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);
31 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
32 * local_irq_disable overhead.
34 static inline void __count_vm_event(enum vm_event_item item)
36 raw_cpu_inc(vm_event_states.event[item]);
39 static inline void count_vm_event(enum vm_event_item item)
41 this_cpu_inc(vm_event_states.event[item]);
44 static inline void __count_vm_events(enum vm_event_item item, long delta)
46 raw_cpu_add(vm_event_states.event[item], delta);
49 static inline void count_vm_events(enum vm_event_item item, long delta)
51 this_cpu_add(vm_event_states.event[item], delta);
54 extern void all_vm_events(unsigned long *);
56 extern void vm_events_fold_cpu(int cpu);
60 /* Disable counters */
61 static inline void count_vm_event(enum vm_event_item item)
64 static inline void count_vm_events(enum vm_event_item item, long delta)
67 static inline void __count_vm_event(enum vm_event_item item)
70 static inline void __count_vm_events(enum vm_event_item item, long delta)
73 static inline void all_vm_events(unsigned long *ret)
76 static inline void vm_events_fold_cpu(int cpu)
80 #endif /* CONFIG_VM_EVENT_COUNTERS */
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)
86 #define count_vm_numa_event(x) do {} while (0)
87 #define count_vm_numa_events(x, y) do { (void)(y); } while (0)
88 #endif /* CONFIG_NUMA_BALANCING */
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)
94 #define count_vm_tlb_event(x) do {} while (0)
95 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
98 #ifdef CONFIG_DEBUG_VM_VMACACHE
99 #define count_vm_vmacache_event(x) count_vm_event(x)
101 #define count_vm_vmacache_event(x) do {} while (0)
104 #define __count_zone_vm_events(item, zone, delta) \
105 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
106 zone_idx(zone), delta)
109 * Zone and node-based page accounting with per cpu differentials.
111 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
112 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
114 static inline void zone_page_state_add(long x, struct zone *zone,
115 enum zone_stat_item item)
117 atomic_long_add(x, &zone->vm_stat[item]);
118 atomic_long_add(x, &vm_zone_stat[item]);
121 static inline void node_page_state_add(long x, struct pglist_data *pgdat,
122 enum node_stat_item item)
124 atomic_long_add(x, &pgdat->vm_stat[item]);
125 atomic_long_add(x, &vm_node_stat[item]);
128 static inline unsigned long global_page_state(enum zone_stat_item item)
130 long x = atomic_long_read(&vm_zone_stat[item]);
138 static inline unsigned long global_node_page_state(enum node_stat_item item)
140 long x = atomic_long_read(&vm_node_stat[item]);
148 static inline unsigned long zone_page_state(struct zone *zone,
149 enum zone_stat_item item)
151 long x = atomic_long_read(&zone->vm_stat[item]);
160 * More accurate version that also considers the currently pending
161 * deltas. For that we need to loop over all cpus to find the current
162 * deltas. There is no synchronization so the result cannot be
163 * exactly accurate either.
