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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 | ||
f8891e5e | 98 | #define __count_zone_vm_events(item, zone, delta) \ |
4b51d669 CL |
99 | __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ |
100 | zone_idx(zone), delta) | |
f6ac2354 | 101 | |
2244b95a CL |
102 | /* |
103 | * Zone based page accounting with per cpu differentials. | |
104 | */ | |
105 | extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
106 | ||
107 | static inline void zone_page_state_add(long x, struct zone *zone, | |
108 | enum zone_stat_item item) | |
109 | { | |
110 | atomic_long_add(x, &zone->vm_stat[item]); | |
111 | atomic_long_add(x, &vm_stat[item]); | |
112 | } | |
113 | ||
114 | static inline unsigned long global_page_state(enum zone_stat_item item) | |
115 | { | |
116 | long x = atomic_long_read(&vm_stat[item]); | |
117 | #ifdef CONFIG_SMP | |
118 | if (x < 0) | |
119 | x = 0; | |
120 | #endif | |
121 | return x; | |
122 | } | |
123 | ||
124 | static inline unsigned long zone_page_state(struct zone *zone, | |
125 | enum zone_stat_item item) | |
126 | { | |
127 | long x = atomic_long_read(&zone->vm_stat[item]); | |
128 | #ifdef CONFIG_SMP | |
129 | if (x < 0) | |
130 | x = 0; | |
131 | #endif | |
132 | return x; | |
133 | } | |
134 | ||
aa454840 CL |
135 | /* |
136 | * More accurate version that also considers the currently pending | |
137 | * deltas. For that we need to loop over all cpus to find the current | |
138 | * deltas. There is no synchronization so the result cannot be | |
139 | * exactly accurate either. | |
140 | */ | |
141 | static inline unsigned long zone_page_state_snapshot(struct zone *zone, | |
142 | enum zone_stat_item item) | |
143 | { | |
144 | long x = atomic_long_read(&zone->vm_stat[item]); | |
145 | ||
146 | #ifdef CONFIG_SMP | |
147 | int cpu; | |
148 | for_each_online_cpu(cpu) | |
149 | x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; | |
150 | ||
151 | if (x < 0) | |
152 | x = 0; | |
153 | #endif | |
154 | return x; | |
155 | } | |
156 | ||
2244b95a CL |
157 | #ifdef CONFIG_NUMA |
158 | /* | |
159 | * Determine the per node value of a stat item. This function | |
160 | * is called frequently in a NUMA machine, so try to be as | |
161 | * frugal as possible. | |
162 | */ | |
163 | static inline unsigned long node_page_state(int node, | |
164 | enum zone_stat_item item) | |
165 | { | |
166 | struct zone *zones = NODE_DATA(node)->node_zones; | |
167 | ||
168 | return | |
4b51d669 CL |
169 | #ifdef CONFIG_ZONE_DMA |
170 | zone_page_state(&zones[ZONE_DMA], item) + | |
171 | #endif | |
fb0e7942 | 172 | #ifdef CONFIG_ZONE_DMA32 |
2244b95a CL |
173 | zone_page_state(&zones[ZONE_DMA32], item) + |
174 | #endif | |
2244b95a CL |
175 | #ifdef CONFIG_HIGHMEM |
176 | zone_page_state(&zones[ZONE_HIGHMEM], item) + | |
177 | #endif | |
2a1e274a MG |
178 | zone_page_state(&zones[ZONE_NORMAL], item) + |
179 | zone_page_state(&zones[ZONE_MOVABLE], item); | |
2244b95a | 180 | } |
ca889e6c | 181 | |
78afd561 | 182 | extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); |
ca889e6c | 183 | |
2244b95a | 184 | #else |
ca889e6c | 185 | |
2244b95a | 186 | #define node_page_state(node, item) global_page_state(item) |
78afd561 | 187 | #define zone_statistics(_zl, _z, gfp) do { } while (0) |
ca889e6c CL |
188 | |
189 | #endif /* CONFIG_NUMA */ | |
2244b95a | 190 | |
2244b95a CL |
191 | #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) |
192 | #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) | |
193 | ||
2244b95a CL |
194 | #ifdef CONFIG_SMP |
195 | void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); | |
196 | void __inc_zone_page_state(struct page *, enum zone_stat_item); | |
197 | void __dec_zone_page_state(struct page *, enum zone_stat_item); | |
