2 * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
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.
14 #include <linux/gfp.h>
15 #include <linux/types.h>
17 typedef struct kmem_cache kmem_cache_t __deprecated;
20 * Flags to pass to kmem_cache_create().
21 * The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
23 #define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
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 */
27 #define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
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 */
32 #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
33 #define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
35 /* Flags passed to a constructor functions */
36 #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* If not set, then deconstructor */
37 #define SLAB_CTOR_ATOMIC 0x002UL /* Tell constructor it can't sleep */
40 * struct kmem_cache related prototypes
42 void __init kmem_cache_init(void);
43 int slab_is_available(void);
45 struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
47 void (*)(void *, struct kmem_cache *, unsigned long),
48 void (*)(void *, struct kmem_cache *, unsigned long));
49 void kmem_cache_destroy(struct kmem_cache *);
50 int kmem_cache_shrink(struct kmem_cache *);
51 void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
52 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
53 void kmem_cache_free(struct kmem_cache *, void *);
54 unsigned int kmem_cache_size(struct kmem_cache *);
55 const char *kmem_cache_name(struct kmem_cache *);
56 int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr);
59 * Please use this macro to create slab caches. Simply specify the
60 * name of the structure and maybe some flags that are listed above.
62 * The alignment of the struct determines object alignment. If you
63 * f.e. add ____cacheline_aligned_in_smp to the struct declaration
64 * then the objects will be properly aligned in SMP configurations.
66 #define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\
67 sizeof(struct __struct), __alignof__(struct __struct),\
68 (__flags), NULL, NULL)
71 extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
73 static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
74 gfp_t flags, int node)
76 return kmem_cache_alloc(cachep, flags);
81 * Common kmalloc functions provided by all allocators
83 void *__kmalloc(size_t, gfp_t);
84 void *__kzalloc(size_t, gfp_t);
85 void * __must_check krealloc(const void *, size_t, gfp_t);
86 void kfree(const void *);
87 size_t ksize(const void *);
90 * kcalloc - allocate memory for an array. The memory is set to zero.
91 * @n: number of elements.
92 * @size: element size.
93 * @flags: the type of memory to allocate.
95 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
97 if (n != 0 && size > ULONG_MAX / n)
99 return __kzalloc(n * size, flags);
103 * Allocator specific definitions. These are mainly used to establish optimized
104 * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by selecting
105 * the appropriate general cache at compile time.
108 #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
110 #include <linux/slub_def.h>
112 #include <linux/slab_def.h>
113 #endif /* !CONFIG_SLUB */
117 * Fallback definitions for an allocator not wanting to provide
118 * its own optimized kmalloc definitions (like SLOB).
122 * kmalloc - allocate memory
123 * @size: how many bytes of memory are required.
124 * @flags: the type of memory to allocate.
126 * kmalloc is the normal method of allocating memory
129 * The @flags argument may be one of:
131 * %GFP_USER - Allocate memory on behalf of user. May sleep.
133 * %GFP_KERNEL - Allocate normal kernel ram. May sleep.
135 * %GFP_ATOMIC - Allocation will not sleep.
136 * For example, use this inside interrupt handlers.
138 * %GFP_HIGHUSER - Allocate pages from high memory.
140 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
142 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
144 * Also it is possible to set different flags by OR'ing
145 * in one or more of the following additional @flags:
147 * %__GFP_COLD - Request cache-cold pages instead of
148 * trying to return cache-warm pages.
150 * %__GFP_DMA - Request memory from the DMA-capable zone.
152 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
154 * %__GFP_HIGHMEM - Allocated memory may be from highmem.
156 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
157 * (think twice before using).
159 * %__GFP_NORETRY - If memory is not immediately available,
160 * then give up at once.
162 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
164 * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
166 static inline void *kmalloc(size_t size, gfp_t flags)
168 return __kmalloc(size, flags);
172 * kzalloc - allocate memory. The memory is set to zero.
173 * @size: how many bytes of memory are required.
174 * @flags: the type of memory to allocate (see kmalloc).
176 static inline void *kzalloc(size_t size, gfp_t flags)
178 return __kzalloc(size, flags);
183 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
185 return kmalloc(size, flags);
188 static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
190 return __kmalloc(size, flags);
192 #endif /* !CONFIG_NUMA */
195 * kmalloc_track_caller is a special version of kmalloc that records the
196 * calling function of the routine calling it for slab leak tracking instead
197 * of just the calling function (confusing, eh?).
198 * It's useful when the call to kmalloc comes from a widely-used standard
199 * allocator where we care about the real place the memory allocation
200 * request comes from.
202 #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB)
203 extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
204 #define kmalloc_track_caller(size, flags) \
205 __kmalloc_track_caller(size, flags, __builtin_return_address(0))
207 #define kmalloc_track_caller(size, flags) \
208 __kmalloc(size, flags)
209 #endif /* DEBUG_SLAB */
213 * kmalloc_node_track_caller is a special version of kmalloc_node that
214 * records the calling function of the routine calling it for slab leak
215 * tracking instead of just the calling function (confusing, eh?).
216 * It's useful when the call to kmalloc_node comes from a widely-used
217 * standard allocator where we care about the real place the memory
218 * allocation request comes from.
220 #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB)
221 extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
222 #define kmalloc_node_track_caller(size, flags, node) \
223 __kmalloc_node_track_caller(size, flags, node, \
224 __builtin_return_address(0))
226 #define kmalloc_node_track_caller(size, flags, node) \
227 __kmalloc_node(size, flags, node)
230 #else /* CONFIG_NUMA */
232 #define kmalloc_node_track_caller(size, flags, node) \
233 kmalloc_track_caller(size, flags)
235 #endif /* DEBUG_SLAB */
237 extern const struct seq_operations slabinfo_op;
238 ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
240 #endif /* __KERNEL__ */
241 #endif /* _LINUX_SLAB_H */