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f6ac2354 CL |
1 | #ifndef _LINUX_VMSTAT_H |
2 | #define _LINUX_VMSTAT_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/percpu.h> | |
2244b95a CL |
6 | #include <linux/mmzone.h> |
7 | #include <asm/atomic.h> | |
f6ac2354 | 8 | |
f8891e5e | 9 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 | 10 | /* |
f8891e5e | 11 | * Light weight per cpu counter implementation. |
f6ac2354 | 12 | * |
f8891e5e CL |
13 | * Counters should only be incremented and no critical kernel component |
14 | * should rely on the counter values. | |
15 | * | |
16 | * Counters are handled completely inline. On many platforms the code | |
17 | * generated will simply be the increment of a global address. | |
f6ac2354 | 18 | */ |
f8891e5e | 19 | |
27bf71c2 CL |
20 | #ifdef CONFIG_ZONE_DMA32 |
21 | #define DMA32_ZONE(xx) xx##_DMA32, | |
22 | #else | |
23 | #define DMA32_ZONE(xx) | |
24 | #endif | |
25 | ||
26 | #ifdef CONFIG_HIGHMEM | |
27 | #define HIGHMEM_ZONE(xx) , xx##_HIGH | |
28 | #else | |
29 | #define HIGHMEM_ZONE(xx) | |
30 | #endif | |
31 | ||
32 | #define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) | |
f8891e5e CL |
33 | |
34 | enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, | |
35 | FOR_ALL_ZONES(PGALLOC), | |
36 | PGFREE, PGACTIVATE, PGDEACTIVATE, | |
37 | PGFAULT, PGMAJFAULT, | |
38 | FOR_ALL_ZONES(PGREFILL), | |
39 | FOR_ALL_ZONES(PGSTEAL), | |
40 | FOR_ALL_ZONES(PGSCAN_KSWAPD), | |
41 | FOR_ALL_ZONES(PGSCAN_DIRECT), | |
42 | PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL, | |
43 | PAGEOUTRUN, ALLOCSTALL, PGROTATED, | |
44 | NR_VM_EVENT_ITEMS | |
45 | }; | |
46 | ||
47 | struct vm_event_state { | |
48 | unsigned long event[NR_VM_EVENT_ITEMS]; | |
f6ac2354 CL |
49 | }; |
50 | ||
f8891e5e CL |
51 | DECLARE_PER_CPU(struct vm_event_state, vm_event_states); |
52 | ||
53 | static inline void __count_vm_event(enum vm_event_item item) | |
54 | { | |
38cbcdc0 | 55 | __get_cpu_var(vm_event_states).event[item]++; |
f8891e5e CL |
56 | } |
57 | ||
58 | static inline void count_vm_event(enum vm_event_item item) | |
59 | { | |
38cbcdc0 | 60 | get_cpu_var(vm_event_states).event[item]++; |
f8891e5e CL |
61 | put_cpu(); |
62 | } | |
63 | ||
64 | static inline void __count_vm_events(enum vm_event_item item, long delta) | |
65 | { | |
38cbcdc0 | 66 | __get_cpu_var(vm_event_states).event[item] += delta; |
f8891e5e CL |
67 | } |
68 | ||
69 | static inline void count_vm_events(enum vm_event_item item, long delta) | |
70 | { | |
38cbcdc0 | 71 | get_cpu_var(vm_event_states).event[item] += delta; |
f8891e5e CL |
72 | put_cpu(); |
73 | } | |
74 | ||
75 | extern void all_vm_events(unsigned long *); | |
76 | extern void vm_events_fold_cpu(int cpu); | |
77 | ||
78 | #else | |
79 | ||
80 | /* Disable counters */ | |
81 | #define get_cpu_vm_events(e) 0L | |
82 | #define count_vm_event(e) do { } while (0) | |
83 | #define count_vm_events(e,d) do { } while (0) | |
84 | #define __count_vm_event(e) do { } while (0) | |
85 | #define __count_vm_events(e,d) do { } while (0) | |
86 | #define vm_events_fold_cpu(x) do { } while (0) | |
87 | ||
88 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
89 | ||
90 | #define __count_zone_vm_events(item, zone, delta) \ | |
91 | __count_vm_events(item##_DMA + zone_idx(zone), delta) | |
f6ac2354 | 92 | |
2244b95a CL |
93 | /* |
94 | * Zone based page accounting with per cpu differentials. | |
95 | */ | |
96 | extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
97 | ||
98 | static inline void zone_page_state_add(long x, struct zone *zone, | |
99 | enum zone_stat_item item) | |
100 | { | |
101 | atomic_long_add(x, &zone->vm_stat[item]); | |
102 | atomic_long_add(x, &vm_stat[item]); | |
103 | } | |
104 | ||
105 | static inline unsigned long global_page_state(enum zone_stat_item item) | |
106 | { | |
107 | long x = atomic_long_read(&vm_stat[item]); | |
108 | #ifdef CONFIG_SMP | |
109 | if (x < 0) | |
110 | x = 0; | |
111 | #endif | |
112 | return x; | |
113 | } | |
114 | ||
115 | static inline unsigned long zone_page_state(struct zone *zone, | |
116 | enum zone_stat_item item) | |
117 | { | |
118 | long x = atomic_long_read(&zone->vm_stat[item]); | |
