1 #ifndef _LINUX_VMSTAT_H
2 #define _LINUX_VMSTAT_H
4 #include <linux/types.h>
5 #include <linux/percpu.h>
6 #include <linux/mmzone.h>
7 #include <linux/vm_event_item.h>
8 #include <linux/atomic.h>
10 extern int sysctl_stat_interval;
12 #ifdef CONFIG_VM_EVENT_COUNTERS
14 * Light weight per cpu counter implementation.
16 * Counters should only be incremented and no critical kernel component
17 * should rely on the counter values.
19 * Counters are handled completely inline. On many platforms the code
20 * generated will simply be the increment of a global address.
23 struct vm_event_state {
24 unsigned long event[NR_VM_EVENT_ITEMS];
27 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
30 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
31 * local_irq_disable overhead.
33 static inline void __count_vm_event(enum vm_event_item item)
35 raw_cpu_inc(vm_event_states.event[item]);
38 static inline void count_vm_event(enum vm_event_item item)
40 this_cpu_inc(vm_event_states.event[item]);
43 static inline void __count_vm_events(enum vm_event_item item, long delta)
45 raw_cpu_add(vm_event_states.event[item], delta);
48 static inline void count_vm_events(enum vm_event_item item, long delta)
50 this_cpu_add(vm_event_states.event[item], delta);
53 extern void all_vm_events(unsigned long *);
55 extern void vm_events_fold_cpu(int cpu);
59 /* Disable counters */
60 static inline void count_vm_event(enum vm_event_item item)
63 static inline void count_vm_events(enum vm_event_item item, long delta)
66 static inline void __count_vm_event(enum vm_event_item item)
69 static inline void __count_vm_events(enum vm_event_item item, long delta)
72 static inline void all_vm_events(unsigned long *ret)
75 static inline void vm_events_fold_cpu(int cpu)
79 #endif /* CONFIG_VM_EVENT_COUNTERS */
81 #ifdef CONFIG_NUMA_BALANCING
82 #define count_vm_numa_event(x) count_vm_event(x)
83 #define count_vm_numa_events(x, y) count_vm_events(x, y)
85 #define count_vm_numa_event(x) do {} while (0)
86 #define count_vm_numa_events(x, y) do { (void)(y); } while (0)
87 #endif /* CONFIG_NUMA_BALANCING */
89 #ifdef CONFIG_DEBUG_TLBFLUSH
90 #define count_vm_tlb_event(x) count_vm_event(x)
91 #define count_vm_tlb_events(x, y) count_vm_events(x, y)
93 #define count_vm_tlb_event(x) do {} while (0)
94 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
97 #ifdef CONFIG_DEBUG_VM_VMACACHE
98 #define count_vm_vmacache_event(x) count_vm_event(x)
100 #define count_vm_vmacache_event(x) do {} while (0)
103 #define __count_zid_vm_events(item, zid, delta) \
104 __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
107 * Zone and node-based page accounting with per cpu differentials.
109 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
110 extern atomic_long_t vm_numa_stat[NR_VM_NUMA_STAT_ITEMS];
111 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
114 static inline void zone_numa_state_add(long x, struct zone *zone,
115 enum numa_stat_item item)
117 atomic_long_add(x, &zone->vm_numa_stat[item]);
118 atomic_long_add(x, &vm_numa_stat[item]);
121 static inline unsigned long global_numa_state(enum numa_stat_item item)
123 long x = atomic_long_read(&vm_numa_stat[item]);
128 static inline unsigned long zone_numa_state_snapshot(struct zone *zone,
129 enum numa_stat_item item)
131 long x = atomic_long_read(&zone->vm_numa_stat[item]);
134 for_each_online_cpu(cpu)
135 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item];
139 #endif /* CONFIG_NUMA */
141 static inline void zone_page_state_add(long x, struct zone *zone,
142 enum zone_stat_item item)
144 atomic_long_add(x, &zone->vm_stat[item]);
145 atomic_long_add(x, &vm_zone_stat[item]);
148 static inline void node_page_state_add(long x, struct pglist_data *pgdat,
149 enum node_stat_item item)
151 atomic_long_add(x, &pgdat->vm_stat[item]);
152 atomic_long_add(x, &vm_node_stat[item]);
155 static inline unsigned long global_zone_page_state(enum zone_stat_item item)
157 long x = atomic_long_read(&vm_zone_stat[item]);
165 static inline unsigned long global_node_page_state(enum node_stat_item item)
167 long x = atomic_long_read(&vm_node_stat[item]);
175 static inline unsigned long zone_page_state(struct zone *zone,
176 enum zone_stat_item item)
178 long x = atomic_long_read(&zone->vm_stat[item]);
187 * More accurate version that also considers the currently pending
188 * deltas. For that we need to loop over all cpus to find the current
189 * deltas. There is no synchronization so the result cannot be
190 * exactly accurate either.
