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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 | ||
83 | #define __count_zone_vm_events(item, zone, delta) \ | |
4b51d669 CL |
84 | __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ |
85 | zone_idx(zone), delta) | |
f6ac2354 | 86 | |
2244b95a CL |
87 | /* |
88 | * Zone based page accounting with per cpu differentials. | |
89 | */ | |
90 | extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
91 | ||
92 | static inline void zone_page_state_add(long x, struct zone *zone, | |
93 | enum zone_stat_item item) | |
94 | { | |
95 | atomic_long_add(x, &zone->vm_stat[item]); | |
96 | atomic_long_add(x, &vm_stat[item]); | |
97 | } | |
98 | ||
99 | static inline unsigned long global_page_state(enum zone_stat_item item) | |
100 | { | |
101 | long x = atomic_long_read(&vm_stat[item]); | |
102 | #ifdef CONFIG_SMP | |
103 | if (x < 0) | |
104 | x = 0; | |
105 | #endif | |
106 | return x; | |
107 | } | |
108 | ||
109 | static inline unsigned long zone_page_state(struct zone *zone, | |
110 | enum zone_stat_item item) | |
111 | { | |
112 | long x = atomic_long_read(&zone->vm_stat[item]); | |
113 | #ifdef CONFIG_SMP | |
114 | if (x < 0) | |
115 | x = 0; | |
116 | #endif | |
117 | return x; | |
118 | } | |
119 | ||
aa454840 CL |
120 | /* |
121 | * More accurate version that also considers the currently pending | |
122 | * deltas. For that we need to loop over all cpus to find the current | |
123 | * deltas. There is no synchronization so the result cannot be | |
124 | * exactly accurate either. | |
125 | */ | |
126 | static inline unsigned long zone_page_state_snapshot(struct zone *zone, | |
127 | enum zone_stat_item item) | |
128 | { | |
129 | long x = atomic_long_read(&zone->vm_stat[item]); | |
130 | ||
131 | #ifdef CONFIG_SMP | |
132 | int cpu; | |
133 | for_each_online_cpu(cpu) | |
134 | x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; | |
135 | ||
136 | if (x < 0) | |
137 | x = 0; | |
138 | #endif | |
139 | return x; | |
140 | } | |
141 | ||
adea02a1 WF |
142 | extern unsigned long global_reclaimable_pages(void); |
143 | extern unsigned long zone_reclaimable_pages(struct zone *zone); | |
4f98a2fe | 144 | |
2244b95a CL |
145 | #ifdef CONFIG_NUMA |
146 | /* | |
147 | * Determine the per node value of a stat item. This function | |
148 | * is called frequently in a NUMA machine, so try to be as | |
149 | * frugal as possible. | |
150 | */ | |
151 | static inline unsigned long node_page_state(int node, | |
152 | enum zone_stat_item item) | |
153 | { | |
154 | struct zone *zones = NODE_DATA(node)->node_zones; | |
155 | ||
156 | return | |
4b51d669 CL |
157 | #ifdef CONFIG_ZONE_DMA |
158 | zone_page_state(&zones[ZONE_DMA], item) + | |
159 | #endif | |
fb0e7942 | 160 | #ifdef CONFIG_ZONE_DMA32 |
2244b95a CL |
161 | zone_page_state(&zones[ZONE_DMA32], item) + |
162 | #endif | |
2244b95a CL |
163 | #ifdef CONFIG_HIGHMEM |
164 | zone_page_state(&zones[ZONE_HIGHMEM], item) + | |
165 | #endif | |
2a1e274a MG |
166 | zone_page_state(&zones[ZONE_NORMAL], item) + |
167 | zone_page_state(&zones[ZONE_MOVABLE], item); | |
2244b95a | 168 | } |
ca889e6c | 169 | |
78afd561 | 170 | extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); |
ca889e6c | 171 | |
2244b95a | 172 | #else |
ca889e6c | 173 | |
2244b95a | 174 | #define node_page_state(node, item) global_page_state(item) |
78afd561 | 175 | #define zone_statistics(_zl, _z, gfp) do { } while (0) |
ca889e6c CL |
176 | |
177 | #endif /* CONFIG_NUMA */ | |
2244b95a | 178 | |
2244b95a CL |
179 | #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) |
180 | #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) | |
181 | ||
ca889e6c CL |
182 | extern void inc_zone_state(struct zone *, enum zone_stat_item); |
183 | ||
2244b95a CL |
