[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>

enum stat_item {
	ALLOC_FASTPATH,		/* Allocation from cpu slab */
	ALLOC_SLOWPATH,		/* Allocation by getting a new cpu slab */
	FREE_FASTPATH,		/* Free to cpu slub */
	FREE_SLOWPATH,		/* Freeing not to cpu slab */
	FREE_FROZEN,		/* Freeing to frozen slab */
	FREE_ADD_PARTIAL,	/* Freeing moves slab to partial list */
	FREE_REMOVE_PARTIAL,	/* Freeing removes last object */
	ALLOC_FROM_PARTIAL,	/* Cpu slab acquired from partial list */
	ALLOC_SLAB,		/* Cpu slab acquired from page allocator */
	ALLOC_REFILL,		/* Refill cpu slab from slab freelist */
	FREE_SLAB,		/* Slab freed to the page allocator */
	CPUSLAB_FLUSH,		/* Abandoning of the cpu slab */
	DEACTIVATE_FULL,	/* Cpu slab was full when deactivated */
	DEACTIVATE_EMPTY,	/* Cpu slab was empty when deactivated */
	DEACTIVATE_TO_HEAD,	/* Cpu slab was moved to the head of partials */
	DEACTIVATE_TO_TAIL,	/* Cpu slab was moved to the tail of partials */
	DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
	NR_SLUB_STAT_ITEMS };

struct kmem_cache_cpu {
	void **freelist;	/* Pointer to first free per cpu object */
	struct page *page;	/* The slab from which we are allocating */
	int node;		/* The node of the page (or -1 for debug) */
	unsigned int offset;	/* Freepointer offset (in word units) */
	unsigned int objsize;	/* Size of an object (from kmem_cache) */
#ifdef CONFIG_SLUB_STATS
	unsigned stat[NR_SLUB_STAT_ITEMS];
#endif
};

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;		/* Current preferred allocation 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 */
	gfp_t allocflags;	/* gfp flags to use on each alloc */
	int refcount;		/* Refcount for slab cache destroy */
	void (*ctor)(struct kmem_cache *, void *);
	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
	/*
	 * Defragmentation by allocating from a remote node.
	 */
	int remote_node_defrag_ratio;
	struct kmem_cache_node *node[MAX_NUMNODES];
#endif
#ifdef CONFIG_SMP
	struct kmem_cache_cpu *cpu_slab[NR_CPUS];
#else
	struct kmem_cache_cpu cpu_slab;
#endif
};

/*
 * 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[PAGE_SHIFT + 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_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;
/*
 * The following is only needed to support architectures with a larger page
 * size than 4k.
 */
	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;
	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;

	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_large(size_t size, gfp_t flags)
{
	return (void *)__get_free_pages(flags | __GFP_COMP, get_order(size));
}

static __always_inline void *kmalloc(size_t size, gfp_t flags)
{
	if (__builtin_constant_p(size)) {
		if (size > PAGE_SIZE)
			return kmalloc_large(size, flags);

		if (!(flags & SLUB_DMA)) {
			struct kmem_cache *s = kmalloc_slab(size);

			if (!s)
				return ZERO_SIZE_PTR;

