Commit | Line | Data |
---|---|---|
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 | |
183ff22b | 29 | * slabs and you must pass objects with the same initializations to |
1da177e4 LT |
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> |
a0ec95a8 | 98 | #include <linux/proc_fs.h> |
1da177e4 LT |
99 | #include <linux/seq_file.h> |
100 | #include <linux/notifier.h> | |
101 | #include <linux/kallsyms.h> | |
102 | #include <linux/cpu.h> | |
103 | #include <linux/sysctl.h> | |
104 | #include <linux/module.h> | |
02af61bb | 105 | #include <linux/kmemtrace.h> |
1da177e4 | 106 | #include <linux/rcupdate.h> |
543537bd | 107 | #include <linux/string.h> |
138ae663 | 108 | #include <linux/uaccess.h> |
e498be7d | 109 | #include <linux/nodemask.h> |
d5cff635 | 110 | #include <linux/kmemleak.h> |
dc85da15 | 111 | #include <linux/mempolicy.h> |
fc0abb14 | 112 | #include <linux/mutex.h> |
8a8b6502 | 113 | #include <linux/fault-inject.h> |
e7eebaf6 | 114 | #include <linux/rtmutex.h> |
6a2d7a95 | 115 | #include <linux/reciprocal_div.h> |
3ac7fe5a | 116 | #include <linux/debugobjects.h> |
c175eea4 | 117 | #include <linux/kmemcheck.h> |
1da177e4 | 118 | |
1da177e4 LT |
119 | #include <asm/cacheflush.h> |
120 | #include <asm/tlbflush.h> | |
121 | #include <asm/page.h> | |
122 | ||
123 | /* | |
50953fe9 | 124 | * DEBUG - 1 for kmem_cache_create() to honour; SLAB_RED_ZONE & SLAB_POISON. |
1da177e4 LT |
125 | * 0 for faster, smaller code (especially in the critical paths). |
126 | * | |
127 | * STATS - 1 to collect stats for /proc/slabinfo. | |
128 | * 0 for faster, smaller code (especially in the critical paths). | |
129 | * | |
130 | * FORCED_DEBUG - 1 enables SLAB_RED_ZONE and SLAB_POISON (if possible) | |
131 | */ | |
132 | ||
133 | #ifdef CONFIG_DEBUG_SLAB | |
134 | #define DEBUG 1 | |
135 | #define STATS 1 | |
136 | #define FORCED_DEBUG 1 | |
137 | #else | |
138 | #define DEBUG 0 | |
139 | #define STATS 0 | |
140 | #define FORCED_DEBUG 0 | |
141 | #endif | |
142 | ||
1da177e4 LT |
143 | /* Shouldn't this be in a header file somewhere? */ |
144 | #define BYTES_PER_WORD sizeof(void *) | |
87a927c7 | 145 | #define REDZONE_ALIGN max(BYTES_PER_WORD, __alignof__(unsigned long long)) |
1da177e4 | 146 | |
1da177e4 LT |
147 | #ifndef ARCH_KMALLOC_MINALIGN |
148 | /* | |
149 | * Enforce a minimum alignment for the kmalloc caches. | |
150 | * Usually, the kmalloc caches are cache_line_size() aligned, except when | |
151 | * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned. | |
152 | * Some archs want to perform DMA into kmalloc caches and need a guaranteed | |
b46b8f19 DW |
153 | * alignment larger than the alignment of a 64-bit integer. |
154 | * ARCH_KMALLOC_MINALIGN allows that. | |
155 | * Note that increasing this value may disable some debug features. | |
1da177e4 | 156 | */ |
b46b8f19 | 157 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) |
1da177e4 LT |
158 | #endif |
159 | ||
160 | #ifndef ARCH_SLAB_MINALIGN | |
161 | /* | |
162 | * Enforce a minimum alignment for all caches. | |
163 | * Intended for archs that get misalignment faults even for BYTES_PER_WORD | |
164 | * aligned buffers. Includes ARCH_KMALLOC_MINALIGN. | |
165 | * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables | |
166 | * some debug features. | |
167 | */ | |
168 | #define ARCH_SLAB_MINALIGN 0 | |
169 | #endif | |
170 | ||
171 | #ifndef ARCH_KMALLOC_FLAGS | |
172 | #define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN | |
173 | #endif | |
174 | ||
175 | /* Legal flag mask for kmem_cache_create(). */ | |
176 | #if DEBUG | |
50953fe9 | 177 | # define CREATE_MASK (SLAB_RED_ZONE | \ |
1da177e4 | 178 | SLAB_POISON | SLAB_HWCACHE_ALIGN | \ |
ac2b898c | 179 | SLAB_CACHE_DMA | \ |
5af60839 | 180 | SLAB_STORE_USER | \ |
1da177e4 | 181 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ |
3ac7fe5a | 182 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD | \ |
c175eea4 | 183 | SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE | SLAB_NOTRACK) |
1da177e4 | 184 | #else |
ac2b898c | 185 | # define CREATE_MASK (SLAB_HWCACHE_ALIGN | \ |
5af60839 | 186 | SLAB_CACHE_DMA | \ |
1da177e4 | 187 | SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ |
3ac7fe5a | 188 | SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD | \ |
c175eea4 | 189 | SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE | SLAB_NOTRACK) |
1da177e4 LT |
190 | #endif |
191 | ||
192 | /* | |
193 | * kmem_bufctl_t: | |
194 | * | |
195 | * Bufctl's are used for linking objs within a slab | |
196 | * linked offsets. | |
197 | * | |
198 | * This implementation relies on "struct page" for locating the cache & | |
199 | * slab an object belongs to. | |
200 | * This allows the bufctl structure to be small (one int), but limits | |
201 | * the number of objects a slab (not a cache) can contain when off-slab | |
202 | * bufctls are used. The limit is the size of the largest general cache | |
203 | * that does not use off-slab slabs. | |
204 | * For 32bit archs with 4 kB pages, is this 56. | |
205 | * This is not serious, as it is only for large objects, when it is unwise | |
206 | * to have too many per slab. | |
207 | * Note: This limit can be raised by introducing a general cache whose size | |
208 | * is less than 512 (PAGE_SIZE<<3), but greater than 256. | |
209 | */ | |
210 | ||
fa5b08d5 | 211 | typedef unsigned int kmem_bufctl_t; |
1da177e4 LT |
212 | #define BUFCTL_END (((kmem_bufctl_t)(~0U))-0) |
213 | #define BUFCTL_FREE (((kmem_bufctl_t)(~0U))-1) | |
871751e2 AV |
214 | #define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2) |
215 | #define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3) | |
1da177e4 | 216 | |
1da177e4 LT |
217 | /* |
218 | * struct slab | |
219 | * | |
220 | * Manages the objs in a slab. Placed either at the beginning of mem allocated | |
221 | * for a slab, or allocated from an general cache. | |
222 | * Slabs are chained into three list: fully used, partial, fully free slabs. | |
223 | */ | |
224 | struct slab { | |
b28a02de PE |
225 | struct list_head list; |
226 | unsigned long colouroff; | |
227 | void *s_mem; /* including colour offset */ | |
228 | unsigned int inuse; /* num of objs active in slab */ | |
229 | kmem_bufctl_t free; | |
230 | unsigned short nodeid; | |
1da177e4 LT |
231 | }; |
232 | ||
233 | /* | |
234 | * struct slab_rcu | |
235 | * | |
236 | * slab_destroy on a SLAB_DESTROY_BY_RCU cache uses this structure to | |
237 | * arrange for kmem_freepages to be called via RCU. This is useful if | |
238 | * we need to approach a kernel structure obliquely, from its address | |
239 | * obtained without the usual locking. We can lock the structure to | |
240 | * stabilize it and check it's still at the given address, only if we | |
241 | * can be sure that the memory has not been meanwhile reused for some | |
242 | * other kind of object (which our subsystem's lock might corrupt). | |
243 | * | |
244 | * rcu_read_lock before reading the address, then rcu_read_unlock after | |
245 | * taking the spinlock within the structure expected at that address. | |
246 | * | |
247 | * We assume struct slab_rcu can overlay struct slab when destroying. | |
248 | */ | |
249 | struct slab_rcu { | |
b28a02de | 250 | struct rcu_head head; |
343e0d7a | 251 | struct kmem_cache *cachep; |
b28a02de | 252 | void *addr; |
1da177e4 LT |
253 | }; |
254 | ||
255 | /* | |
256 | * struct array_cache | |
257 | * | |
1da177e4 LT |
258 | * Purpose: |
259 | * - LIFO ordering, to hand out cache-warm objects from _alloc | |
260 | * - reduce the number of linked list operations | |
261 | * - reduce spinlock operations | |
262 | * | |
263 | * The limit is stored in the per-cpu structure to reduce the data cache | |
264 | * footprint. | |
265 | * | |
266 | */ | |
267 | struct array_cache { | |
268 | unsigned int avail; | |
269 | unsigned int limit; | |
270 | unsigned int batchcount; | |
271 | unsigned int touched; | |
e498be7d | 272 | spinlock_t lock; |
bda5b655 | 273 | void *entry[]; /* |
a737b3e2 AM |
274 | * Must have this definition in here for the proper |
275 | * alignment of array_cache. Also simplifies accessing | |
276 | * the entries. | |
a737b3e2 | 277 | */ |
1da177e4 LT |
278 | }; |
279 | ||
a737b3e2 AM |
280 | /* |
281 | * bootstrap: The caches do not work without cpuarrays anymore, but the | |
282 | * cpuarrays are allocated from the generic caches... | |
1da177e4 LT |
283 | */ |
284 | #define BOOT_CPUCACHE_ENTRIES 1 | |
285 | struct arraycache_init { | |
286 | struct array_cache cache; | |
b28a02de | 287 | void *entries[BOOT_CPUCACHE_ENTRIES]; |
1da177e4 LT |
288 | }; |
289 | ||
290 | /* | |
e498be7d | 291 | * The slab lists for all objects. |
1da177e4 LT |
292 | */ |
293 | struct kmem_list3 { | |
b28a02de PE |
294 | struct list_head slabs_partial; /* partial list first, better asm code */ |
295 | struct list_head slabs_full; | |
296 | struct list_head slabs_free; | |
297 | unsigned long free_objects; | |
b28a02de | 298 | unsigned int free_limit; |
2e1217cf | 299 | unsigned int colour_next; /* Per-node cache coloring */ |
b28a02de PE |
300 | spinlock_t list_lock; |
301 | struct array_cache *shared; /* shared per node */ | |
302 | struct array_cache **alien; /* on other nodes */ | |
35386e3b CL |
303 | unsigned long next_reap; /* updated without locking */ |
304 | int free_touched; /* updated without locking */ | |
1da177e4 LT |
305 | }; |
306 | ||
e498be7d CL |
307 | /* |
308 | * Need this for bootstrapping a per node allocator. | |
309 | */ | |
556a169d | 310 | #define NUM_INIT_LISTS (3 * MAX_NUMNODES) |
e498be7d CL |
311 | struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS]; |
312 | #define CACHE_CACHE 0 | |
556a169d PE |
313 | #define SIZE_AC MAX_NUMNODES |
314 | #define SIZE_L3 (2 * MAX_NUMNODES) | |
e498be7d | 315 | |
ed11d9eb CL |
316 | static int drain_freelist(struct kmem_cache *cache, |
317 | struct kmem_list3 *l3, int tofree); | |
318 | static void free_block(struct kmem_cache *cachep, void **objpp, int len, | |
319 | int node); | |
83b519e8 | 320 | static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp); |
65f27f38 | 321 | static void cache_reap(struct work_struct *unused); |
ed11d9eb | 322 | |
e498be7d | 323 | /* |
a737b3e2 AM |
324 | * This function must be completely optimized away if a constant is passed to |
325 | * it. Mostly the same as what is in linux/slab.h except it returns an index. | |
e498be7d | 326 | */ |
7243cc05 | 327 | static __always_inline int index_of(const size_t size) |
e498be7d | 328 | { |
5ec8a847 SR |
329 | extern void __bad_size(void); |
330 | ||
e498be7d CL |
331 | if (__builtin_constant_p(size)) { |
332 | int i = 0; | |
333 | ||
334 | #define CACHE(x) \ | |
335 | if (size <=x) \ | |
336 | return i; \ | |
337 | else \ | |
338 | i++; | |
1c61fc40 | 339 | #include <linux/kmalloc_sizes.h> |
e498be7d | 340 | #undef CACHE |
5ec8a847 | 341 | __bad_size(); |
7243cc05 | 342 | } else |
5ec8a847 | 343 | __bad_size(); |
e498be7d CL |
344 | return 0; |
345 | } | |
346 | ||
e0a42726 IM |
347 | static int slab_early_init = 1; |
348 | ||
e498be7d CL |
349 | #define INDEX_AC index_of(sizeof(struct arraycache_init)) |
350 | #define INDEX_L3 index_of(sizeof(struct kmem_list3)) | |
1da177e4 | 351 | |
5295a74c | 352 | static void kmem_list3_init(struct kmem_list3 *parent) |
e498be7d CL |
353 | { |
354 | INIT_LIST_HEAD(&parent->slabs_full); | |
355 | INIT_LIST_HEAD(&parent->slabs_partial); | |
356 | INIT_LIST_HEAD(&parent->slabs_free); | |
357 | parent->shared = NULL; | |
358 | parent->alien = NULL; | |
2e1217cf | 359 | parent->colour_next = 0; |
e498be7d CL |
360 | spin_lock_init(&parent->list_lock); |
361 | parent->free_objects = 0; | |
362 | parent->free_touched = 0; | |
363 | } | |
364 | ||
a737b3e2 AM |
365 | #define MAKE_LIST(cachep, listp, slab, nodeid) \ |
366 | do { \ | |
367 | INIT_LIST_HEAD(listp); \ | |
368 | list_splice(&(cachep->nodelists[nodeid]->slab), listp); \ | |
e498be7d CL |
369 | } while (0) |
370 | ||
a737b3e2 AM |
371 | #define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ |
372 | do { \ | |
e498be7d CL |
373 | MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid); \ |
374 | MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \ | |
375 | MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \ | |
376 | } while (0) | |
1da177e4 | 377 | |
1da177e4 LT |
378 | #define CFLGS_OFF_SLAB (0x80000000UL) |
379 | #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) | |
380 | ||
381 | #define BATCHREFILL_LIMIT 16 | |
a737b3e2 AM |
382 | /* |
383 | * Optimization question: fewer reaps means less probability for unnessary | |
384 | * cpucache drain/refill cycles. | |
1da177e4 | 385 | * |
dc6f3f27 | 386 | * OTOH the cpuarrays can contain lots of objects, |
1da177e4 LT |
387 | * which could lock up otherwise freeable slabs. |
388 | */ | |
389 | #define REAPTIMEOUT_CPUC (2*HZ) | |
390 | #define REAPTIMEOUT_LIST3 (4*HZ) | |
391 | ||
392 | #if STATS | |
393 | #define STATS_INC_ACTIVE(x) ((x)->num_active++) | |
394 | #define STATS_DEC_ACTIVE(x) ((x)->num_active--) | |
395 | #define STATS_INC_ALLOCED(x) ((x)->num_allocations++) | |
396 | #define STATS_INC_GROWN(x) ((x)->grown++) | |
ed11d9eb | 397 | #define STATS_ADD_REAPED(x,y) ((x)->reaped += (y)) |
a737b3e2 AM |
398 | #define STATS_SET_HIGH(x) \ |
399 | do { \ | |
400 | if ((x)->num_active > (x)->high_mark) \ | |
401 | (x)->high_mark = (x)->num_active; \ | |
402 | } while (0) | |
1da177e4 LT |
403 | #define STATS_INC_ERR(x) ((x)->errors++) |
404 | #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++) | |
e498be7d | 405 | #define STATS_INC_NODEFREES(x) ((x)->node_frees++) |
fb7faf33 | 406 | #define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++) |
a737b3e2 AM |
407 | #define STATS_SET_FREEABLE(x, i) \ |
408 | do { \ | |
409 | if ((x)->max_freeable < i) \ | |
410 | (x)->max_freeable = i; \ | |
411 | } while (0) | |
1da177e4 LT |
412 | #define STATS_INC_ALLOCHIT(x) atomic_inc(&(x)->allochit) |
413 | #define STATS_INC_ALLOCMISS(x) atomic_inc(&(x)->allocmiss) | |
414 | #define STATS_INC_FREEHIT(x) atomic_inc(&(x)->freehit) | |
415 | #define STATS_INC_FREEMISS(x) atomic_inc(&(x)->freemiss) | |
416 | #else | |
417 | #define STATS_INC_ACTIVE(x) do { } while (0) | |
418 | #define STATS_DEC_ACTIVE(x) do { } while (0) | |
419 | #define STATS_INC_ALLOCED(x) do { } while (0) | |
420 | #define STATS_INC_GROWN(x) do { } while (0) | |
ed11d9eb | 421 | #define STATS_ADD_REAPED(x,y) do { } while (0) |
1da177e4 LT |
422 | #define STATS_SET_HIGH(x) do { } while (0) |
423 | #define STATS_INC_ERR(x) do { } while (0) | |
424 | #define STATS_INC_NODEALLOCS(x) do { } while (0) | |
e498be7d | 425 | #define STATS_INC_NODEFREES(x) do { } while (0) |
fb7faf33 | 426 | #define STATS_INC_ACOVERFLOW(x) do { } while (0) |
a737b3e2 | 427 | #define STATS_SET_FREEABLE(x, i) do { } while (0) |
1da177e4 LT |
428 | #define STATS_INC_ALLOCHIT(x) do { } while (0) |
429 | #define STATS_INC_ALLOCMISS(x) do { } while (0) | |
430 | #define STATS_INC_FREEHIT(x) do { } while (0) | |
431 | #define STATS_INC_FREEMISS(x) do { } while (0) | |
432 | #endif | |
433 | ||
434 | #if DEBUG | |
1da177e4 | 435 | |
a737b3e2 AM |
436 | /* |
437 | * memory layout of objects: | |
1da177e4 | 438 | * 0 : objp |
3dafccf2 | 439 | * 0 .. cachep->obj_offset - BYTES_PER_WORD - 1: padding. This ensures that |
1da177e4 LT |
440 | * the end of an object is aligned with the end of the real |
441 | * allocation. Catches writes behind the end of the allocation. | |
3dafccf2 | 442 | * cachep->obj_offset - BYTES_PER_WORD .. cachep->obj_offset - 1: |
1da177e4 | 443 | * redzone word. |
3dafccf2 MS |
444 | * cachep->obj_offset: The real object. |
445 | * cachep->buffer_size - 2* BYTES_PER_WORD: redzone word [BYTES_PER_WORD long] | |
a737b3e2 AM |
446 | * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address |
447 | * [BYTES_PER_WORD long] | |
1da177e4 | 448 | */ |
343e0d7a | 449 | static int obj_offset(struct kmem_cache *cachep) |
1da177e4 | 450 | { |
3dafccf2 | 451 | return cachep->obj_offset; |
1da177e4 LT |
452 | } |
453 | ||
343e0d7a | 454 | static int obj_size(struct kmem_cache *cachep) |
1da177e4 | 455 | { |
3dafccf2 | 456 | return cachep->obj_size; |
1da177e4 LT |
457 | } |
458 | ||
b46b8f19 | 459 | static unsigned long long *dbg_redzone1(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
460 | { |
461 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
b46b8f19 DW |
462 | return (unsigned long long*) (objp + obj_offset(cachep) - |
463 | sizeof(unsigned long long)); | |
1da177e4 LT |
464 | } |
465 | ||
b46b8f19 | 466 | static unsigned long long *dbg_redzone2(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
467 | { |
468 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
469 | if (cachep->flags & SLAB_STORE_USER) | |
b46b8f19 DW |
470 | return (unsigned long long *)(objp + cachep->buffer_size - |
471 | sizeof(unsigned long long) - | |
87a927c7 | 472 | REDZONE_ALIGN); |
b46b8f19 DW |
473 | return (unsigned long long *) (objp + cachep->buffer_size - |
474 | sizeof(unsigned long long)); | |
1da177e4 LT |
475 | } |
476 | ||
343e0d7a | 477 | static void **dbg_userword(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
478 | { |
479 | BUG_ON(!(cachep->flags & SLAB_STORE_USER)); | |
3dafccf2 | 480 | return (void **)(objp + cachep->buffer_size - BYTES_PER_WORD); |
1da177e4 LT |
481 | } |
482 | ||
483 | #else | |
484 | ||
3dafccf2 MS |
485 | #define obj_offset(x) 0 |
486 | #define obj_size(cachep) (cachep->buffer_size) | |
b46b8f19 DW |
487 | #define dbg_redzone1(cachep, objp) ({BUG(); (unsigned long long *)NULL;}) |
488 | #define dbg_redzone2(cachep, objp) ({BUG(); (unsigned long long *)NULL;}) | |
1da177e4 LT |
489 | #define dbg_userword(cachep, objp) ({BUG(); (void **)NULL;}) |
490 | ||
491 | #endif | |
492 | ||
0f24f128 | 493 | #ifdef CONFIG_TRACING |
36555751 EGM |
494 | size_t slab_buffer_size(struct kmem_cache *cachep) |
495 | { | |
496 | return cachep->buffer_size; | |
497 | } | |
498 | EXPORT_SYMBOL(slab_buffer_size); | |
499 | #endif | |
500 | ||
1da177e4 LT |
501 | /* |
502 | * Do not go above this order unless 0 objects fit into the slab. | |
503 | */ | |
504 | #define BREAK_GFP_ORDER_HI 1 | |
505 | #define BREAK_GFP_ORDER_LO 0 | |
506 | static int slab_break_gfp_order = BREAK_GFP_ORDER_LO; | |
507 | ||
a737b3e2 AM |
508 | /* |
509 | * Functions for storing/retrieving the cachep and or slab from the page | |
510 | * allocator. These are used to find the slab an obj belongs to. With kfree(), | |
511 | * these are used to find the cache which an obj belongs to. | |
1da177e4 | 512 | */ |
065d41cb PE |
513 | static inline void page_set_cache(struct page *page, struct kmem_cache *cache) |
514 | { | |
515 | page->lru.next = (struct list_head *)cache; | |
516 | } | |
517 | ||
518 | static inline struct kmem_cache *page_get_cache(struct page *page) | |
519 | { | |
d85f3385 | 520 | page = compound_head(page); |
ddc2e812 | 521 | BUG_ON(!PageSlab(page)); |
065d41cb PE |
522 | return (struct kmem_cache *)page->lru.next; |
523 | } | |
524 | ||
525 | static inline void page_set_slab(struct page *page, struct slab *slab) | |
526 | { | |
527 | page->lru.prev = (struct list_head *)slab; | |
528 | } | |
529 | ||
530 | static inline struct slab *page_get_slab(struct page *page) | |
531 | { | |
ddc2e812 | 532 | BUG_ON(!PageSlab(page)); |
065d41cb PE |
533 | return (struct slab *)page->lru.prev; |
534 | } | |
1da177e4 | 535 | |
6ed5eb22 PE |
536 | static inline struct kmem_cache *virt_to_cache(const void *obj) |
537 | { | |
b49af68f | 538 | struct page *page = virt_to_head_page(obj); |
6ed5eb22 PE |
539 | return page_get_cache(page); |
540 | } | |
541 | ||
542 | static inline struct slab *virt_to_slab(const void *obj) | |
543 | { | |
b49af68f | 544 | struct page *page = virt_to_head_page(obj); |
6ed5eb22 PE |
545 | return page_get_slab(page); |
546 | } | |
547 | ||
8fea4e96 PE |
548 | static inline void *index_to_obj(struct kmem_cache *cache, struct slab *slab, |
549 | unsigned int idx) | |
550 | { | |
551 | return slab->s_mem + cache->buffer_size * idx; | |
552 | } | |
553 | ||
6a2d7a95 ED |
554 | /* |
555 | * We want to avoid an expensive divide : (offset / cache->buffer_size) | |
556 | * Using the fact that buffer_size is a constant for a particular cache, | |
557 | * we can replace (offset / cache->buffer_size) by | |
558 | * reciprocal_divide(offset, cache->reciprocal_buffer_size) | |
559 | */ | |
560 | static inline unsigned int obj_to_index(const struct kmem_cache *cache, | |
561 | const struct slab *slab, void *obj) | |
8fea4e96 | 562 | { |
6a2d7a95 ED |
563 | u32 offset = (obj - slab->s_mem); |
564 | return reciprocal_divide(offset, cache->reciprocal_buffer_size); | |
8fea4e96 PE |
565 | } |
566 | ||
a737b3e2 AM |
567 | /* |
568 | * These are the default caches for kmalloc. Custom caches can have other sizes. | |
569 | */ | |
1da177e4 LT |
570 | struct cache_sizes malloc_sizes[] = { |
571 | #define CACHE(x) { .cs_size = (x) }, | |
572 | #include <linux/kmalloc_sizes.h> | |
573 | CACHE(ULONG_MAX) | |
574 | #undef CACHE | |
575 | }; | |
576 | EXPORT_SYMBOL(malloc_sizes); | |
577 | ||
578 | /* Must match cache_sizes above. Out of line to keep cache footprint low. */ | |
579 | struct cache_names { | |
580 | char *name; | |
