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>
10 #include <linux/static_key.h>
12 extern int sysctl_stat_interval;
15 #define ENABLE_NUMA_STAT 1
16 #define DISABLE_NUMA_STAT 0
17 extern int sysctl_vm_numa_stat;
18 DECLARE_STATIC_KEY_TRUE(vm_numa_stat_key);
19 extern int sysctl_vm_numa_stat_handler(struct ctl_table *table,
20 int write, void __user *buffer, size_t *length, loff_t *ppos);
23 #ifdef CONFIG_VM_EVENT_COUNTERS
25 * Light weight per cpu counter implementation.
27 * Counters should only be incremented and no critical kernel component
28 * should rely on the counter values.
30 * Counters are handled completely inline. On many platforms the code
31 * generated will simply be the increment of a global address.
34 struct vm_event_state {
35 unsigned long event[NR_VM_EVENT_ITEMS];
38 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
41 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
42 * local_irq_disable overhead.
44 static inline void __count_vm_event(enum vm_event_item item)
46 raw_cpu_inc(vm_event_states.event[item]);
49 static inline void count_vm_event(enum vm_event_item item)
51 this_cpu_inc(vm_event_states.event[item]);
54 static inline void __count_vm_events(enum vm_event_item item, long delta)
56 raw_cpu_add(vm_event_states.event[item], delta);
59 static inline void count_vm_events(enum vm_event_item item, long delta)
61 this_cpu_add(vm_event_states.event[item], delta);
64 extern void all_vm_events(unsigned long *);
66 extern void vm_events_fold_cpu(int cpu);
70 /* Disable counters */
71 static inline void count_vm_event(enum vm_event_item item)
74 static inline void count_vm_events(enum vm_event_item item, long delta)
77 static inline void __count_vm_event(enum vm_event_item item)
80 static inline void __count_vm_events(enum vm_event_item item, long delta)
83 static inline void all_vm_events(unsigned long *ret)
86 static inline void vm_events_fold_cpu(int cpu)
90 #endif /* CONFIG_VM_EVENT_COUNTERS */
92 #ifdef CONFIG_NUMA_BALANCING
93 #define count_vm_numa_event(x) count_vm_event(x)
94 #define count_vm_numa_events(x, y) count_vm_events(x, y)
96 #define count_vm_numa_event(x) do {} while (0)
97 #define count_vm_numa_events(x, y) do { (void)(y); } while (0)
98 #endif /* CONFIG_NUMA_BALANCING */
100 #ifdef CONFIG_DEBUG_TLBFLUSH
101 #define count_vm_tlb_event(x) count_vm_event(x)
102 #define count_vm_tlb_events(x, y) count_vm_events(x, y)
104 #define count_vm_tlb_event(x) do {} while (0)
105 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
108 #ifdef CONFIG_DEBUG_VM_VMACACHE
109 #define count_vm_vmacache_event(x) count_vm_event(x)
111 #define count_vm_vmacache_event(x) do {} while (0)
114 #define __count_zid_vm_events(item, zid, delta) \
115 __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
118 * Zone and node-based page accounting with per cpu differentials.
120 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
121 extern atomic_long_t vm_numa_stat[NR_VM_NUMA_STAT_ITEMS];
122 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
125 static inline void zone_numa_state_add(long x, struct zone *zone,
126 enum numa_stat_item item)
128 atomic_long_add(x, &zone->vm_numa_stat[item]);
129 atomic_long_add(x, &vm_numa_stat[item]);
132 static inline unsigned long global_numa_state(enum numa_stat_item item)
134 long x = atomic_long_read(&vm_numa_stat[item]);
139 static inline unsigned long zone_numa_state_snapshot(struct zone *zone,
140 enum numa_stat_item item)
142 long x = atomic_long_read(&zone->vm_numa_stat[item]);
145 for_each_online_cpu(cpu)
146 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item];
150 #endif /* CONFIG_NUMA */
152 static inline void zone_page_state_add(long x, struct zone *zone,
153 enum zone_stat_item item)
155 atomic_long_add(x, &zone->vm_stat[item]);
156 atomic_long_add(x, &vm_zone_stat[item]);
159 static inline void node_page_state_add(long x, struct pglist_data *pgdat,
160 enum node_stat_item item)
162 atomic_long_add(x, &pgdat->vm_stat[item]);
163 atomic_long_add(x, &vm_node_stat[item]);
166 static inline unsigned long global_zone_page_state(enum zone_stat_item item)
168 long x = atomic_long_read(&vm_zone_stat[item]);
176 static inline unsigned long global_node_page_state(enum node_stat_item item)
178 long x = atomic_long_read(&vm_node_stat[item]);
186 static inline unsigned long zone_page_state(struct zone *zone,
187 enum zone_stat_item item)
189 long x = atomic_long_read(&zone->vm_stat[item]);
198 * More accurate version that also considers the currently pending
199 * deltas. For that we need to loop over all cpus to find the current
200 * deltas. There is no synchronization so the result cannot be
201 * exactly accurate either.
