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1da177e4 LT |
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 | ||
2109a2d1 | 12 | typedef struct kmem_cache kmem_cache_t; |
1da177e4 | 13 | |
1da177e4 LT |
14 | #include <linux/gfp.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/types.h> | |
17 | #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */ | |
18 | #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */ | |
19 | ||
20 | /* flags for kmem_cache_alloc() */ | |
21 | #define SLAB_NOFS GFP_NOFS | |
22 | #define SLAB_NOIO GFP_NOIO | |
23 | #define SLAB_ATOMIC GFP_ATOMIC | |
24 | #define SLAB_USER GFP_USER | |
25 | #define SLAB_KERNEL GFP_KERNEL | |
26 | #define SLAB_DMA GFP_DMA | |
27 | ||
28 | #define SLAB_LEVEL_MASK GFP_LEVEL_MASK | |
29 | ||
30 | #define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */ | |
31 | ||
32 | /* flags to pass to kmem_cache_create(). | |
33 | * The first 3 are only valid when the allocator as been build | |
34 | * SLAB_DEBUG_SUPPORT. | |
35 | */ | |
36 | #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */ | |
37 | #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */ | |
38 | #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */ | |
39 | #define SLAB_POISON 0x00000800UL /* Poison objects */ | |
1da177e4 LT |
40 | #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */ |
41 | #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */ | |
42 | #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */ | |
43 | #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */ | |
44 | #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate | |
45 | what is reclaimable later*/ | |
46 | #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */ | |
47 | #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */ | |
101a5001 | 48 | #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */ |
1da177e4 LT |
49 | |
50 | /* flags passed to a constructor func */ | |
51 | #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */ | |
52 | #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */ | |
53 | #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */ | |
54 | ||
10cef602 MM |
55 | #ifndef CONFIG_SLOB |
56 | ||
1da177e4 LT |
57 | /* prototypes */ |
58 | extern void __init kmem_cache_init(void); | |
59 | ||
60 | extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long, | |
61 | void (*)(void *, kmem_cache_t *, unsigned long), | |
62 | void (*)(void *, kmem_cache_t *, unsigned long)); | |
63 | extern int kmem_cache_destroy(kmem_cache_t *); | |
64 | extern int kmem_cache_shrink(kmem_cache_t *); | |
dd0fc66f | 65 | extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t); |
a8c0f9a4 | 66 | extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); |
1da177e4 LT |
67 | extern void kmem_cache_free(kmem_cache_t *, void *); |
68 | extern unsigned int kmem_cache_size(kmem_cache_t *); | |
1944972d | 69 | extern const char *kmem_cache_name(kmem_cache_t *); |
1da177e4 LT |
70 | |
71 | /* Size description struct for general caches. */ | |
72 | struct cache_sizes { | |
73 | size_t cs_size; | |
74 | kmem_cache_t *cs_cachep; | |
75 | kmem_cache_t *cs_dmacachep; | |
76 | }; | |
77 | extern struct cache_sizes malloc_sizes[]; | |
7fd6b141 | 78 | |
dd0fc66f | 79 | extern void *__kmalloc(size_t, gfp_t); |
871751e2 AV |
80 | #ifndef CONFIG_DEBUG_SLAB |
81 | #define ____kmalloc(size, flags) __kmalloc(size, flags) | |
7fd6b141 PE |
82 | #else |
83 | extern void *__kmalloc_track_caller(size_t, gfp_t, void*); | |
871751e2 | 84 | #define ____kmalloc(size, flags) \ |
