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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 | ||
1da177e4 LT |
89 | #include <linux/slab.h> |
90 | #include <linux/mm.h> | |
c9cf5528 | 91 | #include <linux/poison.h> |
1da177e4 LT |
92 | #include <linux/swap.h> |
93 | #include <linux/cache.h> | |
94 | #include <linux/interrupt.h> | |
95 | #include <linux/init.h> | |
96 | #include <linux/compiler.h> | |
101a5001 | 97 | #include <linux/cpuset.h> |
1da177e4 LT |
98 | #include <linux/seq_file.h> |
99 | #include <linux/notifier.h> | |
100 | #include <linux/kallsyms.h> | |
101 | #include <linux/cpu.h> | |
102 | #include <linux/sysctl.h> | |
103 | #include <linux/module.h> | |
104 | #include <linux/rcupdate.h> | |
543537bd | 105 | #include <linux/string.h> |
138ae663 | 106 | #include <linux/uaccess.h> |
e498be7d | 107 | #include <linux/nodemask.h> |
dc85da15 | 108 | #include <linux/mempolicy.h> |
fc0abb14 | 109 | #include <linux/mutex.h> |
8a8b6502 | 110 | #include <linux/fault-inject.h> |
e7eebaf6 | 111 | #include <linux/rtmutex.h> |
6a2d7a95 | 112 | #include <linux/reciprocal_div.h> |
1da177e4 | 113 | |
1da177e4 LT |
114 | #include <asm/cacheflush.h> |
115 | #include <asm/tlbflush.h> | |
116 | #include <asm/page.h> | |
117 | ||
118 | /* | |
119 | * DEBUG - 1 for kmem_cache_create() to honour; SLAB_DEBUG_INITIAL, | |
120 | * SLAB_RED_ZONE & SLAB_POISON. | |
121 | * 0 for faster, smaller code (especially in the critical paths). | |
122 | * | |
123 | * STATS - 1 to collect stats for /proc/slabinfo. | |
124 | * 0 for faster, smaller code (especially in the critical paths). | |
125 | * | |
126 | * FORCED_DEBUG - 1 enables SLAB_RED_ZONE and SLAB_POISON (if possible) | |
127 | */ | |
128 | ||
129 | #ifdef CONFIG_DEBUG_SLAB | |
130 | #define DEBUG 1 | |
131 | #define STATS 1 | |
132 | #define FORCED_DEBUG 1 | |
133 | #else | |
134 | #define DEBUG 0 | |
135 | #define STATS 0 | |
136 | #define FORCED_DEBUG 0 | |
137 | #endif | |
138 | ||
1da177e4 LT |
139 | /* Shouldn't this be in a header file somewhere? */ |
140 | #define BYTES_PER_WORD sizeof(void *) | |
141 | ||
142 | #ifndef cache_line_size | |
143 | #define cache_line_size() L1_CACHE_BYTES | |
144 | #endif | |
145 | ||
146 | #ifndef ARCH_KMALLOC_MINALIGN | |
147 | /* | |
148 | * Enforce a minimum alignment for the kmalloc caches. | |
149 | * Usually, the kmalloc caches are cache_line_size() aligned, except when | |
150 | * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned. | |
151 | * Some archs want to perform DMA into kmalloc caches and need a guaranteed | |
152 | * alignment larger than BYTES_PER_WORD. ARCH_KMALLOC_MINALIGN allows that. | |
153 | * Note that this flag disables some debug features. | |
154 | */ | |
155 | #define ARCH_KMALLOC_MINALIGN 0 | |
156 | #endif | |
157 | ||
158 | #ifndef ARCH_SLAB_MINALIGN | |
159 | /* | |
160 | * Enforce a minimum alignment for all caches. | |
161 | * Intended for archs that get misalignment faults even for BYTES_PER_WORD | |
162 | * aligned buffers. Includes ARCH_KMALLOC_MINALIGN. | |
163 | * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables | |
164 | * some debug features. | |
165 | */ | |
166 | #define ARCH_SLAB_MINALIGN 0 | |
167 | #endif | |
168 | ||
169 | #ifndef ARCH_KMALLOC_FLAGS | |
170 | #define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN | |
171 | #endif | |
172 | ||
173 | /* Legal flag mask for kmem_cache_create(). */ | |
174 | #if DEBUG | |
175 | # define CREATE_MASK (SLAB_DEBUG_INITIAL | SLAB_RED_ZONE | \ | |
176 | SLAB_POISON | SLAB_HWCACHE_ALIGN | \ | |
ac2b898c | 177 | SLAB_CACHE_DMA | \ |
1da177e4 LT |
178 | SLAB_MUST_HWCACHE_ALIGN | SLAB_STORE_USER | \ |
179 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ | |
101a5001 | 180 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) |
1da177e4 | 181 | #else |
ac2b898c | 182 | # define CREATE_MASK (SLAB_HWCACHE_ALIGN | \ |
1da177e4 LT |
183 | SLAB_CACHE_DMA | SLAB_MUST_HWCACHE_ALIGN | \ |
184 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ | |
101a5001 | 185 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) |
1da177e4 LT |
186 | #endif |
187 | ||
188 | /* | |
189 | * kmem_bufctl_t: | |
190 | * | |
191 | * Bufctl's are used for linking objs within a slab | |
192 | * linked offsets. | |
193 | * | |
194 | * This implementation relies on "struct page" for locating the cache & | |
195 | * slab an object belongs to. | |
196 | * This allows the bufctl structure to be small (one int), but limits | |
197 | * the number of objects a slab (not a cache) can contain when off-slab | |
198 | * bufctls are used. The limit is the size of the largest general cache | |
199 | * that does not use off-slab slabs. | |
200 | * For 32bit archs with 4 kB pages, is this 56. | |
201 | * This is not serious, as it is only for large objects, when it is unwise | |
202 | * to have too many per slab. | |
203 | * Note: This limit can be raised by introducing a general cache whose size | |
204 | * is less than 512 (PAGE_SIZE<<3), but greater than 256. | |
205 | */ | |
206 | ||
fa5b08d5 | 207 | typedef unsigned int kmem_bufctl_t; |
1da177e4 LT |
208 | #define BUFCTL_END (((kmem_bufctl_t)(~0U))-0) |
209 | #define BUFCTL_FREE (((kmem_bufctl_t)(~0U))-1) | |
871751e2 AV |
210 | #define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2) |
211 | #define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3) | |
1da177e4 | 212 | |
1da177e4 LT |
213 | /* |
214 | * struct slab | |
215 | * | |
216 | * Manages the objs in a slab. Placed either at the beginning of mem allocated | |
217 | * for a slab, or allocated from an general cache. | |
218 | * Slabs are chained into three list: fully used, partial, fully free slabs. | |
219 | */ | |
220 | struct slab { | |
b28a02de PE |
221 | struct list_head list; |
222 | unsigned long colouroff; | |
223 | void *s_mem; /* including colour offset */ | |
224 | unsigned int inuse; /* num of objs active in slab */ | |
225 | kmem_bufctl_t free; | |
226 | unsigned short nodeid; | |
1da177e4 LT |
227 | }; |
228 | ||
229 | /* | |
230 | * struct slab_rcu | |
231 | * | |
232 | * slab_destroy on a SLAB_DESTROY_BY_RCU cache uses this structure to | |
233 | * arrange for kmem_freepages to be called via RCU. This is useful if | |
234 | * we need to approach a kernel structure obliquely, from its address | |
235 | * obtained without the usual locking. We can lock the structure to | |
236 | * stabilize it and check it's still at the given address, only if we | |
237 | * can be sure that the memory has not been meanwhile reused for some | |
238 | * other kind of object (which our subsystem's lock might corrupt). | |
239 | * | |
240 | * rcu_read_lock before reading the address, then rcu_read_unlock after | |
241 | * taking the spinlock within the structure expected at that address. | |
242 | * | |
243 | * We assume struct slab_rcu can overlay struct slab when destroying. | |
244 | */ | |
245 | struct slab_rcu { | |
b28a02de | 246 | struct rcu_head head; |
343e0d7a | 247 | struct kmem_cache *cachep; |
b28a02de | 248 | void *addr; |
1da177e4 LT |
249 | }; |
250 | ||
251 | /* | |
252 | * struct array_cache | |
253 | * | |
1da177e4 LT |
254 | * Purpose: |
255 | * - LIFO ordering, to hand out cache-warm objects from _alloc | |
256 | * - reduce the number of linked list operations | |
257 | * - reduce spinlock operations | |
258 | * | |
259 | * The limit is stored in the per-cpu structure to reduce the data cache | |
260 | * footprint. | |
261 | * | |
262 | */ | |
263 | struct array_cache { | |
264 | unsigned int avail; | |
265 | unsigned int limit; | |
266 | unsigned int batchcount; | |
267 | unsigned int touched; | |
e498be7d | 268 | spinlock_t lock; |
a737b3e2 AM |
269 | void *entry[0]; /* |
270 | * Must have this definition in here for the proper | |
271 | * alignment of array_cache. Also simplifies accessing | |
272 | * the entries. | |
273 | * [0] is for gcc 2.95. It should really be []. | |
274 | */ | |
1da177e4 LT |
275 | }; |
276 | ||
a737b3e2 AM |
277 | /* |
278 | * bootstrap: The caches do not work without cpuarrays anymore, but the | |
279 | * cpuarrays are allocated from the generic caches... | |
1da177e4 LT |
280 | */ |
281 | #define BOOT_CPUCACHE_ENTRIES 1 | |
282 | struct arraycache_init { | |
283 | struct array_cache cache; | |
b28a02de | 284 | void *entries[BOOT_CPUCACHE_ENTRIES]; |
1da177e4 LT |
285 | }; |
286 | ||
287 | /* | |
e498be7d | 288 | * The slab lists for all objects. |
1da177e4 LT |
289 | */ |
290 | struct kmem_list3 { | |
b28a02de PE |
291 | struct list_head slabs_partial; /* partial list first, better asm code */ |
292 | struct list_head slabs_full; | |
293 | struct list_head slabs_free; | |
294 | unsigned long free_objects; | |
b28a02de | 295 | unsigned int free_limit; |
2e1217cf | 296 | unsigned int colour_next; /* Per-node cache coloring */ |
b28a02de PE |
297 | spinlock_t list_lock; |
298 | struct array_cache *shared; /* shared per node */ | |
299 | struct array_cache **alien; /* on other nodes */ | |
35386e3b CL |
300 | unsigned long next_reap; /* updated without locking */ |
301 | int free_touched; /* updated without locking */ | |
1da177e4 LT |
302 | }; |
303 | ||
e498be7d CL |
304 | /* |
305 | * Need this for bootstrapping a per node allocator. | |
306 | */ | |
307 | #define NUM_INIT_LISTS (2 * MAX_NUMNODES + 1) | |
308 | struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS]; | |
309 | #define CACHE_CACHE 0 | |
310 | #define SIZE_AC 1 | |
311 | #define SIZE_L3 (1 + MAX_NUMNODES) | |
312 | ||
ed11d9eb CL |
313 | static int drain_freelist(struct kmem_cache *cache, |
314 | struct kmem_list3 *l3, int tofree); | |
315 | static void free_block(struct kmem_cache *cachep, void **objpp, int len, | |
316 | int node); | |
2ed3a4ef | 317 | static int enable_cpucache(struct kmem_cache *cachep); |
65f27f38 | 318 | static void cache_reap(struct work_struct *unused); |
ed11d9eb | 319 | |
e498be7d | 320 | /* |
a737b3e2 AM |
321 | * This function must be completely optimized away if a constant is passed to |
322 | * it. Mostly the same as what is in linux/slab.h except it returns an index. | |
e498be7d | 323 | */ |
7243cc05 | 324 | static __always_inline int index_of(const size_t size) |
e498be7d | 325 | { |
5ec8a847 SR |
326 | extern void __bad_size(void); |
327 | ||
e498be7d CL |
328 | if (__builtin_constant_p(size)) { |
329 | int i = 0; | |
330 | ||
331 | #define CACHE(x) \ | |
332 | if (size <=x) \ | |
333 | return i; \ | |
334 | else \ | |
335 | i++; | |
336 | #include "linux/kmalloc_sizes.h" | |
337 | #undef CACHE | |
5ec8a847 | 338 | __bad_size(); |
7243cc05 | 339 | } else |
5ec8a847 | 340 | __bad_size(); |
e498be7d CL |
341 | return 0; |
342 | } | |
343 | ||
e0a42726 IM |
344 | static int slab_early_init = 1; |
345 | ||
e498be7d CL |
346 | #define INDEX_AC index_of(sizeof(struct arraycache_init)) |
347 | #define INDEX_L3 index_of(sizeof(struct kmem_list3)) | |
1da177e4 | 348 | |
5295a74c | 349 | static void kmem_list3_init(struct kmem_list3 *parent) |
e498be7d CL |
350 | { |
351 | INIT_LIST_HEAD(&parent->slabs_full); | |
352 | INIT_LIST_HEAD(&parent->slabs_partial); | |
353 | INIT_LIST_HEAD(&parent->slabs_free); | |
354 | parent->shared = NULL; | |
355 | parent->alien = NULL; | |
2e1217cf | 356 | parent->colour_next = 0; |
e498be7d CL |
357 | spin_lock_init(&parent->list_lock); |
358 | parent->free_objects = 0; | |
359 | parent->free_touched = 0; | |
360 | } | |
361 | ||
a737b3e2 AM |
362 | #define MAKE_LIST(cachep, listp, slab, nodeid) \ |
363 | do { \ | |
364 | INIT_LIST_HEAD(listp); \ | |
365 | list_splice(&(cachep->nodelists[nodeid]->slab), listp); \ | |
e498be7d CL |
366 | } while (0) |
367 | ||
a737b3e2 AM |
368 | #define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ |
369 | do { \ | |
e498be7d CL |
370 | MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid); \ |
371 | MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \ | |
372 | MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \ | |
373 | } while (0) | |
1da177e4 LT |
374 | |
375 | /* | |
343e0d7a | 376 | * struct kmem_cache |
1da177e4 LT |
377 | * |
378 | * manages a cache. | |
379 | */ | |
b28a02de | 380 | |
2109a2d1 | 381 | struct kmem_cache { |
1da177e4 | 382 | /* 1) per-cpu data, touched during every alloc/free */ |
b28a02de | 383 | struct array_cache *array[NR_CPUS]; |
b5d8ca7c | 384 | /* 2) Cache tunables. Protected by cache_chain_mutex */ |
b28a02de PE |
385 | unsigned int batchcount; |
386 | unsigned int limit; | |
387 | unsigned int shared; | |
b5d8ca7c | 388 | |
3dafccf2 | 389 | unsigned int buffer_size; |
6a2d7a95 | 390 | u32 reciprocal_buffer_size; |
b5d8ca7c | 391 | /* 3) touched by every alloc & free from the backend */ |
b28a02de | 392 | struct kmem_list3 *nodelists[MAX_NUMNODES]; |
b5d8ca7c | 393 | |
a737b3e2 AM |
394 | unsigned int flags; /* constant flags */ |
395 | unsigned int num; /* # of objs per slab */ | |
1da177e4 | 396 | |
b5d8ca7c | 397 | /* 4) cache_grow/shrink */ |
1da177e4 | 398 | /* order of pgs per slab (2^n) */ |
b28a02de | 399 | unsigned int gfporder; |
1da177e4 LT |
400 | |
401 | /* force GFP flags, e.g. GFP_DMA */ | |
b28a02de | 402 | gfp_t gfpflags; |
1da177e4 | 403 | |
a737b3e2 | 404 | size_t colour; /* cache colouring range */ |
b28a02de | 405 | unsigned int colour_off; /* colour offset */ |
343e0d7a | 406 | struct kmem_cache *slabp_cache; |
b28a02de | 407 | unsigned int slab_size; |
a737b3e2 | 408 | unsigned int dflags; /* dynamic flags */ |
1da177e4 LT |
409 | |
410 | /* constructor func */ | |
343e0d7a | 411 | void (*ctor) (void *, struct kmem_cache *, unsigned long); |
1da177e4 LT |
412 | |
413 | /* de-constructor func */ | |
343e0d7a | 414 | void (*dtor) (void *, struct kmem_cache *, unsigned long); |
1da177e4 | 415 | |
b5d8ca7c | 416 | /* 5) cache creation/removal */ |
b28a02de PE |
417 | const char *name; |
418 | struct list_head next; | |
1da177e4 | 419 | |
b5d8ca7c | 420 | /* 6) statistics */ |
1da177e4 | 421 | #if STATS |
b28a02de PE |
422 | unsigned long num_active; |
423 | unsigned long num_allocations; | |
424 | unsigned long high_mark; | |
425 | unsigned long grown; | |
426 | unsigned long reaped; | |
427 | unsigned long errors; | |
428 | unsigned long max_freeable; | |
429 | unsigned long node_allocs; | |
430 | unsigned long node_frees; | |
fb7faf33 | 431 | unsigned long node_overflow; |
b28a02de PE |
432 | atomic_t allochit; |
433 | atomic_t allocmiss; | |
434 | atomic_t freehit; | |
435 | atomic_t freemiss; | |
1da177e4 LT |
436 | #endif |
437 | #if DEBUG | |
3dafccf2 MS |
438 | /* |
439 | * If debugging is enabled, then the allocator can add additional | |
440 | * fields and/or padding to every object. buffer_size contains the total | |
441 | * object size including these internal fields, the following two | |
442 | * variables contain the offset to the user object and its size. | |
443 | */ | |
444 | int obj_offset; | |
445 | int obj_size; | |
1da177e4 LT |
446 | #endif |
447 | }; | |
448 | ||
449 | #define CFLGS_OFF_SLAB (0x80000000UL) | |
450 | #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) | |
451 | ||
452 | #define BATCHREFILL_LIMIT 16 | |
a737b3e2 AM |
453 | /* |
454 | * Optimization question: fewer reaps means less probability for unnessary | |
455 | * cpucache drain/refill cycles. | |
1da177e4 | 456 | * |
dc6f3f27 | 457 | * OTOH the cpuarrays can contain lots of objects, |
1da177e4 LT |
458 | * which could lock up otherwise freeable slabs. |
459 | */ | |
460 | #define REAPTIMEOUT_CPUC (2*HZ) | |
461 | #define REAPTIMEOUT_LIST3 (4*HZ) | |
462 | ||
463 | #if STATS | |
464 | #define STATS_INC_ACTIVE(x) ((x)->num_active++) | |
465 | #define STATS_DEC_ACTIVE(x) ((x)->num_active--) | |
466 | #define STATS_INC_ALLOCED(x) ((x)->num_allocations++) | |
467 | #define STATS_INC_GROWN(x) ((x)->grown++) | |
ed11d9eb | 468 | #define STATS_ADD_REAPED(x,y) ((x)->reaped += (y)) |
a737b3e2 AM |
469 | #define STATS_SET_HIGH(x) \ |
470 | do { \ | |
471 | if ((x)->num_active > (x)->high_mark) \ | |
472 | (x)->high_mark = (x)->num_active; \ | |
473 | } while (0) | |
1da177e4 LT |
474 | #define STATS_INC_ERR(x) ((x)->errors++) |
475 | #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++) | |
e498be7d | 476 | #define STATS_INC_NODEFREES(x) ((x)->node_frees++) |
fb7faf33 | 477 | #define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++) |
a737b3e2 AM |
478 | #define STATS_SET_FREEABLE(x, i) \ |
479 | do { \ | |
480 | if ((x)->max_freeable < i) \ | |
481 | (x)->max_freeable = i; \ | |
482 | } while (0) | |
1da177e4 LT |
483 | #define STATS_INC_ALLOCHIT(x) atomic_inc(&(x)->allochit) |
484 | #define STATS_INC_ALLOCMISS(x) atomic_inc(&(x)->allocmiss) | |
485 | #define STATS_INC_FREEHIT(x) atomic_inc(&(x)->freehit) | |
486 | #define STATS_INC_FREEMISS(x) atomic_inc(&(x)->freemiss) | |
487 | #else | |
488 | #define STATS_INC_ACTIVE(x) do { } while (0) | |
489 | #define STATS_DEC_ACTIVE(x) do { } while (0) | |
490 | #define STATS_INC_ALLOCED(x) do { } while (0) | |
491 | #define STATS_INC_GROWN(x) do { } while (0) | |
ed11d9eb | 492 | #define STATS_ADD_REAPED(x,y) do { } while (0) |
1da177e4 LT |
493 | #define STATS_SET_HIGH(x) do { } while (0) |
494 | #define STATS_INC_ERR(x) do { } while (0) | |
495 | #define STATS_INC_NODEALLOCS(x) do { } while (0) | |
e498be7d | 496 | #define STATS_INC_NODEFREES(x) do { } while (0) |
fb7faf33 | 497 | #define STATS_INC_ACOVERFLOW(x) do { } while (0) |
a737b3e2 | 498 | #define STATS_SET_FREEABLE(x, i) do { } while (0) |
1da177e4 LT |
499 | #define STATS_INC_ALLOCHIT(x) do { } while (0) |
500 | #define STATS_INC_ALLOCMISS(x) do { } while (0) | |
501 | #define STATS_INC_FREEHIT(x) do { } while (0) | |
502 | #define STATS_INC_FREEMISS(x) do { } while (0) | |
503 | #endif | |
504 | ||
505 | #if DEBUG | |
1da177e4 | 506 | |
a737b3e2 AM |
507 | /* |
508 | * memory layout of objects: | |
1da177e4 | 509 | * 0 : objp |
3dafccf2 | 510 | * 0 .. cachep->obj_offset - BYTES_PER_WORD - 1: padding. This ensures that |
1da177e4 LT |
511 | * the end of an object is aligned with the end of the real |
512 | * allocation. Catches writes behind the end of the allocation. | |
3dafccf2 | 513 | * cachep->obj_offset - BYTES_PER_WORD .. cachep->obj_offset - 1: |
1da177e4 | 514 | * redzone word. |
3dafccf2 MS |
515 | * cachep->obj_offset: The real object. |
516 | * cachep->buffer_size - 2* BYTES_PER_WORD: redzone word [BYTES_PER_WORD long] | |
a737b3e2 AM |
517 | * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address |
518 | * [BYTES_PER_WORD long] | |
1da177e4 | 519 | */ |
343e0d7a | 520 | static int obj_offset(struct kmem_cache *cachep) |
1da177e4 | 521 | { |
3dafccf2 | 522 | return cachep->obj_offset; |
1da177e4 LT |
523 | } |
524 | ||
343e0d7a | 525 | static int obj_size(struct kmem_cache *cachep) |
1da177e4 | 526 | { |
3dafccf2 | 527 | return cachep->obj_size; |
1da177e4 LT |
528 | } |
529 | ||
343e0d7a | 530 | static unsigned long *dbg_redzone1(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
531 | { |
532 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
3dafccf2 | 533 | return (unsigned long*) (objp+obj_offset(cachep)-BYTES_PER_WORD); |
1da177e4 LT |
534 | } |
535 | ||
343e0d7a | 536 | static unsigned long *dbg_redzone2(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
537 | { |
538 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
539 | if (cachep->flags & SLAB_STORE_USER) | |
3dafccf2 | 540 | return (unsigned long *)(objp + cachep->buffer_size - |
b28a02de | 541 | 2 * BYTES_PER_WORD); |
3dafccf2 | 542 | return (unsigned long *)(objp + cachep->buffer_size - BYTES_PER_WORD); |
1da177e4 LT |
543 | } |
544 | ||
343e0d7a | 545 | static void **dbg_userword(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
546 | { |
547 | BUG_ON(!(cachep->flags & SLAB_STORE_USER)); | |
3dafccf2 | 548 | return (void **)(objp + cachep->buffer_size - BYTES_PER_WORD); |
1da177e4 LT |
549 | } |
550 | ||
551 | #else | |
552 | ||
3dafccf2 MS |
553 | #define obj_offset(x) 0 |
554 | #define obj_size(cachep) (cachep->buffer_size) | |
1da177e4 LT |
555 | #define dbg_redzone1(cachep, objp) ({BUG(); (unsigned long *)NULL;}) |
556 | #define dbg_redzone2(cachep, objp) ({BUG(); (unsigned long *)NULL;}) | |
557 | #define dbg_userword(cachep, objp) ({BUG(); (void **)NULL;}) | |
558 | ||
559 | #endif | |
560 | ||
561 | /* | |
a737b3e2 AM |
562 | * Maximum size of an obj (in 2^order pages) and absolute limit for the gfp |
563 | * order. | |
1da177e4 LT |
564 | */ |
565 | #if defined(CONFIG_LARGE_ALLOCS) | |
566 | #define MAX_OBJ_ORDER 13 /* up to 32Mb */ | |
567 | #define MAX_GFP_ORDER 13 /* up to 32Mb */ | |
568 | #elif defined(CONFIG_MMU) | |
569 | #define MAX_OBJ_ORDER 5 /* 32 pages */ | |
570 | #define MAX_GFP_ORDER 5 /* 32 pages */ | |
571 | #else | |
572 | #define MAX_OBJ_ORDER 8 /* up to 1Mb */ | |
573 | #define MAX_GFP_ORDER 8 /* up to 1Mb */ | |
574 | #endif | |
575 | ||
576 | /* | |
577 | * Do not go above this order unless 0 objects fit into the slab. | |
578 | */ | |
579 | #define BREAK_GFP_ORDER_HI 1 | |
580 | #define BREAK_GFP_ORDER_LO 0 | |
581 | static int slab_break_gfp_order = BREAK_GFP_ORDER_LO; | |
582 | ||
a737b3e2 AM |
583 | /* |
584 | * Functions for storing/retrieving the cachep and or slab from the page | |
585 | * allocator. These are used to find the slab an obj belongs to. With kfree(), | |
586 | * these are used to find the cache which an obj belongs to. | |
1da177e4 | 587 | */ |
065d41cb PE |
588 | static inline void page_set_cache(struct page *page, struct kmem_cache *cache) |