203 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
204 enum zone_stat_item item)
206 long x = atomic_long_read(&zone->vm_stat[item]);
210 for_each_online_cpu(cpu)
211 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
219 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat,
220 enum node_stat_item item)
222 long x = atomic_long_read(&pgdat->vm_stat[item]);
226 for_each_online_cpu(cpu)
227 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item];
237 extern void __inc_numa_state(struct zone *zone, enum numa_stat_item item);
238 extern unsigned long sum_zone_node_page_state(int node,
239 enum zone_stat_item item);
240 extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item);
241 extern unsigned long node_page_state(struct pglist_data *pgdat,
242 enum node_stat_item item);
244 #define sum_zone_node_page_state(node, item) global_zone_page_state(item)
245 #define node_page_state(node, item) global_node_page_state(item)
246 #endif /* CONFIG_NUMA */
248 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
249 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
250 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d)
251 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d))
254 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
255 void __inc_zone_page_state(struct page *, enum zone_stat_item);
256 void __dec_zone_page_state(struct page *, enum zone_stat_item);
258 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
259 void __inc_node_page_state(struct page *, enum node_stat_item);
260 void __dec_node_page_state(struct page *, enum node_stat_item);
262 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
263 void inc_zone_page_state(struct page *, enum zone_stat_item);
264 void dec_zone_page_state(struct page *, enum zone_stat_item);
266 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
267 void inc_node_page_state(struct page *, enum node_stat_item);
268 void dec_node_page_state(struct page *, enum node_stat_item);
270 extern void inc_node_state(struct pglist_data *, enum node_stat_item);
271 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
272 extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
273 extern void dec_zone_state(struct zone *, enum zone_stat_item);
274 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
275 extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
277 void quiet_vmstat(void);
278 void cpu_vm_stats_fold(int cpu);
279 void refresh_zone_stat_thresholds(void);
282 int vmstat_refresh(struct ctl_table *, int write,
283 void __user *buffer, size_t *lenp, loff_t *ppos);
285 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
287 int calculate_pressure_threshold(struct zone *zone);
288 int calculate_normal_threshold(struct zone *zone);
289 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
290 int (*calculate_pressure)(struct zone *));
291 #else /* CONFIG_SMP */
294 * We do not maintain differentials in a single processor configuration.
295 * The functions directly modify the zone and global counters.
297 static inline void __mod_zone_page_state(struct zone *zone,
298 enum zone_stat_item item, long delta)
300 zone_page_state_add(delta, zone, item);
303 static inline void __mod_node_page_state(struct pglist_data *pgdat,
304 enum node_stat_item item, int delta)
306 node_page_state_add(delta, pgdat, item);
309 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
311 atomic_long_inc(&zone->vm_stat[item]);
312 atomic_long_inc(&vm_zone_stat[item]);
315 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
317 atomic_long_inc(&pgdat->vm_stat[item]);
318 atomic_long_inc(&vm_node_stat[item]);
321 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
323 atomic_long_dec(&zone->vm_stat[item]);
324 atomic_long_dec(&vm_zone_stat[item]);
327 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
329 atomic_long_dec(&pgdat->vm_stat[item]);
330 atomic_long_dec(&vm_node_stat[item]);
333 static inline void __inc_zone_page_state(struct page *page,
334 enum zone_stat_item item)
336 __inc_zone_state(page_zone(page), item);
339 static inline void __inc_node_page_state(struct page *page,
340 enum node_stat_item item)
342 __inc_node_state(page_pgdat(page), item);
346 static inline void __dec_zone_page_state(struct page *page,
347 enum zone_stat_item item)
349 __dec_zone_state(page_zone(page), item);
352 static inline void __dec_node_page_state(struct page *page,
353 enum node_stat_item item)
355 __dec_node_state(page_pgdat(page), item);
360 * We only use atomic operations to update counters. So there is no need to
361 * disable interrupts.
363 #define inc_zone_page_state __inc_zone_page_state
364 #define dec_zone_page_state __dec_zone_page_state
365 #define mod_zone_page_state __mod_zone_page_state
367 #define inc_node_page_state __inc_node_page_state
368 #define dec_node_page_state __dec_node_page_state
369 #define mod_node_page_state __mod_node_page_state
371 #define inc_zone_state __inc_zone_state
372 #define inc_node_state __inc_node_state
373 #define dec_zone_state __dec_zone_state
375 #define set_pgdat_percpu_threshold(pgdat, callback) { }
377 static inline void refresh_zone_stat_thresholds(void) { }
378 static inline void cpu_vm_stats_fold(int cpu) { }
379 static inline void quiet_vmstat(void) { }
381 static inline void drain_zonestat(struct zone *zone,
382 struct per_cpu_pageset *pset) { }
383 #endif /* CONFIG_SMP */
385 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
388 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
389 if (is_migrate_cma(migratetype))
390 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
393 extern const char * const vmstat_text[];
395 #endif /* _LINUX_VMSTAT_H */