[mirror_ubuntu-zesty-kernel.git] / mm / vmstat.c

/*
 *  linux/mm/vmstat.c
 *
 *  Manages VM statistics
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  zoned VM statistics
 *  Copyright (C) 2006 Silicon Graphics, Inc.,
 *		Christoph Lameter <christoph@lameter.com>
 */

#include <linux/config.h>
#include <linux/mm.h>
#include <linux/module.h>

/*
 * Accumulate the page_state information across all CPUs.
 * The result is unavoidably approximate - it can change
 * during and after execution of this function.
 */
DEFINE_PER_CPU(struct page_state, page_states) = {0};

static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
{
	unsigned cpu;

	memset(ret, 0, nr * sizeof(unsigned long));
	cpus_and(*cpumask, *cpumask, cpu_online_map);

	for_each_cpu_mask(cpu, *cpumask) {
		unsigned long *in;
		unsigned long *out;
		unsigned off;
		unsigned next_cpu;

		in = (unsigned long *)&per_cpu(page_states, cpu);

		next_cpu = next_cpu(cpu, *cpumask);
		if (likely(next_cpu < NR_CPUS))
			prefetch(&per_cpu(page_states, next_cpu));

		out = (unsigned long *)ret;
		for (off = 0; off < nr; off++)
			*out++ += *in++;
	}
}

void get_full_page_state(struct page_state *ret)
{
	cpumask_t mask = CPU_MASK_ALL;

	__get_page_state(ret, sizeof(*ret) / sizeof(unsigned long), &mask);
}

void __mod_page_state_offset(unsigned long offset, unsigned long delta)
{
	void *ptr;

	ptr = &__get_cpu_var(page_states);
	*(unsigned long *)(ptr + offset) += delta;
}
EXPORT_SYMBOL(__mod_page_state_offset);

void mod_page_state_offset(unsigned long offset, unsigned long delta)
{
	unsigned long flags;
	void *ptr;

	local_irq_save(flags);
	ptr = &__get_cpu_var(page_states);
	*(unsigned long *)(ptr + offset) += delta;
	local_irq_restore(flags);
}
EXPORT_SYMBOL(mod_page_state_offset);

void __get_zone_counts(unsigned long *active, unsigned long *inactive,
			unsigned long *free, struct pglist_data *pgdat)
{
	struct zone *zones = pgdat->node_zones;
	int i;

	*active = 0;
	*inactive = 0;
	*free = 0;
	for (i = 0; i < MAX_NR_ZONES; i++) {
		*active += zones[i].nr_active;
		*inactive += zones[i].nr_inactive;
		*free += zones[i].free_pages;
	}
}

void get_zone_counts(unsigned long *active,
		unsigned long *inactive, unsigned long *free)
{
	struct pglist_data *pgdat;

	*active = 0;
	*inactive = 0;
	*free = 0;
	for_each_online_pgdat(pgdat) {
		unsigned long l, m, n;
		__get_zone_counts(&l, &m, &n, pgdat);
		*active += l;
		*inactive += m;
		*free += n;
	}
}

/*
 * Manage combined zone based / global counters
 *
 * vm_stat contains the global counters
 */
atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
EXPORT_SYMBOL(vm_stat);

#ifdef CONFIG_SMP

#define STAT_THRESHOLD 32

/*
 * Determine pointer to currently valid differential byte given a zone and
 * the item number.
 *
 * Preemption must be off
 */
static inline s8 *diff_pointer(struct zone *zone, enum zone_stat_item item)
{
	return &zone_pcp(zone, smp_processor_id())->vm_stat_diff[item];
}

/*
 * For use when we know that interrupts are disabled.
 */
void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
				int delta)
{
	s8 *p;
	long x;

	p = diff_pointer(zone, item);
	x = delta + *p;

	if (unlikely(x > STAT_THRESHOLD || x < -STAT_THRESHOLD)) {
		zone_page_state_add(x, zone, item);
		x = 0;
	}

	*p = x;
}
EXPORT_SYMBOL(__mod_zone_page_state);

/*
 * For an unknown interrupt state
 */
void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
					int delta)
{
	unsigned long flags;

	local_irq_save(flags);
	__mod_zone_page_state(zone, item, delta);
	local_irq_restore(flags);
}
EXPORT_SYMBOL(mod_zone_page_state);

