = POISON_FREE; |
b28a02de | 1645 | if (i == size - 1) |
1da177e4 LT |
1646 | exp = POISON_END; |
1647 | if (realobj[i] != exp) { | |
1648 | int limit; | |
1649 | /* Mismatch ! */ | |
1650 | /* Print header */ | |
1651 | if (lines == 0) { | |
b28a02de | 1652 | printk(KERN_ERR |
a737b3e2 AM |
1653 | "Slab corruption: start=%p, len=%d\n", |
1654 | realobj, size); | |
1da177e4 LT |
1655 | print_objinfo(cachep, objp, 0); |
1656 | } | |
1657 | /* Hexdump the affected line */ | |
b28a02de | 1658 | i = (i / 16) * 16; |
1da177e4 | 1659 | limit = 16; |
b28a02de PE |
1660 | if (i + limit > size) |
1661 | limit = size - i; | |
1da177e4 LT |
1662 | dump_line(realobj, i, limit); |
1663 | i += 16; | |
1664 | lines++; | |
1665 | /* Limit to 5 lines */ | |
1666 | if (lines > 5) | |
1667 | break; | |
1668 | } | |
1669 | } | |
1670 | if (lines != 0) { | |
1671 | /* Print some data about the neighboring objects, if they | |
1672 | * exist: | |
1673 | */ | |
6ed5eb22 | 1674 | struct slab *slabp = virt_to_slab(objp); |
8fea4e96 | 1675 | unsigned int objnr; |
1da177e4 | 1676 | |
8fea4e96 | 1677 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 | 1678 | if (objnr) { |
8fea4e96 | 1679 | objp = index_to_obj(cachep, slabp, objnr - 1); |
3dafccf2 | 1680 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 1681 | printk(KERN_ERR "Prev obj: start=%p, len=%d\n", |
b28a02de | 1682 | realobj, size); |
1da177e4 LT |
1683 | print_objinfo(cachep, objp, 2); |
1684 | } | |
b28a02de | 1685 | if (objnr + 1 < cachep->num) { |
8fea4e96 | 1686 | objp = index_to_obj(cachep, slabp, objnr + 1); |
3dafccf2 | 1687 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 1688 | printk(KERN_ERR "Next obj: start=%p, len=%d\n", |
b28a02de | 1689 | realobj, size); |
1da177e4 LT |
1690 | print_objinfo(cachep, objp, 2); |
1691 | } | |
1692 | } | |
1693 | } | |
1694 | #endif | |
1695 | ||
12dd36fa MD |
1696 | #if DEBUG |
1697 | /** | |
911851e6 RD |
1698 | * slab_destroy_objs - destroy a slab and its objects |
1699 | * @cachep: cache pointer being destroyed | |
1700 | * @slabp: slab pointer being destroyed | |
1701 | * | |
1702 | * Call the registered destructor for each object in a slab that is being | |
1703 | * destroyed. | |
1da177e4 | 1704 | */ |
343e0d7a | 1705 | static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 | 1706 | { |
1da177e4 LT |
1707 | int i; |
1708 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 1709 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
1710 | |
1711 | if (cachep->flags & SLAB_POISON) { | |
1712 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
a737b3e2 AM |
1713 | if (cachep->buffer_size % PAGE_SIZE == 0 && |
1714 | OFF_SLAB(cachep)) | |
b28a02de | 1715 | kernel_map_pages(virt_to_page(objp), |
a737b3e2 | 1716 | cachep->buffer_size / PAGE_SIZE, 1); |
1da177e4 LT |
1717 | else |
1718 | check_poison_obj(cachep, objp); | |
1719 | #else | |
1720 | check_poison_obj(cachep, objp); | |
1721 | #endif | |
1722 | } | |
1723 | if (cachep->flags & SLAB_RED_ZONE) { | |
1724 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) | |
1725 | slab_error(cachep, "start of a freed object " | |
b28a02de | 1726 | "was overwritten"); |
1da177e4 LT |
1727 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) |
1728 | slab_error(cachep, "end of a freed object " | |
b28a02de | 1729 | "was overwritten"); |
1da177e4 LT |
1730 | } |
1731 | if (cachep->dtor && !(cachep->flags & SLAB_POISON)) | |
3dafccf2 | 1732 | (cachep->dtor) (objp + obj_offset(cachep), cachep, 0); |
1da177e4 | 1733 | } |
12dd36fa | 1734 | } |
1da177e4 | 1735 | #else |
343e0d7a | 1736 | static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa | 1737 | { |
1da177e4 LT |
1738 | if (cachep->dtor) { |
1739 | int i; | |
1740 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 1741 | void *objp = index_to_obj(cachep, slabp, i); |
b28a02de | 1742 | (cachep->dtor) (objp, cachep, 0); |
1da177e4 LT |
1743 | } |
1744 | } | |
12dd36fa | 1745 | } |
1da177e4 LT |
1746 | #endif |
1747 | ||
911851e6 RD |
1748 | /** |
1749 | * slab_destroy - destroy and release all objects in a slab | |
1750 | * @cachep: cache pointer being destroyed | |
1751 | * @slabp: slab pointer being destroyed | |
1752 | * | |
12dd36fa | 1753 | * Destroy all the objs in a slab, and release the mem back to the system. |
a737b3e2 AM |
1754 | * Before calling the slab must have been unlinked from the cache. The |
1755 | * cache-lock is not held/needed. | |
12dd36fa | 1756 | */ |
343e0d7a | 1757 | static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa MD |
1758 | { |
1759 | void *addr = slabp->s_mem - slabp->colouroff; | |
1760 | ||
1761 | slab_destroy_objs(cachep, slabp); | |
1da177e4 LT |
1762 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) { |
1763 | struct slab_rcu *slab_rcu; | |
1764 | ||
b28a02de | 1765 | slab_rcu = (struct slab_rcu *)slabp; |
1da177e4 LT |
1766 | slab_rcu->cachep = cachep; |
1767 | slab_rcu->addr = addr; | |
1768 | call_rcu(&slab_rcu->head, kmem_rcu_free); | |
1769 | } else { | |
1770 | kmem_freepages(cachep, addr); | |
1771 | if (OFF_SLAB(cachep)) | |
1772 | kmem_cache_free(cachep->slabp_cache, slabp); | |
1773 | } | |
1774 | } | |
1775 | ||
a737b3e2 AM |
1776 | /* |
1777 | * For setting up all the kmem_list3s for cache whose buffer_size is same as | |
1778 | * size of kmem_list3. | |
1779 | */ | |
343e0d7a | 1780 | static void set_up_list3s(struct kmem_cache *cachep, int index) |
e498be7d CL |
1781 | { |
1782 | int node; | |
1783 | ||
1784 | for_each_online_node(node) { | |
b28a02de | 1785 | cachep->nodelists[node] = &initkmem_list3[index + node]; |
e498be7d | 1786 | cachep->nodelists[node]->next_reap = jiffies + |
b28a02de PE |
1787 | REAPTIMEOUT_LIST3 + |
1788 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
e498be7d CL |
1789 | } |
1790 | } | |
1791 | ||
4d268eba | 1792 | /** |
a70773dd RD |
1793 | * calculate_slab_order - calculate size (page order) of slabs |
1794 | * @cachep: pointer to the cache that is being created | |
1795 | * @size: size of objects to be created in this cache. | |
1796 | * @align: required alignment for the objects. | |
1797 | * @flags: slab allocation flags | |
1798 | * | |
1799 | * Also calculates the number of objects per slab. | |
4d268eba PE |
1800 | * |
1801 | * This could be made much more intelligent. For now, try to avoid using | |
1802 | * high order pages for slabs. When the gfp() functions are more friendly | |
1803 | * towards high-order requests, this should be changed. | |
1804 | */ | |
a737b3e2 | 1805 | static size_t calculate_slab_order(struct kmem_cache *cachep, |
ee13d785 | 1806 | size_t size, size_t align, unsigned long flags) |
4d268eba | 1807 | { |
b1ab41c4 | 1808 | unsigned long offslab_limit; |
4d268eba | 1809 | size_t left_over = 0; |
9888e6fa | 1810 | int gfporder; |
4d268eba | 1811 | |
a737b3e2 | 1812 | for (gfporder = 0; gfporder <= MAX_GFP_ORDER; gfporder++) { |
4d268eba PE |
1813 | unsigned int num; |
1814 | size_t remainder; | |
1815 | ||
9888e6fa | 1816 | cache_estimate(gfporder, size, align, flags, &remainder, &num); |
4d268eba PE |
1817 | if (!num) |
1818 | continue; | |
9888e6fa | 1819 | |
b1ab41c4 IM |
1820 | if (flags & CFLGS_OFF_SLAB) { |
1821 | /* | |
1822 | * Max number of objs-per-slab for caches which | |
1823 | * use off-slab slabs. Needed to avoid a possible | |
1824 | * looping condition in cache_grow(). | |
1825 | */ | |
1826 | offslab_limit = size - sizeof(struct slab); | |
1827 | offslab_limit /= sizeof(kmem_bufctl_t); | |
1828 | ||
1829 | if (num > offslab_limit) | |
1830 | break; | |
1831 | } | |
4d268eba | 1832 | |
9888e6fa | 1833 | /* Found something acceptable - save it away */ |
4d268eba | 1834 | cachep->num = num; |
9888e6fa | 1835 | cachep->gfporder = gfporder; |
4d268eba PE |
1836 | left_over = remainder; |
1837 | ||
f78bb8ad LT |
1838 | /* |
1839 | * A VFS-reclaimable slab tends to have most allocations | |
1840 | * as GFP_NOFS and we really don't want to have to be allocating | |
1841 | * higher-order pages when we are unable to shrink dcache. | |
1842 | */ | |
1843 | if (flags & SLAB_RECLAIM_ACCOUNT) | |
1844 | break; | |
1845 | ||
4d268eba PE |
1846 | /* |
1847 | * Large number of objects is good, but very large slabs are | |
1848 | * currently bad for the gfp()s. | |
1849 | */ | |
9888e6fa | 1850 | if (gfporder >= slab_break_gfp_order) |
4d268eba PE |
1851 | break; |
1852 | ||
9888e6fa LT |
1853 | /* |
1854 | * Acceptable internal fragmentation? | |
1855 | */ | |
a737b3e2 | 1856 | if (left_over * 8 <= (PAGE_SIZE << gfporder)) |
4d268eba PE |
1857 | break; |
1858 | } | |
1859 | return left_over; | |
1860 | } | |
1861 | ||
f30cf7d1 PE |
1862 | static void setup_cpu_cache(struct kmem_cache *cachep) |
1863 | { | |
1864 | if (g_cpucache_up == FULL) { | |
1865 | enable_cpucache(cachep); | |
1866 | return; | |
1867 | } | |
1868 | if (g_cpucache_up == NONE) { | |
1869 | /* | |
1870 | * Note: the first kmem_cache_create must create the cache | |
1871 | * that's used by kmalloc(24), otherwise the creation of | |
1872 | * further caches will BUG(). | |
1873 | */ | |
1874 | cachep->array[smp_processor_id()] = &initarray_generic.cache; | |
1875 | ||
1876 | /* | |
1877 | * If the cache that's used by kmalloc(sizeof(kmem_list3)) is | |
1878 | * the first cache, then we need to set up all its list3s, | |
1879 | * otherwise the creation of further caches will BUG(). | |
1880 | */ | |
1881 | set_up_list3s(cachep, SIZE_AC); | |
1882 | if (INDEX_AC == INDEX_L3) | |
1883 | g_cpucache_up = PARTIAL_L3; | |
1884 | else | |
1885 | g_cpucache_up = PARTIAL_AC; | |
1886 | } else { | |
1887 | cachep->array[smp_processor_id()] = | |
1888 | kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); | |
1889 | ||
1890 | if (g_cpucache_up == PARTIAL_AC) { | |
1891 | set_up_list3s(cachep, SIZE_L3); | |
1892 | g_cpucache_up = PARTIAL_L3; | |
1893 | } else { | |
1894 | int node; | |
1895 | for_each_online_node(node) { | |
1896 | cachep->nodelists[node] = | |
1897 | kmalloc_node(sizeof(struct kmem_list3), | |
1898 | GFP_KERNEL, node); | |
1899 | BUG_ON(!cachep->nodelists[node]); | |
1900 | kmem_list3_init(cachep->nodelists[node]); | |
1901 | } | |
1902 | } | |
1903 | } | |
1904 | cachep->nodelists[numa_node_id()]->next_reap = | |
1905 | jiffies + REAPTIMEOUT_LIST3 + | |
1906 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
1907 | ||
1908 | cpu_cache_get(cachep)->avail = 0; | |
1909 | cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; | |
1910 | cpu_cache_get(cachep)->batchcount = 1; | |
1911 | cpu_cache_get(cachep)->touched = 0; | |
1912 | cachep->batchcount = 1; | |
1913 | cachep->limit = BOOT_CPUCACHE_ENTRIES; | |
1914 | } | |
1915 | ||
1da177e4 LT |
1916 | /** |
1917 | * kmem_cache_create - Create a cache. | |
1918 | * @name: A string which is used in /proc/slabinfo to identify this cache. | |
1919 | * @size: The size of objects to be created in this cache. | |
1920 | * @align: The required alignment for the objects. | |
1921 | * @flags: SLAB flags | |
1922 | * @ctor: A constructor for the objects. | |
1923 | * @dtor: A destructor for the objects. | |
1924 | * | |
1925 | * Returns a ptr to the cache on success, NULL on failure. | |
1926 | * Cannot be called within a int, but can be interrupted. | |
1927 | * The @ctor is run when new pages are allocated by the cache | |
1928 | * and the @dtor is run before the pages are handed back. | |
1929 | * | |
1930 | * @name must be valid until the cache is destroyed. This implies that | |
a737b3e2 AM |
1931 | * the module calling this has to destroy the cache before getting unloaded. |
1932 | * | |
1da177e4 LT |
1933 | * The flags are |
1934 | * | |
1935 | * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) | |
1936 | * to catch references to uninitialised memory. | |
1937 | * | |
1938 | * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check | |
1939 | * for buffer overruns. | |
1940 | * | |
1da177e4 LT |
1941 | * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware |
1942 | * cacheline. This can be beneficial if you're counting cycles as closely | |
1943 | * as davem. | |
1944 | */ | |
343e0d7a | 1945 | struct kmem_cache * |
