include/linux/slab.h

   1 /*
   2  * linux/mm/slab.h
   3  * Written by Mark Hemment, 1996.
   4  * (markhe@nextd.demon.co.uk)
   5  */
   6
   7 #ifndef _LINUX_SLAB_H
   8 #define _LINUX_SLAB_H
   9
  10 #if     defined(__KERNEL__)
  11
  12 typedef struct kmem_cache kmem_cache_t;
  13
  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 */
  19
  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
  27
  28 #define SLAB_LEVEL_MASK         GFP_LEVEL_MASK
  29
  30 #define SLAB_NO_GROW            __GFP_NO_GROW   /* don't grow a cache */
  31
  32 /* flags to pass to kmem_cache_create().
  33  * The first 3 are only valid when the allocator as been build
  34  * SLAB_DEBUG_SUPPORT.
  35  */
  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 */
  49
  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 */
  54
  55 #ifndef CONFIG_SLOB
  56
  57 /* prototypes */
  58 extern void __init kmem_cache_init(void);
  59
  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 int 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 *);
  70 extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
  71
  72 /* Size description struct for general caches. */
  73 struct cache_sizes {
  74         size_t           cs_size;
  75         kmem_cache_t    *cs_cachep;
  76         kmem_cache_t    *cs_dmacachep;
  77 };
  78 extern struct cache_sizes malloc_sizes[];
  79
  80 extern void *__kmalloc(size_t, gfp_t);
  81 #ifndef CONFIG_DEBUG_SLAB
  82 #define ____kmalloc(size, flags) __kmalloc(size, flags)
  83 #else
  84 extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
  85 #define ____kmalloc(size, flags) \
  86     __kmalloc_track_caller(size, flags, __builtin_return_address(0))
  87 #endif
  88
  89 /**
  90  * kmalloc - allocate memory
  91  * @size: how many bytes of memory are required.
  92  * @flags: the type of memory to allocate.
  93  *
  94  * kmalloc is the normal method of allocating memory
  95  * in the kernel.
  96  *
  97  * The @flags argument may be one of:
  98  *
  99  * %GFP_USER - Allocate memory on behalf of user.  May sleep.
 100  *
 101  * %GFP_KERNEL - Allocate normal kernel ram.  May sleep.
 102  *
 103  * %GFP_ATOMIC - Allocation will not sleep.
 104  *   For example, use this inside interrupt handlers.
 105  *
 106  * %GFP_HIGHUSER - Allocate pages from high memory.
 107  *
 108  * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
 109  *
 110  * %GFP_NOFS - Do not make any fs calls while trying to get memory.
 111  *
 112  * Also it is possible to set different flags by OR'ing
 113  * in one or more of the following additional @flags:
 114  *
 115  * %__GFP_COLD - Request cache-cold pages instead of
 116  *   trying to return cache-warm pages.
 117  *
 118  * %__GFP_DMA - Request memory from the DMA-capable zone.
 119  *
 120  * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
 121  *
 122  * %__GFP_HIGHMEM - Allocated memory may be from highmem.
 123  *
 124  * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
 125  *   (think twice before using).
 126  *
 127  * %__GFP_NORETRY - If memory is not immediately available,
 128  *   then give up at once.
 129  *
 130  * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
 131  *
 132  * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
 133  */
 134 static inline void *kmalloc(size_t size, gfp_t flags)
 135 {
 136         if (__builtin_constant_p(size)) {
 137                 int i = 0;
 138 #define CACHE(x) \
 139                 if (size <= x) \
 140                         goto found; \
 141                 else \
 142                         i++;
 143 #include "kmalloc_sizes.h"
 144 #undef CACHE
 145                 {
 146                         extern void __you_cannot_kmalloc_that_much(void);
 147                         __you_cannot_kmalloc_that_much();
 148                 }
 149 found:
 150                 return kmem_cache_alloc((flags & GFP_DMA) ?
 151                         malloc_sizes[i].cs_dmacachep :
 152                         malloc_sizes[i].cs_cachep, flags);
 153         }
 154         return __kmalloc(size, flags);
 155 }
 156
 157 extern void *__kzalloc(size_t, gfp_t);
 158
 159 /**
 160  * kzalloc - allocate memory. The memory is set to zero.
