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

#ifndef _LINUX_SLUB_DEF_H
#define _LINUX_SLUB_DEF_H

/*
 * SLUB : A Slab allocator without object queues.
 *
 * (C) 2007 SGI, Christoph Lameter <clameter@sgi.com>
 */
#include <linux/types.h>
#include <linux/gfp.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>

struct kmem_cache_node {
	spinlock_t list_lock;	/* Protect partial list and nr_partial */
	unsigned long nr_partial;
	atomic_long_t nr_slabs;
	struct list_head partial;
#ifdef CONFIG_SLUB_DEBUG
	struct list_head full;
#endif
};

/*
 * Slab cache management.
 */
struct kmem_cache {
	/* Used for retriving partial slabs etc */
	unsigned long flags;
	int size;		/* The size of an object including meta data */
	int objsize;		/* The size of an object without meta data */
	int offset;		/* Free pointer offset. */
	int order;

	/*
	 * Avoid an extra cache line for UP, SMP and for the node local to
	 * struct kmem_cache.
	 */
	struct kmem_cache_node local_node;

	/* Allocation and freeing of slabs */
	int objects;		/* Number of objects in slab */
	int refcount;		/* Refcount for slab cache destroy */
	void (*ctor)(void *, struct kmem_cache *, unsigned long);
	int inuse;		/* Offset to metadata */
	int align;		/* Alignment */
	const char *name;	/* Name (only for display!) */
	struct list_head list;	/* List of slab caches */
#ifdef CONFIG_SLUB_DEBUG
	struct kobject kobj;	/* For sysfs */
#endif

#ifdef CONFIG_NUMA
	int defrag_ratio;
	struct kmem_cache_node *node[MAX_NUMNODES];
#endif
	struct page *cpu_slab[NR_CPUS];
};

/*
 * Kmalloc subsystem.
 */
#if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8
#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN
#else
#define KMALLOC_MIN_SIZE 8
#endif

#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)

/*
 * We keep the general caches in an array of slab caches that are used for
 * 2^x bytes of allocations.
 */
extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];

/*
 * Sorry that the following has to be that ugly but some versions of GCC
 * have trouble with constant propagation and loops.
 */
static __always_inline int kmalloc_index(size_t size)
{
	if (!size)
		return 0;

	if (size > KMALLOC_MAX_SIZE)
		return -1;

	if (size <= KMALLOC_MIN_SIZE)
		return KMALLOC_SHIFT_LOW;

	if (size > 64 && size <= 96)
		return 1;
	if (size > 128 && size <= 192)
		return 2;
	if (size <=          8) return 3;
	if (size <=         16) return 4;
	if (size <=         32) return 5;
	if (size <=         64) return 6;
	if (size <=        128) return 7;
	if (size <=        256) return 8;
	if (size <=        512) return 9;
	if (size <=       1024) return 10;
	if (size <=   2 * 1024) return 11;
	if (size <=   4 * 1024) return 12;
	if (size <=   8 * 1024) return 13;
	if (size <=  16 * 1024) return 14;
	if (size <=  32 * 1024) return 15;
	if (size <=  64 * 1024) return 16;
	if (size <= 128 * 1024) return 17;
	if (size <= 256 * 1024) return 18;
	if (size <=  512 * 1024) return 19;
	if (size <= 1024 * 1024) return 20;
	if (size <=  2 * 1024 * 1024) return 21;
	if (size <=  4 * 1024 * 1024) return 22;
	if (size <=  8 * 1024 * 1024) return 23;
	if (size <= 16 * 1024 * 1024) return 24;
	if (size <= 32 * 1024 * 1024) return 25;
	return -1;

/*
 * What we really wanted to do and cannot do because of compiler issues is:
 *	int i;
 *	for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
 *		if (size <= (1 << i))
 *			return i;
 */
}

/*
 * Find the slab cache for a given combination of allocation flags and size.
 *
 * This ought to end up with a global pointer to the right cache
 * in kmalloc_caches.
 */
static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
{
	int index = kmalloc_index(size);

	if (index == 0)
		return NULL;

	/*
	 * This function only gets expanded if __builtin_constant_p(size), so
	 * testing it here shouldn't be needed.  But some versions of gcc need
	 * help.
	 */
	if (__builtin_constant_p(size) && index < 0) {
		/*
		 * Generate a link failure. Would be great if we could
		 * do something to stop the compile here.
		 */
		extern void __kmalloc_size_too_large(void);
		__kmalloc_size_too_large();
	}
	return &kmalloc_caches[index];
}

