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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>
8#include <asm/atomic.h>
Christoph Lameterf6ac2352006-06-30 01:55:32 -07009
Christoph Lameter4b51d662007-02-10 01:43:10 -080010#ifdef CONFIG_ZONE_DMA
11#define DMA_ZONE(xx) xx##_DMA,
12#else
13#define DMA_ZONE(xx)
14#endif
15
Christoph Lameter27bf71c2006-09-25 23:31:15 -070016#ifdef CONFIG_ZONE_DMA32
17#define DMA32_ZONE(xx) xx##_DMA32,
18#else
19#define DMA32_ZONE(xx)
20#endif
21
22#ifdef CONFIG_HIGHMEM
23#define HIGHMEM_ZONE(xx) , xx##_HIGH
24#else
25#define HIGHMEM_ZONE(xx)
26#endif
27
Adam Litke3b116302008-04-28 02:13:06 -070028
Mel Gorman2a1e2742007-07-17 04:03:12 -070029#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE
Christoph Lameterf6ac2352006-06-30 01:55:32 -070030
Christoph Lameterf8891e52006-06-30 01:55:45 -070031enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
32 FOR_ALL_ZONES(PGALLOC),
33 PGFREE, PGACTIVATE, PGDEACTIVATE,
34 PGFAULT, PGMAJFAULT,
35 FOR_ALL_ZONES(PGREFILL),
36 FOR_ALL_ZONES(PGSTEAL),
37 FOR_ALL_ZONES(PGSCAN_KSWAPD),
38 FOR_ALL_ZONES(PGSCAN_DIRECT),
Mel Gorman24cf725182009-06-16 15:33:23 -070039#ifdef CONFIG_NUMA
40 PGSCAN_ZONE_RECLAIM_FAILED,
41#endif
Christoph Lameterf8891e52006-06-30 01:55:45 -070042 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
KOSAKI Motohirobb3ab592009-12-14 17:58:55 -080043 KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY,
44 KSWAPD_SKIP_CONGESTION_WAIT,
Christoph Lameterf8891e52006-06-30 01:55:45 -070045 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
Mel Gorman748446b2010-05-24 14:32:27 -070046#ifdef CONFIG_COMPACTION
47 COMPACTBLOCKS, COMPACTPAGES, COMPACTPAGEFAILED,
Mel Gorman56de7262010-05-24 14:32:30 -070048 COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,
Mel Gorman748446b2010-05-24 14:32:27 -070049#endif
Adam Litke3b116302008-04-28 02:13:06 -070050#ifdef CONFIG_HUGETLB_PAGE
51 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
52#endif
Lee Schermerhornbbfd28e2008-10-18 20:26:40 -070053 UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
54 UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */
55 UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */
Nick Piggin5344b7e2008-10-18 20:26:51 -070056 UNEVICTABLE_PGMLOCKED,
57 UNEVICTABLE_PGMUNLOCKED,
58 UNEVICTABLE_PGCLEARED, /* on COW, page truncate */
59 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
Lee Schermerhorn985737c2008-10-18 20:26:53 -070060 UNEVICTABLE_MLOCKFREED,
Christoph Lameterf8891e52006-06-30 01:55:45 -070061 NR_VM_EVENT_ITEMS
Christoph Lameterf6ac2352006-06-30 01:55:32 -070062};
63
Adrian Bunkc748e132008-07-23 21:27:03 -070064extern int sysctl_stat_interval;
65
Andrew Morton780a0652007-02-10 01:44:41 -080066#ifdef CONFIG_VM_EVENT_COUNTERS
67/*
68 * Light weight per cpu counter implementation.
69 *
70 * Counters should only be incremented and no critical kernel component
71 * should rely on the counter values.
72 *
73 * Counters are handled completely inline. On many platforms the code
74 * generated will simply be the increment of a global address.