1da177e4 | 1946 | kmem_cache_create (const char *name, size_t size, size_t align, |
a737b3e2 AM |
1947 | unsigned long flags, |
1948 | void (*ctor)(void*, struct kmem_cache *, unsigned long), | |
343e0d7a | 1949 | void (*dtor)(void*, struct kmem_cache *, unsigned long)) |
1da177e4 LT |
1950 | { |
1951 | size_t left_over, slab_size, ralign; | |
7a7c381d | 1952 | struct kmem_cache *cachep = NULL, *pc; |
1da177e4 LT |
1953 | |
1954 | /* | |
1955 | * Sanity checks... these are all serious usage bugs. | |
1956 | */ | |
a737b3e2 | 1957 | if (!name || in_interrupt() || (size < BYTES_PER_WORD) || |
b28a02de | 1958 | (size > (1 << MAX_OBJ_ORDER) * PAGE_SIZE) || (dtor && !ctor)) { |
a737b3e2 AM |
1959 | printk(KERN_ERR "%s: Early error in slab %s\n", __FUNCTION__, |
1960 | name); | |
b28a02de PE |
1961 | BUG(); |
1962 | } | |
1da177e4 | 1963 | |
f0188f47 RT |
1964 | /* |
1965 | * Prevent CPUs from coming and going. | |
1966 | * lock_cpu_hotplug() nests outside cache_chain_mutex | |
1967 | */ | |
1968 | lock_cpu_hotplug(); | |
1969 | ||
fc0abb14 | 1970 | mutex_lock(&cache_chain_mutex); |
4f12bb4f | 1971 | |
7a7c381d | 1972 | list_for_each_entry(pc, &cache_chain, next) { |
4f12bb4f AM |
1973 | mm_segment_t old_fs = get_fs(); |
1974 | char tmp; | |
1975 | int res; | |
1976 | ||
1977 | /* | |
1978 | * This happens when the module gets unloaded and doesn't | |
1979 | * destroy its slab cache and no-one else reuses the vmalloc | |
1980 | * area of the module. Print a warning. | |
1981 | */ | |
1982 | set_fs(KERNEL_DS); | |
1983 | res = __get_user(tmp, pc->name); | |
1984 | set_fs(old_fs); | |
1985 | if (res) { | |
1986 | printk("SLAB: cache with size %d has lost its name\n", | |
3dafccf2 | 1987 | pc->buffer_size); |
4f12bb4f AM |
1988 | continue; |
1989 | } | |
1990 | ||
b28a02de | 1991 | if (!strcmp(pc->name, name)) { |
4f12bb4f AM |
1992 | printk("kmem_cache_create: duplicate cache %s\n", name); |
1993 | dump_stack(); | |
1994 | goto oops; | |
1995 | } | |
1996 | } | |
1997 | ||
1da177e4 LT |
1998 | #if DEBUG |
1999 | WARN_ON(strchr(name, ' ')); /* It confuses parsers */ | |
2000 | if ((flags & SLAB_DEBUG_INITIAL) && !ctor) { | |
2001 | /* No constructor, but inital state check requested */ | |
2002 | printk(KERN_ERR "%s: No con, but init state check " | |
b28a02de | 2003 | "requested - %s\n", __FUNCTION__, name); |
1da177e4 LT |
2004 | flags &= ~SLAB_DEBUG_INITIAL; |
2005 | } | |
1da177e4 LT |
2006 | #if FORCED_DEBUG |
2007 | /* | |
2008 | * Enable redzoning and last user accounting, except for caches with | |
2009 | * large objects, if the increased size would increase the object size | |
2010 | * above the next power of two: caches with object sizes just above a | |
2011 | * power of two have a significant amount of internal fragmentation. | |
2012 | */ | |
a737b3e2 | 2013 | if (size < 4096 || fls(size - 1) == fls(size-1 + 3 * BYTES_PER_WORD)) |
b28a02de | 2014 | flags |= SLAB_RED_ZONE | SLAB_STORE_USER; |
1da177e4 LT |
2015 | if (!(flags & SLAB_DESTROY_BY_RCU)) |
2016 | flags |= SLAB_POISON; | |
2017 | #endif | |
2018 | if (flags & SLAB_DESTROY_BY_RCU) | |
2019 | BUG_ON(flags & SLAB_POISON); | |
2020 | #endif | |
2021 | if (flags & SLAB_DESTROY_BY_RCU) | |
2022 | BUG_ON(dtor); | |
2023 | ||
2024 | /* | |
a737b3e2 AM |
2025 | * Always checks flags, a caller might be expecting debug support which |
2026 | * isn't available. | |
1da177e4 | 2027 | */ |
40094fa6 | 2028 | BUG_ON(flags & ~CREATE_MASK); |
1da177e4 | 2029 | |
a737b3e2 AM |
2030 | /* |
2031 | * Check that size is in terms of words. This is needed to avoid | |
1da177e4 LT |
2032 | * unaligned accesses for some archs when redzoning is used, and makes |
2033 | * sure any on-slab bufctl's are also correctly aligned. | |
2034 | */ | |
b28a02de PE |
2035 | if (size & (BYTES_PER_WORD - 1)) { |
2036 | size += (BYTES_PER_WORD - 1); | |
2037 | size &= ~(BYTES_PER_WORD - 1); | |
1da177e4 LT |
2038 | } |
2039 | ||
a737b3e2 AM |
2040 | /* calculate the final buffer alignment: */ |
2041 | ||
1da177e4 LT |
2042 | /* 1) arch recommendation: can be overridden for debug */ |
2043 | if (flags & SLAB_HWCACHE_ALIGN) { | |
a737b3e2 AM |
2044 | /* |
2045 | * Default alignment: as specified by the arch code. Except if | |
2046 | * an object is really small, then squeeze multiple objects into | |
2047 | * one cacheline. | |
1da177e4 LT |
2048 | */ |
2049 | ralign = cache_line_size(); | |
b28a02de | 2050 | while (size <= ralign / 2) |
1da177e4 LT |
2051 | ralign /= 2; |
2052 | } else { | |
2053 | ralign = BYTES_PER_WORD; | |
2054 | } | |
2055 | /* 2) arch mandated alignment: disables debug if necessary */ | |
2056 | if (ralign < ARCH_SLAB_MINALIGN) { | |
2057 | ralign = ARCH_SLAB_MINALIGN; | |
2058 | if (ralign > BYTES_PER_WORD) | |
b28a02de | 2059 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); |
1da177e4 LT |
2060 | } |
2061 | /* 3) caller mandated alignment: disables debug if necessary */ | |
2062 | if (ralign < align) { | |
2063 | ralign = align; | |
2064 | if (ralign > BYTES_PER_WORD) | |
b28a02de | 2065 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); |
1da177e4 | 2066 | } |
a737b3e2 AM |
2067 | /* |
2068 | * 4) Store it. Note that the debug code below can reduce | |
1da177e4 LT |
2069 | * the alignment to BYTES_PER_WORD. |
2070 | */ | |
2071 | align = ralign; | |
2072 | ||
2073 | /* Get cache's description obj. */ | |
c5e3b83e | 2074 | cachep = kmem_cache_zalloc(&cache_cache, SLAB_KERNEL); |
1da177e4 | 2075 | if (!cachep) |
4f12bb4f | 2076 | goto oops; |
1da177e4 LT |
2077 | |
2078 | #if DEBUG | |
3dafccf2 | 2079 | cachep->obj_size = size; |
1da177e4 LT |
2080 | |
2081 | if (flags & SLAB_RED_ZONE) { | |
2082 | /* redzoning only works with word aligned caches */ | |
2083 | align = BYTES_PER_WORD; | |
2084 | ||
2085 | /* add space for red zone words */ | |
3dafccf2 | 2086 | cachep->obj_offset += BYTES_PER_WORD; |
b28a02de | 2087 | size += 2 * BYTES_PER_WORD; |
1da177e4 LT |
2088 | } |
2089 | if (flags & SLAB_STORE_USER) { | |
2090 | /* user store requires word alignment and | |
2091 | * one word storage behind the end of the real | |
2092 | * object. | |
2093 | */ | |
2094 | align = BYTES_PER_WORD; | |
2095 | size += BYTES_PER_WORD; | |
2096 | } | |
2097 | #if FORCED_DEBUG && defined(CONFIG_DEBUG_PAGEALLOC) | |
b28a02de | 2098 | if (size >= malloc_sizes[INDEX_L3 + 1].cs_size |
3dafccf2 MS |
2099 | && cachep->obj_size > cache_line_size() && size < PAGE_SIZE) { |
2100 | cachep->obj_offset += PAGE_SIZE - size; | |
1da177e4 LT |
2101 | size = PAGE_SIZE; |
2102 | } | |
2103 | #endif | |
2104 | #endif | |
2105 | ||
e0a42726 IM |
2106 | /* |
2107 | * Determine if the slab management is 'on' or 'off' slab. | |
2108 | * (bootstrapping cannot cope with offslab caches so don't do | |
2109 | * it too early on.) | |
2110 | */ | |
2111 | if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init) | |
1da177e4 LT |
2112 | /* |
2113 | * Size is large, assume best to place the slab management obj | |
2114 | * off-slab (should allow better packing of objs). | |
2115 | */ | |
2116 | flags |= CFLGS_OFF_SLAB; | |
2117 | ||
2118 | size = ALIGN(size, align); | |
2119 | ||
f78bb8ad | 2120 | left_over = calculate_slab_order(cachep, size, align, flags); |
1da177e4 LT |
2121 | |
2122 | if (!cachep->num) { | |
2123 | printk("kmem_cache_create: couldn't create cache %s.\n", name); | |
2124 | kmem_cache_free(&cache_cache, cachep); | |
2125 | cachep = NULL; | |
4f12bb4f | 2126 | goto oops; |
1da177e4 | 2127 | } |
b28a02de PE |
2128 | slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) |
2129 | + sizeof(struct slab), align); | |
1da177e4 LT |
2130 | |
2131 | /* | |
2132 | * If the slab has been placed off-slab, and we have enough space then | |
2133 | * move it on-slab. This is at the expense of any extra colouring. | |
2134 | */ | |
2135 | if (flags & CFLGS_OFF_SLAB && left_over >= slab_size) { | |
2136 | flags &= ~CFLGS_OFF_SLAB; | |
2137 | left_over -= slab_size; | |
2138 | } | |
2139 | ||
2140 | if (flags & CFLGS_OFF_SLAB) { | |
2141 | /* really off slab. No need for manual alignment */ | |
b28a02de PE |
2142 | slab_size = |
2143 | cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab); | |
1da177e4 LT |
2144 | } |
2145 | ||
2146 | cachep->colour_off = cache_line_size(); | |
2147 | /* Offset must be a multiple of the alignment. */ | |
2148 | if (cachep->colour_off < align) | |
2149 | cachep->colour_off = align; | |
b28a02de | 2150 | cachep->colour = left_over / cachep->colour_off; |
1da177e4 LT |
2151 | cachep->slab_size = slab_size; |
2152 | cachep->flags = flags; | |
2153 | cachep->gfpflags = 0; | |
2154 | if (flags & SLAB_CACHE_DMA) | |
2155 | cachep->gfpflags |= GFP_DMA; | |
3dafccf2 | 2156 | cachep->buffer_size = size; |
1da177e4 LT |
2157 | |
2158 | if (flags & CFLGS_OFF_SLAB) | |
b2d55073 | 2159 | cachep->slabp_cache = kmem_find_general_cachep(slab_size, 0u); |
1da177e4 LT |
2160 | cachep->ctor = ctor; |
2161 | cachep->dtor = dtor; | |
2162 | cachep->name = name; | |
2163 | ||
1da177e4 | 2164 | |
f30cf7d1 | 2165 | setup_cpu_cache(cachep); |
1da177e4 | 2166 | |
1da177e4 LT |
2167 | /* cache setup completed, link it into the list */ |
2168 | list_add(&cachep->next, &cache_chain); | |
a737b3e2 | 2169 | oops: |
1da177e4 LT |
2170 | if (!cachep && (flags & SLAB_PANIC)) |
2171 | panic("kmem_cache_create(): failed to create slab `%s'\n", | |
b28a02de | 2172 | name); |
fc0abb14 | 2173 | mutex_unlock(&cache_chain_mutex); |
f0188f47 | 2174 | unlock_cpu_hotplug(); |
1da177e4 LT |
2175 | return cachep; |
2176 | } | |
2177 | EXPORT_SYMBOL(kmem_cache_create); | |
2178 | ||
2179 | #if DEBUG | |
2180 | static void check_irq_off(void) | |
2181 | { | |
2182 | BUG_ON(!irqs_disabled()); | |
2183 | } | |
2184 | ||
2185 | static void check_irq_on(void) | |
2186 | { | |
2187 | BUG_ON(irqs_disabled()); | |
2188 | } | |
2189 | ||
343e0d7a | 2190 | static void check_spinlock_acquired(struct kmem_cache *cachep) |
1da177e4 LT |
2191 | { |
2192 | #ifdef CONFIG_SMP | |
2193 | check_irq_off(); | |
e498be7d | 2194 | assert_spin_locked(&cachep->nodelists[numa_node_id()]->list_lock); |
1da177e4 LT |
2195 | #endif |
2196 | } | |
e498be7d | 2197 | |
343e0d7a | 2198 | static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node) |
e498be7d CL |
2199 | { |
2200 | #ifdef CONFIG_SMP | |
2201 | check_irq_off(); | |
2202 | assert_spin_locked(&cachep->nodelists[node]->list_lock); | |
2203 | #endif | |
2204 | } | |
2205 | ||
1da177e4 LT |
2206 | #else |
2207 | #define check_irq_off() do { } while(0) | |
2208 | #define check_irq_on() do { } while(0) | |
2209 | #define check_spinlock_acquired(x) do { } while(0) | |
e498be7d | 2210 | #define check_spinlock_acquired_node(x, y) do { } while(0) |
1da177e4 LT |
2211 | #endif |
2212 | ||
aab2207c CL |
2213 | static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, |
2214 | struct array_cache *ac, | |
2215 | int force, int node); | |
2216 | ||
1da177e4 LT |
2217 | static void do_drain(void *arg) |
2218 | { | |
a737b3e2 | 2219 | struct kmem_cache *cachep = arg; |
1da177e4 | 2220 | struct array_cache *ac; |
ff69416e | 2221 | int node = numa_node_id(); |
1da177e4 LT |
2222 | |
2223 | check_irq_off(); | |
9a2dba4b | 2224 | ac = cpu_cache_get(cachep); |
ff69416e CL |
2225 | spin_lock(&cachep->nodelists[node]->list_lock); |
2226 | free_block(cachep, ac->entry, ac->avail, node); | |
2227 | spin_unlock(&cachep->nodelists[node]->list_lock); | |
1da177e4 LT |
2228 | ac->avail = 0; |
2229 | } | |
2230 | ||
343e0d7a | 2231 | static void drain_cpu_caches(struct kmem_cache *cachep) |
1da177e4 | 2232 | { |
e498be7d CL |
2233 | struct kmem_list3 *l3; |
2234 | int node; | |
2235 | ||
a07fa394 | 2236 | on_each_cpu(do_drain, cachep, 1, 1); |
1da177e4 | 2237 | check_irq_on(); |
b28a02de | 2238 | for_each_online_node(node) { |
e498be7d | 2239 | l3 = cachep->nodelists[node]; |
a4523a8b RD |
2240 | if (l3 && l3->alien) |
2241 | drain_alien_cache(cachep, l3->alien); | |
2242 | } | |
2243 | ||
2244 | for_each_online_node(node) { | |
2245 | l3 = cachep->nodelists[node]; | |
2246 | if (l3) | |
aab2207c | 2247 | drain_array(cachep, l3, l3->shared, 1, node); |
e498be7d | 2248 | } |
1da177e4 LT |
