300 lines
8.9 KiB
C
300 lines
8.9 KiB
C
/*
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* linux/include/linux/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/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_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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#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
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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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#ifndef CONFIG_SLOB
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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 void 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_zalloc(struct kmem_cache *, 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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/* 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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/**
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* kmalloc - allocate memory
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate.
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*
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* kmalloc is the normal method of allocating memory
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* in the kernel.
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*
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* The @flags argument may be one of:
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*
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* %GFP_USER - Allocate memory on behalf of user. May sleep.
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*
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* %GFP_KERNEL - Allocate normal kernel ram. May sleep.
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*
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* %GFP_ATOMIC - Allocation will not sleep.
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* For example, use this inside interrupt handlers.
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*
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* %GFP_HIGHUSER - Allocate pages from high memory.
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*
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* %GFP_NOIO - Do not do any I/O at all while trying to get memory.
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*
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* %GFP_NOFS - Do not make any fs calls while trying to get memory.
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*
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* Also it is possible to set different flags by OR'ing
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* in one or more of the following additional @flags:
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*
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* %__GFP_COLD - Request cache-cold pages instead of
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* trying to return cache-warm pages.
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*
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* %__GFP_DMA - Request memory from the DMA-capable zone.
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*
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* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
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*
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* %__GFP_HIGHMEM - Allocated memory may be from highmem.
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*
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* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
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* (think twice before using).
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*
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* %__GFP_NORETRY - If memory is not immediately available,
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* then give up at once.
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*
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* %__GFP_NOWARN - If allocation fails, don't issue any warnings.
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*
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* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
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*/
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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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/*
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* kmalloc_track_caller is a special version of kmalloc that records the
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* calling function of the routine calling it for slab leak tracking instead
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* of just the calling function (confusing, eh?).
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* It's useful when the call to kmalloc comes from a widely-used standard
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* allocator where we care about the real place the memory allocation
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* request comes from.
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*/
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#ifndef CONFIG_DEBUG_SLAB
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#define kmalloc_track_caller(size, flags) \
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__kmalloc(size, flags)
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#else
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extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
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#define kmalloc_track_caller(size, flags) \
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__kmalloc_track_caller(size, flags, __builtin_return_address(0))
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#endif
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extern void *__kzalloc(size_t, gfp_t);
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/**
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* kzalloc - allocate memory. The memory is set to zero.
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate (see kmalloc).
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*/
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static inline void *kzalloc(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_kzalloc_that_much(void);
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__you_cannot_kzalloc_that_much();
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}
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found:
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return kmem_cache_zalloc((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 __kzalloc(size, flags);
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}
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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 > ULONG_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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extern int slab_is_available(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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static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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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_node((flags & GFP_DMA) ?
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malloc_sizes[i].cs_dmacachep :
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malloc_sizes[i].cs_cachep, flags, node);
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}
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return __kmalloc_node(size, flags, node);
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}
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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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#else /* CONFIG_SLOB */
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/* SLOB allocator routines */
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void kmem_cache_init(void);
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struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
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unsigned long,
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void (*)(void *, struct kmem_cache *, unsigned long),
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void (*)(void *, struct kmem_cache *, unsigned long));
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void kmem_cache_destroy(struct kmem_cache *c);
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void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
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void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
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void kmem_cache_free(struct kmem_cache *c, void *b);
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const char *kmem_cache_name(struct kmem_cache *);
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void *kmalloc(size_t size, gfp_t flags);
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void *__kzalloc(size_t size, gfp_t flags);
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void kfree(const void *m);
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unsigned int ksize(const void *m);
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unsigned int kmem_cache_size(struct kmem_cache *c);
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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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return __kzalloc(n * size, flags);
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}
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#define kmem_cache_shrink(d) (0)
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#define kmem_cache_reap(a)
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#define kmem_ptr_validate(a, b) (0)
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#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
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#define kmalloc_node(s, f, n) kmalloc(s, f)
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#define kzalloc(s, f) __kzalloc(s, f)
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#define kmalloc_track_caller kmalloc
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#endif /* CONFIG_SLOB */
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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 *sighand_cachep;
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extern kmem_cache_t *bio_cachep;
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SLAB_H */
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