581 | char *name_dma; | |
582 | }; | |
583 | ||
584 | static struct cache_names __initdata cache_names[] = { | |
585 | #define CACHE(x) { .name = "size-" #x, .name_dma = "size-" #x "(DMA)" }, | |
586 | #include <linux/kmalloc_sizes.h> | |
b28a02de | 587 | {NULL,} |
1da177e4 LT |
588 | #undef CACHE |
589 | }; | |
590 | ||
591 | static struct arraycache_init initarray_cache __initdata = | |
b28a02de | 592 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 | 593 | static struct arraycache_init initarray_generic = |
b28a02de | 594 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 LT |
595 | |
596 | /* internal cache of cache description objs */ | |
343e0d7a | 597 | static struct kmem_cache cache_cache = { |
b28a02de PE |
598 | .batchcount = 1, |
599 | .limit = BOOT_CPUCACHE_ENTRIES, | |
600 | .shared = 1, | |
343e0d7a | 601 | .buffer_size = sizeof(struct kmem_cache), |
b28a02de | 602 | .name = "kmem_cache", |
1da177e4 LT |
603 | }; |
604 | ||
056c6241 RT |
605 | #define BAD_ALIEN_MAGIC 0x01020304ul |
606 | ||
ce79ddc8 PE |
607 | /* |
608 | * chicken and egg problem: delay the per-cpu array allocation | |
609 | * until the general caches are up. | |
610 | */ | |
611 | static enum { | |
612 | NONE, | |
613 | PARTIAL_AC, | |
614 | PARTIAL_L3, | |
615 | EARLY, | |
616 | FULL | |
617 | } g_cpucache_up; | |
618 | ||
619 | /* | |
620 | * used by boot code to determine if it can use slab based allocator | |
621 | */ | |
622 | int slab_is_available(void) | |
623 | { | |
624 | return g_cpucache_up >= EARLY; | |
625 | } | |
626 | ||
f1aaee53 AV |
627 | #ifdef CONFIG_LOCKDEP |
628 | ||
629 | /* | |
630 | * Slab sometimes uses the kmalloc slabs to store the slab headers | |
631 | * for other slabs "off slab". | |
632 | * The locking for this is tricky in that it nests within the locks | |
633 | * of all other slabs in a few places; to deal with this special | |
634 | * locking we put on-slab caches into a separate lock-class. | |
056c6241 RT |
635 | * |
636 | * We set lock class for alien array caches which are up during init. | |
637 | * The lock annotation will be lost if all cpus of a node goes down and | |
638 | * then comes back up during hotplug | |
f1aaee53 | 639 | */ |
056c6241 RT |
640 | static struct lock_class_key on_slab_l3_key; |
641 | static struct lock_class_key on_slab_alc_key; | |
642 | ||
ce79ddc8 | 643 | static void init_node_lock_keys(int q) |
f1aaee53 | 644 | { |
056c6241 RT |
645 | struct cache_sizes *s = malloc_sizes; |
646 | ||
ce79ddc8 PE |
647 | if (g_cpucache_up != FULL) |
648 | return; | |
649 | ||
650 | for (s = malloc_sizes; s->cs_size != ULONG_MAX; s++) { | |
651 | struct array_cache **alc; | |
652 | struct kmem_list3 *l3; | |
653 | int r; | |
654 | ||
655 | l3 = s->cs_cachep->nodelists[q]; | |
656 | if (!l3 || OFF_SLAB(s->cs_cachep)) | |
00afa758 | 657 | continue; |
ce79ddc8 PE |
658 | lockdep_set_class(&l3->list_lock, &on_slab_l3_key); |
659 | alc = l3->alien; | |
660 | /* | |
661 | * FIXME: This check for BAD_ALIEN_MAGIC | |
662 | * should go away when common slab code is taught to | |
663 | * work even without alien caches. | |
664 | * Currently, non NUMA code returns BAD_ALIEN_MAGIC | |
665 | * for alloc_alien_cache, | |
666 | */ | |
667 | if (!alc || (unsigned long)alc == BAD_ALIEN_MAGIC) | |
00afa758 | 668 | continue; |
ce79ddc8 PE |
669 | for_each_node(r) { |
670 | if (alc[r]) | |
671 | lockdep_set_class(&alc[r]->lock, | |
672 | &on_slab_alc_key); | |
056c6241 | 673 | } |
f1aaee53 AV |
674 | } |
675 | } | |
ce79ddc8 PE |
676 | |
677 | static inline void init_lock_keys(void) | |
678 | { | |
679 | int node; | |
680 | ||
681 | for_each_node(node) | |
682 | init_node_lock_keys(node); | |
683 | } | |
f1aaee53 | 684 | #else |
ce79ddc8 PE |
685 | static void init_node_lock_keys(int q) |
686 | { | |
687 | } | |
688 | ||
056c6241 | 689 | static inline void init_lock_keys(void) |
f1aaee53 AV |
690 | { |
691 | } | |
692 | #endif | |
693 | ||
8f5be20b | 694 | /* |
95402b38 | 695 | * Guard access to the cache-chain. |
8f5be20b | 696 | */ |
fc0abb14 | 697 | static DEFINE_MUTEX(cache_chain_mutex); |
1da177e4 LT |
698 | static struct list_head cache_chain; |
699 | ||
1871e52c | 700 | static DEFINE_PER_CPU(struct delayed_work, slab_reap_work); |
1da177e4 | 701 | |
343e0d7a | 702 | static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) |
1da177e4 LT |
703 | { |
704 | return cachep->array[smp_processor_id()]; | |
705 | } | |
706 | ||
a737b3e2 AM |
707 | static inline struct kmem_cache *__find_general_cachep(size_t size, |
708 | gfp_t gfpflags) | |
1da177e4 LT |
709 | { |
710 | struct cache_sizes *csizep = malloc_sizes; | |
711 | ||
712 | #if DEBUG | |
713 | /* This happens if someone tries to call | |
b28a02de PE |
714 | * kmem_cache_create(), or __kmalloc(), before |
715 | * the generic caches are initialized. | |
716 | */ | |
c7e43c78 | 717 | BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL); |
1da177e4 | 718 | #endif |
6cb8f913 CL |
719 | if (!size) |
720 | return ZERO_SIZE_PTR; | |
721 | ||
1da177e4 LT |
722 | while (size > csizep->cs_size) |
723 | csizep++; | |
724 | ||
725 | /* | |
0abf40c1 | 726 | * Really subtle: The last entry with cs->cs_size==ULONG_MAX |
1da177e4 LT |
727 | * has cs_{dma,}cachep==NULL. Thus no special case |
728 | * for large kmalloc calls required. | |
729 | */ | |
4b51d669 | 730 | #ifdef CONFIG_ZONE_DMA |
1da177e4 LT |
731 | if (unlikely(gfpflags & GFP_DMA)) |
732 | return csizep->cs_dmacachep; | |
4b51d669 | 733 | #endif |
1da177e4 LT |
734 | return csizep->cs_cachep; |
735 | } | |
736 | ||
b221385b | 737 | static struct kmem_cache *kmem_find_general_cachep(size_t size, gfp_t gfpflags) |
97e2bde4 MS |
738 | { |
739 | return __find_general_cachep(size, gfpflags); | |
740 | } | |
97e2bde4 | 741 | |
fbaccacf | 742 | static size_t slab_mgmt_size(size_t nr_objs, size_t align) |
1da177e4 | 743 | { |
fbaccacf SR |
744 | return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align); |
745 | } | |
1da177e4 | 746 | |
a737b3e2 AM |
747 | /* |
748 | * Calculate the number of objects and left-over bytes for a given buffer size. | |
749 | */ | |
fbaccacf SR |
750 | static void cache_estimate(unsigned long gfporder, size_t buffer_size, |
751 | size_t align, int flags, size_t *left_over, | |
752 | unsigned int *num) | |
753 | { | |
754 | int nr_objs; | |
755 | size_t mgmt_size; | |
756 | size_t slab_size = PAGE_SIZE << gfporder; | |
1da177e4 | 757 | |
fbaccacf SR |
758 | /* |
759 | * The slab management structure can be either off the slab or | |
760 | * on it. For the latter case, the memory allocated for a | |
761 | * slab is used for: | |
762 | * | |
763 | * - The struct slab | |
764 | * - One kmem_bufctl_t for each object | |
765 | * - Padding to respect alignment of @align | |
766 | * - @buffer_size bytes for each object | |
767 | * | |
768 | * If the slab management structure is off the slab, then the | |
769 | * alignment will already be calculated into the size. Because | |
770 | * the slabs are all pages aligned, the objects will be at the | |
771 | * correct alignment when allocated. | |
772 | */ | |
773 | if (flags & CFLGS_OFF_SLAB) { | |
774 | mgmt_size = 0; | |
775 | nr_objs = slab_size / buffer_size; | |
776 | ||
777 | if (nr_objs > SLAB_LIMIT) | |
778 | nr_objs = SLAB_LIMIT; | |
779 | } else { | |
780 | /* | |
781 | * Ignore padding for the initial guess. The padding | |
782 | * is at most @align-1 bytes, and @buffer_size is at | |
783 | * least @align. In the worst case, this result will | |
784 | * be one greater than the number of objects that fit | |
785 | * into the memory allocation when taking the padding | |
786 | * into account. | |
787 | */ | |
788 | nr_objs = (slab_size - sizeof(struct slab)) / | |
789 | (buffer_size + sizeof(kmem_bufctl_t)); | |
790 | ||
791 | /* | |
792 | * This calculated number will be either the right | |
793 | * amount, or one greater than what we want. | |
794 | */ | |
795 | if (slab_mgmt_size(nr_objs, align) + nr_objs*buffer_size | |
796 | > slab_size) | |
797 | nr_objs--; | |
798 | ||
799 | if (nr_objs > SLAB_LIMIT) | |
800 | nr_objs = SLAB_LIMIT; | |
801 | ||
802 | mgmt_size = slab_mgmt_size(nr_objs, align); | |
803 | } | |
804 | *num = nr_objs; | |
805 | *left_over = slab_size - nr_objs*buffer_size - mgmt_size; | |
1da177e4 LT |
806 | } |
807 | ||
d40cee24 | 808 | #define slab_error(cachep, msg) __slab_error(__func__, cachep, msg) |
1da177e4 | 809 | |
a737b3e2 AM |
810 | static void __slab_error(const char *function, struct kmem_cache *cachep, |
811 | char *msg) | |
1da177e4 LT |
812 | { |
813 | printk(KERN_ERR "slab error in %s(): cache `%s': %s\n", | |
b28a02de | 814 | function, cachep->name, msg); |
1da177e4 LT |
815 | dump_stack(); |
816 | } | |
817 | ||
3395ee05 PM |
818 | /* |
819 | * By default on NUMA we use alien caches to stage the freeing of | |
820 | * objects allocated from other nodes. This causes massive memory | |
821 | * inefficiencies when using fake NUMA setup to split memory into a | |
822 | * large number of small nodes, so it can be disabled on the command | |
823 | * line | |
824 | */ | |
825 | ||
826 | static int use_alien_caches __read_mostly = 1; | |
827 | static int __init noaliencache_setup(char *s) | |
828 | { | |
829 | use_alien_caches = 0; | |
830 | return 1; | |
831 | } | |
832 | __setup("noaliencache", noaliencache_setup); | |
833 | ||
8fce4d8e CL |
834 | #ifdef CONFIG_NUMA |
835 | /* | |
836 | * Special reaping functions for NUMA systems called from cache_reap(). | |
837 | * These take care of doing round robin flushing of alien caches (containing | |
838 | * objects freed on different nodes from which they were allocated) and the | |
839 | * flushing of remote pcps by calling drain_node_pages. | |
840 | */ | |
1871e52c | 841 | static DEFINE_PER_CPU(unsigned long, slab_reap_node); |
8fce4d8e CL |
842 | |
843 | static void init_reap_node(int cpu) | |
844 | { | |
845 | int node; | |
846 | ||
847 | node = next_node(cpu_to_node(cpu), node_online_map); | |
848 | if (node == MAX_NUMNODES) | |
442295c9 | 849 | node = first_node(node_online_map); |
8fce4d8e | 850 | |
1871e52c | 851 | per_cpu(slab_reap_node, cpu) = node; |
8fce4d8e CL |
852 | } |
853 | ||
854 | static void next_reap_node(void) | |
855 | { | |
1871e52c | 856 | int node = __get_cpu_var(slab_reap_node); |
8fce4d8e | 857 | |
8fce4d8e CL |
858 | node = next_node(node, node_online_map); |
859 | if (unlikely(node >= MAX_NUMNODES)) | |
860 | node = first_node(node_online_map); | |
1871e52c | 861 | __get_cpu_var(slab_reap_node) = node; |
8fce4d8e CL |
862 | } |
863 | ||
864 | #else | |
865 | #define init_reap_node(cpu) do { } while (0) | |
866 | #define next_reap_node(void) do { } while (0) | |
867 | #endif | |
868 | ||
1da177e4 LT |
869 | /* |
870 | * Initiate the reap timer running on the target CPU. We run at around 1 to 2Hz | |
871 | * via the workqueue/eventd. | |
872 | * Add the CPU number into the expiration time to minimize the possibility of | |
873 | * the CPUs getting into lockstep and contending for the global cache chain | |
874 | * lock. | |
875 | */ | |
897e679b | 876 | static void __cpuinit start_cpu_timer(int cpu) |
1da177e4 | 877 | { |
1871e52c | 878 | struct delayed_work *reap_work = &per_cpu(slab_reap_work, cpu); |
1da177e4 LT |
879 | |
880 | /* | |
881 | * When this gets called from do_initcalls via cpucache_init(), | |
882 | * init_workqueues() has already run, so keventd will be setup | |
883 | * at that time. | |
884 | */ | |
52bad64d | 885 | if (keventd_up() && reap_work->work.func == NULL) { |
8fce4d8e | 886 | init_reap_node(cpu); |
65f27f38 | 887 | INIT_DELAYED_WORK(reap_work, cache_reap); |
2b284214 AV |
888 | schedule_delayed_work_on(cpu, reap_work, |
889 | __round_jiffies_relative(HZ, cpu)); | |
1da177e4 LT |
890 | } |
891 | } | |
892 | ||
e498be7d | 893 | static struct array_cache *alloc_arraycache(int node, int entries, |
83b519e8 | 894 | int batchcount, gfp_t gfp) |
1da177e4 | 895 | { |
b28a02de | 896 | int memsize = sizeof(void *) * entries + sizeof(struct array_cache); |
1da177e4 LT |
897 | struct array_cache *nc = NULL; |
898 | ||
83b519e8 | 899 | nc = kmalloc_node(memsize, gfp, node); |
d5cff635 CM |
900 | /* |
901 | * The array_cache structures contain pointers to free object. | |
902 | * However, when such objects are allocated or transfered to another | |
903 | * cache the pointers are not cleared and they could be counted as | |
904 | * valid references during a kmemleak scan. Therefore, kmemleak must | |
905 | * not scan such objects. | |
906 | */ | |
907 | kmemleak_no_scan(nc); | |
1da177e4 LT |
908 | if (nc) { |
909 | nc->avail = 0; | |
910 | nc->limit = entries; | |
911 | nc->batchcount = batchcount; | |
912 | nc->touched = 0; | |
e498be7d | 913 | spin_lock_init(&nc->lock); |
1da177e4 LT |
914 | } |
915 | return nc; | |
916 | } | |
917 | ||
3ded175a CL |
918 | /* |
919 | * Transfer objects in one arraycache to another. | |
920 | * Locking must be handled by the caller. | |
921 | * | |
922 | * Return the number of entries transferred. | |
923 | */ | |
924 | static int transfer_objects(struct array_cache *to, | |
925 | struct array_cache *from, unsigned int max) | |
926 | { | |
927 | /* Figure out how many entries to transfer */ | |
928 | int nr = min(min(from->avail, max), to->limit - to->avail); | |
929 | ||
930 | if (!nr) | |
931 | return 0; | |
932 | ||
933 | memcpy(to->entry + to->avail, from->entry + from->avail -nr, | |
934 | sizeof(void *) *nr); | |
935 | ||
936 | from->avail -= nr; | |
937 | to->avail += nr; | |
3ded175a CL |
938 | return nr; |
939 | } | |
940 | ||
765c4507 CL |
941 | #ifndef CONFIG_NUMA |
942 | ||
943 | #define drain_alien_cache(cachep, alien) do { } while (0) | |
944 | #define reap_alien(cachep, l3) do { } while (0) | |
945 | ||
83b519e8 | 946 | static inline struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) |
765c4507 CL |
947 | { |
948 | return (struct array_cache **)BAD_ALIEN_MAGIC; | |
949 | } | |
950 | ||
951 | static inline void free_alien_cache(struct array_cache **ac_ptr) | |
952 | { | |
953 | } | |
954 | ||
955 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) | |
956 | { | |
957 | return 0; | |
958 | } | |
959 | ||
960 | static inline void *alternate_node_alloc(struct kmem_cache *cachep, | |
961 | gfp_t flags) | |
962 | { | |
963 | return NULL; | |
964 | } | |
965 | ||
8b98c169 | 966 | static inline void *____cache_alloc_node(struct kmem_cache *cachep, |
765c4507 CL |
967 | gfp_t flags, int nodeid) |
968 | { | |
969 | return NULL; | |
970 | } | |
971 | ||
972 | #else /* CONFIG_NUMA */ | |
973 | ||
8b98c169 | 974 | static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int); |
c61afb18 | 975 | static void *alternate_node_alloc(struct kmem_cache *, gfp_t); |
dc85da15 | 976 | |
83b519e8 | 977 | static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) |
e498be7d CL |
978 | { |
979 | struct array_cache **ac_ptr; | |
8ef82866 | 980 | int memsize = sizeof(void *) * nr_node_ids; |
e498be7d CL |
981 | int i; |
982 | ||
983 | if (limit > 1) | |
984 | limit = 12; | |
f3186a9c | 985 | ac_ptr = kzalloc_node(memsize, gfp, node); |
e498be7d CL |
986 | if (ac_ptr) { |
987 | for_each_node(i) { | |
f3186a9c | 988 | if (i == node || !node_online(i)) |
e498be7d | 989 | continue; |
83b519e8 | 990 | ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp); |
e498be7d | 991 | if (!ac_ptr[i]) { |
cc550def | 992 | for (i--; i >= 0; i--) |
e498be7d CL |
993 | kfree(ac_ptr[i]); |
994 | kfree(ac_ptr); | |
995 | return NULL; | |
996 | } | |
997 | } | |
998 | } | |
999 | return ac_ptr; | |
1000 | } | |
1001 | ||
5295a74c | 1002 | static void free_alien_cache(struct array_cache **ac_ptr) |
e498be7d CL |
1003 | { |
1004 | int i; | |
1005 | ||
1006 | if (!ac_ptr) | |
1007 | return; | |
e498be7d | 1008 | for_each_node(i) |
b28a02de | 1009 | kfree(ac_ptr[i]); |
e498be7d CL |
1010 | kfree(ac_ptr); |
1011 | } | |
1012 | ||
343e0d7a | 1013 | static void __drain_alien_cache(struct kmem_cache *cachep, |
5295a74c | 1014 | struct array_cache *ac, int node) |
e498be7d CL |
1015 | { |
1016 | struct kmem_list3 *rl3 = cachep->nodelists[node]; | |
1017 | ||
1018 | if (ac->avail) { | |
1019 | spin_lock(&rl3->list_lock); | |
e00946fe CL |
1020 | /* |
1021 | * Stuff objects into the remote nodes shared array first. | |
1022 | * That way we could avoid the overhead of putting the objects | |
1023 | * into the free lists and getting them back later. | |
1024 | */ | |
693f7d36 | 1025 | if (rl3->shared) |
1026 | transfer_objects(rl3->shared, ac, ac->limit); | |
e00946fe | 1027 | |
ff69416e | 1028 | free_block(cachep, ac->entry, ac->avail, node); |
e498be7d CL |
1029 | ac->avail = 0; |
1030 | spin_unlock(&rl3->list_lock); | |
1031 | } | |
1032 | } | |
1033 | ||
8fce4d8e CL |
1034 | /* |
1035 | * Called from cache_reap() to regularly drain alien caches round robin. | |
1036 | */ | |
1037 | static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3) | |
1038 | { | |
1871e52c | 1039 | int node = __get_cpu_var(slab_reap_node); |
8fce4d8e CL |
1040 | |
1041 | if (l3->alien) { | |
1042 | struct array_cache *ac = l3->alien[node]; | |
e00946fe CL |
1043 | |
1044 | if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { | |
8fce4d8e CL |
1045 | __drain_alien_cache(cachep, ac, node); |
1046 | spin_unlock_irq(&ac->lock); | |
1047 | } | |
1048 | } | |
1049 | } | |
1050 | ||
a737b3e2 AM |
1051 | static void drain_alien_cache(struct kmem_cache *cachep, |
1052 | struct array_cache **alien) | |
e498be7d | 1053 | { |
b28a02de | 1054 | int i = 0; |
e498be7d CL |
1055 | struct array_cache *ac; |
1056 | unsigned long flags; | |
1057 | ||
1058 | for_each_online_node(i) { | |
4484ebf1 | 1059 | ac = alien[i]; |
e498be7d CL |
1060 | if (ac) { |
1061 | spin_lock_irqsave(&ac->lock, flags); | |
1062 | __drain_alien_cache(cachep, ac, i); | |
1063 | spin_unlock_irqrestore(&ac->lock, flags); | |
1064 | } | |
1065 | } | |
1066 | } | |
729bd0b7 | 1067 | |
873623df | 1068 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) |
729bd0b7 PE |
1069 | { |
1070 | struct slab *slabp = virt_to_slab(objp); | |
1071 | int nodeid = slabp->nodeid; | |
1072 | struct kmem_list3 *l3; | |
1073 | struct array_cache *alien = NULL; | |
1ca4cb24 PE |
1074 | int node; |
1075 | ||
1076 | node = numa_node_id(); | |
729bd0b7 PE |
1077 | |
1078 | /* | |
1079 | * Make sure we are not freeing a object from another node to the array | |
1080 | * cache on this cpu. | |
1081 | */ | |
62918a03 | 1082 | if (likely(slabp->nodeid == node)) |
729bd0b7 PE |
1083 | return 0; |
1084 | ||
1ca4cb24 | 1085 | l3 = cachep->nodelists[node]; |
729bd0b7 PE |
1086 | STATS_INC_NODEFREES(cachep); |
1087 | if (l3->alien && l3->alien[nodeid]) { | |
1088 | alien = l3->alien[nodeid]; | |
873623df | 1089 | spin_lock(&alien->lock); |
729bd0b7 PE |
1090 | if (unlikely(alien->avail == alien->limit)) { |
1091 | STATS_INC_ACOVERFLOW(cachep); | |
1092 | __drain_alien_cache(cachep, alien, nodeid); | |
1093 | } | |
1094 | alien->entry[alien->avail++] = objp; | |
1095 | spin_unlock(&alien->lock); | |
1096 | } else { | |
1097 | spin_lock(&(cachep->nodelists[nodeid])->list_lock); | |
1098 | free_block(cachep, &objp, 1, nodeid); | |
1099 | spin_unlock(&(cachep->nodelists[nodeid])->list_lock); | |
1100 | } | |
1101 | return 1; | |
1102 | } | |
e498be7d CL |
1103 | #endif |
1104 | ||
fbf1e473 AM |
1105 | static void __cpuinit cpuup_canceled(long cpu) |
1106 | { | |
1107 | struct kmem_cache *cachep; | |
1108 | struct kmem_list3 *l3 = NULL; | |
1109 | int node = cpu_to_node(cpu); | |
a70f7302 | 1110 | const struct cpumask *mask = cpumask_of_node(node); |
fbf1e473 AM |
1111 | |
1112 | list_for_each_entry(cachep, &cache_chain, next) { | |
1113 | struct array_cache *nc; | |
1114 | struct array_cache *shared; | |
1115 | struct array_cache **alien; | |
fbf1e473 | 1116 | |
fbf1e473 AM |
1117 | /* cpu is dead; no one can alloc from it. */ |
1118 | nc = cachep->array[cpu]; | |
1119 | cachep->array[cpu] = NULL; | |
1120 | l3 = cachep->nodelists[node]; | |
1121 | ||
1122 | if (!l3) | |
1123 | goto free_array_cache; | |
1124 | ||
1125 | spin_lock_irq(&l3->list_lock); | |
1126 | ||
1127 | /* Free limit for this kmem_list3 */ | |
1128 | l3->free_limit -= cachep->batchcount; | |
1129 | if (nc) | |
1130 | free_block(cachep, nc->entry, nc->avail, node); | |
1131 | ||
58463c1f | 1132 | if (!cpumask_empty(mask)) { |
fbf1e473 AM |
1133 | spin_unlock_irq(&l3->list_lock); |
1134 | goto free_array_cache; | |
1135 | } | |
1136 | ||
1137 | shared = l3->shared; | |
1138 | if (shared) { | |
1139 | free_block(cachep, shared->entry, | |
1140 | shared->avail, node); | |
1141 | l3->shared = NULL; | |
1142 | } | |
1143 | ||
1144 | alien = l3->alien; | |
1145 | l3->alien = NULL; | |
1146 | ||
1147 | spin_unlock_irq(&l3->list_lock); | |
1148 | ||
1149 | kfree(shared); | |
1150 | if (alien) { | |
1151 | drain_alien_cache(cachep, alien); | |
1152 | free_alien_cache(alien); | |
1153 | } | |
1154 | free_array_cache: | |
1155 | kfree(nc); | |
1156 | } | |
1157 | /* | |
1158 | * In the previous loop, all the objects were freed to | |
1159 | * the respective cache's slabs, now we can go ahead and | |
1160 | * shrink each nodelist to its limit. | |
1161 | */ | |
1162 | list_for_each_entry(cachep, &cache_chain, next) { | |
1163 | l3 = cachep->nodelists[node]; | |