#ifdef CONFIG_ZONE_DMA
#define SLUB_DMA __GFP_DMA
#else
/* Disable DMA functionality */
#define SLUB_DMA (__force gfp_t)0
#endif

void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
void *__kmalloc(size_t size, gfp_t flags);

static __always_inline void *kmalloc(size_t size, gfp_t flags)
{
	if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
		struct kmem_cache *s = kmalloc_slab(size);

		if (!s)
			return ZERO_SIZE_PTR;

		return kmem_cache_alloc(s, flags);
	} else
		return __kmalloc(size, flags);
}

#ifdef CONFIG_NUMA
void *__kmalloc_node(size_t size, gfp_t flags, int node);
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);

static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
	if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
		struct kmem_cache *s = kmalloc_slab(size);

		if (!s)
			return ZERO_SIZE_PTR;

		return kmem_cache_alloc_node(s, flags, node);
	} else
		return __kmalloc_node(size, flags, node);
}
#endif

#endif /* _LINUX_SLUB_DEF_H */
Commit	Line	Data
81819f0f CL	1	#ifndef _LINUX_SLUB_DEF_H
	2	#define _LINUX_SLUB_DEF_H
	3
	4	/*
	5	* SLUB : A Slab allocator without object queues.
	6	*
	7	* (C) 2007 SGI, Christoph Lameter <clameter@sgi.com>
	8	*/
	9	#include <linux/types.h>
	10	#include <linux/gfp.h>
	11	#include <linux/workqueue.h>
	12	#include <linux/kobject.h>
	13
	14	struct kmem_cache_node {
	15	spinlock_t list_lock; /* Protect partial list and nr_partial */
	16	unsigned long nr_partial;
	17	atomic_long_t nr_slabs;
	18	struct list_head partial;
0c710013	19	#ifdef CONFIG_SLUB_DEBUG
643b1138	20	struct list_head full;
0c710013	21	#endif
81819f0f CL	22	};
	23
	24	/*
	25	* Slab cache management.
	26	*/
	27	struct kmem_cache {
	28	/* Used for retriving partial slabs etc */
	29	unsigned long flags;
	30	int size; /* The size of an object including meta data */
	31	int objsize; /* The size of an object without meta data */
	32	int offset; /* Free pointer offset. */
4b356be0	33	int order;
81819f0f CL	34
	35	/*
	36	* Avoid an extra cache line for UP, SMP and for the node local to
	37	* struct kmem_cache.
	38	*/
	39	struct kmem_cache_node local_node;
	40
	41	/* Allocation and freeing of slabs */
	42	int objects; /* Number of objects in slab */
	43	int refcount; /* Refcount for slab cache destroy */
	44	void (ctor)(void , struct kmem_cache *, unsigned long);
81819f0f CL	45	int inuse; /* Offset to metadata */
	46	int align; /* Alignment */
	47	const char name; / Name (only for display!) */
	48	struct list_head list; /* List of slab caches */
0c710013	49	#ifdef CONFIG_SLUB_DEBUG
81819f0f	50	struct kobject kobj; /* For sysfs */
0c710013	51	#endif
81819f0f CL	52
	53	#ifdef CONFIG_NUMA
	54	int defrag_ratio;
	55	struct kmem_cache_node *node[MAX_NUMNODES];
	56	#endif
	57	struct page *cpu_slab[NR_CPUS];
	58	};
	59
	60	/*
	61	* Kmalloc subsystem.
	62	*/
4b356be0 CL	63	#if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8
	64	#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN
	65	#else
	66	#define KMALLOC_MIN_SIZE 8
	67	#endif
	68
	69	#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)
81819f0f	70
81819f0f CL	71	/*
	72	* We keep the general caches in an array of slab caches that are used for
	73	* 2^x bytes of allocations.
	74	*/
	75	extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
	76
	77	/*
	78	* Sorry that the following has to be that ugly but some versions of GCC
	79	* have trouble with constant propagation and loops.
	80	*/
aa137f9d	81	static __always_inline int kmalloc_index(size_t size)
81819f0f	82	{
272c1d21 CL	83	if (!size)
272c1d21 CL	84	return 0;
614410d5	85
0aa817f0	86	if (size > KMALLOC_MAX_SIZE)