			return kmem_cache_alloc(s, flags);
		}
	}
	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) &&
		size <= PAGE_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);
	}
	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
8ff12cfc CL	14	enum stat_item {
	15	ALLOC_FASTPATH, /* Allocation from cpu slab */
	16	ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
	17	FREE_FASTPATH, /* Free to cpu slub */
	18	FREE_SLOWPATH, /* Freeing not to cpu slab */
	19	FREE_FROZEN, /* Freeing to frozen slab */
	20	FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
	21	FREE_REMOVE_PARTIAL, /* Freeing removes last object */
	22	ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
	23	ALLOC_SLAB, /* Cpu slab acquired from page allocator */
	24	ALLOC_REFILL, /* Refill cpu slab from slab freelist */
	25	FREE_SLAB, /* Slab freed to the page allocator */
	26	CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
	27	DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
	28	DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
	29	DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
	30	DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
	31	DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
	32	NR_SLUB_STAT_ITEMS };
	33
dfb4f096	34	struct kmem_cache_cpu {
da89b79e CL	35	void *freelist; / Pointer to first free per cpu object */
	36	struct page page; / The slab from which we are allocating */
	37	int node; /* The node of the page (or -1 for debug) */
	38	unsigned int offset; /* Freepointer offset (in word units) */
	39	unsigned int objsize; /* Size of an object (from kmem_cache) */
8ff12cfc CL	40	#ifdef CONFIG_SLUB_STATS
	41	unsigned stat[NR_SLUB_STAT_ITEMS];
	42	#endif
4c93c355	43	};
dfb4f096	44
81819f0f CL	45	struct kmem_cache_node {
	46	spinlock_t list_lock; /* Protect partial list and nr_partial */
	47	unsigned long nr_partial;
	48	atomic_long_t nr_slabs;
	49	struct list_head partial;
0c710013	50	#ifdef CONFIG_SLUB_DEBUG
643b1138	51	struct list_head full;
0c710013	52	#endif
81819f0f CL	53	};
	54
	55	/*
	56	* Slab cache management.
	57	*/
	58	struct kmem_cache {
	59	/* Used for retriving partial slabs etc */
	60	unsigned long flags;
	61	int size; /* The size of an object including meta data */
	62	int objsize; /* The size of an object without meta data */
	63	int offset; /* Free pointer offset. */
6446faa2	64	int order; /* Current preferred allocation order */
81819f0f CL	65
	66	/*
	67	* Avoid an extra cache line for UP, SMP and for the node local to
	68	* struct kmem_cache.
	69	*/
	70	struct kmem_cache_node local_node;
	71
	72	/* Allocation and freeing of slabs */
	73	int objects; /* Number of objects in slab */
b7a49f0d	74	gfp_t allocflags; /* gfp flags to use on each alloc */
81819f0f	75	int refcount; /* Refcount for slab cache destroy */
4ba9b9d0	76	void (ctor)(struct kmem_cache , void *);
81819f0f CL	77	int inuse; /* Offset to metadata */
	78	int align; /* Alignment */
	79	const char name; / Name (only for display!) */
	80	struct list_head list; /* List of slab caches */
0c710013	81	#ifdef CONFIG_SLUB_DEBUG
81819f0f	82	struct kobject kobj; /* For sysfs */
0c710013	83	#endif
81819f0f CL	84
81819f0f CL	85	#ifdef CONFIG_NUMA
9824601e CL	86	/*
	87	* Defragmentation by allocating from a remote node.
	88	*/
	89	int remote_node_defrag_ratio;
81819f0f CL	90	struct kmem_cache_node *node[MAX_NUMNODES];
81819f0f CL	91	#endif
4c93c355 CL	92	#ifdef CONFIG_SMP
	93	struct kmem_cache_cpu *cpu_slab[NR_CPUS];
	94	#else
	95	struct kmem_cache_cpu cpu_slab;
	96	#endif
81819f0f CL	97	};
	98
	99	/*
	100	* Kmalloc subsystem.
	101	*/
4b356be0 CL	102	#if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8
	103	#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN
	104	#else
	105	#define KMALLOC_MIN_SIZE 8
	106	#endif
	107
	108	#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)
81819f0f	109
81819f0f CL	110	/*
	111	* We keep the general caches in an array of slab caches that are used for
