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1da177e4 | 1 | /* |
2e892f43 CL |
2 | * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk). |
3 | * | |
4 | * (C) SGI 2006, Christoph Lameter <clameter@sgi.com> | |
5 | * Cleaned up and restructured to ease the addition of alternative | |
6 | * implementations of SLAB allocators. | |
1da177e4 LT |
7 | */ |
8 | ||
9 | #ifndef _LINUX_SLAB_H | |
10 | #define _LINUX_SLAB_H | |
11 | ||
1b1cec4b | 12 | #ifdef __KERNEL__ |
1da177e4 | 13 | |
1b1cec4b | 14 | #include <linux/gfp.h> |
1b1cec4b | 15 | #include <linux/types.h> |
1da177e4 | 16 | |
1b1cec4b | 17 | typedef struct kmem_cache kmem_cache_t __deprecated; |
1da177e4 | 18 | |
2e892f43 CL |
19 | /* |
20 | * Flags to pass to kmem_cache_create(). | |
21 | * The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set. | |
1da177e4 | 22 | */ |
55935a34 | 23 | #define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */ |
55935a34 CL |
24 | #define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */ |
25 | #define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */ | |
26 | #define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */ | |
2e892f43 | 27 | #define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */ |
2e892f43 CL |
28 | #define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */ |
29 | #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */ | |
30 | #define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */ | |
31 | #define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */ | |
101a5001 | 32 | #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */ |
81819f0f | 33 | #define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */ |
1da177e4 | 34 | |
2e892f43 | 35 | /* Flags passed to a constructor functions */ |
55935a34 | 36 | #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* If not set, then deconstructor */ |
1da177e4 | 37 | |
2e892f43 CL |
38 | /* |
39 | * struct kmem_cache related prototypes | |
40 | */ | |
41 | void __init kmem_cache_init(void); | |
81819f0f | 42 | int slab_is_available(void); |
1da177e4 | 43 | |
2e892f43 | 44 | struct kmem_cache *kmem_cache_create(const char *, size_t, size_t, |
ebe29738 CL |
45 | unsigned long, |
46 | void (*)(void *, struct kmem_cache *, unsigned long), | |
47 | void (*)(void *, struct kmem_cache *, unsigned long)); | |
2e892f43 CL |
48 | void kmem_cache_destroy(struct kmem_cache *); |
49 | int kmem_cache_shrink(struct kmem_cache *); | |
50 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); | |
51 | void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); | |
52 | void kmem_cache_free(struct kmem_cache *, void *); | |
53 | unsigned int kmem_cache_size(struct kmem_cache *); | |
54 | const char *kmem_cache_name(struct kmem_cache *); | |
55935a34 | 55 | int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr); |
2e892f43 | 56 | |
0a31bd5f CL |
57 | /* |
58 | * Please use this macro to create slab caches. Simply specify the | |
59 | * name of the structure and maybe some flags that are listed above. | |
60 | * | |
61 | * The alignment of the struct determines object alignment. If you | |
62 | * f.e. add ____cacheline_aligned_in_smp to the struct declaration | |
63 | * then the objects will be properly aligned in SMP configurations. | |
64 | */ | |
65 | #define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\ | |
66 | sizeof(struct __struct), __alignof__(struct __struct),\ | |
67 | (__flags), NULL, NULL) | |
68 | ||
2e892f43 CL |
69 | #ifdef CONFIG_NUMA |
70 | extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); | |
71 | #else | |
72 | static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep, | |
73 | gfp_t flags, int node) | |
74 | { | |
75 | return kmem_cache_alloc(cachep, flags); | |
76 | } | |
77 | #endif | |
78 | ||
79 | /* | |
80 | * Common kmalloc functions provided by all allocators | |
81 | */ | |
82 | void *__kmalloc(size_t, gfp_t); | |
83 | void *__kzalloc(size_t, gfp_t); | |
fd76bab2 | 84 | void * __must_check krealloc(const void *, size_t, gfp_t); |
2e892f43 | 85 | void kfree(const void *); |
fd76bab2 | 86 | size_t ksize(const void *); |
2e892f43 CL |
87 | |
88 | /** | |
89 | * kcalloc - allocate memory for an array. The memory is set to zero. | |
90 | * @n: number of elements. | |
91 | * @size: element size. | |
92 | * @flags: the type of memory to allocate. | |
93 | */ | |
94 | static inline void *kcalloc(size_t n, size_t size, gfp_t flags) | |
95 | { | |
96 | if (n != 0 && size > ULONG_MAX / n) | |
97 | return NULL; | |
98 | return __kzalloc(n * size, flags); | |
99 | } | |
1da177e4 | 100 | |
2e892f43 CL |
101 | /* |
102 | * Allocator specific definitions. These are mainly used to establish optimized | |
103 | * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by selecting | |
104 | * the appropriate general cache at compile time. | |
105 | */ | |
55935a34 | 106 | |
81819f0f CL |
107 | #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB) |
108 | #ifdef CONFIG_SLUB | |
109 | #include <linux/slub_def.h> | |
110 | #else | |
2e892f43 | 111 | #include <linux/slab_def.h> |
81819f0f | 112 | #endif /* !CONFIG_SLUB */ |
2e892f43 | 113 | #else |
81819f0f | 114 | |
2e892f43 CL |
115 | /* |
116 | * Fallback definitions for an allocator not wanting to provide | |