192 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
193 enum zone_stat_item item)
195 long x = atomic_long_read(&zone->vm_stat[item]);
199 for_each_online_cpu(cpu)
200 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
208 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat,
209 enum node_stat_item item)
211 long x = atomic_long_read(&pgdat->vm_stat[item]);
215 for_each_online_cpu(cpu)
216 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item];
226 extern void __inc_numa_state(struct zone *zone, enum numa_stat_item item);
227 extern unsigned long sum_zone_node_page_state(int node,
228 enum zone_stat_item item);
229 extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item);
230 extern unsigned long node_page_state(struct pglist_data *pgdat,
231 enum node_stat_item item);
233 #define sum_zone_node_page_state(node, item) global_zone_page_state(item)
234 #define node_page_state(node, item) global_node_page_state(item)
235 #endif /* CONFIG_NUMA */
237 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
238 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
239 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d)
240 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d))
243 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
244 void __inc_zone_page_state(struct page *, enum zone_stat_item);
245 void __dec_zone_page_state(struct page *, enum zone_stat_item);
247 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
248 void __inc_node_page_state(struct page *, enum node_stat_item);
249 void __dec_node_page_state(struct page *, enum node_stat_item);
251 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
252 void inc_zone_page_state(struct page *, enum zone_stat_item);
253 void dec_zone_page_state(struct page *, enum zone_stat_item);
255 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
256 void inc_node_page_state(struct page *, enum node_stat_item);
257 void dec_node_page_state(struct page *, enum node_stat_item);
259 extern void inc_node_state(struct pglist_data *, enum node_stat_item);
260 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
261 extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
262 extern void dec_zone_state(struct zone *, enum zone_stat_item);
263 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
264 extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
266 void quiet_vmstat(void);
267 void cpu_vm_stats_fold(int cpu);
268 void refresh_zone_stat_thresholds(void);
271 int vmstat_refresh(struct ctl_table *, int write,
272 void __user *buffer, size_t *lenp, loff_t *ppos);
274 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
276 int calculate_pressure_threshold(struct zone *zone);
277 int calculate_normal_threshold(struct zone *zone);
278 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
279 int (*calculate_pressure)(struct zone *));
280 #else /* CONFIG_SMP */
283 * We do not maintain differentials in a single processor configuration.
284 * The functions directly modify the zone and global counters.
286 static inline void __mod_zone_page_state(struct zone *zone,
287 enum zone_stat_item item, long delta)
289 zone_page_state_add(delta, zone, item);
292 static inline void __mod_node_page_state(struct pglist_data *pgdat,
293 enum node_stat_item item, int delta)
295 node_page_state_add(delta, pgdat, item);
298 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
300 atomic_long_inc(&zone->vm_stat[item]);
301 atomic_long_inc(&vm_zone_stat[item]);
304 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
306 atomic_long_inc(&pgdat->vm_stat[item]);
307 atomic_long_inc(&vm_node_stat[item]);
310 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
312 atomic_long_dec(&zone->vm_stat[item]);
313 atomic_long_dec(&vm_zone_stat[item]);
316 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
318 atomic_long_dec(&pgdat->vm_stat[item]);
319 atomic_long_dec(&vm_node_stat[item]);
322 static inline void __inc_zone_page_state(struct page *page,
323 enum zone_stat_item item)
325 __inc_zone_state(page_zone(page), item);
328 static inline void __inc_node_page_state(struct page *page,
329 enum node_stat_item item)
331 __inc_node_state(page_pgdat(page), item);
335 static inline void __dec_zone_page_state(struct page *page,
336 enum zone_stat_item item)
338 __dec_zone_state(page_zone(page), item);
341 static inline void __dec_node_page_state(struct page *page,
342 enum node_stat_item item)
344 __dec_node_state(page_pgdat(page), item);
349 * We only use atomic operations to update counters. So there is no need to
350 * disable interrupts.
352 #define inc_zone_page_state __inc_zone_page_state
353 #define dec_zone_page_state __dec_zone_page_state
354 #define mod_zone_page_state __mod_zone_page_state
356 #define inc_node_page_state __inc_node_page_state
357 #define dec_node_page_state __dec_node_page_state
358 #define mod_node_page_state __mod_node_page_state
360 #define inc_zone_state __inc_zone_state
361 #define inc_node_state __inc_node_state
362 #define dec_zone_state __dec_zone_state
364 #define set_pgdat_percpu_threshold(pgdat, callback) { }
366 static inline void refresh_zone_stat_thresholds(void) { }
367 static inline void cpu_vm_stats_fold(int cpu) { }
368 static inline void quiet_vmstat(void) { }
370 static inline void drain_zonestat(struct zone *zone,
371 struct per_cpu_pageset *pset) { }
372 #endif /* CONFIG_SMP */
374 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
377 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
378 if (is_migrate_cma(migratetype))
379 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
382 extern const char * const vmstat_text[];
384 #endif /* _LINUX_VMSTAT_H */