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);
25 unsigned nr_unqueued_dirty;
26 unsigned nr_congested;
27 unsigned nr_writeback;
28 unsigned nr_immediate;
29 unsigned nr_activate[2];
31 unsigned nr_unmap_fail;
34 enum writeback_stat_item {
36 NR_DIRTY_BG_THRESHOLD,
37 NR_VM_WRITEBACK_STAT_ITEMS,
40 #ifdef CONFIG_VM_EVENT_COUNTERS
42 * Light weight per cpu counter implementation.
44 * Counters should only be incremented and no critical kernel component
45 * should rely on the counter values.
47 * Counters are handled completely inline. On many platforms the code
48 * generated will simply be the increment of a global address.
51 struct vm_event_state {
52 unsigned long event[NR_VM_EVENT_ITEMS];
55 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
58 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
59 * local_irq_disable overhead.
61 static inline void __count_vm_event(enum vm_event_item item)
63 raw_cpu_inc(vm_event_states.event[item]);
66 static inline void count_vm_event(enum vm_event_item item)
68 this_cpu_inc(vm_event_states.event[item]);
71 static inline void __count_vm_events(enum vm_event_item item, long delta)
73 raw_cpu_add(vm_event_states.event[item], delta);
76 static inline void count_vm_events(enum vm_event_item item, long delta)
78 this_cpu_add(vm_event_states.event[item], delta);
81 extern void all_vm_events(unsigned long *);
83 extern void vm_events_fold_cpu(int cpu);
87 /* Disable counters */
88 static inline void count_vm_event(enum vm_event_item item)
91 static inline void count_vm_events(enum vm_event_item item, long delta)
94 static inline void __count_vm_event(enum vm_event_item item)
97 static inline void __count_vm_events(enum vm_event_item item, long delta)
100 static inline void all_vm_events(unsigned long *ret)
103 static inline void vm_events_fold_cpu(int cpu)
107 #endif /* CONFIG_VM_EVENT_COUNTERS */
109 #ifdef CONFIG_NUMA_BALANCING
110 #define count_vm_numa_event(x) count_vm_event(x)
111 #define count_vm_numa_events(x, y) count_vm_events(x, y)
113 #define count_vm_numa_event(x) do {} while (0)
114 #define count_vm_numa_events(x, y) do { (void)(y); } while (0)
115 #endif /* CONFIG_NUMA_BALANCING */
117 #ifdef CONFIG_DEBUG_TLBFLUSH
118 #define count_vm_tlb_event(x) count_vm_event(x)
119 #define count_vm_tlb_events(x, y) count_vm_events(x, y)
121 #define count_vm_tlb_event(x) do {} while (0)
122 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
125 #ifdef CONFIG_DEBUG_VM_VMACACHE
126 #define count_vm_vmacache_event(x) count_vm_event(x)
128 #define count_vm_vmacache_event(x) do {} while (0)
131 #define __count_zid_vm_events(item, zid, delta) \
132 __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
135 * Zone and node-based page accounting with per cpu differentials.
137 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
138 extern atomic_long_t vm_numa_stat[NR_VM_NUMA_STAT_ITEMS];
139 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
142 static inline void zone_numa_state_add(long x, struct zone *zone,
143 enum numa_stat_item item)
145 atomic_long_add(x, &zone->vm_numa_stat[item]);
146 atomic_long_add(x, &vm_numa_stat[item]);
149 static inline unsigned long global_numa_state(enum numa_stat_item item)
151 long x = atomic_long_read(&vm_numa_stat[item]);
156 static inline unsigned long zone_numa_state_snapshot(struct zone *zone,
157 enum numa_stat_item item)
159 long x = atomic_long_read(&zone->vm_numa_stat[item]);
162 for_each_online_cpu(cpu)
163 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item];
167 #endif /* CONFIG_NUMA */
169 static inline void zone_page_state_add(long x, struct zone *zone,
170 enum zone_stat_item item)
172 atomic_long_add(x, &zone->vm_stat[item]);
173 atomic_long_add(x, &vm_zone_stat[item]);
176 static inline void node_page_state_add(long x, struct pglist_data *pgdat,
177 enum node_stat_item item)
179 atomic_long_add(x, &pgdat->vm_stat[item]);
180 atomic_long_add(x, &vm_node_stat[item]);
183 static inline unsigned long global_zone_page_state(enum zone_stat_item item)
185 long x = atomic_long_read(&vm_zone_stat[item]);
193 static inline unsigned long global_node_page_state(enum node_stat_item item)
195 long x = atomic_long_read(&vm_node_stat[item]);
203 static inline unsigned long zone_page_state(struct zone *zone,
204 enum zone_stat_item item)
206 long x = atomic_long_read(&zone->vm_stat[item]);
215 * More accurate version that also considers the currently pending
216 * deltas. For that we need to loop over all cpus to find the current
217 * deltas. There is no synchronization so the result cannot be
218 * exactly accurate either.