589 | { | |
590 | page->lru.next = (struct list_head *)cache; | |
591 | } | |
592 | ||
593 | static inline struct kmem_cache *page_get_cache(struct page *page) | |
594 | { | |
84097518 NP |
595 | if (unlikely(PageCompound(page))) |
596 | page = (struct page *)page_private(page); | |
ddc2e812 | 597 | BUG_ON(!PageSlab(page)); |
065d41cb PE |
598 | return (struct kmem_cache *)page->lru.next; |
599 | } | |
600 | ||
601 | static inline void page_set_slab(struct page *page, struct slab *slab) | |
602 | { | |
603 | page->lru.prev = (struct list_head *)slab; | |
604 | } | |
605 | ||
606 | static inline struct slab *page_get_slab(struct page *page) | |
607 | { | |
84097518 NP |
608 | if (unlikely(PageCompound(page))) |
609 | page = (struct page *)page_private(page); | |
ddc2e812 | 610 | BUG_ON(!PageSlab(page)); |
065d41cb PE |
611 | return (struct slab *)page->lru.prev; |
612 | } | |
1da177e4 | 613 | |
6ed5eb22 PE |
614 | static inline struct kmem_cache *virt_to_cache(const void *obj) |
615 | { | |
616 | struct page *page = virt_to_page(obj); | |
617 | return page_get_cache(page); | |
618 | } | |
619 | ||
620 | static inline struct slab *virt_to_slab(const void *obj) | |
621 | { | |
622 | struct page *page = virt_to_page(obj); | |
623 | return page_get_slab(page); | |
624 | } | |
625 | ||
8fea4e96 PE |
626 | static inline void *index_to_obj(struct kmem_cache *cache, struct slab *slab, |
627 | unsigned int idx) | |
628 | { | |
629 | return slab->s_mem + cache->buffer_size * idx; | |
630 | } | |
631 | ||
6a2d7a95 ED |
632 | /* |
633 | * We want to avoid an expensive divide : (offset / cache->buffer_size) | |
634 | * Using the fact that buffer_size is a constant for a particular cache, | |
635 | * we can replace (offset / cache->buffer_size) by | |
636 | * reciprocal_divide(offset, cache->reciprocal_buffer_size) | |
637 | */ | |
638 | static inline unsigned int obj_to_index(const struct kmem_cache *cache, | |
639 | const struct slab *slab, void *obj) | |
8fea4e96 | 640 | { |
6a2d7a95 ED |
641 | u32 offset = (obj - slab->s_mem); |
642 | return reciprocal_divide(offset, cache->reciprocal_buffer_size); | |
8fea4e96 PE |
643 | } |
644 | ||
a737b3e2 AM |
645 | /* |
646 | * These are the default caches for kmalloc. Custom caches can have other sizes. | |
647 | */ | |
1da177e4 LT |
648 | struct cache_sizes malloc_sizes[] = { |
649 | #define CACHE(x) { .cs_size = (x) }, | |
650 | #include <linux/kmalloc_sizes.h> | |
651 | CACHE(ULONG_MAX) | |
652 | #undef CACHE | |
653 | }; | |
654 | EXPORT_SYMBOL(malloc_sizes); | |
655 | ||
656 | /* Must match cache_sizes above. Out of line to keep cache footprint low. */ | |
657 | struct cache_names { | |
658 | char *name; | |
659 | char *name_dma; | |
660 | }; | |
661 | ||
662 | static struct cache_names __initdata cache_names[] = { | |
663 | #define CACHE(x) { .name = "size-" #x, .name_dma = "size-" #x "(DMA)" }, | |
664 | #include <linux/kmalloc_sizes.h> | |
b28a02de | 665 | {NULL,} |
1da177e4 LT |
666 | #undef CACHE |
667 | }; | |
668 | ||
669 | static struct arraycache_init initarray_cache __initdata = | |
b28a02de | 670 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 | 671 | static struct arraycache_init initarray_generic = |
b28a02de | 672 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 LT |
673 | |
674 | /* internal cache of cache description objs */ | |
343e0d7a | 675 | static struct kmem_cache cache_cache = { |
b28a02de PE |
676 | .batchcount = 1, |
677 | .limit = BOOT_CPUCACHE_ENTRIES, | |
678 | .shared = 1, | |
343e0d7a | 679 | .buffer_size = sizeof(struct kmem_cache), |
b28a02de | 680 | .name = "kmem_cache", |
1da177e4 | 681 | #if DEBUG |
343e0d7a | 682 | .obj_size = sizeof(struct kmem_cache), |
1da177e4 LT |
683 | #endif |
684 | }; | |
685 | ||
056c6241 RT |
686 | #define BAD_ALIEN_MAGIC 0x01020304ul |
687 | ||
f1aaee53 AV |
688 | #ifdef CONFIG_LOCKDEP |
689 | ||
690 | /* | |
691 | * Slab sometimes uses the kmalloc slabs to store the slab headers | |
692 | * for other slabs "off slab". | |
693 | * The locking for this is tricky in that it nests within the locks | |
694 | * of all other slabs in a few places; to deal with this special | |
695 | * locking we put on-slab caches into a separate lock-class. | |
056c6241 RT |
696 | * |
697 | * We set lock class for alien array caches which are up during init. | |
698 | * The lock annotation will be lost if all cpus of a node goes down and | |
699 | * then comes back up during hotplug | |
f1aaee53 | 700 | */ |
056c6241 RT |
701 | static struct lock_class_key on_slab_l3_key; |
702 | static struct lock_class_key on_slab_alc_key; | |
703 | ||
704 | static inline void init_lock_keys(void) | |
f1aaee53 | 705 | |
f1aaee53 AV |
706 | { |
707 | int q; | |
056c6241 RT |
708 | struct cache_sizes *s = malloc_sizes; |
709 | ||
710 | while (s->cs_size != ULONG_MAX) { | |
711 | for_each_node(q) { | |
712 | struct array_cache **alc; | |
713 | int r; | |
714 | struct kmem_list3 *l3 = s->cs_cachep->nodelists[q]; | |
715 | if (!l3 || OFF_SLAB(s->cs_cachep)) | |
716 | continue; | |
717 | lockdep_set_class(&l3->list_lock, &on_slab_l3_key); | |
718 | alc = l3->alien; | |
719 | /* | |
720 | * FIXME: This check for BAD_ALIEN_MAGIC | |
721 | * should go away when common slab code is taught to | |
722 | * work even without alien caches. | |
723 | * Currently, non NUMA code returns BAD_ALIEN_MAGIC | |
724 | * for alloc_alien_cache, | |
725 | */ | |
726 | if (!alc || (unsigned long)alc == BAD_ALIEN_MAGIC) | |
727 | continue; | |
728 | for_each_node(r) { | |
729 | if (alc[r]) | |
730 | lockdep_set_class(&alc[r]->lock, | |
731 | &on_slab_alc_key); | |
732 | } | |
733 | } | |
734 | s++; | |
f1aaee53 AV |
735 | } |
736 | } | |
f1aaee53 | 737 | #else |
056c6241 | 738 | static inline void init_lock_keys(void) |
f1aaee53 AV |
739 | { |
740 | } | |
741 | #endif | |
742 | ||
8f5be20b RT |
743 | /* |
744 | * 1. Guard access to the cache-chain. | |
745 | * 2. Protect sanity of cpu_online_map against cpu hotplug events | |
746 | */ | |
fc0abb14 | 747 | static DEFINE_MUTEX(cache_chain_mutex); |
1da177e4 LT |
748 | static struct list_head cache_chain; |
749 | ||
1da177e4 LT |
750 | /* |
751 | * chicken and egg problem: delay the per-cpu array allocation | |
752 | * until the general caches are up. | |
753 | */ | |
754 | static enum { | |
755 | NONE, | |
e498be7d CL |
756 | PARTIAL_AC, |
757 | PARTIAL_L3, | |
1da177e4 LT |
758 | FULL |
759 | } g_cpucache_up; | |
760 | ||
39d24e64 MK |
761 | /* |
762 | * used by boot code to determine if it can use slab based allocator | |
763 | */ | |
764 | int slab_is_available(void) | |
765 | { | |
766 | return g_cpucache_up == FULL; | |
767 | } | |
768 | ||
52bad64d | 769 | static DEFINE_PER_CPU(struct delayed_work, reap_work); |
1da177e4 | 770 | |
343e0d7a | 771 | static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) |
1da177e4 LT |
772 | { |
773 | return cachep->array[smp_processor_id()]; | |
774 | } | |
775 | ||
a737b3e2 AM |
776 | static inline struct kmem_cache *__find_general_cachep(size_t size, |
777 | gfp_t gfpflags) | |
1da177e4 LT |
778 | { |
779 | struct cache_sizes *csizep = malloc_sizes; | |
780 | ||
781 | #if DEBUG | |
782 | /* This happens if someone tries to call | |
b28a02de PE |
783 | * kmem_cache_create(), or __kmalloc(), before |
784 | * the generic caches are initialized. | |
785 | */ | |
c7e43c78 | 786 | BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL); |
1da177e4 LT |
787 | #endif |
788 | while (size > csizep->cs_size) | |
789 | csizep++; | |
790 | ||
791 | /* | |
0abf40c1 | 792 | * Really subtle: The last entry with cs->cs_size==ULONG_MAX |
1da177e4 LT |
793 | * has cs_{dma,}cachep==NULL. Thus no special case |
794 | * for large kmalloc calls required. | |
795 | */ | |
4b51d669 | 796 | #ifdef CONFIG_ZONE_DMA |
1da177e4 LT |
797 | if (unlikely(gfpflags & GFP_DMA)) |
798 | return csizep->cs_dmacachep; | |
4b51d669 | 799 | #endif |
1da177e4 LT |
800 | return csizep->cs_cachep; |
801 | } | |
802 | ||
b221385b | 803 | static struct kmem_cache *kmem_find_general_cachep(size_t size, gfp_t gfpflags) |
97e2bde4 MS |
804 | { |
805 | return __find_general_cachep(size, gfpflags); | |
806 | } | |
97e2bde4 | 807 | |
fbaccacf | 808 | static size_t slab_mgmt_size(size_t nr_objs, size_t align) |
1da177e4 | 809 | { |
fbaccacf SR |
810 | return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align); |
811 | } | |
1da177e4 | 812 | |
a737b3e2 AM |
813 | /* |
814 | * Calculate the number of objects and left-over bytes for a given buffer size. | |
815 | */ | |
fbaccacf SR |
816 | static void cache_estimate(unsigned long gfporder, size_t buffer_size, |
817 | size_t align, int flags, size_t *left_over, | |
818 | unsigned int *num) | |
819 | { | |
820 | int nr_objs; | |
821 | size_t mgmt_size; | |
822 | size_t slab_size = PAGE_SIZE << gfporder; | |
1da177e4 | 823 | |
fbaccacf SR |
824 | /* |
825 | * The slab management structure can be either off the slab or | |
826 | * on it. For the latter case, the memory allocated for a | |
827 | * slab is used for: | |
828 | * | |
829 | * - The struct slab | |
830 | * - One kmem_bufctl_t for each object | |
831 | * - Padding to respect alignment of @align | |
832 | * - @buffer_size bytes for each object | |
833 | * | |
834 | * If the slab management structure is off the slab, then the | |
835 | * alignment will already be calculated into the size. Because | |
836 | * the slabs are all pages aligned, the objects will be at the | |
837 | * correct alignment when allocated. | |
838 | */ | |
839 | if (flags & CFLGS_OFF_SLAB) { | |
840 | mgmt_size = 0; | |
841 | nr_objs = slab_size / buffer_size; | |
842 | ||
843 | if (nr_objs > SLAB_LIMIT) | |
844 | nr_objs = SLAB_LIMIT; | |
845 | } else { | |
846 | /* | |
847 | * Ignore padding for the initial guess. The padding | |
848 | * is at most @align-1 bytes, and @buffer_size is at | |
849 | * least @align. In the worst case, this result will | |
850 | * be one greater than the number of objects that fit | |
851 | * into the memory allocation when taking the padding | |
852 | * into account. | |
853 | */ | |
854 | nr_objs = (slab_size - sizeof(struct slab)) / | |
855 | (buffer_size + sizeof(kmem_bufctl_t)); | |
856 | ||
857 | /* | |
858 | * This calculated number will be either the right | |
859 | * amount, or one greater than what we want. | |
860 | */ | |
861 | if (slab_mgmt_size(nr_objs, align) + nr_objs*buffer_size | |
862 | > slab_size) | |
863 | nr_objs--; | |
864 | ||
865 | if (nr_objs > SLAB_LIMIT) | |
866 | nr_objs = SLAB_LIMIT; | |
867 | ||
868 | mgmt_size = slab_mgmt_size(nr_objs, align); | |
869 | } | |
870 | *num = nr_objs; | |
871 | *left_over = slab_size - nr_objs*buffer_size - mgmt_size; | |
1da177e4 LT |
872 | } |
873 | ||
874 | #define slab_error(cachep, msg) __slab_error(__FUNCTION__, cachep, msg) | |
875 | ||
a737b3e2 AM |
876 | static void __slab_error(const char *function, struct kmem_cache *cachep, |
877 | char *msg) | |
1da177e4 LT |
878 | { |
879 | printk(KERN_ERR "slab error in %s(): cache `%s': %s\n", | |
b28a02de | 880 | function, cachep->name, msg); |
1da177e4 LT |
881 | dump_stack(); |
882 | } | |
883 | ||
3395ee05 PM |
884 | /* |
885 | * By default on NUMA we use alien caches to stage the freeing of | |
886 | * objects allocated from other nodes. This causes massive memory | |
887 | * inefficiencies when using fake NUMA setup to split memory into a | |
888 | * large number of small nodes, so it can be disabled on the command | |
889 | * line | |
890 | */ | |
891 | ||
892 | static int use_alien_caches __read_mostly = 1; | |
893 | static int __init noaliencache_setup(char *s) | |
894 | { | |
895 | use_alien_caches = 0; | |
896 | return 1; | |
897 | } | |
898 | __setup("noaliencache", noaliencache_setup); | |
899 | ||
8fce4d8e CL |
900 | #ifdef CONFIG_NUMA |
901 | /* | |
902 | * Special reaping functions for NUMA systems called from cache_reap(). | |
903 | * These take care of doing round robin flushing of alien caches (containing | |
904 | * objects freed on different nodes from which they were allocated) and the | |
905 | * flushing of remote pcps by calling drain_node_pages. | |
906 | */ | |
907 | static DEFINE_PER_CPU(unsigned long, reap_node); | |
908 | ||
909 | static void init_reap_node(int cpu) | |
910 | { | |
911 | int node; | |
912 | ||
913 | node = next_node(cpu_to_node(cpu), node_online_map); | |
914 | if (node == MAX_NUMNODES) | |
442295c9 | 915 | node = first_node(node_online_map); |
8fce4d8e | 916 | |
7f6b8876 | 917 | per_cpu(reap_node, cpu) = node; |
8fce4d8e CL |
918 | } |
919 | ||
920 | static void next_reap_node(void) | |
921 | { | |
922 | int node = __get_cpu_var(reap_node); | |
923 | ||
924 | /* | |
925 | * Also drain per cpu pages on remote zones | |
926 | */ | |
927 | if (node != numa_node_id()) | |
928 | drain_node_pages(node); | |
929 | ||
930 | node = next_node(node, node_online_map); | |
931 | if (unlikely(node >= MAX_NUMNODES)) | |
932 | node = first_node(node_online_map); | |
933 | __get_cpu_var(reap_node) = node; | |
934 | } | |
935 | ||
936 | #else | |
937 | #define init_reap_node(cpu) do { } while (0) | |
938 | #define next_reap_node(void) do { } while (0) | |
939 | #endif | |
940 | ||
1da177e4 LT |
941 | /* |
942 | * Initiate the reap timer running on the target CPU. We run at around 1 to 2Hz | |
943 | * via the workqueue/eventd. | |
944 | * Add the CPU number into the expiration time to minimize the possibility of | |
945 | * the CPUs getting into lockstep and contending for the global cache chain | |
946 | * lock. | |
947 | */ | |
948 | static void __devinit start_cpu_timer(int cpu) | |
949 | { | |
52bad64d | 950 | struct delayed_work *reap_work = &per_cpu(reap_work, cpu); |
1da177e4 LT |
951 | |
952 | /* | |
953 | * When this gets called from do_initcalls via cpucache_init(), | |
954 | * init_workqueues() has already run, so keventd will be setup | |
955 | * at that time. | |
956 | */ | |
52bad64d | 957 | if (keventd_up() && reap_work->work.func == NULL) { |
8fce4d8e | 958 | init_reap_node(cpu); |
65f27f38 | 959 | INIT_DELAYED_WORK(reap_work, cache_reap); |
2b284214 AV |
960 | schedule_delayed_work_on(cpu, reap_work, |
961 | __round_jiffies_relative(HZ, cpu)); | |
1da177e4 LT |
962 | } |
963 | } | |
964 | ||
e498be7d | 965 | static struct array_cache *alloc_arraycache(int node, int entries, |
b28a02de | 966 | int batchcount) |
1da177e4 | 967 | { |
b28a02de | 968 | int memsize = sizeof(void *) * entries + sizeof(struct array_cache); |
1da177e4 LT |
969 | struct array_cache *nc = NULL; |
970 | ||
e498be7d | 971 | nc = kmalloc_node(memsize, GFP_KERNEL, node); |
1da177e4 LT |
972 | if (nc) { |
973 | nc->avail = 0; | |
974 | nc->limit = entries; | |
975 | nc->batchcount = batchcount; | |
976 | nc->touched = 0; | |
e498be7d | 977 | spin_lock_init(&nc->lock); |
1da177e4 LT |
978 | } |
979 | return nc; | |
980 | } | |
981 | ||
3ded175a CL |
982 | /* |
983 | * Transfer objects in one arraycache to another. | |
984 | * Locking must be handled by the caller. | |
985 | * | |
986 | * Return the number of entries transferred. | |
987 | */ | |
988 | static int transfer_objects(struct array_cache *to, | |
989 | struct array_cache *from, unsigned int max) | |
990 | { | |
991 | /* Figure out how many entries to transfer */ | |
992 | int nr = min(min(from->avail, max), to->limit - to->avail); | |
993 | ||
994 | if (!nr) | |
995 | return 0; | |
996 | ||
997 | memcpy(to->entry + to->avail, from->entry + from->avail -nr, | |
998 | sizeof(void *) *nr); | |
999 | ||
1000 | from->avail -= nr; | |
1001 | to->avail += nr; | |
1002 | to->touched = 1; | |
1003 | return nr; | |
1004 | } | |
1005 | ||
765c4507 CL |
1006 | #ifndef CONFIG_NUMA |
1007 | ||
1008 | #define drain_alien_cache(cachep, alien) do { } while (0) | |
1009 | #define reap_alien(cachep, l3) do { } while (0) | |
1010 | ||
1011 | static inline struct array_cache **alloc_alien_cache(int node, int limit) | |
1012 | { | |
1013 | return (struct array_cache **)BAD_ALIEN_MAGIC; | |
1014 | } | |
1015 | ||
1016 | static inline void free_alien_cache(struct array_cache **ac_ptr) | |
1017 | { | |
1018 | } | |
1019 | ||
1020 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) | |
1021 | { | |
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | static inline void *alternate_node_alloc(struct kmem_cache *cachep, | |
1026 | gfp_t flags) | |
1027 | { | |
1028 | return NULL; | |
1029 | } | |
1030 | ||
8b98c169 | 1031 | static inline void *____cache_alloc_node(struct kmem_cache *cachep, |
765c4507 CL |
1032 | gfp_t flags, int nodeid) |
1033 | { | |
1034 | return NULL; | |
1035 | } | |
1036 | ||
1037 | #else /* CONFIG_NUMA */ | |
1038 | ||
8b98c169 | 1039 | static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int); |
c61afb18 | 1040 | static void *alternate_node_alloc(struct kmem_cache *, gfp_t); |
dc85da15 | 1041 | |
5295a74c | 1042 | static struct array_cache **alloc_alien_cache(int node, int limit) |
e498be7d CL |
1043 | { |
1044 | struct array_cache **ac_ptr; | |
b28a02de | 1045 | int memsize = sizeof(void *) * MAX_NUMNODES; |
e498be7d CL |
1046 | int i; |
1047 | ||
1048 | if (limit > 1) | |
1049 | limit = 12; | |
1050 | ac_ptr = kmalloc_node(memsize, GFP_KERNEL, node); | |
1051 | if (ac_ptr) { | |
1052 | for_each_node(i) { | |
1053 | if (i == node || !node_online(i)) { | |
1054 | ac_ptr[i] = NULL; | |
1055 | continue; | |
1056 | } | |
1057 | ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d); | |
1058 | if (!ac_ptr[i]) { | |
b28a02de | 1059 | for (i--; i <= 0; i--) |
e498be7d CL |
1060 | kfree(ac_ptr[i]); |
1061 | kfree(ac_ptr); | |
1062 | return NULL; | |
1063 | } | |
1064 | } | |
1065 | } | |
1066 | return ac_ptr; | |
1067 | } | |
1068 | ||
5295a74c | 1069 | static void free_alien_cache(struct array_cache **ac_ptr) |
e498be7d CL |
1070 | { |
1071 | int i; | |
1072 | ||
1073 | if (!ac_ptr) | |
1074 | return; | |
e498be7d | 1075 | for_each_node(i) |
b28a02de | 1076 | kfree(ac_ptr[i]); |
e498be7d CL |
1077 | kfree(ac_ptr); |
1078 | } | |
1079 | ||
343e0d7a | 1080 | static void __drain_alien_cache(struct kmem_cache *cachep, |
5295a74c | 1081 | struct array_cache *ac, int node) |
e498be7d CL |
1082 | { |
1083 | struct kmem_list3 *rl3 = cachep->nodelists[node]; | |
1084 | ||
1085 | if (ac->avail) { | |
1086 | spin_lock(&rl3->list_lock); | |
e00946fe CL |
1087 | /* |
1088 | * Stuff objects into the remote nodes shared array first. | |
1089 | * That way we could avoid the overhead of putting the objects | |
1090 | * into the free lists and getting them back later. | |
1091 | */ | |
693f7d36 JS |
1092 | if (rl3->shared) |
1093 | transfer_objects(rl3->shared, ac, ac->limit); | |
e00946fe | 1094 | |
ff69416e | 1095 | free_block(cachep, ac->entry, ac->avail, node); |
e498be7d CL |
1096 | ac->avail = 0; |
1097 | spin_unlock(&rl3->list_lock); | |
1098 | } | |
1099 | } | |
1100 | ||
8fce4d8e CL |
1101 | /* |
1102 | * Called from cache_reap() to regularly drain alien caches round robin. | |
1103 | */ | |
1104 | static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3) | |
1105 | { | |
1106 | int node = __get_cpu_var(reap_node); | |
1107 | ||
1108 | if (l3->alien) { | |
1109 | struct array_cache *ac = l3->alien[node]; | |
e00946fe CL |
1110 | |
1111 | if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { | |
8fce4d8e CL |
1112 | __drain_alien_cache(cachep, ac, node); |
1113 | spin_unlock_irq(&ac->lock); | |
1114 | } | |
1115 | } | |
1116 | } | |
1117 | ||
a737b3e2 AM |
1118 | static void drain_alien_cache(struct kmem_cache *cachep, |
1119 | struct array_cache **alien) | |
e498be7d | 1120 | { |
b28a02de | 1121 | int i = 0; |
e498be7d CL |
1122 | struct array_cache *ac; |
1123 | unsigned long flags; | |
1124 | ||
1125 | for_each_online_node(i) { | |
4484ebf1 | 1126 | ac = alien[i]; |
e498be7d CL |
1127 | if (ac) { |
1128 | spin_lock_irqsave(&ac->lock, flags); | |
1129 | __drain_alien_cache(cachep, ac, i); | |
1130 | spin_unlock_irqrestore(&ac->lock, flags); | |
1131 | } | |
1132 | } | |
1133 | } | |
729bd0b7 | 1134 | |
873623df | 1135 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) |
729bd0b7 PE |
1136 | { |
1137 | struct slab *slabp = virt_to_slab(objp); | |
1138 | int nodeid = slabp->nodeid; | |
1139 | struct kmem_list3 *l3; | |
1140 | struct array_cache *alien = NULL; | |
1ca4cb24 PE |
1141 | int node; |
1142 | ||
1143 | node = numa_node_id(); | |
729bd0b7 PE |
1144 | |
1145 | /* | |
1146 | * Make sure we are not freeing a object from another node to the array | |
1147 | * cache on this cpu. | |
1148 | */ | |
3395ee05 | 1149 | if (likely(slabp->nodeid == node) || unlikely(!use_alien_caches)) |
729bd0b7 PE |
1150 | return 0; |
1151 | ||
1ca4cb24 | 1152 | l3 = cachep->nodelists[node]; |
729bd0b7 PE |
1153 | STATS_INC_NODEFREES(cachep); |
1154 | if (l3->alien && l3->alien[nodeid]) { | |
1155 | alien = l3->alien[nodeid]; | |
873623df | 1156 | spin_lock(&alien->lock); |
729bd0b7 PE |
1157 | if (unlikely(alien->avail == alien->limit)) { |
1158 | STATS_INC_ACOVERFLOW(cachep); | |
1159 | __drain_alien_cache(cachep, alien, nodeid); | |
1160 | } | |
1161 | alien->entry[alien->avail++] = objp; | |
1162 | spin_unlock(&alien->lock); | |
1163 | } else { | |
1164 | spin_lock(&(cachep->nodelists[nodeid])->list_lock); | |
1165 | free_block(cachep, &objp, 1, nodeid); | |
1166 | spin_unlock(&(cachep->nodelists[nodeid])->list_lock); | |
1167 | } | |
1168 | return 1; | |
1169 | } | |
e498be7d CL |
1170 | #endif |
