X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fslab.h;fp=include%2Flinux%2Fslab.h;h=1ef822e31c774892ffc08d668fd58d357bef5d29;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=8cf52939d0ab676698083140e8cb80384ee6b263;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/include/linux/slab.h b/include/linux/slab.h index 8cf52939d..1ef822e31 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -1,114 +1,79 @@ /* - * linux/mm/slab.h - * Written by Mark Hemment, 1996. - * (markhe@nextd.demon.co.uk) + * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk). + * + * (C) SGI 2006, Christoph Lameter + * Cleaned up and restructured to ease the addition of alternative + * implementations of SLAB allocators. */ #ifndef _LINUX_SLAB_H #define _LINUX_SLAB_H -#if defined(__KERNEL__) +#ifdef __KERNEL__ -typedef struct kmem_cache kmem_cache_t; +#include +#include -#include /* kmalloc_sizes.h needs CONFIG_ options */ -#include -#include -#include -#include /* kmalloc_sizes.h needs PAGE_SIZE */ -#include /* kmalloc_sizes.h needs L1_CACHE_BYTES */ +typedef struct kmem_cache kmem_cache_t __deprecated; -/* flags for kmem_cache_alloc() */ -#define SLAB_NOFS GFP_NOFS -#define SLAB_NOIO GFP_NOIO -#define SLAB_ATOMIC GFP_ATOMIC -#define SLAB_USER GFP_USER -#define SLAB_KERNEL GFP_KERNEL -#define SLAB_DMA GFP_DMA - -#define SLAB_LEVEL_MASK GFP_LEVEL_MASK - -#define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */ +/* + * Flags to pass to kmem_cache_create(). + * The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set. + */ +#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */ +#define SLAB_DEBUG_INITIAL 0x00000200UL /* DEBUG: Call constructor (as verifier) */ +#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */ +#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */ +#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */ +#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */ +#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* Force alignment even if debuggin is active */ +#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */ +#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */ +#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */ +#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */ +#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */ + +/* Flags passed to a constructor functions */ +#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* If not set, then deconstructor */ +#define SLAB_CTOR_ATOMIC 0x002UL /* Tell constructor it can't sleep */ +#define SLAB_CTOR_VERIFY 0x004UL /* Tell constructor it's a verify call */ -/* flags to pass to kmem_cache_create(). - * The first 3 are only valid when the allocator as been build - * SLAB_DEBUG_SUPPORT. +/* + * struct kmem_cache related prototypes */ -#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */ -#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */ -#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */ -#define SLAB_POISON 0x00000800UL /* Poison objects */ -#define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */ -#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */ -#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */ -#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */ -#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */ -#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate - what is reclaimable later*/ -#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */ -#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */ - -/* flags passed to a constructor func */ -#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */ -#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */ -#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */ - -#ifndef CONFIG_SLOB - -/* prototypes */ -extern void __init kmem_cache_init(void); - -extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long, - void (*)(void *, kmem_cache_t *, unsigned long), - void (*)(void *, kmem_cache_t *, unsigned long)); -extern int kmem_cache_destroy(kmem_cache_t *); -extern int kmem_cache_shrink(kmem_cache_t *); -extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t); -extern void kmem_cache_free(kmem_cache_t *, void *); -extern unsigned int kmem_cache_size(kmem_cache_t *); -extern const char *kmem_cache_name(kmem_cache_t *); -extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags); - -/* Size description struct for general caches. */ -struct cache_sizes { - size_t cs_size; - kmem_cache_t *cs_cachep; - kmem_cache_t *cs_dmacachep; -}; -extern struct cache_sizes malloc_sizes[]; - -#ifndef CONFIG_DEBUG_SLAB -extern void *__kmalloc(size_t, gfp_t); -#else -extern void *__kmalloc_track_caller(size_t, gfp_t, void*); -#define __kmalloc(size, flags) \ - __kmalloc_track_caller(size, flags, __builtin_return_address(0)) -#endif +void __init kmem_cache_init(void); +extern int slab_is_available(void); + +struct kmem_cache *kmem_cache_create(const char *, size_t, size_t, + unsigned long, + void (*)(void *, struct kmem_cache *, unsigned long), + void (*)(void *, struct kmem_cache *, unsigned long)); +void kmem_cache_destroy(struct kmem_cache *); +int kmem_cache_shrink(struct kmem_cache *); +void *kmem_cache_alloc(struct kmem_cache *, gfp_t); +void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); +void kmem_cache_free(struct kmem_cache *, void *); +unsigned int kmem_cache_size(struct kmem_cache *); +const char *kmem_cache_name(struct kmem_cache *); +int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr); -static inline void *kmalloc(size_t size, gfp_t flags) +#ifdef CONFIG_NUMA +extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); +#else +static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep, + gfp_t flags, int node) { - if (__builtin_constant_p(size)) { - int i = 0; -#define CACHE(x) \ - if (size <= x) \ - goto found; \ - else \ - i++; -#include "kmalloc_sizes.h" -#undef CACHE - { - extern void __you_cannot_kmalloc_that_much(void); - __you_cannot_kmalloc_that_much(); - } -found: - return kmem_cache_alloc((flags & GFP_DMA) ? - malloc_sizes[i].cs_dmacachep : - malloc_sizes[i].cs_cachep, flags); - } - return __kmalloc(size, flags); + return kmem_cache_alloc(cachep, flags); } +#endif -extern void *kzalloc(size_t, gfp_t); +/* + * Common kmalloc functions provided by all allocators + */ +void *__kmalloc(size_t, gfp_t); +void *__kzalloc(size_t, gfp_t); +void kfree(const void *); +unsigned int ksize(const void *); /** * kcalloc - allocate memory for an array. The memory is set to zero. @@ -118,76 +83,141 @@ extern void *kzalloc(size_t, gfp_t); */ static inline void *kcalloc(size_t n, size_t size, gfp_t flags) { - if (n != 0 && size > INT_MAX / n) + if (n != 0 && size > ULONG_MAX / n) return NULL; - return kzalloc(n * size, flags); + return __kzalloc(n * size, flags); } -extern void kfree(const void *); -extern unsigned int ksize(const void *); +/* + * Allocator specific definitions. These are mainly used to establish optimized + * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by selecting + * the appropriate general cache at compile time. + */ -#ifdef CONFIG_NUMA -extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); -extern void *kmalloc_node(size_t size, gfp_t flags, int node); +#ifdef CONFIG_SLAB +#include #else -static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node) +/* + * Fallback definitions for an allocator not wanting to provide + * its own optimized kmalloc definitions (like SLOB). + */ + +/** + * kmalloc - allocate memory + * @size: how many bytes of memory are required. + * @flags: the type of memory to allocate. + * + * kmalloc is the normal method of allocating memory + * in the kernel. + * + * The @flags argument may be one of: + * + * %GFP_USER - Allocate memory on behalf of user. May sleep. + * + * %GFP_KERNEL - Allocate normal kernel ram. May sleep. + * + * %GFP_ATOMIC - Allocation will not sleep. + * For example, use this inside interrupt handlers. + * + * %GFP_HIGHUSER - Allocate pages from high memory. + * + * %GFP_NOIO - Do not do any I/O at all while trying to get memory. + * + * %GFP_NOFS - Do not make any fs calls while trying to get memory. + * + * Also it is possible to set different flags by OR'ing + * in one or more of the following additional @flags: + * + * %__GFP_COLD - Request cache-cold pages instead of + * trying to return cache-warm pages. + * + * %__GFP_DMA - Request memory from the DMA-capable zone. + * + * %__GFP_HIGH - This allocation has high priority and may use emergency pools. + * + * %__GFP_HIGHMEM - Allocated memory may be from