	112	* 2^x bytes of allocations.
	113	*/
331dc558	114	extern struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1];
81819f0f CL	115
	116	/*
	117	* Sorry that the following has to be that ugly but some versions of GCC
	118	* have trouble with constant propagation and loops.
	119	*/
aa137f9d	120	static __always_inline int kmalloc_index(size_t size)
81819f0f	121	{
272c1d21 CL	122	if (!size)
272c1d21 CL	123	return 0;
614410d5	124
4b356be0 CL	125	if (size <= KMALLOC_MIN_SIZE)
	126	return KMALLOC_SHIFT_LOW;
	127
81819f0f CL	128	if (size > 64 && size <= 96)
	129	return 1;
	130	if (size > 128 && size <= 192)
	131	return 2;
	132	if (size <= 8) return 3;
	133	if (size <= 16) return 4;
	134	if (size <= 32) return 5;
	135	if (size <= 64) return 6;
	136	if (size <= 128) return 7;
	137	if (size <= 256) return 8;
	138	if (size <= 512) return 9;
	139	if (size <= 1024) return 10;
	140	if (size <= 2 * 1024) return 11;
6446faa2	141	if (size <= 4 * 1024) return 12;
aadb4bc4 CL	142	/*
	143	* The following is only needed to support architectures with a larger page
	144	* size than 4k.
	145	*/
81819f0f CL	146	if (size <= 8 * 1024) return 13;
	147	if (size <= 16 * 1024) return 14;
	148	if (size <= 32 * 1024) return 15;
	149	if (size <= 64 * 1024) return 16;
	150	if (size <= 128 * 1024) return 17;
	151	if (size <= 256 * 1024) return 18;
aadb4bc4	152	if (size <= 512 * 1024) return 19;
81819f0f	153	if (size <= 1024 * 1024) return 20;
81819f0f	154	if (size <= 2 * 1024 * 1024) return 21;
81819f0f CL	155	return -1;
	156
	157	/*
	158	* What we really wanted to do and cannot do because of compiler issues is:
	159	* int i;
	160	* for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
	161	* if (size <= (1 << i))
	162	* return i;
	163	*/
	164	}
	165
	166	/*
	167	* Find the slab cache for a given combination of allocation flags and size.
	168	*
	169	* This ought to end up with a global pointer to the right cache
	170	* in kmalloc_caches.
	171	*/
aa137f9d	172	static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
81819f0f CL	173	{
	174	int index = kmalloc_index(size);
	175
	176	if (index == 0)
	177	return NULL;
	178
81819f0f CL	179	return &kmalloc_caches[index];
	180	}
	181
	182	#ifdef CONFIG_ZONE_DMA
	183	#define SLUB_DMA __GFP_DMA
	184	#else
	185	/* Disable DMA functionality */
d046943c	186	#define SLUB_DMA (__force gfp_t)0
81819f0f CL	187	#endif
81819f0f CL	188
6193a2ff PM	189	void kmem_cache_alloc(struct kmem_cache , gfp_t);
	190	void *__kmalloc(size_t size, gfp_t flags);
	191
eada35ef PE	192	static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
	193	{
	194	return (void *)__get_free_pages(flags \| __GFP_COMP, get_order(size));
	195	}
	196
aa137f9d	197	static __always_inline void *kmalloc(size_t size, gfp_t flags)
81819f0f	198	{
aadb4bc4	199	if (__builtin_constant_p(size)) {
331dc558	200	if (size > PAGE_SIZE)
eada35ef	201	return kmalloc_large(size, flags);
81819f0f	202
aadb4bc4 CL	203	if (!(flags & SLUB_DMA)) {
	204	struct kmem_cache *s = kmalloc_slab(size);
	205
	206	if (!s)
	207	return ZERO_SIZE_PTR;
81819f0f	208
aadb4bc4 CL	209	return kmem_cache_alloc(s, flags);
	210	}
	211	}
	212	return __kmalloc(size, flags);
81819f0f CL	213	}
81819f0f CL	214
81819f0f	215	#ifdef CONFIG_NUMA
6193a2ff PM	216	void *__kmalloc_node(size_t size, gfp_t flags, int node);
6193a2ff PM	217	void kmem_cache_alloc_node(struct kmem_cache , gfp_t flags, int node);
81819f0f	218
aa137f9d	219	static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
81819f0f	220	{
aadb4bc4	221	if (__builtin_constant_p(size) &&
331dc558	222	size <= PAGE_SIZE && !(flags & SLUB_DMA)) {
aadb4bc4	223	struct kmem_cache *s = kmalloc_slab(size);
81819f0f CL	224
81819f0f CL	225	if (!s)
272c1d21	226	return ZERO_SIZE_PTR;
81819f0f CL	227
81819f0f CL	228	return kmem_cache_alloc_node(s, flags, node);
aadb4bc4 CL	229	}
aadb4bc4 CL	230	return __kmalloc_node(size, flags, node);
81819f0f CL	231	}
	232	#endif
	233
	234	#endif /* _LINUX_SLUB_DEF_H */