1171 | ||
8c78f307 | 1172 | static int __cpuinit cpuup_callback(struct notifier_block *nfb, |
b28a02de | 1173 | unsigned long action, void *hcpu) |
1da177e4 LT |
1174 | { |
1175 | long cpu = (long)hcpu; | |
343e0d7a | 1176 | struct kmem_cache *cachep; |
e498be7d CL |
1177 | struct kmem_list3 *l3 = NULL; |
1178 | int node = cpu_to_node(cpu); | |
1179 | int memsize = sizeof(struct kmem_list3); | |
1da177e4 LT |
1180 | |
1181 | switch (action) { | |
1182 | case CPU_UP_PREPARE: | |
fc0abb14 | 1183 | mutex_lock(&cache_chain_mutex); |
a737b3e2 AM |
1184 | /* |
1185 | * We need to do this right in the beginning since | |
e498be7d CL |
1186 | * alloc_arraycache's are going to use this list. |
1187 | * kmalloc_node allows us to add the slab to the right | |
1188 | * kmem_list3 and not this cpu's kmem_list3 | |
1189 | */ | |
1190 | ||
1da177e4 | 1191 | list_for_each_entry(cachep, &cache_chain, next) { |
a737b3e2 AM |
1192 | /* |
1193 | * Set up the size64 kmemlist for cpu before we can | |
e498be7d CL |
1194 | * begin anything. Make sure some other cpu on this |
1195 | * node has not already allocated this | |
1196 | */ | |
1197 | if (!cachep->nodelists[node]) { | |
a737b3e2 AM |
1198 | l3 = kmalloc_node(memsize, GFP_KERNEL, node); |
1199 | if (!l3) | |
e498be7d CL |
1200 | goto bad; |
1201 | kmem_list3_init(l3); | |
1202 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
b28a02de | 1203 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
e498be7d | 1204 | |
4484ebf1 RT |
1205 | /* |
1206 | * The l3s don't come and go as CPUs come and | |
1207 | * go. cache_chain_mutex is sufficient | |
1208 | * protection here. | |
1209 | */ | |
e498be7d CL |
1210 | cachep->nodelists[node] = l3; |
1211 | } | |
1da177e4 | 1212 | |
e498be7d CL |
1213 | spin_lock_irq(&cachep->nodelists[node]->list_lock); |
1214 | cachep->nodelists[node]->free_limit = | |
a737b3e2 AM |
1215 | (1 + nr_cpus_node(node)) * |
1216 | cachep->batchcount + cachep->num; | |
e498be7d CL |
1217 | spin_unlock_irq(&cachep->nodelists[node]->list_lock); |
1218 | } | |
1219 | ||
a737b3e2 AM |
1220 | /* |
1221 | * Now we can go ahead with allocating the shared arrays and | |
1222 | * array caches | |
1223 | */ | |
e498be7d | 1224 | list_for_each_entry(cachep, &cache_chain, next) { |
cd105df4 | 1225 | struct array_cache *nc; |
4484ebf1 | 1226 | struct array_cache *shared; |
3395ee05 | 1227 | struct array_cache **alien = NULL; |
cd105df4 | 1228 | |
e498be7d | 1229 | nc = alloc_arraycache(node, cachep->limit, |
4484ebf1 | 1230 | cachep->batchcount); |
1da177e4 LT |
1231 | if (!nc) |
1232 | goto bad; | |
4484ebf1 RT |
1233 | shared = alloc_arraycache(node, |
1234 | cachep->shared * cachep->batchcount, | |
1235 | 0xbaadf00d); | |
1236 | if (!shared) | |
1237 | goto bad; | |
7a21ef6f | 1238 | |
3395ee05 PM |
1239 | if (use_alien_caches) { |
1240 | alien = alloc_alien_cache(node, cachep->limit); | |
1241 | if (!alien) | |
1242 | goto bad; | |
1243 | } | |
1da177e4 | 1244 | cachep->array[cpu] = nc; |
e498be7d CL |
1245 | l3 = cachep->nodelists[node]; |
1246 | BUG_ON(!l3); | |
e498be7d | 1247 | |
4484ebf1 RT |
1248 | spin_lock_irq(&l3->list_lock); |
1249 | if (!l3->shared) { | |
1250 | /* | |
1251 | * We are serialised from CPU_DEAD or | |
1252 | * CPU_UP_CANCELLED by the cpucontrol lock | |
1253 | */ | |
1254 | l3->shared = shared; | |
1255 | shared = NULL; | |
e498be7d | 1256 | } |
4484ebf1 RT |
1257 | #ifdef CONFIG_NUMA |
1258 | if (!l3->alien) { | |
1259 | l3->alien = alien; | |
1260 | alien = NULL; | |
1261 | } | |
1262 | #endif | |
1263 | spin_unlock_irq(&l3->list_lock); | |
4484ebf1 RT |
1264 | kfree(shared); |
1265 | free_alien_cache(alien); | |
1da177e4 | 1266 | } |
1da177e4 LT |
1267 | break; |
1268 | case CPU_ONLINE: | |
8f5be20b | 1269 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
1270 | start_cpu_timer(cpu); |
1271 | break; | |
1272 | #ifdef CONFIG_HOTPLUG_CPU | |
8f5be20b RT |
1273 | case CPU_DOWN_PREPARE: |
1274 | mutex_lock(&cache_chain_mutex); | |
1275 | break; | |
1276 | case CPU_DOWN_FAILED: | |
1277 | mutex_unlock(&cache_chain_mutex); | |
1278 | break; | |
1da177e4 | 1279 | case CPU_DEAD: |
4484ebf1 RT |
1280 | /* |
1281 | * Even if all the cpus of a node are down, we don't free the | |
1282 | * kmem_list3 of any cache. This to avoid a race between | |
1283 | * cpu_down, and a kmalloc allocation from another cpu for | |
1284 | * memory from the node of the cpu going down. The list3 | |
1285 | * structure is usually allocated from kmem_cache_create() and | |
1286 | * gets destroyed at kmem_cache_destroy(). | |
1287 | */ | |
1da177e4 | 1288 | /* fall thru */ |
8f5be20b | 1289 | #endif |
1da177e4 | 1290 | case CPU_UP_CANCELED: |
1da177e4 LT |
1291 | list_for_each_entry(cachep, &cache_chain, next) { |
1292 | struct array_cache *nc; | |
4484ebf1 RT |
1293 | struct array_cache *shared; |
1294 | struct array_cache **alien; | |
e498be7d | 1295 | cpumask_t mask; |
1da177e4 | 1296 | |
e498be7d | 1297 | mask = node_to_cpumask(node); |
1da177e4 LT |
1298 | /* cpu is dead; no one can alloc from it. */ |
1299 | nc = cachep->array[cpu]; | |
1300 | cachep->array[cpu] = NULL; | |
e498be7d CL |
1301 | l3 = cachep->nodelists[node]; |
1302 | ||
1303 | if (!l3) | |
4484ebf1 | 1304 | goto free_array_cache; |
e498be7d | 1305 | |
ca3b9b91 | 1306 | spin_lock_irq(&l3->list_lock); |
e498be7d CL |
1307 | |
1308 | /* Free limit for this kmem_list3 */ | |
1309 | l3->free_limit -= cachep->batchcount; | |
1310 | if (nc) | |
ff69416e | 1311 | free_block(cachep, nc->entry, nc->avail, node); |
e498be7d CL |
1312 | |
1313 | if (!cpus_empty(mask)) { | |
ca3b9b91 | 1314 | spin_unlock_irq(&l3->list_lock); |
4484ebf1 | 1315 | goto free_array_cache; |
b28a02de | 1316 | } |
e498be7d | 1317 | |
4484ebf1 RT |
1318 | shared = l3->shared; |
1319 | if (shared) { | |
e498be7d | 1320 | free_block(cachep, l3->shared->entry, |
b28a02de | 1321 | l3->shared->avail, node); |
e498be7d CL |
1322 | l3->shared = NULL; |
1323 | } | |
e498be7d | 1324 | |
4484ebf1 RT |
1325 | alien = l3->alien; |
1326 | l3->alien = NULL; | |
1327 | ||
1328 | spin_unlock_irq(&l3->list_lock); | |
1329 | ||
1330 | kfree(shared); | |
1331 | if (alien) { | |
1332 | drain_alien_cache(cachep, alien); | |
1333 | free_alien_cache(alien); | |
e498be7d | 1334 | } |
4484ebf1 | 1335 | free_array_cache: |
1da177e4 LT |
1336 | kfree(nc); |
1337 | } | |
4484ebf1 RT |
1338 | /* |
1339 | * In the previous loop, all the objects were freed to | |
1340 | * the respective cache's slabs, now we can go ahead and | |
1341 | * shrink each nodelist to its limit. | |
1342 | */ | |
1343 | list_for_each_entry(cachep, &cache_chain, next) { | |
1344 | l3 = cachep->nodelists[node]; | |
1345 | if (!l3) | |
1346 | continue; | |
ed11d9eb | 1347 | drain_freelist(cachep, l3, l3->free_objects); |
4484ebf1 | 1348 | } |
fc0abb14 | 1349 | mutex_unlock(&cache_chain_mutex); |
1da177e4 | 1350 | break; |
1da177e4 LT |
1351 | } |
1352 | return NOTIFY_OK; | |
a737b3e2 | 1353 | bad: |
1da177e4 LT |
1354 | return NOTIFY_BAD; |
1355 | } | |
1356 | ||
74b85f37 CS |
1357 | static struct notifier_block __cpuinitdata cpucache_notifier = { |
1358 | &cpuup_callback, NULL, 0 | |
1359 | }; | |
1da177e4 | 1360 | |
e498be7d CL |
1361 | /* |
1362 | * swap the static kmem_list3 with kmalloced memory | |
1363 | */ | |
a737b3e2 AM |
1364 | static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, |
1365 | int nodeid) | |
e498be7d CL |
1366 | { |
1367 | struct kmem_list3 *ptr; | |
1368 | ||
e498be7d CL |
1369 | ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid); |
1370 | BUG_ON(!ptr); | |
1371 | ||
1372 | local_irq_disable(); | |
1373 | memcpy(ptr, list, sizeof(struct kmem_list3)); | |
2b2d5493 IM |
1374 | /* |
1375 | * Do not assume that spinlocks can be initialized via memcpy: | |
1376 | */ | |
1377 | spin_lock_init(&ptr->list_lock); | |
1378 | ||
e498be7d CL |
1379 | MAKE_ALL_LISTS(cachep, ptr, nodeid); |
1380 | cachep->nodelists[nodeid] = ptr; | |
1381 | local_irq_enable(); | |
1382 | } | |
1383 | ||
a737b3e2 AM |
1384 | /* |
1385 | * Initialisation. Called after the page allocator have been initialised and | |
1386 | * before smp_init(). | |
1da177e4 LT |
1387 | */ |
1388 | void __init kmem_cache_init(void) | |
1389 | { | |
1390 | size_t left_over; | |
1391 | struct cache_sizes *sizes; | |
1392 | struct cache_names *names; | |
e498be7d | 1393 | int i; |
07ed76b2 | 1394 | int order; |
1ca4cb24 | 1395 | int node; |
e498be7d CL |
1396 | |
1397 | for (i = 0; i < NUM_INIT_LISTS; i++) { | |
1398 | kmem_list3_init(&initkmem_list3[i]); | |
1399 | if (i < MAX_NUMNODES) | |
1400 | cache_cache.nodelists[i] = NULL; | |
1401 | } | |
1da177e4 LT |
1402 | |
1403 | /* | |
1404 | * Fragmentation resistance on low memory - only use bigger | |
1405 | * page orders on machines with more than 32MB of memory. | |
1406 | */ | |
1407 | if (num_physpages > (32 << 20) >> PAGE_SHIFT) | |
1408 | slab_break_gfp_order = BREAK_GFP_ORDER_HI; | |
1409 | ||
1da177e4 LT |
1410 | /* Bootstrap is tricky, because several objects are allocated |
1411 | * from caches that do not exist yet: | |
a737b3e2 AM |
1412 | * 1) initialize the cache_cache cache: it contains the struct |
1413 | * kmem_cache structures of all caches, except cache_cache itself: | |
1414 | * cache_cache is statically allocated. | |
e498be7d CL |
1415 | * Initially an __init data area is used for the head array and the |
1416 | * kmem_list3 structures, it's replaced with a kmalloc allocated | |
1417 | * array at the end of the bootstrap. | |
1da177e4 | 1418 | * 2) Create the first kmalloc cache. |
343e0d7a | 1419 | * The struct kmem_cache for the new cache is allocated normally. |
e498be7d CL |
1420 | * An __init data area is used for the head array. |
1421 | * 3) Create the remaining kmalloc caches, with minimally sized | |
1422 | * head arrays. | |
1da177e4 LT |
1423 | * 4) Replace the __init data head arrays for cache_cache and the first |
1424 | * kmalloc cache with kmalloc allocated arrays. | |
e498be7d CL |
1425 | * 5) Replace the __init data for kmem_list3 for cache_cache and |
1426 | * the other cache's with kmalloc allocated memory. | |
1427 | * 6) Resize the head arrays of the kmalloc caches to their final sizes. | |
1da177e4 LT |
1428 | */ |
1429 | ||
1ca4cb24 PE |
1430 | node = numa_node_id(); |
1431 | ||
1da177e4 | 1432 | /* 1) create the cache_cache */ |
1da177e4 LT |
1433 | INIT_LIST_HEAD(&cache_chain); |
1434 | list_add(&cache_cache.next, &cache_chain); | |
1435 | cache_cache.colour_off = cache_line_size(); | |
1436 | cache_cache.array[smp_processor_id()] = &initarray_cache.cache; | |
1ca4cb24 | 1437 | cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE]; |
1da177e4 | 1438 | |
a737b3e2 AM |
1439 | cache_cache.buffer_size = ALIGN(cache_cache.buffer_size, |
1440 | cache_line_size()); | |
6a2d7a95 ED |
1441 | cache_cache.reciprocal_buffer_size = |
1442 | reciprocal_value(cache_cache.buffer_size); | |
1da177e4 | 1443 | |
07ed76b2 JS |
1444 | for (order = 0; order < MAX_ORDER; order++) { |
1445 | cache_estimate(order, cache_cache.buffer_size, | |
1446 | cache_line_size(), 0, &left_over, &cache_cache.num); | |
1447 | if (cache_cache.num) | |
1448 | break; | |
1449 | } | |
40094fa6 | 1450 | BUG_ON(!cache_cache.num); |
07ed76b2 | 1451 | cache_cache.gfporder = order; |
b28a02de | 1452 | cache_cache.colour = left_over / cache_cache.colour_off; |
b28a02de PE |
1453 | cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) + |
1454 | sizeof(struct slab), cache_line_size()); | |
1da177e4 LT |
1455 | |
1456 | /* 2+3) create the kmalloc caches */ | |
1457 | sizes = malloc_sizes; | |
1458 | names = cache_names; | |
1459 | ||
a737b3e2 AM |
1460 | /* |
1461 | * Initialize the caches that provide memory for the array cache and the | |
1462 | * kmem_list3 structures first. Without this, further allocations will | |
1463 | * bug. | |
e498be7d CL |
1464 | */ |
1465 | ||
1466 | sizes[INDEX_AC].cs_cachep = kmem_cache_create(names[INDEX_AC].name, | |
a737b3e2 AM |
1467 | sizes[INDEX_AC].cs_size, |
1468 | ARCH_KMALLOC_MINALIGN, | |
1469 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, | |
1470 | NULL, NULL); | |
e498be7d | 1471 | |
a737b3e2 | 1472 | if (INDEX_AC != INDEX_L3) { |
e498be7d | 1473 | sizes[INDEX_L3].cs_cachep = |
a737b3e2 AM |
1474 | kmem_cache_create(names[INDEX_L3].name, |
1475 | sizes[INDEX_L3].cs_size, | |
1476 | ARCH_KMALLOC_MINALIGN, | |
1477 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, | |
1478 | NULL, NULL); | |
1479 | } | |
e498be7d | 1480 | |
e0a42726 IM |
1481 | slab_early_init = 0; |
1482 | ||
1da177e4 | 1483 | while (sizes->cs_size != ULONG_MAX) { |
e498be7d CL |
1484 | /* |
1485 | * For performance, all the general caches are L1 aligned. | |
1da177e4 LT |
1486 | * This should be particularly beneficial on SMP boxes, as it |
1487 | * eliminates "false sharing". | |
1488 | * Note for systems short on memory removing the alignment will | |
e498be7d CL |
1489 | * allow tighter packing of the smaller caches. |
1490 | */ | |
a737b3e2 | 1491 | if (!sizes->cs_cachep) { |
e498be7d | 1492 | sizes->cs_cachep = kmem_cache_create(names->name, |
a737b3e2 AM |
1493 | sizes->cs_size, |
1494 | ARCH_KMALLOC_MINALIGN, | |
1495 | ARCH_KMALLOC_FLAGS|SLAB_PANIC, | |
1496 | NULL, NULL); | |
1497 | } | |
4b51d669 CL |
1498 | #ifdef CONFIG_ZONE_DMA |
1499 | sizes->cs_dmacachep = kmem_cache_create( | |
1500 | names->name_dma, | |
a737b3e2 AM |
1501 | sizes->cs_size, |
1502 | ARCH_KMALLOC_MINALIGN, | |
1503 | ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| | |
1504 | SLAB_PANIC, | |
1505 | NULL, NULL); | |
4b51d669 | 1506 | #endif |
1da177e4 LT |
1507 | sizes++; |
1508 | names++; | |
1509 | } | |
1510 | /* 4) Replace the bootstrap head arrays */ | |
1511 | { | |
2b2d5493 | 1512 | struct array_cache *ptr; |
e498be7d | 1513 | |
1da177e4 | 1514 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); |
e498be7d | 1515 | |
1da177e4 | 1516 | local_irq_disable(); |
9a2dba4b PE |
1517 | BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); |
1518 | memcpy(ptr, cpu_cache_get(&cache_cache), | |
b28a02de | 1519 | sizeof(struct arraycache_init)); |
2b2d5493 IM |
1520 | /* |
1521 | * Do not assume that spinlocks can be initialized via memcpy: | |
1522 | */ | |
1523 | spin_lock_init(&ptr->lock); | |
1524 | ||
1da177e4 LT |
1525 | cache_cache.array[smp_processor_id()] = ptr; |
1526 | local_irq_enable(); | |
e498be7d | 1527 | |
1da177e4 | 1528 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); |
e498be7d | 1529 | |
1da177e4 | 1530 | local_irq_disable(); |
9a2dba4b | 1531 | BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep) |
b28a02de | 1532 | != &initarray_generic.cache); |
9a2dba4b | 1533 | memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), |
b28a02de | 1534 | sizeof(struct arraycache_init)); |
2b2d5493 IM |
1535 | /* |
1536 | * Do not assume that spinlocks can be initialized via memcpy: | |
1537 | */ | |
1538 | spin_lock_init(&ptr->lock); | |
1539 | ||
e498be7d | 1540 | malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = |
b28a02de | 1541 | ptr; |
1da177e4 LT |
1542 | local_irq_enable(); |
1543 | } | |
e498be7d CL |
1544 | /* 5) Replace the bootstrap kmem_list3's */ |
1545 | { | |
1ca4cb24 PE |
1546 | int nid; |
1547 | ||
e498be7d | 1548 | /* Replace the static kmem_list3 structures for the boot cpu */ |
1ca4cb24 | 1549 | init_list(&cache_cache, &initkmem_list3[CACHE_CACHE], node); |
e498be7d | 1550 | |
1ca4cb24 | 1551 | for_each_online_node(nid) { |
e498be7d | 1552 | init_list(malloc_sizes[INDEX_AC].cs_cachep, |
1ca4cb24 | 1553 | &initkmem_list3[SIZE_AC + nid], nid); |
e498be7d CL |
1554 | |
1555 | if (INDEX_AC != INDEX_L3) { | |
1556 | init_list(malloc_sizes[INDEX_L3].cs_cachep, | |
1ca4cb24 | 1557 | &initkmem_list3[SIZE_L3 + nid], nid); |
e498be7d CL |
1558 | } |
1559 | } | |
1560 | } | |
1da177e4 | 1561 | |
e498be7d | 1562 | /* 6) resize the head arrays to their final sizes */ |
1da177e4 | 1563 | { |
343e0d7a | 1564 | struct kmem_cache *cachep; |
fc0abb14 | 1565 | mutex_lock(&cache_chain_mutex); |
1da177e4 | 1566 | list_for_each_entry(cachep, &cache_chain, next) |
2ed3a4ef CL |
1567 | if (enable_cpucache(cachep)) |
1568 | BUG(); | |
fc0abb14 | 1569 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
1570 | } |
1571 | ||
056c6241 RT |
1572 | /* Annotate slab for lockdep -- annotate the malloc caches */ |
1573 | init_lock_keys(); | |
1574 | ||
1575 | ||
1da177e4 LT |
1576 | /* Done! */ |
1577 | g_cpucache_up = FULL; | |
1578 | ||
a737b3e2 AM |
1579 | /* |
1580 | * Register a cpu startup notifier callback that initializes | |
1581 | * cpu_cache_get for all new cpus | |
1da177e4 LT |
1582 | */ |
1583 | register_cpu_notifier(&cpucache_notifier); | |
1da177e4 | 1584 | |
a737b3e2 AM |
1585 | /* |
1586 | * The reap timers are started later, with a module init call: That part | |
1587 | * of the kernel is not yet operational. | |
1da177e4 LT |
1588 | */ |
1589 | } | |
1590 | ||
1591 | static int __init cpucache_init(void) | |
1592 | { | |
1593 | int cpu; | |
1594 | ||
a737b3e2 AM |
1595 | /* |
1596 | * Register the timers that return unneeded pages to the page allocator | |
1da177e4 | 1597 | */ |
e498be7d | 1598 | for_each_online_cpu(cpu) |
a737b3e2 | 1599 | start_cpu_timer(cpu); |
1da177e4 LT |
1600 | return 0; |
1601 | } | |
1da177e4 LT |
1602 | __initcall(cpucache_init); |
1603 | ||
1604 | /* | |
1605 | * Interface to system's page allocator. No need to hold the cache-lock. | |
1606 | * | |
1607 | * If we requested dmaable memory, we will get it. Even if we | |
1608 | * did not request dmaable memory, we might get it, but that | |
1609 | * would be relatively rare and ignorable. | |
1610 | */ | |
343e0d7a | 1611 | static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
1da177e4 LT |
1612 | { |
1613 | struct page *page; | |
e1b6aa6f | 1614 | int nr_pages; |
1da177e4 LT |
1615 | int i; |
1616 | ||
d6fef9da | 1617 | #ifndef CONFIG_MMU |
e1b6aa6f CH |
1618 | /* |
1619 | * Nommu uses slab's for process anonymous memory allocations, and thus | |
1620 | * requires __GFP_COMP to properly refcount higher order allocations | |
d6fef9da | 1621 | */ |
e1b6aa6f | 1622 | flags |= __GFP_COMP; |
d6fef9da | 1623 | #endif |
765c4507 | 1624 | |
3c517a61 | 1625 | flags |= cachep->gfpflags; |
e1b6aa6f CH |
1626 | |
1627 | page = alloc_pages_node(nodeid, flags, cachep->gfporder); | |
1da177e4 LT |
1628 | if (!page) |
1629 | return NULL; | |
1da177e4 | 1630 | |
e1b6aa6f | 1631 | nr_pages = (1 << cachep->gfporder); |
1da177e4 | 1632 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
972d1a7b CL |
1633 | add_zone_page_state(page_zone(page), |
1634 | NR_SLAB_RECLAIMABLE, nr_pages); | |
1635 | else | |
1636 | add_zone_page_state(page_zone(page), | |
1637 | NR_SLAB_UNRECLAIMABLE, nr_pages); | |
e1b6aa6f CH |
1638 | for (i = 0; i < nr_pages; i++) |
1639 | __SetPageSlab(page + i); | |
1640 | return page_address(page); | |
1da177e4 LT |
1641 | } |
1642 | ||
1643 | /* | |
1644 | * Interface to system's page release. | |
1645 | */ | |
343e0d7a | 1646 | static void kmem_freepages(struct kmem_cache *cachep, void *addr) |
1da177e4 | 1647 | { |
b28a02de | 1648 | unsigned long i = (1 << cachep->gfporder); |
1da177e4 LT |
1649 | struct page *page = virt_to_page(addr); |
1650 | const unsigned long nr_freed = i; | |
1651 | ||
972d1a7b CL |
1652 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
1653 | sub_zone_page_state(page_zone(page), | |
1654 | NR_SLAB_RECLAIMABLE, nr_freed); | |
1655 | else | |
1656 | sub_zone_page_state(page_zone(page), | |
1657 | NR_SLAB_UNRECLAIMABLE, nr_freed); | |
1da177e4 | 1658 | while (i--) { |
f205b2fe NP |
1659 | BUG_ON(!PageSlab(page)); |
1660 | __ClearPageSlab(page); | |
1da177e4 LT |
1661 | page++; |
1662 | } | |
1da177e4 LT |
1663 | if (current->reclaim_state) |
1664 | current->reclaim_state->reclaimed_slab += nr_freed; | |
1665 | free_pages((unsigned long)addr, cachep->gfporder); | |
1da177e4 LT |
1666 | } |
1667 | ||
1668 | static void kmem_rcu_free(struct rcu_head *head) | |
1669 | { | |
b28a02de | 1670 | struct slab_rcu *slab_rcu = (struct slab_rcu *)head; |
343e0d7a | 1671 | struct kmem_cache *cachep = slab_rcu->cachep; |
1da177e4 LT |
1672 | |
1673 | kmem_freepages(cachep, slab_rcu->addr); | |
1674 | if (OFF_SLAB(cachep)) | |
1675 | kmem_cache_free(cachep->slabp_cache, slab_rcu); | |
1676 | } | |
1677 | ||
1678 | #if DEBUG | |
1679 | ||
1680 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
343e0d7a | 1681 | static void store_stackinfo(struct kmem_cache *cachep, unsigned long *addr, |
b28a02de | 1682 | unsigned long caller) |
1da177e4 | 1683 | { |
3dafccf2 | 1684 | int size = obj_size(cachep); |
1da177e4 | 1685 | |
3dafccf2 | 1686 | addr = (unsigned long *)&((char *)addr)[obj_offset(cachep)]; |
1da177e4 | 1687 | |
b28a02de | 1688 | if (size < 5 * sizeof(unsigned long)) |
1da177e4 LT |
1689 | return; |
1690 | ||
b28a02de PE |
1691 | *addr++ = 0x12345678; |
1692 | *addr++ = caller; | |
1693 | *addr++ = smp_processor_id(); | |
1694 | size -= 3 * sizeof(unsigned long); | |
1da177e4 LT |
1695 | { |
1696 | unsigned long *sptr = &caller; | |
1697 | unsigned long svalue; | |
1698 | ||
1699 | while (!kstack_end(sptr)) { | |
1700 | svalue = *sptr++; | |
1701 | if (kernel_text_address(svalue)) { | |
b28a02de | 1702 | *addr++ = svalue; |
1da177e4 LT |
1703 | size -= sizeof(unsigned long); |
1704 | if (size <= sizeof(unsigned long)) | |
1705 | break; | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | } | |
