1 /* 2 * linux/mm/slab.h 3 * Written by Mark Hemment, 1996. 4 * (markhe (at) 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 */ 271