2249 | } |
2250 | ||
343e0d7a | 2251 | static int __node_shrink(struct kmem_cache *cachep, int node) |
1da177e4 LT |
2252 | { |
2253 | struct slab *slabp; | |
e498be7d | 2254 | struct kmem_list3 *l3 = cachep->nodelists[node]; |
1da177e4 LT |
2255 | int ret; |
2256 | ||
e498be7d | 2257 | for (;;) { |
1da177e4 LT |
2258 | struct list_head *p; |
2259 | ||
e498be7d CL |
2260 | p = l3->slabs_free.prev; |
2261 | if (p == &l3->slabs_free) | |
1da177e4 LT |
2262 | break; |
2263 | ||
e498be7d | 2264 | slabp = list_entry(l3->slabs_free.prev, struct slab, list); |
1da177e4 | 2265 | #if DEBUG |
40094fa6 | 2266 | BUG_ON(slabp->inuse); |
1da177e4 LT |
2267 | #endif |
2268 | list_del(&slabp->list); | |
2269 | ||
e498be7d CL |
2270 | l3->free_objects -= cachep->num; |
2271 | spin_unlock_irq(&l3->list_lock); | |
1da177e4 | 2272 | slab_destroy(cachep, slabp); |
e498be7d | 2273 | spin_lock_irq(&l3->list_lock); |
1da177e4 | 2274 | } |
b28a02de | 2275 | ret = !list_empty(&l3->slabs_full) || !list_empty(&l3->slabs_partial); |
1da177e4 LT |
2276 | return ret; |
2277 | } | |
2278 | ||
343e0d7a | 2279 | static int __cache_shrink(struct kmem_cache *cachep) |
e498be7d CL |
2280 | { |
2281 | int ret = 0, i = 0; | |
2282 | struct kmem_list3 *l3; | |
2283 | ||
2284 | drain_cpu_caches(cachep); | |
2285 | ||
2286 | check_irq_on(); | |
2287 | for_each_online_node(i) { | |
2288 | l3 = cachep->nodelists[i]; | |
2289 | if (l3) { | |
2290 | spin_lock_irq(&l3->list_lock); | |
2291 | ret += __node_shrink(cachep, i); | |
2292 | spin_unlock_irq(&l3->list_lock); | |
2293 | } | |
2294 | } | |
2295 | return (ret ? 1 : 0); | |
2296 | } | |
2297 | ||
1da177e4 LT |
2298 | /** |
2299 | * kmem_cache_shrink - Shrink a cache. | |
2300 | * @cachep: The cache to shrink. | |
2301 | * | |
2302 | * Releases as many slabs as possible for a cache. | |
2303 | * To help debugging, a zero exit status indicates all slabs were released. | |
2304 | */ | |
343e0d7a | 2305 | int kmem_cache_shrink(struct kmem_cache *cachep) |
1da177e4 | 2306 | { |
40094fa6 | 2307 | BUG_ON(!cachep || in_interrupt()); |
1da177e4 LT |
2308 | |
2309 | return __cache_shrink(cachep); | |
2310 | } | |
2311 | EXPORT_SYMBOL(kmem_cache_shrink); | |
2312 | ||
2313 | /** | |
2314 | * kmem_cache_destroy - delete a cache | |
2315 | * @cachep: the cache to destroy | |
2316 | * | |
343e0d7a | 2317 | * Remove a struct kmem_cache object from the slab cache. |
1da177e4 LT |
2318 | * Returns 0 on success. |
2319 | * | |
2320 | * It is expected this function will be called by a module when it is | |
2321 | * unloaded. This will remove the cache completely, and avoid a duplicate | |
2322 | * cache being allocated each time a module is loaded and unloaded, if the | |
2323 | * module doesn't have persistent in-kernel storage across loads and unloads. | |
2324 | * | |
2325 | * The cache must be empty before calling this function. | |
2326 | * | |
2327 | * The caller must guarantee that noone will allocate memory from the cache | |
2328 | * during the kmem_cache_destroy(). | |
2329 | */ | |
343e0d7a | 2330 | int kmem_cache_destroy(struct kmem_cache *cachep) |
1da177e4 LT |
2331 | { |
2332 | int i; | |
e498be7d | 2333 | struct kmem_list3 *l3; |
1da177e4 | 2334 | |
40094fa6 | 2335 | BUG_ON(!cachep || in_interrupt()); |
1da177e4 LT |
2336 | |
2337 | /* Don't let CPUs to come and go */ | |
2338 | lock_cpu_hotplug(); | |
2339 | ||
2340 | /* Find the cache in the chain of caches. */ | |
fc0abb14 | 2341 | mutex_lock(&cache_chain_mutex); |
1da177e4 LT |
2342 | /* |
2343 | * the chain is never empty, cache_cache is never destroyed | |
2344 | */ | |
2345 | list_del(&cachep->next); | |
fc0abb14 | 2346 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
2347 | |
2348 | if (__cache_shrink(cachep)) { | |
2349 | slab_error(cachep, "Can't free all objects"); | |
fc0abb14 | 2350 | mutex_lock(&cache_chain_mutex); |
b28a02de | 2351 | list_add(&cachep->next, &cache_chain); |
fc0abb14 | 2352 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
2353 | unlock_cpu_hotplug(); |
2354 | return 1; | |
2355 | } | |
2356 | ||
2357 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) | |
fbd568a3 | 2358 | synchronize_rcu(); |
1da177e4 | 2359 | |
e498be7d | 2360 | for_each_online_cpu(i) |
b28a02de | 2361 | kfree(cachep->array[i]); |
1da177e4 LT |
2362 | |
2363 | /* NUMA: free the list3 structures */ | |
e498be7d | 2364 | for_each_online_node(i) { |
a737b3e2 AM |
2365 | l3 = cachep->nodelists[i]; |
2366 | if (l3) { | |
e498be7d CL |
2367 | kfree(l3->shared); |
2368 | free_alien_cache(l3->alien); | |
2369 | kfree(l3); | |
2370 | } | |
2371 | } | |
1da177e4 | 2372 | kmem_cache_free(&cache_cache, cachep); |
1da177e4 | 2373 | unlock_cpu_hotplug(); |
1da177e4 LT |
2374 | return 0; |
2375 | } | |
2376 | EXPORT_SYMBOL(kmem_cache_destroy); | |
2377 | ||
2378 | /* Get the memory for a slab management obj. */ | |
343e0d7a | 2379 | static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp, |
5b74ada7 RT |
2380 | int colour_off, gfp_t local_flags, |
2381 | int nodeid) | |
1da177e4 LT |
2382 | { |
2383 | struct slab *slabp; | |
b28a02de | 2384 | |
1da177e4 LT |
2385 | if (OFF_SLAB(cachep)) { |
2386 | /* Slab management obj is off-slab. */ | |
5b74ada7 RT |
2387 | slabp = kmem_cache_alloc_node(cachep->slabp_cache, |
2388 | local_flags, nodeid); | |
1da177e4 LT |
2389 | if (!slabp) |
2390 | return NULL; | |
2391 | } else { | |
b28a02de | 2392 | slabp = objp + colour_off; |
1da177e4 LT |
2393 | colour_off += cachep->slab_size; |
2394 | } | |
2395 | slabp->inuse = 0; | |
2396 | slabp->colouroff = colour_off; | |
b28a02de | 2397 | slabp->s_mem = objp + colour_off; |
5b74ada7 | 2398 | slabp->nodeid = nodeid; |
1da177e4 LT |
2399 | return slabp; |
2400 | } | |
2401 | ||
2402 | static inline kmem_bufctl_t *slab_bufctl(struct slab *slabp) | |
2403 | { | |
b28a02de | 2404 | return (kmem_bufctl_t *) (slabp + 1); |
1da177e4 LT |
2405 | } |
2406 | ||
343e0d7a | 2407 | static void cache_init_objs(struct kmem_cache *cachep, |
b28a02de | 2408 | struct slab *slabp, unsigned long ctor_flags) |
1da177e4 LT |
2409 | { |
2410 | int i; | |
2411 | ||
2412 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 2413 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
2414 | #if DEBUG |
2415 | /* need to poison the objs? */ | |
2416 | if (cachep->flags & SLAB_POISON) | |
2417 | poison_obj(cachep, objp, POISON_FREE); | |
2418 | if (cachep->flags & SLAB_STORE_USER) | |
2419 | *dbg_userword(cachep, objp) = NULL; | |
2420 | ||
2421 | if (cachep->flags & SLAB_RED_ZONE) { | |
2422 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; | |
2423 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
2424 | } | |
2425 | /* | |
a737b3e2 AM |
2426 | * Constructors are not allowed to allocate memory from the same |
2427 | * cache which they are a constructor for. Otherwise, deadlock. | |
2428 | * They must also be threaded. | |
1da177e4 LT |
2429 | */ |
2430 | if (cachep->ctor && !(cachep->flags & SLAB_POISON)) | |
3dafccf2 | 2431 | cachep->ctor(objp + obj_offset(cachep), cachep, |
b28a02de | 2432 | ctor_flags); |
1da177e4 LT |
2433 | |
2434 | if (cachep->flags & SLAB_RED_ZONE) { | |
2435 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) | |
2436 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2437 | " end of an object"); |
1da177e4 LT |
2438 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) |
2439 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2440 | " start of an object"); |
1da177e4 | 2441 | } |
a737b3e2 AM |
2442 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && |
2443 | OFF_SLAB(cachep) && cachep->flags & SLAB_POISON) | |
b28a02de | 2444 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 2445 | cachep->buffer_size / PAGE_SIZE, 0); |
1da177e4 LT |
2446 | #else |
2447 | if (cachep->ctor) | |
2448 | cachep->ctor(objp, cachep, ctor_flags); | |
2449 | #endif | |
b28a02de | 2450 | slab_bufctl(slabp)[i] = i + 1; |
1da177e4 | 2451 | } |
b28a02de | 2452 | slab_bufctl(slabp)[i - 1] = BUFCTL_END; |
1da177e4 LT |
2453 | slabp->free = 0; |
2454 | } | |
2455 | ||
343e0d7a | 2456 | static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 2457 | { |
a737b3e2 AM |
2458 | if (flags & SLAB_DMA) |
2459 | BUG_ON(!(cachep->gfpflags & GFP_DMA)); | |
2460 | else | |
2461 | BUG_ON(cachep->gfpflags & GFP_DMA); | |
1da177e4 LT |
2462 | } |
2463 | ||
a737b3e2 AM |
2464 | static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, |
2465 | int nodeid) | |
78d382d7 | 2466 | { |
8fea4e96 | 2467 | void *objp = index_to_obj(cachep, slabp, slabp->free); |
78d382d7 MD |
2468 | kmem_bufctl_t next; |
2469 | ||
2470 | slabp->inuse++; | |
2471 | next = slab_bufctl(slabp)[slabp->free]; | |
2472 | #if DEBUG | |
2473 | slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE; | |
2474 | WARN_ON(slabp->nodeid != nodeid); | |
2475 | #endif | |
2476 | slabp->free = next; | |
2477 | ||
2478 | return objp; | |
2479 | } | |
2480 | ||
a737b3e2 AM |
2481 | static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, |
2482 | void *objp, int nodeid) | |
78d382d7 | 2483 | { |
8fea4e96 | 2484 | unsigned int objnr = obj_to_index(cachep, slabp, objp); |
78d382d7 MD |
2485 | |
2486 | #if DEBUG | |
2487 | /* Verify that the slab belongs to the intended node */ | |
2488 | WARN_ON(slabp->nodeid != nodeid); | |
2489 | ||
871751e2 | 2490 | if (slab_bufctl(slabp)[objnr] + 1 <= SLAB_LIMIT + 1) { |
78d382d7 | 2491 | printk(KERN_ERR "slab: double free detected in cache " |
a737b3e2 | 2492 | "'%s', objp %p\n", cachep->name, objp); |
78d382d7 MD |
2493 | BUG(); |
2494 | } | |
2495 | #endif | |
2496 | slab_bufctl(slabp)[objnr] = slabp->free; | |
2497 | slabp->free = objnr; | |
2498 | slabp->inuse--; | |
2499 | } | |
2500 | ||
4776874f PE |
2501 | /* |
2502 | * Map pages beginning at addr to the given cache and slab. This is required | |
2503 | * for the slab allocator to be able to lookup the cache and slab of a | |
2504 | * virtual address for kfree, ksize, kmem_ptr_validate, and slab debugging. | |
2505 | */ | |
2506 | static void slab_map_pages(struct kmem_cache *cache, struct slab *slab, | |
2507 | void *addr) | |
1da177e4 | 2508 | { |
4776874f | 2509 | int nr_pages; |
1da177e4 LT |
2510 | struct page *page; |
2511 | ||
4776874f | 2512 | page = virt_to_page(addr); |
84097518 | 2513 | |
4776874f | 2514 | nr_pages = 1; |
84097518 | 2515 | if (likely(!PageCompound(page))) |
4776874f PE |
2516 | nr_pages <<= cache->gfporder; |
2517 | ||
1da177e4 | 2518 | do { |
4776874f PE |
2519 | page_set_cache(page, cache); |
2520 | page_set_slab(page, slab); | |
1da177e4 | 2521 | page++; |
4776874f | 2522 | } while (--nr_pages); |
1da177e4 LT |
2523 | } |
2524 | ||
2525 | /* | |
2526 | * Grow (by 1) the number of slabs within a cache. This is called by | |
2527 | * kmem_cache_alloc() when there are no active objs left in a cache. | |
2528 | */ | |
343e0d7a | 2529 | static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
1da177e4 | 2530 | { |
b28a02de PE |
2531 | struct slab *slabp; |
2532 | void *objp; | |
2533 | size_t offset; | |
2534 | gfp_t local_flags; | |
2535 | unsigned long ctor_flags; | |
e498be7d | 2536 | struct kmem_list3 *l3; |
1da177e4 | 2537 | |
a737b3e2 AM |
2538 | /* |
2539 | * Be lazy and only check for valid flags here, keeping it out of the | |
2540 | * critical path in kmem_cache_alloc(). | |
1da177e4 | 2541 | */ |
40094fa6 | 2542 | BUG_ON(flags & ~(SLAB_DMA | SLAB_LEVEL_MASK | SLAB_NO_GROW)); |
1da177e4 LT |
2543 | if (flags & SLAB_NO_GROW) |
2544 | return 0; | |
2545 | ||
2546 | ctor_flags = SLAB_CTOR_CONSTRUCTOR; | |
2547 | local_flags = (flags & SLAB_LEVEL_MASK); | |
2548 | if (!(local_flags & __GFP_WAIT)) | |
2549 | /* | |
2550 | * Not allowed to sleep. Need to tell a constructor about | |
2551 | * this - it might need to know... | |
2552 | */ | |
2553 | ctor_flags |= SLAB_CTOR_ATOMIC; | |
2554 | ||
2e1217cf | 2555 | /* Take the l3 list lock to change the colour_next on this node */ |
1da177e4 | 2556 | check_irq_off(); |
2e1217cf RT |
2557 | l3 = cachep->nodelists[nodeid]; |
2558 | spin_lock(&l3->list_lock); | |
1da177e4 LT |
2559 | |
2560 | /* Get colour for the slab, and cal the next value. */ | |
