1 #ifndef _LINUX_VMSTAT_H
2 #define _LINUX_VMSTAT_H
4 #include <linux/types.h>
5 #include <linux/percpu.h>
7 #include <linux/mmzone.h>
8 #include <linux/vm_event_item.h>
9 #include <linux/atomic.h>
11 extern int sysctl_stat_interval;
13 #ifdef CONFIG_VM_EVENT_COUNTERS
15 * Light weight per cpu counter implementation.
17 * Counters should only be incremented and no critical kernel component
18 * should rely on the counter values.
20 * Counters are handled completely inline. On many platforms the code
21 * generated will simply be the increment of a global address.
24 struct vm_event_state {
25 unsigned long event[NR_VM_EVENT_ITEMS];
28 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
30 static inline void __count_vm_event(enum vm_event_item item)
32 __this_cpu_inc(vm_event_states.event[item]);
35 static inline void count_vm_event(enum vm_event_item item)
37 this_cpu_inc(vm_event_states.event[item]);
40 static inline void __count_vm_events(enum vm_event_item item, long delta)
42 __this_cpu_add(vm_event_states.event[item], delta);
45 static inline void count_vm_events(enum vm_event_item item, long delta)
47 this_cpu_add(vm_event_states.event[item], delta);
50 extern void all_vm_events(unsigned long *);
52 extern void vm_events_fold_cpu(int cpu);
56 /* Disable counters */
57 static inline void count_vm_event(enum vm_event_item item)
60 static inline void count_vm_events(enum vm_event_item item, long delta)
63 static inline void __count_vm_event(enum vm_event_item item)
66 static inline void __count_vm_events(enum vm_event_item item, long delta)
69 static inline void all_vm_events(unsigned long *ret)
72 static inline void vm_events_fold_cpu(int cpu)
76 #endif /* CONFIG_VM_EVENT_COUNTERS */
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)
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 */
86 #define __count_zone_vm_events(item, zone, delta) \
87 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
88 zone_idx(zone), delta)
91 * Zone based page accounting with per cpu differentials.
93 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
95 static inline void zone_page_state_add(long x, struct zone *zone,
96 enum zone_stat_item item)
98 atomic_long_add(x, &zone->vm_stat[item]);
99 atomic_long_add(x, &vm_stat[item]);
102 static inline unsigned long global_page_state(enum zone_stat_item item)
104 long x = atomic_long_read(&vm_stat[item]);
112 static inline unsigned long zone_page_state(struct zone *zone,
113 enum zone_stat_item item)
115 long x = atomic_long_read(&zone->vm_stat[item]);
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.
129 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
130 enum zone_stat_item item)
132 long x = atomic_long_read(&zone->vm_stat[item]);
136 for_each_online_cpu(cpu)
137 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
145 extern unsigned long global_reclaimable_pages(void);
146 extern unsigned long zone_reclaimable_pages(struct zone *zone);
150 * Determine the per node value of a stat item. This function
151 * is called frequently in a NUMA machine, so try to be as
152 * frugal as possible.
154 static inline unsigned long node_page_state(int node,
155 enum zone_stat_item item)
157 struct zone *zones = NODE_DATA(node)->node_zones;
160 #ifdef CONFIG_ZONE_DMA
161 zone_page_state(&zones[ZONE_DMA], item) +
163 #ifdef CONFIG_ZONE_DMA32
164 zone_page_state(&zones[ZONE_DMA32], item) +
166 #ifdef CONFIG_HIGHMEM
167 zone_page_state(&zones[ZONE_HIGHMEM], item) +
169 zone_page_state(&zones[ZONE_NORMAL], item) +
170 zone_page_state(&zones[ZONE_MOVABLE], item);
173 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
177 #define node_page_state(node, item) global_page_state(item)
178 #define zone_statistics(_zl, _z, gfp) do { } while (0)
180 #endif /* CONFIG_NUMA */
182 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
183 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
185 extern void inc_zone_state(struct zone *, enum zone_stat_item);
188 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
189 void __inc_zone_page_state(struct page *, enum zone_stat_item);
190 void __dec_zone_page_state(struct page *, enum zone_stat_item);
192 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
193 void inc_zone_page_state(struct page *, enum zone_stat_item);
194 void dec_zone_page_state(struct page *, enum zone_stat_item);
196 extern void inc_zone_state(struct zone *, enum zone_stat_item);
197 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
198 extern void dec_zone_state(struct zone *, enum zone_stat_item);
199 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
201 void cpu_vm_stats_fold(int cpu);
202 void refresh_zone_stat_thresholds(void);
204 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
206 int calculate_pressure_threshold(struct zone *zone);
207 int calculate_normal_threshold(struct zone *zone);
208 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
209 int (*calculate_pressure)(struct zone *));
210 #else /* CONFIG_SMP */
213 * We do not maintain differentials in a single processor configuration.
214 * The functions directly modify the zone and global counters.
216 static inline void __mod_zone_page_state(struct zone *zone,
217 enum zone_stat_item item, int delta)
219 zone_page_state_add(delta, zone, item);
222 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
224 atomic_long_inc(&zone->vm_stat[item]);
225 atomic_long_inc(&vm_stat[item]);
228 static inline void __inc_zone_page_state(struct page *page,
229 enum zone_stat_item item)
231 __inc_zone_state(page_zone(page), item);
234 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
236 atomic_long_dec(&zone->vm_stat[item]);
237 atomic_long_dec(&vm_stat[item]);
240 static inline void __dec_zone_page_state(struct page *page,
241 enum zone_stat_item item)
243 __dec_zone_state(page_zone(page), item);
247 * We only use atomic operations to update counters. So there is no need to
248 * disable interrupts.
250 #define inc_zone_page_state __inc_zone_page_state
251 #define dec_zone_page_state __dec_zone_page_state
252 #define mod_zone_page_state __mod_zone_page_state
254 #define set_pgdat_percpu_threshold(pgdat, callback) { }
256 static inline void refresh_cpu_vm_stats(int cpu) { }
257 static inline void refresh_zone_stat_thresholds(void) { }
258 static inline void cpu_vm_stats_fold(int cpu) { }
260 static inline void drain_zonestat(struct zone *zone,
261 struct per_cpu_pageset *pset) { }
262 #endif /* CONFIG_SMP */
264 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
267 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
268 if (is_migrate_cma(migratetype))
269 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
272 extern const char * const vmstat_text[];
274 #endif /* _LINUX_VMSTAT_H */