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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
Mel Gormanec659932014-01-21 14:33:16 -080086#ifdef CONFIG_DEBUG_TLBFLUSH
87#define count_vm_tlb_event(x) count_vm_event(x)
88#define count_vm_tlb_events(x, y) count_vm_events(x, y)
89#else
90#define count_vm_tlb_event(x) do {} while (0)
91#define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
92#endif
93
Christoph Lameterf8891e52006-06-30 01:55:45 -070094#define __count_zone_vm_events(item, zone, delta) \
Christoph Lameter4b51d662007-02-10 01:43:10 -080095 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
96 zone_idx(zone), delta)
Christoph Lameterf6ac2352006-06-30 01:55:32 -070097
Christoph Lameter2244b952006-06-30 01:55:33 -070098/*
99 * Zone based page accounting with per cpu differentials.
100 */
101extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700102
Christoph Lameter2244b952006-06-30 01:55:33 -0700103static inline void zone_page_state_add(long x, struct zone *zone,
104 enum zone_stat_item item)
105{
106 atomic_long_add(x, &zone->vm_stat[item]);
107 atomic_long_add(x, &vm_stat[item]);
108}
109
110static inline unsigned long global_page_state(enum zone_stat_item item)
111{
112 long x = atomic_long_read(&vm_stat[item]);
113#ifdef CONFIG_SMP
114 if (x < 0)
115 x = 0;
116#endif
117 return x;
118}
119
120static inline unsigned long zone_page_state(struct zone *zone,
121 enum zone_stat_item item)
122{
123 long x = atomic_long_read(&zone->vm_stat[item]);
124#ifdef CONFIG_SMP
125 if (x < 0)
126 x = 0;
127#endif
128 return x;
129}
130
Christoph Lameteraa454842010-09-09 16:38:17 -0700131/*
132 * More accurate version that also considers the currently pending
133 * deltas. For that we need to loop over all cpus to find the current
134 * deltas. There is no synchronization so the result cannot be
135 * exactly accurate either.
136 */
137static inline unsigned long zone_page_state_snapshot(struct zone *zone,
138 enum zone_stat_item item)
139{
140 long x = atomic_long_read(&zone->vm_stat[item]);
141
142#ifdef CONFIG_SMP
143 int cpu;
144 for_each_online_cpu(cpu)
145 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
146
147 if (x < 0)
148 x = 0;
149#endif
150 return x;
151}
152
Christoph Lameter2244b952006-06-30 01:55:33 -0700153#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 */
159static 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
Christoph Lameter4b51d662007-02-10 01:43:10 -0800165#ifdef CONFIG_ZONE_DMA
166 zone_page_state(&zones[ZONE_DMA], item) +
167#endif
Christoph Lameterfb0e7942006-09-25 23:31:13 -0700168#ifdef CONFIG_ZONE_DMA32
Christoph Lameter2244b952006-06-30 01:55:33 -0700169 zone_page_state(&zones[ZONE_DMA32], item) +
170#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700171#ifdef CONFIG_HIGHMEM
172 zone_page_state(&zones[ZONE_HIGHMEM], item) +
173#endif
Mel Gorman2a1e2742007-07-17 04:03:12 -0700174 zone_page_state(&zones[ZONE_NORMAL], item) +
175 zone_page_state(&zones[ZONE_MOVABLE], item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700176}
Christoph Lameterca889e62006-06-30 01:55:44 -0700177
Andi Kleen78afd562011-03-22 16:33:12 -0700178extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
Christoph Lameterca889e62006-06-30 01:55:44 -0700179
Christoph Lameter2244b952006-06-30 01:55:33 -0700180#else
Christoph Lameterca889e62006-06-30 01:55:44 -0700181
Christoph Lameter2244b952006-06-30 01:55:33 -0700182#define node_page_state(node, item) global_page_state(item)
Andi Kleen78afd562011-03-22 16:33:12 -0700183#define zone_statistics(_zl, _z, gfp) do { } while (0)
Christoph Lameterca889e62006-06-30 01:55:44 -0700184
185#endif /* CONFIG_NUMA */
Christoph Lameter2244b952006-06-30 01:55:33 -0700186
Christoph Lameter2244b952006-06-30 01:55:33 -0700187#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
188#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
189
Christoph Lameterca889e62006-06-30 01:55:44 -0700190extern void inc_zone_state(struct zone *, enum zone_stat_item);
191
