[linux-2.6-block.git] / mm / percpu-internal.h

#ifndef _MM_PERCPU_INTERNAL_H
#define _MM_PERCPU_INTERNAL_H

#include <linux/types.h>
#include <linux/percpu.h>

struct pcpu_chunk {
#ifdef CONFIG_PERCPU_STATS
	int			nr_alloc;	/* # of allocations */
	size_t			max_alloc_size; /* largest allocation size */
#endif

	struct list_head	list;		/* linked to pcpu_slot lists */
	int			free_size;	/* free bytes in the chunk */
	int			contig_hint;	/* max contiguous size hint */
	void			*base_addr;	/* base address of this chunk */

	int			map_used;	/* # of map entries used before the sentry */
	int			map_alloc;	/* # of map entries allocated */
	int			*map;		/* allocation map */
	struct list_head	map_extend_list;/* on pcpu_map_extend_chunks */

	void			*data;		/* chunk data */
	int			first_free;	/* no free below this */
	bool			immutable;	/* no [de]population allowed */
	int			start_offset;	/* the overlap with the previous
						   region to have a page aligned
						   base_addr */
	int			end_offset;	/* additional area required to
						   have the region end page
						   aligned */
	int			nr_populated;	/* # of populated pages */
	unsigned long		populated[];	/* populated bitmap */
};

extern spinlock_t pcpu_lock;

extern struct list_head *pcpu_slot;
extern int pcpu_nr_slots;
extern int pcpu_nr_empty_pop_pages;

extern struct pcpu_chunk *pcpu_first_chunk;
extern struct pcpu_chunk *pcpu_reserved_chunk;

#ifdef CONFIG_PERCPU_STATS

#include <linux/spinlock.h>

struct percpu_stats {
	u64 nr_alloc;		/* lifetime # of allocations */
	u64 nr_dealloc;		/* lifetime # of deallocations */
	u64 nr_cur_alloc;	/* current # of allocations */
	u64 nr_max_alloc;	/* max # of live allocations */
	u32 nr_chunks;		/* current # of live chunks */
	u32 nr_max_chunks;	/* max # of live chunks */
	size_t min_alloc_size;	/* min allocaiton size */
	size_t max_alloc_size;	/* max allocation size */
};

extern struct percpu_stats pcpu_stats;
extern struct pcpu_alloc_info pcpu_stats_ai;

/*
 * For debug purposes. We don't care about the flexible array.
 */
static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
{
	memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info));

	/* initialize min_alloc_size to unit_size */
	pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size;
}

/*
 * pcpu_stats_area_alloc - increment area allocation stats
 * @chunk: the location of the area being allocated
 * @size: size of area to allocate in bytes
 *
 * CONTEXT:
 * pcpu_lock.
 */
static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
{
	lockdep_assert_held(&pcpu_lock);

	pcpu_stats.nr_alloc++;
	pcpu_stats.nr_cur_alloc++;
	pcpu_stats.nr_max_alloc =
		max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc);
	pcpu_stats.min_alloc_size =
		min(pcpu_stats.min_alloc_size, size);
	pcpu_stats.max_alloc_size =
		max(pcpu_stats.max_alloc_size, size);

	chunk->nr_alloc++;
	chunk->max_alloc_size = max(chunk->max_alloc_size, size);
}

/*
 * pcpu_stats_area_dealloc - decrement allocation stats
 * @chunk: the location of the area being deallocated
 *
 * CONTEXT:
 * pcpu_lock.
 */
static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
{
	lockdep_assert_held(&pcpu_lock);

	pcpu_stats.nr_dealloc++;
	pcpu_stats.nr_cur_alloc--;

	chunk->nr_alloc--;
}

/*
 * pcpu_stats_chunk_alloc - increment chunk stats
 */
static inline void pcpu_stats_chunk_alloc(void)
{
	unsigned long flags;
	spin_lock_irqsave(&pcpu_lock, flags);

	pcpu_stats.nr_chunks++;
	pcpu_stats.nr_max_chunks =
		max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);

	spin_unlock_irqrestore(&pcpu_lock, flags);
}

/*
 * pcpu_stats_chunk_dealloc - decrement chunk stats
 */
static inline void pcpu_stats_chunk_dealloc(void)
{
	unsigned long flags;
	spin_lock_irqsave(&pcpu_lock, flags);

	pcpu_stats.nr_chunks--;

