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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
Mel Gorman2a1e2742007-07-17 04:03:12 -070028#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 -070029
Christoph Lameterf8891e52006-06-30 01:55:45 -070030enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
31 FOR_ALL_ZONES(PGALLOC),
32 PGFREE, PGACTIVATE, PGDEACTIVATE,
33 PGFAULT, PGMAJFAULT,
34 FOR_ALL_ZONES(PGREFILL),
35 FOR_ALL_ZONES(PGSTEAL),
36 FOR_ALL_ZONES(PGSCAN_KSWAPD),
37 FOR_ALL_ZONES(PGSCAN_DIRECT),
38 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
39 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
40 NR_VM_EVENT_ITEMS
Christoph Lameterf6ac2352006-06-30 01:55:32 -070041};
42
Andrew Morton780a0652007-02-10 01:44:41 -080043#ifdef CONFIG_VM_EVENT_COUNTERS
44/*
45 * Light weight per cpu counter implementation.
46 *
47 * Counters should only be incremented and no critical kernel component
48 * should rely on the counter values.
49 *
50 * Counters are handled completely inline. On many platforms the code
51 * generated will simply be the increment of a global address.
52 */
53
Christoph Lameterf8891e52006-06-30 01:55:45 -070054struct vm_event_state {
55 unsigned long event[NR_VM_EVENT_ITEMS];
56};
Christoph Lameterf6ac2352006-06-30 01:55:32 -070057
Christoph Lameterf8891e52006-06-30 01:55:45 -070058DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
Christoph Lameterf6ac2352006-06-30 01:55:32 -070059
Christoph Lameterf8891e52006-06-30 01:55:45 -070060static inline void __count_vm_event(enum vm_event_item item)
61{
Jan Blunck38cbcdc2006-08-05 12:14:14 -070062 __get_cpu_var(vm_event_states).event[item]++;
Christoph Lameterf8891e52006-06-30 01:55:45 -070063}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070064
Christoph Lameterf8891e52006-06-30 01:55:45 -070065static inline void count_vm_event(enum vm_event_item item)
66{
Jan Blunck38cbcdc2006-08-05 12:14:14 -070067 get_cpu_var(vm_event_states).event[item]++;
Christoph Lameterf8891e52006-06-30 01:55:45 -070068 put_cpu();
69}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070070
Christoph Lameterf8891e52006-06-30 01:55:45 -070071static inline void __count_vm_events(enum vm_event_item item, long delta)
72{
Jan Blunck38cbcdc2006-08-05 12:14:14 -070073 __get_cpu_var(vm_event_states).event[item] += delta;
Christoph Lameterf8891e52006-06-30 01:55:45 -070074}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070075
Christoph Lameterf8891e52006-06-30 01:55:45 -070076static inline void count_vm_events(enum vm_event_item item, long delta)
77{
Jan Blunck38cbcdc2006-08-05 12:14:14 -070078 get_cpu_var(vm_event_states).event[item] += delta;
Christoph Lameterf8891e52006-06-30 01:55:45 -070079 put_cpu();
80}
Christoph Lameterf6ac2352006-06-30 01:55:32 -070081
Christoph Lameterf8891e52006-06-30 01:55:45 -070082extern void all_vm_events(unsigned long *);
Magnus Damme9033872006-12-22 01:08:01 -080083#ifdef CONFIG_HOTPLUG
Christoph Lameterf8891e52006-06-30 01:55:45 -070084extern void vm_events_fold_cpu(int cpu);
Magnus Damme9033872006-12-22 01:08:01 -080085#else
86static inline void vm_events_fold_cpu(int cpu)
87{
88}
89#endif
Christoph Lameterf6ac2352006-06-30 01:55:32 -070090
Christoph Lameterf8891e52006-06-30 01:55:45 -070091#else
Christoph Lameterf6ac2352006-06-30 01:55:32 -070092
Christoph Lameterf8891e52006-06-30 01:55:45 -070093/* Disable counters */
Andrew Morton780a0652007-02-10 01:44:41 -080094static inline void count_vm_event(enum vm_event_item item)
95{
96}
97static inline void count_vm_events(enum vm_event_item item, long delta)
98{
99}
100static inline void __count_vm_event(enum vm_event_item item)
101{
102}
103static inline void __count_vm_events(enum vm_event_item item, long delta)
104{
105}
106static inline void all_vm_events(unsigned long *ret)
107{
108}
109static inline void vm_events_fold_cpu(int cpu)
110{
111}
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700112
Christoph Lameterf8891e52006-06-30 01:55:45 -0700113#endif /* CONFIG_VM_EVENT_COUNTERS */
114
115#define __count_zone_vm_events(item, zone, delta) \
Christoph Lameter4b51d662007-02-10 01:43:10 -0800116 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
117 zone_idx(zone), delta)
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700118
Christoph Lameter2244b952006-06-30 01:55:33 -0700119/*
120 * Zone based page accounting with per cpu differentials.