1164 | if (!l3) | |
1165 | continue; | |
1166 | drain_freelist(cachep, l3, l3->free_objects); | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | static int __cpuinit cpuup_prepare(long cpu) | |
1da177e4 | 1171 | { |
343e0d7a | 1172 | struct kmem_cache *cachep; |
e498be7d CL |
1173 | struct kmem_list3 *l3 = NULL; |
1174 | int node = cpu_to_node(cpu); | |
ea02e3dd | 1175 | const int memsize = sizeof(struct kmem_list3); |
1da177e4 | 1176 | |
fbf1e473 AM |
1177 | /* |
1178 | * We need to do this right in the beginning since | |
1179 | * alloc_arraycache's are going to use this list. | |
1180 | * kmalloc_node allows us to add the slab to the right | |
1181 | * kmem_list3 and not this cpu's kmem_list3 | |
1182 | */ | |
1183 | ||
1184 | list_for_each_entry(cachep, &cache_chain, next) { | |
a737b3e2 | 1185 | /* |
fbf1e473 AM |
1186 | * Set up the size64 kmemlist for cpu before we can |
1187 | * begin anything. Make sure some other cpu on this | |
1188 | * node has not already allocated this | |
e498be7d | 1189 | */ |
fbf1e473 AM |
1190 | if (!cachep->nodelists[node]) { |
1191 | l3 = kmalloc_node(memsize, GFP_KERNEL, node); | |
1192 | if (!l3) | |
1193 | goto bad; | |
1194 | kmem_list3_init(l3); | |
1195 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
1196 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
e498be7d | 1197 | |
a737b3e2 | 1198 | /* |
fbf1e473 AM |
1199 | * The l3s don't come and go as CPUs come and |
1200 | * go. cache_chain_mutex is sufficient | |
1201 | * protection here. | |
e498be7d | 1202 | */ |
fbf1e473 | 1203 | cachep->nodelists[node] = l3; |
e498be7d CL |
1204 | } |
1205 | ||
fbf1e473 AM |
1206 | spin_lock_irq(&cachep->nodelists[node]->list_lock); |
1207 | cachep->nodelists[node]->free_limit = | |
1208 | (1 + nr_cpus_node(node)) * | |
1209 | cachep->batchcount + cachep->num; | |
1210 | spin_unlock_irq(&cachep->nodelists[node]->list_lock); | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * Now we can go ahead with allocating the shared arrays and | |
1215 | * array caches | |
1216 | */ | |
1217 | list_for_each_entry(cachep, &cache_chain, next) { | |
1218 | struct array_cache *nc; | |
1219 | struct array_cache *shared = NULL; | |
1220 | struct array_cache **alien = NULL; | |
1221 | ||
1222 | nc = alloc_arraycache(node, cachep->limit, | |
83b519e8 | 1223 | cachep->batchcount, GFP_KERNEL); |
fbf1e473 AM |
1224 | if (!nc) |
1225 | goto bad; | |
1226 | if (cachep->shared) { | |
1227 | shared = alloc_arraycache(node, | |
1228 | cachep->shared * cachep->batchcount, | |
83b519e8 | 1229 | 0xbaadf00d, GFP_KERNEL); |
12d00f6a AM |
1230 | if (!shared) { |
1231 | kfree(nc); | |
1da177e4 | 1232 | goto bad; |
12d00f6a | 1233 | } |
fbf1e473 AM |
1234 | } |
1235 | if (use_alien_caches) { | |
83b519e8 | 1236 | alien = alloc_alien_cache(node, cachep->limit, GFP_KERNEL); |
12d00f6a AM |
1237 | if (!alien) { |
1238 | kfree(shared); | |
1239 | kfree(nc); | |
fbf1e473 | 1240 | goto bad; |
12d00f6a | 1241 | } |
fbf1e473 AM |
1242 | } |
1243 | cachep->array[cpu] = nc; | |
1244 | l3 = cachep->nodelists[node]; | |
1245 | BUG_ON(!l3); | |
1246 | ||
1247 | spin_lock_irq(&l3->list_lock); | |
1248 | if (!l3->shared) { | |
1249 | /* | |
1250 | * We are serialised from CPU_DEAD or | |
1251 | * CPU_UP_CANCELLED by the cpucontrol lock | |
1252 | */ | |
1253 | l3->shared = shared; | |
1254 | shared = NULL; | |
1255 | } | |
4484ebf1 | 1256 | #ifdef CONFIG_NUMA |
fbf1e473 AM |
1257 | if (!l3->alien) { |
1258 | l3->alien = alien; | |
1259 | alien = NULL; | |
1da177e4 | 1260 | } |
fbf1e473 AM |
1261 | #endif |
1262 | spin_unlock_irq(&l3->list_lock); | |
1263 | kfree(shared); | |
1264 | free_alien_cache(alien); | |
1265 | } | |
ce79ddc8 PE |
1266 | init_node_lock_keys(node); |
1267 | ||
fbf1e473 AM |
1268 | return 0; |
1269 | bad: | |
12d00f6a | 1270 | cpuup_canceled(cpu); |
fbf1e473 AM |
1271 | return -ENOMEM; |
1272 | } | |
1273 | ||
1274 | static int __cpuinit cpuup_callback(struct notifier_block *nfb, | |
1275 | unsigned long action, void *hcpu) | |
1276 | { | |
1277 | long cpu = (long)hcpu; | |
1278 | int err = 0; | |
1279 | ||
1280 | switch (action) { | |
fbf1e473 AM |
1281 | case CPU_UP_PREPARE: |
1282 | case CPU_UP_PREPARE_FROZEN: | |
95402b38 | 1283 | mutex_lock(&cache_chain_mutex); |
fbf1e473 | 1284 | err = cpuup_prepare(cpu); |
95402b38 | 1285 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
1286 | break; |
1287 | case CPU_ONLINE: | |
8bb78442 | 1288 | case CPU_ONLINE_FROZEN: |
1da177e4 LT |
1289 | start_cpu_timer(cpu); |
1290 | break; | |
1291 | #ifdef CONFIG_HOTPLUG_CPU | |
5830c590 | 1292 | case CPU_DOWN_PREPARE: |
8bb78442 | 1293 | case CPU_DOWN_PREPARE_FROZEN: |
5830c590 CL |
1294 | /* |
1295 | * Shutdown cache reaper. Note that the cache_chain_mutex is | |
1296 | * held so that if cache_reap() is invoked it cannot do | |
1297 | * anything expensive but will only modify reap_work | |
1298 | * and reschedule the timer. | |
1299 | */ | |
1871e52c | 1300 | cancel_rearming_delayed_work(&per_cpu(slab_reap_work, cpu)); |
5830c590 | 1301 | /* Now the cache_reaper is guaranteed to be not running. */ |
1871e52c | 1302 | per_cpu(slab_reap_work, cpu).work.func = NULL; |
5830c590 CL |
1303 | break; |
1304 | case CPU_DOWN_FAILED: | |
8bb78442 | 1305 | case CPU_DOWN_FAILED_FROZEN: |
5830c590 CL |
1306 | start_cpu_timer(cpu); |
1307 | break; | |
1da177e4 | 1308 | case CPU_DEAD: |
8bb78442 | 1309 | case CPU_DEAD_FROZEN: |
4484ebf1 RT |
1310 | /* |
1311 | * Even if all the cpus of a node are down, we don't free the | |
1312 | * kmem_list3 of any cache. This to avoid a race between | |
1313 | * cpu_down, and a kmalloc allocation from another cpu for | |
1314 | * memory from the node of the cpu going down. The list3 | |
1315 | * structure is usually allocated from kmem_cache_create() and | |
1316 | * gets destroyed at kmem_cache_destroy(). | |
1317 | */ | |
183ff22b | 1318 | /* fall through */ |
8f5be20b | 1319 | #endif |
1da177e4 | 1320 | case CPU_UP_CANCELED: |
8bb78442 | 1321 | case CPU_UP_CANCELED_FROZEN: |
95402b38 | 1322 | mutex_lock(&cache_chain_mutex); |
fbf1e473 | 1323 | cpuup_canceled(cpu); |
fc0abb14 | 1324 | mutex_unlock(&cache_chain_mutex); |
1da177e4 | 1325 | break; |
1da177e4 | 1326 | } |
fbf1e473 | 1327 | return err ? NOTIFY_BAD : NOTIFY_OK; |
1da177e4 LT |
1328 | } |
1329 | ||
74b85f37 CS |
1330 | static struct notifier_block __cpuinitdata cpucache_notifier = { |
1331 | &cpuup_callback, NULL, 0 | |
1332 | }; | |
1da177e4 | 1333 | |
e498be7d CL |
1334 | /* |
1335 | * swap the static kmem_list3 with kmalloced memory | |
1336 | */ | |
a737b3e2 AM |
1337 | static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, |
1338 | int nodeid) | |
e498be7d CL |
1339 | { |
1340 | struct kmem_list3 *ptr; | |
1341 | ||
83b519e8 | 1342 | ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_NOWAIT, nodeid); |
e498be7d CL |
1343 | BUG_ON(!ptr); |
1344 | ||
e498be7d | 1345 | memcpy(ptr, list, sizeof(struct kmem_list3)); |
2b2d5493 IM |
1346 | /* |
1347 | * Do not assume that spinlocks can be initialized via memcpy: | |
1348 | */ | |
1349 | spin_lock_init(&ptr->list_lock); | |
1350 | ||
e498be7d CL |
1351 | MAKE_ALL_LISTS(cachep, ptr, nodeid); |
1352 | cachep->nodelists[nodeid] = ptr; | |
e498be7d CL |
1353 | } |
1354 | ||
556a169d PE |
1355 | /* |
1356 | * For setting up all the kmem_list3s for cache whose buffer_size is same as | |
1357 | * size of kmem_list3. | |
1358 | */ | |
1359 | static void __init set_up_list3s(struct kmem_cache *cachep, int index) | |
1360 | { | |
1361 | int node; | |
1362 | ||
1363 | for_each_online_node(node) { | |
1364 | cachep->nodelists[node] = &initkmem_list3[index + node]; | |
1365 | cachep->nodelists[node]->next_reap = jiffies + | |
1366 | REAPTIMEOUT_LIST3 + | |
1367 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
1368 | } | |
1369 | } | |
1370 | ||
a737b3e2 AM |
1371 | /* |
1372 | * Initialisation. Called after the page allocator have been initialised and | |
1373 | * before smp_init(). | |
1da177e4 LT |
1374 | */ |
1375 | void __init kmem_cache_init(void) | |
1376 | { | |
1377 | size_t left_over; | |
1378 | struct cache_sizes *sizes; | |
1379 | struct cache_names *names; | |
e498be7d | 1380 | int i; |
07ed76b2 | 1381 | int order; |
1ca4cb24 | 1382 | int node; |
e498be7d | 1383 | |
b6e68bc1 | 1384 | if (num_possible_nodes() == 1) |
62918a03 SS |
1385 | use_alien_caches = 0; |
1386 | ||
e498be7d CL |
1387 | for (i = 0; i < NUM_INIT_LISTS; i++) { |
1388 | kmem_list3_init(&initkmem_list3[i]); | |
1389 | if (i < MAX_NUMNODES) | |
1390 | cache_cache.nodelists[i] = NULL; | |
1391 | } | |
556a169d | 1392 | set_up_list3s(&cache_cache, CACHE_CACHE); |
1da177e4 LT |
1393 | |
1394 | /* | |
1395 | * Fragmentation resistance on low memory - only use bigger | |
1396 | * page orders on machines with more than 32MB of memory. | |
1397 | */ | |
4481374c | 1398 | if (totalram_pages > (32 << 20) >> PAGE_SHIFT) |
1da177e4 LT |
1399 | slab_break_gfp_order = BREAK_GFP_ORDER_HI; |
1400 | ||
1da177e4 LT |
1401 | /* Bootstrap is tricky, because several objects are allocated |
1402 | * from caches that do not exist yet: | |
a737b3e2 AM |
1403 | * 1) initialize the cache_cache cache: it contains the struct |
1404 | * kmem_cache structures of all caches, except cache_cache itself: | |
1405 | * cache_cache is statically allocated. | |
e498be7d CL |
1406 | * Initially an __init data area is used for the head array and the |
1407 | * kmem_list3 structures, it's replaced with a kmalloc allocated | |
1408 | * array at the end of the bootstrap. | |
1da177e4 | 1409 | * 2) Create the first kmalloc cache. |
343e0d7a | 1410 | * The struct kmem_cache for the new cache is allocated normally. |
e498be7d CL |
1411 | * An __init data area is used for the head array. |
1412 | * 3) Create the remaining kmalloc caches, with minimally sized | |
1413 | * head arrays. | |
1da177e4 LT |
1414 | * 4) Replace the __init data head arrays for cache_cache and the first |
1415 | * kmalloc cache with kmalloc allocated arrays. | |
e498be7d CL |
1416 | * 5) Replace the __init data for kmem_list3 for cache_cache and |
1417 | * the other cache's with kmalloc allocated memory. | |
1418 | * 6) Resize the head arrays of the kmalloc caches to their final sizes. | |
1da177e4 LT |
1419 | */ |
1420 | ||
1ca4cb24 PE |
1421 | node = numa_node_id(); |
1422 | ||
1da177e4 | 1423 | /* 1) create the cache_cache */ |
1da177e4 LT |
1424 | INIT_LIST_HEAD(&cache_chain); |
1425 | list_add(&cache_cache.next, &cache_chain); | |
1426 | cache_cache.colour_off = cache_line_size(); | |
1427 | cache_cache.array[smp_processor_id()] = &initarray_cache.cache; | |
ec1f5eee | 1428 | cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE + node]; |
1da177e4 | 1429 | |
8da3430d ED |
1430 | /* |
1431 | * struct kmem_cache size depends on nr_node_ids, which | |
1432 | * can be less than MAX_NUMNODES. | |
1433 | */ | |
1434 | cache_cache.buffer_size = offsetof(struct kmem_cache, nodelists) + | |
1435 | nr_node_ids * sizeof(struct kmem_list3 *); | |
1436 | #if DEBUG | |
1437 | cache_cache.obj_size = cache_cache.buffer_size; | |
1438 | #endif | |
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, | |
20c2df83 | 1470 | 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, | |
20c2df83 | 1478 | NULL); |
a737b3e2 | 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, | |
20c2df83 | 1496 | NULL); |
a737b3e2 | 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, | |
20c2df83 | 1505 | 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 | |
83b519e8 | 1514 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); |
e498be7d | 1515 | |
9a2dba4b PE |
1516 | BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); |
1517 | memcpy(ptr, cpu_cache_get(&cache_cache), | |
b28a02de | 1518 | sizeof(struct arraycache_init)); |
2b2d5493 IM |
1519 | /* |
1520 | * Do not assume that spinlocks can be initialized via memcpy: | |
1521 | */ | |
1522 | spin_lock_init(&ptr->lock); | |
1523 | ||
1da177e4 | 1524 | cache_cache.array[smp_processor_id()] = ptr; |
e498be7d | 1525 | |
83b519e8 | 1526 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); |
e498be7d | 1527 | |
9a2dba4b | 1528 | BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep) |
b28a02de | 1529 | != &initarray_generic.cache); |
9a2dba4b | 1530 | memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), |
b28a02de | 1531 | sizeof(struct arraycache_init)); |
2b2d5493 IM |
1532 | /* |
1533 | * Do not assume that spinlocks can be initialized via memcpy: | |
1534 | */ | |
1535 | spin_lock_init(&ptr->lock); | |
1536 | ||
e498be7d | 1537 | malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = |
b28a02de | 1538 | ptr; |
1da177e4 | 1539 | } |
e498be7d CL |
1540 | /* 5) Replace the bootstrap kmem_list3's */ |
1541 | { | |
1ca4cb24 PE |
1542 | int nid; |
1543 | ||
9c09a95c | 1544 | for_each_online_node(nid) { |
ec1f5eee | 1545 | init_list(&cache_cache, &initkmem_list3[CACHE_CACHE + nid], nid); |
556a169d | 1546 | |
e498be7d | 1547 | init_list(malloc_sizes[INDEX_AC].cs_cachep, |
1ca4cb24 | 1548 | &initkmem_list3[SIZE_AC + nid], nid); |
e498be7d CL |
1549 | |
1550 | if (INDEX_AC != INDEX_L3) { | |
1551 | init_list(malloc_sizes[INDEX_L3].cs_cachep, | |
1ca4cb24 | 1552 | &initkmem_list3[SIZE_L3 + nid], nid); |
e498be7d CL |
1553 | } |
1554 | } | |
1555 | } | |
1da177e4 | 1556 | |
8429db5c | 1557 | g_cpucache_up = EARLY; |
8429db5c PE |
1558 | } |
1559 | ||
1560 | void __init kmem_cache_init_late(void) | |
1561 | { | |
1562 | struct kmem_cache *cachep; | |
1563 | ||
8429db5c PE |
1564 | /* 6) resize the head arrays to their final sizes */ |
1565 | mutex_lock(&cache_chain_mutex); | |
1566 | list_for_each_entry(cachep, &cache_chain, next) | |
1567 | if (enable_cpucache(cachep, GFP_NOWAIT)) | |
1568 | BUG(); | |
1569 | mutex_unlock(&cache_chain_mutex); | |
056c6241 | 1570 | |
1da177e4 LT |
1571 | /* Done! */ |
1572 | g_cpucache_up = FULL; | |
1573 | ||
ec5a36f9 PE |
1574 | /* Annotate slab for lockdep -- annotate the malloc caches */ |
1575 | init_lock_keys(); | |
1576 | ||
a737b3e2 AM |
1577 | /* |
1578 | * Register a cpu startup notifier callback that initializes | |
1579 | * cpu_cache_get for all new cpus | |
1da177e4 LT |
1580 | */ |
1581 | register_cpu_notifier(&cpucache_notifier); | |
1da177e4 | 1582 | |
a737b3e2 AM |
1583 | /* |
1584 | * The reap timers are started later, with a module init call: That part | |
1585 | * of the kernel is not yet operational. | |
1da177e4 LT |
1586 | */ |
1587 | } | |
1588 | ||
1589 | static int __init cpucache_init(void) | |
1590 | { | |
1591 | int cpu; | |
1592 | ||
a737b3e2 AM |
1593 | /* |
1594 | * Register the timers that return unneeded pages to the page allocator | |
1da177e4 | 1595 | */ |
e498be7d | 1596 | for_each_online_cpu(cpu) |
a737b3e2 | 1597 | start_cpu_timer(cpu); |
1da177e4 LT |
1598 | return 0; |
1599 | } | |
1da177e4 LT |
1600 | __initcall(cpucache_init); |
1601 | ||
1602 | /* | |
1603 | * Interface to system's page allocator. No need to hold the cache-lock. | |
1604 | * | |
1605 | * If we requested dmaable memory, we will get it. Even if we | |
1606 | * did not request dmaable memory, we might get it, but that | |
1607 | * would be relatively rare and ignorable. | |
1608 | */ | |
343e0d7a | 1609 | static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
1da177e4 LT |
1610 | { |
1611 | struct page *page; | |
e1b6aa6f | 1612 | int nr_pages; |
1da177e4 LT |
1613 | int i; |
1614 | ||
d6fef9da | 1615 | #ifndef CONFIG_MMU |
e1b6aa6f CH |
1616 | /* |
1617 | * Nommu uses slab's for process anonymous memory allocations, and thus | |
1618 | * requires __GFP_COMP to properly refcount higher order allocations | |
d6fef9da | 1619 | */ |
e1b6aa6f | 1620 | flags |= __GFP_COMP; |
d6fef9da | 1621 | #endif |
765c4507 | 1622 | |
3c517a61 | 1623 | flags |= cachep->gfpflags; |
e12ba74d MG |
1624 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
1625 | flags |= __GFP_RECLAIMABLE; | |
e1b6aa6f | 1626 | |
517d0869 | 1627 | page = alloc_pages_exact_node(nodeid, flags | __GFP_NOTRACK, 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); | |
c175eea4 | 1640 | |
b1eeab67 VN |
1641 | if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK)) { |
1642 | kmemcheck_alloc_shadow(page, cachep->gfporder, flags, nodeid); | |
1643 | ||
1644 | if (cachep->ctor) | |
1645 | kmemcheck_mark_uninitialized_pages(page, nr_pages); | |
1646 | else | |
1647 | kmemcheck_mark_unallocated_pages(page, nr_pages); | |
1648 | } | |
c175eea4 | 1649 | |
e1b6aa6f | 1650 | return page_address(page); |
1da177e4 LT |
1651 | } |
1652 | ||
1653 | /* | |
1654 | * Interface to system's page release. | |
1655 | */ | |
343e0d7a | 1656 | static void kmem_freepages(struct kmem_cache *cachep, void *addr) |
1da177e4 | 1657 | { |
b28a02de | 1658 | unsigned long i = (1 << cachep->gfporder); |
1da177e4 LT |
1659 | struct page *page = virt_to_page(addr); |
1660 | const unsigned long nr_freed = i; | |
1661 | ||
b1eeab67 | 1662 | kmemcheck_free_shadow(page, cachep->gfporder); |
c175eea4 | 1663 | |
972d1a7b CL |
1664 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
1665 | sub_zone_page_state(page_zone(page), | |
1666 | NR_SLAB_RECLAIMABLE, nr_freed); | |
1667 | else | |
1668 | sub_zone_page_state(page_zone(page), | |
1669 | NR_SLAB_UNRECLAIMABLE, nr_freed); | |
1da177e4 | 1670 | while (i--) { |
f205b2fe NP |
1671 | BUG_ON(!PageSlab(page)); |
1672 | __ClearPageSlab(page); | |
1da177e4 LT |
1673 | page++; |
1674 | } | |
1da177e4 LT |
1675 | if (current->reclaim_state) |
1676 | current->reclaim_state->reclaimed_slab += nr_freed; | |
1677 | free_pages((unsigned long)addr, cachep->gfporder); | |
1da177e4 LT |
1678 | } |
1679 | ||
1680 | static void kmem_rcu_free(struct rcu_head *head) | |
1681 | { | |
b28a02de | 1682 | struct slab_rcu *slab_rcu = (struct slab_rcu *)head; |
343e0d7a | 1683 | struct kmem_cache *cachep = slab_rcu->cachep; |
1da177e4 LT |
1684 | |
1685 | kmem_freepages(cachep, slab_rcu->addr); | |
1686 | if (OFF_SLAB(cachep)) | |
1687 | kmem_cache_free(cachep->slabp_cache, slab_rcu); | |
1688 | } | |
1689 | ||
1690 | #if DEBUG | |
1691 | ||
1692 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
343e0d7a | 1693 | static void store_stackinfo(struct kmem_cache *cachep, unsigned long *addr, |
b28a02de | 1694 | unsigned long caller) |
1da177e4 | 1695 | { |
3dafccf2 | 1696 | int size = obj_size(cachep); |
1da177e4 | 1697 | |
3dafccf2 | 1698 | addr = (unsigned long *)&((char *)addr)[obj_offset(cachep)]; |
1da177e4 | 1699 | |
b28a02de | 1700 | if (size < 5 * sizeof(unsigned long)) |
1da177e4 LT |
1701 | return; |
1702 | ||
b28a02de PE |
1703 | *addr++ = 0x12345678; |
1704 | *addr++ = caller; | |
1705 | *addr++ = smp_processor_id(); | |
1706 | size -= 3 * sizeof(unsigned long); | |
1da177e4 LT |
1707 | { |
1708 | unsigned long *sptr = &caller; | |
1709 | unsigned long svalue; | |
1710 | ||
1711 | while (!kstack_end(sptr)) { | |
1712 | svalue = *sptr++; | |
1713 | if (kernel_text_address(svalue)) { | |
b28a02de | 1714 | *addr++ = svalue; |
1da177e4 LT |
1715 | size -= sizeof(unsigned long); |
1716 | if (size <= sizeof(unsigned long)) | |
1717 | break; | |
1718 | } | |
1719 | } | |
1720 | ||
1721 | } | |
b28a02de | 1722 | *addr++ = 0x87654321; |
1da177e4 LT |
1723 | } |
1724 | #endif | |
1725 | ||
343e0d7a | 1726 | static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val) |
1da177e4 | 1727 | { |
3dafccf2 MS |
1728 | int size = obj_size(cachep); |
1729 | addr = &((char *)addr)[obj_offset(cachep)]; | |
1da177e4 LT |
1730 | |
1731 | memset(addr, val, size); | |
b28a02de | 1732 | *(unsigned char *)(addr + size - 1) = POISON_END; |
1da177e4 LT |
1733 | } |
1734 | ||
1735 | static void dump_line(char *data, int offset, int limit) | |
1736 | { | |
1737 | int i; | |
aa83aa40 DJ |
1738 | unsigned char error = 0; |
1739 | int bad_count = 0; | |
1740 | ||
1da177e4 | 1741 | printk(KERN_ERR "%03x:", offset); |
aa83aa40 DJ |
1742 | for (i = 0; i < limit; i++) { |
1743 | if (data[offset + i] != POISON_FREE) { | |
1744 | error = data[offset + i]; | |
1745 | bad_count++; | |
1746 | } | |
b28a02de | 1747 | printk(" %02x", (unsigned char)data[offset + i]); |
aa83aa40 | 1748 | } |
1da177e4 | 1749 | printk("\n"); |
aa83aa40 DJ |
1750 | |
1751 | if (bad_count == 1) { | |
1752 | error ^= POISON_FREE; | |
1753 | if (!(error & (error - 1))) { | |
1754 | printk(KERN_ERR "Single bit error detected. Probably " | |
1755 | "bad RAM.\n"); | |
1756 | #ifdef CONFIG_X86 | |
1757 | printk(KERN_ERR "Run memtest86+ or a similar memory " | |
1758 | "test tool.\n"); | |
1759 | #else | |
1760 | printk(KERN_ERR "Run a memory test tool.\n"); | |
1761 | #endif | |
1762 | } | |
1763 | } | |
1da177e4 LT |
1764 | } |
1765 | #endif | |
1766 | ||
1767 | #if DEBUG | |
1768 | ||
343e0d7a | 1769 | static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines) |
1da177e4 LT |
1770 | { |
1771 | int i, size; | |
1772 | char *realobj; | |
1773 | ||
1774 | if (cachep->flags & SLAB_RED_ZONE) { | |
b46b8f19 | 1775 | printk(KERN_ERR "Redzone: 0x%llx/0x%llx.\n", |
a737b3e2 AM |
1776 | *dbg_redzone1(cachep, objp), |
1777 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
1778 | } |
1779 | ||
1780 | if (cachep->flags & SLAB_STORE_USER) { | |
1781 | printk(KERN_ERR "Last user: [<%p>]", | |
