Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Pekka J Enberg | 2109a2d | 2005-11-07 00:58:01 -0800 | [diff] [blame] | 12 | typedef struct kmem_cache kmem_cache_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| 14 | #include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */ |
| 15 | #include <linux/gfp.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */ |
| 19 | #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */ |
| 20 | |
| 21 | /* flags for kmem_cache_alloc() */ |
| 22 | #define SLAB_NOFS GFP_NOFS |
| 23 | #define SLAB_NOIO GFP_NOIO |
| 24 | #define SLAB_ATOMIC GFP_ATOMIC |
| 25 | #define SLAB_USER GFP_USER |
| 26 | #define SLAB_KERNEL GFP_KERNEL |
| 27 | #define SLAB_DMA GFP_DMA |
| 28 | |
| 29 | #define SLAB_LEVEL_MASK GFP_LEVEL_MASK |
| 30 | |
| 31 | #define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */ |
| 32 | |
| 33 | /* flags to pass to kmem_cache_create(). |
| 34 | * The first 3 are only valid when the allocator as been build |
| 35 | * SLAB_DEBUG_SUPPORT. |
| 36 | */ |
| 37 | #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */ |
| 38 | #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */ |
| 39 | #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */ |
| 40 | #define SLAB_POISON 0x00000800UL /* Poison objects */ |
| 41 | #define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */ |
| 42 | #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */ |
| 43 | #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */ |
| 44 | #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */ |
| 45 | #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */ |
| 46 | #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate |
| 47 | what is reclaimable later*/ |
| 48 | #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */ |
| 49 | #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */ |
| 50 | |
| 51 | /* flags passed to a constructor func */ |
| 52 | #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */ |
| 53 | #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */ |
| 54 | #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */ |
| 55 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 56 | #ifndef CONFIG_SLOB |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | /* prototypes */ |
| 59 | extern void __init kmem_cache_init(void); |
| 60 | |
| 61 | extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long, |
| 62 | void (*)(void *, kmem_cache_t *, unsigned long), |
| 63 | void (*)(void *, kmem_cache_t *, unsigned long)); |
| 64 | extern int kmem_cache_destroy(kmem_cache_t *); |
| 65 | extern int kmem_cache_shrink(kmem_cache_t *); |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 66 | extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | extern void kmem_cache_free(kmem_cache_t *, void *); |
| 68 | extern unsigned int kmem_cache_size(kmem_cache_t *); |
Arnaldo Carvalho de Melo | 1944972 | 2005-06-18 22:46:19 -0700 | [diff] [blame] | 69 | extern const char *kmem_cache_name(kmem_cache_t *); |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 70 | extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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[]; |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 79 | |
| 80 | #ifndef CONFIG_DEBUG_SLAB |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 81 | extern void *__kmalloc(size_t, gfp_t); |
Pekka Enberg | 7fd6b14 | 2006-02-01 03:05:52 -0800 | [diff] [blame] | 82 | #else |
| 83 | extern void *__kmalloc_track_caller(size_t, gfp_t, void*); |
| 84 | #define __kmalloc(size, flags) \ |
| 85 | __kmalloc_track_caller(size, flags, __builtin_return_address(0)) |
| 86 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 88 | static inline void *kmalloc(size_t size, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | if (__builtin_constant_p(size)) { |
| 91 | int i = 0; |
| 92 | #define CACHE(x) \ |
| 93 | if (size <= x) \ |
| 94 | goto found; \ |
| 95 | else \ |
| 96 | i++; |
| 97 | #include "kmalloc_sizes.h" |
| 98 | #undef CACHE |
| 99 | { |
| 100 | extern void __you_cannot_kmalloc_that_much(void); |
| 101 | __you_cannot_kmalloc_that_much(); |
| 102 | } |
| 103 | found: |
| 104 | return kmem_cache_alloc((flags & GFP_DMA) ? |
