[net-next-2.6.git] / include / linux / vmstat.h

#ifndef _LINUX_VMSTAT_H
#define _LINUX_VMSTAT_H

#include <linux/types.h>
#include <linux/percpu.h>
#include <linux/config.h>
#include <linux/mmzone.h>
#include <asm/atomic.h>

/*
 * Global page accounting.  One instance per CPU.  Only unsigned longs are
 * allowed.
 *
 * - Fields can be modified with xxx_page_state and xxx_page_state_zone at
 * any time safely (which protects the instance from modification by
 * interrupt.
 * - The __xxx_page_state variants can be used safely when interrupts are
 * disabled.
 * - The __xxx_page_state variants can be used if the field is only
 * modified from process context and protected from preemption, or only
 * modified from interrupt context.  In this case, the field should be
 * commented here.
 */
struct page_state {
	unsigned long pgpgin;		/* Disk reads */
	unsigned long pgpgout;		/* Disk writes */
	unsigned long pswpin;		/* swap reads */
	unsigned long pswpout;		/* swap writes */

	unsigned long pgalloc_high;	/* page allocations */
	unsigned long pgalloc_normal;
	unsigned long pgalloc_dma32;
	unsigned long pgalloc_dma;

	unsigned long pgfree;		/* page freeings */
	unsigned long pgactivate;	/* pages moved inactive->active */
	unsigned long pgdeactivate;	/* pages moved active->inactive */

	unsigned long pgfault;		/* faults (major+minor) */
	unsigned long pgmajfault;	/* faults (major only) */

	unsigned long pgrefill_high;	/* inspected in refill_inactive_zone */
	unsigned long pgrefill_normal;
	unsigned long pgrefill_dma32;
	unsigned long pgrefill_dma;

	unsigned long pgsteal_high;	/* total highmem pages reclaimed */
	unsigned long pgsteal_normal;
	unsigned long pgsteal_dma32;
	unsigned long pgsteal_dma;

	unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
	unsigned long pgscan_kswapd_normal;
	unsigned long pgscan_kswapd_dma32;
	unsigned long pgscan_kswapd_dma;

	unsigned long pgscan_direct_high;/* total highmem pages scanned */
	unsigned long pgscan_direct_normal;
	unsigned long pgscan_direct_dma32;
	unsigned long pgscan_direct_dma;

	unsigned long pginodesteal;	/* pages reclaimed via inode freeing */
	unsigned long slabs_scanned;	/* slab objects scanned */
	unsigned long kswapd_steal;	/* pages reclaimed by kswapd */
	unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
	unsigned long pageoutrun;	/* kswapd's calls to page reclaim */
	unsigned long allocstall;	/* direct reclaim calls */

	unsigned long pgrotated;	/* pages rotated to tail of the LRU */
};

extern void get_full_page_state(struct page_state *ret);
extern void mod_page_state_offset(unsigned long offset, unsigned long delta);
extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);

#define mod_page_state(member, delta)	\
	mod_page_state_offset(offsetof(struct page_state, member), (delta))

#define __mod_page_state(member, delta)	\
	__mod_page_state_offset(offsetof(struct page_state, member), (delta))

#define inc_page_state(member)		mod_page_state(member, 1UL)
#define dec_page_state(member)		mod_page_state(member, 0UL - 1)
#define add_page_state(member,delta)	mod_page_state(member, (delta))
#define sub_page_state(member,delta)	mod_page_state(member, 0UL - (delta))

#define __inc_page_state(member)	__mod_page_state(member, 1UL)
#define __dec_page_state(member)	__mod_page_state(member, 0UL - 1)
#define __add_page_state(member,delta)	__mod_page_state(member, (delta))
#define __sub_page_state(member,delta)	__mod_page_state(member, 0UL - (delta))

#define page_state(member) (*__page_state(offsetof(struct page_state, member)))

#define state_zone_offset(zone, member)					\
({									\
	unsigned offset;						\
	if (is_highmem(zone))						\
		offset = offsetof(struct page_state, member##_high);	\
	else if (is_normal(zone))					\
		offset = offsetof(struct page_state, member##_normal);	\
	else if (is_dma32(zone))					\
		offset = offsetof(struct page_state, member##_dma32);	\
	else								\
		offset = offsetof(struct page_state, member##_dma);	\
	offset;								\
})

#define __mod_page_state_zone(zone, member, delta)			\
 do {									\
	__mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
 } while (0)

#define mod_page_state_zone(zone, member, delta)			\
 do {									\
	mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
 } while (0)

DECLARE_PER_CPU(struct page_state, page_states);

