2 * linux/include/linux/slab.h
3 * Written by Mark Hemment, 1996.
4 * (markhe@nextd.demon.co.uk)
10 #if defined(__KERNEL__)
12 typedef struct kmem_cache kmem_cache_t;
14 #include <linux/gfp.h>
15 #include <linux/init.h>
16 #include <linux/types.h>
17 #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
18 #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
20 /* flags for kmem_cache_alloc() */
21 #define SLAB_NOFS GFP_NOFS
22 #define SLAB_NOIO GFP_NOIO
23 #define SLAB_ATOMIC GFP_ATOMIC
24 #define SLAB_USER GFP_USER
25 #define SLAB_KERNEL GFP_KERNEL
26 #define SLAB_DMA GFP_DMA
28 #define SLAB_LEVEL_MASK GFP_LEVEL_MASK
30 #define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */
32 /* flags to pass to kmem_cache_create().
33 * The first 3 are only valid when the allocator as been build
36 #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
37 #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
38 #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
39 #define SLAB_POISON 0x00000800UL /* Poison objects */
40 #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
41 #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
42 #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
43 #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
44 #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
45 what is reclaimable later*/
46 #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
47 #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
48 #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
50 /* flags passed to a constructor func */
51 #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
52 #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
53 #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
58 extern void __init kmem_cache_init(void);
60 extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
61 void (*)(void *, kmem_cache_t *, unsigned long),
62 void (*)(void *, kmem_cache_t *, unsigned long));
63 extern void kmem_cache_destroy(kmem_cache_t *);
64 extern int kmem_cache_shrink(kmem_cache_t *);
65 extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
66 extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
67 extern void kmem_cache_free(kmem_cache_t *, void *);
68 extern unsigned int kmem_cache_size(kmem_cache_t *);
69 extern const char *kmem_cache_name(kmem_cache_t *);
71 /* Size description struct for general caches. */
74 kmem_cache_t *cs_cachep;
75 kmem_cache_t *cs_dmacachep;
77 extern struct cache_sizes malloc_sizes[];
79 extern void *__kmalloc(size_t, gfp_t);
82 * kmalloc - allocate memory
83 * @size: how many bytes of memory are required.
84 * @flags: the type of memory to allocate.
86 * kmalloc is the normal method of allocating memory
89 * The @flags argument may be one of:
91 * %GFP_USER - Allocate memory on behalf of user. May sleep.
93 * %GFP_KERNEL - Allocate normal kernel ram. May sleep.
95 * %GFP_ATOMIC - Allocation will not sleep.
96 * For example, use this inside interrupt handlers.
98 * %GFP_HIGHUSER - Allocate pages from high memory.
100 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
102 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
104 * Also it is possible to set different flags by OR'ing
105 * in one or more of the following additional @flags:
107 * %__GFP_COLD - Request cache-cold pages instead of
108 * trying to return cache-warm pages.
110 * %__GFP_DMA - Request memory from the DMA-capable zone.
112 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
114 * %__GFP_HIGHMEM - Allocated memory may be from highmem.
116 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
117 * (think twice before using).
119 * %__GFP_NORETRY - If memory is not immediately available,
120 * then give up at once.
122 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
124 * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
126 static inline void *kmalloc(size_t size, gfp_t flags)
128 if (__builtin_constant_p(size)) {
135 #include "kmalloc_sizes.h"
138 extern void __you_cannot_kmalloc_that_much(void);
139 __you_cannot_kmalloc_that_much();
142 return kmem_cache_alloc((flags & GFP_DMA) ?
143 malloc_sizes[i].cs_dmacachep :
144 malloc_sizes[i].cs_cachep, flags);
146 return __kmalloc(size, flags);
150 * kmalloc_track_caller is a special version of kmalloc that records the
151 * calling function of the routine calling it for slab leak tracking instead
152 * of just the calling function (confusing, eh?).
