[deliverable/linux.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 nr_writeback;	/* Pages under writeback */
	unsigned long nr_unstable;	/* NFS unstable pages */
#define GET_PAGE_STATE_LAST nr_unstable

	/*
	 * The below are zeroed by get_page_state().  Use get_full_page_state()
	 * to add up all these.
	 */
	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 */
	unsigned long nr_bounce;	/* pages for bounce buffers */
};

extern void get_page_state(struct page_state *ret);
extern void get_page_state_node(struct page_state *ret, int node);
extern void get_full_page_state(struct page_state *ret);
extern unsigned long read_page_state_offset(unsigned long offset);
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 read_page_state(member) \
	read_page_state_offset(offsetof(struct page_state, member))

#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);
}
#else
#define node_page_state(node, item) global_page_state(item)
#endif

#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));
}

#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 nr_writeback; /* Pages under writeback */
f6ac2354 CL	26	unsigned long nr_unstable; /* NFS unstable pages */
df849a15	27	#define GET_PAGE_STATE_LAST nr_unstable
f6ac2354 CL	28
	29	/*
	30	* The below are zeroed by get_page_state(). Use get_full_page_state()
	31	* to add up all these.
	32	*/
	33	unsigned long pgpgin; /* Disk reads */
	34	unsigned long pgpgout; /* Disk writes */
	35	unsigned long pswpin; /* swap reads */
	36	unsigned long pswpout; /* swap writes */
	37
	38	unsigned long pgalloc_high; /* page allocations */
	39	unsigned long pgalloc_normal;
	40	unsigned long pgalloc_dma32;
	41	unsigned long pgalloc_dma;
	42
	43	unsigned long pgfree; /* page freeings */
	44	unsigned long pgactivate; /* pages moved inactive->active */
	45	unsigned long pgdeactivate; /* pages moved active->inactive */
	46
	47	unsigned long pgfault; /* faults (major+minor) */
	48	unsigned long pgmajfault; /* faults (major only) */
	49
	50	unsigned long pgrefill_high; /* inspected in refill_inactive_zone */
	51	unsigned long pgrefill_normal;
	52	unsigned long pgrefill_dma32;
	53	unsigned long pgrefill_dma;
	54
	55	unsigned long pgsteal_high; /* total highmem pages reclaimed */
	56	unsigned long pgsteal_normal;
	57	unsigned long pgsteal_dma32;
	58	unsigned long pgsteal_dma;
	59
	60	unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
	61	unsigned long pgscan_kswapd_normal;
	62	unsigned long pgscan_kswapd_dma32;
	63	unsigned long pgscan_kswapd_dma;
	64
	65	unsigned long pgscan_direct_high;/* total highmem pages scanned */
	66	unsigned long pgscan_direct_normal;
	67	unsigned long pgscan_direct_dma32;
	68	unsigned long pgscan_direct_dma;
	69
	70	unsigned long pginodesteal; /* pages reclaimed via inode freeing */
	71	unsigned long slabs_scanned; /* slab objects scanned */
	72	unsigned long kswapd_steal; /* pages reclaimed by kswapd */
	73	unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
	74	unsigned long pageoutrun; /* kswapd's calls to page reclaim */
	75	unsigned long allocstall; /* direct reclaim calls */
	76
	77	unsigned long pgrotated; /* pages rotated to tail of the LRU */
	78	unsigned long nr_bounce; /* pages for bounce buffers */
	79	};
	80
	81	extern void get_page_state(struct page_state *ret);
	82	extern void get_page_state_node(struct page_state *ret, int node);
	83	extern void get_full_page_state(struct page_state *ret);
	84	extern unsigned long read_page_state_offset(unsigned long offset);
	85	extern void mod_page_state_offset(unsigned long offset, unsigned long delta);
	86	extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
	87
	88	#define read_page_state(member) \
	89	read_page_state_offset(offsetof(struct page_state, member))
	90
	91	#define mod_page_state(member, delta) \
92	mod_page_state_offset(offsetof(struct page_state, member), (delta))
93
94	#define __mod_page_state(member, delta) \
95	__mod_page_state_offset(offsetof(struct page_state, member), (delta))
96
97	#define inc_page_state(member) mod_page_state(member, 1UL)
98	#define dec_page_state(member) mod_page_state(member, 0UL - 1)
99	#define add_page_state(member,delta) mod_page_state(member, (delta))
100	#define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))
101
102	#define __inc_page_state(member) __mod_page_state(member, 1UL)
103	#define __dec_page_state(member) __mod_page_state(member, 0UL - 1)
104	#define __add_page_state(member,delta) __mod_page_state(member, (delta))
105	#define __sub_page_state(member,delta) __mod_page_state(member, 0UL - (delta))
106
107	#define page_state(member) (*__page_state(offsetof(struct page_state, member)))
108
109	#define state_zone_offset(zone, member) \