/*
 * Zone based page accounting with per cpu differentials.
 */
extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];

static inline void zone_page_state_add(long x, struct zone *zone,
				 enum zone_stat_item item)
{
	atomic_long_add(x, &zone->vm_stat[item]);
	atomic_long_add(x, &vm_stat[item]);
}

static inline unsigned long global_page_state(enum zone_stat_item item)
{
	long x = atomic_long_read(&vm_stat[item]);
#ifdef CONFIG_SMP
	if (x < 0)
		x = 0;
#endif
	return x;
}

static inline unsigned long zone_page_state(struct zone *zone,
					enum zone_stat_item item)
{
	long x = atomic_long_read(&zone->vm_stat[item]);
#ifdef CONFIG_SMP
	if (x < 0)
		x = 0;
#endif
	return x;
}

#ifdef CONFIG_NUMA
/*
 * Determine the per node value of a stat item. This function
 * is called frequently in a NUMA machine, so try to be as
 * frugal as possible.
 */
static inline unsigned long node_page_state(int node,
				 enum zone_stat_item item)
{
	struct zone *zones = NODE_DATA(node)->node_zones;

	return
#ifndef CONFIG_DMA_IS_NORMAL
#if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
		zone_page_state(&zones[ZONE_DMA32], item) +
#endif
		zone_page_state(&zones[ZONE_NORMAL], item) +
#endif
#ifdef CONFIG_HIGHMEM
		zone_page_state(&zones[ZONE_HIGHMEM], item) +
#endif
		zone_page_state(&zones[ZONE_DMA], item);
}

extern void zone_statistics(struct zonelist *, struct zone *);

#else

#define node_page_state(node, item) global_page_state(item)
#define zone_statistics(_zl,_z) do { } while (0)

#endif /* CONFIG_NUMA */

#define __add_zone_page_state(__z, __i, __d)	\
		__mod_zone_page_state(__z, __i, __d)
#define __sub_zone_page_state(__z, __i, __d)	\
		__mod_zone_page_state(__z, __i,-(__d))

#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))

static inline void zap_zone_vm_stats(struct zone *zone)
{
	memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
}

extern void inc_zone_state(struct zone *, enum zone_stat_item);

#ifdef CONFIG_SMP
void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
void __inc_zone_page_state(struct page *, enum zone_stat_item);
void __dec_zone_page_state(struct page *, enum zone_stat_item);

void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
void inc_zone_page_state(struct page *, enum zone_stat_item);
void dec_zone_page_state(struct page *, enum zone_stat_item);

extern void inc_zone_state(struct zone *, enum zone_stat_item);

void refresh_cpu_vm_stats(int);
void refresh_vm_stats(void);

#else /* CONFIG_SMP */

/*
 * We do not maintain differentials in a single processor configuration.
 * The functions directly modify the zone and global counters.
 */
static inline void __mod_zone_page_state(struct zone *zone,
			enum zone_stat_item item, int delta)
{
	zone_page_state_add(delta, zone, item);
}

static inline void __inc_zone_page_state(struct page *page,
			enum zone_stat_item item)
{
	atomic_long_inc(&page_zone(page)->vm_stat[item]);
	atomic_long_inc(&vm_stat[item]);
}

static inline void __dec_zone_page_state(struct page *page,
			enum zone_stat_item item)
{
	atomic_long_dec(&page_zone(page)->vm_stat[item]);
	atomic_long_dec(&vm_stat[item]);
}

/*
 * We only use atomic operations to update counters. So there is no need to
 * disable interrupts.
 */
#define inc_zone_page_state __inc_zone_page_state
#define dec_zone_page_state __dec_zone_page_state
#define mod_zone_page_state __mod_zone_page_state

static inline void refresh_cpu_vm_stats(int cpu) { }
static inline void refresh_vm_stats(void) { }
#endif