75 */
76
Christoph Lameterf8891e52006-06-30 01:55:45 -070077struct vm_event_state {
78 unsigned long event[NR_VM_EVENT_ITEMS];
79};
Christoph Lameterf6ac2352006-06-30 01:55:32 -070080
Christoph Lameterf8891e52006-06-30 01:55:45 -070081DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
Christoph Lameterf6ac2352006-06-30 01:55:32 -070082
Christoph Lameterf8891e52006-06-30 01:55:45 -070083static inline void __count_vm_event(enum vm_event_item item)
84{
Rusty Russelldd17c8f2009-10-29 22:34:15 +090085 __this_cpu_inc(vm_event_states.event[item]);
Christoph Lameterf8891e52006-06-30 01:55:45 -070086}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070087
Christoph Lameterf8891e52006-06-30 01:55:45 -070088static inline void count_vm_event(enum vm_event_item item)
89{
Rusty Russelldd17c8f2009-10-29 22:34:15 +090090 this_cpu_inc(vm_event_states.event[item]);
Christoph Lameterf8891e52006-06-30 01:55:45 -070091}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070092
Christoph Lameterf8891e52006-06-30 01:55:45 -070093static inline void __count_vm_events(enum vm_event_item item, long delta)
94{
Rusty Russelldd17c8f2009-10-29 22:34:15 +090095 __this_cpu_add(vm_event_states.event[item], delta);
Christoph Lameterf8891e52006-06-30 01:55:45 -070096}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070097
Christoph Lameterf8891e52006-06-30 01:55:45 -070098static inline void count_vm_events(enum vm_event_item item, long delta)
99{
Rusty Russelldd17c8f2009-10-29 22:34:15 +0900100 this_cpu_add(vm_event_states.event[item], delta);
Christoph Lameterf8891e52006-06-30 01:55:45 -0700101}
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700102
Christoph Lameterf8891e52006-06-30 01:55:45 -0700103extern void all_vm_events(unsigned long *);
Magnus Damme9033872006-12-22 01:08:01 -0800104#ifdef CONFIG_HOTPLUG
Christoph Lameterf8891e52006-06-30 01:55:45 -0700105extern void vm_events_fold_cpu(int cpu);
Magnus Damme9033872006-12-22 01:08:01 -0800106#else
107static inline void vm_events_fold_cpu(int cpu)
108{
109}
110#endif
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700111
Christoph Lameterf8891e52006-06-30 01:55:45 -0700112#else
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700113
Christoph Lameterf8891e52006-06-30 01:55:45 -0700114/* Disable counters */
Andrew Morton780a0652007-02-10 01:44:41 -0800115static inline void count_vm_event(enum vm_event_item item)
116{
117}
118static inline void count_vm_events(enum vm_event_item item, long delta)
119{
120}
121static inline void __count_vm_event(enum vm_event_item item)
122{
123}
124static inline void __count_vm_events(enum vm_event_item item, long delta)
125{
126}
127static inline void all_vm_events(unsigned long *ret)
128{
129}
130static inline void vm_events_fold_cpu(int cpu)
131{
132}
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700133
Christoph Lameterf8891e52006-06-30 01:55:45 -0700134#endif /* CONFIG_VM_EVENT_COUNTERS */
135
136#define __count_zone_vm_events(item, zone, delta) \
Christoph Lameter4b51d662007-02-10 01:43:10 -0800137 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
138 zone_idx(zone), delta)
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700139
Christoph Lameter2244b952006-06-30 01:55:33 -0700140/*
141 * Zone based page accounting with per cpu differentials.
142 */
143extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700144
Christoph Lameter2244b952006-06-30 01:55:33 -0700145static inline void zone_page_state_add(long x, struct zone *zone,
146 enum zone_stat_item item)
147{
148 atomic_long_add(x, &zone->vm_stat[item]);
149 atomic_long_add(x, &vm_stat[item]);
150}
151
152static inline unsigned long global_page_state(enum zone_stat_item item)
153{
154 long x = atomic_long_read(&vm_stat[item]);
155#ifdef CONFIG_SMP
156 if (x < 0)
157 x = 0;
158#endif
159 return x;
160}
161
162static inline unsigned long zone_page_state(struct zone *zone,
163 enum zone_stat_item item)
164{
165 long x = atomic_long_read(&zone->vm_stat[item]);
166#ifdef CONFIG_SMP
167 if (x < 0)
168 x = 0;
169#endif
170 return x;
171}
172
Christoph Lameteraa454842010-09-09 16:38:17 -0700173/*
174 * More accurate version that also considers the currently pending
175 * deltas. For that we need to loop over all cpus to find the current
176 * deltas. There is no synchronization so the result cannot be
177 * exactly accurate either.
178 */
179static inline unsigned long zone_page_state_snapshot(struct zone *zone,
180 enum zone_stat_item item)
181{
182 long x = atomic_long_read(&zone->vm_stat[item]);
183
184#ifdef CONFIG_SMP
185 int cpu;
186 for_each_online_cpu(cpu)
187 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
188
189 if (x < 0)
190 x = 0;
191#endif
192 return x;
193}
194
Wu Fengguangadea02a2009-09-21 17:01:42 -0700195extern unsigned long global_reclaimable_pages(void);
196extern unsigned long zone_reclaimable_pages(struct zone *zone);
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700197
Christoph Lameter2244b952006-06-30 01:55:33 -0700198#ifdef CONFIG_NUMA
199/*
200 * Determine the per node value of a stat item. This function
201 * is called frequently in a NUMA machine, so try to be as
202 * frugal as possible.