Christoph Lameter2244b952006-06-30 01:55:33 -0700192#ifdef CONFIG_SMP
193void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
194void __inc_zone_page_state(struct page *, enum zone_stat_item);
195void __dec_zone_page_state(struct page *, enum zone_stat_item);
196
197void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
198void inc_zone_page_state(struct page *, enum zone_stat_item);
199void dec_zone_page_state(struct page *, enum zone_stat_item);
200
201extern void inc_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameterc8785382007-02-10 01:43:01 -0800202extern void __inc_zone_state(struct zone *, enum zone_stat_item);
203extern void dec_zone_state(struct zone *, enum zone_stat_item);
204extern void __dec_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700205
Christoph Lameter2bb921e2013-09-11 14:21:30 -0700206void cpu_vm_stats_fold(int cpu);
KOSAKI Motohiroa6cccdc2011-05-24 17:11:33 -0700207void refresh_zone_stat_thresholds(void);
Mel Gormanb44129b2011-01-13 15:45:43 -0800208
Minchan Kim5a883812012-10-08 16:33:39 -0700209void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
210
Mel Gormanb44129b2011-01-13 15:45:43 -0800211int calculate_pressure_threshold(struct zone *zone);
212int calculate_normal_threshold(struct zone *zone);
213void set_pgdat_percpu_threshold(pg_data_t *pgdat,
214 int (*calculate_pressure)(struct zone *));
Christoph Lameter2244b952006-06-30 01:55:33 -0700215#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 */
221static 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
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700227static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
228{
229 atomic_long_inc(&zone->vm_stat[item]);
230 atomic_long_inc(&vm_stat[item]);
231}
232
Christoph Lameter2244b952006-06-30 01:55:33 -0700233static inline void __inc_zone_page_state(struct page *page,
234 enum zone_stat_item item)
235{
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700236 __inc_zone_state(page_zone(page), item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700237}
238
Christoph Lameterc8785382007-02-10 01:43:01 -0800239static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
240{
241 atomic_long_dec(&zone->vm_stat[item]);
242 atomic_long_dec(&vm_stat[item]);
243}
244
Christoph Lameter2244b952006-06-30 01:55:33 -0700245static inline void __dec_zone_page_state(struct page *page,
246 enum zone_stat_item item)
247{
Uwe Kleine-König57ce36f2008-02-25 16:45:03 +0100248 __dec_zone_state(page_zone(page), item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700249}
250
251/*
252 * We only use atomic operations to update counters. So there is no need to
253 * disable interrupts.
254 */
255#define inc_zone_page_state __inc_zone_page_state
256#define dec_zone_page_state __dec_zone_page_state
257#define mod_zone_page_state __mod_zone_page_state
258
Mel Gormanb44129b2011-01-13 15:45:43 -0800259#define set_pgdat_percpu_threshold(pgdat, callback) { }
Mel Gorman88f5acf2011-01-13 15:45:41 -0800260
Christoph Lameter2244b952006-06-30 01:55:33 -0700261static inline void refresh_cpu_vm_stats(int cpu) { }
KOSAKI Motohiroa6cccdc2011-05-24 17:11:33 -0700262static inline void refresh_zone_stat_thresholds(void) { }
Christoph Lameter2bb921e2013-09-11 14:21:30 -0700263static inline void cpu_vm_stats_fold(int cpu) { }
KOSAKI Motohiroa6cccdc2011-05-24 17:11:33 -0700264
Minchan Kim5a883812012-10-08 16:33:39 -0700265static inline void drain_zonestat(struct zone *zone,
266 struct per_cpu_pageset *pset) { }
KOSAKI Motohirofa25c502011-05-24 17:11:28 -0700267#endif /* CONFIG_SMP */
268
Bartlomiej Zolnierkiewiczd1ce7492012-10-08 16:32:02 -0700269static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
270 int migratetype)
271{
272 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
273 if (is_migrate_cma(migratetype))
274 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
275}
276
KOSAKI Motohirofa25c502011-05-24 17:11:28 -0700277extern const char * const vmstat_text[];
Christoph Lameter2244b952006-06-30 01:55:33 -0700278
279#endif /* _LINUX_VMSTAT_H */