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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 | ||
293b6a4c CL |
30 | /* |
31 | * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the | |
32 | * local_irq_disable overhead. | |
33 | */ | |
f8891e5e CL |
34 | static inline void __count_vm_event(enum vm_event_item item) |
35 | { | |
293b6a4c | 36 | raw_cpu_inc(vm_event_states.event[item]); |
f8891e5e CL |
37 | } |
38 | ||
39 | static inline void count_vm_event(enum vm_event_item item) | |
40 | { | |
dd17c8f7 | 41 | this_cpu_inc(vm_event_states.event[item]); |
f8891e5e CL |
42 | } |
43 | ||
44 | static inline void __count_vm_events(enum vm_event_item item, long delta) | |
45 | { | |
293b6a4c | 46 | raw_cpu_add(vm_event_states.event[item], delta); |
f8891e5e CL |
47 | } |
48 | ||
49 | static inline void count_vm_events(enum vm_event_item item, long delta) | |
50 | { | |
dd17c8f7 | 51 | this_cpu_add(vm_event_states.event[item], delta); |
f8891e5e CL |
52 | } |
53 | ||
54 | extern void all_vm_events(unsigned long *); | |
f1cb0879 | 55 | |
f8891e5e CL |
56 | extern void vm_events_fold_cpu(int cpu); |
57 | ||
58 | #else | |
59 | ||
60 | /* Disable counters */ | |
780a0656 AM |
61 | static inline void count_vm_event(enum vm_event_item item) |
62 | { | |
63 | } | |
64 | static inline void count_vm_events(enum vm_event_item item, long delta) | |
65 | { | |
66 | } | |
67 | static inline void __count_vm_event(enum vm_event_item item) | |
68 | { | |
69 | } | |
70 | static inline void __count_vm_events(enum vm_event_item item, long delta) | |
71 | { | |
72 | } | |
73 | static inline void all_vm_events(unsigned long *ret) | |
74 | { | |
75 | } | |
76 | static inline void vm_events_fold_cpu(int cpu) | |
77 | { | |
78 | } | |
f8891e5e CL |
79 | |
80 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
81 | ||
03c5a6e1 MG |
82 | #ifdef CONFIG_NUMA_BALANCING |
83 | #define count_vm_numa_event(x) count_vm_event(x) | |
84 | #define count_vm_numa_events(x, y) count_vm_events(x, y) | |
85 | #else | |
86 | #define count_vm_numa_event(x) do {} while (0) | |
3c0ff468 | 87 | #define count_vm_numa_events(x, y) do { (void)(y); } while (0) |
03c5a6e1 MG |
88 | #endif /* CONFIG_NUMA_BALANCING */ |
89 | ||
ec659934 MG |
90 | #ifdef CONFIG_DEBUG_TLBFLUSH |
91 | #define count_vm_tlb_event(x) count_vm_event(x) | |
92 | #define count_vm_tlb_events(x, y) count_vm_events(x, y) | |
93 | #else | |
94 | #define count_vm_tlb_event(x) do {} while (0) | |
95 | #define count_vm_tlb_events(x, y) do { (void)(y); } while (0) | |
96 | #endif | |
97 | ||
4f115147 DB |
98 | #ifdef CONFIG_DEBUG_VM_VMACACHE |
99 | #define count_vm_vmacache_event(x) count_vm_event(x) | |
100 | #else | |
101 | #define count_vm_vmacache_event(x) do {} while (0) | |
102 | #endif | |
103 | ||
f8891e5e | 104 | #define __count_zone_vm_events(item, zone, delta) \ |
4b51d669 CL |
105 | __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ |
106 | zone_idx(zone), delta) | |
f6ac2354 | 107 | |
2244b95a CL |
108 | /* |
109 | * Zone based page accounting with per cpu differentials. | |
110 | */ | |
111 | extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
112 | ||
113 | static inline void zone_page_state_add(long x, struct zone *zone, | |
114 | enum zone_stat_item item) | |
115 | { | |
116 | atomic_long_add(x, &zone->vm_stat[item]); | |
117 | atomic_long_add(x, &vm_stat[item]); | |
118 | } | |
119 | ||
120 | static inline unsigned long global_page_state(enum zone_stat_item item) | |
121 | { | |
122 | long x = atomic_long_read(&vm_stat[item]); | |
123 | #ifdef CONFIG_SMP | |
124 | if (x < 0) | |
125 | x = 0; | |
126 | #endif | |
127 | return x; | |
128 | } | |
129 | ||
130 | static inline unsigned long zone_page_state(struct zone *zone, | |
131 | enum zone_stat_item item) | |
132 | { | |
133 | long x = atomic_long_read(&zone->vm_stat[item]); | |
134 | #ifdef CONFIG_SMP | |
135 | if (x < 0) | |
136 | x = 0; | |
137 | #endif | |
138 | return x; | |
139 | } | |
140 | ||
aa454840 CL |
141 | /* |
142 | * More accurate version that also considers the currently pending | |
143 | * deltas. For that we need to loop over all cpus to find the current | |
144 | * deltas. There is no synchronization so the result cannot be | |
145 | * exactly accurate either. | |
146 | */ | |
147 | static inline unsigned long zone_page_state_snapshot(struct zone *zone, | |
148 | enum zone_stat_item item) | |
149 | { | |
150 | long x = atomic_long_read(&zone->vm_stat[item]); | |
151 | ||
152 | #ifdef CONFIG_SMP | |
153 | int cpu; | |
154 | for_each_online_cpu(cpu) | |
155 | x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; | |
156 | ||
157 | if (x < 0) | |
158 | x = 0; | |
159 | #endif | |
160 | return x; | |
161 | } | |
162 | ||