117 | * its own optimized kmalloc definitions (like SLOB). | |
118 | */ | |
119 | ||
800590f5 PD |
120 | /** |
121 | * kmalloc - allocate memory | |
122 | * @size: how many bytes of memory are required. | |
123 | * @flags: the type of memory to allocate. | |
124 | * | |
125 | * kmalloc is the normal method of allocating memory | |
126 | * in the kernel. | |
127 | * | |
128 | * The @flags argument may be one of: | |
129 | * | |
130 | * %GFP_USER - Allocate memory on behalf of user. May sleep. | |
131 | * | |
132 | * %GFP_KERNEL - Allocate normal kernel ram. May sleep. | |
133 | * | |
134 | * %GFP_ATOMIC - Allocation will not sleep. | |
135 | * For example, use this inside interrupt handlers. | |
136 | * | |
137 | * %GFP_HIGHUSER - Allocate pages from high memory. | |
138 | * | |
139 | * %GFP_NOIO - Do not do any I/O at all while trying to get memory. | |
140 | * | |
141 | * %GFP_NOFS - Do not make any fs calls while trying to get memory. | |
142 | * | |
143 | * Also it is possible to set different flags by OR'ing | |
144 | * in one or more of the following additional @flags: | |
145 | * | |
146 | * %__GFP_COLD - Request cache-cold pages instead of | |
147 | * trying to return cache-warm pages. | |
148 | * | |
149 | * %__GFP_DMA - Request memory from the DMA-capable zone. | |
150 | * | |
151 | * %__GFP_HIGH - This allocation has high priority and may use emergency pools. | |
152 | * | |
153 | * %__GFP_HIGHMEM - Allocated memory may be from highmem. | |
154 | * | |
155 | * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail | |
156 | * (think twice before using). | |
157 | * | |
158 | * %__GFP_NORETRY - If memory is not immediately available, | |
159 | * then give up at once. | |
160 | * | |
161 | * %__GFP_NOWARN - If allocation fails, don't issue any warnings. | |
162 | * | |
163 | * %__GFP_REPEAT - If allocation fails initially, try once more before failing. | |
164 | */ | |
55935a34 | 165 | static inline void *kmalloc(size_t size, gfp_t flags) |
1da177e4 | 166 | { |
1da177e4 LT |
167 | return __kmalloc(size, flags); |
168 | } | |
169 | ||
2e892f43 CL |
170 | /** |
171 | * kzalloc - allocate memory. The memory is set to zero. | |
172 | * @size: how many bytes of memory are required. | |
173 | * @flags: the type of memory to allocate (see kmalloc). | |
174 | */ | |
55935a34 | 175 | static inline void *kzalloc(size_t size, gfp_t flags) |
2e892f43 CL |
176 | { |
177 | return __kzalloc(size, flags); | |
178 | } | |
179 | #endif | |
180 | ||
55935a34 CL |
181 | #ifndef CONFIG_NUMA |
182 | static inline void *kmalloc_node(size_t size, gfp_t flags, int node) | |
183 | { | |
184 | return kmalloc(size, flags); | |
185 | } | |
186 | ||
187 | static inline void *__kmalloc_node(size_t size, gfp_t flags, int node) | |
188 | { | |
189 | return __kmalloc(size, flags); | |
190 | } | |
191 | #endif /* !CONFIG_NUMA */ | |
192 | ||
1d2c8eea CH |
193 | /* |
194 | * kmalloc_track_caller is a special version of kmalloc that records the | |
195 | * calling function of the routine calling it for slab leak tracking instead | |
196 | * of just the calling function (confusing, eh?). | |
197 | * It's useful when the call to kmalloc comes from a widely-used standard | |
198 | * allocator where we care about the real place the memory allocation | |
199 | * request comes from. | |
200 | */ | |
81819f0f | 201 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) |
1d2c8eea CH |
202 | extern void *__kmalloc_track_caller(size_t, gfp_t, void*); |
203 | #define kmalloc_track_caller(size, flags) \ | |
204 | __kmalloc_track_caller(size, flags, __builtin_return_address(0)) | |
2e892f43 CL |
205 | #else |
206 | #define kmalloc_track_caller(size, flags) \ | |
207 | __kmalloc(size, flags) | |
208 | #endif /* DEBUG_SLAB */ | |
1da177e4 | 209 | |
97e2bde4 | 210 | #ifdef CONFIG_NUMA |
8b98c169 CH |
211 | /* |
212 | * kmalloc_node_track_caller is a special version of kmalloc_node that | |
213 | * records the calling function of the routine calling it for slab leak | |
214 | * tracking instead of just the calling function (confusing, eh?). | |
215 | * It's useful when the call to kmalloc_node comes from a widely-used | |
216 | * standard allocator where we care about the real place the memory | |
217 | * allocation request comes from. | |
218 | */ | |
81819f0f | 219 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) |
8b98c169 CH |
220 | extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *); |
221 | #define kmalloc_node_track_caller(size, flags, node) \ | |
222 | __kmalloc_node_track_caller(size, flags, node, \ | |
223 | __builtin_return_address(0)) | |
2e892f43 CL |
224 | #else |
225 | #define kmalloc_node_track_caller(size, flags, node) \ | |
226 | __kmalloc_node(size, flags, node) | |
8b98c169 | 227 | #endif |
2e892f43 | 228 | |
8b98c169 | 229 | #else /* CONFIG_NUMA */ |
8b98c169 CH |
230 | |
231 | #define kmalloc_node_track_caller(size, flags, node) \ | |
232 | kmalloc_track_caller(size, flags) | |
97e2bde4 | 233 | |
55935a34 | 234 | #endif /* DEBUG_SLAB */ |
10cef602 | 235 | |
ac267728 AB |
236 | extern const struct seq_operations slabinfo_op; |
237 | ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *); | |
238 | ||
1da177e4 | 239 | #endif /* __KERNEL__ */ |
1da177e4 | 240 | #endif /* _LINUX_SLAB_H */ |
2e892f43 | 241 |