#endif /* _LINUX_VMSTAT_H */
Commit	Line	Data
f6ac2354 CL	1	#ifndef _LINUX_VMSTAT_H
	2	#define _LINUX_VMSTAT_H
	3
	4	#include <linux/types.h>
	5	#include <linux/percpu.h>
2244b95a CL	6	#include <linux/config.h>
	7	#include <linux/mmzone.h>
	8	#include <asm/atomic.h>
f6ac2354 CL	9
	10	/*
	11	* Global page accounting. One instance per CPU. Only unsigned longs are
	12	* allowed.
	13	*
	14	* - Fields can be modified with xxx_page_state and xxx_page_state_zone at
	15	* any time safely (which protects the instance from modification by
	16	* interrupt.
	17	* - The __xxx_page_state variants can be used safely when interrupts are
	18	* disabled.
	19	* - The __xxx_page_state variants can be used if the field is only
	20	* modified from process context and protected from preemption, or only
	21	* modified from interrupt context. In this case, the field should be
	22	* commented here.
	23	*/
	24	struct page_state {
f6ac2354 CL	25	unsigned long pgpgin; /* Disk reads */
	26	unsigned long pgpgout; /* Disk writes */
	27	unsigned long pswpin; /* swap reads */
	28	unsigned long pswpout; /* swap writes */
	29
	30	unsigned long pgalloc_high; /* page allocations */
	31	unsigned long pgalloc_normal;
	32	unsigned long pgalloc_dma32;
	33	unsigned long pgalloc_dma;
	34
	35	unsigned long pgfree; /* page freeings */
	36	unsigned long pgactivate; /* pages moved inactive->active */
	37	unsigned long pgdeactivate; /* pages moved active->inactive */
	38
	39	unsigned long pgfault; /* faults (major+minor) */
	40	unsigned long pgmajfault; /* faults (major only) */
	41
	42	unsigned long pgrefill_high; /* inspected in refill_inactive_zone */
	43	unsigned long pgrefill_normal;
	44	unsigned long pgrefill_dma32;
	45	unsigned long pgrefill_dma;
	46
	47	unsigned long pgsteal_high; /* total highmem pages reclaimed */
	48	unsigned long pgsteal_normal;
	49	unsigned long pgsteal_dma32;
	50	unsigned long pgsteal_dma;
	51
	52	unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
	53	unsigned long pgscan_kswapd_normal;
	54	unsigned long pgscan_kswapd_dma32;
	55	unsigned long pgscan_kswapd_dma;
	56
	57	unsigned long pgscan_direct_high;/* total highmem pages scanned */
	58	unsigned long pgscan_direct_normal;
	59	unsigned long pgscan_direct_dma32;
	60	unsigned long pgscan_direct_dma;
	61
	62	unsigned long pginodesteal; /* pages reclaimed via inode freeing */
	63	unsigned long slabs_scanned; /* slab objects scanned */
	64	unsigned long kswapd_steal; /* pages reclaimed by kswapd */
	65	unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
	66	unsigned long pageoutrun; /* kswapd's calls to page reclaim */
	67	unsigned long allocstall; /* direct reclaim calls */
	68
	69	unsigned long pgrotated; /* pages rotated to tail of the LRU */
f6ac2354 CL	70	};
f6ac2354 CL	71
f6ac2354	72	extern void get_full_page_state(struct page_state *ret);
f6ac2354 CL	73	extern void mod_page_state_offset(unsigned long offset, unsigned long delta);
	74	extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
	75
f6ac2354 CL	76	#define mod_page_state(member, delta) \
	77	mod_page_state_offset(offsetof(struct page_state, member), (delta))
	78
	79	#define __mod_page_state(member, delta) \
	80	__mod_page_state_offset(offsetof(struct page_state, member), (delta))
	81
	82	#define inc_page_state(member) mod_page_state(member, 1UL)
	83	#define dec_page_state(member) mod_page_state(member, 0UL - 1)
	84	#define add_page_state(member,delta) mod_page_state(member, (delta))
	85	#define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))
	86
	87	#define __inc_page_state(member) __mod_page_state(member, 1UL)
	88	#define __dec_page_state(member) __mod_page_state(member, 0UL - 1)
	89	#define __add_page_state(member,delta) __mod_page_state(member, (delta))
	90	#define __sub_page_state(member,delta) __mod_page_state(member, 0UL - (delta))
	91
	92	#define page_state(member) (*__page_state(offsetof(struct page_state, member)))
	93
	94	#define state_zone_offset(zone, member) \
	95	({ \
	96	unsigned offset; \
	97	if (is_highmem(zone)) \
	98	offset = offsetof(struct page_state, member##_high); \
	99	else if (is_normal(zone)) \
	100	offset = offsetof(struct page_state, member##_normal); \
	101	else if (is_dma32(zone)) \
	102	offset = offsetof(struct page_state, member##_dma32); \
	103	else \
	104	offset = offsetof(struct page_state, member##_dma); \
	105	offset; \
	106	})
	107
	108	#define __mod_page_state_zone(zone, member, delta) \
	109	do { \
	110	__mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