/*
 * Optimized increment and decrement functions.
 *
 * These are only for a single page and therefore can take a struct page *
 * argument instead of struct zone *. This allows the inclusion of the code
 * generated for page_zone(page) into the optimized functions.
 *
 * No overflow check is necessary and therefore the differential can be
 * incremented or decremented in place which may allow the compilers to
 * generate better code.
 *
 * The increment or decrement is known and therefore one boundary check can
 * be omitted.
 *
 * Some processors have inc/dec instructions that are atomic vs an interrupt.
 * However, the code must first determine the differential location in a zone
 * based on the processor number and then inc/dec the counter. There is no
 * guarantee without disabling preemption that the processor will not change
 * in between and therefore the atomicity vs. interrupt cannot be exploited
 * in a useful way here.
 */
void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
{
	struct zone *zone = page_zone(page);
	s8 *p = diff_pointer(zone, item);

	(*p)++;

	if (unlikely(*p > STAT_THRESHOLD)) {
		zone_page_state_add(*p, zone, item);
		*p = 0;
	}
}
EXPORT_SYMBOL(__inc_zone_page_state);

void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
{
	struct zone *zone = page_zone(page);
	s8 *p = diff_pointer(zone, item);

	(*p)--;

	if (unlikely(*p < -STAT_THRESHOLD)) {
		zone_page_state_add(*p, zone, item);
		*p = 0;
	}
}
EXPORT_SYMBOL(__dec_zone_page_state);

void inc_zone_page_state(struct page *page, enum zone_stat_item item)
{
	unsigned long flags;
	struct zone *zone;
	s8 *p;

	zone = page_zone(page);
	local_irq_save(flags);
	p = diff_pointer(zone, item);

	(*p)++;

	if (unlikely(*p > STAT_THRESHOLD)) {
		zone_page_state_add(*p, zone, item);
		*p = 0;
	}
	local_irq_restore(flags);
}
EXPORT_SYMBOL(inc_zone_page_state);

void dec_zone_page_state(struct page *page, enum zone_stat_item item)
{
	unsigned long flags;
	struct zone *zone;
	s8 *p;

	zone = page_zone(page);
	local_irq_save(flags);
	p = diff_pointer(zone, item);

	(*p)--;

	if (unlikely(*p < -STAT_THRESHOLD)) {
		zone_page_state_add(*p, zone, item);
		*p = 0;
	}
	local_irq_restore(flags);
}
EXPORT_SYMBOL(dec_zone_page_state);

/*
 * Update the zone counters for one cpu.
 */
void refresh_cpu_vm_stats(int cpu)
{
	struct zone *zone;
	int i;
	unsigned long flags;

	for_each_zone(zone) {
		struct per_cpu_pageset *pcp;

		pcp = zone_pcp(zone, cpu);

		for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
			if (pcp->vm_stat_diff[i]) {
				local_irq_save(flags);
				zone_page_state_add(pcp->vm_stat_diff[i],
					zone, i);
				pcp->vm_stat_diff[i] = 0;
				local_irq_restore(flags);
			}
	}
}

static void __refresh_cpu_vm_stats(void *dummy)
{
	refresh_cpu_vm_stats(smp_processor_id());
}

/*
 * Consolidate all counters.
 *
 * Note that the result is less inaccurate but still inaccurate
 * if concurrent processes are allowed to run.
 */
void refresh_vm_stats(void)
{
	on_each_cpu(__refresh_cpu_vm_stats, NULL, 0, 1);
}
EXPORT_SYMBOL(refresh_vm_stats);

#endif

#ifdef CONFIG_PROC_FS

#include <linux/seq_file.h>

static void *frag_start(struct seq_file *m, loff_t *pos)
{
	pg_data_t *pgdat;
	loff_t node = *pos;
	for (pgdat = first_online_pgdat();
	     pgdat && node;
	     pgdat = next_online_pgdat(pgdat))
		--node;

	return pgdat;
}

static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
{
	pg_data_t *pgdat = (pg_data_t *)arg;