2244b95a | 163 | #ifdef CONFIG_NUMA |
ca889e6c | 164 | |
c2d42c16 | 165 | extern unsigned long node_page_state(int node, enum zone_stat_item item); |
ca889e6c | 166 | |
2244b95a | 167 | #else |
ca889e6c | 168 | |
2244b95a | 169 | #define node_page_state(node, item) global_page_state(item) |
ca889e6c CL |
170 | |
171 | #endif /* CONFIG_NUMA */ | |
2244b95a | 172 | |
2244b95a CL |
173 | #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) |
174 | #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) | |
175 | ||
2244b95a | 176 | #ifdef CONFIG_SMP |
6cdb18ad | 177 | void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long); |
2244b95a CL |
178 | void __inc_zone_page_state(struct page *, enum zone_stat_item); |
179 | void __dec_zone_page_state(struct page *, enum zone_stat_item); | |
f6ac2354 | 180 | |
6cdb18ad | 181 | void mod_zone_page_state(struct zone *, enum zone_stat_item, long); |
2244b95a CL |
182 | void inc_zone_page_state(struct page *, enum zone_stat_item); |
183 | void dec_zone_page_state(struct page *, enum zone_stat_item); | |
184 | ||
185 | extern void inc_zone_state(struct zone *, enum zone_stat_item); | |
c8785385 CL |
186 | extern void __inc_zone_state(struct zone *, enum zone_stat_item); |
187 | extern void dec_zone_state(struct zone *, enum zone_stat_item); | |
188 | extern void __dec_zone_state(struct zone *, enum zone_stat_item); | |
2244b95a | 189 | |
0eb77e98 | 190 | void quiet_vmstat(void); |
2bb921e5 | 191 | void cpu_vm_stats_fold(int cpu); |
a6cccdc3 | 192 | void refresh_zone_stat_thresholds(void); |
b44129b3 | 193 | |
52b6f46b HD |
194 | struct ctl_table; |
195 | int vmstat_refresh(struct ctl_table *, int write, | |
196 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
197 | ||
5a883813 MK |
198 | void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); |
199 | ||
b44129b3 MG |
200 | int calculate_pressure_threshold(struct zone *zone); |
201 | int calculate_normal_threshold(struct zone *zone); | |
202 | void set_pgdat_percpu_threshold(pg_data_t *pgdat, | |
203 | int (*calculate_pressure)(struct zone *)); | |
2244b95a CL |
204 | #else /* CONFIG_SMP */ |
205 | ||
206 | /* | |
207 | * We do not maintain differentials in a single processor configuration. | |
208 | * The functions directly modify the zone and global counters. | |
209 | */ | |
210 | static inline void __mod_zone_page_state(struct zone *zone, | |
6cdb18ad | 211 | enum zone_stat_item item, long delta) |
2244b95a CL |
212 | { |
213 | zone_page_state_add(delta, zone, item); | |
214 | } | |
215 | ||
7f4599e9 CL |
216 | static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
217 | { | |
218 | atomic_long_inc(&zone->vm_stat[item]); | |
219 | atomic_long_inc(&vm_stat[item]); | |
220 | } | |
221 | ||
c8785385 CL |
222 | static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
223 | { | |
224 | atomic_long_dec(&zone->vm_stat[item]); | |
225 | atomic_long_dec(&vm_stat[item]); | |
226 | } | |
227 | ||
6a3ed212 JW |
228 | static inline void __inc_zone_page_state(struct page *page, |
229 | enum zone_stat_item item) | |
230 | { | |
231 | __inc_zone_state(page_zone(page), item); | |
232 | } | |
233 | ||
2244b95a CL |
234 | static inline void __dec_zone_page_state(struct page *page, |
235 | enum zone_stat_item item) | |
236 | { | |
57ce36fe | 237 | __dec_zone_state(page_zone(page), item); |
2244b95a CL |
238 | } |
239 | ||
240 | /* | |
241 | * We only use atomic operations to update counters. So there is no need to | |
242 | * disable interrupts. | |
243 | */ | |
244 | #define inc_zone_page_state __inc_zone_page_state | |
245 | #define dec_zone_page_state __dec_zone_page_state | |
246 | #define mod_zone_page_state __mod_zone_page_state | |
247 | ||
6a3ed212 JW |
248 | #define inc_zone_state __inc_zone_state |
249 | #define dec_zone_state __dec_zone_state | |
250 | ||
b44129b3 | 251 | #define set_pgdat_percpu_threshold(pgdat, callback) { } |
88f5acf8 | 252 | |
a6cccdc3 | 253 | static inline void refresh_zone_stat_thresholds(void) { } |
2bb921e5 | 254 | static inline void cpu_vm_stats_fold(int cpu) { } |
0eb77e98 | 255 | static inline void quiet_vmstat(void) { } |
a6cccdc3 | 256 | |
5a883813 MK |
257 | static inline void drain_zonestat(struct zone *zone, |
258 | struct per_cpu_pageset *pset) { } | |
fa25c503 KM |
259 | #endif /* CONFIG_SMP */ |
260 | ||
d1ce749a BZ |
261 | static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, |
262 | int migratetype) | |
263 | { | |
264 | __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); | |
265 | if (is_migrate_cma(migratetype)) | |
266 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); | |
267 | } | |
268 | ||
fa25c503 | 269 | extern const char * const vmstat_text[]; |
2244b95a CL |
270 | |
271 | #endif /* _LINUX_VMSTAT_H */ |