119 | #ifdef CONFIG_SMP | |
120 | if (x < 0) | |
121 | x = 0; | |
122 | #endif | |
123 | return x; | |
124 | } | |
125 | ||
126 | #ifdef CONFIG_NUMA | |
127 | /* | |
128 | * Determine the per node value of a stat item. This function | |
129 | * is called frequently in a NUMA machine, so try to be as | |
130 | * frugal as possible. | |
131 | */ | |
132 | static inline unsigned long node_page_state(int node, | |
133 | enum zone_stat_item item) | |
134 | { | |
135 | struct zone *zones = NODE_DATA(node)->node_zones; | |
136 | ||
137 | return | |
fb0e7942 | 138 | #ifdef CONFIG_ZONE_DMA32 |
2244b95a CL |
139 | zone_page_state(&zones[ZONE_DMA32], item) + |
140 | #endif | |
141 | zone_page_state(&zones[ZONE_NORMAL], item) + | |
2244b95a CL |
142 | #ifdef CONFIG_HIGHMEM |
143 | zone_page_state(&zones[ZONE_HIGHMEM], item) + | |
144 | #endif | |
145 | zone_page_state(&zones[ZONE_DMA], item); | |
146 | } | |
ca889e6c CL |
147 | |
148 | extern void zone_statistics(struct zonelist *, struct zone *); | |
149 | ||
2244b95a | 150 | #else |
ca889e6c | 151 | |
2244b95a | 152 | #define node_page_state(node, item) global_page_state(item) |
ca889e6c CL |
153 | #define zone_statistics(_zl,_z) do { } while (0) |
154 | ||
155 | #endif /* CONFIG_NUMA */ | |
2244b95a CL |
156 | |
157 | #define __add_zone_page_state(__z, __i, __d) \ | |
158 | __mod_zone_page_state(__z, __i, __d) | |
159 | #define __sub_zone_page_state(__z, __i, __d) \ | |
160 | __mod_zone_page_state(__z, __i,-(__d)) | |
161 | ||
162 | #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) | |
163 | #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) | |
164 | ||
165 | static inline void zap_zone_vm_stats(struct zone *zone) | |
166 | { | |
167 | memset(zone->vm_stat, 0, sizeof(zone->vm_stat)); | |
168 | } | |
169 | ||
ca889e6c CL |
170 | extern void inc_zone_state(struct zone *, enum zone_stat_item); |
171 | ||
2244b95a CL |
172 | #ifdef CONFIG_SMP |
173 | void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); | |
174 | void __inc_zone_page_state(struct page *, enum zone_stat_item); | |
175 | void __dec_zone_page_state(struct page *, enum zone_stat_item); | |
f6ac2354 | 176 | |
2244b95a CL |
177 | void mod_zone_page_state(struct zone *, enum zone_stat_item, int); |
178 | void inc_zone_page_state(struct page *, enum zone_stat_item); | |
179 | void dec_zone_page_state(struct page *, enum zone_stat_item); | |
180 | ||
181 | extern void inc_zone_state(struct zone *, enum zone_stat_item); | |
182 | ||
183 | void refresh_cpu_vm_stats(int); | |
184 | void refresh_vm_stats(void); | |
185 | ||
186 | #else /* CONFIG_SMP */ | |
187 | ||
188 | /* | |
189 | * We do not maintain differentials in a single processor configuration. | |
190 | * The functions directly modify the zone and global counters. | |
191 | */ | |
192 | static inline void __mod_zone_page_state(struct zone *zone, | |
193 | enum zone_stat_item item, int delta) | |
194 | { | |
195 | zone_page_state_add(delta, zone, item); | |
196 | } | |
197 | ||
7f4599e9 CL |
198 | static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
199 | { | |
200 | atomic_long_inc(&zone->vm_stat[item]); | |
201 | atomic_long_inc(&vm_stat[item]); | |
202 | } | |
203 | ||
2244b95a CL |
204 | static inline void __inc_zone_page_state(struct page *page, |
205 | enum zone_stat_item item) | |
206 | { | |
7f4599e9 | 207 | __inc_zone_state(page_zone(page), item); |
2244b95a CL |
208 | } |
209 | ||
210 | static inline void __dec_zone_page_state(struct page *page, | |
211 | enum zone_stat_item item) | |
212 | { | |
213 | atomic_long_dec(&page_zone(page)->vm_stat[item]); | |
214 | atomic_long_dec(&vm_stat[item]); | |
215 | } | |
216 | ||
217 | /* | |
218 | * We only use atomic operations to update counters. So there is no need to | |
219 | * disable interrupts. | |
220 | */ | |
221 | #define inc_zone_page_state __inc_zone_page_state | |
222 | #define dec_zone_page_state __dec_zone_page_state | |
223 | #define mod_zone_page_state __mod_zone_page_state | |
224 | ||
225 | static inline void refresh_cpu_vm_stats(int cpu) { } | |
226 | static inline void refresh_vm_stats(void) { } | |
227 | #endif | |
228 | ||
229 | #endif /* _LINUX_VMSTAT_H */ |