184 | #ifdef CONFIG_SMP |
185 | void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); | |
186 | void __inc_zone_page_state(struct page *, enum zone_stat_item); | |
187 | void __dec_zone_page_state(struct page *, enum zone_stat_item); | |
f6ac2354 | 188 | |
2244b95a CL |
189 | void mod_zone_page_state(struct zone *, enum zone_stat_item, int); |
190 | void inc_zone_page_state(struct page *, enum zone_stat_item); | |
191 | void dec_zone_page_state(struct page *, enum zone_stat_item); | |
192 | ||
193 | extern void inc_zone_state(struct zone *, enum zone_stat_item); | |
c8785385 CL |
194 | extern void __inc_zone_state(struct zone *, enum zone_stat_item); |
195 | extern void dec_zone_state(struct zone *, enum zone_stat_item); | |
196 | extern void __dec_zone_state(struct zone *, enum zone_stat_item); | |
2244b95a CL |
197 | |
198 | void refresh_cpu_vm_stats(int); | |
a6cccdc3 | 199 | void refresh_zone_stat_thresholds(void); |
b44129b3 | 200 | |
5a883813 MK |
201 | void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); |
202 | ||
b44129b3 MG |
203 | int calculate_pressure_threshold(struct zone *zone); |
204 | int calculate_normal_threshold(struct zone *zone); | |
205 | void set_pgdat_percpu_threshold(pg_data_t *pgdat, | |
206 | int (*calculate_pressure)(struct zone *)); | |
2244b95a CL |
207 | #else /* CONFIG_SMP */ |
208 | ||
209 | /* | |
210 | * We do not maintain differentials in a single processor configuration. | |
211 | * The functions directly modify the zone and global counters. | |
212 | */ | |
213 | static inline void __mod_zone_page_state(struct zone *zone, | |
214 | enum zone_stat_item item, int delta) | |
215 | { | |
216 | zone_page_state_add(delta, zone, item); | |
217 | } | |
218 | ||
7f4599e9 CL |
219 | static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
220 | { | |
221 | atomic_long_inc(&zone->vm_stat[item]); | |
222 | atomic_long_inc(&vm_stat[item]); | |
223 | } | |
224 | ||
2244b95a CL |
225 | static inline void __inc_zone_page_state(struct page *page, |
226 | enum zone_stat_item item) | |
227 | { | |
7f4599e9 | 228 | __inc_zone_state(page_zone(page), item); |
2244b95a CL |
229 | } |
230 | ||
c8785385 CL |
231 | static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
232 | { | |
233 | atomic_long_dec(&zone->vm_stat[item]); | |
234 | atomic_long_dec(&vm_stat[item]); | |
235 | } | |
236 | ||
2244b95a CL |
237 | static inline void __dec_zone_page_state(struct page *page, |
238 | enum zone_stat_item item) | |
239 | { | |
57ce36fe | 240 | __dec_zone_state(page_zone(page), item); |
2244b95a CL |
241 | } |
242 | ||
243 | /* | |
244 | * We only use atomic operations to update counters. So there is no need to | |
245 | * disable interrupts. | |
246 | */ | |
247 | #define inc_zone_page_state __inc_zone_page_state | |
248 | #define dec_zone_page_state __dec_zone_page_state | |
249 | #define mod_zone_page_state __mod_zone_page_state | |
250 | ||
b44129b3 | 251 | #define set_pgdat_percpu_threshold(pgdat, callback) { } |
88f5acf8 | 252 | |
2244b95a | 253 | static inline void refresh_cpu_vm_stats(int cpu) { } |
a6cccdc3 KM |
254 | static inline void refresh_zone_stat_thresholds(void) { } |
255 | ||
5a883813 MK |
256 | static inline void drain_zonestat(struct zone *zone, |
257 | struct per_cpu_pageset *pset) { } | |
fa25c503 KM |
258 | #endif /* CONFIG_SMP */ |
259 | ||
d1ce749a BZ |
260 | static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, |
261 | int migratetype) | |
262 | { | |
263 | __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); | |
264 | if (is_migrate_cma(migratetype)) | |
265 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); | |
266 | } | |
267 | ||
fa25c503 | 268 | extern const char * const vmstat_text[]; |
2244b95a CL |
269 | |
270 | #endif /* _LINUX_VMSTAT_H */ |