b28a02de | 1710 | *addr++ = 0x87654321; |
1da177e4 LT |
1711 | } |
1712 | #endif | |
1713 | ||
343e0d7a | 1714 | static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val) |
1da177e4 | 1715 | { |
3dafccf2 MS |
1716 | int size = obj_size(cachep); |
1717 | addr = &((char *)addr)[obj_offset(cachep)]; | |
1da177e4 LT |
1718 | |
1719 | memset(addr, val, size); | |
b28a02de | 1720 | *(unsigned char *)(addr + size - 1) = POISON_END; |
1da177e4 LT |
1721 | } |
1722 | ||
1723 | static void dump_line(char *data, int offset, int limit) | |
1724 | { | |
1725 | int i; | |
aa83aa40 DJ |
1726 | unsigned char error = 0; |
1727 | int bad_count = 0; | |
1728 | ||
1da177e4 | 1729 | printk(KERN_ERR "%03x:", offset); |
aa83aa40 DJ |
1730 | for (i = 0; i < limit; i++) { |
1731 | if (data[offset + i] != POISON_FREE) { | |
1732 | error = data[offset + i]; | |
1733 | bad_count++; | |
1734 | } | |
b28a02de | 1735 | printk(" %02x", (unsigned char)data[offset + i]); |
aa83aa40 | 1736 | } |
1da177e4 | 1737 | printk("\n"); |
aa83aa40 DJ |
1738 | |
1739 | if (bad_count == 1) { | |
1740 | error ^= POISON_FREE; | |
1741 | if (!(error & (error - 1))) { | |
1742 | printk(KERN_ERR "Single bit error detected. Probably " | |
1743 | "bad RAM.\n"); | |
1744 | #ifdef CONFIG_X86 | |
1745 | printk(KERN_ERR "Run memtest86+ or a similar memory " | |
1746 | "test tool.\n"); | |
1747 | #else | |
1748 | printk(KERN_ERR "Run a memory test tool.\n"); | |
1749 | #endif | |
1750 | } | |
1751 | } | |
1da177e4 LT |
1752 | } |
1753 | #endif | |
1754 | ||
1755 | #if DEBUG | |
1756 | ||
343e0d7a | 1757 | static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines) |
1da177e4 LT |
1758 | { |
1759 | int i, size; | |
1760 | char *realobj; | |
1761 | ||
1762 | if (cachep->flags & SLAB_RED_ZONE) { | |
1763 | printk(KERN_ERR "Redzone: 0x%lx/0x%lx.\n", | |
a737b3e2 AM |
1764 | *dbg_redzone1(cachep, objp), |
1765 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
1766 | } |
1767 | ||
1768 | if (cachep->flags & SLAB_STORE_USER) { | |
1769 | printk(KERN_ERR "Last user: [<%p>]", | |
a737b3e2 | 1770 | *dbg_userword(cachep, objp)); |
1da177e4 | 1771 | print_symbol("(%s)", |
a737b3e2 | 1772 | (unsigned long)*dbg_userword(cachep, objp)); |
1da177e4 LT |
1773 | printk("\n"); |
1774 | } | |
3dafccf2 MS |
1775 | realobj = (char *)objp + obj_offset(cachep); |
1776 | size = obj_size(cachep); | |
b28a02de | 1777 | for (i = 0; i < size && lines; i += 16, lines--) { |
1da177e4 LT |
1778 | int limit; |
1779 | limit = 16; | |
b28a02de PE |
1780 | if (i + limit > size) |
1781 | limit = size - i; | |
1da177e4 LT |
1782 | dump_line(realobj, i, limit); |
1783 | } | |
1784 | } | |
1785 | ||
343e0d7a | 1786 | static void check_poison_obj(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
1787 | { |
1788 | char *realobj; | |
1789 | int size, i; | |
1790 | int lines = 0; | |
1791 | ||
3dafccf2 MS |
1792 | realobj = (char *)objp + obj_offset(cachep); |
1793 | size = obj_size(cachep); | |
1da177e4 | 1794 | |
b28a02de | 1795 | for (i = 0; i < size; i++) { |
1da177e4 | 1796 | char exp = POISON_FREE; |
b28a02de | 1797 | if (i == size - 1) |
1da177e4 LT |
1798 | exp = POISON_END; |
1799 | if (realobj[i] != exp) { | |
1800 | int limit; | |
1801 | /* Mismatch ! */ | |
1802 | /* Print header */ | |
1803 | if (lines == 0) { | |
b28a02de | 1804 | printk(KERN_ERR |
a737b3e2 AM |
1805 | "Slab corruption: start=%p, len=%d\n", |
1806 | realobj, size); | |
1da177e4 LT |
1807 | print_objinfo(cachep, objp, 0); |
1808 | } | |
1809 | /* Hexdump the affected line */ | |
b28a02de | 1810 | i = (i / 16) * 16; |
1da177e4 | 1811 | limit = 16; |
b28a02de PE |
1812 | if (i + limit > size) |
1813 | limit = size - i; | |
1da177e4 LT |
1814 | dump_line(realobj, i, limit); |
1815 | i += 16; | |
1816 | lines++; | |
1817 | /* Limit to 5 lines */ | |
1818 | if (lines > 5) | |
1819 | break; | |
1820 | } | |
1821 | } | |
1822 | if (lines != 0) { | |
1823 | /* Print some data about the neighboring objects, if they | |
1824 | * exist: | |
1825 | */ | |
6ed5eb22 | 1826 | struct slab *slabp = virt_to_slab(objp); |
8fea4e96 | 1827 | unsigned int objnr; |
1da177e4 | 1828 | |
8fea4e96 | 1829 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 | 1830 | if (objnr) { |
8fea4e96 | 1831 | objp = index_to_obj(cachep, slabp, objnr - 1); |
3dafccf2 | 1832 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 1833 | printk(KERN_ERR "Prev obj: start=%p, len=%d\n", |
b28a02de | 1834 | realobj, size); |
1da177e4 LT |
1835 | print_objinfo(cachep, objp, 2); |
1836 | } | |
b28a02de | 1837 | if (objnr + 1 < cachep->num) { |
8fea4e96 | 1838 | objp = index_to_obj(cachep, slabp, objnr + 1); |
3dafccf2 | 1839 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 1840 | printk(KERN_ERR "Next obj: start=%p, len=%d\n", |
b28a02de | 1841 | realobj, size); |
1da177e4 LT |
1842 | print_objinfo(cachep, objp, 2); |
1843 | } | |
1844 | } | |
1845 | } | |
1846 | #endif | |
1847 | ||
12dd36fa MD |
1848 | #if DEBUG |
1849 | /** | |
911851e6 RD |
1850 | * slab_destroy_objs - destroy a slab and its objects |
1851 | * @cachep: cache pointer being destroyed | |
1852 | * @slabp: slab pointer being destroyed | |
1853 | * | |
1854 | * Call the registered destructor for each object in a slab that is being | |
1855 | * destroyed. | |
1da177e4 | 1856 | */ |
343e0d7a | 1857 | static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 | 1858 | { |
1da177e4 LT |
1859 | int i; |
1860 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 1861 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
1862 | |
1863 | if (cachep->flags & SLAB_POISON) { | |
1864 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
a737b3e2 AM |
1865 | if (cachep->buffer_size % PAGE_SIZE == 0 && |
1866 | OFF_SLAB(cachep)) | |
b28a02de | 1867 | kernel_map_pages(virt_to_page(objp), |
a737b3e2 | 1868 | cachep->buffer_size / PAGE_SIZE, 1); |
1da177e4 LT |
1869 | else |
1870 | check_poison_obj(cachep, objp); | |
1871 | #else | |
1872 | check_poison_obj(cachep, objp); | |
1873 | #endif | |
1874 | } | |
1875 | if (cachep->flags & SLAB_RED_ZONE) { | |
1876 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) | |
1877 | slab_error(cachep, "start of a freed object " | |
b28a02de | 1878 | "was overwritten"); |
1da177e4 LT |
1879 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) |
1880 | slab_error(cachep, "end of a freed object " | |
b28a02de | 1881 | "was overwritten"); |
1da177e4 LT |
1882 | } |
1883 | if (cachep->dtor && !(cachep->flags & SLAB_POISON)) | |
3dafccf2 | 1884 | (cachep->dtor) (objp + obj_offset(cachep), cachep, 0); |
1da177e4 | 1885 | } |
12dd36fa | 1886 | } |
1da177e4 | 1887 | #else |
343e0d7a | 1888 | static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa | 1889 | { |
1da177e4 LT |
1890 | if (cachep->dtor) { |
1891 | int i; | |
1892 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 1893 | void *objp = index_to_obj(cachep, slabp, i); |
b28a02de | 1894 | (cachep->dtor) (objp, cachep, 0); |
1da177e4 LT |
1895 | } |
1896 | } | |
12dd36fa | 1897 | } |
1da177e4 LT |
1898 | #endif |
1899 | ||
911851e6 RD |
1900 | /** |
1901 | * slab_destroy - destroy and release all objects in a slab | |
1902 | * @cachep: cache pointer being destroyed | |
1903 | * @slabp: slab pointer being destroyed | |
1904 | * | |
12dd36fa | 1905 | * Destroy all the objs in a slab, and release the mem back to the system. |
a737b3e2 AM |
1906 | * Before calling the slab must have been unlinked from the cache. The |
1907 | * cache-lock is not held/needed. | |
12dd36fa | 1908 | */ |
343e0d7a | 1909 | static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa MD |
1910 | { |
1911 | void *addr = slabp->s_mem - slabp->colouroff; | |
1912 | ||
1913 | slab_destroy_objs(cachep, slabp); | |
1da177e4 LT |
1914 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) { |
1915 | struct slab_rcu *slab_rcu; | |
1916 | ||
b28a02de | 1917 | slab_rcu = (struct slab_rcu *)slabp; |
1da177e4 LT |
1918 | slab_rcu->cachep = cachep; |
1919 | slab_rcu->addr = addr; | |
1920 | call_rcu(&slab_rcu->head, kmem_rcu_free); | |
1921 | } else { | |
1922 | kmem_freepages(cachep, addr); | |
873623df IM |
1923 | if (OFF_SLAB(cachep)) |
1924 | kmem_cache_free(cachep->slabp_cache, slabp); | |
1da177e4 LT |
1925 | } |
1926 | } | |
1927 | ||
a737b3e2 AM |
1928 | /* |
1929 | * For setting up all the kmem_list3s for cache whose buffer_size is same as | |
1930 | * size of kmem_list3. | |
1931 | */ | |
343e0d7a | 1932 | static void set_up_list3s(struct kmem_cache *cachep, int index) |
e498be7d CL |
1933 | { |
1934 | int node; | |
1935 | ||
1936 | for_each_online_node(node) { | |
b28a02de | 1937 | cachep->nodelists[node] = &initkmem_list3[index + node]; |
e498be7d | 1938 | cachep->nodelists[node]->next_reap = jiffies + |
b28a02de PE |
1939 | REAPTIMEOUT_LIST3 + |
1940 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
e498be7d CL |
1941 | } |
1942 | } | |
1943 | ||
117f6eb1 CL |
1944 | static void __kmem_cache_destroy(struct kmem_cache *cachep) |
1945 | { | |
1946 | int i; | |
1947 | struct kmem_list3 *l3; | |
1948 | ||
1949 | for_each_online_cpu(i) | |
1950 | kfree(cachep->array[i]); | |
1951 | ||
1952 | /* NUMA: free the list3 structures */ | |
1953 | for_each_online_node(i) { | |
1954 | l3 = cachep->nodelists[i]; | |
1955 | if (l3) { | |
1956 | kfree(l3->shared); | |
1957 | free_alien_cache(l3->alien); | |
1958 | kfree(l3); | |
1959 | } | |
1960 | } | |
1961 | kmem_cache_free(&cache_cache, cachep); | |
1962 | } | |
1963 | ||
1964 | ||
4d268eba | 1965 | /** |
a70773dd RD |
1966 | * calculate_slab_order - calculate size (page order) of slabs |
1967 | * @cachep: pointer to the cache that is being created | |
1968 | * @size: size of objects to be created in this cache. | |
1969 | * @align: required alignment for the objects. | |
1970 | * @flags: slab allocation flags | |
1971 | * | |
1972 | * Also calculates the number of objects per slab. | |
4d268eba PE |
1973 | * |
1974 | * This could be made much more intelligent. For now, try to avoid using | |
1975 | * high order pages for slabs. When the gfp() functions are more friendly | |
1976 | * towards high-order requests, this should be changed. | |
1977 | */ | |
a737b3e2 | 1978 | static size_t calculate_slab_order(struct kmem_cache *cachep, |
ee13d785 | 1979 | size_t size, size_t align, unsigned long flags) |
4d268eba | 1980 | { |
b1ab41c4 | 1981 | unsigned long offslab_limit; |
4d268eba | 1982 | size_t left_over = 0; |
9888e6fa | 1983 | int gfporder; |
4d268eba | 1984 | |
a737b3e2 | 1985 | for (gfporder = 0; gfporder <= MAX_GFP_ORDER; gfporder++) { |
4d268eba PE |
1986 | unsigned int num; |
1987 | size_t remainder; | |
1988 | ||
9888e6fa | 1989 | cache_estimate(gfporder, size, align, flags, &remainder, &num); |
4d268eba PE |
1990 | if (!num) |
1991 | continue; | |
9888e6fa | 1992 | |
b1ab41c4 IM |
1993 | if (flags & CFLGS_OFF_SLAB) { |
1994 | /* | |
1995 | * Max number of objs-per-slab for caches which | |
1996 | * use off-slab slabs. Needed to avoid a possible | |
1997 | * looping condition in cache_grow(). | |
1998 | */ | |
1999 | offslab_limit = size - sizeof(struct slab); | |
2000 | offslab_limit /= sizeof(kmem_bufctl_t); | |
2001 | ||
2002 | if (num > offslab_limit) | |
2003 | break; | |
2004 | } | |
4d268eba | 2005 | |
9888e6fa | 2006 | /* Found something acceptable - save it away */ |
4d268eba | 2007 | cachep->num = num; |
9888e6fa | 2008 | cachep->gfporder = gfporder; |
4d268eba PE |
2009 | left_over = remainder; |
2010 | ||
f78bb8ad LT |
2011 | /* |
2012 | * A VFS-reclaimable slab tends to have most allocations | |
2013 | * as GFP_NOFS and we really don't want to have to be allocating | |
2014 | * higher-order pages when we are unable to shrink dcache. | |
2015 | */ | |
2016 | if (flags & SLAB_RECLAIM_ACCOUNT) | |
2017 | break; | |
2018 | ||
4d268eba PE |
2019 | /* |
2020 | * Large number of objects is good, but very large slabs are | |
2021 | * currently bad for the gfp()s. | |
2022 | */ | |
9888e6fa | 2023 | if (gfporder >= slab_break_gfp_order) |
4d268eba PE |
2024 | break; |
2025 | ||
9888e6fa LT |
2026 | /* |
2027 | * Acceptable internal fragmentation? | |
2028 | */ | |
a737b3e2 | 2029 | if (left_over * 8 <= (PAGE_SIZE << gfporder)) |
4d268eba PE |
2030 | break; |
2031 | } | |
2032 | return left_over; | |
2033 | } | |
2034 | ||
2ed3a4ef | 2035 | static int setup_cpu_cache(struct kmem_cache *cachep) |
f30cf7d1 | 2036 | { |
2ed3a4ef CL |
2037 | if (g_cpucache_up == FULL) |
2038 | return enable_cpucache(cachep); | |
2039 | ||
f30cf7d1 PE |
2040 | if (g_cpucache_up == NONE) { |
2041 | /* | |
2042 | * Note: the first kmem_cache_create must create the cache | |
2043 | * that's used by kmalloc(24), otherwise the creation of | |
2044 | * further caches will BUG(). | |
2045 | */ | |
2046 | cachep->array[smp_processor_id()] = &initarray_generic.cache; | |
2047 | ||
2048 | /* | |
2049 | * If the cache that's used by kmalloc(sizeof(kmem_list3)) is | |
2050 | * the first cache, then we need to set up all its list3s, | |
2051 | * otherwise the creation of further caches will BUG(). | |
2052 | */ | |
2053 | set_up_list3s(cachep, SIZE_AC); | |
2054 | if (INDEX_AC == INDEX_L3) | |
2055 | g_cpucache_up = PARTIAL_L3; | |
2056 | else | |
2057 | g_cpucache_up = PARTIAL_AC; | |
2058 | } else { | |
2059 | cachep->array[smp_processor_id()] = | |
2060 | kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); | |
2061 | ||
2062 | if (g_cpucache_up == PARTIAL_AC) { | |
2063 | set_up_list3s(cachep, SIZE_L3); | |
2064 | g_cpucache_up = PARTIAL_L3; | |
2065 | } else { | |
2066 | int node; | |
2067 | for_each_online_node(node) { | |
2068 | cachep->nodelists[node] = | |
2069 | kmalloc_node(sizeof(struct kmem_list3), | |
2070 | GFP_KERNEL, node); | |
2071 | BUG_ON(!cachep->nodelists[node]); | |
2072 | kmem_list3_init(cachep->nodelists[node]); | |
2073 | } | |
2074 | } | |
2075 | } | |
2076 | cachep->nodelists[numa_node_id()]->next_reap = | |
2077 | jiffies + REAPTIMEOUT_LIST3 + | |
2078 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
2079 | ||
2080 | cpu_cache_get(cachep)->avail = 0; | |
2081 | cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; | |
2082 | cpu_cache_get(cachep)->batchcount = 1; | |
2083 | cpu_cache_get(cachep)->touched = 0; | |
2084 | cachep->batchcount = 1; | |
2085 | cachep->limit = BOOT_CPUCACHE_ENTRIES; | |
2ed3a4ef | 2086 | return 0; |
f30cf7d1 PE |
2087 | } |
2088 | ||
1da177e4 LT |
2089 | /** |
2090 | * kmem_cache_create - Create a cache. | |
2091 | * @name: A string which is used in /proc/slabinfo to identify this cache. | |
2092 | * @size: The size of objects to be created in this cache. | |
2093 | * @align: The required alignment for the objects. | |
2094 | * @flags: SLAB flags | |
2095 | * @ctor: A constructor for the objects. | |
2096 | * @dtor: A destructor for the objects. | |
2097 | * | |
2098 | * Returns a ptr to the cache on success, NULL on failure. | |
2099 | * Cannot be called within a int, but can be interrupted. | |
2100 | * The @ctor is run when new pages are allocated by the cache | |
2101 | * and the @dtor is run before the pages are handed back. | |
2102 | * | |
2103 | * @name must be valid until the cache is destroyed. This implies that | |
a737b3e2 AM |
2104 | * the module calling this has to destroy the cache before getting unloaded. |
2105 | * | |
1da177e4 LT |
2106 | * The flags are |
2107 | * | |
2108 | * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) | |
2109 | * to catch references to uninitialised memory. | |
2110 | * | |
2111 | * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check | |
2112 | * for buffer overruns. | |
2113 | * | |
1da177e4 LT |
2114 | * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware |
2115 | * cacheline. This can be beneficial if you're counting cycles as closely | |
2116 | * as davem. | |
2117 | */ | |
343e0d7a | 2118 | struct kmem_cache * |
1da177e4 | 2119 | kmem_cache_create (const char *name, size_t size, size_t align, |
a737b3e2 AM |
2120 | unsigned long flags, |
2121 | void (*ctor)(void*, struct kmem_cache *, unsigned long), | |
343e0d7a | 2122 | void (*dtor)(void*, struct kmem_cache *, unsigned long)) |
1da177e4 LT |
2123 | { |
2124 | size_t left_over, slab_size, ralign; | |
7a7c381d | 2125 | struct kmem_cache *cachep = NULL, *pc; |
1da177e4 LT |
2126 | |
2127 | /* | |
2128 | * Sanity checks... these are all serious usage bugs. | |
2129 | */ | |
a737b3e2 | 2130 | if (!name || in_interrupt() || (size < BYTES_PER_WORD) || |
b28a02de | 2131 | (size > (1 << MAX_OBJ_ORDER) * PAGE_SIZE) || (dtor && !ctor)) { |
a737b3e2 AM |
2132 | printk(KERN_ERR "%s: Early error in slab %s\n", __FUNCTION__, |
2133 | name); | |
b28a02de PE |
2134 | BUG(); |
2135 | } | |
1da177e4 | 2136 | |
f0188f47 | 2137 | /* |
8f5be20b RT |
2138 | * We use cache_chain_mutex to ensure a consistent view of |
2139 | * cpu_online_map as well. Please see cpuup_callback | |
f0188f47 | 2140 | */ |
fc0abb14 | 2141 | mutex_lock(&cache_chain_mutex); |
4f12bb4f | 2142 | |
7a7c381d | 2143 | list_for_each_entry(pc, &cache_chain, next) { |
4f12bb4f AM |
2144 | char tmp; |
2145 | int res; | |
2146 | ||
2147 | /* | |
2148 | * This happens when the module gets unloaded and doesn't | |
2149 | * destroy its slab cache and no-one else reuses the vmalloc | |
2150 | * area of the module. Print a warning. | |
2151 | */ | |
138ae663 | 2152 | res = probe_kernel_address(pc->name, tmp); |
4f12bb4f AM |
2153 | if (res) { |
2154 | printk("SLAB: cache with size %d has lost its name\n", | |
3dafccf2 | 2155 | pc->buffer_size); |
4f12bb4f AM |
2156 | continue; |
2157 | } | |
2158 | ||
b28a02de | 2159 | if (!strcmp(pc->name, name)) { |
4f12bb4f AM |
2160 | printk("kmem_cache_create: duplicate cache %s\n", name); |
2161 | dump_stack(); | |
2162 | goto oops; | |
2163 | } | |
2164 | } | |
2165 | ||
1da177e4 LT |
2166 | #if DEBUG |
2167 | WARN_ON(strchr(name, ' ')); /* It confuses parsers */ | |
2168 | if ((flags & SLAB_DEBUG_INITIAL) && !ctor) { | |
2169 | /* No constructor, but inital state check requested */ | |
2170 | printk(KERN_ERR "%s: No con, but init state check " | |
b28a02de | 2171 | "requested - %s\n", __FUNCTION__, name); |
1da177e4 LT |
2172 | flags &= ~SLAB_DEBUG_INITIAL; |
2173 | } | |
1da177e4 LT |
2174 | #if FORCED_DEBUG |
2175 | /* | |
2176 | * Enable redzoning and last user accounting, except for caches with | |
2177 | * large objects, if the increased size would increase the object size | |
2178 | * above the next power of two: caches with object sizes just above a | |
2179 | * power of two have a significant amount of internal fragmentation. | |
2180 | */ | |
a737b3e2 | 2181 | if (size < 4096 || fls(size - 1) == fls(size-1 + 3 * BYTES_PER_WORD)) |
b28a02de | 2182 | flags |= SLAB_RED_ZONE | SLAB_STORE_USER; |
1da177e4 LT |
2183 | if (!(flags & SLAB_DESTROY_BY_RCU)) |
2184 | flags |= SLAB_POISON; | |
2185 | #endif | |
2186 | if (flags & SLAB_DESTROY_BY_RCU) | |
2187 | BUG_ON(flags & SLAB_POISON); | |
2188 | #endif | |
2189 | if (flags & SLAB_DESTROY_BY_RCU) | |
2190 | BUG_ON(dtor); | |
2191 | ||
2192 | /* | |
a737b3e2 AM |
2193 | * Always checks flags, a caller might be expecting debug support which |
2194 | * isn't available. | |
1da177e4 | 2195 | */ |
40094fa6 | 2196 | BUG_ON(flags & ~CREATE_MASK); |
1da177e4 | 2197 | |
a737b3e2 AM |
2198 | /* |
2199 | * Check that size is in terms of words. This is needed to avoid | |
1da177e4 LT |
2200 | * unaligned accesses for some archs when redzoning is used, and makes |
2201 | * sure any on-slab bufctl's are also correctly aligned. | |
2202 | */ | |
b28a02de PE |
2203 | if (size & (BYTES_PER_WORD - 1)) { |
2204 | size += (BYTES_PER_WORD - 1); | |
2205 | size &= ~(BYTES_PER_WORD - 1); | |
1da177e4 LT |
2206 | } |
2207 | ||
a737b3e2 AM |
2208 | /* calculate the final buffer alignment: */ |
2209 | ||
1da177e4 LT |
2210 | /* 1) arch recommendation: can be overridden for debug */ |
2211 | if (flags & SLAB_HWCACHE_ALIGN) { | |
a737b3e2 AM |
2212 | /* |
2213 | * Default alignment: as specified by the arch code. Except if | |
2214 | * an object is really small, then squeeze multiple objects into | |
2215 | * one cacheline. | |
1da177e4 LT |
2216 | */ |
2217 | ralign = cache_line_size(); | |
b28a02de | 2218 | while (size <= ralign / 2) |
1da177e4 LT |
2219 | ralign /= 2; |
2220 | } else { | |
2221 | ralign = BYTES_PER_WORD; | |
2222 | } | |
ca5f9703 PE |
2223 | |
2224 | /* | |
2225 | * Redzoning and user store require word alignment. Note this will be | |
2226 | * overridden by architecture or caller mandated alignment if either | |
2227 | * is greater than BYTES_PER_WORD. | |
2228 | */ | |
2229 | if (flags & SLAB_RED_ZONE || flags & SLAB_STORE_USER) | |
2230 | ralign = BYTES_PER_WORD; | |
2231 | ||
a44b56d3 | 2232 | /* 2) arch mandated alignment */ |
1da177e4 LT |
2233 | if (ralign < ARCH_SLAB_MINALIGN) { |
2234 | ralign = ARCH_SLAB_MINALIGN; | |
1da177e4 | 2235 | } |
a44b56d3 | 2236 | /* 3) caller mandated alignment */ |
1da177e4 LT |
2237 | if (ralign < align) { |
2238 | ralign = align; | |
1da177e4 | 2239 | } |
a44b56d3 KH |
2240 | /* disable debug if necessary */ |
2241 | if (ralign > BYTES_PER_WORD) | |
2242 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); | |
a737b3e2 | 2243 | /* |
ca5f9703 | 2244 | * 4) Store it. |
1da177e4 LT |
2245 | */ |
2246 | align = ralign; | |
2247 | ||
2248 | /* Get cache's description obj. */ | |
e94b1766 | 2249 | cachep = kmem_cache_zalloc(&cache_cache, GFP_KERNEL); |
1da177e4 | 2250 | if (!cachep) |