	(*pos)++;
	return next_online_pgdat(pgdat);
}

static void frag_stop(struct seq_file *m, void *arg)
{
}

/*
 * This walks the free areas for each zone.
 */
static int frag_show(struct seq_file *m, void *arg)
{
	pg_data_t *pgdat = (pg_data_t *)arg;
	struct zone *zone;
	struct zone *node_zones = pgdat->node_zones;
	unsigned long flags;
	int order;

	for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
		if (!populated_zone(zone))
			continue;

		spin_lock_irqsave(&zone->lock, flags);
		seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
		for (order = 0; order < MAX_ORDER; ++order)
			seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
		spin_unlock_irqrestore(&zone->lock, flags);
		seq_putc(m, '\n');
	}
	return 0;
}

struct seq_operations fragmentation_op = {
	.start	= frag_start,
	.next	= frag_next,
	.stop	= frag_stop,
	.show	= frag_show,
};

static char *vmstat_text[] = {
	/* Zoned VM counters */
	"nr_anon_pages",
	"nr_mapped",
	"nr_file_pages",
	"nr_slab",
	"nr_page_table_pages",
	"nr_dirty",
	"nr_writeback",
	"nr_unstable",
	"nr_bounce",

	/* Event counters */
	"pgpgin",
	"pgpgout",
	"pswpin",
	"pswpout",

	"pgalloc_high",
	"pgalloc_normal",
	"pgalloc_dma32",
	"pgalloc_dma",

	"pgfree",
	"pgactivate",
	"pgdeactivate",

	"pgfault",
	"pgmajfault",

	"pgrefill_high",
	"pgrefill_normal",
	"pgrefill_dma32",
	"pgrefill_dma",

	"pgsteal_high",
	"pgsteal_normal",
	"pgsteal_dma32",
	"pgsteal_dma",

	"pgscan_kswapd_high",
	"pgscan_kswapd_normal",
	"pgscan_kswapd_dma32",
	"pgscan_kswapd_dma",

	"pgscan_direct_high",
	"pgscan_direct_normal",
	"pgscan_direct_dma32",
	"pgscan_direct_dma",

	"pginodesteal",
	"slabs_scanned",
	"kswapd_steal",
	"kswapd_inodesteal",
	"pageoutrun",
	"allocstall",

	"pgrotated",
};

/*
 * Output information about zones in @pgdat.
 */
static int zoneinfo_show(struct seq_file *m, void *arg)
{
	pg_data_t *pgdat = arg;
	struct zone *zone;
	struct zone *node_zones = pgdat->node_zones;
	unsigned long flags;

	for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
		int i;

		if (!populated_zone(zone))
			continue;

		spin_lock_irqsave(&zone->lock, flags);
		seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
		seq_printf(m,
			   "\n  pages free     %lu"
			   "\n        min      %lu"
			   "\n        low      %lu"
			   "\n        high     %lu"
			   "\n        active   %lu"
			   "\n        inactive %lu"
			   "\n        scanned  %lu (a: %lu i: %lu)"
			   "\n        spanned  %lu"
			   "\n        present  %lu",
			   zone->free_pages,
			   zone->pages_min,
			   zone->pages_low,
			   zone->pages_high,
			   zone->nr_active,
			   zone->nr_inactive,
			   zone->pages_scanned,
			   zone->nr_scan_active, zone->nr_scan_inactive,
			   zone->spanned_pages,
			   zone->present_pages);

		for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
			seq_printf(m, "\n    %-12s %lu", vmstat_text[i],
					zone_page_state(zone, i));

		seq_printf(m,
			   "\n        protection: (%lu",
			   zone->lowmem_reserve[0]);
		for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
			seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
		seq_printf(m,
			   ")"
			   "\n  pagesets");
		for_each_online_cpu(i) {
			struct per_cpu_pageset *pageset;
			int j;

