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 | |
| 12 | typedef struct kmem_cache_s kmem_cache_t; |
| 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 | |
| 56 | /* prototypes */ |
| 57 | extern void __init kmem_cache_init(void); |
| 58 | |
| 59 | extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long, |
| 60 | void (*)(void *, kmem_cache_t *, unsigned long), |
| 61 | void (*)(void *, kmem_cache_t *, unsigned long)); |
| 62 | extern int kmem_cache_destroy(kmem_cache_t *); |
| 63 | extern int kmem_cache_shrink(kmem_cache_t *); |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 64 | extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | extern void kmem_cache_free(kmem_cache_t *, void *); |
| 66 | extern unsigned int kmem_cache_size(kmem_cache_t *); |
Arnaldo Carvalho de Melo | 1944972 | 2005-06-18 22:46:19 -0700 | [diff] [blame] | 67 | extern const char *kmem_cache_name(kmem_cache_t *); |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 68 | 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] | 69 | |
| 70 | /* Size description struct for general caches. */ |
| 71 | struct cache_sizes { |
| 72 | size_t cs_size; |
| 73 | kmem_cache_t *cs_cachep; |
| 74 | kmem_cache_t *cs_dmacachep; |
| 75 | }; |
| 76 | extern struct cache_sizes malloc_sizes[]; |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 77 | extern void *__kmalloc(size_t, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 79 | static inline void *kmalloc(size_t size, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | { |
| 81 | if (__builtin_constant_p(size)) { |
| 82 | int i = 0; |
| 83 | #define CACHE(x) \ |
| 84 | if (size <= x) \ |
| 85 | goto found; \ |
| 86 | else \ |
| 87 | i++; |
| 88 | #include "kmalloc_sizes.h" |
| 89 | #undef CACHE |
| 90 | { |
| 91 | extern void __you_cannot_kmalloc_that_much(void); |
| 92 | __you_cannot_kmalloc_that_much(); |
| 93 | } |
| 94 | found: |
| 95 | return kmem_cache_alloc((flags & GFP_DMA) ? |
| 96 | malloc_sizes[i].cs_dmacachep : |
| 97 | malloc_sizes[i].cs_cachep, flags); |
| 98 | } |
| 99 | return __kmalloc(size, flags); |
| 100 | } |
| 101 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 102 | extern void *kzalloc(size_t, gfp_t); |
Pekka J Enberg | dd39271 | 2005-09-06 15:18:31 -0700 | [diff] [blame] | 103 | |
| 104 | /** |
| 105 | * kcalloc - allocate memory for an array. The memory is set to zero. |
| 106 | * @n: number of elements. |
| 107 | * @size: element size. |
| 108 | * @flags: the type of memory to allocate. |
| 109 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 110 | 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] | 111 | { |
| 112 | if (n != 0 && size > INT_MAX / n) |
| 113 | return NULL; |
| 114 | return kzalloc(n * size, flags); |
| 115 | } |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | extern void kfree(const void *); |
| 118 | extern unsigned int ksize(const void *); |
| 119 | |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 120 | #ifdef CONFIG_NUMA |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 121 | extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); |
| 122 | extern void *kmalloc_node(size_t size, gfp_t flags, int node); |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 123 | #else |
| 124 | static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, int flags, int node) |
| 125 | { |
| 126 | return kmem_cache_alloc(cachep, flags); |
| 127 | } |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame^] | 128 | 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] | 129 | { |
| 130 | return kmalloc(size, flags); |
| 131 | } |
| 132 | #endif |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | extern int FASTCALL(kmem_cache_reap(int)); |
| 135 | extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); |
| 136 | |
| 137 | /* System wide caches */ |
| 138 | extern kmem_cache_t *vm_area_cachep; |
| 139 | extern kmem_cache_t *names_cachep; |
| 140 | extern kmem_cache_t *files_cachep; |
| 141 | extern kmem_cache_t *filp_cachep; |
| 142 | extern kmem_cache_t *fs_cachep; |
| 143 | extern kmem_cache_t *signal_cachep; |
| 144 | extern kmem_cache_t *sighand_cachep; |
| 145 | extern kmem_cache_t *bio_cachep; |
| 146 | |
| 147 | extern atomic_t slab_reclaim_pages; |
| 148 | |
| 149 | #endif /* __KERNEL__ */ |
| 150 | |
| 151 | #endif /* _LINUX_SLAB_H */ |