153 * It's useful when the call to kmalloc comes from a widely-used standard
154 * allocator where we care about the real place the memory allocation
155 * request comes from.
157 #ifndef CONFIG_DEBUG_SLAB
158 #define kmalloc_track_caller(size, flags) \
159 __kmalloc(size, flags)
161 extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
162 #define kmalloc_track_caller(size, flags) \
163 __kmalloc_track_caller(size, flags, __builtin_return_address(0))
166 extern void *__kzalloc(size_t, gfp_t);
169 * kzalloc - allocate memory. The memory is set to zero.
170 * @size: how many bytes of memory are required.
171 * @flags: the type of memory to allocate (see kmalloc).
173 static inline void *kzalloc(size_t size, gfp_t flags)
175 if (__builtin_constant_p(size)) {
182 #include "kmalloc_sizes.h"
185 extern void __you_cannot_kzalloc_that_much(void);
186 __you_cannot_kzalloc_that_much();
189 return kmem_cache_zalloc((flags & GFP_DMA) ?
190 malloc_sizes[i].cs_dmacachep :
191 malloc_sizes[i].cs_cachep, flags);
193 return __kzalloc(size, flags);
197 * kcalloc - allocate memory for an array. The memory is set to zero.
198 * @n: number of elements.
199 * @size: element size.
200 * @flags: the type of memory to allocate.
202 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
204 if (n != 0 && size > ULONG_MAX / n)
206 return kzalloc(n * size, flags);
209 extern void kfree(const void *);
210 extern unsigned int ksize(const void *);
211 extern int slab_is_available(void);
214 extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
215 extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
217 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
219 if (__builtin_constant_p(size)) {
226 #include "kmalloc_sizes.h"
229 extern void __you_cannot_kmalloc_that_much(void);
230 __you_cannot_kmalloc_that_much();
233 return kmem_cache_alloc_node((flags & GFP_DMA) ?
234 malloc_sizes[i].cs_dmacachep :
235 malloc_sizes[i].cs_cachep, flags, node);
237 return __kmalloc_node(size, flags, node);
240 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
242 return kmem_cache_alloc(cachep, flags);
244 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
246 return kmalloc(size, flags);
250 extern int FASTCALL(kmem_cache_reap(int));
251 extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
253 #else /* CONFIG_SLOB */
255 /* SLOB allocator routines */
257 void kmem_cache_init(void);
258 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
260 void (*)(void *, struct kmem_cache *, unsigned long),
261 void (*)(void *, struct kmem_cache *, unsigned long));
262 void kmem_cache_destroy(struct kmem_cache *c);
263 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
264 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
265 void kmem_cache_free(struct kmem_cache *c, void *b);
266 const char *kmem_cache_name(struct kmem_cache *);
267 void *kmalloc(size_t size, gfp_t flags);
268 void *__kzalloc(size_t size, gfp_t flags);
269 void kfree(const void *m);
270 unsigned int ksize(const void *m);
271 unsigned int kmem_cache_size(struct kmem_cache *c);
273 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
275 return __kzalloc(n * size, flags);
278 #define kmem_cache_shrink(d) (0)
279 #define kmem_cache_reap(a)
280 #define kmem_ptr_validate(a, b) (0)
281 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
282 #define kmalloc_node(s, f, n) kmalloc(s, f)
283 #define kzalloc(s, f) __kzalloc(s, f)
284 #define kmalloc_track_caller kmalloc
286 #endif /* CONFIG_SLOB */
288 /* System wide caches */
289 extern kmem_cache_t *vm_area_cachep;
290 extern kmem_cache_t *names_cachep;
291 extern kmem_cache_t *files_cachep;
292 extern kmem_cache_t *filp_cachep;
293 extern kmem_cache_t *fs_cachep;
294 extern kmem_cache_t *sighand_cachep;
295 extern kmem_cache_t *bio_cachep;
297 #endif /* __KERNEL__ */
299 #endif /* _LINUX_SLAB_H */