2e1217cf RT |
2561 | offset = l3->colour_next; |
2562 | l3->colour_next++; | |
2563 | if (l3->colour_next >= cachep->colour) | |
2564 | l3->colour_next = 0; | |
2565 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2566 | |
2e1217cf | 2567 | offset *= cachep->colour_off; |
1da177e4 LT |
2568 | |
2569 | if (local_flags & __GFP_WAIT) | |
2570 | local_irq_enable(); | |
2571 | ||
2572 | /* | |
2573 | * The test for missing atomic flag is performed here, rather than | |
2574 | * the more obvious place, simply to reduce the critical path length | |
2575 | * in kmem_cache_alloc(). If a caller is seriously mis-behaving they | |
2576 | * will eventually be caught here (where it matters). | |
2577 | */ | |
2578 | kmem_flagcheck(cachep, flags); | |
2579 | ||
a737b3e2 AM |
2580 | /* |
2581 | * Get mem for the objs. Attempt to allocate a physical page from | |
2582 | * 'nodeid'. | |
e498be7d | 2583 | */ |
a737b3e2 AM |
2584 | objp = kmem_getpages(cachep, flags, nodeid); |
2585 | if (!objp) | |
1da177e4 LT |
2586 | goto failed; |
2587 | ||
2588 | /* Get slab management. */ | |
5b74ada7 | 2589 | slabp = alloc_slabmgmt(cachep, objp, offset, local_flags, nodeid); |
a737b3e2 | 2590 | if (!slabp) |
1da177e4 LT |
2591 | goto opps1; |
2592 | ||
e498be7d | 2593 | slabp->nodeid = nodeid; |
4776874f | 2594 | slab_map_pages(cachep, slabp, objp); |
1da177e4 LT |
2595 | |
2596 | cache_init_objs(cachep, slabp, ctor_flags); | |
2597 | ||
2598 | if (local_flags & __GFP_WAIT) | |
2599 | local_irq_disable(); | |
2600 | check_irq_off(); | |
e498be7d | 2601 | spin_lock(&l3->list_lock); |
1da177e4 LT |
2602 | |
2603 | /* Make slab active. */ | |
e498be7d | 2604 | list_add_tail(&slabp->list, &(l3->slabs_free)); |
1da177e4 | 2605 | STATS_INC_GROWN(cachep); |
e498be7d CL |
2606 | l3->free_objects += cachep->num; |
2607 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2608 | return 1; |
a737b3e2 | 2609 | opps1: |
1da177e4 | 2610 | kmem_freepages(cachep, objp); |
a737b3e2 | 2611 | failed: |
1da177e4 LT |
2612 | if (local_flags & __GFP_WAIT) |
2613 | local_irq_disable(); | |
2614 | return 0; | |
2615 | } | |
2616 | ||
2617 | #if DEBUG | |
2618 | ||
2619 | /* | |
2620 | * Perform extra freeing checks: | |
2621 | * - detect bad pointers. | |
2622 | * - POISON/RED_ZONE checking | |
2623 | * - destructor calls, for caches with POISON+dtor | |
2624 | */ | |
2625 | static void kfree_debugcheck(const void *objp) | |
2626 | { | |
2627 | struct page *page; | |
2628 | ||
2629 | if (!virt_addr_valid(objp)) { | |
2630 | printk(KERN_ERR "kfree_debugcheck: out of range ptr %lxh.\n", | |
b28a02de PE |
2631 | (unsigned long)objp); |
2632 | BUG(); | |
1da177e4 LT |
2633 | } |
2634 | page = virt_to_page(objp); | |
2635 | if (!PageSlab(page)) { | |
b28a02de PE |
2636 | printk(KERN_ERR "kfree_debugcheck: bad ptr %lxh.\n", |
2637 | (unsigned long)objp); | |
1da177e4 LT |
2638 | BUG(); |
2639 | } | |
2640 | } | |
2641 | ||
58ce1fd5 PE |
2642 | static inline void verify_redzone_free(struct kmem_cache *cache, void *obj) |
2643 | { | |
2644 | unsigned long redzone1, redzone2; | |
2645 | ||
2646 | redzone1 = *dbg_redzone1(cache, obj); | |
2647 | redzone2 = *dbg_redzone2(cache, obj); | |
2648 | ||
2649 | /* | |
2650 | * Redzone is ok. | |
2651 | */ | |
2652 | if (redzone1 == RED_ACTIVE && redzone2 == RED_ACTIVE) | |
2653 | return; | |
2654 | ||
2655 | if (redzone1 == RED_INACTIVE && redzone2 == RED_INACTIVE) | |
2656 | slab_error(cache, "double free detected"); | |
2657 | else | |
2658 | slab_error(cache, "memory outside object was overwritten"); | |
2659 | ||
2660 | printk(KERN_ERR "%p: redzone 1:0x%lx, redzone 2:0x%lx.\n", | |
2661 | obj, redzone1, redzone2); | |
2662 | } | |
2663 | ||
343e0d7a | 2664 | static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, |
b28a02de | 2665 | void *caller) |
1da177e4 LT |
2666 | { |
2667 | struct page *page; | |
2668 | unsigned int objnr; | |
2669 | struct slab *slabp; | |
2670 | ||
3dafccf2 | 2671 | objp -= obj_offset(cachep); |
1da177e4 LT |
2672 | kfree_debugcheck(objp); |
2673 | page = virt_to_page(objp); | |
2674 | ||
065d41cb | 2675 | slabp = page_get_slab(page); |
1da177e4 LT |
2676 | |
2677 | if (cachep->flags & SLAB_RED_ZONE) { | |
58ce1fd5 | 2678 | verify_redzone_free(cachep, objp); |
1da177e4 LT |
2679 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; |
2680 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
2681 | } | |
2682 | if (cachep->flags & SLAB_STORE_USER) | |
2683 | *dbg_userword(cachep, objp) = caller; | |
2684 | ||
8fea4e96 | 2685 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 LT |
2686 | |
2687 | BUG_ON(objnr >= cachep->num); | |
8fea4e96 | 2688 | BUG_ON(objp != index_to_obj(cachep, slabp, objnr)); |
1da177e4 LT |
2689 | |
2690 | if (cachep->flags & SLAB_DEBUG_INITIAL) { | |
a737b3e2 AM |
2691 | /* |
2692 | * Need to call the slab's constructor so the caller can | |
2693 | * perform a verify of its state (debugging). Called without | |
2694 | * the cache-lock held. | |
1da177e4 | 2695 | */ |
3dafccf2 | 2696 | cachep->ctor(objp + obj_offset(cachep), |
b28a02de | 2697 | cachep, SLAB_CTOR_CONSTRUCTOR | SLAB_CTOR_VERIFY); |
1da177e4 LT |
2698 | } |
2699 | if (cachep->flags & SLAB_POISON && cachep->dtor) { | |
2700 | /* we want to cache poison the object, | |
2701 | * call the destruction callback | |
2702 | */ | |
3dafccf2 | 2703 | cachep->dtor(objp + obj_offset(cachep), cachep, 0); |
1da177e4 | 2704 | } |
871751e2 AV |
2705 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
2706 | slab_bufctl(slabp)[objnr] = BUFCTL_FREE; | |
2707 | #endif | |
1da177e4 LT |
2708 | if (cachep->flags & SLAB_POISON) { |
2709 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
a737b3e2 | 2710 | if ((cachep->buffer_size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) { |
1da177e4 | 2711 | store_stackinfo(cachep, objp, (unsigned long)caller); |
b28a02de | 2712 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 2713 | cachep->buffer_size / PAGE_SIZE, 0); |
1da177e4 LT |
2714 | } else { |
2715 | poison_obj(cachep, objp, POISON_FREE); | |
2716 | } | |
2717 | #else | |
2718 | poison_obj(cachep, objp, POISON_FREE); | |
2719 | #endif | |
2720 | } | |
2721 | return objp; | |
2722 | } | |
2723 | ||
343e0d7a | 2724 | static void check_slabp(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 LT |
2725 | { |
2726 | kmem_bufctl_t i; | |
2727 | int entries = 0; | |
b28a02de | 2728 | |
1da177e4 LT |
2729 | /* Check slab's freelist to see if this obj is there. */ |
2730 | for (i = slabp->free; i != BUFCTL_END; i = slab_bufctl(slabp)[i]) { | |
2731 | entries++; | |
2732 | if (entries > cachep->num || i >= cachep->num) | |
2733 | goto bad; | |
2734 | } | |
2735 | if (entries != cachep->num - slabp->inuse) { | |
a737b3e2 AM |
2736 | bad: |
2737 | printk(KERN_ERR "slab: Internal list corruption detected in " | |
2738 | "cache '%s'(%d), slabp %p(%d). Hexdump:\n", | |
2739 | cachep->name, cachep->num, slabp, slabp->inuse); | |
b28a02de | 2740 | for (i = 0; |
264132bc | 2741 | i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t); |
b28a02de | 2742 | i++) { |
a737b3e2 | 2743 | if (i % 16 == 0) |
1da177e4 | 2744 | printk("\n%03x:", i); |
b28a02de | 2745 | printk(" %02x", ((unsigned char *)slabp)[i]); |
1da177e4 LT |
2746 | } |
2747 | printk("\n"); | |
2748 | BUG(); | |
2749 | } | |
2750 | } | |
2751 | #else | |
2752 | #define kfree_debugcheck(x) do { } while(0) | |
2753 | #define cache_free_debugcheck(x,objp,z) (objp) | |
2754 | #define check_slabp(x,y) do { } while(0) | |
2755 | #endif | |
2756 | ||
343e0d7a | 2757 | static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 LT |
2758 | { |
2759 | int batchcount; | |
2760 | struct kmem_list3 *l3; | |
2761 | struct array_cache *ac; | |
2762 | ||
2763 | check_irq_off(); | |
9a2dba4b | 2764 | ac = cpu_cache_get(cachep); |
a737b3e2 | 2765 | retry: |
1da177e4 LT |
2766 | batchcount = ac->batchcount; |
2767 | if (!ac->touched && batchcount > BATCHREFILL_LIMIT) { | |
a737b3e2 AM |
2768 | /* |
2769 | * If there was little recent activity on this cache, then | |
2770 | * perform only a partial refill. Otherwise we could generate | |
2771 | * refill bouncing. | |
1da177e4 LT |
2772 | */ |
2773 | batchcount = BATCHREFILL_LIMIT; | |
2774 | } | |
e498be7d CL |
2775 | l3 = cachep->nodelists[numa_node_id()]; |
2776 | ||
2777 | BUG_ON(ac->avail > 0 || !l3); | |
2778 | spin_lock(&l3->list_lock); | |
1da177e4 | 2779 | |
3ded175a CL |
2780 | /* See if we can refill from the shared array */ |
2781 | if (l3->shared && transfer_objects(ac, l3->shared, batchcount)) | |
2782 | goto alloc_done; | |
2783 | ||
1da177e4 LT |
2784 | while (batchcount > 0) { |
2785 | struct list_head *entry; | |
2786 | struct slab *slabp; | |
2787 | /* Get slab alloc is to come from. */ | |
2788 | entry = l3->slabs_partial.next; | |
2789 | if (entry == &l3->slabs_partial) { | |
2790 | l3->free_touched = 1; | |
2791 | entry = l3->slabs_free.next; | |
2792 | if (entry == &l3->slabs_free) | |
2793 | goto must_grow; | |
2794 | } | |
2795 | ||
2796 | slabp = list_entry(entry, struct slab, list); | |
2797 | check_slabp(cachep, slabp); | |
2798 | check_spinlock_acquired(cachep); | |
2799 | while (slabp->inuse < cachep->num && batchcount--) { | |
1da177e4 LT |
2800 | STATS_INC_ALLOCED(cachep); |
2801 | STATS_INC_ACTIVE(cachep); | |
2802 | STATS_SET_HIGH(cachep); | |
2803 | ||
78d382d7 MD |
2804 | ac->entry[ac->avail++] = slab_get_obj(cachep, slabp, |
2805 | numa_node_id()); | |
1da177e4 LT |
2806 | } |
2807 | check_slabp(cachep, slabp); | |
2808 | ||
2809 | /* move slabp to correct slabp list: */ | |
2810 | list_del(&slabp->list); | |
2811 | if (slabp->free == BUFCTL_END) | |
2812 | list_add(&slabp->list, &l3->slabs_full); | |
2813 | else | |
2814 | list_add(&slabp->list, &l3->slabs_partial); | |
2815 | } | |
2816 | ||
a737b3e2 | 2817 | must_grow: |
1da177e4 | 2818 | l3->free_objects -= ac->avail; |
a737b3e2 | 2819 | alloc_done: |
e498be7d | 2820 | spin_unlock(&l3->list_lock); |
1da177e4 LT |
2821 | |
2822 | if (unlikely(!ac->avail)) { | |
2823 | int x; | |
e498be7d CL |
2824 | x = cache_grow(cachep, flags, numa_node_id()); |
2825 | ||
a737b3e2 | 2826 | /* cache_grow can reenable interrupts, then ac could change. */ |
9a2dba4b | 2827 | ac = cpu_cache_get(cachep); |
a737b3e2 | 2828 | if (!x && ac->avail == 0) /* no objects in sight? abort */ |
1da177e4 LT |
2829 | return NULL; |
2830 | ||
a737b3e2 | 2831 | if (!ac->avail) /* objects refilled by interrupt? */ |
1da177e4 LT |
2832 | goto retry; |
2833 | } | |
2834 | ac->touched = 1; | |
e498be7d | 2835 | return ac->entry[--ac->avail]; |
1da177e4 LT |
2836 | } |
2837 | ||
a737b3e2 AM |
2838 | static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep, |
2839 | gfp_t flags) | |
1da177e4 LT |
2840 | { |
2841 | might_sleep_if(flags & __GFP_WAIT); | |
2842 | #if DEBUG | |
2843 | kmem_flagcheck(cachep, flags); | |
2844 | #endif | |
2845 | } | |
2846 | ||
2847 | #if DEBUG | |
a737b3e2 AM |
2848 | static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, |
2849 | gfp_t flags, void *objp, void *caller) | |
1da177e4 | 2850 | { |
b28a02de | 2851 | if (!objp) |
1da177e4 | 2852 | return objp; |
b28a02de | 2853 | if (cachep->flags & SLAB_POISON) { |
1da177e4 | 2854 | #ifdef CONFIG_DEBUG_PAGEALLOC |
3dafccf2 | 2855 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) |
b28a02de | 2856 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 2857 | cachep->buffer_size / PAGE_SIZE, 1); |
1da177e4 LT |
2858 | else |
2859 | check_poison_obj(cachep, objp); | |
2860 | #else | |
2861 | check_poison_obj(cachep, objp); | |
2862 | #endif | |
2863 | poison_obj(cachep, objp, POISON_INUSE); | |
2864 | } | |
2865 | if (cachep->flags & SLAB_STORE_USER) | |
2866 | *dbg_userword(cachep, objp) = caller; | |
2867 | ||
2868 | if (cachep->flags & SLAB_RED_ZONE) { | |
a737b3e2 AM |
2869 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE || |
2870 | *dbg_redzone2(cachep, objp) != RED_INACTIVE) { | |
2871 | slab_error(cachep, "double free, or memory outside" | |
2872 | " object was overwritten"); | |
b28a02de | 2873 | printk(KERN_ERR |
a737b3e2 AM |
2874 | "%p: redzone 1:0x%lx, redzone 2:0x%lx\n", |
