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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> | |
96177299 | 6 | #include <linux/mm.h> |
2244b95a | 7 | #include <linux/mmzone.h> |
f042e707 | 8 | #include <linux/vm_event_item.h> |
60063497 | 9 | #include <linux/atomic.h> |
f6ac2354 | 10 | |
c748e134 AB |
11 | extern int sysctl_stat_interval; |
12 | ||
780a0656 AM |
13 | #ifdef CONFIG_VM_EVENT_COUNTERS |
14 | /* | |
15 | * Light weight per cpu counter implementation. | |
16 | * | |
17 | * Counters should only be incremented and no critical kernel component | |
18 | * should rely on the counter values. | |
19 | * | |
20 | * Counters are handled completely inline. On many platforms the code | |
21 | * generated will simply be the increment of a global address. | |
22 | */ | |
23 | ||
f8891e5e CL |
24 | struct vm_event_state { |
25 | unsigned long event[NR_VM_EVENT_ITEMS]; | |
f6ac2354 CL |
26 | }; |
27 | ||
f8891e5e CL |
28 | DECLARE_PER_CPU(struct vm_event_state, vm_event_states); |
29 | ||
30 | static inline void __count_vm_event(enum vm_event_item item) | |
31 | { | |
dd17c8f7 | 32 | __this_cpu_inc(vm_event_states.event[item]); |
f8891e5e CL |
33 | } |
34 | ||
35 | static inline void count_vm_event(enum vm_event_item item) | |
36 | { | |
dd17c8f7 | 37 | this_cpu_inc(vm_event_states.event[item]); |
f8891e5e CL |
38 | } |
39 | ||
40 | static inline void __count_vm_events(enum vm_event_item item, long delta) | |
41 | { | |
dd17c8f7 | 42 | __this_cpu_add(vm_event_states.event[item], delta); |
f8891e5e CL |
43 | } |
44 | ||
45 | static inline void count_vm_events(enum vm_event_item item, long delta) | |
46 | { | |
dd17c8f7 | 47 | this_cpu_add(vm_event_states.event[item], delta); |
f8891e5e CL |
48 | } |
49 | ||
50 | extern void all_vm_events(unsigned long *); | |
e903387f | 51 | #ifdef CONFIG_HOTPLUG |
f8891e5e | 52 | extern void vm_events_fold_cpu(int cpu); |
e903387f MD |
53 | #else |
54 | static inline void vm_events_fold_cpu(int cpu) | |
55 | { | |
56 | } | |
57 | #endif | |
f8891e5e CL |
58 | |
59 | #else | |
60 | ||
61 | /* Disable counters */ | |
780a0656 AM |
62 | static inline void count_vm_event(enum vm_event_item item) |
63 | { | |
64 | } | |
65 | static inline void count_vm_events(enum vm_event_item item, long delta) | |
66 | { | |
67 | } | |
68 | static inline void __count_vm_event(enum vm_event_item item) | |
69 | { | |
70 | } | |
71 | static inline void __count_vm_events(enum vm_event_item item, long delta) | |
72 | { | |
73 | } | |
74 | static inline void all_vm_events(unsigned long *ret) | |
75 | { | |
76 | } | |
77 | static inline void vm_events_fold_cpu(int cpu) | |
78 | { | |
79 | } | |
f8891e5e CL |
80 | |
81 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
82 | ||
03c5a6e1 MG |
83 | #ifdef CONFIG_NUMA_BALANCING |
84 | #define count_vm_numa_event(x) count_vm_event(x) | |
85 | #define count_vm_numa_events(x, y) count_vm_events(x, y) | |
86 | #else | |
87 | #define count_vm_numa_event(x) do {} while (0) | |
88 | #define count_vm_numa_events(x, y) do {} while (0) | |
89 | #endif /* CONFIG_NUMA_BALANCING */ | |
90 | ||
f8891e5e | 91 | #define __count_zone_vm_events(item, zone, delta) \ |
4b51d669 CL |
92 | __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ |
93 | zone_idx(zone), delta) | |
f6ac2354 | 94 | |
2244b95a CL |
95 | /* |