165 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
166 enum zone_stat_item item)
168 long x = atomic_long_read(&zone->vm_stat[item]);
172 for_each_online_cpu(cpu)
173 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
181 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat,
182 enum node_stat_item item)
184 long x = atomic_long_read(&pgdat->vm_stat[item]);
188 for_each_online_cpu(cpu)
189 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item];
199 extern unsigned long sum_zone_node_page_state(int node,
200 enum zone_stat_item item);
201 extern unsigned long node_page_state(struct pglist_data *pgdat,
202 enum node_stat_item item);
204 #define sum_zone_node_page_state(node, item) global_page_state(item)
205 #define node_page_state(node, item) global_node_page_state(item)
206 #endif /* CONFIG_NUMA */
208 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
209 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
210 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d)
211 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d))
214 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
215 void __inc_zone_page_state(struct page *, enum zone_stat_item);
216 void __dec_zone_page_state(struct page *, enum zone_stat_item);
218 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
219 void __inc_node_page_state(struct page *, enum node_stat_item);
220 void __dec_node_page_state(struct page *, enum node_stat_item);
222 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
223 void inc_zone_page_state(struct page *, enum zone_stat_item);
224 void dec_zone_page_state(struct page *, enum zone_stat_item);
226 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
227 void inc_node_page_state(struct page *, enum node_stat_item);
228 void dec_node_page_state(struct page *, enum node_stat_item);
230 extern void inc_node_state(struct pglist_data *, enum node_stat_item);
231 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
232 extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
233 extern void dec_zone_state(struct zone *, enum zone_stat_item);
234 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
235 extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
237 void quiet_vmstat(void);
238 void cpu_vm_stats_fold(int cpu);
239 void refresh_zone_stat_thresholds(void);
242 int vmstat_refresh(struct ctl_table *, int write,
243 void __user *buffer, size_t *lenp, loff_t *ppos);
245 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
247 int calculate_pressure_threshold(struct zone *zone);
248 int calculate_normal_threshold(struct zone *zone);
249 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
250 int (*calculate_pressure)(struct zone *));
251 #else /* CONFIG_SMP */
254 * We do not maintain differentials in a single processor configuration.
255 * The functions directly modify the zone and global counters.
257 static inline void __mod_zone_page_state(struct zone *zone,
258 enum zone_stat_item item, long delta)
260 zone_page_state_add(delta, zone, item);
263 static inline void __mod_node_page_state(struct pglist_data *pgdat,
264 enum node_stat_item item, int delta)
266 node_page_state_add(delta, pgdat, item);
269 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
271 atomic_long_inc(&zone->vm_stat[item]);
272 atomic_long_inc(&vm_zone_stat[item]);
275 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
277 atomic_long_inc(&pgdat->vm_stat[item]);
278 atomic_long_inc(&vm_node_stat[item]);
281 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
283 atomic_long_dec(&zone->vm_stat[item]);
284 atomic_long_dec(&vm_zone_stat[item]);
287 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
289 atomic_long_dec(&pgdat->vm_stat[item]);
290 atomic_long_dec(&vm_node_stat[item]);
293 static inline void __inc_zone_page_state(struct page *page,
294 enum zone_stat_item item)
296 __inc_zone_state(page_zone(page), item);
299 static inline void __inc_node_page_state(struct page *page,
300 enum node_stat_item item)
302 __inc_node_state(page_pgdat(page), item);
306 static inline void __dec_zone_page_state(struct page *page,
307 enum zone_stat_item item)
309 __dec_zone_state(page_zone(page), item);
312 static inline void __dec_node_page_state(struct page *page,
313 enum node_stat_item item)
315 __dec_node_state(page_pgdat(page), item);
320 * We only use atomic operations to update counters. So there is no need to
321 * disable interrupts.
323 #define inc_zone_page_state __inc_zone_page_state
324 #define dec_zone_page_state __dec_zone_page_state
325 #define mod_zone_page_state __mod_zone_page_state
327 #define inc_node_page_state __inc_node_page_state
328 #define dec_node_page_state __dec_node_page_state
329 #define mod_node_page_state __mod_node_page_state
331 #define inc_zone_state __inc_zone_state
332 #define inc_node_state __inc_node_state
333 #define dec_zone_state __dec_zone_state
335 #define set_pgdat_percpu_threshold(pgdat, callback) { }
337 static inline void refresh_zone_stat_thresholds(void) { }
338 static inline void cpu_vm_stats_fold(int cpu) { }
339 static inline void quiet_vmstat(void) { }
341 static inline void drain_zonestat(struct zone *zone,
342 struct per_cpu_pageset *pset) { }
343 #endif /* CONFIG_SMP */
345 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
348 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
349 if (is_migrate_cma(migratetype))
350 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
353 extern const char * const vmstat_text[];
355 #endif /* _LINUX_VMSTAT_H */