highmem. + * + * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail + * (think twice before using). + * + * %__GFP_NORETRY - If memory is not immediately available, + * then give up at once. + * + * %__GFP_NOWARN - If allocation fails, don't issue any warnings. + * + * %__GFP_REPEAT - If allocation fails initially, try once more before failing. + */ +static inline void *kmalloc(size_t size, gfp_t flags) { - return kmem_cache_alloc(cachep, flags); + return __kmalloc(size, flags); } -static inline void *kmalloc_node(size_t size, gfp_t flags, int node) + +/** + * kzalloc - allocate memory. The memory is set to zero. + * @size: how many bytes of memory are required. + * @flags: the type of memory to allocate (see kmalloc). + */ +static inline void *kzalloc(size_t size, gfp_t flags) { - return kmalloc(size, flags); + return __kzalloc(size, flags); } #endif -extern int FASTCALL(kmem_cache_reap(int)); -extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); - -#else /* CONFIG_SLOB */ - -/* SLOB allocator routines */ - -void kmem_cache_init(void); -struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags); -struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t, - unsigned long, - void (*)(void *, struct kmem_cache *, unsigned long), - void (*)(void *, struct kmem_cache *, unsigned long)); -int kmem_cache_destroy(struct kmem_cache *c); -void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags); -void kmem_cache_free(struct kmem_cache *c, void *b); -const char *kmem_cache_name(struct kmem_cache *); -void *kmalloc(size_t size, gfp_t flags); -void *kzalloc(size_t size, gfp_t flags); -void kfree(const void *m); -unsigned int ksize(const void *m); -unsigned int kmem_cache_size(struct kmem_cache *c); +#ifndef CONFIG_NUMA +static inline void *kmalloc_node(size_t size, gfp_t flags, int node) +{ + return kmalloc(size, flags); +} -static inline void *kcalloc(size_t n, size_t size, gfp_t flags) +static inline void *__kmalloc_node(size_t size, gfp_t flags, int node) { - return kzalloc(n * size, flags); + return __kmalloc(size, flags); } +#endif /* !CONFIG_NUMA */ + +/* + * kmalloc_track_caller is a special version of kmalloc that records the + * calling function of the routine calling it for slab leak tracking instead + * of just the calling function (confusing, eh?). + * It's useful when the call to kmalloc comes from a widely-used standard + * allocator where we care about the real place the memory allocation + * request comes from. + */ +#ifdef CONFIG_DEBUG_SLAB +extern void *__kmalloc_track_caller(size_t, gfp_t, void*); +#define kmalloc_track_caller(size, flags) \ + __kmalloc_track_caller(size, flags, __builtin_return_address(0)) +#else +#define kmalloc_track_caller(size, flags) \ + __kmalloc(size, flags) +#endif /* DEBUG_SLAB */ -#define kmem_cache_shrink(d) (0) -#define kmem_cache_reap(a) -#define kmem_ptr_validate(a, b) (0) -#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f) -#define kmalloc_node(s, f, n) kmalloc(s, f) +#ifdef CONFIG_NUMA +/* + * kmalloc_node_track_caller is a special version of kmalloc_node that + * records the calling function of the routine calling it for slab leak + * tracking instead of just the calling function (confusing, eh?). + * It's useful when the call to kmalloc_node comes from a widely-used + * standard allocator where we care about the real place the memory + * allocation request comes from. + */ +#ifdef CONFIG_DEBUG_SLAB +extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *); +#define kmalloc_node_track_caller(size, flags, node) \ + __kmalloc_node_track_caller(size, flags, node, \ + __builtin_return_address(0)) +#else +#define kmalloc_node_track_caller(size, flags, node) \ + __kmalloc_node(size, flags, node) +#endif -#endif /* CONFIG_SLOB */ +#else /* CONFIG_NUMA */ -/* System wide caches */ -extern kmem_cache_t *vm_area_cachep; -extern kmem_cache_t *names_cachep; -extern kmem_cache_t *files_cachep; -extern kmem_cache_t *filp_cachep; -extern kmem_cache_t *fs_cachep; -extern kmem_cache_t *signal_cachep; -extern kmem_cache_t *sighand_cachep; -extern kmem_cache_t *bio_cachep; +#define kmalloc_node_track_caller(size, flags, node) \ + kmalloc_track_caller(size, flags) -extern atomic_t slab_reclaim_pages; +#endif /* DEBUG_SLAB */ #endif /* __KERNEL__ */ - #endif /* _LINUX_SLAB_H */ +