203 */
204static inline unsigned long node_page_state(int node,
205 enum zone_stat_item item)
206{
207 struct zone *zones = NODE_DATA(node)->node_zones;
208
209 return
Christoph Lameter4b51d662007-02-10 01:43:10 -0800210#ifdef CONFIG_ZONE_DMA
211 zone_page_state(&zones[ZONE_DMA], item) +
212#endif
Christoph Lameterfb0e7942006-09-25 23:31:13 -0700213#ifdef CONFIG_ZONE_DMA32
Christoph Lameter2244b952006-06-30 01:55:33 -0700214 zone_page_state(&zones[ZONE_DMA32], item) +
215#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700216#ifdef CONFIG_HIGHMEM
217 zone_page_state(&zones[ZONE_HIGHMEM], item) +
218#endif
Mel Gorman2a1e2742007-07-17 04:03:12 -0700219 zone_page_state(&zones[ZONE_NORMAL], item) +
220 zone_page_state(&zones[ZONE_MOVABLE], item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700221}
Christoph Lameterca889e62006-06-30 01:55:44 -0700222
Mel Gorman18ea7e72008-04-28 02:12:14 -0700223extern void zone_statistics(struct zone *, struct zone *);
Christoph Lameterca889e62006-06-30 01:55:44 -0700224
Christoph Lameter2244b952006-06-30 01:55:33 -0700225#else
Christoph Lameterca889e62006-06-30 01:55:44 -0700226
Christoph Lameter2244b952006-06-30 01:55:33 -0700227#define node_page_state(node, item) global_page_state(item)
Christoph Lameterca889e62006-06-30 01:55:44 -0700228#define zone_statistics(_zl,_z) do { } while (0)
229
230#endif /* CONFIG_NUMA */
Christoph Lameter2244b952006-06-30 01:55:33 -0700231
Christoph Lameter2244b952006-06-30 01:55:33 -0700232#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
233#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
234
235static inline void zap_zone_vm_stats(struct zone *zone)
236{
237 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
238}
239
Christoph Lameterca889e62006-06-30 01:55:44 -0700240extern void inc_zone_state(struct zone *, enum zone_stat_item);
241
Christoph Lameter2244b952006-06-30 01:55:33 -0700242#ifdef CONFIG_SMP
243void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
244void __inc_zone_page_state(struct page *, enum zone_stat_item);
245void __dec_zone_page_state(struct page *, enum zone_stat_item);
246
247void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
248void inc_zone_page_state(struct page *, enum zone_stat_item);
249void dec_zone_page_state(struct page *, enum zone_stat_item);
250
251extern void inc_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameterc8785382007-02-10 01:43:01 -0800252extern void __inc_zone_state(struct zone *, enum zone_stat_item);
253extern void dec_zone_state(struct zone *, enum zone_stat_item);
254extern void __dec_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700255
256void refresh_cpu_vm_stats(int);
Mel Gormanb44129b2011-01-13 15:45:43 -0800257
258int calculate_pressure_threshold(struct zone *zone);
259int calculate_normal_threshold(struct zone *zone);
260void set_pgdat_percpu_threshold(pg_data_t *pgdat,
261 int (*calculate_pressure)(struct zone *));
Christoph Lameter2244b952006-06-30 01:55:33 -0700262#else /* CONFIG_SMP */
263
264/*
265 * We do not maintain differentials in a single processor configuration.
266 * The functions directly modify the zone and global counters.
267 */
268static inline void __mod_zone_page_state(struct zone *zone,
269 enum zone_stat_item item, int delta)
270{
271 zone_page_state_add(delta, zone, item);
272}
273
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700274static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
275{
276 atomic_long_inc(&zone->vm_stat[item]);
277 atomic_long_inc(&vm_stat[item]);
278}
279
Christoph Lameter2244b952006-06-30 01:55:33 -0700280static inline void __inc_zone_page_state(struct page *page,
281 enum zone_stat_item item)
282{
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700283 __inc_zone_state(page_zone(page), item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700284}
285
Christoph Lameterc8785382007-02-10 01:43:01 -0800286static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
287{
288 atomic_long_dec(&zone->vm_stat[item]);
289 atomic_long_dec(&vm_stat[item]);
290}
291
Christoph Lameter2244b952006-06-30 01:55:33 -0700292static inline void __dec_zone_page_state(struct page *page,
293 enum zone_stat_item item)
294{
Uwe Kleine-König57ce36f2008-02-25 16:45:03 +0100295 __dec_zone_state(page_zone(page), item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700296}
297
298/*
299 * We only use atomic operations to update counters. So there is no need to
300 * disable interrupts.
301 */
302#define inc_zone_page_state __inc_zone_page_state
303#define dec_zone_page_state __dec_zone_page_state
304#define mod_zone_page_state __mod_zone_page_state
305
Mel Gormanb44129b2011-01-13 15:45:43 -0800306#define set_pgdat_percpu_threshold(pgdat, callback) { }
Mel Gorman88f5acf2011-01-13 15:45:41 -0800307
Christoph Lameter2244b952006-06-30 01:55:33 -0700308static inline void refresh_cpu_vm_stats(int cpu) { }
Christoph Lameter2244b952006-06-30 01:55:33 -0700309#endif
310
311#endif /* _LINUX_VMSTAT_H */