			pageset = zone_pcp(zone, i);
			for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
				if (pageset->pcp[j].count)
					break;
			}
			if (j == ARRAY_SIZE(pageset->pcp))
				continue;
			for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
				seq_printf(m,
					   "\n    cpu: %i pcp: %i"
					   "\n              count: %i"
					   "\n              high:  %i"
					   "\n              batch: %i",
					   i, j,
					   pageset->pcp[j].count,
					   pageset->pcp[j].high,
					   pageset->pcp[j].batch);
			}
#ifdef CONFIG_NUMA
			seq_printf(m,
				   "\n            numa_hit:       %lu"
				   "\n            numa_miss:      %lu"
				   "\n            numa_foreign:   %lu"
				   "\n            interleave_hit: %lu"
				   "\n            local_node:     %lu"
				   "\n            other_node:     %lu",
				   pageset->numa_hit,
				   pageset->numa_miss,
				   pageset->numa_foreign,
				   pageset->interleave_hit,
				   pageset->local_node,
				   pageset->other_node);
#endif
		}
		seq_printf(m,
			   "\n  all_unreclaimable: %u"
			   "\n  prev_priority:     %i"
			   "\n  temp_priority:     %i"
			   "\n  start_pfn:         %lu",
			   zone->all_unreclaimable,
			   zone->prev_priority,
			   zone->temp_priority,
			   zone->zone_start_pfn);
		spin_unlock_irqrestore(&zone->lock, flags);
		seq_putc(m, '\n');
	}
	return 0;
}

struct seq_operations zoneinfo_op = {
	.start	= frag_start, /* iterate over all zones. The same as in
			       * fragmentation. */
	.next	= frag_next,
	.stop	= frag_stop,
	.show	= zoneinfo_show,
};

static void *vmstat_start(struct seq_file *m, loff_t *pos)
{
	unsigned long *v;
	struct page_state *ps;
	int i;

	if (*pos >= ARRAY_SIZE(vmstat_text))
		return NULL;

	v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long)
			+ sizeof(*ps), GFP_KERNEL);
	m->private = v;
	if (!v)
		return ERR_PTR(-ENOMEM);
	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
		v[i] = global_page_state(i);
	ps = (struct page_state *)(v + NR_VM_ZONE_STAT_ITEMS);
	get_full_page_state(ps);
	ps->pgpgin /= 2;		/* sectors -> kbytes */
	ps->pgpgout /= 2;
	return v + *pos;
}

static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)
{
	(*pos)++;
	if (*pos >= ARRAY_SIZE(vmstat_text))
		return NULL;
	return (unsigned long *)m->private + *pos;
}

static int vmstat_show(struct seq_file *m, void *arg)
{
	unsigned long *l = arg;
	unsigned long off = l - (unsigned long *)m->private;

	seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
	return 0;
}

static void vmstat_stop(struct seq_file *m, void *arg)
{
	kfree(m->private);
	m->private = NULL;
}

struct seq_operations vmstat_op = {
	.start	= vmstat_start,
	.next	= vmstat_next,
	.stop	= vmstat_stop,
	.show	= vmstat_show,
};

