slab.h
上传用户:szlgq88
上传日期:2009-04-28
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文件大小:5k
- /*
- * linux/mm/slab.h
- * Written by Mark Hemment, 1996.
- * (markhe@nextd.demon.co.uk)
- */
- #ifndef _LINUX_SLAB_H
- #define _LINUX_SLAB_H
- #if defined(__KERNEL__)
- typedef struct kmem_cache_s kmem_cache_t;
- #include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */
- #include <linux/gfp.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
- #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
- /* flags for kmem_cache_alloc() */
- #define SLAB_NOFS GFP_NOFS
- #define SLAB_NOIO GFP_NOIO
- #define SLAB_ATOMIC GFP_ATOMIC
- #define SLAB_USER GFP_USER
- #define SLAB_KERNEL GFP_KERNEL
- #define SLAB_DMA GFP_DMA
- #define SLAB_LEVEL_MASK GFP_LEVEL_MASK
- #define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */
- /* flags to pass to kmem_cache_create().
- * The first 3 are only valid when the allocator as been build
- * SLAB_DEBUG_SUPPORT.
- */
- #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
- #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
- #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
- #define SLAB_POISON 0x00000800UL /* Poison objects */
- #define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */
- #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
- #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
- #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
- #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
- #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
- what is reclaimable later*/
- #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
- #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
- /* flags passed to a constructor func */
- #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
- #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
- #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
- /* prototypes */
- extern void __init kmem_cache_init(void);
- extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
- void (*)(void *, kmem_cache_t *, unsigned long),
- void (*)(void *, kmem_cache_t *, unsigned long));
- extern int kmem_cache_destroy(kmem_cache_t *);
- extern int kmem_cache_shrink(kmem_cache_t *);
- extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
- extern void kmem_cache_free(kmem_cache_t *, void *);
- extern unsigned int kmem_cache_size(kmem_cache_t *);
- extern const char *kmem_cache_name(kmem_cache_t *);
- extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
- /* Size description struct for general caches. */
- struct cache_sizes {
- size_t cs_size;
- kmem_cache_t *cs_cachep;
- kmem_cache_t *cs_dmacachep;
- };
- extern struct cache_sizes malloc_sizes[];
- extern void *__kmalloc(size_t, gfp_t);
- static inline void *kmalloc(size_t size, gfp_t flags)
- {
- if (__builtin_constant_p(size)) {
- int i = 0;
- #define CACHE(x)
- if (size <= x)
- goto found;
- else
- i++;
- #include "kmalloc_sizes.h"
- #undef CACHE
- {
- extern void __you_cannot_kmalloc_that_much(void);
- __you_cannot_kmalloc_that_much();
- }
- found:
- return kmem_cache_alloc((flags & GFP_DMA) ?
- malloc_sizes[i].cs_dmacachep :
- malloc_sizes[i].cs_cachep, flags);
- }
- return __kmalloc(size, flags);
- }
- extern void *kzalloc(size_t, gfp_t);
- /**
- * kcalloc - allocate memory for an array. The memory is set to zero.
- * @n: number of elements.
- * @size: element size.
- * @flags: the type of memory to allocate.
- */
- static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
- {
- if (n != 0 && size > INT_MAX / n)
- return NULL;
- return kzalloc(n * size, flags);
- }
- extern void kfree(const void *);
- extern unsigned int ksize(const void *);
- #ifdef CONFIG_NUMA
- extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
- extern void *kmalloc_node(size_t size, gfp_t flags, int node);
- #else
- static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, int flags, int node)
- {
- return kmem_cache_alloc(cachep, flags);
- }
- static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
- {
- return kmalloc(size, flags);
- }
- #endif
- extern int FASTCALL(kmem_cache_reap(int));
- extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
- /* System wide caches */
- extern kmem_cache_t *vm_area_cachep;
- extern kmem_cache_t *names_cachep;
- extern kmem_cache_t *files_cachep;
- extern kmem_cache_t *filp_cachep;
- extern kmem_cache_t *fs_cachep;
- extern kmem_cache_t *signal_cachep;
- extern kmem_cache_t *sighand_cachep;
- extern kmem_cache_t *bio_cachep;
- extern atomic_t slab_reclaim_pages;
- #endif /* __KERNEL__ */
- #endif /* _LINUX_SLAB_H */