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Christoph Lameterf6ac2352006-06-30 01:55:32 -07001#ifndef _LINUX_VMSTAT_H
2#define _LINUX_VMSTAT_H
3
4#include <linux/types.h>
5#include <linux/percpu.h>
Christoph Lameter96177292007-02-10 01:43:03 -08006#include <linux/mm.h>
Christoph Lameter2244b952006-06-30 01:55:33 -07007#include <linux/mmzone.h>
Andrew Mortonf042e702011-05-26 16:25:24 -07008#include <linux/vm_event_item.h>
Arun Sharma600634972011-07-26 16:09:06 -07009#include <linux/atomic.h>
Christoph Lameterf6ac2352006-06-30 01:55:32 -070010
Adrian Bunkc748e132008-07-23 21:27:03 -070011extern int sysctl_stat_interval;
12
Andrew Morton780a0652007-02-10 01:44:41 -080013#ifdef CONFIG_VM_EVENT_COUNTERS
14/*
15 * Light weight per cpu counter implementation.
16 *
17 * Counters should only be incremented and no critical kernel component
18 * should rely on the counter values.
19 *
20 * Counters are handled completely inline. On many platforms the code
21 * generated will simply be the increment of a global address.
22 */
23
Christoph Lameterf8891e52006-06-30 01:55:45 -070024struct vm_event_state {
25 unsigned long event[NR_VM_EVENT_ITEMS];
26};
Christoph Lameterf6ac2352006-06-30 01:55:32 -070027
Christoph Lameterf8891e52006-06-30 01:55:45 -070028DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
Christoph Lameterf6ac2352006-06-30 01:55:32 -070029
Christoph Lameterf8891e52006-06-30 01:55:45 -070030static inline void __count_vm_event(enum vm_event_item item)
31{
Rusty Russelldd17c8f2009-10-29 22:34:15 +090032 __this_cpu_inc(vm_event_states.event[item]);
Christoph Lameterf8891e52006-06-30 01:55:45 -070033}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070034
Christoph Lameterf8891e52006-06-30 01:55:45 -070035static inline void count_vm_event(enum vm_event_item item)
36{
Rusty Russelldd17c8f2009-10-29 22:34:15 +090037 this_cpu_inc(vm_event_states.event[item]);
Christoph Lameterf8891e52006-06-30 01:55:45 -070038}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070039
Christoph Lameterf8891e52006-06-30 01:55:45 -070040static inline void __count_vm_events(enum vm_event_item item, long delta)
41{
Rusty Russelldd17c8f2009-10-29 22:34:15 +090042 __this_cpu_add(vm_event_states.event[item], delta);
Christoph Lameterf8891e52006-06-30 01:55:45 -070043}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070044
Christoph Lameterf8891e52006-06-30 01:55:45 -070045static inline void count_vm_events(enum vm_event_item item, long delta)
46{
Rusty Russelldd17c8f2009-10-29 22:34:15 +090047 this_cpu_add(vm_event_states.event[item], delta);
Christoph Lameterf8891e52006-06-30 01:55:45 -070048}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070049
Christoph Lameterf8891e52006-06-30 01:55:45 -070050extern void all_vm_events(unsigned long *);
Yijing Wangf1cb0872013-04-29 15:08:14 -070051
Christoph Lameterf8891e52006-06-30 01:55:45 -070052extern void vm_events_fold_cpu(int cpu);
Christoph Lameterf6ac2352006-06-30 01:55:32 -070053
Christoph Lameterf8891e52006-06-30 01:55:45 -070054#else
Christoph Lameterf6ac2352006-06-30 01:55:32 -070055
Christoph Lameterf8891e52006-06-30 01:55:45 -070056/* Disable counters */
Andrew Morton780a0652007-02-10 01:44:41 -080057static inline void count_vm_event(enum vm_event_item item)
58{
59}
60static inline void count_vm_events(enum vm_event_item item, long delta)
61{
62}
63static inline void __count_vm_event(enum vm_event_item item)
64{
65}
66static inline void __count_vm_events(enum vm_event_item item, long delta)
67{
68}
69static inline void all_vm_events(unsigned long *ret)
70{
71}
72static inline void vm_events_fold_cpu(int cpu)
73{
74}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070075
Christoph Lameterf8891e52006-06-30 01:55:45 -070076#endif /* CONFIG_VM_EVENT_COUNTERS */
77
Mel Gorman03c5a6e2012-11-02 14:52:48 +000078#ifdef CONFIG_NUMA_BALANCING
79#define count_vm_numa_event(x) count_vm_event(x)
80#define count_vm_numa_events(x, y) count_vm_events(x, y)
81#else
82#define count_vm_numa_event(x) do {} while (0)
Mel Gorman3c0ff462013-02-22 16:34:29 -080083#define count_vm_numa_events(x, y) do { (void)(y); } while (0)
Mel Gorman03c5a6e2012-11-02 14:52:48 +000084#endif /* CONFIG_NUMA_BALANCING */
85
Christoph Lameterf8891e52006-06-30 01:55:45 -070086#define __count_zone_vm_events(item, zone, delta) \
Christoph Lameter4b51d662007-02-10 01:43:10 -080087 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
88 zone_idx(zone), delta)
Christoph Lameterf6ac2352006-06-30 01:55:32 -070089
Christoph Lameter2244b952006-06-30 01:55:33 -070090/*
91 * Zone based page accounting with per cpu differentials.
