1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_VMSTAT_H
3 #define _LINUX_VMSTAT_H
5 #include <linux/types.h>
6 #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_zid_vm_events(item, zid, delta) \
105 __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
108 * Zone and node-based page accounting with per cpu differentials.
110 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
111 extern atomic_long_t vm_numa_stat[NR_VM_NUMA_STAT_ITEMS];
112 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
115 static inline void zone_numa_state_add(long x, struct zone *zone,
116 enum numa_stat_item item)
118 atomic_long_add(x, &zone->vm_numa_stat[item]);
119 atomic_long_add(x, &vm_numa_stat[item]);
122 static inline unsigned long global_numa_state(enum numa_stat_item item)
124 long x = atomic_long_read(&vm_numa_stat[item]);
129 static inline unsigned long zone_numa_state_snapshot(struct zone *zone,
130 enum numa_stat_item item)
132 long x = atomic_long_read(&zone->vm_numa_stat[item]);
135 for_each_online_cpu(cpu)
136 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item];
140 #endif /* CONFIG_NUMA */
142 static inline void zone_page_state_add(long x, struct zone *zone,
143 enum zone_stat_item item)
145 atomic_long_add(x, &zone->vm_stat[item]);
146 atomic_long_add(x, &vm_zone_stat[item]);
149 static inline void node_page_state_add(long x, struct pglist_data *pgdat,
150 enum node_stat_item item)
152 atomic_long_add(x, &pgdat->vm_stat[item]);
153 atomic_long_add(x, &vm_node_stat[item]);
156 static inline unsigned long global_zone_page_state(enum zone_stat_item item)
158 long x = atomic_long_read(&vm_zone_stat[item]);
166 static inline unsigned long global_node_page_state(enum node_stat_item item)
168 long x = atomic_long_read(&vm_node_stat[item]);
176 static inline unsigned long zone_page_state(struct zone *zone,
177 enum zone_stat_item item)
179 long x = atomic_long_read(&zone->vm_stat[item]);
188 * More accurate version that also considers the currently pending
189 * deltas. For that we need to loop over all cpus to find the current
190 * deltas. There is no synchronization so the result cannot be
191 * exactly accurate either.
193 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
194 enum zone_stat_item item)
196 long x = atomic_long_read(&zone->vm_stat[item]);
200 for_each_online_cpu(cpu)
201 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
209 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat,
210 enum node_stat_item item)
212 long x = atomic_long_read(&pgdat->vm_stat[item]);
216 for_each_online_cpu(cpu)
217 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item];
227 extern void __inc_numa_state(struct zone *zone, enum numa_stat_item item);
228 extern unsigned long sum_zone_node_page_state(int node,
229 enum zone_stat_item item);
230 extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item);
231 extern unsigned long node_page_state(struct pglist_data *pgdat,
232 enum node_stat_item item);
234 #define sum_zone_node_page_state(node, item) global_zone_page_state(item)
235 #define node_page_state(node, item) global_node_page_state(item)
236 #endif /* CONFIG_NUMA */
238 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
239 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
240 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d)
241 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d))
244 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
245 void __inc_zone_page_state(struct page *, enum zone_stat_item);
246 void __dec_zone_page_state(struct page *, enum zone_stat_item);
248 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
249 void __inc_node_page_state(struct page *, enum node_stat_item);
250 void __dec_node_page_state(struct page *, enum node_stat_item);
252 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
253 void inc_zone_page_state(struct page *, enum zone_stat_item);
254 void dec_zone_page_state(struct page *, enum zone_stat_item);
256 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
257 void inc_node_page_state(struct page *, enum node_stat_item);
258 void dec_node_page_state(struct page *, enum node_stat_item);
260 extern void inc_node_state(struct pglist_data *, enum node_stat_item);
261 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
262 extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
263 extern void dec_zone_state(struct zone *, enum zone_stat_item);
264 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
265 extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
267 void quiet_vmstat(void);
268 void cpu_vm_stats_fold(int cpu);
269 void refresh_zone_stat_thresholds(void);
272 int vmstat_refresh(struct ctl_table *, int write,
273 void __user *buffer, size_t *lenp, loff_t *ppos);
275 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
277 int calculate_pressure_threshold(struct zone *zone);
278 int calculate_normal_threshold(struct zone *zone);
279 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
280 int (*calculate_pressure)(struct zone *));
281 #else /* CONFIG_SMP */
284 * We do not maintain differentials in a single processor configuration.
285 * The functions directly modify the zone and global counters.
287 static inline void __mod_zone_page_state(struct zone *zone,
288 enum zone_stat_item item, long delta)
290 zone_page_state_add(delta, zone, item);
293 static inline void __mod_node_page_state(struct pglist_data *pgdat,
294 enum node_stat_item item, int delta)
296 node_page_state_add(delta, pgdat, item);
299 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
301 atomic_long_inc(&zone->vm_stat[item]);
302 atomic_long_inc(&vm_zone_stat[item]);
305 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
307 atomic_long_inc(&pgdat->vm_stat[item]);
308 atomic_long_inc(&vm_node_stat[item]);
311 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
313 atomic_long_dec(&zone->vm_stat[item]);
314 atomic_long_dec(&vm_zone_stat[item]);
317 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
319 atomic_long_dec(&pgdat->vm_stat[item]);
320 atomic_long_dec(&vm_node_stat[item]);
323 static inline void __inc_zone_page_state(struct page *page,
324 enum zone_stat_item item)
326 __inc_zone_state(page_zone(page), item);
329 static inline void __inc_node_page_state(struct page *page,
330 enum node_stat_item item)
332 __inc_node_state(page_pgdat(page), item);
336 static inline void __dec_zone_page_state(struct page *page,
337 enum zone_stat_item item)
339 __dec_zone_state(page_zone(page), item);
342 static inline void __dec_node_page_state(struct page *page,
343 enum node_stat_item item)
345 __dec_node_state(page_pgdat(page), item);
350 * We only use atomic operations to update counters. So there is no need to
351 * disable interrupts.
353 #define inc_zone_page_state __inc_zone_page_state
354 #define dec_zone_page_state __dec_zone_page_state
355 #define mod_zone_page_state __mod_zone_page_state
357 #define inc_node_page_state __inc_node_page_state
358 #define dec_node_page_state __dec_node_page_state
359 #define mod_node_page_state __mod_node_page_state
361 #define inc_zone_state __inc_zone_state
362 #define inc_node_state __inc_node_state
363 #define dec_zone_state __dec_zone_state
365 #define set_pgdat_percpu_threshold(pgdat, callback) { }
367 static inline void refresh_zone_stat_thresholds(void) { }
368 static inline void cpu_vm_stats_fold(int cpu) { }
369 static inline void quiet_vmstat(void) { }
371 static inline void drain_zonestat(struct zone *zone,
372 struct per_cpu_pageset *pset) { }
373 #endif /* CONFIG_SMP */
375 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
378 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
379 if (is_migrate_cma(migratetype))
380 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
383 extern const char * const vmstat_text[];
385 #endif /* _LINUX_VMSTAT_H */