2875 | objp, *dbg_redzone1(cachep, objp), | |
2876 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
2877 | } |
2878 | *dbg_redzone1(cachep, objp) = RED_ACTIVE; | |
2879 | *dbg_redzone2(cachep, objp) = RED_ACTIVE; | |
2880 | } | |
871751e2 AV |
2881 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
2882 | { | |
2883 | struct slab *slabp; | |
2884 | unsigned objnr; | |
2885 | ||
2886 | slabp = page_get_slab(virt_to_page(objp)); | |
2887 | objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size; | |
2888 | slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE; | |
2889 | } | |
2890 | #endif | |
3dafccf2 | 2891 | objp += obj_offset(cachep); |
1da177e4 | 2892 | if (cachep->ctor && cachep->flags & SLAB_POISON) { |
b28a02de | 2893 | unsigned long ctor_flags = SLAB_CTOR_CONSTRUCTOR; |
1da177e4 LT |
2894 | |
2895 | if (!(flags & __GFP_WAIT)) | |
2896 | ctor_flags |= SLAB_CTOR_ATOMIC; | |
2897 | ||
2898 | cachep->ctor(objp, cachep, ctor_flags); | |
b28a02de | 2899 | } |
1da177e4 LT |
2900 | return objp; |
2901 | } | |
2902 | #else | |
2903 | #define cache_alloc_debugcheck_after(a,b,objp,d) (objp) | |
2904 | #endif | |
2905 | ||
343e0d7a | 2906 | static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 2907 | { |
b28a02de | 2908 | void *objp; |
1da177e4 LT |
2909 | struct array_cache *ac; |
2910 | ||
dc85da15 | 2911 | #ifdef CONFIG_NUMA |
b2455396 | 2912 | if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { |
c61afb18 PJ |
2913 | objp = alternate_node_alloc(cachep, flags); |
2914 | if (objp != NULL) | |
2915 | return objp; | |
dc85da15 CL |
2916 | } |
2917 | #endif | |
2918 | ||
5c382300 | 2919 | check_irq_off(); |
9a2dba4b | 2920 | ac = cpu_cache_get(cachep); |
1da177e4 LT |
2921 | if (likely(ac->avail)) { |
2922 | STATS_INC_ALLOCHIT(cachep); | |
2923 | ac->touched = 1; | |
e498be7d | 2924 | objp = ac->entry[--ac->avail]; |
1da177e4 LT |
2925 | } else { |
2926 | STATS_INC_ALLOCMISS(cachep); | |
2927 | objp = cache_alloc_refill(cachep, flags); | |
2928 | } | |
5c382300 AK |
2929 | return objp; |
2930 | } | |
2931 | ||
a737b3e2 AM |
2932 | static __always_inline void *__cache_alloc(struct kmem_cache *cachep, |
2933 | gfp_t flags, void *caller) | |
5c382300 AK |
2934 | { |
2935 | unsigned long save_flags; | |
b28a02de | 2936 | void *objp; |
5c382300 AK |
2937 | |
2938 | cache_alloc_debugcheck_before(cachep, flags); | |
2939 | ||
2940 | local_irq_save(save_flags); | |
2941 | objp = ____cache_alloc(cachep, flags); | |
1da177e4 | 2942 | local_irq_restore(save_flags); |
34342e86 | 2943 | objp = cache_alloc_debugcheck_after(cachep, flags, objp, |
7fd6b141 | 2944 | caller); |
34342e86 | 2945 | prefetchw(objp); |
1da177e4 LT |
2946 | return objp; |
2947 | } | |
2948 | ||
e498be7d | 2949 | #ifdef CONFIG_NUMA |
c61afb18 | 2950 | /* |
b2455396 | 2951 | * Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY. |
c61afb18 PJ |
2952 | * |
2953 | * If we are in_interrupt, then process context, including cpusets and | |
2954 | * mempolicy, may not apply and should not be used for allocation policy. | |
2955 | */ | |
2956 | static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) | |
2957 | { | |
2958 | int nid_alloc, nid_here; | |
2959 | ||
2960 | if (in_interrupt()) | |
2961 | return NULL; | |
2962 | nid_alloc = nid_here = numa_node_id(); | |
2963 | if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD)) | |
2964 | nid_alloc = cpuset_mem_spread_node(); | |
2965 | else if (current->mempolicy) | |
2966 | nid_alloc = slab_node(current->mempolicy); | |
2967 | if (nid_alloc != nid_here) | |
2968 | return __cache_alloc_node(cachep, flags, nid_alloc); | |
2969 | return NULL; | |
2970 | } | |
2971 | ||
e498be7d CL |
2972 | /* |
2973 | * A interface to enable slab creation on nodeid | |
1da177e4 | 2974 | */ |
a737b3e2 AM |
2975 | static void *__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, |
2976 | int nodeid) | |
e498be7d CL |
2977 | { |
2978 | struct list_head *entry; | |
b28a02de PE |
2979 | struct slab *slabp; |
2980 | struct kmem_list3 *l3; | |
2981 | void *obj; | |
b28a02de PE |
2982 | int x; |
2983 | ||
2984 | l3 = cachep->nodelists[nodeid]; | |
2985 | BUG_ON(!l3); | |
2986 | ||
a737b3e2 | 2987 | retry: |
ca3b9b91 | 2988 | check_irq_off(); |
b28a02de PE |
2989 | spin_lock(&l3->list_lock); |
2990 | entry = l3->slabs_partial.next; | |
2991 | if (entry == &l3->slabs_partial) { | |
2992 | l3->free_touched = 1; | |
2993 | entry = l3->slabs_free.next; | |
2994 | if (entry == &l3->slabs_free) | |
2995 | goto must_grow; | |
2996 | } | |
2997 | ||
2998 | slabp = list_entry(entry, struct slab, list); | |
2999 | check_spinlock_acquired_node(cachep, nodeid); | |
3000 | check_slabp(cachep, slabp); | |
3001 | ||
3002 | STATS_INC_NODEALLOCS(cachep); | |
3003 | STATS_INC_ACTIVE(cachep); | |
3004 | STATS_SET_HIGH(cachep); | |
3005 | ||
3006 | BUG_ON(slabp->inuse == cachep->num); | |
3007 | ||
78d382d7 | 3008 | obj = slab_get_obj(cachep, slabp, nodeid); |
b28a02de PE |
3009 | check_slabp(cachep, slabp); |
3010 | l3->free_objects--; | |
3011 | /* move slabp to correct slabp list: */ | |
3012 | list_del(&slabp->list); | |
3013 | ||
a737b3e2 | 3014 | if (slabp->free == BUFCTL_END) |
b28a02de | 3015 | list_add(&slabp->list, &l3->slabs_full); |
a737b3e2 | 3016 | else |
b28a02de | 3017 | list_add(&slabp->list, &l3->slabs_partial); |
e498be7d | 3018 | |
b28a02de PE |
3019 | spin_unlock(&l3->list_lock); |
3020 | goto done; | |
e498be7d | 3021 | |
a737b3e2 | 3022 | must_grow: |
b28a02de PE |
3023 | spin_unlock(&l3->list_lock); |
3024 | x = cache_grow(cachep, flags, nodeid); | |
1da177e4 | 3025 | |
b28a02de PE |
3026 | if (!x) |
3027 | return NULL; | |
e498be7d | 3028 | |
b28a02de | 3029 | goto retry; |
a737b3e2 | 3030 | done: |
b28a02de | 3031 | return obj; |
e498be7d CL |
3032 | } |
3033 | #endif | |
3034 | ||
3035 | /* | |
3036 | * Caller needs to acquire correct kmem_list's list_lock | |
3037 | */ | |
343e0d7a | 3038 | static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, |
b28a02de | 3039 | int node) |
1da177e4 LT |
3040 | { |
3041 | int i; | |
e498be7d | 3042 | struct kmem_list3 *l3; |
1da177e4 LT |
3043 | |
3044 | for (i = 0; i < nr_objects; i++) { | |
3045 | void *objp = objpp[i]; | |
3046 | struct slab *slabp; | |
1da177e4 | 3047 | |
6ed5eb22 | 3048 | slabp = virt_to_slab(objp); |
ff69416e | 3049 | l3 = cachep->nodelists[node]; |
1da177e4 | 3050 | list_del(&slabp->list); |
ff69416e | 3051 | check_spinlock_acquired_node(cachep, node); |
1da177e4 | 3052 | check_slabp(cachep, slabp); |
78d382d7 | 3053 | slab_put_obj(cachep, slabp, objp, node); |
1da177e4 | 3054 | STATS_DEC_ACTIVE(cachep); |
e498be7d | 3055 | l3->free_objects++; |
1da177e4 LT |
3056 | check_slabp(cachep, slabp); |
3057 | ||
3058 | /* fixup slab chains */ | |
3059 | if (slabp->inuse == 0) { | |
e498be7d CL |
3060 | if (l3->free_objects > l3->free_limit) { |
3061 | l3->free_objects -= cachep->num; | |
1da177e4 LT |
3062 | slab_destroy(cachep, slabp); |
3063 | } else { | |
e498be7d | 3064 | list_add(&slabp->list, &l3->slabs_free); |
1da177e4 LT |
3065 | } |
3066 | } else { | |
3067 | /* Unconditionally move a slab to the end of the | |
3068 | * partial list on free - maximum time for the | |
3069 | * other objects to be freed, too. | |
3070 | */ | |
e498be7d | 3071 | list_add_tail(&slabp->list, &l3->slabs_partial); |
1da177e4 LT |
3072 | } |
3073 | } | |
3074 | } | |
3075 | ||
343e0d7a | 3076 | static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) |
1da177e4 LT |
3077 | { |
3078 | int batchcount; | |
e498be7d | 3079 | struct kmem_list3 *l3; |
ff69416e | 3080 | int node = numa_node_id(); |
1da177e4 LT |
3081 | |
3082 | batchcount = ac->batchcount; | |
3083 | #if DEBUG | |
3084 | BUG_ON(!batchcount || batchcount > ac->avail); | |
3085 | #endif | |
3086 | check_irq_off(); | |
ff69416e | 3087 | l3 = cachep->nodelists[node]; |
e498be7d CL |
3088 | spin_lock(&l3->list_lock); |
3089 | if (l3->shared) { | |
3090 | struct array_cache *shared_array = l3->shared; | |
b28a02de | 3091 | int max = shared_array->limit - shared_array->avail; |
1da177e4 LT |
3092 | if (max) { |
3093 | if (batchcount > max) | |
3094 | batchcount = max; | |
e498be7d | 3095 | memcpy(&(shared_array->entry[shared_array->avail]), |
b28a02de | 3096 | ac->entry, sizeof(void *) * batchcount); |
1da177e4 LT |
3097 | shared_array->avail += batchcount; |
3098 | goto free_done; | |
3099 | } | |
3100 | } | |
3101 | ||
ff69416e | 3102 | free_block(cachep, ac->entry, batchcount, node); |
a737b3e2 | 3103 | free_done: |
1da177e4 LT |
3104 | #if STATS |
3105 | { | |
3106 | int i = 0; | |
3107 | struct list_head *p; | |
3108 | ||
e498be7d CL |
3109 | p = l3->slabs_free.next; |
3110 | while (p != &(l3->slabs_free)) { | |
1da177e4 LT |
3111 | struct slab *slabp; |
3112 | ||
3113 | slabp = list_entry(p, struct slab, list); | |
3114 | BUG_ON(slabp->inuse); | |
3115 | ||
3116 | i++; | |
3117 | p = p->next; | |
3118 | } | |
3119 | STATS_SET_FREEABLE(cachep, i); | |
3120 | } | |
3121 | #endif | |
e498be7d | 3122 | spin_unlock(&l3->list_lock); |
1da177e4 | 3123 | ac->avail -= batchcount; |
a737b3e2 | 3124 | memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail); |
1da177e4 LT |
3125 | } |
3126 | ||
3127 | /* | |
a737b3e2 AM |
3128 | * Release an obj back to its cache. If the obj has a constructed state, it must |
3129 | * be in this state _before_ it is released. Called with disabled ints. | |
1da177e4 | 3130 | */ |
343e0d7a | 3131 | static inline void __cache_free(struct kmem_cache *cachep, void *objp) |
1da177e4 | 3132 | { |
9a2dba4b | 3133 | struct array_cache *ac = cpu_cache_get(cachep); |
1da177e4 LT |
3134 | |
3135 | check_irq_off(); | |
3136 | objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0)); | |
3137 | ||
729bd0b7 PE |
3138 | if (cache_free_alien(cachep, objp)) |
3139 | return; | |
3140 | ||
1da177e4 LT |
3141 | if (likely(ac->avail < ac->limit)) { |
3142 | STATS_INC_FREEHIT(cachep); | |
e498be7d | 3143 | ac->entry[ac->avail++] = objp; |
1da177e4 LT |
3144 | return; |
3145 | } else { | |
3146 | STATS_INC_FREEMISS(cachep); | |
3147 | cache_flusharray(cachep, ac); | |
e498be7d | 3148 | ac->entry[ac->avail++] = objp; |
1da177e4 LT |
3149 | } |
3150 | } | |
3151 | ||
3152 | /** | |
3153 | * kmem_cache_alloc - Allocate an object | |
3154 | * @cachep: The cache to allocate from. | |
3155 | * @flags: See kmalloc(). | |
3156 | * | |
3157 | * Allocate an object from this cache. The flags are only relevant | |
3158 | * if the cache has no available objects. | |
3159 | */ | |
343e0d7a | 3160 | void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 3161 | { |
7fd6b141 | 3162 | return __cache_alloc(cachep, flags, __builtin_return_address(0)); |
1da177e4 LT |
3163 | } |
3164 | EXPORT_SYMBOL(kmem_cache_alloc); | |
3165 | ||
a8c0f9a4 PE |
3166 | /** |
3167 | * kmem_cache_alloc - Allocate an object. The memory is set to zero. | |
3168 | * @cache: The cache to allocate from. | |
3169 | * @flags: See kmalloc(). | |
3170 | * | |
3171 | * Allocate an object from this cache and set the allocated memory to zero. | |
3172 | * The flags are only relevant if the cache has no available objects. | |
3173 | */ | |
3174 | void *kmem_cache_zalloc(struct kmem_cache *cache, gfp_t flags) | |
3175 | { | |
3176 | void *ret = __cache_alloc(cache, flags, __builtin_return_address(0)); | |
3177 | if (ret) | |
3178 | memset(ret, 0, obj_size(cache)); | |
3179 | return ret; | |
3180 | } | |
3181 | EXPORT_SYMBOL(kmem_cache_zalloc); | |
3182 | ||
1da177e4 LT |
3183 | /** |
3184 | * kmem_ptr_validate - check if an untrusted pointer might | |
3185 | * be a slab entry. | |
3186 | * @cachep: the cache we're checking against | |
3187 | * @ptr: pointer to validate | |
3188 | * | |
3189 | * This verifies that the untrusted pointer looks sane: | |
3190 | * it is _not_ a guarantee that the pointer is actually | |
3191 | * part of the slab cache in question, but it at least | |
3192 | * validates that the pointer can be dereferenced and | |
3193 | * looks half-way sane. | |
3194 | * | |
3195 | * Currently only used for dentry validation. | |
3196 | */ | |
