[deliverable/linux.git] / include / linux / slab_def.h

#ifndef _LINUX_SLAB_DEF_H
#define	_LINUX_SLAB_DEF_H

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

struct kmem_cache {
/* 1) Cache tunables. Protected by cache_chain_mutex */
	unsigned int batchcount;
	unsigned int limit;
	unsigned int shared;

	unsigned int size;
	u32 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;

	/*
	 * 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_KMEM
	struct memcg_cache_params *memcg_params;
#endif

/* 6) per-cpu/per-node data, touched during every alloc/free */
	/*
	 * We put array[] at the end of kmem_cache, because we want to size
	 * this array to nr_cpu_ids slots instead of NR_CPUS
	 * (see kmem_cache_init())
	 * We still use [NR_CPUS] and not [1] or [0] because cache_cache
	 * is statically defined, so we reserve the max number of cpus.
	 *
	 * We also need to guarantee that the list is able to accomodate a
	 * pointer for each node since "nodelists" uses the remainder of
	 * available pointers.
	 */
	struct kmem_cache_node **node;
	struct array_cache *array[NR_CPUS + MAX_NUMNODES];
	/*
	 * Do not add fields after array[]
	 */
};

#endif	/* _LINUX_SLAB_DEF_H */
Commit	Line	Data
2e892f43 CL	1	#ifndef _LINUX_SLAB_DEF_H
	2	#define _LINUX_SLAB_DEF_H
	3
	4	/*
	5	* Definitions unique to the original Linux SLAB allocator.
8eae985f PE	6	*/
	7
	8	struct kmem_cache {
b56efcf0	9	/* 1) Cache tunables. Protected by cache_chain_mutex */
8eae985f PE	10	unsigned int batchcount;
	11	unsigned int limit;
	12	unsigned int shared;
	13
3b0efdfa	14	unsigned int size;
8eae985f	15	u32 reciprocal_buffer_size;
b56efcf0	16	/* 2) touched by every alloc & free from the backend */
8eae985f PE	17
	18	unsigned int flags; /* constant flags */
	19	unsigned int num; /* # of objs per slab */
	20
b56efcf0	21	/* 3) cache_grow/shrink */
8eae985f PE	22	/* order of pgs per slab (2^n) */
	23	unsigned int gfporder;
	24
	25	/* force GFP flags, e.g. GFP_DMA */
a618e89f	26	gfp_t allocflags;
8eae985f PE	27
	28	size_t colour; /* cache colouring range */
	29	unsigned int colour_off; /* colour offset */
8456a648 JK	30	struct kmem_cache *freelist_cache;
8456a648 JK	31	unsigned int freelist_size;
8eae985f PE	32
	33	/* constructor func */
	34	void (ctor)(void obj);
	35
b56efcf0	36	/* 4) cache creation/removal */
8eae985f	37	const char *name;
3b0efdfa CL	38	struct list_head list;
	39	int refcount;
	40	int object_size;
	41	int align;
8eae985f	42
b56efcf0	43	/* 5) statistics */
8eae985f PE	44	#ifdef CONFIG_DEBUG_SLAB
	45	unsigned long num_active;
	46	unsigned long num_allocations;
	47	unsigned long high_mark;
	48	unsigned long grown;
	49	unsigned long reaped;
	50	unsigned long errors;
	51	unsigned long max_freeable;
	52	unsigned long node_allocs;
	53	unsigned long node_frees;
	54	unsigned long node_overflow;
	55	atomic_t allochit;
	56	atomic_t allocmiss;
	57	atomic_t freehit;
	58	atomic_t freemiss;
	59
	60	/*
	61	* If debugging is enabled, then the allocator can add additional
3b0efdfa	62	* fields and/or padding to every object. size contains the total
8eae985f PE	63	* object size including these internal fields, the following two
	64	* variables contain the offset to the user object and its size.
	65	*/
	66	int obj_offset;
8eae985f	67	#endif /* CONFIG_DEBUG_SLAB */
ba6c496e GC	68	#ifdef CONFIG_MEMCG_KMEM
	69	struct memcg_cache_params *memcg_params;
	70	#endif
8eae985f	71
b56efcf0	72	/* 6) per-cpu/per-node data, touched during every alloc/free */
8eae985f	73	/*
b56efcf0 ED	74	* We put array[] at the end of kmem_cache, because we want to size
b56efcf0 ED	75	* this array to nr_cpu_ids slots instead of NR_CPUS
8eae985f	76	* (see kmem_cache_init())
b56efcf0 ED	77	* We still use [NR_CPUS] and not [1] or [0] because cache_cache
b56efcf0 ED	78	* is statically defined, so we reserve the max number of cpus.
3c583465 CL	79	*
	80	* We also need to guarantee that the list is able to accomodate a
	81	* pointer for each node since "nodelists" uses the remainder of
	82	* available pointers.
8eae985f	83	*/
6a67368c	84	struct kmem_cache_node **node;
3c583465	85	struct array_cache *array[NR_CPUS + MAX_NUMNODES];
8eae985f	86	/*
b56efcf0	87	* Do not add fields after array[]
8eae985f PE	88	*/
	89	};
	90
2e892f43	91	#endif /* _LINUX_SLAB_DEF_H */