a737b3e2 | 1782 | *dbg_userword(cachep, objp)); |
1da177e4 | 1783 | print_symbol("(%s)", |
a737b3e2 | 1784 | (unsigned long)*dbg_userword(cachep, objp)); |
1da177e4 LT |
1785 | printk("\n"); |
1786 | } | |
3dafccf2 MS |
1787 | realobj = (char *)objp + obj_offset(cachep); |
1788 | size = obj_size(cachep); | |
b28a02de | 1789 | for (i = 0; i < size && lines; i += 16, lines--) { |
1da177e4 LT |
1790 | int limit; |
1791 | limit = 16; | |
b28a02de PE |
1792 | if (i + limit > size) |
1793 | limit = size - i; | |
1da177e4 LT |
1794 | dump_line(realobj, i, limit); |
1795 | } | |
1796 | } | |
1797 | ||
343e0d7a | 1798 | static void check_poison_obj(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
1799 | { |
1800 | char *realobj; | |
1801 | int size, i; | |
1802 | int lines = 0; | |
1803 | ||
3dafccf2 MS |
1804 | realobj = (char *)objp + obj_offset(cachep); |
1805 | size = obj_size(cachep); | |
1da177e4 | 1806 | |
b28a02de | 1807 | for (i = 0; i < size; i++) { |
1da177e4 | 1808 | char exp = POISON_FREE; |
b28a02de | 1809 | if (i == size - 1) |
1da177e4 LT |
1810 | exp = POISON_END; |
1811 | if (realobj[i] != exp) { | |
1812 | int limit; | |
1813 | /* Mismatch ! */ | |
1814 | /* Print header */ | |
1815 | if (lines == 0) { | |
b28a02de | 1816 | printk(KERN_ERR |
e94a40c5 DH |
1817 | "Slab corruption: %s start=%p, len=%d\n", |
1818 | cachep->name, realobj, size); | |
1da177e4 LT |
1819 | print_objinfo(cachep, objp, 0); |
1820 | } | |
1821 | /* Hexdump the affected line */ | |
b28a02de | 1822 | i = (i / 16) * 16; |
1da177e4 | 1823 | limit = 16; |
b28a02de PE |
1824 | if (i + limit > size) |
1825 | limit = size - i; | |
1da177e4 LT |
1826 | dump_line(realobj, i, limit); |
1827 | i += 16; | |
1828 | lines++; | |
1829 | /* Limit to 5 lines */ | |
1830 | if (lines > 5) | |
1831 | break; | |
1832 | } | |
1833 | } | |
1834 | if (lines != 0) { | |
1835 | /* Print some data about the neighboring objects, if they | |
1836 | * exist: | |
1837 | */ | |
6ed5eb22 | 1838 | struct slab *slabp = virt_to_slab(objp); |
8fea4e96 | 1839 | unsigned int objnr; |
1da177e4 | 1840 | |
8fea4e96 | 1841 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 | 1842 | if (objnr) { |
8fea4e96 | 1843 | objp = index_to_obj(cachep, slabp, objnr - 1); |
3dafccf2 | 1844 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 1845 | printk(KERN_ERR "Prev obj: start=%p, len=%d\n", |
b28a02de | 1846 | realobj, size); |
1da177e4 LT |
1847 | print_objinfo(cachep, objp, 2); |
1848 | } | |
b28a02de | 1849 | if (objnr + 1 < cachep->num) { |
8fea4e96 | 1850 | objp = index_to_obj(cachep, slabp, objnr + 1); |
3dafccf2 | 1851 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 1852 | printk(KERN_ERR "Next obj: start=%p, len=%d\n", |
b28a02de | 1853 | realobj, size); |
1da177e4 LT |
1854 | print_objinfo(cachep, objp, 2); |
1855 | } | |
1856 | } | |
1857 | } | |
1858 | #endif | |
1859 | ||
12dd36fa | 1860 | #if DEBUG |
e79aec29 | 1861 | static void slab_destroy_debugcheck(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 | 1862 | { |
1da177e4 LT |
1863 | int i; |
1864 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 1865 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
1866 | |
1867 | if (cachep->flags & SLAB_POISON) { | |
1868 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
a737b3e2 AM |
1869 | if (cachep->buffer_size % PAGE_SIZE == 0 && |
1870 | OFF_SLAB(cachep)) | |
b28a02de | 1871 | kernel_map_pages(virt_to_page(objp), |
a737b3e2 | 1872 | cachep->buffer_size / PAGE_SIZE, 1); |
1da177e4 LT |
1873 | else |
1874 | check_poison_obj(cachep, objp); | |
1875 | #else | |
1876 | check_poison_obj(cachep, objp); | |
1877 | #endif | |
1878 | } | |
1879 | if (cachep->flags & SLAB_RED_ZONE) { | |
1880 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) | |
1881 | slab_error(cachep, "start of a freed object " | |
b28a02de | 1882 | "was overwritten"); |
1da177e4 LT |
1883 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) |
1884 | slab_error(cachep, "end of a freed object " | |
b28a02de | 1885 | "was overwritten"); |
1da177e4 | 1886 | } |
1da177e4 | 1887 | } |
12dd36fa | 1888 | } |
1da177e4 | 1889 | #else |
e79aec29 | 1890 | static void slab_destroy_debugcheck(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa | 1891 | { |
12dd36fa | 1892 | } |
1da177e4 LT |
1893 | #endif |
1894 | ||
911851e6 RD |
1895 | /** |
1896 | * slab_destroy - destroy and release all objects in a slab | |
1897 | * @cachep: cache pointer being destroyed | |
1898 | * @slabp: slab pointer being destroyed | |
1899 | * | |
12dd36fa | 1900 | * Destroy all the objs in a slab, and release the mem back to the system. |
a737b3e2 AM |
1901 | * Before calling the slab must have been unlinked from the cache. The |
1902 | * cache-lock is not held/needed. | |
12dd36fa | 1903 | */ |
343e0d7a | 1904 | static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa MD |
1905 | { |
1906 | void *addr = slabp->s_mem - slabp->colouroff; | |
1907 | ||
e79aec29 | 1908 | slab_destroy_debugcheck(cachep, slabp); |
1da177e4 LT |
1909 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) { |
1910 | struct slab_rcu *slab_rcu; | |
1911 | ||
b28a02de | 1912 | slab_rcu = (struct slab_rcu *)slabp; |
1da177e4 LT |
1913 | slab_rcu->cachep = cachep; |
1914 | slab_rcu->addr = addr; | |
1915 | call_rcu(&slab_rcu->head, kmem_rcu_free); | |
1916 | } else { | |
1917 | kmem_freepages(cachep, addr); | |
873623df IM |
1918 | if (OFF_SLAB(cachep)) |
1919 | kmem_cache_free(cachep->slabp_cache, slabp); | |
1da177e4 LT |
1920 | } |
1921 | } | |
1922 | ||
117f6eb1 CL |
1923 | static void __kmem_cache_destroy(struct kmem_cache *cachep) |
1924 | { | |
1925 | int i; | |
1926 | struct kmem_list3 *l3; | |
1927 | ||
1928 | for_each_online_cpu(i) | |
1929 | kfree(cachep->array[i]); | |
1930 | ||
1931 | /* NUMA: free the list3 structures */ | |
1932 | for_each_online_node(i) { | |
1933 | l3 = cachep->nodelists[i]; | |
1934 | if (l3) { | |
1935 | kfree(l3->shared); | |
1936 | free_alien_cache(l3->alien); | |
1937 | kfree(l3); | |
1938 | } | |
1939 | } | |
1940 | kmem_cache_free(&cache_cache, cachep); | |
1941 | } | |
1942 | ||
1943 | ||
4d268eba | 1944 | /** |
a70773dd RD |
1945 | * calculate_slab_order - calculate size (page order) of slabs |
1946 | * @cachep: pointer to the cache that is being created | |
1947 | * @size: size of objects to be created in this cache. | |
1948 | * @align: required alignment for the objects. | |
1949 | * @flags: slab allocation flags | |
1950 | * | |
1951 | * Also calculates the number of objects per slab. | |
4d268eba PE |
1952 | * |
1953 | * This could be made much more intelligent. For now, try to avoid using | |
1954 | * high order pages for slabs. When the gfp() functions are more friendly | |
1955 | * towards high-order requests, this should be changed. | |
1956 | */ | |
a737b3e2 | 1957 | static size_t calculate_slab_order(struct kmem_cache *cachep, |
ee13d785 | 1958 | size_t size, size_t align, unsigned long flags) |
4d268eba | 1959 | { |
b1ab41c4 | 1960 | unsigned long offslab_limit; |
4d268eba | 1961 | size_t left_over = 0; |
9888e6fa | 1962 | int gfporder; |
4d268eba | 1963 | |
0aa817f0 | 1964 | for (gfporder = 0; gfporder <= KMALLOC_MAX_ORDER; gfporder++) { |
4d268eba PE |
1965 | unsigned int num; |
1966 | size_t remainder; | |
1967 | ||
9888e6fa | 1968 | cache_estimate(gfporder, size, align, flags, &remainder, &num); |
4d268eba PE |
1969 | if (!num) |
1970 | continue; | |
9888e6fa | 1971 | |
b1ab41c4 IM |
1972 | if (flags & CFLGS_OFF_SLAB) { |
1973 | /* | |
1974 | * Max number of objs-per-slab for caches which | |
1975 | * use off-slab slabs. Needed to avoid a possible | |
1976 | * looping condition in cache_grow(). | |
1977 | */ | |
1978 | offslab_limit = size - sizeof(struct slab); | |
1979 | offslab_limit /= sizeof(kmem_bufctl_t); | |
1980 | ||
1981 | if (num > offslab_limit) | |
1982 | break; | |
1983 | } | |
4d268eba | 1984 | |
9888e6fa | 1985 | /* Found something acceptable - save it away */ |
4d268eba | 1986 | cachep->num = num; |
9888e6fa | 1987 | cachep->gfporder = gfporder; |
4d268eba PE |
1988 | left_over = remainder; |
1989 | ||
f78bb8ad LT |
1990 | /* |
1991 | * A VFS-reclaimable slab tends to have most allocations | |
1992 | * as GFP_NOFS and we really don't want to have to be allocating | |
1993 | * higher-order pages when we are unable to shrink dcache. | |
1994 | */ | |
1995 | if (flags & SLAB_RECLAIM_ACCOUNT) | |
1996 | break; | |
1997 | ||
4d268eba PE |
1998 | /* |
1999 | * Large number of objects is good, but very large slabs are | |
2000 | * currently bad for the gfp()s. | |
2001 | */ | |
9888e6fa | 2002 | if (gfporder >= slab_break_gfp_order) |
4d268eba PE |
2003 | break; |
2004 | ||
9888e6fa LT |
2005 | /* |
2006 | * Acceptable internal fragmentation? | |
2007 | */ | |
a737b3e2 | 2008 | if (left_over * 8 <= (PAGE_SIZE << gfporder)) |
4d268eba PE |
2009 | break; |
2010 | } | |
2011 | return left_over; | |
2012 | } | |
2013 | ||
83b519e8 | 2014 | static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) |
f30cf7d1 | 2015 | { |
2ed3a4ef | 2016 | if (g_cpucache_up == FULL) |
83b519e8 | 2017 | return enable_cpucache(cachep, gfp); |
2ed3a4ef | 2018 | |
f30cf7d1 PE |
2019 | if (g_cpucache_up == NONE) { |
2020 | /* | |
2021 | * Note: the first kmem_cache_create must create the cache | |
2022 | * that's used by kmalloc(24), otherwise the creation of | |
2023 | * further caches will BUG(). | |
2024 | */ | |
2025 | cachep->array[smp_processor_id()] = &initarray_generic.cache; | |
2026 | ||
2027 | /* | |
2028 | * If the cache that's used by kmalloc(sizeof(kmem_list3)) is | |
2029 | * the first cache, then we need to set up all its list3s, | |
2030 | * otherwise the creation of further caches will BUG(). | |
2031 | */ | |
2032 | set_up_list3s(cachep, SIZE_AC); | |
2033 | if (INDEX_AC == INDEX_L3) | |
2034 | g_cpucache_up = PARTIAL_L3; | |
2035 | else | |
2036 | g_cpucache_up = PARTIAL_AC; | |
2037 | } else { | |
2038 | cachep->array[smp_processor_id()] = | |
83b519e8 | 2039 | kmalloc(sizeof(struct arraycache_init), gfp); |
f30cf7d1 PE |
2040 | |
2041 | if (g_cpucache_up == PARTIAL_AC) { | |
2042 | set_up_list3s(cachep, SIZE_L3); | |
2043 | g_cpucache_up = PARTIAL_L3; | |
2044 | } else { | |
2045 | int node; | |
556a169d | 2046 | for_each_online_node(node) { |
f30cf7d1 PE |
2047 | cachep->nodelists[node] = |
2048 | kmalloc_node(sizeof(struct kmem_list3), | |
eb91f1d0 | 2049 | gfp, node); |
f30cf7d1 PE |
2050 | BUG_ON(!cachep->nodelists[node]); |
2051 | kmem_list3_init(cachep->nodelists[node]); | |
2052 | } | |
2053 | } | |
2054 | } | |
2055 | cachep->nodelists[numa_node_id()]->next_reap = | |
2056 | jiffies + REAPTIMEOUT_LIST3 + | |
2057 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
2058 | ||
2059 | cpu_cache_get(cachep)->avail = 0; | |
2060 | cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; | |
2061 | cpu_cache_get(cachep)->batchcount = 1; | |
2062 | cpu_cache_get(cachep)->touched = 0; | |
2063 | cachep->batchcount = 1; | |
2064 | cachep->limit = BOOT_CPUCACHE_ENTRIES; | |
2ed3a4ef | 2065 | return 0; |
f30cf7d1 PE |
2066 | } |
2067 | ||
1da177e4 LT |
2068 | /** |
2069 | * kmem_cache_create - Create a cache. | |
2070 | * @name: A string which is used in /proc/slabinfo to identify this cache. | |
2071 | * @size: The size of objects to be created in this cache. | |
2072 | * @align: The required alignment for the objects. | |
2073 | * @flags: SLAB flags | |
2074 | * @ctor: A constructor for the objects. | |
1da177e4 LT |
2075 | * |
2076 | * Returns a ptr to the cache on success, NULL on failure. | |
2077 | * Cannot be called within a int, but can be interrupted. | |
20c2df83 | 2078 | * The @ctor is run when new pages are allocated by the cache. |
1da177e4 LT |
2079 | * |
2080 | * @name must be valid until the cache is destroyed. This implies that | |
a737b3e2 | 2081 | * the module calling this has to destroy the cache before getting unloaded. |
249da166 CM |
2082 | * Note that kmem_cache_name() is not guaranteed to return the same pointer, |
2083 | * therefore applications must manage it themselves. | |
a737b3e2 | 2084 | * |
1da177e4 LT |
2085 | * The flags are |
2086 | * | |
2087 | * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) | |
2088 | * to catch references to uninitialised memory. | |
2089 | * | |
2090 | * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check | |
2091 | * for buffer overruns. | |
2092 | * | |
1da177e4 LT |
2093 | * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware |
2094 | * cacheline. This can be beneficial if you're counting cycles as closely | |
2095 | * as davem. | |
2096 | */ | |
343e0d7a | 2097 | struct kmem_cache * |
1da177e4 | 2098 | kmem_cache_create (const char *name, size_t size, size_t align, |
51cc5068 | 2099 | unsigned long flags, void (*ctor)(void *)) |
1da177e4 LT |
2100 | { |
2101 | size_t left_over, slab_size, ralign; | |
7a7c381d | 2102 | struct kmem_cache *cachep = NULL, *pc; |
83b519e8 | 2103 | gfp_t gfp; |
1da177e4 LT |
2104 | |
2105 | /* | |
2106 | * Sanity checks... these are all serious usage bugs. | |
2107 | */ | |
a737b3e2 | 2108 | if (!name || in_interrupt() || (size < BYTES_PER_WORD) || |
20c2df83 | 2109 | size > KMALLOC_MAX_SIZE) { |
d40cee24 | 2110 | printk(KERN_ERR "%s: Early error in slab %s\n", __func__, |
a737b3e2 | 2111 | name); |
b28a02de PE |
2112 | BUG(); |
2113 | } | |
1da177e4 | 2114 | |
f0188f47 | 2115 | /* |
8f5be20b | 2116 | * We use cache_chain_mutex to ensure a consistent view of |
174596a0 | 2117 | * cpu_online_mask as well. Please see cpuup_callback |
f0188f47 | 2118 | */ |
83b519e8 PE |
2119 | if (slab_is_available()) { |
2120 | get_online_cpus(); | |
2121 | mutex_lock(&cache_chain_mutex); | |
2122 | } | |
4f12bb4f | 2123 | |
7a7c381d | 2124 | list_for_each_entry(pc, &cache_chain, next) { |
4f12bb4f AM |
2125 | char tmp; |
2126 | int res; | |
2127 | ||
2128 | /* | |
2129 | * This happens when the module gets unloaded and doesn't | |
2130 | * destroy its slab cache and no-one else reuses the vmalloc | |
2131 | * area of the module. Print a warning. | |
2132 | */ | |
138ae663 | 2133 | res = probe_kernel_address(pc->name, tmp); |
4f12bb4f | 2134 | if (res) { |
b4169525 | 2135 | printk(KERN_ERR |
2136 | "SLAB: cache with size %d has lost its name\n", | |
3dafccf2 | 2137 | pc->buffer_size); |
4f12bb4f AM |
2138 | continue; |
2139 | } | |
2140 | ||
b28a02de | 2141 | if (!strcmp(pc->name, name)) { |
b4169525 | 2142 | printk(KERN_ERR |
2143 | "kmem_cache_create: duplicate cache %s\n", name); | |
4f12bb4f AM |
2144 | dump_stack(); |
2145 | goto oops; | |
2146 | } | |
2147 | } | |
2148 | ||
1da177e4 LT |
2149 | #if DEBUG |
2150 | WARN_ON(strchr(name, ' ')); /* It confuses parsers */ | |
1da177e4 LT |
2151 | #if FORCED_DEBUG |
2152 | /* | |
2153 | * Enable redzoning and last user accounting, except for caches with | |
2154 | * large objects, if the increased size would increase the object size | |
2155 | * above the next power of two: caches with object sizes just above a | |
2156 | * power of two have a significant amount of internal fragmentation. | |
2157 | */ | |
87a927c7 DW |
2158 | if (size < 4096 || fls(size - 1) == fls(size-1 + REDZONE_ALIGN + |
2159 | 2 * sizeof(unsigned long long))) | |
b28a02de | 2160 | flags |= SLAB_RED_ZONE | SLAB_STORE_USER; |
1da177e4 LT |
2161 | if (!(flags & SLAB_DESTROY_BY_RCU)) |
2162 | flags |= SLAB_POISON; | |
2163 | #endif | |
2164 | if (flags & SLAB_DESTROY_BY_RCU) | |
2165 | BUG_ON(flags & SLAB_POISON); | |
2166 | #endif | |
1da177e4 | 2167 | /* |
a737b3e2 AM |
2168 | * Always checks flags, a caller might be expecting debug support which |
2169 | * isn't available. | |
1da177e4 | 2170 | */ |
40094fa6 | 2171 | BUG_ON(flags & ~CREATE_MASK); |
1da177e4 | 2172 | |
a737b3e2 AM |
2173 | /* |
2174 | * Check that size is in terms of words. This is needed to avoid | |
1da177e4 LT |
2175 | * unaligned accesses for some archs when redzoning is used, and makes |
2176 | * sure any on-slab bufctl's are also correctly aligned. | |
2177 | */ | |
b28a02de PE |
2178 | if (size & (BYTES_PER_WORD - 1)) { |
2179 | size += (BYTES_PER_WORD - 1); | |
2180 | size &= ~(BYTES_PER_WORD - 1); | |
1da177e4 LT |
2181 | } |
2182 | ||
a737b3e2 AM |
2183 | /* calculate the final buffer alignment: */ |
2184 | ||
1da177e4 LT |
2185 | /* 1) arch recommendation: can be overridden for debug */ |
2186 | if (flags & SLAB_HWCACHE_ALIGN) { | |
a737b3e2 AM |
2187 | /* |
2188 | * Default alignment: as specified by the arch code. Except if | |
2189 | * an object is really small, then squeeze multiple objects into | |
2190 | * one cacheline. | |
1da177e4 LT |
2191 | */ |
2192 | ralign = cache_line_size(); | |
b28a02de | 2193 | while (size <= ralign / 2) |
1da177e4 LT |
2194 | ralign /= 2; |
2195 | } else { | |
2196 | ralign = BYTES_PER_WORD; | |
2197 | } | |
ca5f9703 PE |
2198 | |
2199 | /* | |
87a927c7 DW |
2200 | * Redzoning and user store require word alignment or possibly larger. |
2201 | * Note this will be overridden by architecture or caller mandated | |
2202 | * alignment if either is greater than BYTES_PER_WORD. | |
ca5f9703 | 2203 | */ |
87a927c7 DW |
2204 | if (flags & SLAB_STORE_USER) |
2205 | ralign = BYTES_PER_WORD; | |
2206 | ||
2207 | if (flags & SLAB_RED_ZONE) { | |
2208 | ralign = REDZONE_ALIGN; | |
2209 | /* If redzoning, ensure that the second redzone is suitably | |
2210 | * aligned, by adjusting the object size accordingly. */ | |
2211 | size += REDZONE_ALIGN - 1; | |
2212 | size &= ~(REDZONE_ALIGN - 1); | |
2213 | } | |
ca5f9703 | 2214 | |
a44b56d3 | 2215 | /* 2) arch mandated alignment */ |
1da177e4 LT |
2216 | if (ralign < ARCH_SLAB_MINALIGN) { |
2217 | ralign = ARCH_SLAB_MINALIGN; | |
1da177e4 | 2218 | } |
a44b56d3 | 2219 | /* 3) caller mandated alignment */ |
1da177e4 LT |
2220 | if (ralign < align) { |
2221 | ralign = align; | |
1da177e4 | 2222 | } |
a44b56d3 | 2223 | /* disable debug if necessary */ |
b46b8f19 | 2224 | if (ralign > __alignof__(unsigned long long)) |
a44b56d3 | 2225 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); |
a737b3e2 | 2226 | /* |
ca5f9703 | 2227 | * 4) Store it. |
1da177e4 LT |
2228 | */ |
2229 | align = ralign; | |
2230 | ||
83b519e8 PE |
2231 | if (slab_is_available()) |
2232 | gfp = GFP_KERNEL; | |
2233 | else | |
2234 | gfp = GFP_NOWAIT; | |
2235 | ||
1da177e4 | 2236 | /* Get cache's description obj. */ |
83b519e8 | 2237 | cachep = kmem_cache_zalloc(&cache_cache, gfp); |
1da177e4 | 2238 | if (!cachep) |
4f12bb4f | 2239 | goto oops; |
1da177e4 LT |
2240 | |
2241 | #if DEBUG | |
3dafccf2 | 2242 | cachep->obj_size = size; |
1da177e4 | 2243 | |
ca5f9703 PE |
2244 | /* |
2245 | * Both debugging options require word-alignment which is calculated | |
2246 | * into align above. | |
2247 | */ | |
1da177e4 | 2248 | if (flags & SLAB_RED_ZONE) { |
1da177e4 | 2249 | /* add space for red zone words */ |
b46b8f19 DW |
2250 | cachep->obj_offset += sizeof(unsigned long long); |
2251 | size += 2 * sizeof(unsigned long long); | |
1da177e4 LT |
2252 | } |
2253 | if (flags & SLAB_STORE_USER) { | |
ca5f9703 | 2254 | /* user store requires one word storage behind the end of |
87a927c7 DW |
2255 | * the real object. But if the second red zone needs to be |
2256 | * aligned to 64 bits, we must allow that much space. | |
1da177e4 | 2257 | */ |
87a927c7 DW |
2258 | if (flags & SLAB_RED_ZONE) |
2259 | size += REDZONE_ALIGN; | |
2260 | else | |
2261 | size += BYTES_PER_WORD; | |
1da177e4 LT |
2262 | } |
2263 | #if FORCED_DEBUG && defined(CONFIG_DEBUG_PAGEALLOC) | |
b28a02de | 2264 | if (size >= malloc_sizes[INDEX_L3 + 1].cs_size |
3dafccf2 MS |
2265 | && cachep->obj_size > cache_line_size() && size < PAGE_SIZE) { |
2266 | cachep->obj_offset += PAGE_SIZE - size; | |
1da177e4 LT |
2267 | size = PAGE_SIZE; |
2268 | } | |
2269 | #endif | |
2270 | #endif | |
2271 | ||
e0a42726 IM |
2272 | /* |
2273 | * Determine if the slab management is 'on' or 'off' slab. | |
2274 | * (bootstrapping cannot cope with offslab caches so don't do | |
e7cb55b9 CM |
2275 | * it too early on. Always use on-slab management when |
2276 | * SLAB_NOLEAKTRACE to avoid recursive calls into kmemleak) | |
e0a42726 | 2277 | */ |
e7cb55b9 CM |
2278 | if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init && |
2279 | !(flags & SLAB_NOLEAKTRACE)) | |
1da177e4 LT |
2280 | /* |
2281 | * Size is large, assume best to place the slab management obj | |
2282 | * off-slab (should allow better packing of objs). | |
2283 | */ | |
2284 | flags |= CFLGS_OFF_SLAB; | |
2285 | ||
2286 | size = ALIGN(size, align); | |
2287 | ||
f78bb8ad | 2288 | left_over = calculate_slab_order(cachep, size, align, flags); |
1da177e4 LT |
2289 | |
2290 | if (!cachep->num) { | |
b4169525 | 2291 | printk(KERN_ERR |
2292 | "kmem_cache_create: couldn't create cache %s.\n", name); | |
1da177e4 LT |
2293 | kmem_cache_free(&cache_cache, cachep); |
2294 | cachep = NULL; | |
4f12bb4f | 2295 | goto oops; |
1da177e4 | 2296 | } |
b28a02de PE |
2297 | slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) |
2298 | + sizeof(struct slab), align); | |
1da177e4 LT |
2299 | |
2300 | /* | |
2301 | * If the slab has been placed off-slab, and we have enough space then | |
2302 | * move it on-slab. This is at the expense of any extra colouring. | |
2303 | */ | |