7fd6b141 PE |
85 | __kmalloc_track_caller(size, flags, __builtin_return_address(0)) |
86 | #endif | |
1da177e4 | 87 | |
800590f5 PD |
88 | /** |
89 | * kmalloc - allocate memory | |
90 | * @size: how many bytes of memory are required. | |
91 | * @flags: the type of memory to allocate. | |
92 | * | |
93 | * kmalloc is the normal method of allocating memory | |
94 | * in the kernel. | |
95 | * | |
96 | * The @flags argument may be one of: | |
97 | * | |
98 | * %GFP_USER - Allocate memory on behalf of user. May sleep. | |
99 | * | |
100 | * %GFP_KERNEL - Allocate normal kernel ram. May sleep. | |
101 | * | |
102 | * %GFP_ATOMIC - Allocation will not sleep. | |
103 | * For example, use this inside interrupt handlers. | |
104 | * | |
105 | * %GFP_HIGHUSER - Allocate pages from high memory. | |
106 | * | |
107 | * %GFP_NOIO - Do not do any I/O at all while trying to get memory. | |
108 | * | |
109 | * %GFP_NOFS - Do not make any fs calls while trying to get memory. | |
110 | * | |
111 | * Also it is possible to set different flags by OR'ing | |
112 | * in one or more of the following additional @flags: | |
113 | * | |
114 | * %__GFP_COLD - Request cache-cold pages instead of | |
115 | * trying to return cache-warm pages. | |
116 | * | |
117 | * %__GFP_DMA - Request memory from the DMA-capable zone. | |
118 | * | |
119 | * %__GFP_HIGH - This allocation has high priority and may use emergency pools. | |
120 | * | |
121 | * %__GFP_HIGHMEM - Allocated memory may be from highmem. | |
122 | * | |
123 | * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail | |
124 | * (think twice before using). | |
125 | * | |
126 | * %__GFP_NORETRY - If memory is not immediately available, | |
127 | * then give up at once. | |
128 | * | |
129 | * %__GFP_NOWARN - If allocation fails, don't issue any warnings. | |
130 | * | |
131 | * %__GFP_REPEAT - If allocation fails initially, try once more before failing. | |
132 | */ | |
dd0fc66f | 133 | static inline void *kmalloc(size_t size, gfp_t flags) |
1da177e4 LT |
134 | { |
135 | if (__builtin_constant_p(size)) { | |
136 | int i = 0; | |
137 | #define CACHE(x) \ | |
138 | if (size <= x) \ | |
139 | goto found; \ | |
140 | else \ | |
141 | i++; | |
142 | #include "kmalloc_sizes.h" | |
143 | #undef CACHE | |
144 | { | |
145 | extern void __you_cannot_kmalloc_that_much(void); | |
146 | __you_cannot_kmalloc_that_much(); | |
147 | } | |
148 | found: | |
149 | return kmem_cache_alloc((flags & GFP_DMA) ? | |
150 | malloc_sizes[i].cs_dmacachep : | |
151 | malloc_sizes[i].cs_cachep, flags); | |
152 | } | |
153 | return __kmalloc(size, flags); | |
154 | } | |
155 | ||
40c07ae8 PE |
156 | extern void *__kzalloc(size_t, gfp_t); |
157 | ||
800590f5 PD |
158 | /** |
159 | * kzalloc - allocate memory. The memory is set to zero. | |
160 | * @size: how many bytes of memory are required. | |
161 | * @flags: the type of memory to allocate (see kmalloc). | |
162 | */ | |
40c07ae8 PE |
163 | static inline void *kzalloc(size_t size, gfp_t flags) |
164 | { | |
165 | if (__builtin_constant_p(size)) { | |
166 | int i = 0; | |
167 | #define CACHE(x) \ | |
168 | if (size <= x) \ | |
169 | goto found; \ | |
170 | else \ | |
171 | i++; | |
172 | #include "kmalloc_sizes.h" | |
173 | #undef CACHE | |
174 | { | |
175 | extern void __you_cannot_kzalloc_that_much(void); | |
176 | __you_cannot_kzalloc_that_much(); | |
177 | } | |
178 | found: | |
179 | return kmem_cache_zalloc((flags & GFP_DMA) ? | |
180 | malloc_sizes[i].cs_dmacachep : | |
181 | malloc_sizes[i].cs_cachep, flags); | |
182 | } | |