| 105 | malloc_sizes[i].cs_dmacachep : |
| 106 | malloc_sizes[i].cs_cachep, flags); |
| 107 | } |
| 108 | return __kmalloc(size, flags); |
| 109 | } |
| 110 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 111 | extern void *kzalloc(size_t, gfp_t); |
Pekka J Enberg | dd39271 | 2005-09-06 15:18:31 -0700 | [diff] [blame] | 112 | |
| 113 | /** |
| 114 | * kcalloc - allocate memory for an array. The memory is set to zero. |
| 115 | * @n: number of elements. |
| 116 | * @size: element size. |
| 117 | * @flags: the type of memory to allocate. |
| 118 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 119 | static inline void *kcalloc(size_t n, size_t size, gfp_t flags) |
Pekka J Enberg | dd39271 | 2005-09-06 15:18:31 -0700 | [diff] [blame] | 120 | { |
Adrian Bunk | b50ec7d | 2006-03-22 00:08:09 -0800 | [diff] [blame^] | 121 | if (n != 0 && size > ULONG_MAX / n) |
Pekka J Enberg | dd39271 | 2005-09-06 15:18:31 -0700 | [diff] [blame] | 122 | return NULL; |
| 123 | return kzalloc(n * size, flags); |
| 124 | } |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | extern void kfree(const void *); |
| 127 | extern unsigned int ksize(const void *); |
| 128 | |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 129 | #ifdef CONFIG_NUMA |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 130 | extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); |
| 131 | extern void *kmalloc_node(size_t size, gfp_t flags, int node); |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 132 | #else |
Al Viro | 6daa0e2 | 2005-10-21 03:18:50 -0400 | [diff] [blame] | 133 | static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node) |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 134 | { |
| 135 | return kmem_cache_alloc(cachep, flags); |
| 136 | } |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 137 | static inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 138 | { |
| 139 | return kmalloc(size, flags); |
| 140 | } |
| 141 | #endif |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | extern int FASTCALL(kmem_cache_reap(int)); |
| 144 | extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); |
| 145 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 146 | #else /* CONFIG_SLOB */ |
| 147 | |
| 148 | /* SLOB allocator routines */ |
| 149 | |
| 150 | void kmem_cache_init(void); |
| 151 | struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags); |
| 152 | struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t, |
| 153 | unsigned long, |
| 154 | void (*)(void *, struct kmem_cache *, unsigned long), |
| 155 | void (*)(void *, struct kmem_cache *, unsigned long)); |
| 156 | int kmem_cache_destroy(struct kmem_cache *c); |
| 157 | void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags); |
| 158 | void kmem_cache_free(struct kmem_cache *c, void *b); |
| 159 | const char *kmem_cache_name(struct kmem_cache *); |
| 160 | void *kmalloc(size_t size, gfp_t flags); |
| 161 | void *kzalloc(size_t size, gfp_t flags); |
| 162 | void kfree(const void *m); |
| 163 | unsigned int ksize(const void *m); |
| 164 | unsigned int kmem_cache_size(struct kmem_cache *c); |
| 165 | |
| 166 | static inline void *kcalloc(size_t n, size_t size, gfp_t flags) |
| 167 | { |
| 168 | return kzalloc(n * size, flags); |
| 169 | } |
| 170 | |
| 171 | #define kmem_cache_shrink(d) (0) |
| 172 | #define kmem_cache_reap(a) |
| 173 | #define kmem_ptr_validate(a, b) (0) |
| 174 | #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f) |
| 175 | #define kmalloc_node(s, f, n) kmalloc(s, f) |
| 176 | |
| 177 | #endif /* CONFIG_SLOB */ |
| 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | /* System wide caches */ |
| 180 | extern kmem_cache_t *vm_area_cachep; |
| 181 | extern kmem_cache_t *names_cachep; |
| 182 | extern kmem_cache_t *files_cachep; |
| 183 | extern kmem_cache_t *filp_cachep; |
| 184 | extern kmem_cache_t *fs_cachep; |
| 185 | extern kmem_cache_t *signal_cachep; |
| 186 | extern kmem_cache_t *sighand_cachep; |
| 187 | extern kmem_cache_t *bio_cachep; |
| 188 | |
| 189 | extern atomic_t slab_reclaim_pages; |
| 190 | |
| 191 | #endif /* __KERNEL__ */ |
| 192 | |
| 193 | #endif /* _LINUX_SLAB_H */ |