2304 | if (flags & CFLGS_OFF_SLAB && left_over >= slab_size) { | |
2305 | flags &= ~CFLGS_OFF_SLAB; | |
2306 | left_over -= slab_size; | |
2307 | } | |
2308 | ||
2309 | if (flags & CFLGS_OFF_SLAB) { | |
2310 | /* really off slab. No need for manual alignment */ | |
b28a02de PE |
2311 | slab_size = |
2312 | cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab); | |
67461365 RL |
2313 | |
2314 | #ifdef CONFIG_PAGE_POISONING | |
2315 | /* If we're going to use the generic kernel_map_pages() | |
2316 | * poisoning, then it's going to smash the contents of | |
2317 | * the redzone and userword anyhow, so switch them off. | |
2318 | */ | |
2319 | if (size % PAGE_SIZE == 0 && flags & SLAB_POISON) | |
2320 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); | |
2321 | #endif | |
1da177e4 LT |
2322 | } |
2323 | ||
2324 | cachep->colour_off = cache_line_size(); | |
2325 | /* Offset must be a multiple of the alignment. */ | |
2326 | if (cachep->colour_off < align) | |
2327 | cachep->colour_off = align; | |
b28a02de | 2328 | cachep->colour = left_over / cachep->colour_off; |
1da177e4 LT |
2329 | cachep->slab_size = slab_size; |
2330 | cachep->flags = flags; | |
2331 | cachep->gfpflags = 0; | |
4b51d669 | 2332 | if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA)) |
1da177e4 | 2333 | cachep->gfpflags |= GFP_DMA; |
3dafccf2 | 2334 | cachep->buffer_size = size; |
6a2d7a95 | 2335 | cachep->reciprocal_buffer_size = reciprocal_value(size); |
1da177e4 | 2336 | |
e5ac9c5a | 2337 | if (flags & CFLGS_OFF_SLAB) { |
b2d55073 | 2338 | cachep->slabp_cache = kmem_find_general_cachep(slab_size, 0u); |
e5ac9c5a RT |
2339 | /* |
2340 | * This is a possibility for one of the malloc_sizes caches. | |
2341 | * But since we go off slab only for object size greater than | |
2342 | * PAGE_SIZE/8, and malloc_sizes gets created in ascending order, | |
2343 | * this should not happen at all. | |
2344 | * But leave a BUG_ON for some lucky dude. | |
2345 | */ | |
6cb8f913 | 2346 | BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache)); |
e5ac9c5a | 2347 | } |
1da177e4 | 2348 | cachep->ctor = ctor; |
1da177e4 LT |
2349 | cachep->name = name; |
2350 | ||
83b519e8 | 2351 | if (setup_cpu_cache(cachep, gfp)) { |
2ed3a4ef CL |
2352 | __kmem_cache_destroy(cachep); |
2353 | cachep = NULL; | |
2354 | goto oops; | |
2355 | } | |
1da177e4 | 2356 | |
1da177e4 LT |
2357 | /* cache setup completed, link it into the list */ |
2358 | list_add(&cachep->next, &cache_chain); | |
a737b3e2 | 2359 | oops: |
1da177e4 LT |
2360 | if (!cachep && (flags & SLAB_PANIC)) |
2361 | panic("kmem_cache_create(): failed to create slab `%s'\n", | |
b28a02de | 2362 | name); |
83b519e8 PE |
2363 | if (slab_is_available()) { |
2364 | mutex_unlock(&cache_chain_mutex); | |
2365 | put_online_cpus(); | |
2366 | } | |
1da177e4 LT |
2367 | return cachep; |
2368 | } | |
2369 | EXPORT_SYMBOL(kmem_cache_create); | |
2370 | ||
2371 | #if DEBUG | |
2372 | static void check_irq_off(void) | |
2373 | { | |
2374 | BUG_ON(!irqs_disabled()); | |
2375 | } | |
2376 | ||
2377 | static void check_irq_on(void) | |
2378 | { | |
2379 | BUG_ON(irqs_disabled()); | |
2380 | } | |
2381 | ||
343e0d7a | 2382 | static void check_spinlock_acquired(struct kmem_cache *cachep) |
1da177e4 LT |
2383 | { |
2384 | #ifdef CONFIG_SMP | |
2385 | check_irq_off(); | |
e498be7d | 2386 | assert_spin_locked(&cachep->nodelists[numa_node_id()]->list_lock); |
1da177e4 LT |
2387 | #endif |
2388 | } | |
e498be7d | 2389 | |
343e0d7a | 2390 | static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node) |
e498be7d CL |
2391 | { |
2392 | #ifdef CONFIG_SMP | |
2393 | check_irq_off(); | |
2394 | assert_spin_locked(&cachep->nodelists[node]->list_lock); | |
2395 | #endif | |
2396 | } | |
2397 | ||
1da177e4 LT |
2398 | #else |
2399 | #define check_irq_off() do { } while(0) | |
2400 | #define check_irq_on() do { } while(0) | |
2401 | #define check_spinlock_acquired(x) do { } while(0) | |
e498be7d | 2402 | #define check_spinlock_acquired_node(x, y) do { } while(0) |
1da177e4 LT |
2403 | #endif |
2404 | ||
aab2207c CL |
2405 | static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, |
2406 | struct array_cache *ac, | |
2407 | int force, int node); | |
2408 | ||
1da177e4 LT |
2409 | static void do_drain(void *arg) |
2410 | { | |
a737b3e2 | 2411 | struct kmem_cache *cachep = arg; |
1da177e4 | 2412 | struct array_cache *ac; |
ff69416e | 2413 | int node = numa_node_id(); |
1da177e4 LT |
2414 | |
2415 | check_irq_off(); | |
9a2dba4b | 2416 | ac = cpu_cache_get(cachep); |
ff69416e CL |
2417 | spin_lock(&cachep->nodelists[node]->list_lock); |
2418 | free_block(cachep, ac->entry, ac->avail, node); | |
2419 | spin_unlock(&cachep->nodelists[node]->list_lock); | |
1da177e4 LT |
2420 | ac->avail = 0; |
2421 | } | |
2422 | ||
343e0d7a | 2423 | static void drain_cpu_caches(struct kmem_cache *cachep) |
1da177e4 | 2424 | { |
e498be7d CL |
2425 | struct kmem_list3 *l3; |
2426 | int node; | |
2427 | ||
15c8b6c1 | 2428 | on_each_cpu(do_drain, cachep, 1); |
1da177e4 | 2429 | check_irq_on(); |
b28a02de | 2430 | for_each_online_node(node) { |
e498be7d | 2431 | l3 = cachep->nodelists[node]; |
a4523a8b RD |
2432 | if (l3 && l3->alien) |
2433 | drain_alien_cache(cachep, l3->alien); | |
2434 | } | |
2435 | ||
2436 | for_each_online_node(node) { | |
2437 | l3 = cachep->nodelists[node]; | |
2438 | if (l3) | |
aab2207c | 2439 | drain_array(cachep, l3, l3->shared, 1, node); |
e498be7d | 2440 | } |
1da177e4 LT |
2441 | } |
2442 | ||
ed11d9eb CL |
2443 | /* |
2444 | * Remove slabs from the list of free slabs. | |
2445 | * Specify the number of slabs to drain in tofree. | |
2446 | * | |
2447 | * Returns the actual number of slabs released. | |
2448 | */ | |
2449 | static int drain_freelist(struct kmem_cache *cache, | |
2450 | struct kmem_list3 *l3, int tofree) | |
1da177e4 | 2451 | { |
ed11d9eb CL |
2452 | struct list_head *p; |
2453 | int nr_freed; | |
1da177e4 | 2454 | struct slab *slabp; |
1da177e4 | 2455 | |
ed11d9eb CL |
2456 | nr_freed = 0; |
2457 | while (nr_freed < tofree && !list_empty(&l3->slabs_free)) { | |
1da177e4 | 2458 | |
ed11d9eb | 2459 | spin_lock_irq(&l3->list_lock); |
e498be7d | 2460 | p = l3->slabs_free.prev; |
ed11d9eb CL |
2461 | if (p == &l3->slabs_free) { |
2462 | spin_unlock_irq(&l3->list_lock); | |
2463 | goto out; | |
2464 | } | |
1da177e4 | 2465 | |
ed11d9eb | 2466 | slabp = list_entry(p, struct slab, list); |
1da177e4 | 2467 | #if DEBUG |
40094fa6 | 2468 | BUG_ON(slabp->inuse); |
1da177e4 LT |
2469 | #endif |
2470 | list_del(&slabp->list); | |
ed11d9eb CL |
2471 | /* |
2472 | * Safe to drop the lock. The slab is no longer linked | |
2473 | * to the cache. | |
2474 | */ | |
2475 | l3->free_objects -= cache->num; | |
e498be7d | 2476 | spin_unlock_irq(&l3->list_lock); |
ed11d9eb CL |
2477 | slab_destroy(cache, slabp); |
2478 | nr_freed++; | |
1da177e4 | 2479 | } |
ed11d9eb CL |
2480 | out: |
2481 | return nr_freed; | |
1da177e4 LT |
2482 | } |
2483 | ||
8f5be20b | 2484 | /* Called with cache_chain_mutex held to protect against cpu hotplug */ |
343e0d7a | 2485 | static int __cache_shrink(struct kmem_cache *cachep) |
e498be7d CL |
2486 | { |
2487 | int ret = 0, i = 0; | |
2488 | struct kmem_list3 *l3; | |
2489 | ||
2490 | drain_cpu_caches(cachep); | |
2491 | ||
2492 | check_irq_on(); | |
2493 | for_each_online_node(i) { | |
2494 | l3 = cachep->nodelists[i]; | |
ed11d9eb CL |
2495 | if (!l3) |
2496 | continue; | |
2497 | ||
2498 | drain_freelist(cachep, l3, l3->free_objects); | |
2499 | ||
2500 | ret += !list_empty(&l3->slabs_full) || | |
2501 | !list_empty(&l3->slabs_partial); | |
e498be7d CL |
2502 | } |
2503 | return (ret ? 1 : 0); | |
2504 | } | |
2505 | ||
1da177e4 LT |
2506 | /** |
2507 | * kmem_cache_shrink - Shrink a cache. | |
2508 | * @cachep: The cache to shrink. | |
2509 | * | |
2510 | * Releases as many slabs as possible for a cache. | |
2511 | * To help debugging, a zero exit status indicates all slabs were released. | |
2512 | */ | |
343e0d7a | 2513 | int kmem_cache_shrink(struct kmem_cache *cachep) |
1da177e4 | 2514 | { |
8f5be20b | 2515 | int ret; |
40094fa6 | 2516 | BUG_ON(!cachep || in_interrupt()); |
1da177e4 | 2517 | |
95402b38 | 2518 | get_online_cpus(); |
8f5be20b RT |
2519 | mutex_lock(&cache_chain_mutex); |
2520 | ret = __cache_shrink(cachep); | |
2521 | mutex_unlock(&cache_chain_mutex); | |
95402b38 | 2522 | put_online_cpus(); |
8f5be20b | 2523 | return ret; |
1da177e4 LT |
2524 | } |
2525 | EXPORT_SYMBOL(kmem_cache_shrink); | |
2526 | ||
2527 | /** | |
2528 | * kmem_cache_destroy - delete a cache | |
2529 | * @cachep: the cache to destroy | |
2530 | * | |
72fd4a35 | 2531 | * Remove a &struct kmem_cache object from the slab cache. |
1da177e4 LT |
2532 | * |
2533 | * It is expected this function will be called by a module when it is | |
2534 | * unloaded. This will remove the cache completely, and avoid a duplicate | |
2535 | * cache being allocated each time a module is loaded and unloaded, if the | |
2536 | * module doesn't have persistent in-kernel storage across loads and unloads. | |
2537 | * | |
2538 | * The cache must be empty before calling this function. | |
2539 | * | |
2540 | * The caller must guarantee that noone will allocate memory from the cache | |
2541 | * during the kmem_cache_destroy(). | |
2542 | */ | |
133d205a | 2543 | void kmem_cache_destroy(struct kmem_cache *cachep) |
1da177e4 | 2544 | { |
40094fa6 | 2545 | BUG_ON(!cachep || in_interrupt()); |
1da177e4 | 2546 | |
1da177e4 | 2547 | /* Find the cache in the chain of caches. */ |
95402b38 | 2548 | get_online_cpus(); |
fc0abb14 | 2549 | mutex_lock(&cache_chain_mutex); |
1da177e4 LT |
2550 | /* |
2551 | * the chain is never empty, cache_cache is never destroyed | |
2552 | */ | |
2553 | list_del(&cachep->next); | |
1da177e4 LT |
2554 | if (__cache_shrink(cachep)) { |
2555 | slab_error(cachep, "Can't free all objects"); | |
b28a02de | 2556 | list_add(&cachep->next, &cache_chain); |
fc0abb14 | 2557 | mutex_unlock(&cache_chain_mutex); |
95402b38 | 2558 | put_online_cpus(); |
133d205a | 2559 | return; |
1da177e4 LT |
2560 | } |
2561 | ||
2562 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) | |
7ed9f7e5 | 2563 | rcu_barrier(); |
1da177e4 | 2564 | |
117f6eb1 | 2565 | __kmem_cache_destroy(cachep); |
8f5be20b | 2566 | mutex_unlock(&cache_chain_mutex); |
95402b38 | 2567 | put_online_cpus(); |
1da177e4 LT |
2568 | } |
2569 | EXPORT_SYMBOL(kmem_cache_destroy); | |
2570 | ||
e5ac9c5a RT |
2571 | /* |
2572 | * Get the memory for a slab management obj. | |
2573 | * For a slab cache when the slab descriptor is off-slab, slab descriptors | |
2574 | * always come from malloc_sizes caches. The slab descriptor cannot | |
2575 | * come from the same cache which is getting created because, | |
2576 | * when we are searching for an appropriate cache for these | |
2577 | * descriptors in kmem_cache_create, we search through the malloc_sizes array. | |
2578 | * If we are creating a malloc_sizes cache here it would not be visible to | |
2579 | * kmem_find_general_cachep till the initialization is complete. | |
2580 | * Hence we cannot have slabp_cache same as the original cache. | |
2581 | */ | |
343e0d7a | 2582 | static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp, |
5b74ada7 RT |
2583 | int colour_off, gfp_t local_flags, |
2584 | int nodeid) | |
1da177e4 LT |
2585 | { |
2586 | struct slab *slabp; | |
b28a02de | 2587 | |
1da177e4 LT |
2588 | if (OFF_SLAB(cachep)) { |
2589 | /* Slab management obj is off-slab. */ | |
5b74ada7 | 2590 | slabp = kmem_cache_alloc_node(cachep->slabp_cache, |
8759ec50 | 2591 | local_flags, nodeid); |
d5cff635 CM |
2592 | /* |
2593 | * If the first object in the slab is leaked (it's allocated | |
2594 | * but no one has a reference to it), we want to make sure | |
2595 | * kmemleak does not treat the ->s_mem pointer as a reference | |
2596 | * to the object. Otherwise we will not report the leak. | |
2597 | */ | |
c017b4be CM |
2598 | kmemleak_scan_area(&slabp->list, sizeof(struct list_head), |
2599 | local_flags); | |
1da177e4 LT |
2600 | if (!slabp) |
2601 | return NULL; | |
2602 | } else { | |
b28a02de | 2603 | slabp = objp + colour_off; |
1da177e4 LT |
2604 | colour_off += cachep->slab_size; |
2605 | } | |
2606 | slabp->inuse = 0; | |
2607 | slabp->colouroff = colour_off; | |
b28a02de | 2608 | slabp->s_mem = objp + colour_off; |
5b74ada7 | 2609 | slabp->nodeid = nodeid; |
e51bfd0a | 2610 | slabp->free = 0; |
1da177e4 LT |
2611 | return slabp; |
2612 | } | |
2613 | ||
2614 | static inline kmem_bufctl_t *slab_bufctl(struct slab *slabp) | |
2615 | { | |
b28a02de | 2616 | return (kmem_bufctl_t *) (slabp + 1); |
1da177e4 LT |
2617 | } |
2618 | ||
343e0d7a | 2619 | static void cache_init_objs(struct kmem_cache *cachep, |
a35afb83 | 2620 | struct slab *slabp) |
1da177e4 LT |
2621 | { |
2622 | int i; | |
2623 | ||
2624 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 2625 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
2626 | #if DEBUG |
2627 | /* need to poison the objs? */ | |
2628 | if (cachep->flags & SLAB_POISON) | |
2629 | poison_obj(cachep, objp, POISON_FREE); | |
2630 | if (cachep->flags & SLAB_STORE_USER) | |
2631 | *dbg_userword(cachep, objp) = NULL; | |
2632 | ||
2633 | if (cachep->flags & SLAB_RED_ZONE) { | |
2634 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; | |
2635 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
2636 | } | |
2637 | /* | |
a737b3e2 AM |
2638 | * Constructors are not allowed to allocate memory from the same |
2639 | * cache which they are a constructor for. Otherwise, deadlock. | |
2640 | * They must also be threaded. | |
1da177e4 LT |
2641 | */ |
2642 | if (cachep->ctor && !(cachep->flags & SLAB_POISON)) | |
51cc5068 | 2643 | cachep->ctor(objp + obj_offset(cachep)); |
1da177e4 LT |
2644 | |
2645 | if (cachep->flags & SLAB_RED_ZONE) { | |
2646 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) | |
2647 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2648 | " end of an object"); |
1da177e4 LT |
2649 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) |
2650 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2651 | " start of an object"); |
1da177e4 | 2652 | } |
a737b3e2 AM |
2653 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && |
2654 | OFF_SLAB(cachep) && cachep->flags & SLAB_POISON) | |
b28a02de | 2655 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 2656 | cachep->buffer_size / PAGE_SIZE, 0); |
1da177e4 LT |
2657 | #else |
2658 | if (cachep->ctor) | |
51cc5068 | 2659 | cachep->ctor(objp); |
1da177e4 | 2660 | #endif |
b28a02de | 2661 | slab_bufctl(slabp)[i] = i + 1; |
1da177e4 | 2662 | } |
b28a02de | 2663 | slab_bufctl(slabp)[i - 1] = BUFCTL_END; |
1da177e4 LT |
2664 | } |
2665 | ||
343e0d7a | 2666 | static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 2667 | { |
4b51d669 CL |
2668 | if (CONFIG_ZONE_DMA_FLAG) { |
2669 | if (flags & GFP_DMA) | |
2670 | BUG_ON(!(cachep->gfpflags & GFP_DMA)); | |
2671 | else | |
2672 | BUG_ON(cachep->gfpflags & GFP_DMA); | |
2673 | } | |
1da177e4 LT |
2674 | } |
2675 | ||
a737b3e2 AM |
2676 | static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, |
2677 | int nodeid) | |
78d382d7 | 2678 | { |
8fea4e96 | 2679 | void *objp = index_to_obj(cachep, slabp, slabp->free); |
78d382d7 MD |
2680 | kmem_bufctl_t next; |
2681 | ||
2682 | slabp->inuse++; | |
2683 | next = slab_bufctl(slabp)[slabp->free]; | |
2684 | #if DEBUG | |
2685 | slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE; | |
2686 | WARN_ON(slabp->nodeid != nodeid); | |
2687 | #endif | |
2688 | slabp->free = next; | |
2689 | ||
2690 | return objp; | |
2691 | } | |
2692 | ||
a737b3e2 AM |
2693 | static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, |
2694 | void *objp, int nodeid) | |
78d382d7 | 2695 | { |
8fea4e96 | 2696 | unsigned int objnr = obj_to_index(cachep, slabp, objp); |
78d382d7 MD |
2697 | |
2698 | #if DEBUG | |
2699 | /* Verify that the slab belongs to the intended node */ | |
2700 | WARN_ON(slabp->nodeid != nodeid); | |
2701 | ||
871751e2 | 2702 | if (slab_bufctl(slabp)[objnr] + 1 <= SLAB_LIMIT + 1) { |
78d382d7 | 2703 | printk(KERN_ERR "slab: double free detected in cache " |
a737b3e2 | 2704 | "'%s', objp %p\n", cachep->name, objp); |
78d382d7 MD |
2705 | BUG(); |
2706 | } | |
2707 | #endif | |
2708 | slab_bufctl(slabp)[objnr] = slabp->free; | |
2709 | slabp->free = objnr; | |
2710 | slabp->inuse--; | |
2711 | } | |
2712 | ||
4776874f PE |
2713 | /* |
2714 | * Map pages beginning at addr to the given cache and slab. This is required | |
2715 | * for the slab allocator to be able to lookup the cache and slab of a | |
2716 | * virtual address for kfree, ksize, kmem_ptr_validate, and slab debugging. | |
2717 | */ | |
2718 | static void slab_map_pages(struct kmem_cache *cache, struct slab *slab, | |
2719 | void *addr) | |
1da177e4 | 2720 | { |
4776874f | 2721 | int nr_pages; |
1da177e4 LT |
2722 | struct page *page; |
2723 | ||
4776874f | 2724 | page = virt_to_page(addr); |
84097518 | 2725 | |
4776874f | 2726 | nr_pages = 1; |
84097518 | 2727 | if (likely(!PageCompound(page))) |
4776874f PE |
2728 | nr_pages <<= cache->gfporder; |
2729 | ||
1da177e4 | 2730 | do { |
4776874f PE |
2731 | page_set_cache(page, cache); |
2732 | page_set_slab(page, slab); | |
1da177e4 | 2733 | page++; |
4776874f | 2734 | } while (--nr_pages); |
1da177e4 LT |
2735 | } |
2736 | ||
2737 | /* | |
2738 | * Grow (by 1) the number of slabs within a cache. This is called by | |
2739 | * kmem_cache_alloc() when there are no active objs left in a cache. | |
2740 | */ | |
3c517a61 CL |
2741 | static int cache_grow(struct kmem_cache *cachep, |
2742 | gfp_t flags, int nodeid, void *objp) | |
1da177e4 | 2743 | { |
b28a02de | 2744 | struct slab *slabp; |
b28a02de PE |
2745 | size_t offset; |
2746 | gfp_t local_flags; | |
e498be7d | 2747 | struct kmem_list3 *l3; |
1da177e4 | 2748 | |
a737b3e2 AM |
2749 | /* |
2750 | * Be lazy and only check for valid flags here, keeping it out of the | |
2751 | * critical path in kmem_cache_alloc(). | |
1da177e4 | 2752 | */ |
6cb06229 CL |
2753 | BUG_ON(flags & GFP_SLAB_BUG_MASK); |
2754 | local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK); | |
1da177e4 | 2755 | |
2e1217cf | 2756 | /* Take the l3 list lock to change the colour_next on this node */ |
1da177e4 | 2757 | check_irq_off(); |
2e1217cf RT |
2758 | l3 = cachep->nodelists[nodeid]; |
2759 | spin_lock(&l3->list_lock); | |
1da177e4 LT |
2760 | |
2761 | /* Get colour for the slab, and cal the next value. */ | |
2e1217cf RT |
2762 | offset = l3->colour_next; |
2763 | l3->colour_next++; | |
2764 | if (l3->colour_next >= cachep->colour) | |
2765 | l3->colour_next = 0; | |
2766 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2767 | |
2e1217cf | 2768 | offset *= cachep->colour_off; |
1da177e4 LT |
2769 | |
2770 | if (local_flags & __GFP_WAIT) | |
2771 | local_irq_enable(); | |
2772 | ||
2773 | /* | |
2774 | * The test for missing atomic flag is performed here, rather than | |
2775 | * the more obvious place, simply to reduce the critical path length | |
2776 | * in kmem_cache_alloc(). If a caller is seriously mis-behaving they | |
2777 | * will eventually be caught here (where it matters). | |
2778 | */ | |
2779 | kmem_flagcheck(cachep, flags); | |
2780 | ||
a737b3e2 AM |
2781 | /* |
2782 | * Get mem for the objs. Attempt to allocate a physical page from | |
2783 | * 'nodeid'. | |
e498be7d | 2784 | */ |
3c517a61 | 2785 | if (!objp) |
b8c1c5da | 2786 | objp = kmem_getpages(cachep, local_flags, nodeid); |
a737b3e2 | 2787 | if (!objp) |
1da177e4 LT |
2788 | goto failed; |
2789 | ||
2790 | /* Get slab management. */ | |
3c517a61 | 2791 | slabp = alloc_slabmgmt(cachep, objp, offset, |
6cb06229 | 2792 | local_flags & ~GFP_CONSTRAINT_MASK, nodeid); |
a737b3e2 | 2793 | if (!slabp) |
1da177e4 LT |
2794 | goto opps1; |
2795 | ||
4776874f | 2796 | slab_map_pages(cachep, slabp, objp); |
1da177e4 | 2797 | |
a35afb83 | 2798 | cache_init_objs(cachep, slabp); |
1da177e4 LT |
2799 | |
2800 | if (local_flags & __GFP_WAIT) | |
2801 | local_irq_disable(); | |
2802 | check_irq_off(); | |
e498be7d | 2803 | spin_lock(&l3->list_lock); |
1da177e4 LT |
2804 | |
2805 | /* Make slab active. */ | |
e498be7d | 2806 | list_add_tail(&slabp->list, &(l3->slabs_free)); |
1da177e4 | 2807 | STATS_INC_GROWN(cachep); |
e498be7d CL |
2808 | l3->free_objects += cachep->num; |
2809 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2810 | return 1; |
a737b3e2 | 2811 | opps1: |
1da177e4 | 2812 | kmem_freepages(cachep, objp); |
a737b3e2 | 2813 | failed: |
1da177e4 LT |
2814 | if (local_flags & __GFP_WAIT) |
2815 | local_irq_disable(); | |
2816 | return 0; | |
2817 | } | |
2818 | ||
2819 | #if DEBUG | |
2820 | ||
2821 | /* | |
2822 | * Perform extra freeing checks: | |
2823 | * - detect bad pointers. | |
2824 | * - POISON/RED_ZONE checking | |
1da177e4 LT |
2825 | */ |
2826 | static void kfree_debugcheck(const void *objp) | |
2827 | { | |
1da177e4 LT |
2828 | if (!virt_addr_valid(objp)) { |
2829 | printk(KERN_ERR "kfree_debugcheck: out of range ptr %lxh.\n", | |
b28a02de PE |
2830 | (unsigned long)objp); |
2831 | BUG(); | |
1da177e4 | 2832 | } |
1da177e4 LT |
2833 | } |
2834 | ||
58ce1fd5 PE |
2835 | static inline void verify_redzone_free(struct kmem_cache *cache, void *obj) |