	spin_unlock_irqrestore(&pcpu_lock, flags);
}

#else

static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
{
}

static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
{
}

static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
{
}

static inline void pcpu_stats_chunk_alloc(void)
{
}

static inline void pcpu_stats_chunk_dealloc(void)
{
}

#endif /* !CONFIG_PERCPU_STATS */

#endif
Commit	Line	Data
8fa3ed80 DZ	1	#ifndef _MM_PERCPU_INTERNAL_H
	2	#define _MM_PERCPU_INTERNAL_H
	3
	4	#include <linux/types.h>
	5	#include <linux/percpu.h>
	6
	7	struct pcpu_chunk {
30a5b536 DZ	8	#ifdef CONFIG_PERCPU_STATS
	9	int nr_alloc; /* # of allocations */
	10	size_t max_alloc_size; /* largest allocation size */
	11	#endif
	12
8fa3ed80 DZ	13	struct list_head list; /* linked to pcpu_slot lists */
	14	int free_size; /* free bytes in the chunk */
	15	int contig_hint; /* max contiguous size hint */
	16	void base_addr; / base address of this chunk */
	17
	18	int map_used; /* # of map entries used before the sentry */
	19	int map_alloc; /* # of map entries allocated */
	20	int map; / allocation map */
	21	struct list_head map_extend_list;/* on pcpu_map_extend_chunks */
	22
	23	void data; / chunk data */
	24	int first_free; /* no free below this */
	25	bool immutable; /* no [de]population allowed */
e2266705 DZF	26	int start_offset; /* the overlap with the previous
	27	region to have a page aligned
	28	base_addr */
6b9d7c8e DZF	29	int end_offset; /* additional area required to
	30	have the region end page
	31	aligned */
8fa3ed80 DZ	32	int nr_populated; /* # of populated pages */
	33	unsigned long populated[]; /* populated bitmap */
	34	};
	35
	36	extern spinlock_t pcpu_lock;
	37
	38	extern struct list_head *pcpu_slot;
	39	extern int pcpu_nr_slots;
6b9b6f39	40	extern int pcpu_nr_empty_pop_pages;
8fa3ed80 DZ	41
	42	extern struct pcpu_chunk *pcpu_first_chunk;
	43	extern struct pcpu_chunk *pcpu_reserved_chunk;
	44
30a5b536 DZ	45	#ifdef CONFIG_PERCPU_STATS
	46
	47	#include <linux/spinlock.h>
	48
	49	struct percpu_stats {
	50	u64 nr_alloc; /* lifetime # of allocations */
	51	u64 nr_dealloc; /* lifetime # of deallocations */
	52	u64 nr_cur_alloc; /* current # of allocations */
	53	u64 nr_max_alloc; /* max # of live allocations */
	54	u32 nr_chunks; /* current # of live chunks */
	55	u32 nr_max_chunks; /* max # of live chunks */
	56	size_t min_alloc_size; /* min allocaiton size */
	57	size_t max_alloc_size; /* max allocation size */
	58	};
	59
	60	extern struct percpu_stats pcpu_stats;
	61	extern struct pcpu_alloc_info pcpu_stats_ai;
	62
	63	/*
	64	* For debug purposes. We don't care about the flexible array.
	65	*/
	66	static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
	67	{
	68	memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info));
	69
	70	/* initialize min_alloc_size to unit_size */
	71	pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size;
	72	}
	73
	74	/*
	75	* pcpu_stats_area_alloc - increment area allocation stats
	76	* @chunk: the location of the area being allocated
	77	* @size: size of area to allocate in bytes
	78	*
	79	* CONTEXT:
	80	* pcpu_lock.
	81	*/
	82	static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
	83	{
	84	lockdep_assert_held(&pcpu_lock);
	85
	86	pcpu_stats.nr_alloc++;
	87	pcpu_stats.nr_cur_alloc++;
	88	pcpu_stats.nr_max_alloc =
	89	max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc);
	90	pcpu_stats.min_alloc_size =
	91	min(pcpu_stats.min_alloc_size, size);
	92	pcpu_stats.max_alloc_size =
	93	max(pcpu_stats.max_alloc_size, size);
	94
	95	chunk->nr_alloc++;
	96	chunk->max_alloc_size = max(chunk->max_alloc_size, size);
	97	}
	98
	99	/*
	100	* pcpu_stats_area_dealloc - decrement allocation stats
	101	* @chunk: the location of the area being deallocated
	102	*
	103	* CONTEXT:
	104	* pcpu_lock.
	105	*/
	106	static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
	107	{
	108	lockdep_assert_held(&pcpu_lock);
109
110	pcpu_stats.nr_dealloc++;
111	pcpu_stats.nr_cur_alloc--;
112
113	chunk->nr_alloc--;
114	}
115
116	/*
117	* pcpu_stats_chunk_alloc - increment chunk stats
118	*/
119	static inline void pcpu_stats_chunk_alloc(void)
120	{
303abfdf DZ	121	unsigned long flags;
303abfdf DZ	122	spin_lock_irqsave(&pcpu_lock, flags);
30a5b536 DZ	123
	124	pcpu_stats.nr_chunks++;
	125	pcpu_stats.nr_max_chunks =
	126	max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);
	127
303abfdf	128	spin_unlock_irqrestore(&pcpu_lock, flags);
30a5b536 DZ	129	}
	130
	131	/*
	132	* pcpu_stats_chunk_dealloc - decrement chunk stats
	133	*/
	134	static inline void pcpu_stats_chunk_dealloc(void)
	135	{
303abfdf DZ	136	unsigned long flags;
303abfdf DZ	137	spin_lock_irqsave(&pcpu_lock, flags);
30a5b536 DZ	138
	139	pcpu_stats.nr_chunks--;
	140
303abfdf	141	spin_unlock_irqrestore(&pcpu_lock, flags);
30a5b536 DZ	142	}
	143
	144	#else
	145
	146	static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
	147	{
	148	}
	149
	150	static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
	151	{
	152	}
	153
	154	static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
	155	{
	156	}
	157
	158	static inline void pcpu_stats_chunk_alloc(void)
	159	{
	160	}
	161
	162	static inline void pcpu_stats_chunk_dealloc(void)
	163	{
	164	}
	165
	166	#endif /* !CONFIG_PERCPU_STATS */
	167
8fa3ed80	168	#endif