include/linux/slab.h

   1 /*
   2  * linux/mm/slab.h
   3  * Written by Mark Hemment, 1996.
   4  * (markhe@nextd.demon.co.uk)
   5  */
   6
   7 #if     !defined(_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>
  15 #include        <linux/mm.h>
  16 #include        <linux/cache.h>
  17
  18 /* flags for kmem_cache_alloc() */
  19 #define SLAB_BUFFER             GFP_BUFFER
  20 #define SLAB_ATOMIC             GFP_ATOMIC
  21 #define SLAB_USER               GFP_USER
  22 #define SLAB_KERNEL             GFP_KERNEL
  23 #define SLAB_NFS                GFP_NFS
  24 #define SLAB_DMA                GFP_DMA
  25
  26 #define SLAB_LEVEL_MASK         (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_HIGHMEM)
  27 #define SLAB_NO_GROW            0x00001000UL    /* don't grow a cache */
  28
  29 /* flags to pass to kmem_cache_create().
  30  * The first 3 are only valid when the allocator as been build
  31  * SLAB_DEBUG_SUPPORT.
  32  */
  33 #define SLAB_DEBUG_FREE         0x00000100UL    /* Peform (expensive) checks on free */
  34 #define SLAB_DEBUG_INITIAL      0x00000200UL    /* Call constructor (as verifier) */
  35 #define SLAB_RED_ZONE           0x00000400UL    /* Red zone objs in a cache */
  36 #define SLAB_POISON             0x00000800UL    /* Poison objects */
  37 #define SLAB_NO_REAP            0x00001000UL    /* never reap from the cache */
  38 #define SLAB_HWCACHE_ALIGN      0x00002000UL    /* align objs on a h/w cache lines */
  39 #define SLAB_CACHE_DMA          0x00004000UL    /* use GFP_DMA memory */
  40
  41 /* flags passed to a constructor func */
  42 #define SLAB_CTOR_CONSTRUCTOR   0x001UL         /* if not set, then deconstructor */
  43 #define SLAB_CTOR_ATOMIC        0x002UL         /* tell constructor it can't sleep */
  44 #define SLAB_CTOR_VERIFY        0x004UL         /* tell constructor it's a verify call */
  45
  46 /* prototypes */
  47 extern void kmem_cache_init(void);
  48 extern void kmem_cache_sizes_init(void);
  49
  50 extern kmem_cache_t *kmem_find_general_cachep(size_t, int gfpflags);
  51 extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
  52                                        void (*)(void *, kmem_cache_t *, unsigned long),
  53                                        void (*)(void *, kmem_cache_t *, unsigned long));
  54 extern int kmem_cache_destroy(kmem_cache_t *);
  55 extern int kmem_cache_shrink(kmem_cache_t *);
  56 extern void *kmem_cache_alloc(kmem_cache_t *, int);
  57 extern void kmem_cache_free(kmem_cache_t *, void *);
  58
  59 extern void *kmalloc(size_t, int);
  60 extern void kfree(const void *);
  61
  62 extern void kmem_cache_reap(int);
  63 extern int slabinfo_read_proc(char *page, char **start, off_t off,
  64                                  int count, int *eof, void *data);
  65 extern int slabinfo_write_proc(struct file *file, const char *buffer,
  66                            unsigned long count, void *data);
  67
  68 /* System wide caches */
  69 extern kmem_cache_t     *vm_area_cachep;
  70 extern kmem_cache_t     *mm_cachep;
  71 extern kmem_cache_t     *names_cachep;
  72 extern kmem_cache_t     *files_cachep;
  73 extern kmem_cache_t     *filp_cachep;
  74 extern kmem_cache_t     *dquot_cachep;
  75 extern kmem_cache_t     *bh_cachep;
  76 extern kmem_cache_t     *fs_cachep;
  77 extern kmem_cache_t     *sigact_cachep;
  78
  79 #ifdef CONFIG_SMP
  80 extern unsigned long slab_cache_drain_mask;
  81 extern void slab_drain_local_cache(void);
  82 #else
  83 #define slab_cache_drain_mask 0
  84 #define slab_drain_local_cache()        do { } while (0)
  85 #endif
  86
  87 #endif  /* __KERNEL__ */
  88
  89 #endif  /* _LINUX_SLAB_H */