#endif /* CONFIG_PROC_FS */
Commit	Line	Data
f6ac2354 CL	1	/*
	2	* linux/mm/vmstat.c
	3	*
	4	* Manages VM statistics
	5	* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
2244b95a CL	6	*
	7	* zoned VM statistics
	8	* Copyright (C) 2006 Silicon Graphics, Inc.,
	9	* Christoph Lameter <christoph@lameter.com>
f6ac2354 CL	10	*/
	11
	12	#include <linux/config.h>
	13	#include <linux/mm.h>
2244b95a	14	#include <linux/module.h>
f6ac2354 CL	15
	16	/*
	17	* Accumulate the page_state information across all CPUs.
	18	* The result is unavoidably approximate - it can change
	19	* during and after execution of this function.
	20	*/
	21	DEFINE_PER_CPU(struct page_state, page_states) = {0};
	22
f6ac2354 CL	23	static void __get_page_state(struct page_state ret, int nr, cpumask_t cpumask)
	24	{
	25	unsigned cpu;
	26
	27	memset(ret, 0, nr * sizeof(unsigned long));
	28	cpus_and(cpumask, cpumask, cpu_online_map);
	29
	30	for_each_cpu_mask(cpu, *cpumask) {
	31	unsigned long *in;
	32	unsigned long *out;
	33	unsigned off;
	34	unsigned next_cpu;
	35
	36	in = (unsigned long *)&per_cpu(page_states, cpu);
	37
	38	next_cpu = next_cpu(cpu, *cpumask);
	39	if (likely(next_cpu < NR_CPUS))
	40	prefetch(&per_cpu(page_states, next_cpu));
	41
	42	out = (unsigned long *)ret;
	43	for (off = 0; off < nr; off++)
	44	out++ += in++;
	45	}
	46	}
	47
f6ac2354 CL	48	void get_full_page_state(struct page_state *ret)
	49	{
	50	cpumask_t mask = CPU_MASK_ALL;
	51
	52	__get_page_state(ret, sizeof(*ret) / sizeof(unsigned long), &mask);
	53	}
	54
f6ac2354 CL	55	void __mod_page_state_offset(unsigned long offset, unsigned long delta)
	56	{
	57	void *ptr;
	58
	59	ptr = &__get_cpu_var(page_states);
	60	(unsigned long )(ptr + offset) += delta;
	61	}
	62	EXPORT_SYMBOL(__mod_page_state_offset);
	63
	64	void mod_page_state_offset(unsigned long offset, unsigned long delta)
	65	{
	66	unsigned long flags;
	67	void *ptr;
	68
	69	local_irq_save(flags);
	70	ptr = &__get_cpu_var(page_states);
	71	(unsigned long )(ptr + offset) += delta;
	72	local_irq_restore(flags);
	73	}
	74	EXPORT_SYMBOL(mod_page_state_offset);
	75
	76	void __get_zone_counts(unsigned long active, unsigned long inactive,
	77	unsigned long free, struct pglist_data pgdat)
	78	{
	79	struct zone *zones = pgdat->node_zones;
	80	int i;
	81
	82	*active = 0;
	83	*inactive = 0;
	84	*free = 0;
	85	for (i = 0; i < MAX_NR_ZONES; i++) {
	86	*active += zones[i].nr_active;
	87	*inactive += zones[i].nr_inactive;
	88	*free += zones[i].free_pages;
	89	}
	90	}
	91
	92	void get_zone_counts(unsigned long *active,
	93	unsigned long inactive, unsigned long free)
	94	{
	95	struct pglist_data *pgdat;
	96
	97	*active = 0;
	98	*inactive = 0;
	99	*free = 0;
	100	for_each_online_pgdat(pgdat) {
	101	unsigned long l, m, n;
	102	__get_zone_counts(&l, &m, &n, pgdat);
	103	*active += l;
	104	*inactive += m;
	105	*free += n;
	106	}
	107	}
	108
2244b95a CL	109	/*
	110	* Manage combined zone based / global counters
	111	*
	112	* vm_stat contains the global counters
	113	*/
	114	atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
	115	EXPORT_SYMBOL(vm_stat);
	116
	117	#ifdef CONFIG_SMP
	118
	119	#define STAT_THRESHOLD 32
	120
	121	/*
	122	* Determine pointer to currently valid differential byte given a zone and
	123	* the item number.
	124	*
	125	* Preemption must be off
	126	*/
	127	static inline s8 diff_pointer(struct zone zone, enum zone_stat_item item)
	128	{
	129	return &zone_pcp(zone, smp_processor_id())->vm_stat_diff[item];
	130	}
	131
	132	/*
	133	* For use when we know that interrupts are disabled.
	134	*/
	135	void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
	136	int delta)
	137	{
	138	s8 *p;
	139	long x;
	140
	141	p = diff_pointer(zone, item);
	142	x = delta + *p;
	143