96 | * Zone based page accounting with per cpu differentials. | |
97 | */ | |
98 | extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
99 | ||
100 | static inline void zone_page_state_add(long x, struct zone *zone, | |
101 | enum zone_stat_item item) | |
102 | { | |
103 | atomic_long_add(x, &zone->vm_stat[item]); | |
104 | atomic_long_add(x, &vm_stat[item]); | |
105 | } | |
106 | ||
107 | static inline unsigned long global_page_state(enum zone_stat_item item) | |
108 | { | |
109 | long x = atomic_long_read(&vm_stat[item]); | |
110 | #ifdef CONFIG_SMP | |
111 | if (x < 0) | |
112 | x = 0; | |
113 | #endif | |
114 | return x; | |
115 | } | |
116 | ||
117 | static inline unsigned long zone_page_state(struct zone *zone, | |
118 | enum zone_stat_item item) | |
119 | { | |
120 | long x = atomic_long_read(&zone->vm_stat[item]); | |
121 | #ifdef CONFIG_SMP | |
122 | if (x < 0) | |
123 | x = 0; | |
124 | #endif | |
125 | return x; | |
126 | } | |
127 | ||
aa454840 CL |
128 | /* |
129 | * More accurate version that also considers the currently pending | |
130 | * deltas. For that we need to loop over all cpus to find the current | |
131 | * deltas. There is no synchronization so the result cannot be | |
132 | * exactly accurate either. | |
133 | */ | |
134 | static inline unsigned long zone_page_state_snapshot(struct zone *zone, | |
135 | enum zone_stat_item item) | |
136 | { | |
137 | long x = atomic_long_read(&zone->vm_stat[item]); | |
138 | ||
139 | #ifdef CONFIG_SMP | |
140 | int cpu; | |
141 | for_each_online_cpu(cpu) | |
142 | x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; | |
143 | ||
144 | if (x < 0) | |
145 | x = 0; | |
146 | #endif | |
147 | return x; | |
148 | } | |
149 | ||
adea02a1 WF |
150 | extern unsigned long global_reclaimable_pages(void); |
151 | extern unsigned long zone_reclaimable_pages(struct zone *zone); | |
4f98a2fe | 152 | |
2244b95a CL |
153 | #ifdef CONFIG_NUMA |
154 | /* | |
155 | * Determine the per node value of a stat item. This function | |
156 | * is called frequently in a NUMA machine, so try to be as | |
157 | * frugal as possible. | |
158 | */ | |
159 | static inline unsigned long node_page_state(int node, | |
160 | enum zone_stat_item item) | |
161 | { | |
162 | struct zone *zones = NODE_DATA(node)->node_zones; | |
163 | ||
164 | return | |
4b51d669 CL |
165 | #ifdef CONFIG_ZONE_DMA |
166 | zone_page_state(&zones[ZONE_DMA], item) + | |
167 | #endif | |
fb0e7942 | 168 | #ifdef CONFIG_ZONE_DMA32 |
2244b95a CL |
169 | zone_page_state(&zones[ZONE_DMA32], item) + |
170 | #endif | |
2244b95a CL |
171 | #ifdef CONFIG_HIGHMEM |
172 | zone_page_state(&zones[ZONE_HIGHMEM], item) + | |
173 | #endif | |
2a1e274a MG |
174 | zone_page_state(&zones[ZONE_NORMAL], item) + |
175 | zone_page_state(&zones[ZONE_MOVABLE], item); | |
2244b95a | 176 | } |
ca889e6c | 177 | |
78afd561 | 178 | extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); |
ca889e6c | 179 | |
2244b95a | 180 | #else |
ca889e6c | 181 | |
2244b95a | 182 | #define node_page_state(node, item) global_page_state(item) |
78afd561 | 183 | #define zone_statistics(_zl, _z, gfp) do { } while (0) |
ca889e6c CL |
184 | |
185 | #endif /* CONFIG_NUMA */ | |
2244b95a | 186 | |
2244b95a CL |
187 | #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) |
188 | #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) | |
189 | ||
ca889e6c CL |