92 */
93extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
Christoph Lameterf6ac2352006-06-30 01:55:32 -070094
Christoph Lameter2244b952006-06-30 01:55:33 -070095static inline void zone_page_state_add(long x, struct zone *zone,
96 enum zone_stat_item item)
97{
98 atomic_long_add(x, &zone->vm_stat[item]);
99 atomic_long_add(x, &vm_stat[item]);
100}
101
102static inline unsigned long global_page_state(enum zone_stat_item item)
103{
104 long x = atomic_long_read(&vm_stat[item]);
105#ifdef CONFIG_SMP
106 if (x < 0)
107 x = 0;
108#endif
109 return x;
110}
111
112static inline unsigned long zone_page_state(struct zone *zone,
113 enum zone_stat_item item)
114{
115 long x = atomic_long_read(&zone->vm_stat[item]);
116#ifdef CONFIG_SMP
117 if (x < 0)
118 x = 0;
119#endif
120 return x;
121}
122
Christoph Lameteraa454842010-09-09 16:38:17 -0700123/*
124 * More accurate version that also considers the currently pending
125 * deltas. For that we need to loop over all cpus to find the current
126 * deltas. There is no synchronization so the result cannot be
127 * exactly accurate either.
128 */
129static inline unsigned long zone_page_state_snapshot(struct zone *zone,
130 enum zone_stat_item item)
131{
132 long x = atomic_long_read(&zone->vm_stat[item]);
133
134#ifdef CONFIG_SMP
135 int cpu;
136 for_each_online_cpu(cpu)
137 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
138
139 if (x < 0)
140 x = 0;
141#endif
142 return x;
143}
144
Wu Fengguangadea02a2009-09-21 17:01:42 -0700145extern unsigned long global_reclaimable_pages(void);
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700146
Christoph Lameter2244b952006-06-30 01:55:33 -0700147#ifdef CONFIG_NUMA
148/*
149 * Determine the per node value of a stat item. This function
150 * is called frequently in a NUMA machine, so try to be as
151 * frugal as possible.
152 */
153static inline unsigned long node_page_state(int node,
154 enum zone_stat_item item)
155{
156 struct zone *zones = NODE_DATA(node)->node_zones;
157
158 return
Christoph Lameter4b51d662007-02-10 01:43:10 -0800159#ifdef CONFIG_ZONE_DMA
160 zone_page_state(&zones[ZONE_DMA], item) +
161#endif
Christoph Lameterfb0e7942006-09-25 23:31:13 -0700162#ifdef CONFIG_ZONE_DMA32
Christoph Lameter2244b952006-06-30 01:55:33 -0700163 zone_page_state(&zones[ZONE_DMA32], item) +
164#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700165#ifdef CONFIG_HIGHMEM
166 zone_page_state(&zones[ZONE_HIGHMEM], item) +
167#endif
Mel Gorman2a1e2742007-07-17 04:03:12 -0700168 zone_page_state(&zones[ZONE_NORMAL], item) +
169 zone_page_state(&zones[ZONE_MOVABLE], item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700170}
Christoph Lameterca889e62006-06-30 01:55:44 -0700171
Andi Kleen78afd562011-03-22 16:33:12 -0700172extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
Christoph Lameterca889e62006-06-30 01:55:44 -0700173
Christoph Lameter2244b952006-06-30 01:55:33 -0700174#else
Christoph Lameterca889e62006-06-30 01:55:44 -0700175
Christoph Lameter2244b952006-06-30 01:55:33 -0700176#define node_page_state(node, item) global_page_state(item)
Andi Kleen78afd562011-03-22 16:33:12 -0700177#define zone_statistics(_zl, _z, gfp) do { } while (0)
Christoph Lameterca889e62006-06-30 01:55:44 -0700178
179#endif /* CONFIG_NUMA */
Christoph Lameter2244b952006-06-30 01:55:33 -0700180
Christoph Lameter2244b952006-06-30 01:55:33 -0700181#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
182#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
183
Christoph Lameterca889e62006-06-30 01:55:44 -0700184extern void inc_zone_state(struct zone *, enum zone_stat_item);
185
Christoph Lameter2244b952006-06-30 01:55:33 -0700186#ifdef CONFIG_SMP
187void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
188void __inc_zone_page_state(struct page *, enum zone_stat_item);
189void __dec_zone_page_state(struct page *, enum zone_stat_item);
190
191void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