2836 | { | |
b46b8f19 | 2837 | unsigned long long redzone1, redzone2; |
58ce1fd5 PE |
2838 | |
2839 | redzone1 = *dbg_redzone1(cache, obj); | |
2840 | redzone2 = *dbg_redzone2(cache, obj); | |
2841 | ||
2842 | /* | |
2843 | * Redzone is ok. | |
2844 | */ | |
2845 | if (redzone1 == RED_ACTIVE && redzone2 == RED_ACTIVE) | |
2846 | return; | |
2847 | ||
2848 | if (redzone1 == RED_INACTIVE && redzone2 == RED_INACTIVE) | |
2849 | slab_error(cache, "double free detected"); | |
2850 | else | |
2851 | slab_error(cache, "memory outside object was overwritten"); | |
2852 | ||
b46b8f19 | 2853 | printk(KERN_ERR "%p: redzone 1:0x%llx, redzone 2:0x%llx.\n", |
58ce1fd5 PE |
2854 | obj, redzone1, redzone2); |
2855 | } | |
2856 | ||
343e0d7a | 2857 | static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, |
b28a02de | 2858 | void *caller) |
1da177e4 LT |
2859 | { |
2860 | struct page *page; | |
2861 | unsigned int objnr; | |
2862 | struct slab *slabp; | |
2863 | ||
80cbd911 MW |
2864 | BUG_ON(virt_to_cache(objp) != cachep); |
2865 | ||
3dafccf2 | 2866 | objp -= obj_offset(cachep); |
1da177e4 | 2867 | kfree_debugcheck(objp); |
b49af68f | 2868 | page = virt_to_head_page(objp); |
1da177e4 | 2869 | |
065d41cb | 2870 | slabp = page_get_slab(page); |
1da177e4 LT |
2871 | |
2872 | if (cachep->flags & SLAB_RED_ZONE) { | |
58ce1fd5 | 2873 | verify_redzone_free(cachep, objp); |
1da177e4 LT |
2874 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; |
2875 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
2876 | } | |
2877 | if (cachep->flags & SLAB_STORE_USER) | |
2878 | *dbg_userword(cachep, objp) = caller; | |
2879 | ||
8fea4e96 | 2880 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 LT |
2881 | |
2882 | BUG_ON(objnr >= cachep->num); | |
8fea4e96 | 2883 | BUG_ON(objp != index_to_obj(cachep, slabp, objnr)); |
1da177e4 | 2884 | |
871751e2 AV |
2885 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
2886 | slab_bufctl(slabp)[objnr] = BUFCTL_FREE; | |
2887 | #endif | |
1da177e4 LT |
2888 | if (cachep->flags & SLAB_POISON) { |
2889 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
a737b3e2 | 2890 | if ((cachep->buffer_size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) { |
1da177e4 | 2891 | store_stackinfo(cachep, objp, (unsigned long)caller); |
b28a02de | 2892 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 2893 | cachep->buffer_size / PAGE_SIZE, 0); |
1da177e4 LT |
2894 | } else { |
2895 | poison_obj(cachep, objp, POISON_FREE); | |
2896 | } | |
2897 | #else | |
2898 | poison_obj(cachep, objp, POISON_FREE); | |
2899 | #endif | |
2900 | } | |
2901 | return objp; | |
2902 | } | |
2903 | ||
343e0d7a | 2904 | static void check_slabp(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 LT |
2905 | { |
2906 | kmem_bufctl_t i; | |
2907 | int entries = 0; | |
b28a02de | 2908 | |
1da177e4 LT |
2909 | /* Check slab's freelist to see if this obj is there. */ |
2910 | for (i = slabp->free; i != BUFCTL_END; i = slab_bufctl(slabp)[i]) { | |
2911 | entries++; | |
2912 | if (entries > cachep->num || i >= cachep->num) | |
2913 | goto bad; | |
2914 | } | |
2915 | if (entries != cachep->num - slabp->inuse) { | |
a737b3e2 AM |
2916 | bad: |
2917 | printk(KERN_ERR "slab: Internal list corruption detected in " | |
2918 | "cache '%s'(%d), slabp %p(%d). Hexdump:\n", | |
2919 | cachep->name, cachep->num, slabp, slabp->inuse); | |
b28a02de | 2920 | for (i = 0; |
264132bc | 2921 | i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t); |
b28a02de | 2922 | i++) { |
a737b3e2 | 2923 | if (i % 16 == 0) |
1da177e4 | 2924 | printk("\n%03x:", i); |
b28a02de | 2925 | printk(" %02x", ((unsigned char *)slabp)[i]); |
1da177e4 LT |
2926 | } |
2927 | printk("\n"); | |
2928 | BUG(); | |
2929 | } | |
2930 | } | |
2931 | #else | |
2932 | #define kfree_debugcheck(x) do { } while(0) | |
2933 | #define cache_free_debugcheck(x,objp,z) (objp) | |
2934 | #define check_slabp(x,y) do { } while(0) | |
2935 | #endif | |
2936 | ||
343e0d7a | 2937 | static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 LT |
2938 | { |
2939 | int batchcount; | |
2940 | struct kmem_list3 *l3; | |
2941 | struct array_cache *ac; | |
1ca4cb24 PE |
2942 | int node; |
2943 | ||
6d2144d3 | 2944 | retry: |
1da177e4 | 2945 | check_irq_off(); |
6d2144d3 | 2946 | node = numa_node_id(); |
9a2dba4b | 2947 | ac = cpu_cache_get(cachep); |
1da177e4 LT |
2948 | batchcount = ac->batchcount; |
2949 | if (!ac->touched && batchcount > BATCHREFILL_LIMIT) { | |
a737b3e2 AM |
2950 | /* |
2951 | * If there was little recent activity on this cache, then | |
2952 | * perform only a partial refill. Otherwise we could generate | |
2953 | * refill bouncing. | |
1da177e4 LT |
2954 | */ |
2955 | batchcount = BATCHREFILL_LIMIT; | |
2956 | } | |
1ca4cb24 | 2957 | l3 = cachep->nodelists[node]; |
e498be7d CL |
2958 | |
2959 | BUG_ON(ac->avail > 0 || !l3); | |
2960 | spin_lock(&l3->list_lock); | |
1da177e4 | 2961 | |
3ded175a | 2962 | /* See if we can refill from the shared array */ |
44b57f1c NP |
2963 | if (l3->shared && transfer_objects(ac, l3->shared, batchcount)) { |
2964 | l3->shared->touched = 1; | |
3ded175a | 2965 | goto alloc_done; |
44b57f1c | 2966 | } |
3ded175a | 2967 | |
1da177e4 LT |
2968 | while (batchcount > 0) { |
2969 | struct list_head *entry; | |
2970 | struct slab *slabp; | |
2971 | /* Get slab alloc is to come from. */ | |
2972 | entry = l3->slabs_partial.next; | |
2973 | if (entry == &l3->slabs_partial) { | |
2974 | l3->free_touched = 1; | |
2975 | entry = l3->slabs_free.next; | |
2976 | if (entry == &l3->slabs_free) | |
2977 | goto must_grow; | |
2978 | } | |
2979 | ||
2980 | slabp = list_entry(entry, struct slab, list); | |
2981 | check_slabp(cachep, slabp); | |
2982 | check_spinlock_acquired(cachep); | |
714b8171 PE |
2983 | |
2984 | /* | |
2985 | * The slab was either on partial or free list so | |
2986 | * there must be at least one object available for | |
2987 | * allocation. | |
2988 | */ | |
249b9f33 | 2989 | BUG_ON(slabp->inuse >= cachep->num); |
714b8171 | 2990 | |
1da177e4 | 2991 | while (slabp->inuse < cachep->num && batchcount--) { |
1da177e4 LT |
2992 | STATS_INC_ALLOCED(cachep); |
2993 | STATS_INC_ACTIVE(cachep); | |
2994 | STATS_SET_HIGH(cachep); | |
2995 | ||
78d382d7 | 2996 | ac->entry[ac->avail++] = slab_get_obj(cachep, slabp, |
1ca4cb24 | 2997 | node); |
1da177e4 LT |
2998 | } |
2999 | check_slabp(cachep, slabp); | |
3000 | ||
3001 | /* move slabp to correct slabp list: */ | |
3002 | list_del(&slabp->list); | |
3003 | if (slabp->free == BUFCTL_END) | |
3004 | list_add(&slabp->list, &l3->slabs_full); | |
3005 | else | |
3006 | list_add(&slabp->list, &l3->slabs_partial); | |
3007 | } | |
3008 | ||
a737b3e2 | 3009 | must_grow: |
1da177e4 | 3010 | l3->free_objects -= ac->avail; |
a737b3e2 | 3011 | alloc_done: |
e498be7d | 3012 | spin_unlock(&l3->list_lock); |
1da177e4 LT |
3013 | |
3014 | if (unlikely(!ac->avail)) { | |
3015 | int x; | |
3c517a61 | 3016 | x = cache_grow(cachep, flags | GFP_THISNODE, node, NULL); |
e498be7d | 3017 | |
a737b3e2 | 3018 | /* cache_grow can reenable interrupts, then ac could change. */ |
9a2dba4b | 3019 | ac = cpu_cache_get(cachep); |
a737b3e2 | 3020 | if (!x && ac->avail == 0) /* no objects in sight? abort */ |
1da177e4 LT |
3021 | return NULL; |
3022 | ||
a737b3e2 | 3023 | if (!ac->avail) /* objects refilled by interrupt? */ |
1da177e4 LT |
3024 | goto retry; |
3025 | } | |
3026 | ac->touched = 1; | |
e498be7d | 3027 | return ac->entry[--ac->avail]; |
1da177e4 LT |
3028 | } |
3029 | ||
a737b3e2 AM |
3030 | static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep, |
3031 | gfp_t flags) | |
1da177e4 LT |
3032 | { |
3033 | might_sleep_if(flags & __GFP_WAIT); | |
3034 | #if DEBUG | |
3035 | kmem_flagcheck(cachep, flags); | |
3036 | #endif | |
3037 | } | |
3038 | ||
3039 | #if DEBUG | |
a737b3e2 AM |
3040 | static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, |
3041 | gfp_t flags, void *objp, void *caller) | |
1da177e4 | 3042 | { |
b28a02de | 3043 | if (!objp) |
1da177e4 | 3044 | return objp; |
b28a02de | 3045 | if (cachep->flags & SLAB_POISON) { |
1da177e4 | 3046 | #ifdef CONFIG_DEBUG_PAGEALLOC |
3dafccf2 | 3047 | if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) |
b28a02de | 3048 | kernel_map_pages(virt_to_page(objp), |
3dafccf2 | 3049 | cachep->buffer_size / PAGE_SIZE, 1); |
1da177e4 LT |
3050 | else |
3051 | check_poison_obj(cachep, objp); | |
3052 | #else | |
3053 | check_poison_obj(cachep, objp); | |
3054 | #endif | |
3055 | poison_obj(cachep, objp, POISON_INUSE); | |
3056 | } | |
3057 | if (cachep->flags & SLAB_STORE_USER) | |
3058 | *dbg_userword(cachep, objp) = caller; | |
3059 | ||
3060 | if (cachep->flags & SLAB_RED_ZONE) { | |
a737b3e2 AM |
3061 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE || |
3062 | *dbg_redzone2(cachep, objp) != RED_INACTIVE) { | |
3063 | slab_error(cachep, "double free, or memory outside" | |
3064 | " object was overwritten"); | |
b28a02de | 3065 | printk(KERN_ERR |
b46b8f19 | 3066 | "%p: redzone 1:0x%llx, redzone 2:0x%llx\n", |
a737b3e2 AM |
3067 | objp, *dbg_redzone1(cachep, objp), |
3068 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
3069 | } |
3070 | *dbg_redzone1(cachep, objp) = RED_ACTIVE; | |
3071 | *dbg_redzone2(cachep, objp) = RED_ACTIVE; | |
3072 | } | |
871751e2 AV |
3073 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
3074 | { | |
3075 | struct slab *slabp; | |
3076 | unsigned objnr; | |
3077 | ||
b49af68f | 3078 | slabp = page_get_slab(virt_to_head_page(objp)); |
871751e2 AV |
3079 | objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size; |
3080 | slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE; | |
3081 | } | |
3082 | #endif | |
3dafccf2 | 3083 | objp += obj_offset(cachep); |
4f104934 | 3084 | if (cachep->ctor && cachep->flags & SLAB_POISON) |
51cc5068 | 3085 | cachep->ctor(objp); |
a44b56d3 KH |
3086 | #if ARCH_SLAB_MINALIGN |
3087 | if ((u32)objp & (ARCH_SLAB_MINALIGN-1)) { | |
3088 | printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n", | |
3089 | objp, ARCH_SLAB_MINALIGN); | |
3090 | } | |
3091 | #endif | |
1da177e4 LT |
3092 | return objp; |
3093 | } | |
3094 | #else | |
3095 | #define cache_alloc_debugcheck_after(a,b,objp,d) (objp) | |
3096 | #endif | |
3097 | ||
773ff60e | 3098 | static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags) |
8a8b6502 AM |
3099 | { |
3100 | if (cachep == &cache_cache) | |
773ff60e | 3101 | return false; |
8a8b6502 | 3102 | |
4c13dd3b | 3103 | return should_failslab(obj_size(cachep), flags, cachep->flags); |
8a8b6502 AM |
3104 | } |
3105 | ||
343e0d7a | 3106 | static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 3107 | { |
b28a02de | 3108 | void *objp; |
1da177e4 LT |
3109 | struct array_cache *ac; |
3110 | ||
5c382300 | 3111 | check_irq_off(); |
8a8b6502 | 3112 | |
9a2dba4b | 3113 | ac = cpu_cache_get(cachep); |
1da177e4 LT |
3114 | if (likely(ac->avail)) { |
3115 | STATS_INC_ALLOCHIT(cachep); | |
3116 | ac->touched = 1; | |
e498be7d | 3117 | objp = ac->entry[--ac->avail]; |
1da177e4 LT |
3118 | } else { |
3119 | STATS_INC_ALLOCMISS(cachep); | |
3120 | objp = cache_alloc_refill(cachep, flags); | |
ddbf2e83 O |
3121 | /* |
3122 | * the 'ac' may be updated by cache_alloc_refill(), | |
3123 | * and kmemleak_erase() requires its correct value. | |
3124 | */ | |
3125 | ac = cpu_cache_get(cachep); | |
1da177e4 | 3126 | } |
d5cff635 CM |
3127 | /* |
3128 | * To avoid a false negative, if an object that is in one of the | |
3129 | * per-CPU caches is leaked, we need to make sure kmemleak doesn't | |
3130 | * treat the array pointers as a reference to the object. | |
3131 | */ | |
f3d8b53a O |
3132 | if (objp) |
3133 | kmemleak_erase(&ac->entry[ac->avail]); | |
5c382300 AK |
3134 | return objp; |
3135 | } | |
3136 | ||
e498be7d | 3137 | #ifdef CONFIG_NUMA |
c61afb18 | 3138 | /* |
b2455396 | 3139 | * Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY. |
c61afb18 PJ |
3140 | * |
3141 | * If we are in_interrupt, then process context, including cpusets and | |
3142 | * mempolicy, may not apply and should not be used for allocation policy. | |
3143 | */ | |
3144 | static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) | |
3145 | { | |
3146 | int nid_alloc, nid_here; | |
3147 | ||
765c4507 | 3148 | if (in_interrupt() || (flags & __GFP_THISNODE)) |
c61afb18 PJ |
3149 | return NULL; |
3150 | nid_alloc = nid_here = numa_node_id(); | |
3151 | if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD)) | |
3152 | nid_alloc = cpuset_mem_spread_node(); | |
3153 | else if (current->mempolicy) | |
3154 | nid_alloc = slab_node(current->mempolicy); | |
3155 | if (nid_alloc != nid_here) | |
8b98c169 | 3156 | return ____cache_alloc_node(cachep, flags, nid_alloc); |
c61afb18 PJ |
3157 | return NULL; |
3158 | } | |
3159 | ||
765c4507 CL |
3160 | /* |
3161 | * Fallback function if there was no memory available and no objects on a | |
3c517a61 CL |
3162 | * certain node and fall back is permitted. First we scan all the |
3163 | * available nodelists for available objects. If that fails then we | |
3164 | * perform an allocation without specifying a node. This allows the page | |
3165 | * allocator to do its reclaim / fallback magic. We then insert the | |
3166 | * slab into the proper nodelist and then allocate from it. | |
765c4507 | 3167 | */ |
8c8cc2c1 | 3168 | static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) |
765c4507 | 3169 | { |
8c8cc2c1 PE |
3170 | struct zonelist *zonelist; |
3171 | gfp_t local_flags; | |
dd1a239f | 3172 | struct zoneref *z; |
54a6eb5c MG |
3173 | struct zone *zone; |
3174 | enum zone_type high_zoneidx = gfp_zone(flags); | |
765c4507 | 3175 | void *obj = NULL; |
3c517a61 | 3176 | int nid; |
8c8cc2c1 PE |
3177 | |
3178 | if (flags & __GFP_THISNODE) | |
3179 | return NULL; | |
3180 | ||
0e88460d | 3181 | zonelist = node_zonelist(slab_node(current->mempolicy), flags); |
6cb06229 | 3182 | local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK); |
765c4507 | 3183 | |
3c517a61 CL |
3184 | retry: |
3185 | /* | |
3186 | * Look through allowed nodes for objects available | |
3187 | * from existing per node queues. | |
3188 | */ | |
54a6eb5c MG |
3189 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
3190 | nid = zone_to_nid(zone); | |
aedb0eb1 | 3191 | |
54a6eb5c | 3192 | if (cpuset_zone_allowed_hardwall(zone, flags) && |
3c517a61 | 3193 | cache->nodelists[nid] && |
481c5346 | 3194 | cache->nodelists[nid]->free_objects) { |
3c517a61 CL |
3195 | obj = ____cache_alloc_node(cache, |
3196 | flags | GFP_THISNODE, nid); | |
481c5346 CL |
3197 | if (obj) |
3198 | break; | |
3199 | } | |
3c517a61 CL |
3200 | } |
3201 | ||
cfce6604 | 3202 | if (!obj) { |
3c517a61 CL |
3203 | /* |
3204 | * This allocation will be performed within the constraints | |
3205 | * of the current cpuset / memory policy requirements. | |
3206 | * We may trigger various forms of reclaim on the allowed | |
3207 | * set and go into memory reserves if necessary. | |
3208 | */ | |
dd47ea75 CL |
3209 | if (local_flags & __GFP_WAIT) |
3210 | local_irq_enable(); | |
3211 | kmem_flagcheck(cache, flags); | |
6484eb3e | 3212 | obj = kmem_getpages(cache, local_flags, numa_node_id()); |
dd47ea75 CL |
3213 | if (local_flags & __GFP_WAIT) |
3214 | local_irq_disable(); | |
3c517a61 CL |
3215 | if (obj) { |
3216 | /* | |
3217 | * Insert into the appropriate per node queues | |
3218 | */ | |
3219 | nid = page_to_nid(virt_to_page(obj)); | |
3220 | if (cache_grow(cache, flags, nid, obj)) { | |
3221 | obj = ____cache_alloc_node(cache, | |
3222 | flags | GFP_THISNODE, nid); | |
3223 | if (!obj) | |
3224 | /* | |
3225 | * Another processor may allocate the | |
3226 | * objects in the slab since we are | |
3227 | * not holding any locks. | |
3228 | */ | |
3229 | goto retry; | |
3230 | } else { | |
b6a60451 | 3231 | /* cache_grow already freed obj */ |
3c517a61 CL |
3232 | obj = NULL; |
3233 | } | |
3234 | } | |
aedb0eb1 | 3235 | } |
765c4507 CL |
3236 | return obj; |
3237 | } | |
3238 | ||
e498be7d CL |
3239 | /* |
3240 | * A interface to enable slab creation on nodeid | |
1da177e4 | 3241 | */ |
8b98c169 | 3242 | static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, |
a737b3e2 | 3243 | int nodeid) |
e498be7d CL |
3244 | { |
3245 | struct list_head *entry; | |
b28a02de PE |
3246 | struct slab *slabp; |
3247 | struct kmem_list3 *l3; | |
3248 | void *obj; | |
b28a02de PE |
3249 | int x; |
3250 | ||
3251 | l3 = cachep->nodelists[nodeid]; | |
3252 | BUG_ON(!l3); | |
3253 | ||
a737b3e2 | 3254 | retry: |
ca3b9b91 | 3255 | check_irq_off(); |
b28a02de PE |
3256 | spin_lock(&l3->list_lock); |
3257 | entry = l3->slabs_partial.next; | |
3258 | if (entry == &l3->slabs_partial) { | |
3259 | l3->free_touched = 1; | |
3260 | entry = l3->slabs_free.next; | |
3261 | if (entry == &l3->slabs_free) | |
3262 | goto must_grow; | |
3263 | } | |
3264 | ||
3265 | slabp = list_entry(entry, struct slab, list); | |
3266 | check_spinlock_acquired_node(cachep, nodeid); | |
3267 | check_slabp(cachep, slabp); | |
3268 | ||
3269 | STATS_INC_NODEALLOCS(cachep); | |
3270 | STATS_INC_ACTIVE(cachep); | |
3271 | STATS_SET_HIGH(cachep); | |
3272 | ||
3273 | BUG_ON(slabp->inuse == cachep->num); | |
3274 | ||
78d382d7 | 3275 | obj = slab_get_obj(cachep, slabp, nodeid); |
b28a02de PE |
3276 | check_slabp(cachep, slabp); |
3277 | l3->free_objects--; | |
3278 | /* move slabp to correct slabp list: */ | |
3279 | list_del(&slabp->list); | |
3280 | ||
a737b3e2 | 3281 | if (slabp->free == BUFCTL_END) |
b28a02de | 3282 | list_add(&slabp->list, &l3->slabs_full); |
a737b3e2 | 3283 | else |
b28a02de | 3284 | list_add(&slabp->list, &l3->slabs_partial); |
e498be7d | 3285 | |
b28a02de PE |
3286 | spin_unlock(&l3->list_lock); |
3287 | goto done; | |
e498be7d | 3288 | |
a737b3e2 | 3289 | must_grow: |
b28a02de | 3290 | spin_unlock(&l3->list_lock); |
3c517a61 | 3291 | x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL); |
765c4507 CL |
3292 | if (x) |
3293 | goto retry; | |
1da177e4 | 3294 | |
8c8cc2c1 | 3295 | return fallback_alloc(cachep, flags); |
e498be7d | 3296 | |
a737b3e2 | 3297 | done: |
b28a02de | 3298 | return obj; |
e498be7d | 3299 | } |
8c8cc2c1 PE |
3300 | |
3301 | /** | |
3302 | * kmem_cache_alloc_node - Allocate an object on the specified node | |
3303 | * @cachep: The cache to allocate from. | |
3304 | * @flags: See kmalloc(). | |
3305 | * @nodeid: node number of the target node. | |
3306 | * @caller: return address of caller, used for debug information | |
3307 | * | |
3308 | * Identical to kmem_cache_alloc but it will allocate memory on the given | |
3309 | * node, which can improve the performance for cpu bound structures. | |
3310 | * | |
3311 | * Fallback to other node is possible if __GFP_THISNODE is not set. | |
3312 | */ | |
3313 | static __always_inline void * | |
3314 | __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid, | |
3315 | void *caller) | |
3316 | { | |
3317 | unsigned long save_flags; | |
3318 | void *ptr; | |
3319 | ||
dcce284a | 3320 | flags &= gfp_allowed_mask; |
7e85ee0c | 3321 | |
cf40bd16 NP |
3322 | lockdep_trace_alloc(flags); |
3323 | ||
773ff60e | 3324 | if (slab_should_failslab(cachep, flags)) |
824ebef1 AM |
3325 | return NULL; |
3326 | ||
8c8cc2c1 PE |
3327 | cache_alloc_debugcheck_before(cachep, flags); |
3328 | local_irq_save(save_flags); | |
3329 | ||
8e15b79c | 3330 | if (nodeid == -1) |
8c8cc2c1 PE |
3331 | nodeid = numa_node_id(); |
3332 | ||
3333 | if (unlikely(!cachep->nodelists[nodeid])) { | |
3334 | /* Node not bootstrapped yet */ | |
3335 | ptr = fallback_alloc(cachep, flags); | |
3336 | goto out; | |
3337 | } | |
3338 | ||
3339 | if (nodeid == numa_node_id()) { | |
3340 | /* | |
3341 | * Use the locally cached objects if possible. | |
3342 | * However ____cache_alloc does not allow fallback | |
3343 | * to other nodes. It may fail while we still have | |
3344 | * objects on other nodes available. | |
3345 | */ | |
3346 | ptr = ____cache_alloc(cachep, flags); | |
3347 | if (ptr) | |
3348 | goto out; | |
3349 | } | |
3350 | /* ___cache_alloc_node can fall back to other nodes */ | |
3351 | ptr = ____cache_alloc_node(cachep, flags, nodeid); | |
3352 | out: | |
3353 | local_irq_restore(save_flags); | |
3354 | ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller); | |
d5cff635 CM |
3355 | kmemleak_alloc_recursive(ptr, obj_size(cachep), 1, cachep->flags, |
3356 | flags); | |
8c8cc2c1 | 3357 | |
c175eea4 PE |
3358 | if (likely(ptr)) |
3359 | kmemcheck_slab_alloc(cachep, flags, ptr, obj_size(cachep)); | |
3360 | ||
d07dbea4 CL |
3361 | if (unlikely((flags & __GFP_ZERO) && ptr)) |
3362 | memset(ptr, 0, obj_size(cachep)); | |
3363 | ||
8c8cc2c1 PE |
3364 | return ptr; |
3365 | } | |
3366 | ||
3367 | static __always_inline void * | |
3368 | __do_cache_alloc(struct kmem_cache *cache, gfp_t flags) | |
3369 | { | |
3370 | void *objp; | |
3371 | ||
3372 | if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { | |
3373 | objp = alternate_node_alloc(cache, flags); | |
3374 | if (objp) | |
3375 | goto out; | |
3376 | } | |
3377 | objp = ____cache_alloc(cache, flags); | |
3378 | ||
3379 | /* | |
3380 | * We may just have run out of memory on the local node. | |
3381 | * ____cache_alloc_node() knows how to locate memory on other nodes | |