190 | extern void inc_zone_state(struct zone *, enum zone_stat_item); |
191 | ||
2244b95a CL |
192 | #ifdef CONFIG_SMP |
193 | void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); | |
194 | void __inc_zone_page_state(struct page *, enum zone_stat_item); | |
195 | void __dec_zone_page_state(struct page *, enum zone_stat_item); | |
f6ac2354 | 196 | |
2244b95a CL |
197 | void mod_zone_page_state(struct zone *, enum zone_stat_item, int); |
198 | void inc_zone_page_state(struct page *, enum zone_stat_item); | |
199 | void dec_zone_page_state(struct page *, enum zone_stat_item); | |
200 | ||
201 | extern void inc_zone_state(struct zone *, enum zone_stat_item); | |
c8785385 CL |
202 | extern void __inc_zone_state(struct zone *, enum zone_stat_item); |
203 | extern void dec_zone_state(struct zone *, enum zone_stat_item); | |
204 | extern void __dec_zone_state(struct zone *, enum zone_stat_item); | |
2244b95a CL |
205 | |
206 | void refresh_cpu_vm_stats(int); | |
a6cccdc3 | 207 | void refresh_zone_stat_thresholds(void); |
b44129b3 | 208 | |
5a883813 MK |
209 | void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); |
210 | ||
b44129b3 MG |
211 | int calculate_pressure_threshold(struct zone *zone); |
212 | int calculate_normal_threshold(struct zone *zone); | |
213 | void set_pgdat_percpu_threshold(pg_data_t *pgdat, | |
214 | int (*calculate_pressure)(struct zone *)); | |
2244b95a CL |
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 | */ | |
221 | static 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 | ||
7f4599e9 CL |
227 | static 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 | ||
2244b95a CL |
233 | static inline void __inc_zone_page_state(struct page *page, |
234 | enum zone_stat_item item) | |
235 | { | |
7f4599e9 | 236 | __inc_zone_state(page_zone(page), item); |
2244b95a CL |
237 | } |
238 | ||
c8785385 CL |
239 | static 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 | ||
2244b95a CL |
245 | static inline void __dec_zone_page_state(struct page *page, |
246 | enum zone_stat_item item) | |
247 | { | |
57ce36fe | 248 | __dec_zone_state(page_zone(page), item); |
2244b95a CL |
249 | } |
250 | ||
251 | /* | |
252 | * We only use atomic operations to update counters. So there is no need to | |
253 | * disable interrupts. | |
254 | */ | |
255 | #define inc_zone_page_state __inc_zone_page_state | |
256 | #define dec_zone_page_state __dec_zone_page_state | |
257 | #define mod_zone_page_state __mod_zone_page_state | |
258 | ||
b44129b3 | 259 | #define set_pgdat_percpu_threshold(pgdat, callback) { } |
88f5acf8 | 260 | |
2244b95a | 261 | static inline void refresh_cpu_vm_stats(int cpu) { } |
a6cccdc3 KM |
262 | static inline void refresh_zone_stat_thresholds(void) { } |
263 | ||
5a883813 MK |
264 | static inline void drain_zonestat(struct zone *zone, |
265 | struct per_cpu_pageset *pset) { } | |
fa25c503 KM |
266 | #endif /* CONFIG_SMP */ |
267 | ||
d1ce749a BZ |
268 | static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, |
269 | int migratetype) | |
270 | { | |
271 | __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); | |
272 | if (is_migrate_cma(migratetype)) | |
273 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); | |
274 | } | |
275 | ||
fa25c503 | 276 | extern const char * const vmstat_text[]; |
2244b95a CL |
277 | |
278 | #endif /* _LINUX_VMSTAT_H */ |