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1 | #ifndef _LINUX_VMSTAT_H |
2 | #define _LINUX_VMSTAT_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/percpu.h> | |
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6 | #include <linux/config.h> |
7 | #include <linux/mmzone.h> | |
8 | #include <asm/atomic.h> | |
f6ac2354 | 9 | |
f8891e5e | 10 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 | 11 | /* |
f8891e5e | 12 | * Light weight per cpu counter implementation. |
f6ac2354 | 13 | * |
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14 | * Counters should only be incremented and no critical kernel component |
15 | * should rely on the counter values. | |
16 | * | |
17 | * Counters are handled completely inline. On many platforms the code | |
18 | * generated will simply be the increment of a global address. | |
f6ac2354 | 19 | */ |
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20 | |
21 | #define FOR_ALL_ZONES(x) x##_DMA, x##_DMA32, x##_NORMAL, x##_HIGH | |
22 | ||
23 | enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, | |
24 | FOR_ALL_ZONES(PGALLOC), | |
25 | PGFREE, PGACTIVATE, PGDEACTIVATE, | |
26 | PGFAULT, PGMAJFAULT, | |
27 | FOR_ALL_ZONES(PGREFILL), | |
28 | FOR_ALL_ZONES(PGSTEAL), | |
29 | FOR_ALL_ZONES(PGSCAN_KSWAPD), | |
30 | FOR_ALL_ZONES(PGSCAN_DIRECT), | |
31 | PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL, | |
32 | PAGEOUTRUN, ALLOCSTALL, PGROTATED, | |
33 | NR_VM_EVENT_ITEMS | |
34 | }; | |
35 | ||
36 | struct vm_event_state { | |
37 | unsigned long event[NR_VM_EVENT_ITEMS]; | |
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38 | }; |
39 | ||
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40 | DECLARE_PER_CPU(struct vm_event_state, vm_event_states); |
41 | ||
42 | static inline void __count_vm_event(enum vm_event_item item) | |
43 | { | |
44 | __get_cpu_var(vm_event_states.event[item])++; | |
45 | } | |
46 | ||
47 | static inline void count_vm_event(enum vm_event_item item) | |
48 | { | |
49 | get_cpu_var(vm_event_states.event[item])++; | |
50 | put_cpu(); | |
51 | } | |
52 | ||
53 | static inline void __count_vm_events(enum vm_event_item item, long delta) | |
54 | { | |
55 | __get_cpu_var(vm_event_states.event[item]) += delta; | |
56 | } | |
57 | ||
58 | static inline void count_vm_events(enum vm_event_item item, long delta) | |
59 | { | |
e45b3b6a | 60 | get_cpu_var(vm_event_states.event[item]) += delta; |
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61 | put_cpu(); |
62 | } | |
63 | ||
64 | extern void all_vm_events(unsigned long *); | |
65 | extern void vm_events_fold_cpu(int cpu); | |
66 | ||
67 | #else | |
68 | ||
69 | /* Disable counters */ | |
70 | #define get_cpu_vm_events(e) 0L | |
71 | #define count_vm_event(e) do { } while (0) | |
72 | #define count_vm_events(e,d) do { } while (0) | |
73 | #define __count_vm_event(e) do { } while (0) | |
74 | #define __count_vm_events(e,d) do { } while (0) | |
75 | #define vm_events_fold_cpu(x) do { } while (0) | |
76 | ||
77 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
78 | ||
79 | #define __count_zone_vm_events(item, zone, delta) \ | |
80 | __count_vm_events(item##_DMA + zone_idx(zone), delta) | |
f6ac2354 | 81 | |
2244b95a CL |
82 | /* |
83 | * Zone based page accounting with per cpu differentials. | |
84 | */ | |
85 | extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
86 | ||
87 | static inline void zone_page_state_add(long x, struct zone *zone, | |
88 | enum zone_stat_item item) | |
89 | { | |
90 | atomic_long_add(x, &zone->vm_stat[item]); | |
91 | atomic_long_add(x, &vm_stat[item]); | |
92 | } | |
93 | ||
94 | static inline unsigned long global_page_state(enum zone_stat_item item) | |
95 | { | |
96 | long x = atomic_long_read(&vm_stat[item]); | |
97 | #ifdef CONFIG_SMP | |
98 | if (x < 0) | |
99 | x = 0; | |
100 | #endif | |
101 | return x; | |
102 | } | |
103 | ||
104 | static inline unsigned long zone_page_state(struct zone *zone, | |
105 | enum zone_stat_item item) | |
106 | { | |
107 | long x = atomic_long_read(&zone->vm_stat[item]); | |
108 | #ifdef CONFIG_SMP | |
109 | if (x < 0) | |
110 | x = 0; | |
111 | #endif | |
112 | return x; | |
113 | } | |
