1 /* 2 * linux/mm/slab.h 3 * Written by Mark Hemment, 1996. 4 * ([email protected]) 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 *); 64 extern void *kmem_cache_alloc(kmem_cache_t *, unsigned int __nocast); 65 extern void kmem_cache_free(kmem_cache_t *, void *); 66 extern unsigned int kmem_cache_size(kmem_cache_t *); 67 extern const char *kmem_cache_name(kmem_cache_t *); 68 extern kmem_cache_t *kmem_find_general_cachep(size_t size, int gfpflags); 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[]; 77 extern void *__kmalloc(size_t, unsigned int __nocast); 78 79 static inline void *kmalloc(size_t size, unsigned int __nocast flags) 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 } 101 102 extern void *kcalloc(size_t, size_t, unsigned int __nocast); 103 extern void kfree(const void *); 104 extern unsigned int ksize(const void *); 105 106 #ifdef CONFIG_NUMA 107 extern void *kmem_cache_alloc_node(kmem_cache_t *, int flags, int node); 108 extern void *kmalloc_node(size_t size, int flags, int node); 109 #else 110 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, int flags, int node) 111 { 112 return kmem_cache_alloc(cachep, flags); 113 } 114 static inline void *kmalloc_node(size_t size, int flags, int node) 115 { 116 return kmalloc(size, flags); 117 } 118 #endif 119 120 extern int FASTCALL(kmem_cache_reap(int)); 121 extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); 122 123 /* System wide caches */ 124 extern kmem_cache_t *vm_area_cachep; 125 extern kmem_cache_t *names_cachep; 126 extern kmem_cache_t *files_cachep; 127 extern kmem_cache_t *filp_cachep; 128 extern kmem_cache_t *fs_cachep; 129 extern kmem_cache_t *signal_cachep; 130 extern kmem_cache_t *sighand_cachep; 131 extern kmem_cache_t *bio_cachep; 132 133 extern atomic_t slab_reclaim_pages; 134 135 #endif /* __KERNEL__ */ 136 137 #endif /* _LINUX_SLAB_H */ 138