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