343e0d7a | 3197 | int fastcall kmem_ptr_validate(struct kmem_cache *cachep, void *ptr) |
1da177e4 | 3198 | { |
b28a02de | 3199 | unsigned long addr = (unsigned long)ptr; |
1da177e4 | 3200 | unsigned long min_addr = PAGE_OFFSET; |
b28a02de | 3201 | unsigned long align_mask = BYTES_PER_WORD - 1; |
3dafccf2 | 3202 | unsigned long size = cachep->buffer_size; |
1da177e4 LT |
3203 | struct page *page; |
3204 | ||
3205 | if (unlikely(addr < min_addr)) | |
3206 | goto out; | |
3207 | if (unlikely(addr > (unsigned long)high_memory - size)) | |
3208 | goto out; | |
3209 | if (unlikely(addr & align_mask)) | |
3210 | goto out; | |
3211 | if (unlikely(!kern_addr_valid(addr))) | |
3212 | goto out; | |
3213 | if (unlikely(!kern_addr_valid(addr + size - 1))) | |
3214 | goto out; | |
3215 | page = virt_to_page(ptr); | |
3216 | if (unlikely(!PageSlab(page))) | |
3217 | goto out; | |
065d41cb | 3218 | if (unlikely(page_get_cache(page) != cachep)) |
1da177e4 LT |
3219 | goto out; |
3220 | return 1; | |
a737b3e2 | 3221 | out: |
1da177e4 LT |
3222 | return 0; |
3223 | } | |
3224 | ||
3225 | #ifdef CONFIG_NUMA | |
3226 | /** | |
3227 | * kmem_cache_alloc_node - Allocate an object on the specified node | |
3228 | * @cachep: The cache to allocate from. | |
3229 | * @flags: See kmalloc(). | |
3230 | * @nodeid: node number of the target node. | |
3231 | * | |
3232 | * Identical to kmem_cache_alloc, except that this function is slow | |
3233 | * and can sleep. And it will allocate memory on the given node, which | |
3234 | * can improve the performance for cpu bound structures. | |
e498be7d CL |
3235 | * New and improved: it will now make sure that the object gets |
3236 | * put on the correct node list so that there is no false sharing. | |
1da177e4 | 3237 | */ |
343e0d7a | 3238 | void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
1da177e4 | 3239 | { |
e498be7d CL |
3240 | unsigned long save_flags; |
3241 | void *ptr; | |
1da177e4 | 3242 | |
e498be7d CL |
3243 | cache_alloc_debugcheck_before(cachep, flags); |
3244 | local_irq_save(save_flags); | |
18f820f6 CL |
3245 | |
3246 | if (nodeid == -1 || nodeid == numa_node_id() || | |
a737b3e2 | 3247 | !cachep->nodelists[nodeid]) |
5c382300 AK |
3248 | ptr = ____cache_alloc(cachep, flags); |
3249 | else | |
3250 | ptr = __cache_alloc_node(cachep, flags, nodeid); | |
e498be7d | 3251 | local_irq_restore(save_flags); |
18f820f6 CL |
3252 | |
3253 | ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, | |
3254 | __builtin_return_address(0)); | |
1da177e4 | 3255 | |
e498be7d | 3256 | return ptr; |
1da177e4 LT |
3257 | } |
3258 | EXPORT_SYMBOL(kmem_cache_alloc_node); | |
3259 | ||
dd0fc66f | 3260 | void *kmalloc_node(size_t size, gfp_t flags, int node) |
97e2bde4 | 3261 | { |
343e0d7a | 3262 | struct kmem_cache *cachep; |
97e2bde4 MS |
3263 | |
3264 | cachep = kmem_find_general_cachep(size, flags); | |
3265 | if (unlikely(cachep == NULL)) | |
3266 | return NULL; | |
3267 | return kmem_cache_alloc_node(cachep, flags, node); | |
3268 | } | |
3269 | EXPORT_SYMBOL(kmalloc_node); | |
1da177e4 LT |
3270 | #endif |
3271 | ||
3272 | /** | |
800590f5 | 3273 | * __do_kmalloc - allocate memory |
1da177e4 | 3274 | * @size: how many bytes of memory are required. |
800590f5 | 3275 | * @flags: the type of memory to allocate (see kmalloc). |
911851e6 | 3276 | * @caller: function caller for debug tracking of the caller |
1da177e4 | 3277 | */ |
7fd6b141 PE |
3278 | static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, |
3279 | void *caller) | |
1da177e4 | 3280 | { |
343e0d7a | 3281 | struct kmem_cache *cachep; |
1da177e4 | 3282 | |
97e2bde4 MS |
3283 | /* If you want to save a few bytes .text space: replace |
3284 | * __ with kmem_. | |
3285 | * Then kmalloc uses the uninlined functions instead of the inline | |
3286 | * functions. | |
3287 | */ | |
3288 | cachep = __find_general_cachep(size, flags); | |
dbdb9045 AM |
3289 | if (unlikely(cachep == NULL)) |
3290 | return NULL; | |
7fd6b141 PE |
3291 | return __cache_alloc(cachep, flags, caller); |
3292 | } | |
3293 | ||
7fd6b141 PE |
3294 | |
3295 | void *__kmalloc(size_t size, gfp_t flags) | |
3296 | { | |
871751e2 | 3297 | #ifndef CONFIG_DEBUG_SLAB |
7fd6b141 | 3298 | return __do_kmalloc(size, flags, NULL); |
871751e2 AV |
3299 | #else |
3300 | return __do_kmalloc(size, flags, __builtin_return_address(0)); | |
3301 | #endif | |
1da177e4 LT |
3302 | } |
3303 | EXPORT_SYMBOL(__kmalloc); | |
3304 | ||
871751e2 | 3305 | #ifdef CONFIG_DEBUG_SLAB |
7fd6b141 PE |
3306 | void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller) |
3307 | { | |
3308 | return __do_kmalloc(size, flags, caller); | |
3309 | } | |
3310 | EXPORT_SYMBOL(__kmalloc_track_caller); | |
7fd6b141 PE |
3311 | #endif |
3312 | ||
1da177e4 LT |
3313 | #ifdef CONFIG_SMP |
3314 | /** | |
3315 | * __alloc_percpu - allocate one copy of the object for every present | |
3316 | * cpu in the system, zeroing them. | |
3317 | * Objects should be dereferenced using the per_cpu_ptr macro only. | |
3318 | * | |
3319 | * @size: how many bytes of memory are required. | |
1da177e4 | 3320 | */ |
f9f75005 | 3321 | void *__alloc_percpu(size_t size) |
1da177e4 LT |
3322 | { |
3323 | int i; | |
b28a02de | 3324 | struct percpu_data *pdata = kmalloc(sizeof(*pdata), GFP_KERNEL); |
1da177e4 LT |
3325 | |
3326 | if (!pdata) | |
3327 | return NULL; | |
3328 | ||
e498be7d CL |
3329 | /* |
3330 | * Cannot use for_each_online_cpu since a cpu may come online | |
3331 | * and we have no way of figuring out how to fix the array | |
3332 | * that we have allocated then.... | |
3333 | */ | |
0a945022 | 3334 | for_each_possible_cpu(i) { |
e498be7d CL |
3335 | int node = cpu_to_node(i); |
3336 | ||
3337 | if (node_online(node)) | |
3338 | pdata->ptrs[i] = kmalloc_node(size, GFP_KERNEL, node); | |
3339 | else | |
3340 | pdata->ptrs[i] = kmalloc(size, GFP_KERNEL); | |
1da177e4 LT |
3341 | |
3342 | if (!pdata->ptrs[i]) | |
3343 | goto unwind_oom; | |
3344 | memset(pdata->ptrs[i], 0, size); | |
3345 | } | |
3346 | ||
3347 | /* Catch derefs w/o wrappers */ | |
b28a02de | 3348 | return (void *)(~(unsigned long)pdata); |
1da177e4 | 3349 | |
a737b3e2 | 3350 | unwind_oom: |
1da177e4 LT |
3351 | while (--i >= 0) { |
3352 | if (!cpu_possible(i)) | |
3353 | continue; | |
3354 | kfree(pdata->ptrs[i]); | |
3355 | } | |
3356 | kfree(pdata); | |
3357 | return NULL; | |
3358 | } | |
3359 | EXPORT_SYMBOL(__alloc_percpu); | |
3360 | #endif | |
3361 | ||
3362 | /** | |
3363 | * kmem_cache_free - Deallocate an object | |
3364 | * @cachep: The cache the allocation was from. | |
3365 | * @objp: The previously allocated object. | |
3366 | * | |
3367 | * Free an object which was previously allocated from this | |
3368 | * cache. | |
3369 | */ | |
343e0d7a | 3370 | void kmem_cache_free(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
3371 | { |
3372 | unsigned long flags; | |
3373 | ||
ddc2e812 PE |
3374 | BUG_ON(virt_to_cache(objp) != cachep); |
3375 | ||
1da177e4 LT |
3376 | local_irq_save(flags); |
3377 | __cache_free(cachep, objp); | |
3378 | local_irq_restore(flags); | |
3379 | } | |
3380 | EXPORT_SYMBOL(kmem_cache_free); | |
3381 | ||
1da177e4 LT |
3382 | /** |
3383 | * kfree - free previously allocated memory | |
3384 | * @objp: pointer returned by kmalloc. | |
3385 | * | |
80e93eff PE |
3386 | * If @objp is NULL, no operation is performed. |
3387 | * | |
1da177e4 LT |
3388 | * Don't free memory not originally allocated by kmalloc() |
3389 | * or you will run into trouble. | |
3390 | */ | |
3391 | void kfree(const void *objp) | |
3392 | { | |
343e0d7a | 3393 | struct kmem_cache *c; |
1da177e4 LT |
3394 | unsigned long flags; |
3395 | ||
3396 | if (unlikely(!objp)) | |
3397 | return; | |
3398 | local_irq_save(flags); | |
3399 | kfree_debugcheck(objp); | |
6ed5eb22 | 3400 | c = virt_to_cache(objp); |
f9b8404c | 3401 | debug_check_no_locks_freed(objp, obj_size(c)); |
b28a02de | 3402 | __cache_free(c, (void *)objp); |
1da177e4 LT |
3403 | local_irq_restore(flags); |
3404 | } | |
3405 | EXPORT_SYMBOL(kfree); | |
3406 | ||
3407 | #ifdef CONFIG_SMP | |
3408 | /** | |
3409 | * free_percpu - free previously allocated percpu memory | |
3410 | * @objp: pointer returned by alloc_percpu. | |
3411 | * | |
3412 | * Don't free memory not originally allocated by alloc_percpu() | |
3413 | * The complemented objp is to check for that. | |
3414 | */ | |
b28a02de | 3415 | void free_percpu(const void *objp) |
1da177e4 LT |
3416 | { |
3417 | int i; | |
b28a02de | 3418 | struct percpu_data *p = (struct percpu_data *)(~(unsigned long)objp); |
1da177e4 | 3419 | |
e498be7d CL |
3420 | /* |
3421 | * We allocate for all cpus so we cannot use for online cpu here. | |
3422 | */ | |
0a945022 | 3423 | for_each_possible_cpu(i) |
b28a02de | 3424 | kfree(p->ptrs[i]); |
1da177e4 LT |
3425 | kfree(p); |
3426 | } | |
3427 | EXPORT_SYMBOL(free_percpu); | |
3428 | #endif | |
3429 | ||
343e0d7a | 3430 | unsigned int kmem_cache_size(struct kmem_cache *cachep) |
1da177e4 | 3431 | { |
3dafccf2 | 3432 | return obj_size(cachep); |
1da177e4 LT |
3433 | } |
3434 | EXPORT_SYMBOL(kmem_cache_size); | |
3435 | ||
343e0d7a | 3436 | const char *kmem_cache_name(struct kmem_cache *cachep) |
1944972d ACM |
3437 | { |
3438 | return cachep->name; | |
3439 | } | |
3440 | EXPORT_SYMBOL_GPL(kmem_cache_name); | |
3441 | ||
e498be7d | 3442 | /* |
0718dc2a | 3443 | * This initializes kmem_list3 or resizes varioius caches for all nodes. |
e498be7d | 3444 | */ |
343e0d7a | 3445 | static int alloc_kmemlist(struct kmem_cache *cachep) |
e498be7d CL |
3446 | { |
3447 | int node; | |
3448 | struct kmem_list3 *l3; | |
cafeb02e CL |
3449 | struct array_cache *new_shared; |
3450 | struct array_cache **new_alien; | |
e498be7d CL |
3451 | |
3452 | for_each_online_node(node) { | |
cafeb02e | 3453 | |
a737b3e2 AM |
3454 | new_alien = alloc_alien_cache(node, cachep->limit); |
3455 | if (!new_alien) | |
e498be7d | 3456 | goto fail; |
cafeb02e | 3457 | |
0718dc2a CL |
3458 | new_shared = alloc_arraycache(node, |
3459 | cachep->shared*cachep->batchcount, | |
a737b3e2 | 3460 | 0xbaadf00d); |
0718dc2a CL |
3461 | if (!new_shared) { |
3462 | free_alien_cache(new_alien); | |
e498be7d | 3463 | goto fail; |
0718dc2a | 3464 | } |
cafeb02e | 3465 | |
a737b3e2 AM |
3466 | l3 = cachep->nodelists[node]; |
3467 | if (l3) { | |
cafeb02e CL |
3468 | struct array_cache *shared = l3->shared; |
3469 | ||
e498be7d CL |
3470 | spin_lock_irq(&l3->list_lock); |
3471 | ||
cafeb02e | 3472 | if (shared) |
0718dc2a CL |
3473 | free_block(cachep, shared->entry, |
3474 | shared->avail, node); | |
e498be7d | 3475 | |
cafeb02e CL |
3476 | l3->shared = new_shared; |
3477 | if (!l3->alien) { | |
e498be7d CL |
3478 | l3->alien = new_alien; |
3479 | new_alien = NULL; | |
3480 | } | |
b28a02de | 3481 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 3482 | cachep->batchcount + cachep->num; |
e498be7d | 3483 | spin_unlock_irq(&l3->list_lock); |
cafeb02e | 3484 | kfree(shared); |
e498be7d CL |
3485 | free_alien_cache(new_alien); |
3486 | continue; | |
3487 | } | |
a737b3e2 | 3488 | l3 = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, node); |
0718dc2a CL |
3489 | if (!l3) { |
3490 | free_alien_cache(new_alien); | |
3491 | kfree(new_shared); | |
e498be7d | 3492 | goto fail; |
0718dc2a | 3493 | } |
e498be7d CL |
3494 | |
3495 | kmem_list3_init(l3); | |
3496 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
a737b3e2 | 3497 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
cafeb02e | 3498 | l3->shared = new_shared; |
e498be7d | 3499 | l3->alien = new_alien; |
b28a02de | 3500 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 3501 | cachep->batchcount + cachep->num; |
e498be7d CL |
3502 | cachep->nodelists[node] = l3; |
3503 | } | |
cafeb02e | 3504 | return 0; |
0718dc2a | 3505 | |
a737b3e2 | 3506 | fail: |
0718dc2a CL |
3507 | if (!cachep->next.next) { |
3508 | /* Cache is not active yet. Roll back what we did */ | |
3509 | node--; | |
3510 | while (node >= 0) { | |
3511 | if (cachep->nodelists[node]) { | |
3512 | l3 = cachep->nodelists[node]; | |
3513 | ||
3514 | kfree(l3->shared); | |
3515 | free_alien_cache(l3->alien); | |
3516 | kfree(l3); | |
