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/mmzone.h>
7#include <asm/atomic.h>
8
9#ifdef CONFIG_VM_EVENT_COUNTERS
10/*
11 * Light weight per cpu counter implementation.
12 *
13 * Counters should only be incremented. You need to set EMBEDDED
14 * to disable VM_EVENT_COUNTERS. Things like procps (vmstat,
15 * top, etc) use /proc/vmstat and depend on these counters.
16 *
17 * Counters are handled completely inline. On many platforms the code
18 * generated will simply be the increment of a global address.
19 */
20
21#ifdef CONFIG_ZONE_DMA32
22#define DMA32_ZONE(xx) xx##_DMA32,
23#else
24#define DMA32_ZONE(xx)
25#endif
26
27#ifdef CONFIG_HIGHMEM
28#define HIGHMEM_ZONE(xx) , xx##_HIGH
29#else
30#define HIGHMEM_ZONE(xx)
31#endif
32
33#define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
34
35enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
36 FOR_ALL_ZONES(PGALLOC),
37 PGFREE, PGACTIVATE, PGDEACTIVATE,
38 PGFAULT, PGMAJFAULT,
39 FOR_ALL_ZONES(PGREFILL),
40 FOR_ALL_ZONES(PGSTEAL),
41 FOR_ALL_ZONES(PGSCAN_KSWAPD),
42 FOR_ALL_ZONES(PGSCAN_DIRECT),
43 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
44 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
45 NR_VM_EVENT_ITEMS
46};
47
48struct vm_event_state {
49 unsigned long event[NR_VM_EVENT_ITEMS];
50};
51
52DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
53
54static inline void __count_vm_event(enum vm_event_item item)
55{
56 __get_cpu_var(vm_event_states).event[item]++;
57}
58
59static inline void count_vm_event(enum vm_event_item item)
60{
61 get_cpu_var(vm_event_states).event[item]++;
62 put_cpu();
63}
64
65static inline void __count_vm_events(enum vm_event_item item, long delta)
66{
67 __get_cpu_var(vm_event_states).event[item] += delta;
68}
69
70static inline void count_vm_events(enum vm_event_item item, long delta)
71{
72 get_cpu_var(vm_event_states).event[item] += delta;
73 put_cpu();
74}
75
76extern void all_vm_events(unsigned long *);
77#ifdef CONFIG_HOTPLUG
78extern void vm_events_fold_cpu(int cpu);
79#else
80static inline void vm_events_fold_cpu(int cpu)
81{
82}
83#endif
84
85#else
86
87/* Disable counters */
88#define get_cpu_vm_events(e) 0L
89#define count_vm_event(e) do { } while (0)
90#define count_vm_events(e,d) do { } while (0)
91#define __count_vm_event(e) do { } while (0)
92#define __count_vm_events(e,d) do { } while (0)
93#define vm_events_fold_cpu(x) do { } while (0)
94
95#endif /* CONFIG_VM_EVENT_COUNTERS */
96
97#define __count_zone_vm_events(item, zone, delta) \
98 __count_vm_events(item##_DMA + zone_idx(zone), delta)
99
100/*
101 * Zone based page accounting with per cpu differentials.
102 */
103extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
104
105static inline void zone_page_state_add(long x, struct zone *zone,
106 enum zone_stat_item item)
107{
108 atomic_long_add(x, &zone->vm_stat[item]);
109 atomic_long_add(x, &vm_stat[item]);
110}
111
112static inline unsigned long global_page_state(enum zone_stat_item item)
113{
114 long x = atomic_long_read(&vm_stat[item]);
115#ifdef CONFIG_SMP
116 if (x < 0)
117 x = 0;
118#endif
119 return x;
120}
121
122static inline unsigned long zone_page_state(struct zone *zone,
123 enum zone_stat_item item)
124{
125 long x = atomic_long_read(&zone->vm_stat[item]);
126#ifdef CONFIG_SMP
127 if (x < 0)
128 x = 0;
129#endif
130 return x;
131}
132
133#ifdef CONFIG_NUMA
134/*
135 * Determine the per node value of a stat item. This function
136 * is called frequently in a NUMA machine, so try to be as
137 * frugal as possible.
138 */
139static inline unsigned long node_page_state(int node,
140 enum zone_stat_item item)
141{
142 struct zone *zones = NODE_DATA(node)->node_zones;
143
144 return
145#ifdef CONFIG_ZONE_DMA32
146 zone_page_state(&zones[ZONE_DMA32], item) +
147#endif
148 zone_page_state(&zones[ZONE_NORMAL], item) +
149#ifdef CONFIG_HIGHMEM
150 zone_page_state(&zones[ZONE_HIGHMEM], item) +
151#endif
152 zone_page_state(&zones[ZONE_DMA], item);
153}
154
155extern void zone_statistics(struct zonelist *, struct zone *);
156
157#else
158
159#define node_page_state(node, item) global_page_state(item)
160#define zone_statistics(_zl,_z) do { } while (0)
161
162#endif /* CONFIG_NUMA */
163
164#define __add_zone_page_state(__z, __i, __d) \
165 __mod_zone_page_state(__z, __i, __d)
166#define __sub_zone_page_state(__z, __i, __d) \
167 __mod_zone_page_state(__z, __i,-(__d))
168
169#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
170#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
171
172static inline void zap_zone_vm_stats(struct zone *zone)
173{
174 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
175}
176
177extern void inc_zone_state(struct zone *, enum zone_stat_item);
178
179#ifdef CONFIG_SMP
180void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
181void __inc_zone_page_state(struct page *, enum zone_stat_item);
182void __dec_zone_page_state(struct page *, enum zone_stat_item);
183
184void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
185void inc_zone_page_state(struct page *, enum zone_stat_item);
186void dec_zone_page_state(struct page *, enum zone_stat_item);
187
188extern void inc_zone_state(struct zone *, enum zone_stat_item);
189
190void refresh_cpu_vm_stats(int);
191void refresh_vm_stats(void);
192
193#else /* CONFIG_SMP */
194
195/*
196 * We do not maintain differentials in a single processor configuration.
197 * The functions directly modify the zone and global counters.
198 */
199static inline void __mod_zone_page_state(struct zone *zone,
200 enum zone_stat_item item, int delta)
201{
202 zone_page_state_add(delta, zone, item);
203}
204
205static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
206{
207 atomic_long_inc(&zone->vm_stat[item]);
208 atomic_long_inc(&vm_stat[item]);
209}
210
211static inline void __inc_zone_page_state(struct page *page,
212 enum zone_stat_item item)
213{
214 __inc_zone_state(page_zone(page), item);
215}
216
217static inline void __dec_zone_page_state(struct page *page,
218 enum zone_stat_item item)
219{
220 atomic_long_dec(&page_zone(page)->vm_stat[item]);
221 atomic_long_dec(&vm_stat[item]);
222}
223
224/*
225 * We only use atomic operations to update counters. So there is no need to
226 * disable interrupts.
227 */
228#define inc_zone_page_state __inc_zone_page_state
229#define dec_zone_page_state __dec_zone_page_state
230#define mod_zone_page_state __mod_zone_page_state
231
232static inline void refresh_cpu_vm_stats(int cpu) { }
233static inline void refresh_vm_stats(void) { }
234#endif
235
236#endif /* _LINUX_VMSTAT_H */