3382 | */ | |
3383 | if (!objp) | |
3384 | objp = ____cache_alloc_node(cache, flags, numa_node_id()); | |
3385 | ||
3386 | out: | |
3387 | return objp; | |
3388 | } | |
3389 | #else | |
3390 | ||
3391 | static __always_inline void * | |
3392 | __do_cache_alloc(struct kmem_cache *cachep, gfp_t flags) | |
3393 | { | |
3394 | return ____cache_alloc(cachep, flags); | |
3395 | } | |
3396 | ||
3397 | #endif /* CONFIG_NUMA */ | |
3398 | ||
3399 | static __always_inline void * | |
3400 | __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller) | |
3401 | { | |
3402 | unsigned long save_flags; | |
3403 | void *objp; | |
3404 | ||
dcce284a | 3405 | flags &= gfp_allowed_mask; |
7e85ee0c | 3406 | |
cf40bd16 NP |
3407 | lockdep_trace_alloc(flags); |
3408 | ||
773ff60e | 3409 | if (slab_should_failslab(cachep, flags)) |
824ebef1 AM |
3410 | return NULL; |
3411 | ||
8c8cc2c1 PE |
3412 | cache_alloc_debugcheck_before(cachep, flags); |
3413 | local_irq_save(save_flags); | |
3414 | objp = __do_cache_alloc(cachep, flags); | |
3415 | local_irq_restore(save_flags); | |
3416 | objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); | |
d5cff635 CM |
3417 | kmemleak_alloc_recursive(objp, obj_size(cachep), 1, cachep->flags, |
3418 | flags); | |
8c8cc2c1 PE |
3419 | prefetchw(objp); |
3420 | ||
c175eea4 PE |
3421 | if (likely(objp)) |
3422 | kmemcheck_slab_alloc(cachep, flags, objp, obj_size(cachep)); | |
3423 | ||
d07dbea4 CL |
3424 | if (unlikely((flags & __GFP_ZERO) && objp)) |
3425 | memset(objp, 0, obj_size(cachep)); | |
3426 | ||
8c8cc2c1 PE |
3427 | return objp; |
3428 | } | |
e498be7d CL |
3429 | |
3430 | /* | |
3431 | * Caller needs to acquire correct kmem_list's list_lock | |
3432 | */ | |
343e0d7a | 3433 | static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, |
b28a02de | 3434 | int node) |
1da177e4 LT |
3435 | { |
3436 | int i; | |
e498be7d | 3437 | struct kmem_list3 *l3; |
1da177e4 LT |
3438 | |
3439 | for (i = 0; i < nr_objects; i++) { | |
3440 | void *objp = objpp[i]; | |
3441 | struct slab *slabp; | |
1da177e4 | 3442 | |
6ed5eb22 | 3443 | slabp = virt_to_slab(objp); |
ff69416e | 3444 | l3 = cachep->nodelists[node]; |
1da177e4 | 3445 | list_del(&slabp->list); |
ff69416e | 3446 | check_spinlock_acquired_node(cachep, node); |
1da177e4 | 3447 | check_slabp(cachep, slabp); |
78d382d7 | 3448 | slab_put_obj(cachep, slabp, objp, node); |
1da177e4 | 3449 | STATS_DEC_ACTIVE(cachep); |
e498be7d | 3450 | l3->free_objects++; |
1da177e4 LT |
3451 | check_slabp(cachep, slabp); |
3452 | ||
3453 | /* fixup slab chains */ | |
3454 | if (slabp->inuse == 0) { | |
e498be7d CL |
3455 | if (l3->free_objects > l3->free_limit) { |
3456 | l3->free_objects -= cachep->num; | |
e5ac9c5a RT |
3457 | /* No need to drop any previously held |
3458 | * lock here, even if we have a off-slab slab | |
3459 | * descriptor it is guaranteed to come from | |
3460 | * a different cache, refer to comments before | |
3461 | * alloc_slabmgmt. | |
3462 | */ | |
1da177e4 LT |
3463 | slab_destroy(cachep, slabp); |
3464 | } else { | |
e498be7d | 3465 | list_add(&slabp->list, &l3->slabs_free); |
1da177e4 LT |
3466 | } |
3467 | } else { | |
3468 | /* Unconditionally move a slab to the end of the | |
3469 | * partial list on free - maximum time for the | |
3470 | * other objects to be freed, too. | |
3471 | */ | |
e498be7d | 3472 | list_add_tail(&slabp->list, &l3->slabs_partial); |
1da177e4 LT |
3473 | } |
3474 | } | |
3475 | } | |
3476 | ||
343e0d7a | 3477 | static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) |
1da177e4 LT |
3478 | { |
3479 | int batchcount; | |
e498be7d | 3480 | struct kmem_list3 *l3; |
ff69416e | 3481 | int node = numa_node_id(); |
1da177e4 LT |
3482 | |
3483 | batchcount = ac->batchcount; | |
3484 | #if DEBUG | |
3485 | BUG_ON(!batchcount || batchcount > ac->avail); | |
3486 | #endif | |
3487 | check_irq_off(); | |
ff69416e | 3488 | l3 = cachep->nodelists[node]; |
873623df | 3489 | spin_lock(&l3->list_lock); |
e498be7d CL |
3490 | if (l3->shared) { |
3491 | struct array_cache *shared_array = l3->shared; | |
b28a02de | 3492 | int max = shared_array->limit - shared_array->avail; |
1da177e4 LT |
3493 | if (max) { |
3494 | if (batchcount > max) | |
3495 | batchcount = max; | |
e498be7d | 3496 | memcpy(&(shared_array->entry[shared_array->avail]), |
b28a02de | 3497 | ac->entry, sizeof(void *) * batchcount); |
1da177e4 LT |
3498 | shared_array->avail += batchcount; |
3499 | goto free_done; | |
3500 | } | |
3501 | } | |
3502 | ||
ff69416e | 3503 | free_block(cachep, ac->entry, batchcount, node); |
a737b3e2 | 3504 | free_done: |
1da177e4 LT |
3505 | #if STATS |
3506 | { | |
3507 | int i = 0; | |
3508 | struct list_head *p; | |
3509 | ||
e498be7d CL |
3510 | p = l3->slabs_free.next; |
3511 | while (p != &(l3->slabs_free)) { | |
1da177e4 LT |
3512 | struct slab *slabp; |
3513 | ||
3514 | slabp = list_entry(p, struct slab, list); | |
3515 | BUG_ON(slabp->inuse); | |
3516 | ||
3517 | i++; | |
3518 | p = p->next; | |
3519 | } | |
3520 | STATS_SET_FREEABLE(cachep, i); | |
3521 | } | |
3522 | #endif | |
e498be7d | 3523 | spin_unlock(&l3->list_lock); |
1da177e4 | 3524 | ac->avail -= batchcount; |
a737b3e2 | 3525 | memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail); |
1da177e4 LT |
3526 | } |
3527 | ||
3528 | /* | |
a737b3e2 AM |
3529 | * Release an obj back to its cache. If the obj has a constructed state, it must |
3530 | * be in this state _before_ it is released. Called with disabled ints. | |
1da177e4 | 3531 | */ |
873623df | 3532 | static inline void __cache_free(struct kmem_cache *cachep, void *objp) |
1da177e4 | 3533 | { |
9a2dba4b | 3534 | struct array_cache *ac = cpu_cache_get(cachep); |
1da177e4 LT |
3535 | |
3536 | check_irq_off(); | |
d5cff635 | 3537 | kmemleak_free_recursive(objp, cachep->flags); |
1da177e4 LT |
3538 | objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0)); |
3539 | ||
c175eea4 PE |
3540 | kmemcheck_slab_free(cachep, objp, obj_size(cachep)); |
3541 | ||
1807a1aa SS |
3542 | /* |
3543 | * Skip calling cache_free_alien() when the platform is not numa. | |
3544 | * This will avoid cache misses that happen while accessing slabp (which | |
3545 | * is per page memory reference) to get nodeid. Instead use a global | |
3546 | * variable to skip the call, which is mostly likely to be present in | |
3547 | * the cache. | |
3548 | */ | |
b6e68bc1 | 3549 | if (nr_online_nodes > 1 && cache_free_alien(cachep, objp)) |
729bd0b7 PE |
3550 | return; |
3551 | ||
1da177e4 LT |
3552 | if (likely(ac->avail < ac->limit)) { |
3553 | STATS_INC_FREEHIT(cachep); | |
e498be7d | 3554 | ac->entry[ac->avail++] = objp; |
1da177e4 LT |
3555 | return; |
3556 | } else { | |
3557 | STATS_INC_FREEMISS(cachep); | |
3558 | cache_flusharray(cachep, ac); | |
e498be7d | 3559 | ac->entry[ac->avail++] = objp; |
1da177e4 LT |
3560 | } |
3561 | } | |
3562 | ||
3563 | /** | |
3564 | * kmem_cache_alloc - Allocate an object | |
3565 | * @cachep: The cache to allocate from. | |
3566 | * @flags: See kmalloc(). | |
3567 | * | |
3568 | * Allocate an object from this cache. The flags are only relevant | |
3569 | * if the cache has no available objects. | |
3570 | */ | |
343e0d7a | 3571 | void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 3572 | { |
36555751 EGM |
3573 | void *ret = __cache_alloc(cachep, flags, __builtin_return_address(0)); |
3574 | ||
ca2b84cb EGM |
3575 | trace_kmem_cache_alloc(_RET_IP_, ret, |
3576 | obj_size(cachep), cachep->buffer_size, flags); | |
36555751 EGM |
3577 | |
3578 | return ret; | |
1da177e4 LT |
3579 | } |
3580 | EXPORT_SYMBOL(kmem_cache_alloc); | |
3581 | ||
0f24f128 | 3582 | #ifdef CONFIG_TRACING |
36555751 EGM |
3583 | void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags) |
3584 | { | |
3585 | return __cache_alloc(cachep, flags, __builtin_return_address(0)); | |
3586 | } | |
3587 | EXPORT_SYMBOL(kmem_cache_alloc_notrace); | |
3588 | #endif | |
3589 | ||
1da177e4 | 3590 | /** |
7682486b | 3591 | * kmem_ptr_validate - check if an untrusted pointer might be a slab entry. |
1da177e4 LT |
3592 | * @cachep: the cache we're checking against |
3593 | * @ptr: pointer to validate | |
3594 | * | |
7682486b | 3595 | * This verifies that the untrusted pointer looks sane; |
1da177e4 LT |
3596 | * it is _not_ a guarantee that the pointer is actually |
3597 | * part of the slab cache in question, but it at least | |
3598 | * validates that the pointer can be dereferenced and | |
3599 | * looks half-way sane. | |
3600 | * | |
3601 | * Currently only used for dentry validation. | |
3602 | */ | |
b7f869a2 | 3603 | int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr) |
1da177e4 | 3604 | { |
3dafccf2 | 3605 | unsigned long size = cachep->buffer_size; |
1da177e4 LT |
3606 | struct page *page; |
3607 | ||
fc1c1833 | 3608 | if (unlikely(!kern_ptr_validate(ptr, size))) |
1da177e4 LT |
3609 | goto out; |
3610 | page = virt_to_page(ptr); | |
3611 | if (unlikely(!PageSlab(page))) | |
3612 | goto out; | |
065d41cb | 3613 | if (unlikely(page_get_cache(page) != cachep)) |
1da177e4 LT |
3614 | goto out; |
3615 | return 1; | |
a737b3e2 | 3616 | out: |
1da177e4 LT |
3617 | return 0; |
3618 | } | |
3619 | ||
3620 | #ifdef CONFIG_NUMA | |
8b98c169 CH |
3621 | void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
3622 | { | |
36555751 EGM |
3623 | void *ret = __cache_alloc_node(cachep, flags, nodeid, |
3624 | __builtin_return_address(0)); | |
3625 | ||
ca2b84cb EGM |
3626 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
3627 | obj_size(cachep), cachep->buffer_size, | |
3628 | flags, nodeid); | |
36555751 EGM |
3629 | |
3630 | return ret; | |
8b98c169 | 3631 | } |
1da177e4 LT |
3632 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
3633 | ||
0f24f128 | 3634 | #ifdef CONFIG_TRACING |
36555751 EGM |
3635 | void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep, |
3636 | gfp_t flags, | |
3637 | int nodeid) | |
3638 | { | |
3639 | return __cache_alloc_node(cachep, flags, nodeid, | |
3640 | __builtin_return_address(0)); | |
3641 | } | |
3642 | EXPORT_SYMBOL(kmem_cache_alloc_node_notrace); | |
3643 | #endif | |
3644 | ||
8b98c169 CH |
3645 | static __always_inline void * |
3646 | __do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller) | |
97e2bde4 | 3647 | { |
343e0d7a | 3648 | struct kmem_cache *cachep; |
36555751 | 3649 | void *ret; |
97e2bde4 MS |
3650 | |
3651 | cachep = kmem_find_general_cachep(size, flags); | |
6cb8f913 CL |
3652 | if (unlikely(ZERO_OR_NULL_PTR(cachep))) |
3653 | return cachep; | |
36555751 EGM |
3654 | ret = kmem_cache_alloc_node_notrace(cachep, flags, node); |
3655 | ||
ca2b84cb EGM |
3656 | trace_kmalloc_node((unsigned long) caller, ret, |
3657 | size, cachep->buffer_size, flags, node); | |
36555751 EGM |
3658 | |
3659 | return ret; | |
97e2bde4 | 3660 | } |
8b98c169 | 3661 | |
0bb38a5c | 3662 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING) |
8b98c169 CH |
3663 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
3664 | { | |
3665 | return __do_kmalloc_node(size, flags, node, | |
3666 | __builtin_return_address(0)); | |
3667 | } | |
dbe5e69d | 3668 | EXPORT_SYMBOL(__kmalloc_node); |
8b98c169 CH |
3669 | |
3670 | void *__kmalloc_node_track_caller(size_t size, gfp_t flags, | |
ce71e27c | 3671 | int node, unsigned long caller) |
8b98c169 | 3672 | { |
ce71e27c | 3673 | return __do_kmalloc_node(size, flags, node, (void *)caller); |
8b98c169 CH |
3674 | } |
3675 | EXPORT_SYMBOL(__kmalloc_node_track_caller); | |
3676 | #else | |
3677 | void *__kmalloc_node(size_t size, gfp_t flags, int node) | |
3678 | { | |
3679 | return __do_kmalloc_node(size, flags, node, NULL); | |
3680 | } | |
3681 | EXPORT_SYMBOL(__kmalloc_node); | |
0bb38a5c | 3682 | #endif /* CONFIG_DEBUG_SLAB || CONFIG_TRACING */ |
8b98c169 | 3683 | #endif /* CONFIG_NUMA */ |
1da177e4 LT |
3684 | |
3685 | /** | |
800590f5 | 3686 | * __do_kmalloc - allocate memory |
1da177e4 | 3687 | * @size: how many bytes of memory are required. |
800590f5 | 3688 | * @flags: the type of memory to allocate (see kmalloc). |
911851e6 | 3689 | * @caller: function caller for debug tracking of the caller |
1da177e4 | 3690 | */ |
7fd6b141 PE |
3691 | static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, |
3692 | void *caller) | |
1da177e4 | 3693 | { |
343e0d7a | 3694 | struct kmem_cache *cachep; |
36555751 | 3695 | void *ret; |
1da177e4 | 3696 | |
97e2bde4 MS |
3697 | /* If you want to save a few bytes .text space: replace |
3698 | * __ with kmem_. | |
3699 | * Then kmalloc uses the uninlined functions instead of the inline | |
3700 | * functions. | |
3701 | */ | |
3702 | cachep = __find_general_cachep(size, flags); | |
a5c96d8a LT |
3703 | if (unlikely(ZERO_OR_NULL_PTR(cachep))) |
3704 | return cachep; | |
36555751 EGM |
3705 | ret = __cache_alloc(cachep, flags, caller); |
3706 | ||
ca2b84cb EGM |
3707 | trace_kmalloc((unsigned long) caller, ret, |
3708 | size, cachep->buffer_size, flags); | |
36555751 EGM |
3709 | |
3710 | return ret; | |
7fd6b141 PE |
3711 | } |
3712 | ||
7fd6b141 | 3713 | |
0bb38a5c | 3714 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING) |
7fd6b141 PE |
3715 | void *__kmalloc(size_t size, gfp_t flags) |
3716 | { | |
871751e2 | 3717 | return __do_kmalloc(size, flags, __builtin_return_address(0)); |
1da177e4 LT |
3718 | } |
3719 | EXPORT_SYMBOL(__kmalloc); | |
3720 | ||
ce71e27c | 3721 | void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller) |
7fd6b141 | 3722 | { |
ce71e27c | 3723 | return __do_kmalloc(size, flags, (void *)caller); |
7fd6b141 PE |
3724 | } |
3725 | EXPORT_SYMBOL(__kmalloc_track_caller); | |
1d2c8eea CH |
3726 | |
3727 | #else | |
3728 | void *__kmalloc(size_t size, gfp_t flags) | |
3729 | { | |
3730 | return __do_kmalloc(size, flags, NULL); | |
3731 | } | |
3732 | EXPORT_SYMBOL(__kmalloc); | |
7fd6b141 PE |
3733 | #endif |
3734 | ||
1da177e4 LT |
3735 | /** |
3736 | * kmem_cache_free - Deallocate an object | |
3737 | * @cachep: The cache the allocation was from. | |
3738 | * @objp: The previously allocated object. | |
3739 | * | |
3740 | * Free an object which was previously allocated from this | |
3741 | * cache. | |
3742 | */ | |
343e0d7a | 3743 | void kmem_cache_free(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
3744 | { |
3745 | unsigned long flags; | |
3746 | ||
3747 | local_irq_save(flags); | |
898552c9 | 3748 | debug_check_no_locks_freed(objp, obj_size(cachep)); |
3ac7fe5a TG |
3749 | if (!(cachep->flags & SLAB_DEBUG_OBJECTS)) |
3750 | debug_check_no_obj_freed(objp, obj_size(cachep)); | |
873623df | 3751 | __cache_free(cachep, objp); |
1da177e4 | 3752 | local_irq_restore(flags); |
36555751 | 3753 | |
ca2b84cb | 3754 | trace_kmem_cache_free(_RET_IP_, objp); |
1da177e4 LT |
3755 | } |
3756 | EXPORT_SYMBOL(kmem_cache_free); | |
3757 | ||
1da177e4 LT |
3758 | /** |
3759 | * kfree - free previously allocated memory | |
3760 | * @objp: pointer returned by kmalloc. | |
3761 | * | |
80e93eff PE |
3762 | * If @objp is NULL, no operation is performed. |
3763 | * | |
1da177e4 LT |
3764 | * Don't free memory not originally allocated by kmalloc() |
3765 | * or you will run into trouble. | |
3766 | */ | |
3767 | void kfree(const void *objp) | |
3768 | { | |
343e0d7a | 3769 | struct kmem_cache *c; |
1da177e4 LT |
3770 | unsigned long flags; |
3771 | ||
2121db74 PE |
3772 | trace_kfree(_RET_IP_, objp); |
3773 | ||
6cb8f913 | 3774 | if (unlikely(ZERO_OR_NULL_PTR(objp))) |
1da177e4 LT |
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)); |
3ac7fe5a | 3780 | debug_check_no_obj_freed(objp, obj_size(c)); |
873623df | 3781 | __cache_free(c, (void *)objp); |
1da177e4 LT |
3782 | local_irq_restore(flags); |
3783 | } | |
3784 | EXPORT_SYMBOL(kfree); | |
3785 | ||
343e0d7a | 3786 | unsigned int kmem_cache_size(struct kmem_cache *cachep) |
1da177e4 | 3787 | { |
3dafccf2 | 3788 | return obj_size(cachep); |
1da177e4 LT |
3789 | } |
3790 | EXPORT_SYMBOL(kmem_cache_size); | |
3791 | ||
343e0d7a | 3792 | const char *kmem_cache_name(struct kmem_cache *cachep) |
1944972d ACM |
3793 | { |
3794 | return cachep->name; | |
3795 | } | |
3796 | EXPORT_SYMBOL_GPL(kmem_cache_name); | |
3797 | ||
e498be7d | 3798 | /* |
183ff22b | 3799 | * This initializes kmem_list3 or resizes various caches for all nodes. |
e498be7d | 3800 | */ |
83b519e8 | 3801 | static int alloc_kmemlist(struct kmem_cache *cachep, gfp_t gfp) |
e498be7d CL |
3802 | { |
3803 | int node; | |
3804 | struct kmem_list3 *l3; | |
cafeb02e | 3805 | struct array_cache *new_shared; |
3395ee05 | 3806 | struct array_cache **new_alien = NULL; |
e498be7d | 3807 | |
9c09a95c | 3808 | for_each_online_node(node) { |
cafeb02e | 3809 | |
3395ee05 | 3810 | if (use_alien_caches) { |
83b519e8 | 3811 | new_alien = alloc_alien_cache(node, cachep->limit, gfp); |
3395ee05 PM |
3812 | if (!new_alien) |
3813 | goto fail; | |
3814 | } | |
cafeb02e | 3815 | |
63109846 ED |
3816 | new_shared = NULL; |
3817 | if (cachep->shared) { | |
3818 | new_shared = alloc_arraycache(node, | |
0718dc2a | 3819 | cachep->shared*cachep->batchcount, |
83b519e8 | 3820 | 0xbaadf00d, gfp); |
63109846 ED |
3821 | if (!new_shared) { |
3822 | free_alien_cache(new_alien); | |
3823 | goto fail; | |
3824 | } | |
0718dc2a | 3825 | } |
cafeb02e | 3826 | |
a737b3e2 AM |
3827 | l3 = cachep->nodelists[node]; |
3828 | if (l3) { | |
cafeb02e CL |
3829 | struct array_cache *shared = l3->shared; |
3830 | ||
e498be7d CL |
3831 | spin_lock_irq(&l3->list_lock); |
3832 | ||
cafeb02e | 3833 | if (shared) |
0718dc2a CL |
3834 | free_block(cachep, shared->entry, |
3835 | shared->avail, node); | |
e498be7d | 3836 | |
cafeb02e CL |
3837 | l3->shared = new_shared; |
3838 | if (!l3->alien) { | |
e498be7d CL |
3839 | l3->alien = new_alien; |
3840 | new_alien = NULL; | |
3841 | } | |
b28a02de | 3842 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 3843 | cachep->batchcount + cachep->num; |
e498be7d | 3844 | spin_unlock_irq(&l3->list_lock); |
cafeb02e | 3845 | kfree(shared); |
e498be7d CL |
3846 | free_alien_cache(new_alien); |
3847 | continue; | |
3848 | } | |
83b519e8 | 3849 | l3 = kmalloc_node(sizeof(struct kmem_list3), gfp, node); |
0718dc2a CL |
3850 | if (!l3) { |
3851 | free_alien_cache(new_alien); | |
3852 | kfree(new_shared); | |
e498be7d | 3853 | goto fail; |
0718dc2a | 3854 | } |
e498be7d CL |
3855 | |
3856 | kmem_list3_init(l3); | |
3857 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
a737b3e2 | 3858 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
cafeb02e | 3859 | l3->shared = new_shared; |
e498be7d | 3860 | l3->alien = new_alien; |
b28a02de | 3861 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 3862 | cachep->batchcount + cachep->num; |
e498be7d CL |
3863 | cachep->nodelists[node] = l3; |
3864 | } | |
cafeb02e | 3865 | return 0; |
0718dc2a | 3866 | |
a737b3e2 | 3867 | fail: |
0718dc2a CL |
3868 | if (!cachep->next.next) { |
3869 | /* Cache is not active yet. Roll back what we did */ | |
3870 | node--; | |
3871 | while (node >= 0) { | |
3872 | if (cachep->nodelists[node]) { | |
3873 | l3 = cachep->nodelists[node]; | |
3874 | ||
3875 | kfree(l3->shared); | |
3876 | free_alien_cache(l3->alien); | |
3877 | kfree(l3); | |
3878 | cachep->nodelists[node] = NULL; | |
3879 | } | |
3880 | node--; | |
3881 | } | |
3882 | } | |
cafeb02e | 3883 | return -ENOMEM; |
e498be7d CL |
3884 | } |
3885 | ||
1da177e4 | 3886 | struct ccupdate_struct { |
343e0d7a | 3887 | struct kmem_cache *cachep; |
1da177e4 LT |
3888 | struct array_cache *new[NR_CPUS]; |
3889 | }; | |
3890 | ||
3891 | static void do_ccupdate_local(void *info) | |
3892 | { | |
a737b3e2 | 3893 | struct ccupdate_struct *new = info; |
1da177e4 LT |
3894 | struct array_cache *old; |
3895 | ||
3896 | check_irq_off(); | |
9a2dba4b | 3897 | old = cpu_cache_get(new->cachep); |
e498be7d | 3898 | |
1da177e4 LT |
3899 | new->cachep->array[smp_processor_id()] = new->new[smp_processor_id()]; |
3900 | new->new[smp_processor_id()] = old; | |
3901 | } | |
3902 | ||
b5d8ca7c | 3903 | /* Always called with the cache_chain_mutex held */ |
a737b3e2 | 3904 | static int do_tune_cpucache(struct kmem_cache *cachep, int limit, |
83b519e8 | 3905 | int batchcount, int shared, gfp_t gfp) |
1da177e4 | 3906 | { |
d2e7b7d0 | 3907 | struct ccupdate_struct *new; |
2ed3a4ef | 3908 | int i; |
1da177e4 | 3909 | |
83b519e8 | 3910 | new = kzalloc(sizeof(*new), gfp); |
d2e7b7d0 SS |
3911 | if (!new) |
3912 | return -ENOMEM; | |
3913 | ||
e498be7d | 3914 | for_each_online_cpu(i) { |
d2e7b7d0 | 3915 | new->new[i] = alloc_arraycache(cpu_to_node(i), limit, |
83b519e8 | 3916 | batchcount, gfp); |
d2e7b7d0 | 3917 | if (!new->new[i]) { |
b28a02de | 3918 | for (i--; i >= 0; i--) |
d2e7b7d0 SS |
3919 | kfree(new->new[i]); |
3920 | kfree(new); | |
e498be7d | 3921 | return -ENOMEM; |
1da177e4 LT |
3922 | } |
3923 | } | |
d2e7b7d0 | 3924 | new->cachep = cachep; |
1da177e4 | 3925 | |
15c8b6c1 | 3926 | on_each_cpu(do_ccupdate_local, (void *)new, 1); |
e498be7d | 3927 | |
1da177e4 | 3928 | check_irq_on(); |
1da177e4 LT |
3929 | cachep->batchcount = batchcount; |
3930 | cachep->limit = limit; | |
e498be7d | 3931 | cachep->shared = shared; |
1da177e4 | 3932 | |
e498be7d | 3933 | for_each_online_cpu(i) { |
d2e7b7d0 | 3934 | struct array_cache *ccold = new->new[i]; |
1da177e4 LT |
3935 | if (!ccold) |
3936 | continue; | |