110	({ \
111	unsigned offset; \
112	if (is_highmem(zone)) \
113	offset = offsetof(struct page_state, member##_high); \
114	else if (is_normal(zone)) \
115	offset = offsetof(struct page_state, member##_normal); \
116	else if (is_dma32(zone)) \
117	offset = offsetof(struct page_state, member##_dma32); \
118	else \
119	offset = offsetof(struct page_state, member##_dma); \
120	offset; \
121	})
122
123	#define __mod_page_state_zone(zone, member, delta) \
124	do { \
125	__mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
126	} while (0)
127
128	#define mod_page_state_zone(zone, member, delta) \
129	do { \
130	mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
131	} while (0)
132
133	DECLARE_PER_CPU(struct page_state, page_states);
134
2244b95a CL	135	/*
	136	* Zone based page accounting with per cpu differentials.
	137	*/
	138	extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
	139
	140	static inline void zone_page_state_add(long x, struct zone *zone,
	141	enum zone_stat_item item)
	142	{
	143	atomic_long_add(x, &zone->vm_stat[item]);
	144	atomic_long_add(x, &vm_stat[item]);
	145	}
	146
	147	static inline unsigned long global_page_state(enum zone_stat_item item)
	148	{
	149	long x = atomic_long_read(&vm_stat[item]);
	150	#ifdef CONFIG_SMP
	151	if (x < 0)
	152	x = 0;
	153	#endif
	154	return x;
	155	}
	156
	157	static inline unsigned long zone_page_state(struct zone *zone,
	158	enum zone_stat_item item)
	159	{
	160	long x = atomic_long_read(&zone->vm_stat[item]);
	161	#ifdef CONFIG_SMP
	162	if (x < 0)
	163	x = 0;
	164	#endif
	165	return x;
	166	}
	167
	168	#ifdef CONFIG_NUMA
	169	/*
	170	* Determine the per node value of a stat item. This function
	171	* is called frequently in a NUMA machine, so try to be as
	172	* frugal as possible.
	173	*/
	174	static inline unsigned long node_page_state(int node,
	175	enum zone_stat_item item)
	176	{
	177	struct zone *zones = NODE_DATA(node)->node_zones;
	178
	179	return
	180	#ifndef CONFIG_DMA_IS_NORMAL
	181	#if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
	182	zone_page_state(&zones[ZONE_DMA32], item) +
	183	#endif
	184	zone_page_state(&zones[ZONE_NORMAL], item) +
	185	#endif
	186	#ifdef CONFIG_HIGHMEM
	187	zone_page_state(&zones[ZONE_HIGHMEM], item) +
	188	#endif
	189	zone_page_state(&zones[ZONE_DMA], item);
	190	}
	191	#else
	192	#define node_page_state(node, item) global_page_state(item)
	193	#endif
	194
	195	#define __add_zone_page_state(__z, __i, __d) \
	196	__mod_zone_page_state(__z, __i, __d)
	197	#define __sub_zone_page_state(__z, __i, __d) \
	198	__mod_zone_page_state(__z, __i,-(__d))
199
200	#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
201	#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
202
203	static inline void zap_zone_vm_stats(struct zone *zone)
204	{
205	memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
206	}
207
208	#ifdef CONFIG_SMP
209	void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
210	void __inc_zone_page_state(struct page *, enum zone_stat_item);
211	void __dec_zone_page_state(struct page *, enum zone_stat_item);
f6ac2354	212
2244b95a CL	213	void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
	214	void inc_zone_page_state(struct page *, enum zone_stat_item);
	215	void dec_zone_page_state(struct page *, enum zone_stat_item);
	216
	217	extern void inc_zone_state(struct zone *, enum zone_stat_item);
	218
	219	void refresh_cpu_vm_stats(int);
	220	void refresh_vm_stats(void);
	221
	222	#else /* CONFIG_SMP */
	223
	224	/*
	225	* We do not maintain differentials in a single processor configuration.
	226	* The functions directly modify the zone and global counters.
	227	*/
	228	static inline void __mod_zone_page_state(struct zone *zone,
	229	enum zone_stat_item item, int delta)
	230	{
	231	zone_page_state_add(delta, zone, item);
	232	}
	233
	234	static inline void __inc_zone_page_state(struct page *page,
	235	enum zone_stat_item item)
	236	{
	237	atomic_long_inc(&page_zone(page)->vm_stat[item]);
	238	atomic_long_inc(&vm_stat[item]);
	239	}
	240
	241	static inline void __dec_zone_page_state(struct page *page,
	242	enum zone_stat_item item)
	243	{
	244	atomic_long_dec(&page_zone(page)->vm_stat[item]);
	245	atomic_long_dec(&vm_stat[item]);
	246	}
	247
	248	/*
	249	* We only use atomic operations to update counters. So there is no need to
	250	* disable interrupts.
	251	*/
	252	#define inc_zone_page_state __inc_zone_page_state
	253	#define dec_zone_page_state __dec_zone_page_state
	254	#define mod_zone_page_state __mod_zone_page_state
	255
	256	static inline void refresh_cpu_vm_stats(int cpu) { }
	257	static inline void refresh_vm_stats(void) { }
	258	#endif
	259
	260	#endif /* _LINUX_VMSTAT_H */