4f12bb4f | 2251 | goto oops; |
1da177e4 LT |
2252 | |
2253 | #if DEBUG | |
3dafccf2 | 2254 | cachep->obj_size = size; |
1da177e4 | 2255 | |
ca5f9703 PE |
2256 | /* |
2257 | * Both debugging options require word-alignment which is calculated | |
2258 | * into align above. | |
2259 | */ | |
1da177e4 | 2260 | if (flags & SLAB_RED_ZONE) { |
1da177e4 | 2261 | /* add space for red zone words */ |
3dafccf2 | 2262 | cachep->obj_offset += BYTES_PER_WORD; |
b28a02de | 2263 | size += 2 * BYTES_PER_WORD; |
1da177e4 LT |
2264 | } |
2265 | if (flags & SLAB_STORE_USER) { | |
ca5f9703 PE |
2266 | /* user store requires one word storage behind the end of |
2267 | * the real object. | |
1da177e4 | 2268 | */ |
1da177e4 LT |
2269 | size += BYTES_PER_WORD; |
2270 | } | |
2271 | #if FORCED_DEBUG && defined(CONFIG_DEBUG_PAGEALLOC) | |
b28a02de | 2272 | if (size >= malloc_sizes[INDEX_L3 + 1].cs_size |
3dafccf2 MS |
2273 | && cachep->obj_size > cache_line_size() && size < PAGE_SIZE) { |
2274 | cachep->obj_offset += PAGE_SIZE - size; | |
1da177e4 LT |
2275 | size = PAGE_SIZE; |
2276 | } | |
2277 | #endif | |
2278 | #endif | |
2279 | ||
e0a42726 IM |
2280 | /* |
2281 | * Determine if the slab management is 'on' or 'off' slab. | |
2282 | * (bootstrapping cannot cope with offslab caches so don't do | |
2283 | * it too early on.) | |
2284 | */ | |
2285 | if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init) | |
1da177e4 LT |
2286 | /* |
2287 | * Size is large, assume best to place the slab management obj | |
2288 | * off-slab (should allow better packing of objs). | |
2289 | */ | |
2290 | flags |= CFLGS_OFF_SLAB; | |
2291 | ||
2292 | size = ALIGN(size, align); | |
2293 | ||
f78bb8ad | 2294 | left_over = calculate_slab_order(cachep, size, align, flags); |
1da177e4 LT |
2295 | |
2296 | if (!cachep->num) { | |
2297 | printk("kmem_cache_create: couldn't create cache %s.\n", name); | |
2298 | kmem_cache_free(&cache_cache, cachep); | |
2299 | cachep = NULL; | |
4f12bb4f | 2300 | goto oops; |
1da177e4 | 2301 | } |
b28a02de PE |
2302 | slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) |
2303 | + sizeof(struct slab), align); | |
1da177e4 LT |
2304 | |
2305 | /* | |
2306 | * If the slab has been placed off-slab, and we have enough space then | |
2307 | * move it on-slab. This is at the expense of any extra colouring. | |
2308 | */ | |
2309 | if (flags & CFLGS_OFF_SLAB && left_over >= slab_size) { | |
2310 | flags &= ~CFLGS_OFF_SLAB; | |
2311 | left_over -= slab_size; | |
2312 | } | |
2313 | ||
2314 | if (flags & CFLGS_OFF_SLAB) { | |
2315 | /* really off slab. No need for manual alignment */ | |
b28a02de PE |
2316 | slab_size = |
2317 | cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab); | |
1da177e4 LT |
2318 | } |
2319 | ||
2320 | cachep->colour_off = cache_line_size(); | |
2321 | /* Offset must be a multiple of the alignment. */ | |
2322 | if (cachep->colour_off < align) | |
2323 | cachep->colour_off = align; | |
b28a02de | 2324 | cachep->colour = left_over / cachep->colour_off; |
1da177e4 LT |
2325 | cachep->slab_size = slab_size; |
2326 | cachep->flags = flags; | |
2327 | cachep->gfpflags = 0; | |
4b51d669 | 2328 | if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA)) |
1da177e4 | 2329 | cachep->gfpflags |= GFP_DMA; |
3dafccf2 | 2330 | cachep->buffer_size = size; |
6a2d7a95 | 2331 | cachep->reciprocal_buffer_size = reciprocal_value(size); |
1da177e4 | 2332 | |
e5ac9c5a | 2333 | if (flags & CFLGS_OFF_SLAB) { |
b2d55073 | 2334 | cachep->slabp_cache = kmem_find_general_cachep(slab_size, 0u); |
e5ac9c5a RT |
2335 | /* |
2336 | * This is a possibility for one of the malloc_sizes caches. | |
2337 | * But since we go off slab only for object size greater than | |
2338 | * PAGE_SIZE/8, and malloc_sizes gets created in ascending order, | |
2339 | * this should not happen at all. | |
2340 | * But leave a BUG_ON for some lucky dude. | |
2341 | */ | |
2342 | BUG_ON(!cachep->slabp_cache); | |
2343 | } | |
1da177e4 LT |
2344 | cachep->ctor = ctor; |
2345 | cachep->dtor = dtor; | |
2346 | cachep->name = name; | |
2347 | ||
2ed3a4ef CL |
2348 | if (setup_cpu_cache(cachep)) { |
2349 | __kmem_cache_destroy(cachep); | |
2350 | cachep = NULL; | |
2351 | goto oops; | |
2352 | } | |
1da177e4 | 2353 | |
1da177e4 LT |
2354 | /* cache setup completed, link it into the list */ |
2355 | list_add(&cachep->next, &cache_chain); | |
a737b3e2 | 2356 | oops: |
1da177e4 LT |
2357 | if (!cachep && (flags & SLAB_PANIC)) |
2358 | panic("kmem_cache_create(): failed to create slab `%s'\n", | |
b28a02de | 2359 | name); |
fc0abb14 | 2360 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
2361 | return cachep; |
2362 | } | |
2363 | EXPORT_SYMBOL(kmem_cache_create); | |
2364 | ||
2365 | #if DEBUG | |
2366 | static void check_irq_off(void) | |
2367 | { | |
2368 | BUG_ON(!irqs_disabled()); | |
2369 | } | |
2370 | ||
2371 | static void check_irq_on(void) | |
2372 | { | |
2373 | BUG_ON(irqs_disabled()); | |
2374 | } | |
2375 | ||
343e0d7a | 2376 | static void check_spinlock_acquired(struct kmem_cache *cachep) |
1da177e4 LT |
2377 | { |
2378 | #ifdef CONFIG_SMP | |
2379 | check_irq_off(); | |
e498be7d | 2380 | assert_spin_locked(&cachep->nodelists[numa_node_id()]->list_lock); |
1da177e4 LT |
2381 | #endif |
2382 | } | |
e498be7d | 2383 | |
343e0d7a | 2384 | static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node) |
e498be7d CL |
2385 | { |
2386 | #ifdef CONFIG_SMP | |
2387 | check_irq_off(); | |
2388 | assert_spin_locked(&cachep->nodelists[node]->list_lock); | |
2389 | #endif | |
2390 | } | |
2391 | ||
1da177e4 LT |
2392 | #else |
2393 | #define check_irq_off() do { } while(0) | |
2394 | #define check_irq_on() do { } while(0) | |
2395 | #define check_spinlock_acquired(x) do { } while(0) | |
e498be7d | 2396 | #define check_spinlock_acquired_node(x, y) do { } while(0) |
1da177e4 LT |
2397 | #endif |
2398 | ||
aab2207c CL |
2399 | static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, |
2400 | struct array_cache *ac, | |
2401 | int force, int node); | |
2402 | ||
1da177e4 LT |
2403 | static void do_drain(void *arg) |
2404 | { | |
a737b3e2 | 2405 | struct kmem_cache *cachep = arg; |
1da177e4 | 2406 | struct array_cache *ac; |
ff69416e | 2407 | int node = numa_node_id(); |
1da177e4 LT |
2408 | |
2409 | check_irq_off(); | |
9a2dba4b | 2410 | ac = cpu_cache_get(cachep); |
ff69416e CL |
2411 | spin_lock(&cachep->nodelists[node]->list_lock); |
2412 | free_block(cachep, ac->entry, ac->avail, node); | |
2413 | spin_unlock(&cachep->nodelists[node]->list_lock); | |
1da177e4 LT |
2414 | ac->avail = 0; |
2415 | } | |
2416 | ||
343e0d7a | 2417 | static void drain_cpu_caches(struct kmem_cache *cachep) |
1da177e4 | 2418 | { |
e498be7d CL |
2419 | struct kmem_list3 *l3; |
2420 | int node; | |
2421 | ||
a07fa394 | 2422 | on_each_cpu(do_drain, cachep, 1, 1); |
1da177e4 | 2423 | check_irq_on(); |
b28a02de | 2424 | for_each_online_node(node) { |
e498be7d | 2425 | l3 = cachep->nodelists[node]; |
a4523a8b RD |
2426 | if (l3 && l3->alien) |
2427 | drain_alien_cache(cachep, l3->alien); | |
2428 | } | |
2429 | ||
2430 | for_each_online_node(node) { | |
2431 | l3 = cachep->nodelists[node]; | |
2432 | if (l3) | |
aab2207c | 2433 | drain_array(cachep, l3, l3->shared, 1, node); |
e498be7d | 2434 | } |
1da177e4 LT |
2435 | } |
2436 | ||
ed11d9eb CL |
2437 | /* |
2438 | * Remove slabs from the list of free slabs. | |
2439 | * Specify the number of slabs to drain in tofree. | |
2440 | * | |
2441 | * Returns the actual number of slabs released. | |
2442 | */ | |
2443 | static int drain_freelist(struct kmem_cache *cache, | |
2444 | struct kmem_list3 *l3, int tofree) | |
1da177e4 | 2445 | { |
ed11d9eb CL |
2446 | struct list_head *p; |
2447 | int nr_freed; | |
1da177e4 | 2448 | struct slab *slabp; |
1da177e4 | 2449 | |
ed11d9eb CL |
2450 | nr_freed = 0; |
2451 | while (nr_freed < tofree && !list_empty(&l3->slabs_free)) { | |
1da177e4 | 2452 | |
ed11d9eb | 2453 | spin_lock_irq(&l3->list_lock); |
e498be7d | 2454 | p = l3->slabs_free.prev; |
ed11d9eb CL |
2455 | if (p == &l3->slabs_free) { |
2456 | spin_unlock_irq(&l3->list_lock); | |
2457 | goto out; | |
2458 | } | |
1da177e4 | 2459 | |
ed11d9eb | 2460 | slabp = list_entry(p, struct slab, list); |
1da177e4 | 2461 | #if DEBUG |
40094fa6 | 2462 | BUG_ON(slabp->inuse); |
1da177e4 LT |
2463 | #endif |
2464 | list_del(&slabp->list); | |
ed11d9eb CL |
2465 | /* |
2466 | * Safe to drop the lock. The slab is no longer linked | |
2467 | * to the cache. | |
2468 | */ | |
2469 | l3->free_objects -= cache->num; | |
e498be7d | 2470 | spin_unlock_irq(&l3->list_lock); |
ed11d9eb CL |
2471 | slab_destroy(cache, slabp); |
2472 | nr_freed++; | |
1da177e4 | 2473 | } |
ed11d9eb CL |
2474 | out: |
2475 | return nr_freed; | |
1da177e4 LT |
2476 | } |
2477 | ||
8f5be20b | 2478 | /* Called with cache_chain_mutex held to protect against cpu hotplug */ |
343e0d7a | 2479 | static int __cache_shrink(struct kmem_cache *cachep) |
e498be7d CL |
2480 | { |
2481 | int ret = 0, i = 0; | |
2482 | struct kmem_list3 *l3; | |
2483 | ||
2484 | drain_cpu_caches(cachep); | |
2485 | ||
2486 | check_irq_on(); | |
2487 | for_each_online_node(i) { | |
2488 | l3 = cachep->nodelists[i]; | |
ed11d9eb CL |
2489 | if (!l3) |
2490 | continue; | |
2491 | ||
2492 | drain_freelist(cachep, l3, l3->free_objects); | |
2493 | ||
2494 | ret += !list_empty(&l3->slabs_full) || | |
2495 | !list_empty(&l3->slabs_partial); | |
e498be7d CL |
2496 | } |
2497 | return (ret ? 1 : 0); | |
2498 | } | |
2499 | ||
1da177e4 LT |
2500 | /** |
2501 | * kmem_cache_shrink - Shrink a cache. | |
2502 | * @cachep: The cache to shrink. | |
2503 | * | |
2504 | * Releases as many slabs as possible for a cache. | |
2505 | * To help debugging, a zero exit status indicates all slabs were released. | |
2506 | */ | |
343e0d7a | 2507 | int kmem_cache_shrink(struct kmem_cache *cachep) |
1da177e4 | 2508 | { |
8f5be20b | 2509 | int ret; |
40094fa6 | 2510 | BUG_ON(!cachep || in_interrupt()); |
1da177e4 | 2511 | |
8f5be20b RT |
2512 | mutex_lock(&cache_chain_mutex); |
2513 | ret = __cache_shrink(cachep); | |
2514 | mutex_unlock(&cache_chain_mutex); | |
2515 | return ret; | |
1da177e4 LT |
2516 | } |
2517 | EXPORT_SYMBOL(kmem_cache_shrink); | |
2518 | ||
2519 | /** | |
2520 | * kmem_cache_destroy - delete a cache | |
2521 | * @cachep: the cache to destroy | |
2522 | * | |
343e0d7a | 2523 | * Remove a struct kmem_cache object from the slab cache. |
1da177e4 LT |
2524 | * |
2525 | * It is expected this function will be called by a module when it is | |
2526 | * unloaded. This will remove the cache completely, and avoid a duplicate | |
2527 | * cache being allocated each time a module is loaded and unloaded, if the | |
2528 | * module doesn't have persistent in-kernel storage across loads and unloads. | |
2529 | * | |
2530 | * The cache must be empty before calling this function. | |
2531 | * | |
2532 | * The caller must guarantee that noone will allocate memory from the cache | |
2533 | * during the kmem_cache_destroy(). | |
2534 | */ | |
133d205a | 2535 | void kmem_cache_destroy(struct kmem_cache *cachep) |
1da177e4 | 2536 | { |
40094fa6 | 2537 | BUG_ON(!cachep || in_interrupt()); |
1da177e4 | 2538 | |
1da177e4 | 2539 | /* Find the cache in the chain of caches. */ |
fc0abb14 | 2540 | mutex_lock(&cache_chain_mutex); |
1da177e4 LT |
2541 | /* |
2542 | * the chain is never empty, cache_cache is never destroyed | |
2543 | */ | |
2544 | list_del(&cachep->next); | |
1da177e4 LT |
2545 | if (__cache_shrink(cachep)) { |
2546 | slab_error(cachep, "Can't free all objects"); | |
b28a02de | 2547 | list_add(&cachep->next, &cache_chain); |
fc0abb14 | 2548 | mutex_unlock(&cache_chain_mutex); |
133d205a | 2549 | return; |
1da177e4 LT |
2550 | } |
2551 | ||
2552 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) | |
fbd568a3 | 2553 | synchronize_rcu(); |
1da177e4 | 2554 | |
117f6eb1 | 2555 | __kmem_cache_destroy(cachep); |
8f5be20b | 2556 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
2557 | } |
2558 | EXPORT_SYMBOL(kmem_cache_destroy); | |
2559 | ||
e5ac9c5a RT |
2560 | /* |
2561 | * Get the memory for a slab management obj. | |
2562 | * For a slab cache when the slab descriptor is off-slab, slab descriptors | |
2563 | * always come from malloc_sizes caches. The slab descriptor cannot | |
2564 | * come from the same cache which is getting created because, | |
2565 | * when we are searching for an appropriate cache for these | |
2566 | * descriptors in kmem_cache_create, we search through the malloc_sizes array. | |
2567 | * If we are creating a malloc_sizes cache here it would not be visible to | |
2568 | * kmem_find_general_cachep till the initialization is complete. | |
2569 | * Hence we cannot have slabp_cache same as the original cache. | |
2570 | */ | |
343e0d7a | 2571 | static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp, |
5b74ada7 RT |
2572 | int colour_off, gfp_t local_flags, |
2573 | int nodeid) | |
1da177e4 LT |
2574 | { |
2575 | struct slab *slabp; | |
b28a02de | 2576 | |
1da177e4 LT |
2577 | if (OFF_SLAB(cachep)) { |
2578 | /* Slab management obj is off-slab. */ | |
5b74ada7 | 2579 | slabp = kmem_cache_alloc_node(cachep->slabp_cache, |
3c517a61 | 2580 | local_flags & ~GFP_THISNODE, nodeid); |
1da177e4 LT |
2581 | if (!slabp) |
2582 | return NULL; | |
2583 | } else { | |
b28a02de | 2584 | slabp = objp + colour_off; |
1da177e4 LT |
2585 | colour_off += cachep->slab_size; |
2586 | } | |
2587 | slabp->inuse = 0; | |
2588 | slabp->colouroff = colour_off; | |
b28a02de | 2589 | slabp->s_mem = objp + colour_off; |
5b74ada7 | 2590 | slabp->nodeid = nodeid; |
1da177e4 LT |
2591 | return slabp; |
2592 | } | |
2593 | ||
2594 | static inline kmem_bufctl_t *slab_bufctl(struct slab *slabp) | |
2595 | { | |
b28a02de | 2596 | return (kmem_bufctl_t *) (slabp + 1); |
1da177e4 LT |
2597 | } |
2598 | ||
343e0d7a | 2599 | static void cache_init_objs(struct kmem_cache *cachep, |
b28a02de | 2600 | struct slab *slabp, unsigned long ctor_flags) |
1da177e4 LT |
2601 | { |
2602 | int i; | |
2603 | ||
2604 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 2605 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
2606 | #if DEBUG |
2607 | /* need to poison the objs? */ | |
2608 | if (cachep->flags & SLAB_POISON) | |
2609 | poison_obj(cachep, objp, POISON_FREE); | |
2610 | if (cachep->flags & SLAB_STORE_USER) | |
2611 | *dbg_userword(cachep, objp) = NULL; | |
2612 | ||
2613 | if (cachep->flags & SLAB_RED_ZONE) { | |
2614 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; | |
2615 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
2616 | } | |
2617 | /* | |
a737b3e2 AM |
2618 | * Constructors are not allowed to allocate memory from the same |
2619 | * cache which they are a constructor for. Otherwise, deadlock. | |
2620 | * They must also be threaded. | |
1da177e4 LT |
2621 | */ |
2622 | if (cachep->ctor && !(cachep->flags & SLAB_POISON)) | |
3dafccf2 | 2623 | cachep->ctor(objp + obj_offset(cachep), cachep, |
b28a02de | 2624 | ctor_flags); |
1da177e4 LT |
2625 | |
2626 | if (cachep->flags & SLAB_RED_ZONE) { | |
2627 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) | |
2628 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2629 | " end of an object"); |
1da177e4 LT |
2630 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) |
2631 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2632 | " start of an object"); |
1da177e4 | 2633 | } |
a737b3e2 AM |
2634 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && |
2635 | OFF_SLAB(cachep) && cachep->flags & SLAB_POISON) | |
b28a02de | 2636 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 2637 | cachep->buffer_size / PAGE_SIZE, 0); |
1da177e4 LT |
2638 | #else |
2639 | if (cachep->ctor) | |
2640 | cachep->ctor(objp, cachep, ctor_flags); | |
2641 | #endif | |
b28a02de | 2642 | slab_bufctl(slabp)[i] = i + 1; |
1da177e4 | 2643 | } |
b28a02de | 2644 | slab_bufctl(slabp)[i - 1] = BUFCTL_END; |
1da177e4 LT |
2645 | slabp->free = 0; |
2646 | } | |
2647 | ||
343e0d7a | 2648 | static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 2649 | { |
4b51d669 CL |
2650 | if (CONFIG_ZONE_DMA_FLAG) { |
2651 | if (flags & GFP_DMA) | |
2652 | BUG_ON(!(cachep->gfpflags & GFP_DMA)); | |
2653 | else | |
2654 | BUG_ON(cachep->gfpflags & GFP_DMA); | |
2655 | } | |
1da177e4 LT |
2656 | } |
2657 | ||
a737b3e2 AM |
2658 | static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, |
2659 | int nodeid) | |
78d382d7 | 2660 | { |
8fea4e96 | 2661 | void *objp = index_to_obj(cachep, slabp, slabp->free); |
78d382d7 MD |
2662 | kmem_bufctl_t next; |
2663 | ||
2664 | slabp->inuse++; | |
2665 | next = slab_bufctl(slabp)[slabp->free]; | |
2666 | #if DEBUG | |
2667 | slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE; | |
2668 | WARN_ON(slabp->nodeid != nodeid); | |
2669 | #endif | |
2670 | slabp->free = next; | |
2671 | ||
2672 | return objp; | |
2673 | } | |
2674 | ||
a737b3e2 AM |
2675 | static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, |
2676 | void *objp, int nodeid) | |
78d382d7 | 2677 | { |
8fea4e96 | 2678 | unsigned int objnr = obj_to_index(cachep, slabp, objp); |
78d382d7 MD |
2679 | |
2680 | #if DEBUG | |
2681 | /* Verify that the slab belongs to the intended node */ | |
2682 | WARN_ON(slabp->nodeid != nodeid); | |
2683 | ||
871751e2 | 2684 | if (slab_bufctl(slabp)[objnr] + 1 <= SLAB_LIMIT + 1) { |
78d382d7 | 2685 | printk(KERN_ERR "slab: double free detected in cache " |
a737b3e2 | 2686 | "'%s', objp %p\n", cachep->name, objp); |
78d382d7 MD |
2687 | BUG(); |
2688 | } | |
2689 | #endif | |
2690 | slab_bufctl(slabp)[objnr] = slabp->free; | |
2691 | slabp->free = objnr; | |
2692 | slabp->inuse--; | |
2693 | } | |
2694 | ||
4776874f PE |
2695 | /* |
2696 | * Map pages beginning at addr to the given cache and slab. This is required | |
2697 | * for the slab allocator to be able to lookup the cache and slab of a | |
2698 | * virtual address for kfree, ksize, kmem_ptr_validate, and slab debugging. | |
2699 | */ | |
2700 | static void slab_map_pages(struct kmem_cache *cache, struct slab *slab, | |
2701 | void *addr) | |
1da177e4 | 2702 | { |
4776874f | 2703 | int nr_pages; |
1da177e4 LT |
2704 | struct page *page; |
2705 | ||
4776874f | 2706 | page = virt_to_page(addr); |
84097518 | 2707 | |
4776874f | 2708 | nr_pages = 1; |
84097518 | 2709 | if (likely(!PageCompound(page))) |
4776874f PE |
2710 | nr_pages <<= cache->gfporder; |
2711 | ||
1da177e4 | 2712 | do { |
4776874f PE |
2713 | page_set_cache(page, cache); |
2714 | page_set_slab(page, slab); | |
1da177e4 | 2715 | page++; |
4776874f | 2716 | } while (--nr_pages); |
1da177e4 LT |
2717 | } |
2718 | ||
2719 | /* | |
2720 | * Grow (by 1) the number of slabs within a cache. This is called by | |
2721 | * kmem_cache_alloc() when there are no active objs left in a cache. | |
2722 | */ | |
3c517a61 CL |
2723 | static int cache_grow(struct kmem_cache *cachep, |
2724 | gfp_t flags, int nodeid, void *objp) | |
1da177e4 | 2725 | { |
b28a02de | 2726 | struct slab *slabp; |
b28a02de PE |
2727 | size_t offset; |
2728 | gfp_t local_flags; | |
2729 | unsigned long ctor_flags; | |
e498be7d | 2730 | struct kmem_list3 *l3; |
1da177e4 | 2731 | |
a737b3e2 AM |
2732 | /* |
2733 | * Be lazy and only check for valid flags here, keeping it out of the | |
2734 | * critical path in kmem_cache_alloc(). | |
1da177e4 | 2735 | */ |
441e143e | 2736 | BUG_ON(flags & ~(GFP_DMA | GFP_LEVEL_MASK | __GFP_NO_GROW)); |
6e0eaa4b | 2737 | if (flags & __GFP_NO_GROW) |
1da177e4 LT |
2738 | return 0; |
2739 | ||
2740 | ctor_flags = SLAB_CTOR_CONSTRUCTOR; | |
a06d72c1 | 2741 | local_flags = (flags & GFP_LEVEL_MASK); |
1da177e4 LT |
2742 | if (!(local_flags & __GFP_WAIT)) |
2743 | /* | |
2744 | * Not allowed to sleep. Need to tell a constructor about | |
2745 | * this - it might need to know... | |
2746 | */ | |
2747 | ctor_flags |= SLAB_CTOR_ATOMIC; | |
2748 | ||
2e1217cf | 2749 | /* Take the l3 list lock to change the colour_next on this node */ |
1da177e4 | 2750 | check_irq_off(); |
2e1217cf RT |
2751 | l3 = cachep->nodelists[nodeid]; |
2752 | spin_lock(&l3->list_lock); | |
1da177e4 LT |
2753 | |
2754 | /* Get colour for the slab, and cal the next value. */ | |
2e1217cf RT |
2755 | offset = l3->colour_next; |
2756 | l3->colour_next++; | |
2757 | if (l3->colour_next >= cachep->colour) | |
2758 | l3->colour_next = 0; | |
2759 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2760 | |
2e1217cf | 2761 | offset *= cachep->colour_off; |
1da177e4 LT |
2762 | |
2763 | if (local_flags & __GFP_WAIT) | |
2764 | local_irq_enable(); | |
2765 | ||
2766 | /* | |
2767 | * The test for missing atomic flag is performed here, rather than | |
2768 | * the more obvious place, simply to reduce the critical path length | |
2769 | * in kmem_cache_alloc(). If a caller is seriously mis-behaving they | |
2770 | * will eventually be caught here (where it matters). | |
2771 | */ | |
2772 | kmem_flagcheck(cachep, flags); | |
2773 | ||
a737b3e2 AM |
2774 | /* |
2775 | * Get mem for the objs. Attempt to allocate a physical page from | |
2776 | * 'nodeid'. | |
e498be7d | 2777 | */ |
3c517a61 CL |
2778 | if (!objp) |
2779 | objp = kmem_getpages(cachep, flags, nodeid); | |
a737b3e2 | 2780 | if (!objp) |
1da177e4 LT |
2781 | goto failed; |
2782 | ||
2783 | /* Get slab management. */ | |
3c517a61 CL |
2784 | slabp = alloc_slabmgmt(cachep, objp, offset, |
2785 | local_flags & ~GFP_THISNODE, nodeid); | |