e498be7d | 3937 | spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
ff69416e | 3938 | free_block(cachep, ccold->entry, ccold->avail, cpu_to_node(i)); |
e498be7d | 3939 | spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); |
1da177e4 LT |
3940 | kfree(ccold); |
3941 | } | |
d2e7b7d0 | 3942 | kfree(new); |
83b519e8 | 3943 | return alloc_kmemlist(cachep, gfp); |
1da177e4 LT |
3944 | } |
3945 | ||
b5d8ca7c | 3946 | /* Called with cache_chain_mutex held always */ |
83b519e8 | 3947 | static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp) |
1da177e4 LT |
3948 | { |
3949 | int err; | |
3950 | int limit, shared; | |
3951 | ||
a737b3e2 AM |
3952 | /* |
3953 | * The head array serves three purposes: | |
1da177e4 LT |
3954 | * - create a LIFO ordering, i.e. return objects that are cache-warm |
3955 | * - reduce the number of spinlock operations. | |
a737b3e2 | 3956 | * - reduce the number of linked list operations on the slab and |
1da177e4 LT |
3957 | * bufctl chains: array operations are cheaper. |
3958 | * The numbers are guessed, we should auto-tune as described by | |
3959 | * Bonwick. | |
3960 | */ | |
3dafccf2 | 3961 | if (cachep->buffer_size > 131072) |
1da177e4 | 3962 | limit = 1; |
3dafccf2 | 3963 | else if (cachep->buffer_size > PAGE_SIZE) |
1da177e4 | 3964 | limit = 8; |
3dafccf2 | 3965 | else if (cachep->buffer_size > 1024) |
1da177e4 | 3966 | limit = 24; |
3dafccf2 | 3967 | else if (cachep->buffer_size > 256) |
1da177e4 LT |
3968 | limit = 54; |
3969 | else | |
3970 | limit = 120; | |
3971 | ||
a737b3e2 AM |
3972 | /* |
3973 | * CPU bound tasks (e.g. network routing) can exhibit cpu bound | |
1da177e4 LT |
3974 | * allocation behaviour: Most allocs on one cpu, most free operations |
3975 | * on another cpu. For these cases, an efficient object passing between | |
3976 | * cpus is necessary. This is provided by a shared array. The array | |
3977 | * replaces Bonwick's magazine layer. | |
3978 | * On uniprocessor, it's functionally equivalent (but less efficient) | |
3979 | * to a larger limit. Thus disabled by default. | |
3980 | */ | |
3981 | shared = 0; | |
364fbb29 | 3982 | if (cachep->buffer_size <= PAGE_SIZE && num_possible_cpus() > 1) |
1da177e4 | 3983 | shared = 8; |
1da177e4 LT |
3984 | |
3985 | #if DEBUG | |
a737b3e2 AM |
3986 | /* |
3987 | * With debugging enabled, large batchcount lead to excessively long | |
3988 | * periods with disabled local interrupts. Limit the batchcount | |
1da177e4 LT |
3989 | */ |
3990 | if (limit > 32) | |
3991 | limit = 32; | |
3992 | #endif | |
83b519e8 | 3993 | err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared, gfp); |
1da177e4 LT |
3994 | if (err) |
3995 | printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n", | |
b28a02de | 3996 | cachep->name, -err); |
2ed3a4ef | 3997 | return err; |
1da177e4 LT |
3998 | } |
3999 | ||
1b55253a CL |
4000 | /* |
4001 | * Drain an array if it contains any elements taking the l3 lock only if | |
b18e7e65 CL |
4002 | * necessary. Note that the l3 listlock also protects the array_cache |
4003 | * if drain_array() is used on the shared array. | |
1b55253a CL |
4004 | */ |
4005 | void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, | |
4006 | struct array_cache *ac, int force, int node) | |
1da177e4 LT |
4007 | { |
4008 | int tofree; | |
4009 | ||
1b55253a CL |
4010 | if (!ac || !ac->avail) |
4011 | return; | |
1da177e4 LT |
4012 | if (ac->touched && !force) { |
4013 | ac->touched = 0; | |
b18e7e65 | 4014 | } else { |
1b55253a | 4015 | spin_lock_irq(&l3->list_lock); |
b18e7e65 CL |
4016 | if (ac->avail) { |
4017 | tofree = force ? ac->avail : (ac->limit + 4) / 5; | |
4018 | if (tofree > ac->avail) | |
4019 | tofree = (ac->avail + 1) / 2; | |
4020 | free_block(cachep, ac->entry, tofree, node); | |
4021 | ac->avail -= tofree; | |
4022 | memmove(ac->entry, &(ac->entry[tofree]), | |
4023 | sizeof(void *) * ac->avail); | |
4024 | } | |
1b55253a | 4025 | spin_unlock_irq(&l3->list_lock); |
1da177e4 LT |
4026 | } |
4027 | } | |
4028 | ||
4029 | /** | |
4030 | * cache_reap - Reclaim memory from caches. | |
05fb6bf0 | 4031 | * @w: work descriptor |
1da177e4 LT |
4032 | * |
4033 | * Called from workqueue/eventd every few seconds. | |
4034 | * Purpose: | |
4035 | * - clear the per-cpu caches for this CPU. | |
4036 | * - return freeable pages to the main free memory pool. | |
4037 | * | |
a737b3e2 AM |
4038 | * If we cannot acquire the cache chain mutex then just give up - we'll try |
4039 | * again on the next iteration. | |
1da177e4 | 4040 | */ |
7c5cae36 | 4041 | static void cache_reap(struct work_struct *w) |
1da177e4 | 4042 | { |
7a7c381d | 4043 | struct kmem_cache *searchp; |
e498be7d | 4044 | struct kmem_list3 *l3; |
aab2207c | 4045 | int node = numa_node_id(); |
bf6aede7 | 4046 | struct delayed_work *work = to_delayed_work(w); |
1da177e4 | 4047 | |
7c5cae36 | 4048 | if (!mutex_trylock(&cache_chain_mutex)) |
1da177e4 | 4049 | /* Give up. Setup the next iteration. */ |
7c5cae36 | 4050 | goto out; |
1da177e4 | 4051 | |
7a7c381d | 4052 | list_for_each_entry(searchp, &cache_chain, next) { |
1da177e4 LT |
4053 | check_irq_on(); |
4054 | ||
35386e3b CL |
4055 | /* |
4056 | * We only take the l3 lock if absolutely necessary and we | |
4057 | * have established with reasonable certainty that | |
4058 | * we can do some work if the lock was obtained. | |
4059 | */ | |
aab2207c | 4060 | l3 = searchp->nodelists[node]; |
35386e3b | 4061 | |
8fce4d8e | 4062 | reap_alien(searchp, l3); |
1da177e4 | 4063 | |
aab2207c | 4064 | drain_array(searchp, l3, cpu_cache_get(searchp), 0, node); |
1da177e4 | 4065 | |
35386e3b CL |
4066 | /* |
4067 | * These are racy checks but it does not matter | |
4068 | * if we skip one check or scan twice. | |
4069 | */ | |
e498be7d | 4070 | if (time_after(l3->next_reap, jiffies)) |
35386e3b | 4071 | goto next; |
1da177e4 | 4072 | |
e498be7d | 4073 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3; |
1da177e4 | 4074 | |
aab2207c | 4075 | drain_array(searchp, l3, l3->shared, 0, node); |
1da177e4 | 4076 | |
ed11d9eb | 4077 | if (l3->free_touched) |
e498be7d | 4078 | l3->free_touched = 0; |
ed11d9eb CL |
4079 | else { |
4080 | int freed; | |
1da177e4 | 4081 | |
ed11d9eb CL |
4082 | freed = drain_freelist(searchp, l3, (l3->free_limit + |
4083 | 5 * searchp->num - 1) / (5 * searchp->num)); | |
4084 | STATS_ADD_REAPED(searchp, freed); | |
4085 | } | |
35386e3b | 4086 | next: |
1da177e4 LT |
4087 | cond_resched(); |
4088 | } | |
4089 | check_irq_on(); | |
fc0abb14 | 4090 | mutex_unlock(&cache_chain_mutex); |
8fce4d8e | 4091 | next_reap_node(); |
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 | ||
158a9624 | 4097 | #ifdef CONFIG_SLABINFO |
1da177e4 | 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; | |
85289f98 | 4125 | |
fc0abb14 | 4126 | mutex_lock(&cache_chain_mutex); |
85289f98 PE |
4127 | if (!n) |
4128 | print_slabinfo_header(m); | |
b92151ba PE |
4129 | |
4130 | return seq_list_start(&cache_chain, *pos); | |
1da177e4 LT |
4131 | } |
4132 | ||
4133 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) | |
4134 | { | |
b92151ba | 4135 | return seq_list_next(p, &cache_chain, pos); |
1da177e4 LT |
4136 | } |
4137 | ||
4138 | static void s_stop(struct seq_file *m, void *p) | |
4139 | { | |
fc0abb14 | 4140 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
4141 | } |
4142 | ||
4143 | static int s_show(struct seq_file *m, void *p) | |
4144 | { | |
b92151ba | 4145 | struct kmem_cache *cachep = list_entry(p, struct kmem_cache, next); |
b28a02de PE |
4146 | struct slab *slabp; |
4147 | unsigned long active_objs; | |
4148 | unsigned long num_objs; | |
4149 | unsigned long active_slabs = 0; | |
4150 | unsigned long num_slabs, free_objects = 0, shared_avail = 0; | |
e498be7d | 4151 | const char *name; |
1da177e4 | 4152 | char *error = NULL; |
e498be7d CL |
4153 | int node; |
4154 | struct kmem_list3 *l3; | |
1da177e4 | 4155 | |
1da177e4 LT |
4156 | active_objs = 0; |
4157 | num_slabs = 0; | |
e498be7d CL |
4158 | for_each_online_node(node) { |
4159 | l3 = cachep->nodelists[node]; | |
4160 | if (!l3) | |
4161 | continue; | |
4162 | ||
ca3b9b91 RT |
4163 | check_irq_on(); |
4164 | spin_lock_irq(&l3->list_lock); | |
e498be7d | 4165 | |
7a7c381d | 4166 | list_for_each_entry(slabp, &l3->slabs_full, list) { |
e498be7d CL |
4167 | if (slabp->inuse != cachep->num && !error) |
4168 | error = "slabs_full accounting error"; | |
4169 | active_objs += cachep->num; | |
4170 | active_slabs++; | |
4171 | } | |
7a7c381d | 4172 | list_for_each_entry(slabp, &l3->slabs_partial, list) { |
e498be7d CL |
4173 | if (slabp->inuse == cachep->num && !error) |
4174 | error = "slabs_partial inuse accounting error"; | |
4175 | if (!slabp->inuse && !error) | |
4176 | error = "slabs_partial/inuse accounting error"; | |
4177 | active_objs += slabp->inuse; | |
4178 | active_slabs++; | |
4179 | } | |
7a7c381d | 4180 | list_for_each_entry(slabp, &l3->slabs_free, list) { |
e498be7d CL |
4181 | if (slabp->inuse && !error) |
4182 | error = "slabs_free/inuse accounting error"; | |
4183 | num_slabs++; | |
4184 | } | |
4185 | free_objects += l3->free_objects; | |
4484ebf1 RT |
4186 | if (l3->shared) |
4187 | shared_avail += l3->shared->avail; | |
e498be7d | 4188 | |
ca3b9b91 | 4189 | spin_unlock_irq(&l3->list_lock); |
1da177e4 | 4190 | } |
b28a02de PE |
4191 | num_slabs += active_slabs; |
4192 | num_objs = num_slabs * cachep->num; | |
e498be7d | 4193 | if (num_objs - active_objs != free_objects && !error) |
1da177e4 LT |
4194 | error = "free_objects accounting error"; |
4195 | ||
b28a02de | 4196 | name = cachep->name; |
1da177e4 LT |
4197 | if (error) |
4198 | printk(KERN_ERR "slab: cache %s error: %s\n", name, error); | |
4199 | ||
4200 | seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", | |
3dafccf2 | 4201 | name, active_objs, num_objs, cachep->buffer_size, |
b28a02de | 4202 | cachep->num, (1 << cachep->gfporder)); |
1da177e4 | 4203 | seq_printf(m, " : tunables %4u %4u %4u", |
b28a02de | 4204 | cachep->limit, cachep->batchcount, cachep->shared); |
e498be7d | 4205 | seq_printf(m, " : slabdata %6lu %6lu %6lu", |
b28a02de | 4206 | active_slabs, num_slabs, shared_avail); |
1da177e4 | 4207 | #if STATS |
b28a02de | 4208 | { /* list3 stats */ |
1da177e4 LT |
4209 | unsigned long high = cachep->high_mark; |
4210 | unsigned long allocs = cachep->num_allocations; | |
4211 | unsigned long grown = cachep->grown; | |
4212 | unsigned long reaped = cachep->reaped; | |
4213 | unsigned long errors = cachep->errors; | |
4214 | unsigned long max_freeable = cachep->max_freeable; | |
1da177e4 | 4215 | unsigned long node_allocs = cachep->node_allocs; |
e498be7d | 4216 | unsigned long node_frees = cachep->node_frees; |
fb7faf33 | 4217 | unsigned long overflows = cachep->node_overflow; |
1da177e4 | 4218 | |
e498be7d | 4219 | seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \ |
fb7faf33 | 4220 | %4lu %4lu %4lu %4lu %4lu", allocs, high, grown, |
a737b3e2 | 4221 | reaped, errors, max_freeable, node_allocs, |
fb7faf33 | 4222 | node_frees, overflows); |
1da177e4 LT |
4223 | } |
4224 | /* cpu stats */ | |
4225 | { | |
4226 | unsigned long allochit = atomic_read(&cachep->allochit); | |
4227 | unsigned long allocmiss = atomic_read(&cachep->allocmiss); | |
4228 | unsigned long freehit = atomic_read(&cachep->freehit); | |
4229 | unsigned long freemiss = atomic_read(&cachep->freemiss); | |
4230 | ||
4231 | seq_printf(m, " : cpustat %6lu %6lu %6lu %6lu", | |
b28a02de | 4232 | allochit, allocmiss, freehit, freemiss); |
1da177e4 LT |
4233 | } |
4234 | #endif | |
4235 | seq_putc(m, '\n'); | |
1da177e4 LT |
4236 | return 0; |
4237 | } | |
4238 | ||
4239 | /* | |
4240 | * slabinfo_op - iterator that generates /proc/slabinfo | |
4241 | * | |
4242 | * Output layout: | |
4243 | * cache-name | |
4244 | * num-active-objs | |
4245 | * total-objs | |
4246 | * object size | |
4247 | * num-active-slabs | |
4248 | * total-slabs | |
4249 | * num-pages-per-slab | |
4250 | * + further values on SMP and with statistics enabled | |
4251 | */ | |
4252 | ||
7b3c3a50 | 4253 | static const struct seq_operations slabinfo_op = { |
b28a02de PE |
4254 | .start = s_start, |
4255 | .next = s_next, | |
4256 | .stop = s_stop, | |
4257 | .show = s_show, | |
1da177e4 LT |
4258 | }; |
4259 | ||
4260 | #define MAX_SLABINFO_WRITE 128 | |
4261 | /** | |
4262 | * slabinfo_write - Tuning for the slab allocator | |
4263 | * @file: unused | |
4264 | * @buffer: user buffer | |
4265 | * @count: data length | |
4266 | * @ppos: unused | |
4267 | */ | |
b28a02de PE |
4268 | ssize_t slabinfo_write(struct file *file, const char __user * buffer, |
4269 | size_t count, loff_t *ppos) | |
1da177e4 | 4270 | { |
b28a02de | 4271 | char kbuf[MAX_SLABINFO_WRITE + 1], *tmp; |
1da177e4 | 4272 | int limit, batchcount, shared, res; |
7a7c381d | 4273 | struct kmem_cache *cachep; |
b28a02de | 4274 | |
1da177e4 LT |
4275 | if (count > MAX_SLABINFO_WRITE) |
4276 | return -EINVAL; | |
4277 | if (copy_from_user(&kbuf, buffer, count)) | |
4278 | return -EFAULT; | |
b28a02de | 4279 | kbuf[MAX_SLABINFO_WRITE] = '\0'; |
1da177e4 LT |
4280 | |
4281 | tmp = strchr(kbuf, ' '); | |
4282 | if (!tmp) | |
4283 | return -EINVAL; | |
4284 | *tmp = '\0'; | |
4285 | tmp++; | |
4286 | if (sscanf(tmp, " %d %d %d", &limit, &batchcount, &shared) != 3) | |
4287 | return -EINVAL; | |
4288 | ||
4289 | /* Find the cache in the chain of caches. */ | |
fc0abb14 | 4290 | mutex_lock(&cache_chain_mutex); |
1da177e4 | 4291 | res = -EINVAL; |
7a7c381d | 4292 | list_for_each_entry(cachep, &cache_chain, next) { |
1da177e4 | 4293 | if (!strcmp(cachep->name, kbuf)) { |
a737b3e2 AM |
4294 | if (limit < 1 || batchcount < 1 || |
4295 | batchcount > limit || shared < 0) { | |
e498be7d | 4296 | res = 0; |
1da177e4 | 4297 | } else { |
e498be7d | 4298 | res = do_tune_cpucache(cachep, limit, |
83b519e8 PE |
4299 | batchcount, shared, |
4300 | GFP_KERNEL); | |
1da177e4 LT |
4301 | } |
4302 | break; | |
4303 | } | |
4304 | } | |
fc0abb14 | 4305 | mutex_unlock(&cache_chain_mutex); |
1da177e4 LT |
4306 | if (res >= 0) |
4307 | res = count; | |
4308 | return res; | |
4309 | } | |
871751e2 | 4310 | |
7b3c3a50 AD |
4311 | static int slabinfo_open(struct inode *inode, struct file *file) |
4312 | { | |
4313 | return seq_open(file, &slabinfo_op); | |
4314 | } | |
4315 | ||
4316 | static const struct file_operations proc_slabinfo_operations = { | |
4317 | .open = slabinfo_open, | |
4318 | .read = seq_read, | |
4319 | .write = slabinfo_write, | |
4320 | .llseek = seq_lseek, | |
4321 | .release = seq_release, | |
4322 | }; | |
4323 | ||
871751e2 AV |
4324 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
4325 | ||
4326 | static void *leaks_start(struct seq_file *m, loff_t *pos) | |
4327 | { | |
871751e2 | 4328 | mutex_lock(&cache_chain_mutex); |
b92151ba | 4329 | return seq_list_start(&cache_chain, *pos); |
871751e2 AV |
4330 | } |
4331 | ||
4332 | static inline int add_caller(unsigned long *n, unsigned long v) | |
4333 | { | |
4334 | unsigned long *p; | |
4335 | int l; | |
4336 | if (!v) | |
4337 | return 1; | |
4338 | l = n[1]; | |
4339 | p = n + 2; | |
4340 | while (l) { | |
4341 | int i = l/2; | |
4342 | unsigned long *q = p + 2 * i; | |
4343 | if (*q == v) { | |
4344 | q[1]++; | |
4345 | return 1; | |
4346 | } | |
4347 | if (*q > v) { | |
4348 | l = i; | |
4349 | } else { | |
4350 | p = q + 2; | |
4351 | l -= i + 1; | |
4352 | } | |
4353 | } | |
4354 | if (++n[1] == n[0]) | |
4355 | return 0; | |
4356 | memmove(p + 2, p, n[1] * 2 * sizeof(unsigned long) - ((void *)p - (void *)n)); | |
4357 | p[0] = v; | |
4358 | p[1] = 1; | |
4359 | return 1; | |
4360 | } | |
4361 | ||
4362 | static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s) | |
4363 | { | |
4364 | void *p; | |
4365 | int i; | |
4366 | if (n[0] == n[1]) | |
4367 | return; | |
4368 | for (i = 0, p = s->s_mem; i < c->num; i++, p += c->buffer_size) { | |
4369 | if (slab_bufctl(s)[i] != BUFCTL_ACTIVE) | |
4370 | continue; | |
4371 | if (!add_caller(n, (unsigned long)*dbg_userword(c, p))) | |
4372 | return; | |
4373 | } | |
4374 | } | |
4375 | ||
4376 | static void show_symbol(struct seq_file *m, unsigned long address) | |
4377 | { | |
4378 | #ifdef CONFIG_KALLSYMS | |
871751e2 | 4379 | unsigned long offset, size; |
9281acea | 4380 | char modname[MODULE_NAME_LEN], name[KSYM_NAME_LEN]; |
871751e2 | 4381 | |
a5c43dae | 4382 | if (lookup_symbol_attrs(address, &size, &offset, modname, name) == 0) { |
871751e2 | 4383 | seq_printf(m, "%s+%#lx/%#lx", name, offset, size); |
a5c43dae | 4384 | if (modname[0]) |
871751e2 AV |
4385 | seq_printf(m, " [%s]", modname); |
4386 | return; | |
4387 | } | |
4388 | #endif | |
4389 | seq_printf(m, "%p", (void *)address); | |
4390 | } | |
4391 | ||
4392 | static int leaks_show(struct seq_file *m, void *p) | |
4393 | { | |
b92151ba | 4394 | struct kmem_cache *cachep = list_entry(p, struct kmem_cache, next); |
871751e2 AV |
4395 | struct slab *slabp; |
4396 | struct kmem_list3 *l3; | |
4397 | const char *name; | |
4398 | unsigned long *n = m->private; | |
4399 | int node; | |
4400 | int i; | |
4401 | ||
4402 | if (!(cachep->flags & SLAB_STORE_USER)) | |
4403 | return 0; | |
4404 | if (!(cachep->flags & SLAB_RED_ZONE)) | |
4405 | return 0; | |
4406 | ||
4407 | /* OK, we can do it */ | |
4408 | ||
4409 | n[1] = 0; | |
4410 | ||
4411 | for_each_online_node(node) { | |
4412 | l3 = cachep->nodelists[node]; | |
4413 | if (!l3) | |
4414 | continue; | |
4415 | ||
4416 | check_irq_on(); | |
4417 | spin_lock_irq(&l3->list_lock); | |
4418 | ||
7a7c381d | 4419 | list_for_each_entry(slabp, &l3->slabs_full, list) |
871751e2 | 4420 | handle_slab(n, cachep, slabp); |
7a7c381d | 4421 | list_for_each_entry(slabp, &l3->slabs_partial, list) |
871751e2 | 4422 | handle_slab(n, cachep, slabp); |
871751e2 AV |
4423 | spin_unlock_irq(&l3->list_lock); |
4424 | } | |
4425 | name = cachep->name; | |
4426 | if (n[0] == n[1]) { | |
4427 | /* Increase the buffer size */ | |
4428 | mutex_unlock(&cache_chain_mutex); | |
4429 | m->private = kzalloc(n[0] * 4 * sizeof(unsigned long), GFP_KERNEL); | |
4430 | if (!m->private) { | |
4431 | /* Too bad, we are really out */ | |
4432 | m->private = n; | |
4433 | mutex_lock(&cache_chain_mutex); | |
4434 | return -ENOMEM; | |
4435 | } | |
4436 | *(unsigned long *)m->private = n[0] * 2; | |
4437 | kfree(n); | |
4438 | mutex_lock(&cache_chain_mutex); | |
4439 | /* Now make sure this entry will be retried */ | |
4440 | m->count = m->size; | |
4441 | return 0; | |
4442 | } | |
4443 | for (i = 0; i < n[1]; i++) { | |
4444 | seq_printf(m, "%s: %lu ", name, n[2*i+3]); | |
4445 | show_symbol(m, n[2*i+2]); | |
4446 | seq_putc(m, '\n'); | |
4447 | } | |
d2e7b7d0 | 4448 | |
871751e2 AV |
4449 | return 0; |
4450 | } | |
4451 | ||
a0ec95a8 | 4452 | static const struct seq_operations slabstats_op = { |
871751e2 AV |
4453 | .start = leaks_start, |
4454 | .next = s_next, | |
4455 | .stop = s_stop, | |
4456 | .show = leaks_show, | |
4457 | }; | |
a0ec95a8 AD |
4458 | |
4459 | static int slabstats_open(struct inode *inode, struct file *file) | |
4460 | { | |
4461 | unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
4462 | int ret = -ENOMEM; | |
4463 | if (n) { | |
4464 | ret = seq_open(file, &slabstats_op); | |
4465 | if (!ret) { | |
4466 | struct seq_file *m = file->private_data; | |
4467 | *n = PAGE_SIZE / (2 * sizeof(unsigned long)); | |
4468 | m->private = n; | |
4469 | n = NULL; | |
4470 | } | |
4471 | kfree(n); | |
4472 | } | |
4473 | return ret; | |
4474 | } | |
4475 | ||
4476 | static const struct file_operations proc_slabstats_operations = { | |
4477 | .open = slabstats_open, | |
4478 | .read = seq_read, | |
4479 | .llseek = seq_lseek, | |
4480 | .release = seq_release_private, | |
4481 | }; | |
4482 | #endif | |
4483 | ||
4484 | static int __init slab_proc_init(void) | |
4485 | { | |
7b3c3a50 | 4486 | proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations); |
a0ec95a8 AD |
4487 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
4488 | proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations); | |
871751e2 | 4489 | #endif |
a0ec95a8 AD |
4490 | return 0; |
4491 | } | |
4492 | module_init(slab_proc_init); | |
1da177e4 LT |
4493 | #endif |
4494 | ||
00e145b6 MS |
4495 | /** |
4496 | * ksize - get the actual amount of memory allocated for a given object | |
4497 | * @objp: Pointer to the object | |
4498 | * | |
4499 | * kmalloc may internally round up allocations and return more memory | |
4500 | * than requested. ksize() can be used to determine the actual amount of | |
4501 | * memory allocated. The caller may use this additional memory, even though | |
4502 | * a smaller amount of memory was initially specified with the kmalloc call. | |
4503 | * The caller must guarantee that objp points to a valid object previously | |
4504 | * allocated with either kmalloc() or kmem_cache_alloc(). The object | |
4505 | * must not be freed during the duration of the call. | |
4506 | */ | |
fd76bab2 | 4507 | size_t ksize(const void *objp) |
1da177e4 | 4508 | { |
ef8b4520 CL |
4509 | BUG_ON(!objp); |
4510 | if (unlikely(objp == ZERO_SIZE_PTR)) | |
00e145b6 | 4511 | return 0; |
1da177e4 | 4512 | |
6ed5eb22 | 4513 | return obj_size(virt_to_cache(objp)); |
1da177e4 | 4514 | } |
b1aabecd | 4515 | EXPORT_SYMBOL(ksize); |