	144	if (unlikely(x > STAT_THRESHOLD \|\| x < -STAT_THRESHOLD)) {
	145	zone_page_state_add(x, zone, item);
	146	x = 0;
	147	}
	148
	149	*p = x;
	150	}
	151	EXPORT_SYMBOL(__mod_zone_page_state);
	152
	153	/*
	154	* For an unknown interrupt state
	155	*/
	156	void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
	157	int delta)
	158	{
	159	unsigned long flags;
	160
	161	local_irq_save(flags);
	162	__mod_zone_page_state(zone, item, delta);
	163	local_irq_restore(flags);
	164	}
	165	EXPORT_SYMBOL(mod_zone_page_state);
	166
	167	/*
	168	* Optimized increment and decrement functions.
	169	*
	170	* These are only for a single page and therefore can take a struct page *
	171	* argument instead of struct zone *. This allows the inclusion of the code
	172	* generated for page_zone(page) into the optimized functions.
173	*
174	* No overflow check is necessary and therefore the differential can be
175	* incremented or decremented in place which may allow the compilers to
176	* generate better code.
177	*
178	* The increment or decrement is known and therefore one boundary check can
179	* be omitted.
180	*
181	* Some processors have inc/dec instructions that are atomic vs an interrupt.
182	* However, the code must first determine the differential location in a zone
183	* based on the processor number and then inc/dec the counter. There is no
184	* guarantee without disabling preemption that the processor will not change
185	* in between and therefore the atomicity vs. interrupt cannot be exploited
186	* in a useful way here.
187	*/
188	void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
189	{
190	struct zone *zone = page_zone(page);
191	s8 *p = diff_pointer(zone, item);
192
193	(*p)++;
194
195	if (unlikely(*p > STAT_THRESHOLD)) {
196	zone_page_state_add(*p, zone, item);
197	*p = 0;
198	}
199	}
200	EXPORT_SYMBOL(__inc_zone_page_state);
201
202	void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
203	{
204	struct zone *zone = page_zone(page);
205	s8 *p = diff_pointer(zone, item);
206
207	(*p)--;
208
209	if (unlikely(*p < -STAT_THRESHOLD)) {
210	zone_page_state_add(*p, zone, item);
211	*p = 0;
212	}
213	}
214	EXPORT_SYMBOL(__dec_zone_page_state);
215
216	void inc_zone_page_state(struct page *page, enum zone_stat_item item)
217	{
218	unsigned long flags;
219	struct zone *zone;
220	s8 *p;
221
222	zone = page_zone(page);
223	local_irq_save(flags);
224	p = diff_pointer(zone, item);
225
226	(*p)++;
227
228	if (unlikely(*p > STAT_THRESHOLD)) {
229	zone_page_state_add(*p, zone, item);
230	*p = 0;
231	}
232	local_irq_restore(flags);
233	}
234	EXPORT_SYMBOL(inc_zone_page_state);
235
236	void dec_zone_page_state(struct page *page, enum zone_stat_item item)
237	{
238	unsigned long flags;
239	struct zone *zone;
240	s8 *p;
241
242	zone = page_zone(page);
243	local_irq_save(flags);
244	p = diff_pointer(zone, item);
245
246	(*p)--;
247
248	if (unlikely(*p < -STAT_THRESHOLD)) {
249	zone_page_state_add(*p, zone, item);
250	*p = 0;
251	}
252	local_irq_restore(flags);
253	}
254	EXPORT_SYMBOL(dec_zone_page_state);
255
256	/*
257	* Update the zone counters for one cpu.
258	*/
259	void refresh_cpu_vm_stats(int cpu)
260	{
261	struct zone *zone;
262	int i;
263	unsigned long flags;
264
265	for_each_zone(zone) {
266	struct per_cpu_pageset *pcp;
267
268	pcp = zone_pcp(zone, cpu);
269
270	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
271	if (pcp->vm_stat_diff[i]) {
272	local_irq_save(flags);
273	zone_page_state_add(pcp->vm_stat_diff[i],
274	zone, i);
275	pcp->vm_stat_diff[i] = 0;
276	local_irq_restore(flags);
277	}
278	}
279	}
280
281	static void __refresh_cpu_vm_stats(void *dummy)
282	{
283	refresh_cpu_vm_stats(smp_processor_id());
284	}
285
286	/*
287	* Consolidate all counters.