a737b3e2 | 2786 | if (!slabp) |
1da177e4 LT |
2787 | goto opps1; |
2788 | ||
e498be7d | 2789 | slabp->nodeid = nodeid; |
4776874f | 2790 | slab_map_pages(cachep, slabp, objp); |
1da177e4 LT |
2791 | |
2792 | cache_init_objs(cachep, slabp, ctor_flags); | |
2793 | ||
2794 | if (local_flags & __GFP_WAIT) | |
2795 | local_irq_disable(); | |
2796 | check_irq_off(); | |
e498be7d | 2797 | spin_lock(&l3->list_lock); |
1da177e4 LT |
2798 | |
2799 | /* Make slab active. */ | |
e498be7d | 2800 | list_add_tail(&slabp->list, &(l3->slabs_free)); |
1da177e4 | 2801 | STATS_INC_GROWN(cachep); |
e498be7d CL |
2802 | l3->free_objects += cachep->num; |
2803 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2804 | return 1; |
a737b3e2 | 2805 | opps1: |
1da177e4 | 2806 | kmem_freepages(cachep, objp); |
a737b3e2 | 2807 | failed: |
1da177e4 LT |
2808 | if (local_flags & __GFP_WAIT) |
2809 | local_irq_disable(); | |
2810 | return 0; | |
2811 | } | |
2812 | ||
2813 | #if DEBUG | |
2814 | ||
2815 | /* | |
2816 | * Perform extra freeing checks: | |
2817 | * - detect bad pointers. | |
2818 | * - POISON/RED_ZONE checking | |
2819 | * - destructor calls, for caches with POISON+dtor | |
2820 | */ | |
2821 | static void kfree_debugcheck(const void *objp) | |
2822 | { | |
1da177e4 LT |
2823 | if (!virt_addr_valid(objp)) { |
2824 | printk(KERN_ERR "kfree_debugcheck: out of range ptr %lxh.\n", | |
b28a02de PE |
2825 | (unsigned long)objp); |
2826 | BUG(); | |
1da177e4 | 2827 | } |
1da177e4 LT |
2828 | } |
2829 | ||
58ce1fd5 PE |
2830 | static inline void verify_redzone_free(struct kmem_cache *cache, void *obj) |
2831 | { | |
2832 | unsigned long redzone1, redzone2; | |
2833 | ||
2834 | redzone1 = *dbg_redzone1(cache, obj); | |
2835 | redzone2 = *dbg_redzone2(cache, obj); | |
2836 | ||
2837 | /* | |
2838 | * Redzone is ok. | |
2839 | */ | |
2840 | if (redzone1 == RED_ACTIVE && redzone2 == RED_ACTIVE) | |
2841 | return; | |
2842 | ||
2843 | if (redzone1 == RED_INACTIVE && redzone2 == RED_INACTIVE) | |
2844 | slab_error(cache, "double free detected"); | |
2845 | else | |
2846 | slab_error(cache, "memory outside object was overwritten"); | |
2847 | ||
2848 | printk(KERN_ERR "%p: redzone 1:0x%lx, redzone 2:0x%lx.\n", | |
2849 | obj, redzone1, redzone2); | |
2850 | } | |
2851 | ||
343e0d7a | 2852 | static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, |
b28a02de | 2853 | void *caller) |
1da177e4 LT |
2854 | { |
2855 | struct page *page; | |
2856 | unsigned int objnr; | |
2857 | struct slab *slabp; | |
2858 | ||
3dafccf2 | 2859 | objp -= obj_offset(cachep); |
1da177e4 LT |
2860 | kfree_debugcheck(objp); |
2861 | page = virt_to_page(objp); | |
2862 | ||
065d41cb | 2863 | slabp = page_get_slab(page); |
1da177e4 LT |
2864 | |
2865 | if (cachep->flags & SLAB_RED_ZONE) { | |
58ce1fd5 | 2866 | verify_redzone_free(cachep, objp); |
1da177e4 LT |
2867 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; |
2868 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
2869 | } | |
2870 | if (cachep->flags & SLAB_STORE_USER) | |
2871 | *dbg_userword(cachep, objp) = caller; | |
2872 | ||
8fea4e96 | 2873 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 LT |
2874 | |
2875 | BUG_ON(objnr >= cachep->num); | |
8fea4e96 | 2876 | BUG_ON(objp != index_to_obj(cachep, slabp, objnr)); |
1da177e4 LT |
2877 | |
2878 | if (cachep->flags & SLAB_DEBUG_INITIAL) { | |
a737b3e2 AM |
2879 | /* |
2880 | * Need to call the slab's constructor so the caller can | |
2881 | * perform a verify of its state (debugging). Called without | |
2882 | * the cache-lock held. | |
1da177e4 | 2883 | */ |
3dafccf2 | 2884 | cachep->ctor(objp + obj_offset(cachep), |
b28a02de | 2885 | cachep, SLAB_CTOR_CONSTRUCTOR | SLAB_CTOR_VERIFY); |
1da177e4 LT |
2886 | } |
2887 | if (cachep->flags & SLAB_POISON && cachep->dtor) { | |
2888 | /* we want to cache poison the object, | |
2889 | * call the destruction callback | |
2890 | */ | |
3dafccf2 | 2891 | cachep->dtor(objp + obj_offset(cachep), cachep, 0); |
1da177e4 | 2892 | } |
871751e2 AV |
2893 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
2894 | slab_bufctl(slabp)[objnr] = BUFCTL_FREE; | |
2895 | #endif | |
1da177e4 LT |
2896 | if (cachep->flags & SLAB_POISON) { |
2897 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
a737b3e2 | 2898 | if ((cachep->buffer_size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) { |
1da177e4 | 2899 | store_stackinfo(cachep, objp, (unsigned long)caller); |
b28a02de | 2900 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 2901 | cachep->buffer_size / PAGE_SIZE, 0); |
1da177e4 LT |
2902 | } else { |
2903 | poison_obj(cachep, objp, POISON_FREE); | |
2904 | } | |
2905 | #else | |
2906 | poison_obj(cachep, objp, POISON_FREE); | |
2907 | #endif | |
2908 | } | |
2909 | return objp; | |
2910 | } | |
2911 | ||
343e0d7a | 2912 | static void check_slabp(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 LT |
2913 | { |
2914 | kmem_bufctl_t i; | |
2915 | int entries = 0; | |
b28a02de | 2916 | |
1da177e4 LT |
2917 | /* Check slab's freelist to see if this obj is there. */ |
2918 | for (i = slabp->free; i != BUFCTL_END; i = slab_bufctl(slabp)[i]) { | |
2919 | entries++; | |
2920 | if (entries > cachep->num || i >= cachep->num) | |
2921 | goto bad; | |
2922 | } | |
2923 | if (entries != cachep->num - slabp->inuse) { | |
a737b3e2 AM |
2924 | bad: |
2925 | printk(KERN_ERR "slab: Internal list corruption detected in " | |
2926 | "cache '%s'(%d), slabp %p(%d). Hexdump:\n", | |
2927 | cachep->name, cachep->num, slabp, slabp->inuse); | |
b28a02de | 2928 | for (i = 0; |
264132bc | 2929 | i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t); |
b28a02de | 2930 | i++) { |
a737b3e2 | 2931 | if (i % 16 == 0) |
1da177e4 | 2932 | printk("\n%03x:", i); |
b28a02de | 2933 | printk(" %02x", ((unsigned char *)slabp)[i]); |
1da177e4 LT |
2934 | } |
2935 | printk("\n"); | |
2936 | BUG(); | |
2937 | } | |
2938 | } | |
2939 | #else | |
2940 | #define kfree_debugcheck(x) do { } while(0) | |
2941 | #define cache_free_debugcheck(x,objp,z) (objp) | |
2942 | #define check_slabp(x,y) do { } while(0) | |
2943 | #endif | |
2944 | ||
343e0d7a | 2945 | static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 LT |
2946 | { |
2947 | int batchcount; | |
2948 | struct kmem_list3 *l3; | |
2949 | struct array_cache *ac; | |
1ca4cb24 PE |
2950 | int node; |
2951 | ||
2952 | node = numa_node_id(); | |
1da177e4 LT |
2953 | |
2954 | check_irq_off(); | |
9a2dba4b | 2955 | ac = cpu_cache_get(cachep); |
a737b3e2 | 2956 | retry: |
1da177e4 LT |
2957 | batchcount = ac->batchcount; |
2958 | if (!ac->touched && batchcount > BATCHREFILL_LIMIT) { | |
a737b3e2 AM |
2959 | /* |
2960 | * If there was little recent activity on this cache, then | |
2961 | * perform only a partial refill. Otherwise we could generate | |
2962 | * refill bouncing. | |
1da177e4 LT |
2963 | */ |
2964 | batchcount = BATCHREFILL_LIMIT; | |
2965 | } | |
1ca4cb24 | 2966 | l3 = cachep->nodelists[node]; |
e498be7d CL |
2967 | |
2968 | BUG_ON(ac->avail > 0 || !l3); | |
2969 | spin_lock(&l3->list_lock); | |
1da177e4 | 2970 | |
3ded175a CL |
2971 | /* See if we can refill from the shared array */ |
2972 | if (l3->shared && transfer_objects(ac, l3->shared, batchcount)) | |
2973 | goto alloc_done; | |
2974 | ||
1da177e4 LT |
2975 | while (batchcount > 0) { |
2976 | struct list_head *entry; | |
2977 | struct slab *slabp; | |
2978 | /* Get slab alloc is to come from. */ | |
2979 | entry = l3->slabs_partial.next; | |
2980 | if (entry == &l3->slabs_partial) { | |
2981 | l3->free_touched = 1; | |
2982 | entry = l3->slabs_free.next; | |
2983 | if (entry == &l3->slabs_free) | |
2984 | goto must_grow; | |
2985 | } | |
2986 | ||
2987 | slabp = list_entry(entry, struct slab, list); | |
2988 | check_slabp(cachep, slabp); | |
2989 | check_spinlock_acquired(cachep); | |
2990 | while (slabp->inuse < cachep->num && batchcount--) { | |
1da177e4 LT |
2991 | STATS_INC_ALLOCED(cachep); |
2992 | STATS_INC_ACTIVE(cachep); | |
2993 | STATS_SET_HIGH(cachep); | |
2994 | ||
78d382d7 | 2995 | ac->entry[ac->avail++] = slab_get_obj(cachep, slabp, |
1ca4cb24 | 2996 | node); |
1da177e4 LT |
2997 | } |
2998 | check_slabp(cachep, slabp); | |
2999 | ||
3000 | /* move slabp to correct slabp list: */ | |
3001 | list_del(&slabp->list); | |
3002 | if (slabp->free == BUFCTL_END) | |
3003 | list_add(&slabp->list, &l3->slabs_full); | |
3004 | else | |
3005 | list_add(&slabp->list, &l3->slabs_partial); | |
3006 | } | |
3007 | ||
a737b3e2 | 3008 | must_grow: |
1da177e4 | 3009 | l3->free_objects -= ac->avail; |
a737b3e2 | 3010 | alloc_done: |
e498be7d | 3011 | spin_unlock(&l3->list_lock); |
1da177e4 LT |
3012 | |
3013 | if (unlikely(!ac->avail)) { | |
3014 | int x; | |
3c517a61 | 3015 | x = cache_grow(cachep, flags | GFP_THISNODE, node, NULL); |
e498be7d | 3016 | |
a737b3e2 | 3017 | /* cache_grow can reenable interrupts, then ac could change. */ |
9a2dba4b | 3018 | ac = cpu_cache_get(cachep); |
a737b3e2 | 3019 | if (!x && ac->avail == 0) /* no objects in sight? abort */ |
1da177e4 LT |
3020 | return NULL; |
3021 | ||
a737b3e2 | 3022 | if (!ac->avail) /* objects refilled by interrupt? */ |
1da177e4 LT |
3023 | goto retry; |
3024 | } | |
3025 | ac->touched = 1; | |
e498be7d | 3026 | return ac->entry[--ac->avail]; |
1da177e4 LT |
3027 | } |
3028 | ||
a737b3e2 AM |
3029 | static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep, |
3030 | gfp_t flags) | |
1da177e4 LT |
3031 | { |
3032 | might_sleep_if(flags & __GFP_WAIT); | |
3033 | #if DEBUG | |
3034 | kmem_flagcheck(cachep, flags); | |
3035 | #endif | |
3036 | } | |
3037 | ||
3038 | #if DEBUG | |
a737b3e2 AM |
3039 | static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, |
3040 | gfp_t flags, void *objp, void *caller) | |
1da177e4 | 3041 | { |
b28a02de | 3042 | if (!objp) |
1da177e4 | 3043 | return objp; |
b28a02de | 3044 | if (cachep->flags & SLAB_POISON) { |
1da177e4 | 3045 | #ifdef CONFIG_DEBUG_PAGEALLOC |
3dafccf2 | 3046 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) |
b28a02de | 3047 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 3048 | cachep->buffer_size / PAGE_SIZE, 1); |
1da177e4 LT |
3049 | else |
3050 | check_poison_obj(cachep, objp); | |
3051 | #else | |
3052 | check_poison_obj(cachep, objp); | |
3053 | #endif | |
3054 | poison_obj(cachep, objp, POISON_INUSE); | |
3055 | } | |
3056 | if (cachep->flags & SLAB_STORE_USER) | |
3057 | *dbg_userword(cachep, objp) = caller; | |
3058 | ||
3059 | if (cachep->flags & SLAB_RED_ZONE) { | |
a737b3e2 AM |
3060 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE || |
3061 | *dbg_redzone2(cachep, objp) != RED_INACTIVE) { | |
3062 | slab_error(cachep, "double free, or memory outside" | |
3063 | " object was overwritten"); | |
b28a02de | 3064 | printk(KERN_ERR |
a737b3e2 AM |
3065 | "%p: redzone 1:0x%lx, redzone 2:0x%lx\n", |
3066 | objp, *dbg_redzone1(cachep, objp), | |
3067 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
3068 | } |
3069 | *dbg_redzone1(cachep, objp) = RED_ACTIVE; | |
3070 | *dbg_redzone2(cachep, objp) = RED_ACTIVE; | |
3071 | } | |
871751e2 AV |
3072 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
3073 | { | |
3074 | struct slab *slabp; | |
3075 | unsigned objnr; | |
3076 | ||
3077 | slabp = page_get_slab(virt_to_page(objp)); | |
3078 | objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size; | |
3079 | slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE; | |
3080 | } | |
3081 | #endif | |
3dafccf2 | 3082 | objp += obj_offset(cachep); |
1da177e4 | 3083 | if (cachep->ctor && cachep->flags & SLAB_POISON) { |
b28a02de | 3084 | unsigned long ctor_flags = SLAB_CTOR_CONSTRUCTOR; |
1da177e4 LT |
3085 | |
3086 | if (!(flags & __GFP_WAIT)) | |
3087 | ctor_flags |= SLAB_CTOR_ATOMIC; | |
3088 | ||
3089 | cachep->ctor(objp, cachep, ctor_flags); | |
b28a02de | 3090 | } |
a44b56d3 KH |
3091 | #if ARCH_SLAB_MINALIGN |
3092 | if ((u32)objp & (ARCH_SLAB_MINALIGN-1)) { | |
3093 | printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n", | |
3094 | objp, ARCH_SLAB_MINALIGN); | |
3095 | } | |
3096 | #endif | |
1da177e4 LT |
3097 | return objp; |
3098 | } | |
3099 | #else | |
3100 | #define cache_alloc_debugcheck_after(a,b,objp,d) (objp) | |
3101 | #endif | |
3102 | ||
8a8b6502 AM |
3103 | #ifdef CONFIG_FAILSLAB |
3104 | ||
3105 | static struct failslab_attr { | |
3106 | ||
3107 | struct fault_attr attr; | |
3108 | ||
3109 | u32 ignore_gfp_wait; | |
3110 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
3111 | struct dentry *ignore_gfp_wait_file; | |
3112 | #endif | |
3113 | ||
3114 | } failslab = { | |
3115 | .attr = FAULT_ATTR_INITIALIZER, | |
6b1b60f4 | 3116 | .ignore_gfp_wait = 1, |
8a8b6502 AM |
3117 | }; |
3118 | ||
3119 | static int __init setup_failslab(char *str) | |
3120 | { | |
3121 | return setup_fault_attr(&failslab.attr, str); | |
3122 | } | |
3123 | __setup("failslab=", setup_failslab); | |
3124 | ||
3125 | static int should_failslab(struct kmem_cache *cachep, gfp_t flags) | |
3126 | { | |
3127 | if (cachep == &cache_cache) | |
3128 | return 0; | |
3129 | if (flags & __GFP_NOFAIL) | |
3130 | return 0; | |
3131 | if (failslab.ignore_gfp_wait && (flags & __GFP_WAIT)) | |
3132 | return 0; | |
3133 | ||
3134 | return should_fail(&failslab.attr, obj_size(cachep)); | |
3135 | } | |
3136 | ||
3137 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
3138 | ||
3139 | static int __init failslab_debugfs(void) | |
3140 | { | |
3141 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
3142 | struct dentry *dir; | |
3143 | int err; | |
3144 | ||
3145 | err = init_fault_attr_dentries(&failslab.attr, "failslab"); | |
3146 | if (err) | |
3147 | return err; | |
3148 | dir = failslab.attr.dentries.dir; | |
3149 | ||
3150 | failslab.ignore_gfp_wait_file = | |
3151 | debugfs_create_bool("ignore-gfp-wait", mode, dir, | |
3152 | &failslab.ignore_gfp_wait); | |
3153 | ||
3154 | if (!failslab.ignore_gfp_wait_file) { | |
3155 | err = -ENOMEM; | |
3156 | debugfs_remove(failslab.ignore_gfp_wait_file); | |
3157 | cleanup_fault_attr_dentries(&failslab.attr); | |
3158 | } | |
3159 | ||
3160 | return err; | |
3161 | } | |
3162 | ||
3163 | late_initcall(failslab_debugfs); | |
3164 | ||
3165 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
3166 | ||
3167 | #else /* CONFIG_FAILSLAB */ | |
3168 | ||
3169 | static inline int should_failslab(struct kmem_cache *cachep, gfp_t flags) | |
3170 | { | |
3171 | return 0; | |
3172 | } | |
3173 | ||
3174 | #endif /* CONFIG_FAILSLAB */ | |
3175 | ||
343e0d7a | 3176 | static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 3177 | { |
b28a02de | 3178 | void *objp; |
1da177e4 LT |
3179 | struct array_cache *ac; |
3180 | ||
5c382300 | 3181 | check_irq_off(); |
8a8b6502 AM |
3182 | |
3183 | if (should_failslab(cachep, flags)) | |
3184 | return NULL; | |
3185 | ||
9a2dba4b | 3186 | ac = cpu_cache_get(cachep); |
1da177e4 LT |
3187 | if (likely(ac->avail)) { |
3188 | STATS_INC_ALLOCHIT(cachep); | |
3189 | ac->touched = 1; | |
e498be7d | 3190 | objp = ac->entry[--ac->avail]; |
1da177e4 LT |
3191 | } else { |
3192 | STATS_INC_ALLOCMISS(cachep); | |
3193 | objp = cache_alloc_refill(cachep, flags); | |
3194 | } | |
5c382300 AK |
3195 | return objp; |
3196 | } | |
3197 | ||
e498be7d | 3198 | #ifdef CONFIG_NUMA |
c61afb18 | 3199 | /* |
b2455396 | 3200 | * Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY. |
c61afb18 PJ |
3201 | * |
3202 | * If we are in_interrupt, then process context, including cpusets and | |
3203 | * mempolicy, may not apply and should not be used for allocation policy. | |
3204 | */ | |
3205 | static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) | |
3206 | { | |
3207 | int nid_alloc, nid_here; | |
3208 | ||
765c4507 | 3209 | if (in_interrupt() || (flags & __GFP_THISNODE)) |
c61afb18 PJ |
3210 | return NULL; |
3211 | nid_alloc = nid_here = numa_node_id(); | |
3212 | if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD)) | |
3213 | nid_alloc = cpuset_mem_spread_node(); | |
3214 | else if (current->mempolicy) | |
3215 | nid_alloc = slab_node(current->mempolicy); | |
3216 | if (nid_alloc != nid_here) | |
8b98c169 | 3217 | return ____cache_alloc_node(cachep, flags, nid_alloc); |
c61afb18 PJ |
3218 | return NULL; |
3219 | } | |
3220 | ||
765c4507 CL |
3221 | /* |
3222 | * Fallback function if there was no memory available and no objects on a | |
3c517a61 CL |
3223 | * certain node and fall back is permitted. First we scan all the |
3224 | * available nodelists for available objects. If that fails then we | |
3225 | * perform an allocation without specifying a node. This allows the page | |
3226 | * allocator to do its reclaim / fallback magic. We then insert the | |
3227 | * slab into the proper nodelist and then allocate from it. | |
765c4507 | 3228 | */ |
8c8cc2c1 | 3229 | static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) |
765c4507 | 3230 | { |
8c8cc2c1 PE |
3231 | struct zonelist *zonelist; |
3232 | gfp_t local_flags; | |
765c4507 CL |
3233 | struct zone **z; |
3234 | void *obj = NULL; | |
3c517a61 | 3235 | int nid; |
8c8cc2c1 PE |
3236 | |
3237 | if (flags & __GFP_THISNODE) | |
3238 | return NULL; | |
3239 | ||
3240 | zonelist = &NODE_DATA(slab_node(current->mempolicy)) | |
3241 | ->node_zonelists[gfp_zone(flags)]; | |
3242 | local_flags = (flags & GFP_LEVEL_MASK); | |
765c4507 | 3243 | |
3c517a61 CL |
3244 | retry: |
3245 | /* | |
3246 | * Look through allowed nodes for objects available | |
3247 | * from existing per node queues. | |
3248 | */ | |
aedb0eb1 | 3249 | for (z = zonelist->zones; *z && !obj; z++) { |
3c517a61 | 3250 | nid = zone_to_nid(*z); |
aedb0eb1 | 3251 | |
02a0e53d | 3252 | if (cpuset_zone_allowed_hardwall(*z, flags) && |
3c517a61 CL |
3253 | cache->nodelists[nid] && |
3254 | cache->nodelists[nid]->free_objects) | |
3255 | obj = ____cache_alloc_node(cache, | |
3256 | flags | GFP_THISNODE, nid); | |
3257 | } | |
3258 | ||
b6a60451 | 3259 | if (!obj && !(flags & __GFP_NO_GROW)) { |
3c517a61 CL |
3260 | /* |
3261 | * This allocation will be performed within the constraints | |
3262 | * of the current cpuset / memory policy requirements. | |
3263 | * We may trigger various forms of reclaim on the allowed | |
3264 | * set and go into memory reserves if necessary. | |
3265 | */ | |
dd47ea75 CL |
3266 | if (local_flags & __GFP_WAIT) |
3267 | local_irq_enable(); | |
3268 | kmem_flagcheck(cache, flags); | |
3c517a61 | 3269 | obj = kmem_getpages(cache, flags, -1); |
dd47ea75 CL |
3270 | if (local_flags & __GFP_WAIT) |
3271 | local_irq_disable(); | |
3c517a61 CL |
3272 | if (obj) { |
3273 | /* | |
3274 | * Insert into the appropriate per node queues | |
3275 | */ | |
3276 | nid = page_to_nid(virt_to_page(obj)); | |
3277 | if (cache_grow(cache, flags, nid, obj)) { | |
3278 | obj = ____cache_alloc_node(cache, | |
3279 | flags | GFP_THISNODE, nid); | |
3280 | if (!obj) | |
3281 | /* | |
3282 | * Another processor may allocate the | |
3283 | * objects in the slab since we are | |
3284 | * not holding any locks. | |
3285 | */ | |
3286 | goto retry; | |
3287 | } else { | |
b6a60451 | 3288 | /* cache_grow already freed obj */ |
3c517a61 CL |
3289 | obj = NULL; |
3290 | } | |
3291 | } | |
aedb0eb1 | 3292 | } |
765c4507 CL |
3293 | return obj; |
3294 | } | |
3295 | ||
e498be7d CL |
3296 | /* |
3297 | * A interface to enable slab creation on nodeid | |
1da177e4 | 3298 | */ |
8b98c169 | 3299 | static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, |
a737b3e2 | 3300 | int nodeid) |
e498be7d CL |
3301 | { |
3302 | struct list_head *entry; | |
b28a02de PE |
3303 | struct slab *slabp; |
3304 | struct kmem_list3 *l3; | |
3305 | void *obj; | |
b28a02de PE |
3306 | int x; |
3307 | ||
3308 | l3 = cachep->nodelists[nodeid]; | |
3309 | BUG_ON(!l3); | |
3310 | ||
a737b3e2 | 3311 | retry: |
ca3b9b91 | 3312 | check_irq_off(); |
b28a02de PE |
3313 | spin_lock(&l3->list_lock); |
3314 | entry = l3->slabs_partial.next; | |
3315 | if (entry == &l3->slabs_partial) { | |
3316 | l3->free_touched = 1; | |
3317 | entry = l3->slabs_free.next; | |
3318 | if (entry == &l3->slabs_free) | |
3319 | goto must_grow; | |
3320 | } | |
3321 | ||
3322 | slabp = list_entry(entry, struct slab, list); | |
3323 | check_spinlock_acquired_node(cachep, nodeid); | |
3324 | check_slabp(cachep, slabp); | |
3325 | ||
3326 | STATS_INC_NODEALLOCS(cachep); | |
3327 | STATS_INC_ACTIVE(cachep); | |
3328 | STATS_SET_HIGH(cachep); | |
3329 | ||
3330 | BUG_ON(slabp->inuse == cachep->num); | |
3331 | ||
78d382d7 | 3332 | obj = slab_get_obj(cachep, slabp, nodeid); |
b28a02de PE |
3333 | check_slabp(cachep, slabp); |
3334 | l3->free_objects--; | |
3335 | /* move slabp to correct slabp list: */ | |
3336 | list_del(&slabp->list); | |
3337 | ||
a737b3e2 | 3338 | if (slabp->free == BUFCTL_END) |
b28a02de | 3339 | list_add(&slabp->list, &l3->slabs_full); |
a737b3e2 | 3340 | else |
b28a02de | 3341 | list_add(&slabp->list, &l3->slabs_partial); |
e498be7d | 3342 | |
b28a02de PE |
3343 | spin_unlock(&l3->list_lock); |
3344 | goto done; | |
e498be7d | 3345 | |
a737b3e2 | 3346 | must_grow: |
b28a02de | 3347 | spin_unlock(&l3->list_lock); |
3c517a61 | 3348 | x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL); |
765c4507 CL |
3349 | if (x) |
3350 | goto retry; | |
1da177e4 | 3351 | |
8c8cc2c1 | 3352 | return fallback_alloc(cachep, flags); |
e498be7d | 3353 | |
a737b3e2 | 3354 | done: |
b28a02de | 3355 | return obj; |
e498be7d | 3356 | } |
8c8cc2c1 PE |
3357 | |
3358 | /** | |