cfbf07f2 CL	87	return -1;
cfbf07f2 CL	88
4b356be0 CL	89	if (size <= KMALLOC_MIN_SIZE)
	90	return KMALLOC_SHIFT_LOW;
	91
81819f0f CL	92	if (size > 64 && size <= 96)
	93	return 1;
	94	if (size > 128 && size <= 192)
	95	return 2;
	96	if (size <= 8) return 3;
	97	if (size <= 16) return 4;
	98	if (size <= 32) return 5;
	99	if (size <= 64) return 6;
	100	if (size <= 128) return 7;
	101	if (size <= 256) return 8;
	102	if (size <= 512) return 9;
	103	if (size <= 1024) return 10;
	104	if (size <= 2 * 1024) return 11;
	105	if (size <= 4 * 1024) return 12;
	106	if (size <= 8 * 1024) return 13;
	107	if (size <= 16 * 1024) return 14;
	108	if (size <= 32 * 1024) return 15;
	109	if (size <= 64 * 1024) return 16;
	110	if (size <= 128 * 1024) return 17;
	111	if (size <= 256 * 1024) return 18;
81819f0f CL	112	if (size <= 512 * 1024) return 19;
81819f0f CL	113	if (size <= 1024 * 1024) return 20;
81819f0f CL	114	if (size <= 2 * 1024 * 1024) return 21;
	115	if (size <= 4 * 1024 * 1024) return 22;
	116	if (size <= 8 * 1024 * 1024) return 23;
	117	if (size <= 16 * 1024 * 1024) return 24;
	118	if (size <= 32 * 1024 * 1024) return 25;
81819f0f CL	119	return -1;
	120
	121	/*
	122	* What we really wanted to do and cannot do because of compiler issues is:
	123	* int i;
	124	* for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
	125	* if (size <= (1 << i))
	126	* return i;
	127	*/
	128	}
	129
	130	/*
	131	* Find the slab cache for a given combination of allocation flags and size.
	132	*
	133	* This ought to end up with a global pointer to the right cache
	134	* in kmalloc_caches.
	135	*/
aa137f9d	136	static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
81819f0f CL	137	{
	138	int index = kmalloc_index(size);
	139
	140	if (index == 0)
	141	return NULL;
	142
ade3aff2 AM	143	/*
	144	* This function only gets expanded if __builtin_constant_p(size), so
	145	* testing it here shouldn't be needed. But some versions of gcc need
	146	* help.
	147	*/
	148	if (__builtin_constant_p(size) && index < 0) {
81819f0f CL	149	/*
	150	* Generate a link failure. Would be great if we could
	151	* do something to stop the compile here.
	152	*/
	153	extern void __kmalloc_size_too_large(void);
	154	__kmalloc_size_too_large();
	155	}
	156	return &kmalloc_caches[index];
	157	}
	158
	159	#ifdef CONFIG_ZONE_DMA
	160	#define SLUB_DMA __GFP_DMA
	161	#else
	162	/* Disable DMA functionality */
d046943c	163	#define SLUB_DMA (__force gfp_t)0
81819f0f CL	164	#endif
81819f0f CL	165
6193a2ff PM	166	void kmem_cache_alloc(struct kmem_cache , gfp_t);
	167	void *__kmalloc(size_t size, gfp_t flags);
	168
aa137f9d	169	static __always_inline void *kmalloc(size_t size, gfp_t flags)
81819f0f CL	170	{
	171	if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
	172	struct kmem_cache *s = kmalloc_slab(size);
	173
	174	if (!s)
272c1d21	175	return ZERO_SIZE_PTR;
81819f0f CL	176
	177	return kmem_cache_alloc(s, flags);
	178	} else
	179	return __kmalloc(size, flags);
	180	}
	181
81819f0f	182	#ifdef CONFIG_NUMA
6193a2ff PM	183	void *__kmalloc_node(size_t size, gfp_t flags, int node);
6193a2ff PM	184	void kmem_cache_alloc_node(struct kmem_cache , gfp_t flags, int node);
81819f0f	185
aa137f9d	186	static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
81819f0f CL	187	{
	188	if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
	189	struct kmem_cache *s = kmalloc_slab(size);
	190
	191	if (!s)
272c1d21	192	return ZERO_SIZE_PTR;
81819f0f CL	193
	194	return kmem_cache_alloc_node(s, flags, node);
	195	} else
	196	return __kmalloc_node(size, flags, node);
	197	}
	198	#endif
	199
	200	#endif /* _LINUX_SLUB_DEF_H */