Linux kernel mirror (for testing)
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linux
1#ifndef _LINUX_VMSTAT_H
2#define _LINUX_VMSTAT_H
3
4#include <linux/types.h>
5#include <linux/percpu.h>
6#include <linux/mm.h>
7#include <linux/mmzone.h>
8#include <asm/atomic.h>
9
10#ifdef CONFIG_ZONE_DMA
11#define DMA_ZONE(xx) xx##_DMA,
12#else
13#define DMA_ZONE(xx)
14#endif
15
16#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
28#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
29
30enum 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
41};
42
43#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
54struct vm_event_state {
55 unsigned long event[NR_VM_EVENT_ITEMS];
56};
57
58DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
59
60static inline void __count_vm_event(enum vm_event_item item)
61{
62 __get_cpu_var(vm_event_states).event[item]++;
63}
64
65static inline void count_vm_event(enum vm_event_item item)
66{
67 get_cpu_var(vm_event_states).event[item]++;
68 put_cpu();
69}
70
71static inline void __count_vm_events(enum vm_event_item item, long delta)
72{
73 __get_cpu_var(vm_event_states).event[item] += delta;
74}
75
76static inline void count_vm_events(enum vm_event_item item, long delta)
77{
78 get_cpu_var(vm_event_states).event[item] += delta;
79 put_cpu();
80}
81
82extern void all_vm_events(unsigned long *);
83#ifdef CONFIG_HOTPLUG
84extern void vm_events_fold_cpu(int cpu);
85#else
86static inline void vm_events_fold_cpu(int cpu)
87{
88}
89#endif
90
91#else
92
93/* Disable counters */
94static 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}
112
113#endif /* CONFIG_VM_EVENT_COUNTERS */
114
115#define __count_zone_vm_events(item, zone, delta) \
116 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
117 zone_idx(zone), delta)
118
119/*
120 * Zone based page accounting with per cpu differentials.
121 */
122extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
123
124static 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
164#ifdef CONFIG_ZONE_DMA
165 zone_page_state(&zones[ZONE_DMA], item) +
166#endif
167#ifdef CONFIG_ZONE_DMA32
168 zone_page_state(&zones[ZONE_DMA32], item) +
169#endif
170#ifdef CONFIG_HIGHMEM
171 zone_page_state(&zones[ZONE_HIGHMEM], item) +
172#endif
173 zone_page_state(&zones[ZONE_NORMAL], item);
174}
175
176extern void zone_statistics(struct zonelist *, struct zone *);
177
178#else
179
180#define node_page_state(node, item) global_page_state(item)
181#define zone_statistics(_zl,_z) do { } while (0)
182
183#endif /* CONFIG_NUMA */
184
185#define __add_zone_page_state(__z, __i, __d) \
186 __mod_zone_page_state(__z, __i, __d)
187#define __sub_zone_page_state(__z, __i, __d) \
188 __mod_zone_page_state(__z, __i,-(__d))
189
190#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
191#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
192
193static inline void zap_zone_vm_stats(struct zone *zone)
194{
195 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
196}
197
198extern void inc_zone_state(struct zone *, enum zone_stat_item);
199
200#ifdef CONFIG_SMP
201void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
202void __inc_zone_page_state(struct page *, enum zone_stat_item);
203void __dec_zone_page_state(struct page *, enum zone_stat_item);
204
205void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
206void inc_zone_page_state(struct page *, enum zone_stat_item);
207void dec_zone_page_state(struct page *, enum zone_stat_item);
208
209extern void inc_zone_state(struct zone *, enum zone_stat_item);
210extern void __inc_zone_state(struct zone *, enum zone_stat_item);
211extern void dec_zone_state(struct zone *, enum zone_stat_item);
212extern void __dec_zone_state(struct zone *, enum zone_stat_item);
213
214void refresh_cpu_vm_stats(int);
215#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
227static 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
233static inline void __inc_zone_page_state(struct page *page,
234 enum zone_stat_item item)
235{
236 __inc_zone_state(page_zone(page), item);
237}
238
239static 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
245static inline void __dec_zone_page_state(struct page *page,
246 enum zone_stat_item item)
247{
248 atomic_long_dec(&page_zone(page)->vm_stat[item]);
249 atomic_long_dec(&vm_stat[item]);
250}
251
252/*
253 * We only use atomic operations to update counters. So there is no need to
254 * disable interrupts.
255 */
256#define inc_zone_page_state __inc_zone_page_state
257#define dec_zone_page_state __dec_zone_page_state
258#define mod_zone_page_state __mod_zone_page_state
259
260static inline void refresh_cpu_vm_stats(int cpu) { }
261#endif
262
263#endif /* _LINUX_VMSTAT_H */