3359 | * kmem_cache_alloc_node - Allocate an object on the specified node | |
3360 | * @cachep: The cache to allocate from. | |
3361 | * @flags: See kmalloc(). | |
3362 | * @nodeid: node number of the target node. | |
3363 | * @caller: return address of caller, used for debug information | |
3364 | * | |
3365 | * Identical to kmem_cache_alloc but it will allocate memory on the given | |
3366 | * node, which can improve the performance for cpu bound structures. | |
3367 | * | |
3368 | * Fallback to other node is possible if __GFP_THISNODE is not set. | |
3369 | */ | |
3370 | static __always_inline void * | |
3371 | __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid, | |
3372 | void *caller) | |
3373 | { | |
3374 | unsigned long save_flags; | |
3375 | void *ptr; | |
3376 | ||
3377 | cache_alloc_debugcheck_before(cachep, flags); | |
3378 | local_irq_save(save_flags); | |
3379 | ||
3380 | if (unlikely(nodeid == -1)) | |
3381 | nodeid = numa_node_id(); | |
3382 | ||
3383 | if (unlikely(!cachep->nodelists[nodeid])) { | |
3384 | /* Node not bootstrapped yet */ | |
3385 | ptr = fallback_alloc(cachep, flags); | |
3386 | goto out; | |
3387 | } | |
3388 | ||
3389 | if (nodeid == numa_node_id()) { | |
3390 | /* | |
3391 | * Use the locally cached objects if possible. | |
3392 | * However ____cache_alloc does not allow fallback | |
3393 | * to other nodes. It may fail while we still have | |
3394 | * objects on other nodes available. | |
3395 | */ | |
3396 | ptr = ____cache_alloc(cachep, flags); | |
3397 | if (ptr) | |
3398 | goto out; | |
3399 | } | |
3400 | /* ___cache_alloc_node can fall back to other nodes */ | |
3401 | ptr = ____cache_alloc_node(cachep, flags, nodeid); | |
3402 | out: | |
3403 | local_irq_restore(save_flags); | |
3404 | ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller); | |
3405 | ||
3406 | return ptr; | |
3407 | } | |
3408 | ||
3409 | static __always_inline void * | |
3410 | __do_cache_alloc(struct kmem_cache *cache, gfp_t flags) | |
3411 | { | |
3412 | void *objp; | |
3413 | ||
3414 | if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { | |
3415 | objp = alternate_node_alloc(cache, flags); | |
3416 | if (objp) | |
3417 | goto out; | |
3418 | } | |
3419 | objp = ____cache_alloc(cache, flags); | |
3420 | ||
3421 | /* | |
3422 | * We may just have run out of memory on the local node. | |
3423 | * ____cache_alloc_node() knows how to locate memory on other nodes | |
3424 | */ | |
3425 | if (!objp) | |
3426 | objp = ____cache_alloc_node(cache, flags, numa_node_id()); | |
3427 | ||
3428 | out: | |
3429 | return objp; | |
3430 | } | |
3431 | #else | |
3432 | ||
3433 | static __always_inline void * | |
3434 | __do_cache_alloc(struct kmem_cache *cachep, gfp_t flags) | |
3435 | { | |
3436 | return ____cache_alloc(cachep, flags); | |
3437 | } | |
3438 | ||
3439 | #endif /* CONFIG_NUMA */ | |
3440 | ||
3441 | static __always_inline void * | |
3442 | __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller) | |
3443 | { | |
3444 | unsigned long save_flags; | |
3445 | void *objp; | |
3446 | ||
3447 | cache_alloc_debugcheck_before(cachep, flags); | |
3448 | local_irq_save(save_flags); | |
3449 | objp = __do_cache_alloc(cachep, flags); | |
3450 | local_irq_restore(save_flags); | |
3451 | objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); | |
3452 | prefetchw(objp); | |
3453 | ||
3454 | return objp; | |
3455 | } | |
e498be7d CL |
3456 | |
3457 | /* | |
3458 | * Caller needs to acquire correct kmem_list's list_lock | |
3459 | */ | |
343e0d7a | 3460 | static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, |
b28a02de | 3461 | int node) |
1da177e4 LT |
3462 | { |
3463 | int i; | |
e498be7d | 3464 | struct kmem_list3 *l3; |
1da177e4 LT |
3465 | |
3466 | for (i = 0; i < nr_objects; i++) { | |
3467 | void *objp = objpp[i]; | |
3468 | struct slab *slabp; | |
1da177e4 | 3469 | |
6ed5eb22 | 3470 | slabp = virt_to_slab(objp); |
ff69416e | 3471 | l3 = cachep->nodelists[node]; |
1da177e4 | 3472 | list_del(&slabp->list); |
ff69416e | 3473 | check_spinlock_acquired_node(cachep, node); |
1da177e4 | 3474 | check_slabp(cachep, slabp); |
78d382d7 | 3475 | slab_put_obj(cachep, slabp, objp, node); |
1da177e4 | 3476 | STATS_DEC_ACTIVE(cachep); |
e498be7d | 3477 | l3->free_objects++; |
1da177e4 LT |
3478 | check_slabp(cachep, slabp); |
3479 | ||
3480 | /* fixup slab chains */ | |
3481 | if (slabp->inuse == 0) { | |
e498be7d CL |
3482 | if (l3->free_objects > l3->free_limit) { |
3483 | l3->free_objects -= cachep->num; | |
e5ac9c5a RT |
3484 | /* No need to drop any previously held |
3485 | * lock here, even if we have a off-slab slab | |
3486 | * descriptor it is guaranteed to come from | |
3487 | * a different cache, refer to comments before | |
3488 | * alloc_slabmgmt. | |
3489 | */ | |
1da177e4 LT |
3490 | slab_destroy(cachep, slabp); |
3491 | } else { | |
e498be7d | 3492 | list_add(&slabp->list, &l3->slabs_free); |
1da177e4 LT |
3493 | } |
3494 | } else { | |
3495 | /* Unconditionally move a slab to the end of the | |
3496 | * partial list on free - maximum time for the | |
3497 | * other objects to be freed, too. | |
3498 | */ | |
e498be7d | 3499 | list_add_tail(&slabp->list, &l3->slabs_partial); |
1da177e4 LT |
3500 | } |
3501 | } | |
3502 | } | |
3503 | ||
343e0d7a | 3504 | static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) |
1da177e4 LT |
3505 | { |
3506 | int batchcount; | |
e498be7d | 3507 | struct kmem_list3 *l3; |
ff69416e | 3508 | int node = numa_node_id(); |
1da177e4 LT |
3509 | |
3510 | batchcount = ac->batchcount; | |
3511 | #if DEBUG | |
3512 | BUG_ON(!batchcount || batchcount > ac->avail); | |
3513 | #endif | |
3514 | check_irq_off(); | |
ff69416e | 3515 | l3 = cachep->nodelists[node]; |
873623df | 3516 | spin_lock(&l3->list_lock); |
e498be7d CL |
3517 | if (l3->shared) { |
3518 | struct array_cache *shared_array = l3->shared; | |
b28a02de | 3519 | int max = shared_array->limit - shared_array->avail; |
1da177e4 LT |
3520 | if (max) { |
3521 | if (batchcount > max) | |
3522 | batchcount = max; | |
e498be7d | 3523 | memcpy(&(shared_array->entry[shared_array->avail]), |
b28a02de | 3524 | ac->entry, sizeof(void *) * batchcount); |
1da177e4 LT |
3525 | shared_array->avail += batchcount; |
3526 | goto free_done; | |
3527 | } | |
3528 | } | |
3529 | ||
ff69416e | 3530 | free_block(cachep, ac->entry, batchcount, node); |
a737b3e2 | 3531 | free_done: |
1da177e4 LT |
3532 | #if STATS |
3533 | { | |
3534 | int i = 0; | |
3535 | struct list_head *p; | |
3536 | ||
e498be7d CL |
3537 | p = l3->slabs_free.next; |
3538 | while (p != &(l3->slabs_free)) { | |
1da177e4 LT |
3539 | struct slab *slabp; |
3540 | ||
3541 | slabp = list_entry(p, struct slab, list); | |
3542 | BUG_ON(slabp->inuse); | |
3543 | ||
3544 | i++; | |
3545 | p = p->next; | |
3546 | } | |
3547 | STATS_SET_FREEABLE(cachep, i); | |
3548 | } | |
3549 | #endif | |
e498be7d | 3550 | spin_unlock(&l3->list_lock); |
1da177e4 | 3551 | ac->avail -= batchcount; |
a737b3e2 | 3552 | memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail); |
1da177e4 LT |
3553 | } |
3554 | ||
3555 | /* | |
a737b3e2 AM |
3556 | * Release an obj back to its cache. If the obj has a constructed state, it must |
3557 | * be in this state _before_ it is released. Called with disabled ints. | |
1da177e4 | 3558 | */ |
873623df | 3559 | static inline void __cache_free(struct kmem_cache *cachep, void *objp) |
1da177e4 | 3560 | { |
9a2dba4b | 3561 | struct array_cache *ac = cpu_cache_get(cachep); |
1da177e4 LT |
3562 | |
3563 | check_irq_off(); | |
3564 | objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0)); | |
3565 | ||
873623df | 3566 | if (cache_free_alien(cachep, objp)) |
729bd0b7 PE |
3567 | return; |
3568 | ||
1da177e4 LT |
3569 | if (likely(ac->avail < ac->limit)) { |
3570 | STATS_INC_FREEHIT(cachep); | |
e498be7d | 3571 | ac->entry[ac->avail++] = objp; |
1da177e4 LT |
3572 | return; |
3573 | } else { | |
3574 | STATS_INC_FREEMISS(cachep); | |
3575 | cache_flusharray(cachep, ac); | |
e498be7d | 3576 | ac->entry[ac->avail++] = objp; |
1da177e4 LT |
3577 | } |
3578 | } | |
3579 | ||
3580 | /** | |
3581 | * kmem_cache_alloc - Allocate an object | |
3582 | * @cachep: The cache to allocate from. | |
3583 | * @flags: See kmalloc(). | |
3584 | * | |
3585 | * Allocate an object from this cache. The flags are only relevant | |
3586 | * if the cache has no available objects. | |
3587 | */ | |
343e0d7a | 3588 | void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 3589 | { |
7fd6b141 | 3590 | return __cache_alloc(cachep, flags, __builtin_return_address(0)); |
1da177e4 LT |
3591 | } |
3592 | EXPORT_SYMBOL(kmem_cache_alloc); | |
3593 | ||
a8c0f9a4 | 3594 | /** |
b8008b2b | 3595 | * kmem_cache_zalloc - Allocate an object. The memory is set to zero. |
a8c0f9a4 PE |
3596 | * @cache: The cache to allocate from. |
3597 | * @flags: See kmalloc(). | |
3598 | * | |
3599 | * Allocate an object from this cache and set the allocated memory to zero. | |
3600 | * The flags are only relevant if the cache has no available objects. | |
3601 | */ | |
3602 | void *kmem_cache_zalloc(struct kmem_cache *cache, gfp_t flags) | |
3603 | { | |
3604 | void *ret = __cache_alloc(cache, flags, __builtin_return_address(0)); | |
3605 | if (ret) | |
3606 | memset(ret, 0, obj_size(cache)); | |
3607 | return ret; | |
3608 | } | |
3609 | EXPORT_SYMBOL(kmem_cache_zalloc); | |
3610 | ||
1da177e4 LT |
3611 | /** |
3612 | * kmem_ptr_validate - check if an untrusted pointer might | |
3613 | * be a slab entry. | |
3614 | * @cachep: the cache we're checking against | |
3615 | * @ptr: pointer to validate | |
3616 | * | |
3617 | * This verifies that the untrusted pointer looks sane: | |
3618 | * it is _not_ a guarantee that the pointer is actually | |
3619 | * part of the slab cache in question, but it at least | |
3620 | * validates that the pointer can be dereferenced and | |
3621 | * looks half-way sane. | |
3622 | * | |
3623 | * Currently only used for dentry validation. | |
3624 | */ | |
b7f869a2 | 3625 | int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr) |
1da177e4 | 3626 | { |
b28a02de | 3627 | unsigned long addr = (unsigned long)ptr; |
1da177e4 | 3628 | unsigned long min_addr = PAGE_OFFSET; |
b28a02de | 3629 | unsigned long align_mask = BYTES_PER_WORD - 1; |
3dafccf2 | 3630 | unsigned long size = cachep->buffer_size; |
1da177e4 LT |
3631 | struct page *page; |
3632 | ||
3633 | if (unlikely(addr < min_addr)) | |
3634 | goto out; | |
3635 | if (unlikely(addr > (unsigned long)high_memory - size)) | |
3636 | goto out; | |
3637 | if (unlikely(addr & align_mask)) | |
3638 | goto out; | |
3639 | if (unlikely(!kern_addr_valid(addr))) | |
3640 | goto out; | |
3641 | if (unlikely(!kern_addr_valid(addr + size - 1))) | |
3642 | goto out; | |
3643 | page = virt_to_page(ptr); | |
3644 | if (unlikely(!PageSlab(page))) | |
3645 | goto out; | |
065d41cb | 3646 | if (unlikely(page_get_cache(page) != cachep)) |
1da177e4 LT |
3647 | goto out; |
3648 | return 1; | |
a737b3e2 | 3649 | out: |
1da177e4 LT |
3650 | return 0; |
3651 | } | |
3652 | ||
3653 | #ifdef CONFIG_NUMA | |
8b98c169 CH |
3654 | void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
3655 | { | |
3656 | return __cache_alloc_node(cachep, flags, nodeid, | |
3657 | __builtin_return_address(0)); | |
3658 | } | |
1da177e4 LT |
3659 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
3660 | ||
8b98c169 CH |
3661 | static __always_inline void * |
3662 | __do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller) | |
97e2bde4 | 3663 | { |
343e0d7a | 3664 | struct kmem_cache *cachep; |
97e2bde4 MS |
3665 | |
3666 | cachep = kmem_find_general_cachep(size, flags); | |
3667 | if (unlikely(cachep == NULL)) | |
3668 | return NULL; | |
3669 | return kmem_cache_alloc_node(cachep, flags, node); | |
3670 | } | |
8b98c169 CH |
3671 | |
3672 | #ifdef CONFIG_DEBUG_SLAB | |
3673 | void *__kmalloc_node(size_t size, gfp_t flags, int node) | |
3674 | { | |
3675 | return __do_kmalloc_node(size, flags, node, | |
3676 | __builtin_return_address(0)); | |
3677 | } | |
dbe5e69d | 3678 | EXPORT_SYMBOL(__kmalloc_node); |
8b98c169 CH |
3679 | |
3680 | void *__kmalloc_node_track_caller(size_t size, gfp_t flags, | |
3681 | int node, void *caller) | |
3682 | { | |
3683 | return __do_kmalloc_node(size, flags, node, caller); | |
3684 | } | |
3685 | EXPORT_SYMBOL(__kmalloc_node_track_caller); | |
3686 | #else | |
3687 | void *__kmalloc_node(size_t size, gfp_t flags, int node) | |
3688 | { | |
3689 | return __do_kmalloc_node(size, flags, node, NULL); | |
3690 | } | |
3691 | EXPORT_SYMBOL(__kmalloc_node); | |
3692 | #endif /* CONFIG_DEBUG_SLAB */ | |
3693 | #endif /* CONFIG_NUMA */ | |
1da177e4 LT |
3694 | |
3695 | /** | |
800590f5 | 3696 | * __do_kmalloc - allocate memory |
1da177e4 | 3697 | * @size: how many bytes of memory are required. |
800590f5 | 3698 | * @flags: the type of memory to allocate (see kmalloc). |
911851e6 | 3699 | * @caller: function caller for debug tracking of the caller |
1da177e4 | 3700 | */ |
7fd6b141 PE |
3701 | static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, |
3702 | void *caller) | |
1da177e4 | 3703 | { |
343e0d7a | 3704 | struct kmem_cache *cachep; |
1da177e4 | 3705 | |
97e2bde4 MS |
3706 | /* If you want to save a few bytes .text space: replace |
3707 | * __ with kmem_. | |
3708 | * Then kmalloc uses the uninlined functions instead of the inline | |
3709 | * functions. | |
3710 | */ | |
3711 | cachep = __find_general_cachep(size, flags); | |
dbdb9045 AM |
3712 | if (unlikely(cachep == NULL)) |
3713 | return NULL; | |
7fd6b141 PE |
3714 | return __cache_alloc(cachep, flags, caller); |
3715 | } | |
3716 | ||
7fd6b141 | 3717 | |
1d2c8eea | 3718 | #ifdef CONFIG_DEBUG_SLAB |
7fd6b141 PE |
3719 | void *__kmalloc(size_t size, gfp_t flags) |
3720 | { | |
871751e2 | 3721 | return __do_kmalloc(size, flags, __builtin_return_address(0)); |
1da177e4 LT |
3722 | } |
3723 | EXPORT_SYMBOL(__kmalloc); | |
3724 | ||
7fd6b141 PE |
3725 | void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller) |
3726 | { | |
3727 | return __do_kmalloc(size, flags, caller); | |
3728 | } | |
3729 | EXPORT_SYMBOL(__kmalloc_track_caller); | |
1d2c8eea CH |
3730 | |
3731 | #else | |
3732 | void *__kmalloc(size_t size, gfp_t flags) | |
3733 | { | |
3734 | return __do_kmalloc(size, flags, NULL); | |
3735 | } | |
3736 | EXPORT_SYMBOL(__kmalloc); | |
7fd6b141 PE |
3737 | #endif |
3738 | ||
1da177e4 LT |
3739 | /** |
3740 | * kmem_cache_free - Deallocate an object | |
3741 | * @cachep: The cache the allocation was from. | |
3742 | * @objp: The previously allocated object. | |
3743 | * | |
3744 | * Free an object which was previously allocated from this | |
3745 | * cache. | |
3746 | */ | |
343e0d7a | 3747 | void kmem_cache_free(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
3748 | { |
3749 | unsigned long flags; | |
3750 | ||
ddc2e812 PE |
3751 | BUG_ON(virt_to_cache(objp) != cachep); |
3752 | ||
1da177e4 | 3753 | local_irq_save(flags); |
898552c9 | 3754 | debug_check_no_locks_freed(objp, obj_size(cachep)); |
873623df | 3755 | __cache_free(cachep, objp); |
1da177e4 LT |
3756 | local_irq_restore(flags); |
3757 | } | |
3758 | EXPORT_SYMBOL(kmem_cache_free); | |
3759 | ||
1da177e4 LT |
3760 | /** |
3761 | * kfree - free previously allocated memory | |
3762 | * @objp: pointer returned by kmalloc. | |
3763 | * | |
80e93eff PE |
3764 | * If @objp is NULL, no operation is performed. |
3765 | * | |
1da177e4 LT |
3766 | * Don't free memory not originally allocated by kmalloc() |
3767 | * or you will run into trouble. | |
3768 | */ | |
3769 | void kfree(const void *objp) | |
3770 | { | |
343e0d7a | 3771 | struct kmem_cache *c; |
1da177e4 LT |
3772 | unsigned long flags; |
3773 | ||
3774 | if (unlikely(!objp)) | |
3775 | return; | |
3776 | local_irq_save(flags); | |
3777 | kfree_debugcheck(objp); | |
6ed5eb22 | 3778 | c = virt_to_cache(objp); |
f9b8404c | 3779 | debug_check_no_locks_freed(objp, obj_size(c)); |
873623df | 3780 | __cache_free(c, (void *)objp); |
1da177e4 LT |
3781 | local_irq_restore(flags); |
3782 | } | |
3783 | EXPORT_SYMBOL(kfree); | |
3784 | ||
343e0d7a | 3785 | unsigned int kmem_cache_size(struct kmem_cache *cachep) |
1da177e4 | 3786 | { |
3dafccf2 | 3787 | return obj_size(cachep); |
1da177e4 LT |
3788 | } |
3789 | EXPORT_SYMBOL(kmem_cache_size); | |
3790 | ||
343e0d7a | 3791 | const char *kmem_cache_name(struct kmem_cache *cachep) |
1944972d ACM |
3792 | { |
3793 | return cachep->name; | |
3794 | } | |
3795 | EXPORT_SYMBOL_GPL(kmem_cache_name); | |
3796 | ||
e498be7d | 3797 | /* |
0718dc2a | 3798 | * This initializes kmem_list3 or resizes varioius caches for all nodes. |
e498be7d | 3799 | */ |
343e0d7a | 3800 | static int alloc_kmemlist(struct kmem_cache *cachep) |
e498be7d CL |
3801 | { |
3802 | int node; | |
3803 | struct kmem_list3 *l3; | |
cafeb02e | 3804 | struct array_cache *new_shared; |
3395ee05 | 3805 | struct array_cache **new_alien = NULL; |
e498be7d CL |
3806 | |
3807 | for_each_online_node(node) { | |
cafeb02e | 3808 | |
3395ee05 PM |
3809 | if (use_alien_caches) { |
3810 | new_alien = alloc_alien_cache(node, cachep->limit); | |
3811 | if (!new_alien) | |
3812 | goto fail; | |
3813 | } | |
cafeb02e | 3814 | |
0718dc2a CL |
3815 | new_shared = alloc_arraycache(node, |
3816 | cachep->shared*cachep->batchcount, | |
a737b3e2 | 3817 | 0xbaadf00d); |
0718dc2a CL |
3818 | if (!new_shared) { |
3819 | free_alien_cache(new_alien); | |
e498be7d | 3820 | goto fail; |
0718dc2a | 3821 | } |
cafeb02e | 3822 | |
a737b3e2 AM |
3823 | l3 = cachep->nodelists[node]; |
3824 | if (l3) { | |
cafeb02e CL |
3825 | struct array_cache *shared = l3->shared; |
3826 | ||
e498be7d CL |
3827 | spin_lock_irq(&l3->list_lock); |
3828 | ||
cafeb02e | 3829 | if (shared) |
0718dc2a CL |
3830 | free_block(cachep, shared->entry, |
3831 | shared->avail, node); | |
e498be7d | 3832 | |
cafeb02e CL |
3833 | l3->shared = new_shared; |
3834 | if (!l3->alien) { | |
e498be7d CL |
3835 | l3->alien = new_alien; |
3836 | new_alien = NULL; | |
3837 | } | |
b28a02de | 3838 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 3839 | cachep->batchcount + cachep->num; |
e498be7d | 3840 | spin_unlock_irq(&l3->list_lock); |
cafeb02e | 3841 | kfree(shared); |
e498be7d CL |
3842 | free_alien_cache(new_alien); |
3843 | continue; | |
3844 | } | |
a737b3e2 | 3845 | l3 = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, node); |
0718dc2a CL |
3846 | if (!l3) { |
3847 | free_alien_cache(new_alien); | |
3848 | kfree(new_shared); | |
e498be7d | 3849 | goto fail; |
0718dc2a | 3850 | } |
e498be7d CL |
3851 | |
3852 | kmem_list3_init(l3); | |
3853 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
a737b3e2 | 3854 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
cafeb02e | 3855 | l3->shared = new_shared; |
e498be7d | 3856 | l3->alien = new_alien; |
b28a02de | 3857 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 3858 | cachep->batchcount + cachep->num; |
e498be7d CL |
3859 | cachep->nodelists[node] = l3; |
3860 | } | |
cafeb02e | 3861 | return 0; |
0718dc2a | 3862 | |
a737b3e2 | 3863 | fail: |
0718dc2a CL |
3864 | if (!cachep->next.next) { |
3865 | /* Cache is not active yet. Roll back what we did */ | |
3866 | node--; | |
3867 | while (node >= 0) { | |
3868 | if (cachep->nodelists[node]) { | |
3869 | l3 = cachep->nodelists[node]; | |
3870 | ||
3871 | kfree(l3->shared); | |
3872 | free_alien_cache(l3->alien); | |
3873 | kfree(l3); | |
3874 | cachep->nodelists[node] = NULL; | |
3875 | } | |
3876 | node--; | |
3877 | } | |
3878 | } | |
cafeb02e | 3879 | return -ENOMEM; |
e498be7d CL |
3880 | } |
3881 | ||
1da177e4 | 3882 | struct ccupdate_struct { |
343e0d7a | 3883 | struct kmem_cache *cachep; |
1da177e4 LT |
3884 | struct array_cache *new[NR_CPUS]; |
3885 | }; | |
3886 | ||
3887 | static void do_ccupdate_local(void *info) | |
3888 | { | |
a737b3e2 | 3889 | struct ccupdate_struct *new = info; |
1da177e4 LT |
3890 | struct array_cache *old; |
3891 | ||
3892 | check_irq_off(); | |
9a2dba4b | 3893 | old = cpu_cache_get(new->cachep); |
e498be7d | 3894 | |
1da177e4 LT |
3895 | new->cachep->array[smp_processor_id()] = new->new[smp_processor_id()]; |
3896 | new->new[smp_processor_id()] = old; | |
3897 | } | |
3898 | ||
b5d8ca7c | 3899 | /* Always called with the cache_chain_mutex held */ |
a737b3e2 AM |
3900 | static int do_tune_cpucache(struct kmem_cache *cachep, int limit, |
3901 | int batchcount, int shared) | |
1da177e4 | 3902 | { |
d2e7b7d0 | 3903 | struct ccupdate_struct *new; |
2ed3a4ef | 3904 | int i; |
1da177e4 | 3905 | |
d2e7b7d0 SS |
3906 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
3907 | if (!new) | |
3908 | return -ENOMEM; | |
3909 | ||
e498be7d | 3910 | for_each_online_cpu(i) { |
d2e7b7d0 | 3911 | new->new[i] = alloc_arraycache(cpu_to_node(i), limit, |
a737b3e2 | 3912 | batchcount); |
d2e7b7d0 | 3913 | if (!new->new[i]) { |
b28a02de | 3914 | for (i--; i >= 0; i--) |
d2e7b7d0 SS |
3915 | kfree(new->new[i]); |
3916 | kfree(new); | |
e498be7d | 3917 | return -ENOMEM; |
1da177e4 LT |
3918 | } |
3919 | } | |
d2e7b7d0 | 3920 | new->cachep = cachep; |
1da177e4 | 3921 | |
d2e7b7d0 | 3922 | on_each_cpu(do_ccupdate_local, (void *)new, 1, 1); |
e498be7d | 3923 | |
1da177e4 | 3924 | check_irq_on(); |
1da177e4 LT |
3925 | cachep->batchcount = batchcount; |
3926 | cachep->limit = limit; | |
e498be7d | 3927 | cachep->shared = shared; |
1da177e4 | 3928 | |
e498be7d | 3929 | for_each_online_cpu(i) { |