288	*
289	* Note that the result is less inaccurate but still inaccurate
290	* if concurrent processes are allowed to run.
291	*/
292	void refresh_vm_stats(void)
293	{
294	on_each_cpu(__refresh_cpu_vm_stats, NULL, 0, 1);
295	}
296	EXPORT_SYMBOL(refresh_vm_stats);
297
298	#endif
299
f6ac2354 CL	300	#ifdef CONFIG_PROC_FS
	301
	302	#include <linux/seq_file.h>
	303
	304	static void frag_start(struct seq_file m, loff_t *pos)
	305	{
	306	pg_data_t *pgdat;
	307	loff_t node = *pos;
	308	for (pgdat = first_online_pgdat();
	309	pgdat && node;
	310	pgdat = next_online_pgdat(pgdat))
	311	--node;
	312
	313	return pgdat;
	314	}
	315
	316	static void frag_next(struct seq_file m, void arg, loff_t pos)
	317	{
	318	pg_data_t pgdat = (pg_data_t )arg;
	319
	320	(*pos)++;
	321	return next_online_pgdat(pgdat);
	322	}
	323
	324	static void frag_stop(struct seq_file m, void arg)
	325	{
	326	}
	327
	328	/*
	329	* This walks the free areas for each zone.
	330	*/
	331	static int frag_show(struct seq_file m, void arg)
	332	{
	333	pg_data_t pgdat = (pg_data_t )arg;
	334	struct zone *zone;
	335	struct zone *node_zones = pgdat->node_zones;
	336	unsigned long flags;
	337	int order;
	338
	339	for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
	340	if (!populated_zone(zone))
	341	continue;
	342
	343	spin_lock_irqsave(&zone->lock, flags);
	344	seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
	345	for (order = 0; order < MAX_ORDER; ++order)
	346	seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
	347	spin_unlock_irqrestore(&zone->lock, flags);
	348	seq_putc(m, '\n');
	349	}
	350	return 0;
	351	}
	352
	353	struct seq_operations fragmentation_op = {
	354	.start = frag_start,
	355	.next = frag_next,
	356	.stop = frag_stop,
	357	.show = frag_show,
	358	};
	359
	360	static char *vmstat_text[] = {
2244b95a	361	/* Zoned VM counters */
f3dbd344	362	"nr_anon_pages",
65ba55f5	363	"nr_mapped",
347ce434	364	"nr_file_pages",
9a865ffa	365	"nr_slab",
df849a15	366	"nr_page_table_pages",
b1e7a8fd	367	"nr_dirty",
ce866b34	368	"nr_writeback",
f6ac2354	369	"nr_unstable",
d2c5e30c	370	"nr_bounce",
f6ac2354	371
fd39fc85	372	/* Event counters */
f6ac2354 CL	373	"pgpgin",
	374	"pgpgout",
	375	"pswpin",
	376	"pswpout",
	377
	378	"pgalloc_high",
	379	"pgalloc_normal",
	380	"pgalloc_dma32",
	381	"pgalloc_dma",
	382
	383	"pgfree",
	384	"pgactivate",
	385	"pgdeactivate",
	386
	387	"pgfault",
	388	"pgmajfault",
	389
	390	"pgrefill_high",
	391	"pgrefill_normal",
	392	"pgrefill_dma32",
	393	"pgrefill_dma",
	394
	395	"pgsteal_high",
	396	"pgsteal_normal",
	397	"pgsteal_dma32",
	398	"pgsteal_dma",
	399
	400	"pgscan_kswapd_high",
	401	"pgscan_kswapd_normal",
	402	"pgscan_kswapd_dma32",
	403	"pgscan_kswapd_dma",
	404
	405	"pgscan_direct_high",
	406	"pgscan_direct_normal",
	407	"pgscan_direct_dma32",
	408	"pgscan_direct_dma",
	409
	410	"pginodesteal",
	411	"slabs_scanned",
	412	"kswapd_steal",
	413	"kswapd_inodesteal",
	414	"pageoutrun",
	415	"allocstall",
	416
	417	"pgrotated",
f6ac2354 CL	418	};
	419
	420	/*
	421	* Output information about zones in @pgdat.
	422	*/
	423	static int zoneinfo_show(struct seq_file m, void arg)
	424	{
	425	pg_data_t *pgdat = arg;
	426	struct zone *zone;
	427	struct zone *node_zones = pgdat->node_zones;
	428	unsigned long flags;
	429
	430	for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
	431	int i;
	432
	433	if (!populated_zone(zone))
	434	continue;
	435
	436	spin_lock_irqsave(&zone->lock, flags);
	437	seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
	438	seq_printf(m,
	439	"\n pages free %lu"
	440	"\n min %lu"
	441	"\n low %lu"
	442	"\n high %lu"
	443	"\n active %lu"
	444	"\n inactive %lu"
	445	"\n scanned %lu (a: %lu i: %lu)"
	446	"\n spanned %lu"
	447	"\n present %lu",