121 */
122extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700123
Christoph Lameter2244b952006-06-30 01:55:33 -0700124static inline void zone_page_state_add(long x, struct zone *zone,
125 enum zone_stat_item item)
126{
127 atomic_long_add(x, &zone->vm_stat[item]);
128 atomic_long_add(x, &vm_stat[item]);
129}
130
131static inline unsigned long global_page_state(enum zone_stat_item item)
132{
133 long x = atomic_long_read(&vm_stat[item]);
134#ifdef CONFIG_SMP
135 if (x < 0)
136 x = 0;
137#endif
138 return x;
139}
140
141static inline unsigned long zone_page_state(struct zone *zone,
142 enum zone_stat_item item)
143{
144 long x = atomic_long_read(&zone->vm_stat[item]);
145#ifdef CONFIG_SMP
146 if (x < 0)
147 x = 0;
148#endif
149 return x;
150}
151
152#ifdef CONFIG_NUMA
153/*
154 * Determine the per node value of a stat item. This function
155 * is called frequently in a NUMA machine, so try to be as
156 * frugal as possible.
157 */
158static inline unsigned long node_page_state(int node,
159 enum zone_stat_item item)
160{
161 struct zone *zones = NODE_DATA(node)->node_zones;
162
163 return
Christoph Lameter4b51d662007-02-10 01:43:10 -0800164#ifdef CONFIG_ZONE_DMA
165 zone_page_state(&zones[ZONE_DMA], item) +
166#endif
Christoph Lameterfb0e7942006-09-25 23:31:13 -0700167#ifdef CONFIG_ZONE_DMA32
Christoph Lameter2244b952006-06-30 01:55:33 -0700168 zone_page_state(&zones[ZONE_DMA32], item) +
169#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700170#ifdef CONFIG_HIGHMEM
171 zone_page_state(&zones[ZONE_HIGHMEM], item) +
172#endif
Mel Gorman2a1e2742007-07-17 04:03:12 -0700173 zone_page_state(&zones[ZONE_NORMAL], item) +
174 zone_page_state(&zones[ZONE_MOVABLE], item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700175}
Christoph Lameterca889e62006-06-30 01:55:44 -0700176
177extern void zone_statistics(struct zonelist *, struct zone *);
178
Christoph Lameter2244b952006-06-30 01:55:33 -0700179#else
Christoph Lameterca889e62006-06-30 01:55:44 -0700180
Christoph Lameter2244b952006-06-30 01:55:33 -0700181#define node_page_state(node, item) global_page_state(item)
Christoph Lameterca889e62006-06-30 01:55:44 -0700182#define zone_statistics(_zl,_z) do { } while (0)
183
184#endif /* CONFIG_NUMA */
Christoph Lameter2244b952006-06-30 01:55:33 -0700185
186#define __add_zone_page_state(__z, __i, __d) \
187 __mod_zone_page_state(__z, __i, __d)
188#define __sub_zone_page_state(__z, __i, __d) \
189 __mod_zone_page_state(__z, __i,-(__d))
190
191#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
192#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
193
194static inline void zap_zone_vm_stats(struct zone *zone)
195{
196 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
197}
198
Christoph Lameterca889e62006-06-30 01:55:44 -0700199extern void inc_zone_state(struct zone *, enum zone_stat_item);
200
Christoph Lameter2244b952006-06-30 01:55:33 -0700201#ifdef CONFIG_SMP
202void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
203void __inc_zone_page_state(struct page *, enum zone_stat_item);
204void __dec_zone_page_state(struct page *, enum zone_stat_item);
205
206void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
207void inc_zone_page_state(struct page *, enum zone_stat_item);
208void dec_zone_page_state(struct page *, enum zone_stat_item);
209
210extern void inc_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameterc8785382007-02-10 01:43:01 -0800211extern void __inc_zone_state(struct zone *, enum zone_stat_item);
212extern void dec_zone_state(struct zone *, enum zone_stat_item);
213extern void __dec_zone_state(struct zone *, enum zone_stat_item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700214
215void refresh_cpu_vm_stats(int);
Christoph Lameter2244b952006-06-30 01:55:33 -0700216#else /* CONFIG_SMP */
217
218/*
219 * We do not maintain differentials in a single processor configuration.
220 * The functions directly modify the zone and global counters.
221 */
222static inline void __mod_zone_page_state(struct zone *zone,
223 enum zone_stat_item item, int delta)
224{
225 zone_page_state_add(delta, zone, item);
226}
227
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700228static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
229{
230 atomic_long_inc(&zone->vm_stat[item]);
231 atomic_long_inc(&vm_stat[item]);
232}
233
Christoph Lameter2244b952006-06-30 01:55:33 -0700234static inline void __inc_zone_page_state(struct page *page,
235 enum zone_stat_item item)
236{
Christoph Lameter7f4599e2006-07-10 04:44:30 -0700237 __inc_zone_state(page_zone(page), item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700238}
239
Christoph Lameterc8785382007-02-10 01:43:01 -0800240static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
241{
242 atomic_long_dec(&zone->vm_stat[item]);
243 atomic_long_dec(&vm_stat[item]);
244}
245
Christoph Lameter2244b952006-06-30 01:55:33 -0700246static inline void __dec_zone_page_state(struct page *page,
247 enum zone_stat_item item)
248{
249 atomic_long_dec(&page_zone(page)->vm_stat[item]);
250 atomic_long_dec(&vm_stat[item]);
251}
252
253/*
254 * We only use atomic operations to update counters. So there is no need to
255 * disable interrupts.
256 */
257#define inc_zone_page_state __inc_zone_page_state
258#define dec_zone_page_state __dec_zone_page_state
259#define mod_zone_page_state __mod_zone_page_state
260
261static inline void refresh_cpu_vm_stats(int cpu) { }
Christoph Lameter2244b952006-06-30 01:55:33 -0700262#endif
263
264#endif /* _LINUX_VMSTAT_H */