d2e7b7d0 | 3930 | struct array_cache *ccold = new->new[i]; |
1da177e4 LT |
3931 | if (!ccold) |
3932 | continue; | |
e498be7d | 3933 | spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
ff69416e | 3934 | free_block(cachep, ccold->entry, ccold->avail, cpu_to_node(i)); |
e498be7d | 3935 | spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
1da177e4 LT |
3936 | kfree(ccold); |
3937 | } | |
d2e7b7d0 | 3938 | kfree(new); |
2ed3a4ef | 3939 | return alloc_kmemlist(cachep); |
1da177e4 LT |
3940 | } |
3941 | ||
b5d8ca7c | 3942 | /* Called with cache_chain_mutex held always */ |
2ed3a4ef | 3943 | static int enable_cpucache(struct kmem_cache *cachep) |
1da177e4 LT |
3944 | { |
3945 | int err; | |
3946 | int limit, shared; | |
3947 | ||
a737b3e2 AM |
3948 | /* |
3949 | * The head array serves three purposes: | |
1da177e4 LT |
3950 | * - create a LIFO ordering, i.e. return objects that are cache-warm |
3951 | * - reduce the number of spinlock operations. | |
a737b3e2 | 3952 | * - reduce the number of linked list operations on the slab and |
1da177e4 LT |
3953 | * bufctl chains: array operations are cheaper. |
3954 | * The numbers are guessed, we should auto-tune as described by | |
3955 | * Bonwick. | |
3956 | */ | |
3dafccf2 | 3957 | if (cachep->buffer_size > 131072) |
1da177e4 | 3958 | limit = 1; |
3dafccf2 | 3959 | else if (cachep->buffer_size > PAGE_SIZE) |
1da177e4 | 3960 | limit = 8; |
3dafccf2 | 3961 | else if (cachep->buffer_size > 1024) |
1da177e4 | 3962 | limit = 24; |
3dafccf2 | 3963 | else if (cachep->buffer_size > 256) |
1da177e4 LT |
3964 | limit = 54; |
3965 | else | |
3966 | limit = 120; | |
3967 | ||
a737b3e2 AM |
3968 | /* |
3969 | * CPU bound tasks (e.g. network routing) can exhibit cpu bound | |
1da177e4 LT |
3970 | * allocation behaviour: Most allocs on one cpu, most free operations |
3971 | * on another cpu. For these cases, an efficient object passing between | |
3972 | * cpus is necessary. This is provided by a shared array. The array | |
3973 | * replaces Bonwick's magazine layer. | |
3974 | * On uniprocessor, it's functionally equivalent (but less efficient) | |
3975 | * to a larger limit. Thus disabled by default. | |
3976 | */ | |
3977 | shared = 0; | |
3978 | #ifdef CONFIG_SMP | |
3dafccf2 | 3979 | if (cachep->buffer_size <= PAGE_SIZE) |
1da177e4 LT |
3980 | shared = 8; |
3981 | #endif | |
3982 | ||
3983 | #if DEBUG | |
a737b3e2 AM |
3984 | /* |
3985 | * With debugging enabled, large batchcount lead to excessively long | |
3986 | * periods with disabled local interrupts. Limit the batchcount | |
1da177e4 LT |
3987 | */ |
3988 | if (limit > 32) | |
3989 | limit = 32; | |
3990 | #endif | |
b28a02de | 3991 | err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared); |
1da177e4 LT |
3992 | if (err) |
3993 | printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n", | |
b28a02de | 3994 | cachep->name, -err); |
2ed3a4ef | 3995 | return err; |
1da177e4 LT |
3996 | } |
3997 | ||
1b55253a CL |
3998 | /* |
3999 | * Drain an array if it contains any elements taking the l3 lock only if | |
b18e7e65 CL |
4000 | * necessary. Note that the l3 listlock also protects the array_cache |
4001 | * if drain_array() is used on the shared array. | |
1b55253a CL |
4002 | */ |
4003 | void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, | |
4004 | struct array_cache *ac, int force, int node) | |
1da177e4 LT |
4005 | { |
4006 | int tofree; | |
4007 | ||
1b55253a CL |
4008 | if (!ac || !ac->avail) |
4009 | return; | |
1da177e4 LT |
4010 | if (ac->touched && !force) { |
4011 | ac->touched = 0; | |
b18e7e65 | 4012 | } else { |
1b55253a | 4013 | spin_lock_irq(&l3->list_lock); |
b18e7e65 CL |
4014 | if (ac->avail) { |
4015 | tofree = force ? ac->avail : (ac->limit + 4) / 5; | |
4016 | if (tofree > ac->avail) | |
4017 | tofree = (ac->avail + 1) / 2; | |
4018 | free_block(cachep, ac->entry, tofree, node); | |
4019 | ac->avail -= tofree; | |
4020 | memmove(ac->entry, &(ac->entry[tofree]), | |
4021 | sizeof(void *) * ac->avail); | |
4022 | } | |
1b55253a | 4023 | spin_unlock_irq(&l3->list_lock); |
1da177e4 LT |
4024 | } |
4025 | } | |
4026 | ||
4027 | /** | |
4028 | * cache_reap - Reclaim memory from caches. | |
1e5d5331 | 4029 | * @unused: unused parameter |
1da177e4 LT |
4030 | * |
4031 | * Called from workqueue/eventd every few seconds. | |
4032 | * Purpose: | |
4033 | * - clear the per-cpu caches for this CPU. | |
4034 | * - return freeable pages to the main free memory pool. | |
4035 | * | |
a737b3e2 AM |
4036 | * If we cannot acquire the cache chain mutex then just give up - we'll try |
4037 | * again on the next iteration. | |
1da177e4 | 4038 | */ |
7c5cae36 | 4039 | static void cache_reap(struct work_struct *w) |
1da177e4 | 4040 | { |
7a7c381d | 4041 | struct kmem_cache *searchp; |
e498be7d | 4042 | struct kmem_list3 *l3; |
aab2207c | 4043 | int node = numa_node_id(); |
7c5cae36 CL |
4044 | struct delayed_work *work = |
4045 | container_of(w, struct delayed_work, work); | |
1da177e4 | 4046 | |
7c5cae36 | 4047 | if (!mutex_trylock(&cache_chain_mutex)) |
1da177e4 | 4048 | /* Give up. Setup the next iteration. */ |
7c5cae36 | 4049 | goto out; |
1da177e4 | 4050 | |
7a7c381d | 4051 | list_for_each_entry(searchp, &cache_chain, next) { |
1da177e4 LT |
4052 | check_irq_on(); |
4053 | ||
35386e3b CL |
4054 | /* |
4055 | * We only take the l3 lock if absolutely necessary and we | |
4056 | * have established with reasonable certainty that | |
4057 | * we can do some work if the lock was obtained. | |
4058 | */ | |
aab2207c | 4059 | l3 = searchp->nodelists[node]; |
35386e3b | 4060 | |
8fce4d8e | 4061 | reap_alien(searchp, l3); |
1da177e4 | 4062 | |
aab2207c | 4063 | drain_array(searchp, l3, cpu_cache_get(searchp), 0, node); |
1da177e4 | 4064 | |
35386e3b CL |
4065 | /* |
4066 | * These are racy checks but it does not matter | |
4067 | * if we skip one check or scan twice. | |
4068 | */ | |
e498be7d | 4069 | if (time_after(l3->next_reap, jiffies)) |
35386e3b | 4070 | goto next; |
1da177e4 | 4071 | |
e498be7d | 4072 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3; |
1da177e4 | 4073 | |
aab2207c | 4074 | drain_array(searchp, l3, l3->shared, 0, node); |
1da177e4 | 4075 | |
ed11d9eb | 4076 | if (l3->free_touched) |
e498be7d | 4077 | l3->free_touched = 0; |
ed11d9eb CL |
4078 | else { |
4079 | int freed; | |
1da177e4 | 4080 | |
ed11d9eb CL |
4081 | freed = drain_freelist(searchp, l3, (l3->free_limit + |
4082 | 5 * searchp->num - 1) / (5 * searchp->num)); | |
4083 | STATS_ADD_REAPED(searchp, freed); | |
4084 | } | |
35386e3b | 4085 | next: |
1da177e4 LT |
4086 | cond_resched(); |
4087 | } | |
4088 | check_irq_on(); | |
fc0abb14 | 4089 | mutex_unlock(&cache_chain_mutex); |
8fce4d8e | 4090 | next_reap_node(); |
2244b95a | 4091 | refresh_cpu_vm_stats(smp_processor_id()); |
7c5cae36 | 4092 | out: |
a737b3e2 | 4093 | /* Set up the next iteration */ |
7c5cae36 | 4094 | schedule_delayed_work(work, round_jiffies_relative(REAPTIMEOUT_CPUC)); |
1da177e4 LT |
4095 | } |
4096 | ||
4097 | #ifdef CONFIG_PROC_FS | |
4098 | ||
85289f98 | 4099 | static void print_slabinfo_header(struct seq_file *m) |
1da177e4 | 4100 | { |
85289f98 PE |
4101 | /* |
4102 | * Output format version, so at least we can change it | |
4103 | * without _too_ many complaints. | |
4104 | */ | |
1da177e4 | 4105 | #if STATS |
85289f98 | 4106 | seq_puts(m, "slabinfo - version: 2.1 (statistics)\n"); |
1da177e4 | 4107 | #else |
85289f98 | 4108 | seq_puts(m, "slabinfo - version: 2.1\n"); |
1da177e4 | 4109 | #endif |
85289f98 PE |
4110 | seq_puts(m, "# name <active_objs> <num_objs> <objsize> " |
4111 | "<objperslab> <pagesperslab>"); | |
4112 | seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>"); | |
4113 | seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); | |
1da177e4 | 4114 | #if STATS |
85289f98 | 4115 | seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> " |
fb7faf33 | 4116 | "<error> <maxfreeable> <nodeallocs> <remotefrees> <alienoverflow>"); |
85289f98 | 4117 | seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>"); |
1da177e4 | 4118 | #endif |
85289f98 PE |
4119 | seq_putc(m, '\n'); |
4120 | } | |
4121 | ||
4122 | static void *s_start(struct seq_file *m, loff_t *pos) | |
4123 | { | |
4124 | loff_t n = *pos; | |
4125 | struct list_head *p; | |
4126 | ||
fc0abb14 | 4127 | mutex_lock(&cache_chain_mutex); |
85289f98 PE |
4128 | if (!n) |
4129 | print_slabinfo_header(m); | |
1da177e4 LT |
4130 | p = cache_chain.next; |
4131 | while (n--) { | |
4132 | p = p->next; | |
4133 | if (p == &cache_chain) | |
4134 | return NULL; | |
4135 | } | |
343e0d7a | 4136 | return list_entry(p, struct kmem_cache, next); |
1da177e4 LT |
4137 | } |
4138 | ||
4139 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) | |
4140 | { | |
343e0d7a | 4141 | struct kmem_cache *cachep = p; |
1da177e4 | 4142 | ++*pos; |
a737b3e2 AM |
4143 | return cachep->next.next == &cache_chain ? |
4144 | NULL : list_entry(cachep->next.next, struct kmem_cache, next); | |
1da177e4 LT |
4145 | } |
4146 | ||
4147 | static void s_stop(struct seq_file *m, void *p) | |
4148 | { | |
fc0abb14 | 4149 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
4150 | } |
4151 | ||
4152 | static int s_show(struct seq_file *m, void *p) | |
4153 | { | |
343e0d7a | 4154 | struct kmem_cache *cachep = p; |
b28a02de PE |
4155 | struct slab *slabp; |
4156 | unsigned long active_objs; | |
4157 | unsigned long num_objs; | |
4158 | unsigned long active_slabs = 0; | |
4159 | unsigned long num_slabs, free_objects = 0, shared_avail = 0; | |
e498be7d | 4160 | const char *name; |
1da177e4 | 4161 | char *error = NULL; |
e498be7d CL |
4162 | int node; |
4163 | struct kmem_list3 *l3; | |
1da177e4 | 4164 | |
1da177e4 LT |
4165 | active_objs = 0; |
4166 | num_slabs = 0; | |
e498be7d CL |
4167 | for_each_online_node(node) { |
4168 | l3 = cachep->nodelists[node]; | |
4169 | if (!l3) | |
4170 | continue; | |
4171 | ||
ca3b9b91 RT |
4172 | check_irq_on(); |
4173 | spin_lock_irq(&l3->list_lock); | |
e498be7d | 4174 | |
7a7c381d | 4175 | list_for_each_entry(slabp, &l3->slabs_full, list) { |
e498be7d CL |
4176 | if (slabp->inuse != cachep->num && !error) |
4177 | error = "slabs_full accounting error"; | |
4178 | active_objs += cachep->num; | |
4179 | active_slabs++; | |
4180 | } | |
7a7c381d | 4181 | list_for_each_entry(slabp, &l3->slabs_partial, list) { |
e498be7d CL |
4182 | if (slabp->inuse == cachep->num && !error) |
4183 | error = "slabs_partial inuse accounting error"; | |
4184 | if (!slabp->inuse && !error) | |
4185 | error = "slabs_partial/inuse accounting error"; | |
4186 | active_objs += slabp->inuse; | |
4187 | active_slabs++; | |
4188 | } | |
7a7c381d | 4189 | list_for_each_entry(slabp, &l3->slabs_free, list) { |
e498be7d CL |
4190 | if (slabp->inuse && !error) |
4191 | error = "slabs_free/inuse accounting error"; | |
4192 | num_slabs++; | |
4193 | } | |
4194 | free_objects += l3->free_objects; | |
4484ebf1 RT |
4195 | if (l3->shared) |
4196 | shared_avail += l3->shared->avail; | |
e498be7d | 4197 | |
ca3b9b91 | 4198 | spin_unlock_irq(&l3->list_lock); |
1da177e4 | 4199 | } |
b28a02de PE |
4200 | num_slabs += active_slabs; |
4201 | num_objs = num_slabs * cachep->num; | |
e498be7d | 4202 | if (num_objs - active_objs != free_objects && !error) |
1da177e4 LT |
4203 | error = "free_objects accounting error"; |
4204 | ||
b28a02de | 4205 | name = cachep->name; |
1da177e4 LT |
4206 | if (error) |
4207 | printk(KERN_ERR "slab: cache %s error: %s\n", name, error); | |
4208 | ||
4209 | seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", | |
3dafccf2 | 4210 | name, active_objs, num_objs, cachep->buffer_size, |
b28a02de | 4211 | cachep->num, (1 << cachep->gfporder)); |
1da177e4 | 4212 | seq_printf(m, " : tunables %4u %4u %4u", |
b28a02de | 4213 | cachep->limit, cachep->batchcount, cachep->shared); |
e498be7d | 4214 | seq_printf(m, " : slabdata %6lu %6lu %6lu", |
b28a02de | 4215 | active_slabs, num_slabs, shared_avail); |
1da177e4 | 4216 | #if STATS |
b28a02de | 4217 | { /* list3 stats */ |
1da177e4 LT |
4218 | unsigned long high = cachep->high_mark; |
4219 | unsigned long allocs = cachep->num_allocations; | |
4220 | unsigned long grown = cachep->grown; | |
4221 | unsigned long reaped = cachep->reaped; | |
4222 | unsigned long errors = cachep->errors; | |
4223 | unsigned long max_freeable = cachep->max_freeable; | |
1da177e4 | 4224 | unsigned long node_allocs = cachep->node_allocs; |
e498be7d | 4225 | unsigned long node_frees = cachep->node_frees; |
fb7faf33 | 4226 | unsigned long overflows = cachep->node_overflow; |
1da177e4 | 4227 | |
e498be7d | 4228 | seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \ |
fb7faf33 | 4229 | %4lu %4lu %4lu %4lu %4lu", allocs, high, grown, |
a737b3e2 | 4230 | reaped, errors, max_freeable, node_allocs, |
fb7faf33 | 4231 | node_frees, overflows); |
1da177e4 LT |
4232 | } |
4233 | /* cpu stats */ | |
4234 | { | |
4235 | unsigned long allochit = atomic_read(&cachep->allochit); | |
4236 | unsigned long allocmiss = atomic_read(&cachep->allocmiss); | |
4237 | unsigned long freehit = atomic_read(&cachep->freehit); | |
4238 | unsigned long freemiss = atomic_read(&cachep->freemiss); | |
4239 | ||
4240 | seq_printf(m, " : cpustat %6lu %6lu %6lu %6lu", | |
b28a02de | 4241 | allochit, allocmiss, freehit, freemiss); |
1da177e4 LT |
4242 | } |
4243 | #endif | |
4244 | seq_putc(m, '\n'); | |
1da177e4 LT |
4245 | return 0; |
4246 | } | |
4247 | ||
4248 | /* | |
4249 | * slabinfo_op - iterator that generates /proc/slabinfo | |
4250 | * | |
4251 | * Output layout: | |
4252 | * cache-name | |
4253 | * num-active-objs | |
4254 | * total-objs | |
4255 | * object size | |
4256 | * num-active-slabs | |
4257 | * total-slabs | |
4258 | * num-pages-per-slab | |
4259 | * + further values on SMP and with statistics enabled | |
4260 | */ | |
4261 | ||
15ad7cdc | 4262 | const struct seq_operations slabinfo_op = { |
b28a02de PE |
4263 | .start = s_start, |
4264 | .next = s_next, | |
4265 | .stop = s_stop, | |
4266 | .show = s_show, | |
1da177e4 LT |
4267 | }; |
4268 | ||
4269 | #define MAX_SLABINFO_WRITE 128 | |
4270 | /** | |
4271 | * slabinfo_write - Tuning for the slab allocator | |
4272 | * @file: unused | |
4273 | * @buffer: user buffer | |
4274 | * @count: data length | |
4275 | * @ppos: unused | |
4276 | */ | |
b28a02de PE |
4277 | ssize_t slabinfo_write(struct file *file, const char __user * buffer, |
4278 | size_t count, loff_t *ppos) | |
1da177e4 | 4279 | { |
b28a02de | 4280 | char kbuf[MAX_SLABINFO_WRITE + 1], *tmp; |
1da177e4 | 4281 | int limit, batchcount, shared, res; |
7a7c381d | 4282 | struct kmem_cache *cachep; |
b28a02de | 4283 | |
1da177e4 LT |
4284 | if (count > MAX_SLABINFO_WRITE) |
4285 | return -EINVAL; | |
4286 | if (copy_from_user(&kbuf, buffer, count)) | |
4287 | return -EFAULT; | |
b28a02de | 4288 | kbuf[MAX_SLABINFO_WRITE] = '\0'; |
1da177e4 LT |
4289 | |
4290 | tmp = strchr(kbuf, ' '); | |
4291 | if (!tmp) | |
4292 | return -EINVAL; | |
4293 | *tmp = '\0'; | |
4294 | tmp++; | |
4295 | if (sscanf(tmp, " %d %d %d", &limit, &batchcount, &shared) != 3) | |
4296 | return -EINVAL; | |
4297 | ||
4298 | /* Find the cache in the chain of caches. */ | |
fc0abb14 | 4299 | mutex_lock(&cache_chain_mutex); |
1da177e4 | 4300 | res = -EINVAL; |
7a7c381d | 4301 | list_for_each_entry(cachep, &cache_chain, next) { |
1da177e4 | 4302 | if (!strcmp(cachep->name, kbuf)) { |
a737b3e2 AM |
4303 | if (limit < 1 || batchcount < 1 || |
4304 | batchcount > limit || shared < 0) { | |
e498be7d | 4305 | res = 0; |
1da177e4 | 4306 | } else { |
e498be7d | 4307 | res = do_tune_cpucache(cachep, limit, |
b28a02de | 4308 | batchcount, shared); |
1da177e4 LT |
4309 | } |
4310 | break; | |
4311 | } | |
4312 | } | |
fc0abb14 | 4313 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
4314 | if (res >= 0) |
4315 | res = count; | |
4316 | return res; | |
4317 | } | |
871751e2 AV |
4318 | |
4319 | #ifdef CONFIG_DEBUG_SLAB_LEAK | |
4320 | ||
4321 | static void *leaks_start(struct seq_file *m, loff_t *pos) | |
4322 | { | |
4323 | loff_t n = *pos; | |
4324 | struct list_head *p; | |
4325 | ||
4326 | mutex_lock(&cache_chain_mutex); | |
4327 | p = cache_chain.next; | |
4328 | while (n--) { | |
4329 | p = p->next; | |
4330 | if (p == &cache_chain) | |
4331 | return NULL; | |
4332 | } | |
4333 | return list_entry(p, struct kmem_cache, next); | |
4334 | } | |
4335 | ||
4336 | static inline int add_caller(unsigned long *n, unsigned long v) | |
4337 | { | |
4338 | unsigned long *p; | |
4339 | int l; | |
4340 | if (!v) | |
4341 | return 1; | |
4342 | l = n[1]; | |
4343 | p = n + 2; | |
4344 | while (l) { | |
4345 | int i = l/2; | |
4346 | unsigned long *q = p + 2 * i; | |
4347 | if (*q == v) { | |
4348 | q[1]++; | |
4349 | return 1; | |
4350 | } | |
4351 | if (*q > v) { | |
4352 | l = i; | |
4353 | } else { | |
4354 | p = q + 2; | |
4355 | l -= i + 1; | |
4356 | } | |
4357 | } | |
4358 | if (++n[1] == n[0]) | |
4359 | return 0; | |
4360 | memmove(p + 2, p, n[1] * 2 * sizeof(unsigned long) - ((void *)p - (void *)n)); | |
4361 | p[0] = v; | |
4362 | p[1] = 1; | |
4363 | return 1; | |
4364 | } | |
4365 | ||
4366 | static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s) | |
4367 | { | |
4368 | void *p; | |
4369 | int i; | |
4370 | if (n[0] == n[1]) | |
4371 | return; | |
4372 | for (i = 0, p = s->s_mem; i < c->num; i++, p += c->buffer_size) { | |
4373 | if (slab_bufctl(s)[i] != BUFCTL_ACTIVE) | |
4374 | continue; | |
4375 | if (!add_caller(n, (unsigned long)*dbg_userword(c, p))) | |
4376 | return; | |
4377 | } | |
4378 | } | |
4379 | ||
4380 | static void show_symbol(struct seq_file *m, unsigned long address) | |
4381 | { | |
4382 | #ifdef CONFIG_KALLSYMS | |
4383 | char *modname; | |
4384 | const char *name; | |
4385 | unsigned long offset, size; | |
4386 | char namebuf[KSYM_NAME_LEN+1]; | |
4387 | ||
4388 | name = kallsyms_lookup(address, &size, &offset, &modname, namebuf); | |
4389 | ||
4390 | if (name) { | |
4391 | seq_printf(m, "%s+%#lx/%#lx", name, offset, size); | |
4392 | if (modname) | |
4393 | seq_printf(m, " [%s]", modname); | |
4394 | return; | |
4395 | } | |
4396 | #endif | |
4397 | seq_printf(m, "%p", (void *)address); | |
4398 | } | |
4399 | ||
4400 | static int leaks_show(struct seq_file *m, void *p) | |
4401 | { | |
4402 | struct kmem_cache *cachep = p; | |
871751e2 AV |
4403 | struct slab *slabp; |
4404 | struct kmem_list3 *l3; | |
4405 | const char *name; | |
4406 | unsigned long *n = m->private; | |
4407 | int node; | |
4408 | int i; | |
4409 | ||
4410 | if (!(cachep->flags & SLAB_STORE_USER)) | |
4411 | return 0; | |
4412 | if (!(cachep->flags & SLAB_RED_ZONE)) | |
4413 | return 0; | |
4414 | ||
4415 | /* OK, we can do it */ | |
4416 | ||
4417 | n[1] = 0; | |
4418 | ||
4419 | for_each_online_node(node) { | |
4420 | l3 = cachep->nodelists[node]; | |
4421 | if (!l3) | |
4422 | continue; | |
4423 | ||
4424 | check_irq_on(); | |
4425 | spin_lock_irq(&l3->list_lock); | |
4426 | ||
7a7c381d | 4427 | list_for_each_entry(slabp, &l3->slabs_full, list) |
871751e2 | 4428 | handle_slab(n, cachep, slabp); |
7a7c381d | 4429 | list_for_each_entry(slabp, &l3->slabs_partial, list) |
871751e2 | 4430 | handle_slab(n, cachep, slabp); |
871751e2 AV |
4431 | spin_unlock_irq(&l3->list_lock); |
4432 | } | |
4433 | name = cachep->name; | |
4434 | if (n[0] == n[1]) { | |
4435 | /* Increase the buffer size */ | |
4436 | mutex_unlock(&cache_chain_mutex); | |
4437 | m->private = kzalloc(n[0] * 4 * sizeof(unsigned long), GFP_KERNEL); | |
4438 | if (!m->private) { | |
4439 | /* Too bad, we are really out */ | |
4440 | m->private = n; | |
4441 | mutex_lock(&cache_chain_mutex); | |
4442 | return -ENOMEM; | |
4443 | } | |
4444 | *(unsigned long *)m->private = n[0] * 2; | |
4445 | kfree(n); | |
4446 | mutex_lock(&cache_chain_mutex); | |
4447 | /* Now make sure this entry will be retried */ | |
4448 | m->count = m->size; | |
4449 | return 0; | |
4450 | } | |
4451 | for (i = 0; i < n[1]; i++) { | |
4452 | seq_printf(m, "%s: %lu ", name, n[2*i+3]); | |
4453 | show_symbol(m, n[2*i+2]); | |
4454 | seq_putc(m, '\n'); | |
4455 | } | |
d2e7b7d0 | 4456 | |
871751e2 AV |
4457 | return 0; |
4458 | } | |
4459 | ||
15ad7cdc | 4460 | const struct seq_operations slabstats_op = { |
871751e2 AV |
4461 | .start = leaks_start, |
4462 | .next = s_next, | |
4463 | .stop = s_stop, | |
4464 | .show = leaks_show, | |
4465 | }; | |
4466 | #endif | |
1da177e4 LT |
4467 | #endif |
4468 | ||
00e145b6 MS |
4469 | /** |
4470 | * ksize - get the actual amount of memory allocated for a given object | |
4471 | * @objp: Pointer to the object | |
4472 | * | |
4473 | * kmalloc may internally round up allocations and return more memory | |
4474 | * than requested. ksize() can be used to determine the actual amount of | |
4475 | * memory allocated. The caller may use this additional memory, even though | |
4476 | * a smaller amount of memory was initially specified with the kmalloc call. | |
4477 | * The caller must guarantee that objp points to a valid object previously | |
4478 | * allocated with either kmalloc() or kmem_cache_alloc(). The object | |
4479 | * must not be freed during the duration of the call. | |
4480 | */ | |
1da177e4 LT |
4481 | unsigned int ksize(const void *objp) |
4482 | { | |
00e145b6 MS |
4483 | if (unlikely(objp == NULL)) |
4484 | return 0; | |
1da177e4 | 4485 | |
6ed5eb22 | 4486 | return obj_size(virt_to_cache(objp)); |
1da177e4 | 4487 | } |