[mirror_ubuntu-artful-kernel.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 {
/* 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;

	/*
	 * 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
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 {
24755e2e	11	/* 1) Cache tunables. Protected by slab_mutex */
8eae985f PE	12	unsigned int batchcount;
	13	unsigned int limit;
	14	unsigned int shared;
	15
3b0efdfa	16	unsigned int size;
809fa972	17	struct reciprocal_value reciprocal_buffer_size;
b56efcf0	18	/* 2) touched by every alloc & free from the backend */
8eae985f PE	19
	20	unsigned int flags; /* constant flags */
	21	unsigned int num; /* # of objs per slab */
	22
b56efcf0	23	/* 3) cache_grow/shrink */
8eae985f PE	24	/* order of pgs per slab (2^n) */
	25	unsigned int gfporder;
	26
	27	/* force GFP flags, e.g. GFP_DMA */
a618e89f	28	gfp_t allocflags;
8eae985f PE	29
	30	size_t colour; /* cache colouring range */
	31	unsigned int colour_off; /* colour offset */
8456a648 JK	32	struct kmem_cache *freelist_cache;
8456a648 JK	33	unsigned int freelist_size;
8eae985f PE	34
	35	/* constructor func */
	36	void (ctor)(void obj);
	37
b56efcf0	38	/* 4) cache creation/removal */
8eae985f	39	const char *name;
3b0efdfa CL	40	struct list_head list;
	41	int refcount;
	42	int object_size;
	43	int align;
8eae985f	44
b56efcf0	45	/* 5) statistics */
8eae985f PE	46	#ifdef CONFIG_DEBUG_SLAB
	47	unsigned long num_active;
	48	unsigned long num_allocations;
	49	unsigned long high_mark;
	50	unsigned long grown;
	51	unsigned long reaped;
	52	unsigned long errors;
	53	unsigned long max_freeable;
	54	unsigned long node_allocs;
	55	unsigned long node_frees;
	56	unsigned long node_overflow;
	57	atomic_t allochit;
	58	atomic_t allocmiss;
	59	atomic_t freehit;
	60	atomic_t freemiss;
	61
	62	/*
	63	* If debugging is enabled, then the allocator can add additional
3b0efdfa	64	* fields and/or padding to every object. size contains the total
8eae985f PE	65	* object size including these internal fields, the following two
	66	* variables contain the offset to the user object and its size.
	67	*/
	68	int obj_offset;
8eae985f	69	#endif /* CONFIG_DEBUG_SLAB */
ba6c496e GC	70	#ifdef CONFIG_MEMCG_KMEM
	71	struct memcg_cache_params *memcg_params;
	72	#endif
8eae985f	73
b56efcf0	74	/* 6) per-cpu/per-node data, touched during every alloc/free */
8eae985f	75	/*
b56efcf0 ED	76	* We put array[] at the end of kmem_cache, because we want to size
b56efcf0 ED	77	* this array to nr_cpu_ids slots instead of NR_CPUS
8eae985f	78	* (see kmem_cache_init())
b56efcf0 ED	79	* We still use [NR_CPUS] and not [1] or [0] because cache_cache
b56efcf0 ED	80	* is statically defined, so we reserve the max number of cpus.
3c583465 CL	81	*
	82	* We also need to guarantee that the list is able to accomodate a
	83	* pointer for each node since "nodelists" uses the remainder of
	84	* available pointers.
8eae985f	85	*/
6a67368c	86	struct kmem_cache_node **node;
3c583465	87	struct array_cache *array[NR_CPUS + MAX_NUMNODES];
8eae985f	88	/*
b56efcf0	89	* Do not add fields after array[]
8eae985f PE	90	*/
	91	};
	92
2e892f43	93	#endif /* _LINUX_SLAB_DEF_H */