192void inc_zone_page_state(struct page *, enum zone_stat_item);
193void dec_zone_page_state(struct page *, enum zone_stat_item);
194
195extern void inc_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameterc8785382007-02-10 01:43:01 -0800196extern void __inc_zone_state(struct zone *, enum zone_stat_item);
197extern void dec_zone_state(struct zone *, enum zone_stat_item);
198extern void __dec_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700199
Christoph Lameter2bb921e2013-09-11 14:21:30 -0700200void cpu_vm_stats_fold(int cpu);
KOSAKI Motohiroa6cccdc2011-05-24 17:11:33 -0700201void refresh_zone_stat_thresholds(void);
Mel Gormanb44129b2011-01-13 15:45:43 -0800202
Minchan Kim5a883812012-10-08 16:33:39 -0700203void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
204
Mel Gormanb44129b2011-01-13 15:45:43 -0800205int calculate_pressure_threshold(struct zone *zone);
206int calculate_normal_threshold(struct zone *zone);
207void set_pgdat_percpu_threshold(pg_data_t *pgdat,
208 int (*calculate_pressure)(struct zone *));
Christoph Lameter2244b952006-06-30 01:55:33 -0700209#else /* CONFIG_SMP */
210
211/*
212 * We do not maintain differentials in a single processor configuration.
213 * The functions directly modify the zone and global counters.
214 */
215static inline void __mod_zone_page_state(struct zone *zone,
216 enum zone_stat_item item, int delta)
217{
218 zone_page_state_add(delta, zone, item);
219}
220
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700221static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
222{
223 atomic_long_inc(&zone->vm_stat[item]);
224 atomic_long_inc(&vm_stat[item]);
225}
226
Christoph Lameter2244b952006-06-30 01:55:33 -0700227static inline void __inc_zone_page_state(struct page *page,
228 enum zone_stat_item item)
229{
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700230 __inc_zone_state(page_zone(page), item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700231}
232
Christoph Lameterc8785382007-02-10 01:43:01 -0800233static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
234{
235 atomic_long_dec(&zone->vm_stat[item]);
236 atomic_long_dec(&vm_stat[item]);
237}
238
Christoph Lameter2244b952006-06-30 01:55:33 -0700239static inline void __dec_zone_page_state(struct page *page,
240 enum zone_stat_item item)
241{
Uwe Kleine-König57ce36f2008-02-25 16:45:03 +0100242 __dec_zone_state(page_zone(page), item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700243}
244
245/*
246 * We only use atomic operations to update counters. So there is no need to
247 * disable interrupts.
248 */
249#define inc_zone_page_state __inc_zone_page_state
250#define dec_zone_page_state __dec_zone_page_state
251#define mod_zone_page_state __mod_zone_page_state
252
Mel Gormanb44129b2011-01-13 15:45:43 -0800253#define set_pgdat_percpu_threshold(pgdat, callback) { }
Mel Gorman88f5acf2011-01-13 15:45:41 -0800254
Christoph Lameter2244b952006-06-30 01:55:33 -0700255static inline void refresh_cpu_vm_stats(int cpu) { }
KOSAKI Motohiroa6cccdc2011-05-24 17:11:33 -0700256static inline void refresh_zone_stat_thresholds(void) { }
Christoph Lameter2bb921e2013-09-11 14:21:30 -0700257static inline void cpu_vm_stats_fold(int cpu) { }
KOSAKI Motohiroa6cccdc2011-05-24 17:11:33 -0700258
Minchan Kim5a883812012-10-08 16:33:39 -0700259static inline void drain_zonestat(struct zone *zone,
260 struct per_cpu_pageset *pset) { }
KOSAKI Motohirofa25c502011-05-24 17:11:28 -0700261#endif /* CONFIG_SMP */
262
Bartlomiej Zolnierkiewiczd1ce7492012-10-08 16:32:02 -0700263static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
264 int migratetype)
265{
266 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
267 if (is_migrate_cma(migratetype))
268 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
269}
270
KOSAKI Motohirofa25c502011-05-24 17:11:28 -0700271extern const char * const vmstat_text[];
Christoph Lameter2244b952006-06-30 01:55:33 -0700272
273#endif /* _LINUX_VMSTAT_H */