114 | ||
115 | #ifdef CONFIG_NUMA | |
116 | /* | |
117 | * Determine the per node value of a stat item. This function | |
118 | * is called frequently in a NUMA machine, so try to be as | |
119 | * frugal as possible. | |
120 | */ | |
121 | static inline unsigned long node_page_state(int node, | |
122 | enum zone_stat_item item) | |
123 | { | |
124 | struct zone *zones = NODE_DATA(node)->node_zones; | |
125 | ||
126 | return | |
127 | #ifndef CONFIG_DMA_IS_NORMAL | |
128 | #if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64 | |
129 | zone_page_state(&zones[ZONE_DMA32], item) + | |
130 | #endif | |
131 | zone_page_state(&zones[ZONE_NORMAL], item) + | |
132 | #endif | |
133 | #ifdef CONFIG_HIGHMEM | |
134 | zone_page_state(&zones[ZONE_HIGHMEM], item) + | |
135 | #endif | |
136 | zone_page_state(&zones[ZONE_DMA], item); | |
137 | } | |
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138 | |
139 | extern void zone_statistics(struct zonelist *, struct zone *); | |
140 | ||
2244b95a | 141 | #else |
ca889e6c | 142 | |
2244b95a | 143 | #define node_page_state(node, item) global_page_state(item) |
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144 | #define zone_statistics(_zl,_z) do { } while (0) |
145 | ||
146 | #endif /* CONFIG_NUMA */ | |
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147 | |
148 | #define __add_zone_page_state(__z, __i, __d) \ | |
149 | __mod_zone_page_state(__z, __i, __d) | |
150 | #define __sub_zone_page_state(__z, __i, __d) \ | |
151 | __mod_zone_page_state(__z, __i,-(__d)) | |
152 | ||
153 | #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) | |
154 | #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) | |
155 | ||
156 | static inline void zap_zone_vm_stats(struct zone *zone) | |
157 | { | |
158 | memset(zone->vm_stat, 0, sizeof(zone->vm_stat)); | |
159 | } | |
160 | ||
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161 | extern void inc_zone_state(struct zone *, enum zone_stat_item); |
162 | ||
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163 | #ifdef CONFIG_SMP |
164 | void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); | |
165 | void __inc_zone_page_state(struct page *, enum zone_stat_item); | |
166 | void __dec_zone_page_state(struct page *, enum zone_stat_item); | |
f6ac2354 | 167 | |
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168 | void mod_zone_page_state(struct zone *, enum zone_stat_item, int); |
169 | void inc_zone_page_state(struct page *, enum zone_stat_item); | |
170 | void dec_zone_page_state(struct page *, enum zone_stat_item); | |
171 | ||
172 | extern void inc_zone_state(struct zone *, enum zone_stat_item); | |
173 | ||
174 | void refresh_cpu_vm_stats(int); | |
175 | void refresh_vm_stats(void); | |
176 | ||
177 | #else /* CONFIG_SMP */ | |
178 | ||
179 | /* | |
180 | * We do not maintain differentials in a single processor configuration. | |
181 | * The functions directly modify the zone and global counters. | |
182 | */ | |
183 | static inline void __mod_zone_page_state(struct zone *zone, | |
184 | enum zone_stat_item item, int delta) | |
185 | { | |
186 | zone_page_state_add(delta, zone, item); | |
187 | } | |
188 | ||
189 | static inline void __inc_zone_page_state(struct page *page, | |
190 | enum zone_stat_item item) | |
191 | { | |
192 | atomic_long_inc(&page_zone(page)->vm_stat[item]); | |
193 | atomic_long_inc(&vm_stat[item]); | |
194 | } | |
195 | ||
196 | static inline void __dec_zone_page_state(struct page *page, | |
197 | enum zone_stat_item item) | |
198 | { | |
199 | atomic_long_dec(&page_zone(page)->vm_stat[item]); | |
200 | atomic_long_dec(&vm_stat[item]); | |
201 | } | |
202 | ||
203 | /* | |
204 | * We only use atomic operations to update counters. So there is no need to | |
205 | * disable interrupts. | |
206 | */ | |
207 | #define inc_zone_page_state __inc_zone_page_state | |
208 | #define dec_zone_page_state __dec_zone_page_state | |
209 | #define mod_zone_page_state __mod_zone_page_state | |
210 | ||
211 | static inline void refresh_cpu_vm_stats(int cpu) { } | |
212 | static inline void refresh_vm_stats(void) { } | |
213 | #endif | |
214 | ||
215 | #endif /* _LINUX_VMSTAT_H */ |