	448	zone->free_pages,
	449	zone->pages_min,
	450	zone->pages_low,
	451	zone->pages_high,
	452	zone->nr_active,
	453	zone->nr_inactive,
	454	zone->pages_scanned,
	455	zone->nr_scan_active, zone->nr_scan_inactive,
	456	zone->spanned_pages,
	457	zone->present_pages);
2244b95a CL	458
	459	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
	460	seq_printf(m, "\n %-12s %lu", vmstat_text[i],
	461	zone_page_state(zone, i));
	462
f6ac2354 CL	463	seq_printf(m,
	464	"\n protection: (%lu",
	465	zone->lowmem_reserve[0]);
	466	for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
	467	seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
	468	seq_printf(m,
	469	")"
	470	"\n pagesets");
	471	for_each_online_cpu(i) {
	472	struct per_cpu_pageset *pageset;
	473	int j;
	474
	475	pageset = zone_pcp(zone, i);
	476	for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
	477	if (pageset->pcp[j].count)
	478	break;
	479	}
	480	if (j == ARRAY_SIZE(pageset->pcp))
	481	continue;
	482	for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
	483	seq_printf(m,
	484	"\n cpu: %i pcp: %i"
	485	"\n count: %i"
	486	"\n high: %i"
	487	"\n batch: %i",
	488	i, j,
	489	pageset->pcp[j].count,
	490	pageset->pcp[j].high,
	491	pageset->pcp[j].batch);
	492	}
	493	#ifdef CONFIG_NUMA
	494	seq_printf(m,
	495	"\n numa_hit: %lu"
	496	"\n numa_miss: %lu"
	497	"\n numa_foreign: %lu"
	498	"\n interleave_hit: %lu"
	499	"\n local_node: %lu"
	500	"\n other_node: %lu",
	501	pageset->numa_hit,
	502	pageset->numa_miss,
	503	pageset->numa_foreign,
	504	pageset->interleave_hit,
	505	pageset->local_node,
	506	pageset->other_node);
	507	#endif
	508	}
	509	seq_printf(m,
	510	"\n all_unreclaimable: %u"
	511	"\n prev_priority: %i"
	512	"\n temp_priority: %i"
	513	"\n start_pfn: %lu",
	514	zone->all_unreclaimable,
	515	zone->prev_priority,
	516	zone->temp_priority,
	517	zone->zone_start_pfn);
	518	spin_unlock_irqrestore(&zone->lock, flags);
	519	seq_putc(m, '\n');
	520	}
	521	return 0;
	522	}
	523
	524	struct seq_operations zoneinfo_op = {
	525	.start = frag_start, /* iterate over all zones. The same as in
	526	* fragmentation. */
527	.next = frag_next,
528	.stop = frag_stop,
529	.show = zoneinfo_show,
530	};
531
532	static void vmstat_start(struct seq_file m, loff_t *pos)
533	{
2244b95a	534	unsigned long *v;
f6ac2354	535	struct page_state *ps;
2244b95a	536	int i;
f6ac2354 CL	537
	538	if (*pos >= ARRAY_SIZE(vmstat_text))
	539	return NULL;
	540
2244b95a CL	541	v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long)
	542	+ sizeof(*ps), GFP_KERNEL);
	543	m->private = v;
	544	if (!v)
f6ac2354	545	return ERR_PTR(-ENOMEM);
2244b95a CL	546	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
	547	v[i] = global_page_state(i);
	548	ps = (struct page_state *)(v + NR_VM_ZONE_STAT_ITEMS);
f6ac2354 CL	549	get_full_page_state(ps);
	550	ps->pgpgin /= 2; /* sectors -> kbytes */
	551	ps->pgpgout /= 2;
2244b95a	552	return v + *pos;
f6ac2354 CL	553	}
	554
	555	static void vmstat_next(struct seq_file m, void arg, loff_t pos)
	556	{
	557	(*pos)++;
	558	if (*pos >= ARRAY_SIZE(vmstat_text))
	559	return NULL;
	560	return (unsigned long )m->private + pos;
	561	}
	562
	563	static int vmstat_show(struct seq_file m, void arg)
	564	{
	565	unsigned long *l = arg;
	566	unsigned long off = l - (unsigned long *)m->private;
	567
	568	seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
	569	return 0;
	570	}
	571
	572	static void vmstat_stop(struct seq_file m, void arg)
	573	{
	574	kfree(m->private);
	575	m->private = NULL;
	576	}
	577
	578	struct seq_operations vmstat_op = {
	579	.start = vmstat_start,
	580	.next = vmstat_next,
	581	.stop = vmstat_stop,
	582	.show = vmstat_show,
	583	};
	584
	585	#endif /* CONFIG_PROC_FS */
	586