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1 #ifndef _LINUX_VMSTAT_H
2 #define _LINUX_VMSTAT_H
3
4 #include <linux/types.h>
5 #include <linux/percpu.h>
6 #include <linux/mm.h>
7 #include <linux/mmzone.h>
8 #include <linux/vm_event_item.h>
9 #include <linux/atomic.h>
10
11 extern int sysctl_stat_interval;
12
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
24 struct vm_event_state {
25 unsigned long event[NR_VM_EVENT_ITEMS];
26 };
27
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 {
32 __this_cpu_inc(vm_event_states.event[item]);
33 }
34
35 static inline void count_vm_event(enum vm_event_item item)
36 {
37 this_cpu_inc(vm_event_states.event[item]);
38 }
39
40 static inline void __count_vm_events(enum vm_event_item item, long delta)
41 {
42 __this_cpu_add(vm_event_states.event[item], delta);
43 }
44
45 static inline void count_vm_events(enum vm_event_item item, long delta)
46 {
47 this_cpu_add(vm_event_states.event[item], delta);
48 }
49
50 extern void all_vm_events(unsigned long *);
51
52 extern void vm_events_fold_cpu(int cpu);
53
54 #else
55
56 /* Disable counters */
57 static inline void count_vm_event(enum vm_event_item item)
58 {
59 }
60 static inline void count_vm_events(enum vm_event_item item, long delta)
61 {
62 }
63 static inline void __count_vm_event(enum vm_event_item item)
64 {
65 }
66 static inline void __count_vm_events(enum vm_event_item item, long delta)
67 {
68 }
69 static inline void all_vm_events(unsigned long *ret)
70 {
71 }
72 static inline void vm_events_fold_cpu(int cpu)
73 {
74 }
75
76 #endif /* CONFIG_VM_EVENT_COUNTERS */
77
78 #ifdef CONFIG_NUMA_BALANCING
79 #define count_vm_numa_event(x) count_vm_event(x)
80 #define count_vm_numa_events(x, y) count_vm_events(x, y)
81 #else
82 #define count_vm_numa_event(x) do {} while (0)
83 #define count_vm_numa_events(x, y) do { (void)(y); } while (0)
84 #endif /* CONFIG_NUMA_BALANCING */
85
86 #define __count_zone_vm_events(item, zone, delta) \
87 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
88 zone_idx(zone), delta)
89
90 /*
91 * Zone based page accounting with per cpu differentials.
92 */
93 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
94
95 static inline void zone_page_state_add(long x, struct zone *zone,
96 enum zone_stat_item item)
97 {
98 atomic_long_add(x, &zone->vm_stat[item]);
99 atomic_long_add(x, &vm_stat[item]);
100 }
101
102 static inline unsigned long global_page_state(enum zone_stat_item item)
103 {
104 long x = atomic_long_read(&vm_stat[item]);
105 #ifdef CONFIG_SMP
106 if (x < 0)
107 x = 0;
108 #endif
109 return x;
110 }
111
112 static inline unsigned long zone_page_state(struct zone *zone,
113 enum zone_stat_item item)
114 {
115 long x = atomic_long_read(&zone->vm_stat[item]);
116 #ifdef CONFIG_SMP
117 if (x < 0)
118 x = 0;
119 #endif
120 return x;
121 }
122
123 /*
124 * More accurate version that also considers the currently pending
125 * deltas. For that we need to loop over all cpus to find the current
126 * deltas. There is no synchronization so the result cannot be
127 * exactly accurate either.
128 */
129 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
130 enum zone_stat_item item)
131 {
132 long x = atomic_long_read(&zone->vm_stat[item]);
133
134 #ifdef CONFIG_SMP
135 int cpu;
136 for_each_online_cpu(cpu)
137 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
138
139 if (x < 0)
140 x = 0;
141 #endif
142 return x;
143 }
144
145 extern unsigned long global_reclaimable_pages(void);
146
147 #ifdef CONFIG_NUMA
148 /*
149 * Determine the per node value of a stat item. This function
150 * is called frequently in a NUMA machine, so try to be as
151 * frugal as possible.
