[linux-2.6-block.git] / include / linux / slab_def.h

#ifndef _LINUX_SLAB_DEF_H
#define	_LINUX_SLAB_DEF_H

#include <linux/reciprocal_div.h>

/*
 * Definitions unique to the original Linux SLAB allocator.
 */

struct kmem_cache {
	struct array_cache __percpu *cpu_cache;

/* 1) Cache tunables. Protected by slab_mutex */
	unsigned int batchcount;
	unsigned int limit;
	unsigned int shared;

	unsigned int size;
	struct reciprocal_value reciprocal_buffer_size;
/* 2) touched by every alloc & free from the backend */

	unsigned int flags;		/* constant flags */
	unsigned int num;		/* # of objs per slab */

/* 3) cache_grow/shrink */
	/* order of pgs per slab (2^n) */
	unsigned int gfporder;

	/* force GFP flags, e.g. GFP_DMA */
	gfp_t allocflags;

	size_t colour;			/* cache colouring range */
	unsigned int colour_off;	/* colour offset */
	struct kmem_cache *freelist_cache;
	unsigned int freelist_size;

	/* constructor func */
	void (*ctor)(void *obj);

/* 4) cache creation/removal */
	const char *name;
	struct list_head list;
	int refcount;
	int object_size;
	int align;

/* 5) statistics */
#ifdef CONFIG_DEBUG_SLAB
	unsigned long num_active;
	unsigned long num_allocations;
	unsigned long high_mark;
	unsigned long grown;
	unsigned long reaped;
	unsigned long errors;
	unsigned long max_freeable;
	unsigned long node_allocs;
	unsigned long node_frees;
	unsigned long node_overflow;
	atomic_t allochit;
	atomic_t allocmiss;
	atomic_t freehit;
	atomic_t freemiss;
#ifdef CONFIG_DEBUG_SLAB_LEAK
	atomic_t store_user_clean;
#endif

	/*
	 * If debugging is enabled, then the allocator can add additional
	 * fields and/or padding to every object. size contains the total
	 * object size including these internal fields, the following two
	 * variables contain the offset to the user object and its size.
	 */
	int obj_offset;
#endif /* CONFIG_DEBUG_SLAB */

#ifdef CONFIG_MEMCG
	struct memcg_cache_params memcg_params;
#endif
#ifdef CONFIG_KASAN
	struct kasan_cache kasan_info;
#endif

	struct kmem_cache_node *node[MAX_NUMNODES];
};

static inline void *nearest_obj(struct kmem_cache *cache, struct page *page,
				void *x) {
	void *object = x - (x - page->s_mem) % cache->size;
	void *last_object = page->s_mem + (cache->num - 1) * cache->size;

	if (unlikely(object > last_object))
		return last_object;
	else
		return object;
}

#endif	/* _LINUX_SLAB_DEF_H */
Commit	Line	Data
2e892f43 CL	1	#ifndef _LINUX_SLAB_DEF_H
	2	#define _LINUX_SLAB_DEF_H
	3
809fa972 HFS	4	#include <linux/reciprocal_div.h>
809fa972 HFS	5
2e892f43 CL	6	/*
2e892f43 CL	7	* Definitions unique to the original Linux SLAB allocator.
8eae985f PE	8	*/
	9
	10	struct kmem_cache {
bf0dea23 JK	11	struct array_cache __percpu *cpu_cache;
bf0dea23 JK	12
24755e2e	13	/* 1) Cache tunables. Protected by slab_mutex */
8eae985f PE	14	unsigned int batchcount;
	15	unsigned int limit;
	16	unsigned int shared;
	17
3b0efdfa	18	unsigned int size;
809fa972	19	struct reciprocal_value reciprocal_buffer_size;
b56efcf0	20	/* 2) touched by every alloc & free from the backend */
8eae985f PE	21
	22	unsigned int flags; /* constant flags */
	23	unsigned int num; /* # of objs per slab */
	24
b56efcf0	25	/* 3) cache_grow/shrink */
8eae985f PE	26	/* order of pgs per slab (2^n) */
	27	unsigned int gfporder;
	28
	29	/* force GFP flags, e.g. GFP_DMA */
a618e89f	30	gfp_t allocflags;
8eae985f PE	31
	32	size_t colour; /* cache colouring range */
	33	unsigned int colour_off; /* colour offset */
8456a648 JK	34	struct kmem_cache *freelist_cache;
8456a648 JK	35	unsigned int freelist_size;
8eae985f PE	36
	37	/* constructor func */
	38	void (ctor)(void obj);
	39
b56efcf0	40	/* 4) cache creation/removal */
8eae985f	41	const char *name;
3b0efdfa CL	42	struct list_head list;
	43	int refcount;
	44	int object_size;
	45	int align;
8eae985f	46
b56efcf0	47	/* 5) statistics */
8eae985f PE	48	#ifdef CONFIG_DEBUG_SLAB
	49	unsigned long num_active;
	50	unsigned long num_allocations;
	51	unsigned long high_mark;
	52	unsigned long grown;
	53	unsigned long reaped;
	54	unsigned long errors;
	55	unsigned long max_freeable;
	56	unsigned long node_allocs;
	57	unsigned long node_frees;
	58	unsigned long node_overflow;
	59	atomic_t allochit;
	60	atomic_t allocmiss;
	61	atomic_t freehit;
	62	atomic_t freemiss;
d31676df JK	63	#ifdef CONFIG_DEBUG_SLAB_LEAK
	64	atomic_t store_user_clean;
	65	#endif
8eae985f PE	66
	67	/*
	68	* If debugging is enabled, then the allocator can add additional
3b0efdfa	69	* fields and/or padding to every object. size contains the total
8eae985f PE	70	* object size including these internal fields, the following two
	71	* variables contain the offset to the user object and its size.
	72	*/
	73	int obj_offset;
8eae985f	74	#endif /* CONFIG_DEBUG_SLAB */
127424c8 JW	75
127424c8 JW	76	#ifdef CONFIG_MEMCG
f7ce3190	77	struct memcg_cache_params memcg_params;
ba6c496e	78	#endif
7ed2f9e6 AP	79	#ifdef CONFIG_KASAN
	80	struct kasan_cache kasan_info;
	81	#endif
8eae985f	82
bf0dea23	83	struct kmem_cache_node *node[MAX_NUMNODES];
8eae985f PE	84	};
8eae985f PE	85
7ed2f9e6 AP	86	static inline void nearest_obj(struct kmem_cache cache, struct page *page,
	87	void *x) {
	88	void *object = x - (x - page->s_mem) % cache->size;
	89	void last_object = page->s_mem + (cache->num - 1) cache->size;
	90
	91	if (unlikely(object > last_object))
	92	return last_object;
	93	else
	94	return object;
	95	}
	96
2e892f43	97	#endif /* _LINUX_SLAB_DEF_H */