 161  * @size: how many bytes of memory are required.
 162  * @flags: the type of memory to allocate (see kmalloc).
 163  */
 164 static inline void *kzalloc(size_t size, gfp_t flags)
 165 {
 166         if (__builtin_constant_p(size)) {
 167                 int i = 0;
 168 #define CACHE(x) \
 169                 if (size <= x) \
 170                         goto found; \
 171                 else \
 172                         i++;
 173 #include "kmalloc_sizes.h"
 174 #undef CACHE
 175                 {
 176                         extern void __you_cannot_kzalloc_that_much(void);
 177                         __you_cannot_kzalloc_that_much();
 178                 }
 179 found:
 180                 return kmem_cache_zalloc((flags & GFP_DMA) ?
 181                         malloc_sizes[i].cs_dmacachep :
 182                         malloc_sizes[i].cs_cachep, flags);
 183         }
 184         return __kzalloc(size, flags);
 185 }
 186
 187 /**
 188  * kcalloc - allocate memory for an array. The memory is set to zero.
 189  * @n: number of elements.
 190  * @size: element size.
 191  * @flags: the type of memory to allocate.
 192  */
 193 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
 194 {
 195         if (n != 0 && size > ULONG_MAX / n)
 196                 return NULL;
 197         return kzalloc(n * size, flags);
 198 }
 199
 200 extern void kfree(const void *);
 201 extern unsigned int ksize(const void *);
 202 extern int slab_is_available(void);
 203
 204 #ifdef CONFIG_NUMA
 205 extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
 206 extern void *kmalloc_node(size_t size, gfp_t flags, int node);
 207 #else
 208 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
 209 {
 210         return kmem_cache_alloc(cachep, flags);
 211 }
 212 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
 213 {
 214         return kmalloc(size, flags);
 215 }
 216 #endif
 217
 218 extern int FASTCALL(kmem_cache_reap(int));
 219 extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
 220
 221 #else /* CONFIG_SLOB */
 222
 223 /* SLOB allocator routines */
 224
 225 void kmem_cache_init(void);
 226 struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
 227 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
 228         unsigned long,
 229         void (*)(void *, struct kmem_cache *, unsigned long),
 230         void (*)(void *, struct kmem_cache *, unsigned long));
 231 int kmem_cache_destroy(struct kmem_cache *c);
 232 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
 233 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
 234 void kmem_cache_free(struct kmem_cache *c, void *b);
 235 const char *kmem_cache_name(struct kmem_cache *);
 236 void *kmalloc(size_t size, gfp_t flags);
 237 void *__kzalloc(size_t size, gfp_t flags);
 238 void kfree(const void *m);
 239 unsigned int ksize(const void *m);
 240 unsigned int kmem_cache_size(struct kmem_cache *c);
 241
 242 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
 243 {
 244         return __kzalloc(n * size, flags);
 245 }
 246
 247 #define kmem_cache_shrink(d) (0)
 248 #define kmem_cache_reap(a)
 249 #define kmem_ptr_validate(a, b) (0)
 250 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
 251 #define kmalloc_node(s, f, n) kmalloc(s, f)
 252 #define kzalloc(s, f) __kzalloc(s, f)
 253 #define ____kmalloc kmalloc
 254
 255 #endif /* CONFIG_SLOB */
 256
 257 /* System wide caches */
 258 extern kmem_cache_t     *vm_area_cachep;
 259 extern kmem_cache_t     *names_cachep;
 260 extern kmem_cache_t     *files_cachep;
 261 extern kmem_cache_t     *filp_cachep;
 262 extern kmem_cache_t     *fs_cachep;
 263 extern kmem_cache_t     *sighand_cachep;
 264 extern kmem_cache_t     *bio_cachep;
 265
 266 extern atomic_t slab_reclaim_pages;
 267
 268 #endif  /* __KERNEL__ */
 269
 270 #endif  /* _LINUX_SLAB_H */