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151 lines
4.7 KiB
151 lines
4.7 KiB
/*
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* linux/mm/slab.h
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* Written by Mark Hemment, 1996.
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* (markhe@nextd.demon.co.uk)
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*/
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#ifndef _LINUX_SLAB_H
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#define _LINUX_SLAB_H
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#if defined(__KERNEL__)
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typedef struct kmem_cache kmem_cache_t;
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#include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
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#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
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/* flags for kmem_cache_alloc() */
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#define SLAB_NOFS GFP_NOFS
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#define SLAB_NOIO GFP_NOIO
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#define SLAB_ATOMIC GFP_ATOMIC
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#define SLAB_USER GFP_USER
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#define SLAB_KERNEL GFP_KERNEL
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#define SLAB_DMA GFP_DMA
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#define SLAB_LEVEL_MASK GFP_LEVEL_MASK
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#define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */
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/* flags to pass to kmem_cache_create().
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* The first 3 are only valid when the allocator as been build
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* SLAB_DEBUG_SUPPORT.
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*/
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#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
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#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
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#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
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#define SLAB_POISON 0x00000800UL /* Poison objects */
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#define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */
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#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
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#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
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#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
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#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
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#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
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what is reclaimable later*/
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#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
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#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
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/* flags passed to a constructor func */
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#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
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#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
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#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
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/* prototypes */
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extern void __init kmem_cache_init(void);
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extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
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void (*)(void *, kmem_cache_t *, unsigned long),
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void (*)(void *, kmem_cache_t *, unsigned long));
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extern int kmem_cache_destroy(kmem_cache_t *);
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extern int kmem_cache_shrink(kmem_cache_t *);
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extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
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extern void kmem_cache_free(kmem_cache_t *, void *);
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extern unsigned int kmem_cache_size(kmem_cache_t *);
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extern const char *kmem_cache_name(kmem_cache_t *);
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extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
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/* Size description struct for general caches. */
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struct cache_sizes {
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size_t cs_size;
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kmem_cache_t *cs_cachep;
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kmem_cache_t *cs_dmacachep;
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};
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extern struct cache_sizes malloc_sizes[];
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extern void *__kmalloc(size_t, gfp_t);
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static inline void *kmalloc(size_t size, gfp_t flags)
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{
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if (__builtin_constant_p(size)) {
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int i = 0;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include "kmalloc_sizes.h"
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#undef CACHE
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{
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extern void __you_cannot_kmalloc_that_much(void);
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__you_cannot_kmalloc_that_much();
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}
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found:
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return kmem_cache_alloc((flags & GFP_DMA) ?
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malloc_sizes[i].cs_dmacachep :
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malloc_sizes[i].cs_cachep, flags);
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}
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return __kmalloc(size, flags);
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}
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extern void *kzalloc(size_t, gfp_t);
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/**
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* kcalloc - allocate memory for an array. The memory is set to zero.
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* @n: number of elements.
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* @size: element size.
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* @flags: the type of memory to allocate.
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*/
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static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
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{
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if (n != 0 && size > INT_MAX / n)
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return NULL;
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return kzalloc(n * size, flags);
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}
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extern void kfree(const void *);
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extern unsigned int ksize(const void *);
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#ifdef CONFIG_NUMA
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extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
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extern void *kmalloc_node(size_t size, gfp_t flags, int node);
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#else
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static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
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{
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return kmem_cache_alloc(cachep, flags);
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}
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static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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return kmalloc(size, flags);
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}
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#endif
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extern int FASTCALL(kmem_cache_reap(int));
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extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
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/* System wide caches */
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extern kmem_cache_t *vm_area_cachep;
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extern kmem_cache_t *names_cachep;
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extern kmem_cache_t *files_cachep;
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extern kmem_cache_t *filp_cachep;
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extern kmem_cache_t *fs_cachep;
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extern kmem_cache_t *signal_cachep;
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extern kmem_cache_t *sighand_cachep;
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extern kmem_cache_t *bio_cachep;
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extern atomic_t slab_reclaim_pages;
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SLAB_H */
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