3517 | cachep->nodelists[node] = NULL; | |
3518 | } | |
3519 | node--; | |
3520 | } | |
3521 | } | |
cafeb02e | 3522 | return -ENOMEM; |
e498be7d CL |
3523 | } |
3524 | ||
1da177e4 | 3525 | struct ccupdate_struct { |
343e0d7a | 3526 | struct kmem_cache *cachep; |
1da177e4 LT |
3527 | struct array_cache *new[NR_CPUS]; |
3528 | }; | |
3529 | ||
3530 | static void do_ccupdate_local(void *info) | |
3531 | { | |
a737b3e2 | 3532 | struct ccupdate_struct *new = info; |
1da177e4 LT |
3533 | struct array_cache *old; |
3534 | ||
3535 | check_irq_off(); | |
9a2dba4b | 3536 | old = cpu_cache_get(new->cachep); |
e498be7d | 3537 | |
1da177e4 LT |
3538 | new->cachep->array[smp_processor_id()] = new->new[smp_processor_id()]; |
3539 | new->new[smp_processor_id()] = old; | |
3540 | } | |
3541 | ||
b5d8ca7c | 3542 | /* Always called with the cache_chain_mutex held */ |
a737b3e2 AM |
3543 | static int do_tune_cpucache(struct kmem_cache *cachep, int limit, |
3544 | int batchcount, int shared) | |
1da177e4 LT |
3545 | { |
3546 | struct ccupdate_struct new; | |
e498be7d | 3547 | int i, err; |
1da177e4 | 3548 | |
b28a02de | 3549 | memset(&new.new, 0, sizeof(new.new)); |
e498be7d | 3550 | for_each_online_cpu(i) { |
a737b3e2 AM |
3551 | new.new[i] = alloc_arraycache(cpu_to_node(i), limit, |
3552 | batchcount); | |
e498be7d | 3553 | if (!new.new[i]) { |
b28a02de PE |
3554 | for (i--; i >= 0; i--) |
3555 | kfree(new.new[i]); | |
e498be7d | 3556 | return -ENOMEM; |
1da177e4 LT |
3557 | } |
3558 | } | |
3559 | new.cachep = cachep; | |
3560 | ||
a07fa394 | 3561 | on_each_cpu(do_ccupdate_local, (void *)&new, 1, 1); |
e498be7d | 3562 | |
1da177e4 | 3563 | check_irq_on(); |
1da177e4 LT |
3564 | cachep->batchcount = batchcount; |
3565 | cachep->limit = limit; | |
e498be7d | 3566 | cachep->shared = shared; |
1da177e4 | 3567 | |
e498be7d | 3568 | for_each_online_cpu(i) { |
1da177e4 LT |
3569 | struct array_cache *ccold = new.new[i]; |
3570 | if (!ccold) | |
3571 | continue; | |
e498be7d | 3572 | spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
ff69416e | 3573 | free_block(cachep, ccold->entry, ccold->avail, cpu_to_node(i)); |
e498be7d | 3574 | spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
1da177e4 LT |
3575 | kfree(ccold); |
3576 | } | |
1da177e4 | 3577 | |
e498be7d CL |
3578 | err = alloc_kmemlist(cachep); |
3579 | if (err) { | |
3580 | printk(KERN_ERR "alloc_kmemlist failed for %s, error %d.\n", | |
b28a02de | 3581 | cachep->name, -err); |
e498be7d | 3582 | BUG(); |
1da177e4 | 3583 | } |
1da177e4 LT |
3584 | return 0; |
3585 | } | |
3586 | ||
b5d8ca7c | 3587 | /* Called with cache_chain_mutex held always */ |
343e0d7a | 3588 | static void enable_cpucache(struct kmem_cache *cachep) |
1da177e4 LT |
3589 | { |
3590 | int err; | |
3591 | int limit, shared; | |
3592 | ||
a737b3e2 AM |
3593 | /* |
3594 | * The head array serves three purposes: | |
1da177e4 LT |
3595 | * - create a LIFO ordering, i.e. return objects that are cache-warm |
3596 | * - reduce the number of spinlock operations. | |
a737b3e2 | 3597 | * - reduce the number of linked list operations on the slab and |
1da177e4 LT |
3598 | * bufctl chains: array operations are cheaper. |
3599 | * The numbers are guessed, we should auto-tune as described by | |
3600 | * Bonwick. | |
3601 | */ | |
3dafccf2 | 3602 | if (cachep->buffer_size > 131072) |
1da177e4 | 3603 | limit = 1; |
3dafccf2 | 3604 | else if (cachep->buffer_size > PAGE_SIZE) |
1da177e4 | 3605 | limit = 8; |
3dafccf2 | 3606 | else if (cachep->buffer_size > 1024) |
1da177e4 | 3607 | limit = 24; |
3dafccf2 | 3608 | else if (cachep->buffer_size > 256) |
1da177e4 LT |
3609 | limit = 54; |
3610 | else | |
3611 | limit = 120; | |
3612 | ||
a737b3e2 AM |
3613 | /* |
3614 | * CPU bound tasks (e.g. network routing) can exhibit cpu bound | |
1da177e4 LT |
3615 | * allocation behaviour: Most allocs on one cpu, most free operations |
3616 | * on another cpu. For these cases, an efficient object passing between | |
3617 | * cpus is necessary. This is provided by a shared array. The array | |
3618 | * replaces Bonwick's magazine layer. | |
3619 | * On uniprocessor, it's functionally equivalent (but less efficient) | |
3620 | * to a larger limit. Thus disabled by default. | |
3621 | */ | |
3622 | shared = 0; | |
3623 | #ifdef CONFIG_SMP | |
3dafccf2 | 3624 | if (cachep->buffer_size <= PAGE_SIZE) |
1da177e4 LT |
3625 | shared = 8; |
3626 | #endif | |
3627 | ||
3628 | #if DEBUG | |
a737b3e2 AM |
3629 | /* |
3630 | * With debugging enabled, large batchcount lead to excessively long | |
3631 | * periods with disabled local interrupts. Limit the batchcount | |
1da177e4 LT |
3632 | */ |
3633 | if (limit > 32) | |
3634 | limit = 32; | |
3635 | #endif | |
b28a02de | 3636 | err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared); |
1da177e4 LT |
3637 | if (err) |
3638 | printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n", | |
b28a02de | 3639 | cachep->name, -err); |
1da177e4 LT |
3640 | } |
3641 | ||
1b55253a CL |
3642 | /* |
3643 | * Drain an array if it contains any elements taking the l3 lock only if | |
b18e7e65 CL |
3644 | * necessary. Note that the l3 listlock also protects the array_cache |
3645 | * if drain_array() is used on the shared array. | |
1b55253a CL |
3646 | */ |
3647 | void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, | |
3648 | struct array_cache *ac, int force, int node) | |
1da177e4 LT |
3649 | { |
3650 | int tofree; | |
3651 | ||
1b55253a CL |
3652 | if (!ac || !ac->avail) |
3653 | return; | |
1da177e4 LT |
3654 | if (ac->touched && !force) { |
3655 | ac->touched = 0; | |
b18e7e65 | 3656 | } else { |
1b55253a | 3657 | spin_lock_irq(&l3->list_lock); |
b18e7e65 CL |
3658 | if (ac->avail) { |
3659 | tofree = force ? ac->avail : (ac->limit + 4) / 5; | |
3660 | if (tofree > ac->avail) | |
3661 | tofree = (ac->avail + 1) / 2; | |
3662 | free_block(cachep, ac->entry, tofree, node); | |
3663 | ac->avail -= tofree; | |
3664 | memmove(ac->entry, &(ac->entry[tofree]), | |
3665 | sizeof(void *) * ac->avail); | |
3666 | } | |
1b55253a | 3667 | spin_unlock_irq(&l3->list_lock); |
1da177e4 LT |
3668 | } |
3669 | } | |
3670 | ||
3671 | /** | |
3672 | * cache_reap - Reclaim memory from caches. | |
1e5d5331 | 3673 | * @unused: unused parameter |
1da177e4 LT |
3674 | * |
3675 | * Called from workqueue/eventd every few seconds. | |
3676 | * Purpose: | |
3677 | * - clear the per-cpu caches for this CPU. | |
3678 | * - return freeable pages to the main free memory pool. | |
3679 | * | |
a737b3e2 AM |
3680 | * If we cannot acquire the cache chain mutex then just give up - we'll try |
3681 | * again on the next iteration. | |
1da177e4 LT |
3682 | */ |
3683 | static void cache_reap(void *unused) | |
3684 | { | |
7a7c381d | 3685 | struct kmem_cache *searchp; |
e498be7d | 3686 | struct kmem_list3 *l3; |
aab2207c | 3687 | int node = numa_node_id(); |
1da177e4 | 3688 | |
fc0abb14 | 3689 | if (!mutex_trylock(&cache_chain_mutex)) { |
1da177e4 | 3690 | /* Give up. Setup the next iteration. */ |
b28a02de PE |
3691 | schedule_delayed_work(&__get_cpu_var(reap_work), |
3692 | REAPTIMEOUT_CPUC); | |
1da177e4 LT |
3693 | return; |
3694 | } | |
3695 | ||
7a7c381d | 3696 | list_for_each_entry(searchp, &cache_chain, next) { |
b28a02de | 3697 | struct list_head *p; |
1da177e4 LT |
3698 | int tofree; |
3699 | struct slab *slabp; | |
3700 | ||
1da177e4 LT |
3701 | check_irq_on(); |
3702 | ||
35386e3b CL |
3703 | /* |
3704 | * We only take the l3 lock if absolutely necessary and we | |
3705 | * have established with reasonable certainty that | |
3706 | * we can do some work if the lock was obtained. | |
3707 | */ | |
aab2207c | 3708 | l3 = searchp->nodelists[node]; |
35386e3b | 3709 | |
8fce4d8e | 3710 | reap_alien(searchp, l3); |
1da177e4 | 3711 | |
aab2207c | 3712 | drain_array(searchp, l3, cpu_cache_get(searchp), 0, node); |
1da177e4 | 3713 | |
35386e3b CL |
3714 | /* |
3715 | * These are racy checks but it does not matter | |
3716 | * if we skip one check or scan twice. | |
3717 | */ | |
e498be7d | 3718 | if (time_after(l3->next_reap, jiffies)) |
35386e3b | 3719 | goto next; |
1da177e4 | 3720 | |
e498be7d | 3721 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3; |
1da177e4 | 3722 | |
aab2207c | 3723 | drain_array(searchp, l3, l3->shared, 0, node); |
1da177e4 | 3724 | |
e498be7d CL |
3725 | if (l3->free_touched) { |
3726 | l3->free_touched = 0; | |
35386e3b | 3727 | goto next; |
1da177e4 LT |
3728 | } |
3729 | ||
a737b3e2 AM |
3730 | tofree = (l3->free_limit + 5 * searchp->num - 1) / |
3731 | (5 * searchp->num); | |
1da177e4 | 3732 | do { |
35386e3b CL |
3733 | /* |
3734 | * Do not lock if there are no free blocks. | |
3735 | */ | |
3736 | if (list_empty(&l3->slabs_free)) | |
3737 | break; | |
3738 | ||
3739 | spin_lock_irq(&l3->list_lock); | |
e498be7d | 3740 | p = l3->slabs_free.next; |
35386e3b CL |
3741 | if (p == &(l3->slabs_free)) { |
3742 | spin_unlock_irq(&l3->list_lock); | |
1da177e4 | 3743 | break; |
35386e3b | 3744 | } |
1da177e4 LT |
3745 | |
3746 | slabp = list_entry(p, struct slab, list); | |
3747 | BUG_ON(slabp->inuse); | |
3748 | list_del(&slabp->list); | |
3749 | STATS_INC_REAPED(searchp); | |
3750 | ||
a737b3e2 AM |
3751 | /* |
3752 | * Safe to drop the lock. The slab is no longer linked | |
3753 | * to the cache. searchp cannot disappear, we hold | |
1da177e4 LT |
3754 | * cache_chain_lock |
3755 | */ | |
e498be7d CL |
3756 | l3->free_objects -= searchp->num; |
3757 | spin_unlock_irq(&l3->list_lock); | |
1da177e4 | 3758 | slab_destroy(searchp, slabp); |
b28a02de | 3759 | } while (--tofree > 0); |
35386e3b | 3760 | next: |
1da177e4 LT |
3761 | cond_resched(); |
3762 | } | |
3763 | check_irq_on(); | |
fc0abb14 | 3764 | mutex_unlock(&cache_chain_mutex); |
8fce4d8e | 3765 | next_reap_node(); |
a737b3e2 | 3766 | /* Set up the next iteration */ |
cd61ef62 | 3767 | schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC); |
1da177e4 LT |
3768 | } |
3769 | ||
3770 | #ifdef CONFIG_PROC_FS | |
3771 | ||
85289f98 | 3772 | static void print_slabinfo_header(struct seq_file *m) |
1da177e4 | 3773 | { |
85289f98 PE |
3774 | /* |
3775 | * Output format version, so at least we can change it | |
3776 | * without _too_ many complaints. | |
3777 | */ | |
1da177e4 | 3778 | #if STATS |
85289f98 | 3779 | seq_puts(m, "slabinfo - version: 2.1 (statistics)\n"); |
1da177e4 | 3780 | #else |
85289f98 | 3781 | seq_puts(m, "slabinfo - version: 2.1\n"); |
1da177e4 | 3782 | #endif |
85289f98 PE |
3783 | seq_puts(m, "# name <active_objs> <num_objs> <objsize> " |
3784 | "<objperslab> <pagesperslab>"); | |
3785 | seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>"); | |
3786 | seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); | |
1da177e4 | 3787 | #if STATS |
85289f98 | 3788 | seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> " |
fb7faf33 | 3789 | "<error> <maxfreeable> <nodeallocs> <remotefrees> <alienoverflow>"); |
85289f98 | 3790 | seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>"); |
1da177e4 | 3791 | #endif |
85289f98 PE |
3792 | seq_putc(m, '\n'); |
3793 | } | |
3794 | ||
3795 | static void *s_start(struct seq_file *m, loff_t *pos) | |
3796 | { | |
3797 | loff_t n = *pos; | |
3798 | struct list_head *p; | |
3799 | ||
fc0abb14 | 3800 | mutex_lock(&cache_chain_mutex); |
85289f98 PE |
3801 | if (!n) |
3802 | print_slabinfo_header(m); | |
1da177e4 LT |
3803 | p = cache_chain.next; |
3804 | while (n--) { | |
3805 | p = p->next; | |
3806 | if (p == &cache_chain) | |
3807 | return NULL; | |
3808 | } | |
343e0d7a | 3809 | return list_entry(p, struct kmem_cache, next); |
1da177e4 LT |
3810 | } |
3811 | ||
3812 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) | |
3813 | { | |
343e0d7a | 3814 | struct kmem_cache *cachep = p; |
1da177e4 | 3815 | ++*pos; |
a737b3e2 AM |
3816 | return cachep->next.next == &cache_chain ? |
3817 | NULL : list_entry(cachep->next.next, struct kmem_cache, next); | |
1da177e4 LT |
3818 | } |
3819 | ||
3820 | static void s_stop(struct seq_file *m, void *p) | |
3821 | { | |
fc0abb14 | 3822 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
3823 | } |
3824 | ||
3825 | static int s_show(struct seq_file *m, void *p) | |
