slab.h

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/*
 * linux/mm/slab.h
 * Written by Mark Hemment, 1996.
 * (markhe@nextd.demon.co.uk)
 */

#if     !defined(_LINUX_SLAB_H)
#define _LINUX_SLAB_H

#if     defined(__KERNEL__)

typedef struct kmem_cache_s kmem_cache_t;

#include        <linux/mm.h>
#include        <asm/cache.h>

/* flags for kmem_cache_alloc() */
#define SLAB_BUFFER             GFP_BUFFER
#define SLAB_ATOMIC             GFP_ATOMIC
#define SLAB_USER               GFP_USER
#define SLAB_KERNEL             GFP_KERNEL
#define SLAB_NFS                GFP_NFS
#define SLAB_DMA                GFP_DMA

#define SLAB_LEVEL_MASK         0x0000007fUL
#define SLAB_NO_GROW            0x00001000UL    /* 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 */
#if     0
#define SLAB_HIGH_PACK          0x00004000UL    /* XXX */
#endif

/* 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 long kmem_cache_init(long, long);
extern void kmem_cache_sizes_init(void);
extern kmem_cache_t *kmem_find_general_cachep(size_t);
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 *, int);
extern void kmem_cache_free(kmem_cache_t *, void *);

extern void *kmalloc(size_t, int);
extern void kfree(const void *);
extern void kfree_s(const void *, size_t);

extern void kmem_cache_reap(int);
extern int get_slabinfo(char *);

/* System wide caches */
extern kmem_cache_t     *vm_area_cachep;
extern kmem_cache_t     *mm_cachep;

#endif  /* __KERNEL__ */

#endif  /* _LINUX_SLAB_H */

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