152 */
153 static inline unsigned long node_page_state(int node,
154 enum zone_stat_item item)
155 {
156 struct zone *zones = NODE_DATA(node)->node_zones;
157
158 return
159 #ifdef CONFIG_ZONE_DMA
160 zone_page_state(&zones[ZONE_DMA], item) +
161 #endif
162 #ifdef CONFIG_ZONE_DMA32
163 zone_page_state(&zones[ZONE_DMA32], item) +
164 #endif
165 #ifdef CONFIG_HIGHMEM
166 zone_page_state(&zones[ZONE_HIGHMEM], item) +
167 #endif
168 zone_page_state(&zones[ZONE_NORMAL], item) +
169 zone_page_state(&zones[ZONE_MOVABLE], item);
170 }
171
172 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
173
174 #else
175
176 #define node_page_state(node, item) global_page_state(item)
177 #define zone_statistics(_zl, _z, gfp) do { } while (0)
178
179 #endif /* CONFIG_NUMA */
180
181 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
182 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
183
184 extern void inc_zone_state(struct zone *, enum zone_stat_item);
185
186 #ifdef CONFIG_SMP
187 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
188 void __inc_zone_page_state(struct page *, enum zone_stat_item);
189 void __dec_zone_page_state(struct page *, enum zone_stat_item);
190
191 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
192 void inc_zone_page_state(struct page *, enum zone_stat_item);
193 void dec_zone_page_state(struct page *, enum zone_stat_item);
194
195 extern void inc_zone_state(struct zone *, enum zone_stat_item);
196 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
197 extern void dec_zone_state(struct zone *, enum zone_stat_item);
198 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
199
200 void cpu_vm_stats_fold(int cpu);
201 void refresh_zone_stat_thresholds(void);
202
203 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
204
205 int calculate_pressure_threshold(struct zone *zone);
206 int calculate_normal_threshold(struct zone *zone);
207 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
208 int (*calculate_pressure)(struct zone *));
209 #else /* CONFIG_SMP */
210
211 /*
212 * We do not maintain differentials in a single processor configuration.
213 * The functions directly modify the zone and global counters.
214 */
215 static inline void __mod_zone_page_state(struct zone *zone,
216 enum zone_stat_item item, int delta)
217 {
218 zone_page_state_add(delta, zone, item);
219 }
220
221 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
222 {
223 atomic_long_inc(&zone->vm_stat[item]);
224 atomic_long_inc(&vm_stat[item]);
225 }
226
227 static inline void __inc_zone_page_state(struct page *page,
228 enum zone_stat_item item)
229 {
230 __inc_zone_state(page_zone(page), item);
231 }
232
233 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
234 {
235 atomic_long_dec(&zone->vm_stat[item]);
236 atomic_long_dec(&vm_stat[item]);
237 }
238
239 static inline void __dec_zone_page_state(struct page *page,
240 enum zone_stat_item item)
241 {
242 __dec_zone_state(page_zone(page), item);
243 }
244
245 /*
246 * We only use atomic operations to update counters. So there is no need to
247 * disable interrupts.
248 */
249 #define inc_zone_page_state __inc_zone_page_state
250 #define dec_zone_page_state __dec_zone_page_state
251 #define mod_zone_page_state __mod_zone_page_state
252
253 #define set_pgdat_percpu_threshold(pgdat, callback) { }
254
255 static inline void refresh_cpu_vm_stats(int cpu) { }
256 static inline void refresh_zone_stat_thresholds(void) { }
257 static inline void cpu_vm_stats_fold(int cpu) { }
258
259 static inline void drain_zonestat(struct zone *zone,
260 struct per_cpu_pageset *pset) { }
261 #endif /* CONFIG_SMP */
262
263 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
264 int migratetype)
265 {
266 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
267 if (is_migrate_cma(migratetype))
268 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
269 }
270
271 extern const char * const vmstat_text[];
272
273 #endif /* _LINUX_VMSTAT_H */