3826 | { | |
343e0d7a | 3827 | struct kmem_cache *cachep = p; |
b28a02de PE |
3828 | struct slab *slabp; |
3829 | unsigned long active_objs; | |
3830 | unsigned long num_objs; | |
3831 | unsigned long active_slabs = 0; | |
3832 | unsigned long num_slabs, free_objects = 0, shared_avail = 0; | |
e498be7d | 3833 | const char *name; |
1da177e4 | 3834 | char *error = NULL; |
e498be7d CL |
3835 | int node; |
3836 | struct kmem_list3 *l3; | |
1da177e4 | 3837 | |
1da177e4 LT |
3838 | active_objs = 0; |
3839 | num_slabs = 0; | |
e498be7d CL |
3840 | for_each_online_node(node) { |
3841 | l3 = cachep->nodelists[node]; | |
3842 | if (!l3) | |
3843 | continue; | |
3844 | ||
ca3b9b91 RT |
3845 | check_irq_on(); |
3846 | spin_lock_irq(&l3->list_lock); | |
e498be7d | 3847 | |
7a7c381d | 3848 | list_for_each_entry(slabp, &l3->slabs_full, list) { |
e498be7d CL |
3849 | if (slabp->inuse != cachep->num && !error) |
3850 | error = "slabs_full accounting error"; | |
3851 | active_objs += cachep->num; | |
3852 | active_slabs++; | |
3853 | } | |
7a7c381d | 3854 | list_for_each_entry(slabp, &l3->slabs_partial, list) { |
e498be7d CL |
3855 | if (slabp->inuse == cachep->num && !error) |
3856 | error = "slabs_partial inuse accounting error"; | |
3857 | if (!slabp->inuse && !error) | |
3858 | error = "slabs_partial/inuse accounting error"; | |
3859 | active_objs += slabp->inuse; | |
3860 | active_slabs++; | |
3861 | } | |
7a7c381d | 3862 | list_for_each_entry(slabp, &l3->slabs_free, list) { |
e498be7d CL |
3863 | if (slabp->inuse && !error) |
3864 | error = "slabs_free/inuse accounting error"; | |
3865 | num_slabs++; | |
3866 | } | |
3867 | free_objects += l3->free_objects; | |
4484ebf1 RT |
3868 | if (l3->shared) |
3869 | shared_avail += l3->shared->avail; | |
e498be7d | 3870 | |
ca3b9b91 | 3871 | spin_unlock_irq(&l3->list_lock); |
1da177e4 | 3872 | } |
b28a02de PE |
3873 | num_slabs += active_slabs; |
3874 | num_objs = num_slabs * cachep->num; | |
e498be7d | 3875 | if (num_objs - active_objs != free_objects && !error) |
1da177e4 LT |
3876 | error = "free_objects accounting error"; |
3877 | ||
b28a02de | 3878 | name = cachep->name; |
1da177e4 LT |
3879 | if (error) |
3880 | printk(KERN_ERR "slab: cache %s error: %s\n", name, error); | |
3881 | ||
3882 | seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", | |
3dafccf2 | 3883 | name, active_objs, num_objs, cachep->buffer_size, |
b28a02de | 3884 | cachep->num, (1 << cachep->gfporder)); |
1da177e4 | 3885 | seq_printf(m, " : tunables %4u %4u %4u", |
b28a02de | 3886 | cachep->limit, cachep->batchcount, cachep->shared); |
e498be7d | 3887 | seq_printf(m, " : slabdata %6lu %6lu %6lu", |
b28a02de | 3888 | active_slabs, num_slabs, shared_avail); |
1da177e4 | 3889 | #if STATS |
b28a02de | 3890 | { /* list3 stats */ |
1da177e4 LT |
3891 | unsigned long high = cachep->high_mark; |
3892 | unsigned long allocs = cachep->num_allocations; | |
3893 | unsigned long grown = cachep->grown; | |
3894 | unsigned long reaped = cachep->reaped; | |
3895 | unsigned long errors = cachep->errors; | |
3896 | unsigned long max_freeable = cachep->max_freeable; | |
1da177e4 | 3897 | unsigned long node_allocs = cachep->node_allocs; |
e498be7d | 3898 | unsigned long node_frees = cachep->node_frees; |
fb7faf33 | 3899 | unsigned long overflows = cachep->node_overflow; |
1da177e4 | 3900 | |
e498be7d | 3901 | seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \ |
fb7faf33 | 3902 | %4lu %4lu %4lu %4lu %4lu", allocs, high, grown, |
a737b3e2 | 3903 | reaped, errors, max_freeable, node_allocs, |
fb7faf33 | 3904 | node_frees, overflows); |
1da177e4 LT |
3905 | } |
3906 | /* cpu stats */ | |
3907 | { | |
3908 | unsigned long allochit = atomic_read(&cachep->allochit); | |
3909 | unsigned long allocmiss = atomic_read(&cachep->allocmiss); | |
3910 | unsigned long freehit = atomic_read(&cachep->freehit); | |
3911 | unsigned long freemiss = atomic_read(&cachep->freemiss); | |
3912 | ||
3913 | seq_printf(m, " : cpustat %6lu %6lu %6lu %6lu", | |
b28a02de | 3914 | allochit, allocmiss, freehit, freemiss); |
1da177e4 LT |
3915 | } |
3916 | #endif | |
3917 | seq_putc(m, '\n'); | |
1da177e4 LT |
3918 | return 0; |
3919 | } | |
3920 | ||
3921 | /* | |
3922 | * slabinfo_op - iterator that generates /proc/slabinfo | |
3923 | * | |
3924 | * Output layout: | |
3925 | * cache-name | |
3926 | * num-active-objs | |
3927 | * total-objs | |
3928 | * object size | |
3929 | * num-active-slabs | |
3930 | * total-slabs | |
3931 | * num-pages-per-slab | |
3932 | * + further values on SMP and with statistics enabled | |
3933 | */ | |
3934 | ||
3935 | struct seq_operations slabinfo_op = { | |
b28a02de PE |
3936 | .start = s_start, |
3937 | .next = s_next, | |
3938 | .stop = s_stop, | |
3939 | .show = s_show, | |
1da177e4 LT |
3940 | }; |
3941 | ||
3942 | #define MAX_SLABINFO_WRITE 128 | |
3943 | /** | |
3944 | * slabinfo_write - Tuning for the slab allocator | |
3945 | * @file: unused | |
3946 | * @buffer: user buffer | |
3947 | * @count: data length | |
3948 | * @ppos: unused | |
3949 | */ | |
b28a02de PE |
3950 | ssize_t slabinfo_write(struct file *file, const char __user * buffer, |
3951 | size_t count, loff_t *ppos) | |
1da177e4 | 3952 | { |
b28a02de | 3953 | char kbuf[MAX_SLABINFO_WRITE + 1], *tmp; |
1da177e4 | 3954 | int limit, batchcount, shared, res; |
7a7c381d | 3955 | struct kmem_cache *cachep; |
b28a02de | 3956 | |
1da177e4 LT |
3957 | if (count > MAX_SLABINFO_WRITE) |
3958 | return -EINVAL; | |
3959 | if (copy_from_user(&kbuf, buffer, count)) | |
3960 | return -EFAULT; | |
b28a02de | 3961 | kbuf[MAX_SLABINFO_WRITE] = '\0'; |
1da177e4 LT |
3962 | |
3963 | tmp = strchr(kbuf, ' '); | |
3964 | if (!tmp) | |
3965 | return -EINVAL; | |
3966 | *tmp = '\0'; | |
3967 | tmp++; | |
3968 | if (sscanf(tmp, " %d %d %d", &limit, &batchcount, &shared) != 3) | |
3969 | return -EINVAL; | |
3970 | ||
3971 | /* Find the cache in the chain of caches. */ | |
fc0abb14 | 3972 | mutex_lock(&cache_chain_mutex); |
1da177e4 | 3973 | res = -EINVAL; |
7a7c381d | 3974 | list_for_each_entry(cachep, &cache_chain, next) { |
1da177e4 | 3975 | if (!strcmp(cachep->name, kbuf)) { |
a737b3e2 AM |
3976 | if (limit < 1 || batchcount < 1 || |
3977 | batchcount > limit || shared < 0) { | |
e498be7d | 3978 | res = 0; |
1da177e4 | 3979 | } else { |
e498be7d | 3980 | res = do_tune_cpucache(cachep, limit, |
b28a02de | 3981 | batchcount, shared); |
1da177e4 LT |
3982 | } |
3983 | break; | |
3984 | } | |
3985 | } | |
fc0abb14 | 3986 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
3987 | if (res >= 0) |
3988 | res = count; | |
3989 | return res; | |
3990 | } | |
871751e2 AV |
3991 | |
3992 | #ifdef CONFIG_DEBUG_SLAB_LEAK | |
3993 | ||
3994 | static void *leaks_start(struct seq_file *m, loff_t *pos) | |
3995 | { | |
3996 | loff_t n = *pos; | |
3997 | struct list_head *p; | |
3998 | ||
3999 | mutex_lock(&cache_chain_mutex); | |
4000 | p = cache_chain.next; | |
4001 | while (n--) { | |
4002 | p = p->next; | |
4003 | if (p == &cache_chain) | |
4004 | return NULL; | |
4005 | } | |
4006 | return list_entry(p, struct kmem_cache, next); | |
4007 | } | |
4008 | ||
4009 | static inline int add_caller(unsigned long *n, unsigned long v) | |
4010 | { | |
4011 | unsigned long *p; | |
4012 | int l; | |
4013 | if (!v) | |
4014 | return 1; | |
4015 | l = n[1]; | |
4016 | p = n + 2; | |
4017 | while (l) { | |
4018 | int i = l/2; | |
4019 | unsigned long *q = p + 2 * i; | |
4020 | if (*q == v) { | |
4021 | q[1]++; | |
4022 | return 1; | |
4023 | } | |
4024 | if (*q > v) { | |
4025 | l = i; | |
4026 | } else { | |
4027 | p = q + 2; | |
4028 | l -= i + 1; | |
4029 | } | |
4030 | } | |
4031 | if (++n[1] == n[0]) | |
4032 | return 0; | |
4033 | memmove(p + 2, p, n[1] * 2 * sizeof(unsigned long) - ((void *)p - (void *)n)); | |
4034 | p[0] = v; | |
4035 | p[1] = 1; | |
4036 | return 1; | |
4037 | } | |
4038 | ||
4039 | static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s) | |
4040 | { | |
4041 | void *p; | |
4042 | int i; | |
4043 | if (n[0] == n[1]) | |
4044 | return; | |
4045 | for (i = 0, p = s->s_mem; i < c->num; i++, p += c->buffer_size) { | |
4046 | if (slab_bufctl(s)[i] != BUFCTL_ACTIVE) | |
4047 | continue; | |
4048 | if (!add_caller(n, (unsigned long)*dbg_userword(c, p))) | |
4049 | return; | |
4050 | } | |
4051 | } | |
4052 | ||
4053 | static void show_symbol(struct seq_file *m, unsigned long address) | |
4054 | { | |
4055 | #ifdef CONFIG_KALLSYMS | |
4056 | char *modname; | |
4057 | const char *name; | |
4058 | unsigned long offset, size; | |
4059 | char namebuf[KSYM_NAME_LEN+1]; | |
4060 | ||
4061 | name = kallsyms_lookup(address, &size, &offset, &modname, namebuf); | |
4062 | ||
4063 | if (name) { | |
4064 | seq_printf(m, "%s+%#lx/%#lx", name, offset, size); | |
4065 | if (modname) | |
4066 | seq_printf(m, " [%s]", modname); | |
4067 | return; | |
4068 | } | |
4069 | #endif | |
4070 | seq_printf(m, "%p", (void *)address); | |
4071 | } | |
4072 | ||
4073 | static int leaks_show(struct seq_file *m, void *p) | |
4074 | { | |
4075 | struct kmem_cache *cachep = p; | |
871751e2 AV |
4076 | struct slab *slabp; |
4077 | struct kmem_list3 *l3; | |
4078 | const char *name; | |
4079 | unsigned long *n = m->private; | |
4080 | int node; | |
4081 | int i; | |
4082 | ||
4083 | if (!(cachep->flags & SLAB_STORE_USER)) | |
4084 | return 0; | |
4085 | if (!(cachep->flags & SLAB_RED_ZONE)) | |
4086 | return 0; | |
4087 | ||
4088 | /* OK, we can do it */ | |
4089 | ||
4090 | n[1] = 0; | |
4091 | ||
4092 | for_each_online_node(node) { | |
4093 | l3 = cachep->nodelists[node]; | |
4094 | if (!l3) | |
4095 | continue; | |
4096 | ||
4097 | check_irq_on(); | |
4098 | spin_lock_irq(&l3->list_lock); | |
4099 | ||
7a7c381d | 4100 | list_for_each_entry(slabp, &l3->slabs_full, list) |
871751e2 | 4101 | handle_slab(n, cachep, slabp); |
7a7c381d | 4102 | list_for_each_entry(slabp, &l3->slabs_partial, list) |
871751e2 | 4103 | handle_slab(n, cachep, slabp); |
871751e2 AV |
4104 | spin_unlock_irq(&l3->list_lock); |
4105 | } | |
4106 | name = cachep->name; | |
4107 | if (n[0] == n[1]) { | |
4108 | /* Increase the buffer size */ | |
4109 | mutex_unlock(&cache_chain_mutex); | |
4110 | m->private = kzalloc(n[0] * 4 * sizeof(unsigned long), GFP_KERNEL); | |
4111 | if (!m->private) { | |
4112 | /* Too bad, we are really out */ | |
4113 | m->private = n; | |
4114 | mutex_lock(&cache_chain_mutex); | |
4115 | return -ENOMEM; | |
4116 | } | |
4117 | *(unsigned long *)m->private = n[0] * 2; | |
4118 | kfree(n); | |
4119 | mutex_lock(&cache_chain_mutex); | |
4120 | /* Now make sure this entry will be retried */ | |
4121 | m->count = m->size; | |
4122 | return 0; | |
4123 | } | |
4124 | for (i = 0; i < n[1]; i++) { | |
4125 | seq_printf(m, "%s: %lu ", name, n[2*i+3]); | |
4126 | show_symbol(m, n[2*i+2]); | |
4127 | seq_putc(m, '\n'); | |
4128 | } | |
4129 | return 0; | |
4130 | } | |
4131 | ||
4132 | struct seq_operations slabstats_op = { | |
4133 | .start = leaks_start, | |
4134 | .next = s_next, | |
4135 | .stop = s_stop, | |
4136 | .show = leaks_show, | |
4137 | }; | |
4138 | #endif | |
1da177e4 LT |
4139 | #endif |
4140 | ||
00e145b6 MS |
4141 | /** |
4142 | * ksize - get the actual amount of memory allocated for a given object | |
4143 | * @objp: Pointer to the object | |
4144 | * | |
4145 | * kmalloc may internally round up allocations and return more memory | |
4146 | * than requested. ksize() can be used to determine the actual amount of | |
4147 | * memory allocated. The caller may use this additional memory, even though | |
4148 | * a smaller amount of memory was initially specified with the kmalloc call. | |
4149 | * The caller must guarantee that objp points to a valid object previously | |
4150 | * allocated with either kmalloc() or kmem_cache_alloc(). The object | |
4151 | * must not be freed during the duration of the call. | |
4152 | */ | |
1da177e4 LT |
4153 | unsigned int ksize(const void *objp) |
4154 | { | |
00e145b6 MS |
4155 | if (unlikely(objp == NULL)) |
4156 | return 0; | |
1da177e4 | 4157 | |
6ed5eb22 | 4158 | return obj_size(virt_to_cache(objp)); |
1da177e4 | 4159 | } |