183 | return __kzalloc(size, flags); | |
184 | } | |
dd392710 PE |
185 | |
186 | /** | |
187 | * kcalloc - allocate memory for an array. The memory is set to zero. | |
188 | * @n: number of elements. | |
189 | * @size: element size. | |
190 | * @flags: the type of memory to allocate. | |
191 | */ | |
dd0fc66f | 192 | static inline void *kcalloc(size_t n, size_t size, gfp_t flags) |
dd392710 | 193 | { |
b50ec7d8 | 194 | if (n != 0 && size > ULONG_MAX / n) |
dd392710 PE |
195 | return NULL; |
196 | return kzalloc(n * size, flags); | |
197 | } | |
198 | ||
1da177e4 LT |
199 | extern void kfree(const void *); |
200 | extern unsigned int ksize(const void *); | |
39d24e64 | 201 | extern int slab_is_available(void); |
1da177e4 | 202 | |
97e2bde4 | 203 | #ifdef CONFIG_NUMA |
dd0fc66f AV |
204 | extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); |
205 | extern void *kmalloc_node(size_t size, gfp_t flags, int node); | |
97e2bde4 | 206 | #else |
6daa0e28 | 207 | static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node) |
97e2bde4 MS |
208 | { |
209 | return kmem_cache_alloc(cachep, flags); | |
210 | } | |
dd0fc66f | 211 | static inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
97e2bde4 MS |
212 | { |
213 | return kmalloc(size, flags); | |
214 | } | |
215 | #endif | |
216 | ||
1da177e4 LT |
217 | extern int FASTCALL(kmem_cache_reap(int)); |
218 | extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); | |
219 | ||
10cef602 MM |
220 | #else /* CONFIG_SLOB */ |
221 | ||
222 | /* SLOB allocator routines */ | |
223 | ||
224 | void kmem_cache_init(void); | |
10cef602 MM |
225 | struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t, |
226 | unsigned long, | |
227 | void (*)(void *, struct kmem_cache *, unsigned long), | |
228 | void (*)(void *, struct kmem_cache *, unsigned long)); | |
229 | int kmem_cache_destroy(struct kmem_cache *c); | |
230 | void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags); | |
a8c0f9a4 | 231 | void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); |
10cef602 MM |
232 | void kmem_cache_free(struct kmem_cache *c, void *b); |
233 | const char *kmem_cache_name(struct kmem_cache *); | |
234 | void *kmalloc(size_t size, gfp_t flags); | |
40c07ae8 | 235 | void *__kzalloc(size_t size, gfp_t flags); |
10cef602 MM |
236 | void kfree(const void *m); |
237 | unsigned int ksize(const void *m); | |
238 | unsigned int kmem_cache_size(struct kmem_cache *c); | |
239 | ||
240 | static inline void *kcalloc(size_t n, size_t size, gfp_t flags) | |
241 | { | |
40c07ae8 | 242 | return __kzalloc(n * size, flags); |
10cef602 MM |
243 | } |
244 | ||
245 | #define kmem_cache_shrink(d) (0) | |
246 | #define kmem_cache_reap(a) | |
247 | #define kmem_ptr_validate(a, b) (0) | |
248 | #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f) | |
249 | #define kmalloc_node(s, f, n) kmalloc(s, f) | |
40c07ae8 | 250 | #define kzalloc(s, f) __kzalloc(s, f) |
871751e2 | 251 | #define ____kmalloc kmalloc |
10cef602 MM |
252 | |
253 | #endif /* CONFIG_SLOB */ | |
254 | ||
1da177e4 LT |
255 | /* System wide caches */ |
256 | extern kmem_cache_t *vm_area_cachep; | |
257 | extern kmem_cache_t *names_cachep; | |
258 | extern kmem_cache_t *files_cachep; | |
259 | extern kmem_cache_t *filp_cachep; | |
260 | extern kmem_cache_t *fs_cachep; | |
1da177e4 LT |
261 | extern kmem_cache_t *sighand_cachep; |
262 | extern kmem_cache_t *bio_cachep; | |
263 | ||
264 | extern atomic_t slab_reclaim_pages; | |
265 | ||
266 | #endif /* __KERNEL__ */ | |
267 | ||
268 | #endif /* _LINUX_SLAB_H */ |