f6ac2354 | 198 | |
2244b95a CL |
199 | void mod_zone_page_state(struct zone *, enum zone_stat_item, int); |
200 | void inc_zone_page_state(struct page *, enum zone_stat_item); | |
201 | void dec_zone_page_state(struct page *, enum zone_stat_item); | |
202 | ||
203 | extern void inc_zone_state(struct zone *, enum zone_stat_item); | |
c8785385 CL |
204 | extern void __inc_zone_state(struct zone *, enum zone_stat_item); |
205 | extern void dec_zone_state(struct zone *, enum zone_stat_item); | |
206 | extern void __dec_zone_state(struct zone *, enum zone_stat_item); | |
2244b95a | 207 | |
2bb921e5 | 208 | void cpu_vm_stats_fold(int cpu); |
a6cccdc3 | 209 | void refresh_zone_stat_thresholds(void); |
b44129b3 | 210 | |
5a883813 MK |
211 | void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); |
212 | ||
b44129b3 MG |
213 | int calculate_pressure_threshold(struct zone *zone); |
214 | int calculate_normal_threshold(struct zone *zone); | |
215 | void set_pgdat_percpu_threshold(pg_data_t *pgdat, | |
216 | int (*calculate_pressure)(struct zone *)); | |
2244b95a CL |
217 | #else /* CONFIG_SMP */ |
218 | ||
219 | /* | |
220 | * We do not maintain differentials in a single processor configuration. | |
221 | * The functions directly modify the zone and global counters. | |
222 | */ | |
223 | static inline void __mod_zone_page_state(struct zone *zone, | |
224 | enum zone_stat_item item, int delta) | |
225 | { | |
226 | zone_page_state_add(delta, zone, item); | |
227 | } | |
228 | ||
7f4599e9 CL |
229 | static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
230 | { | |
231 | atomic_long_inc(&zone->vm_stat[item]); | |
232 | atomic_long_inc(&vm_stat[item]); | |
233 | } | |
234 | ||
c8785385 CL |
235 | static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
236 | { | |
237 | atomic_long_dec(&zone->vm_stat[item]); | |
238 | atomic_long_dec(&vm_stat[item]); | |
239 | } | |
240 | ||
6a3ed212 JW |
241 | static inline void __inc_zone_page_state(struct page *page, |
242 | enum zone_stat_item item) | |
243 | { | |
244 | __inc_zone_state(page_zone(page), item); | |
245 | } | |
246 | ||
2244b95a CL |
247 | static inline void __dec_zone_page_state(struct page *page, |
248 | enum zone_stat_item item) | |
249 | { | |
57ce36fe | 250 | __dec_zone_state(page_zone(page), item); |
2244b95a CL |
251 | } |
252 | ||
253 | /* | |
254 | * We only use atomic operations to update counters. So there is no need to | |
255 | * disable interrupts. | |
256 | */ | |
257 | #define inc_zone_page_state __inc_zone_page_state | |
258 | #define dec_zone_page_state __dec_zone_page_state | |
259 | #define mod_zone_page_state __mod_zone_page_state | |
260 | ||
6a3ed212 JW |
261 | #define inc_zone_state __inc_zone_state |
262 | #define dec_zone_state __dec_zone_state | |
263 | ||
b44129b3 | 264 | #define set_pgdat_percpu_threshold(pgdat, callback) { } |
88f5acf8 | 265 | |
2244b95a | 266 | static inline void refresh_cpu_vm_stats(int cpu) { } |
a6cccdc3 | 267 | static inline void refresh_zone_stat_thresholds(void) { } |
2bb921e5 | 268 | static inline void cpu_vm_stats_fold(int cpu) { } |
a6cccdc3 | 269 | |
5a883813 MK |
270 | static inline void drain_zonestat(struct zone *zone, |
271 | struct per_cpu_pageset *pset) { } | |
fa25c503 KM |
272 | #endif /* CONFIG_SMP */ |
273 | ||
d1ce749a BZ |
274 | static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, |
275 | int migratetype) | |
276 | { | |
277 | __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); | |
278 | if (is_migrate_cma(migratetype)) | |
279 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); | |
280 | } | |
281 | ||
fa25c503 | 282 | extern const char * const vmstat_text[]; |
2244b95a CL |
283 | |
284 | #endif /* _LINUX_VMSTAT_H */ |