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Linux kernel mirror (for testing)
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linux
1/*
2 * linux/mm/slab.h
3 * Written by Mark Hemment, 1996.
4 * (markhe@nextd.demon.co.uk)
5 */
6
7#ifndef _LINUX_SLAB_H
8#define _LINUX_SLAB_H
9
10#if defined(__KERNEL__)
11
12typedef struct kmem_cache 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#ifndef CONFIG_SLOB
57
58/* prototypes */
59extern void __init kmem_cache_init(void);
60
61extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
62 void (*)(void *, kmem_cache_t *, unsigned long),
63 void (*)(void *, kmem_cache_t *, unsigned long));
64extern int kmem_cache_destroy(kmem_cache_t *);
65extern int kmem_cache_shrink(kmem_cache_t *);
66extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
67extern void kmem_cache_free(kmem_cache_t *, void *);
68extern unsigned int kmem_cache_size(kmem_cache_t *);
69extern const char *kmem_cache_name(kmem_cache_t *);
70extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
71
72/* Size description struct for general caches. */
73struct cache_sizes {
74 size_t cs_size;
75 kmem_cache_t *cs_cachep;
76 kmem_cache_t *cs_dmacachep;
77};
78extern struct cache_sizes malloc_sizes[];
79extern void *__kmalloc(size_t, gfp_t);
80
81static inline void *kmalloc(size_t size, gfp_t flags)
82{
83 if (__builtin_constant_p(size)) {
84 int i = 0;
85#define CACHE(x) \
86 if (size <= x) \
87 goto found; \
88 else \
89 i++;
90#include "kmalloc_sizes.h"
91#undef CACHE
92 {
93 extern void __you_cannot_kmalloc_that_much(void);
94 __you_cannot_kmalloc_that_much();
95 }
96found:
97 return kmem_cache_alloc((flags & GFP_DMA) ?
98 malloc_sizes[i].cs_dmacachep :
99 malloc_sizes[i].cs_cachep, flags);
100 }
101 return __kmalloc(size, flags);
102}
103
104extern void *kzalloc(size_t, gfp_t);
105
106/**
107 * kcalloc - allocate memory for an array. The memory is set to zero.
108 * @n: number of elements.
109 * @size: element size.
110 * @flags: the type of memory to allocate.
111 */
112static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
113{
114 if (n != 0 && size > INT_MAX / n)
115 return NULL;
116 return kzalloc(n * size, flags);
117}
118
119extern void kfree(const void *);
120extern unsigned int ksize(const void *);
121
122#ifdef CONFIG_NUMA
123extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
124extern void *kmalloc_node(size_t size, gfp_t flags, int node);
125#else
126static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
127{
128 return kmem_cache_alloc(cachep, flags);
129}
130static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
131{
132 return kmalloc(size, flags);
133}
134#endif
135
136extern int FASTCALL(kmem_cache_reap(int));
137extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
138
139#else /* CONFIG_SLOB */
140
141/* SLOB allocator routines */
142
143void kmem_cache_init(void);
144struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
145struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
146 unsigned long,
147 void (*)(void *, struct kmem_cache *, unsigned long),
148 void (*)(void *, struct kmem_cache *, unsigned long));
149int kmem_cache_destroy(struct kmem_cache *c);
150void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
151void kmem_cache_free(struct kmem_cache *c, void *b);
152const char *kmem_cache_name(struct kmem_cache *);
153void *kmalloc(size_t size, gfp_t flags);
154void *kzalloc(size_t size, gfp_t flags);
155void kfree(const void *m);
156unsigned int ksize(const void *m);
157unsigned int kmem_cache_size(struct kmem_cache *c);
158
159static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
160{
161 return kzalloc(n * size, flags);
162}
163
164#define kmem_cache_shrink(d) (0)
165#define kmem_cache_reap(a)
166#define kmem_ptr_validate(a, b) (0)
167#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
168#define kmalloc_node(s, f, n) kmalloc(s, f)
169
170#endif /* CONFIG_SLOB */
171
172/* System wide caches */
173extern kmem_cache_t *vm_area_cachep;
174extern kmem_cache_t *names_cachep;
175extern kmem_cache_t *files_cachep;
176extern kmem_cache_t *filp_cachep;
177extern kmem_cache_t *fs_cachep;
178extern kmem_cache_t *signal_cachep;
179extern kmem_cache_t *sighand_cachep;
180extern kmem_cache_t *bio_cachep;
181
182extern atomic_t slab_reclaim_pages;
183
184#endif /* __KERNEL__ */
185
186#endif /* _LINUX_SLAB_H */