	111	} while (0)
	112
	113	#define mod_page_state_zone(zone, member, delta) \
	114	do { \
	115	mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
	116	} while (0)
	117
	118	DECLARE_PER_CPU(struct page_state, page_states);
	119
2244b95a CL	120	/*
	121	* Zone based page accounting with per cpu differentials.
	122	*/
	123	extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
	124
	125	static inline void zone_page_state_add(long x, struct zone *zone,
	126	enum zone_stat_item item)
	127	{
	128	atomic_long_add(x, &zone->vm_stat[item]);
	129	atomic_long_add(x, &vm_stat[item]);
	130	}
	131
	132	static inline unsigned long global_page_state(enum zone_stat_item item)
	133	{
	134	long x = atomic_long_read(&vm_stat[item]);
	135	#ifdef CONFIG_SMP
	136	if (x < 0)
	137	x = 0;
	138	#endif
	139	return x;
	140	}
	141
	142	static inline unsigned long zone_page_state(struct zone *zone,
	143	enum zone_stat_item item)
	144	{
	145	long x = atomic_long_read(&zone->vm_stat[item]);
	146	#ifdef CONFIG_SMP
	147	if (x < 0)
	148	x = 0;
	149	#endif
	150	return x;
	151	}
	152
	153	#ifdef CONFIG_NUMA
	154	/*
	155	* Determine the per node value of a stat item. This function
	156	* is called frequently in a NUMA machine, so try to be as
	157	* frugal as possible.
	158	*/
	159	static inline unsigned long node_page_state(int node,
	160	enum zone_stat_item item)
	161	{
	162	struct zone *zones = NODE_DATA(node)->node_zones;
	163
	164	return
	165	#ifndef CONFIG_DMA_IS_NORMAL
	166	#if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
	167	zone_page_state(&zones[ZONE_DMA32], item) +
	168	#endif
	169	zone_page_state(&zones[ZONE_NORMAL], item) +
	170	#endif
	171	#ifdef CONFIG_HIGHMEM
	172	zone_page_state(&zones[ZONE_HIGHMEM], item) +
	173	#endif
	174	zone_page_state(&zones[ZONE_DMA], item);
	175	}
ca889e6c CL	176
	177	extern void zone_statistics(struct zonelist , struct zone );
	178
2244b95a	179	#else
ca889e6c	180
2244b95a	181	#define node_page_state(node, item) global_page_state(item)
ca889e6c CL	182	#define zone_statistics(_zl,_z) do { } while (0)
	183
	184	#endif /* CONFIG_NUMA */
2244b95a CL	185
	186	#define __add_zone_page_state(__z, __i, __d) \
	187	__mod_zone_page_state(__z, __i, __d)
	188	#define __sub_zone_page_state(__z, __i, __d) \
	189	__mod_zone_page_state(__z, __i,-(__d))
	190
	191	#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
	192	#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
	193
	194	static inline void zap_zone_vm_stats(struct zone *zone)
	195	{
	196	memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
	197	}
	198
ca889e6c CL	199	extern void inc_zone_state(struct zone *, enum zone_stat_item);
ca889e6c CL	200
2244b95a CL	201	#ifdef CONFIG_SMP
	202	void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
	203	void __inc_zone_page_state(struct page *, enum zone_stat_item);
	204	void __dec_zone_page_state(struct page *, enum zone_stat_item);
f6ac2354	205
2244b95a CL	206	void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
	207	void inc_zone_page_state(struct page *, enum zone_stat_item);
	208	void dec_zone_page_state(struct page *, enum zone_stat_item);
	209
	210	extern void inc_zone_state(struct zone *, enum zone_stat_item);
	211
	212	void refresh_cpu_vm_stats(int);
	213	void refresh_vm_stats(void);
	214
	215	#else /* CONFIG_SMP */
	216
	217	/*
	218	* We do not maintain differentials in a single processor configuration.
	219	* The functions directly modify the zone and global counters.
	220	*/
	221	static inline void __mod_zone_page_state(struct zone *zone,
	222	enum zone_stat_item item, int delta)
	223	{
	224	zone_page_state_add(delta, zone, item);
	225	}
	226
	227	static inline void __inc_zone_page_state(struct page *page,
	228	enum zone_stat_item item)
	229	{
	230	atomic_long_inc(&page_zone(page)->vm_stat[item]);
	231	atomic_long_inc(&vm_stat[item]);
	232	}
	233
	234	static inline void __dec_zone_page_state(struct page *page,
	235	enum zone_stat_item item)
	236	{
	237	atomic_long_dec(&page_zone(page)->vm_stat[item]);
	238	atomic_long_dec(&vm_stat[item]);
	239	}
	240
	241	/*
	242	* We only use atomic operations to update counters. So there is no need to
	243	* disable interrupts.
	244	*/
	245	#define inc_zone_page_state __inc_zone_page_state
	246	#define dec_zone_page_state __dec_zone_page_state
	247	#define mod_zone_page_state __mod_zone_page_state
	248
	249	static inline void refresh_cpu_vm_stats(int cpu) { }
	250	static inline void refresh_vm_stats(void) { }
	251	#endif
	252
	253	#endif /* _LINUX_VMSTAT_H */