220 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
221 enum zone_stat_item item)
223 long x = atomic_long_read(&zone->vm_stat[item]);
227 for_each_online_cpu(cpu)
228 x += per_cpu_ptr(zone->pageset, cpu)->vm_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 */
249 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
250 void __inc_zone_page_state(struct page *, enum zone_stat_item);
251 void __dec_zone_page_state(struct page *, enum zone_stat_item);
253 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
254 void __inc_node_page_state(struct page *, enum node_stat_item);
255 void __dec_node_page_state(struct page *, enum node_stat_item);
257 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
258 void inc_zone_page_state(struct page *, enum zone_stat_item);
259 void dec_zone_page_state(struct page *, enum zone_stat_item);
261 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
262 void inc_node_page_state(struct page *, enum node_stat_item);
263 void dec_node_page_state(struct page *, enum node_stat_item);
265 extern void inc_node_state(struct pglist_data *, enum node_stat_item);
266 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
267 extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
268 extern void dec_zone_state(struct zone *, enum zone_stat_item);
269 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
270 extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
272 void quiet_vmstat(void);
273 void cpu_vm_stats_fold(int cpu);
274 void refresh_zone_stat_thresholds(void);
277 int vmstat_refresh(struct ctl_table *, int write,
278 void __user *buffer, size_t *lenp, loff_t *ppos);
280 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
282 int calculate_pressure_threshold(struct zone *zone);
283 int calculate_normal_threshold(struct zone *zone);
284 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
285 int (*calculate_pressure)(struct zone *));
286 #else /* CONFIG_SMP */
289 * We do not maintain differentials in a single processor configuration.
290 * The functions directly modify the zone and global counters.
292 static inline void __mod_zone_page_state(struct zone *zone,
293 enum zone_stat_item item, long delta)
295 zone_page_state_add(delta, zone, item);
298 static inline void __mod_node_page_state(struct pglist_data *pgdat,
299 enum node_stat_item item, int delta)
301 node_page_state_add(delta, pgdat, item);
304 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
306 atomic_long_inc(&zone->vm_stat[item]);
307 atomic_long_inc(&vm_zone_stat[item]);
310 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
312 atomic_long_inc(&pgdat->vm_stat[item]);
313 atomic_long_inc(&vm_node_stat[item]);
316 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
318 atomic_long_dec(&zone->vm_stat[item]);
319 atomic_long_dec(&vm_zone_stat[item]);
322 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
324 atomic_long_dec(&pgdat->vm_stat[item]);
325 atomic_long_dec(&vm_node_stat[item]);
328 static inline void __inc_zone_page_state(struct page *page,
329 enum zone_stat_item item)
331 __inc_zone_state(page_zone(page), item);
334 static inline void __inc_node_page_state(struct page *page,
335 enum node_stat_item item)
337 __inc_node_state(page_pgdat(page), item);
341 static inline void __dec_zone_page_state(struct page *page,
342 enum zone_stat_item item)
344 __dec_zone_state(page_zone(page), item);
347 static inline void __dec_node_page_state(struct page *page,
348 enum node_stat_item item)
350 __dec_node_state(page_pgdat(page), item);
355 * We only use atomic operations to update counters. So there is no need to
356 * disable interrupts.
358 #define inc_zone_page_state __inc_zone_page_state
359 #define dec_zone_page_state __dec_zone_page_state
360 #define mod_zone_page_state __mod_zone_page_state
362 #define inc_node_page_state __inc_node_page_state
363 #define dec_node_page_state __dec_node_page_state
364 #define mod_node_page_state __mod_node_page_state
366 #define inc_zone_state __inc_zone_state
367 #define inc_node_state __inc_node_state
368 #define dec_zone_state __dec_zone_state
370 #define set_pgdat_percpu_threshold(pgdat, callback) { }
372 static inline void refresh_zone_stat_thresholds(void) { }
373 static inline void cpu_vm_stats_fold(int cpu) { }
374 static inline void quiet_vmstat(void) { }
376 static inline void drain_zonestat(struct zone *zone,
377 struct per_cpu_pageset *pset) { }
378 #endif /* CONFIG_SMP */
380 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
383 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
384 if (is_migrate_cma(migratetype))
385 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
388 extern const char * const vmstat_text[];
390 static inline const char *zone_stat_name(enum zone_stat_item item)
392 return vmstat_text[item];
396 static inline const char *numa_stat_name(enum numa_stat_item item)
398 return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
401 #endif /* CONFIG_NUMA */
403 static inline const char *node_stat_name(enum node_stat_item item)
405 return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
406 NR_VM_NUMA_STAT_ITEMS +
410 static inline const char *lru_list_name(enum lru_list lru)
412 return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
415 static inline const char *writeback_stat_name(enum writeback_stat_item item)
417 return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
418 NR_VM_NUMA_STAT_ITEMS +
419 NR_VM_NODE_STAT_ITEMS +
423 #if defined(CONFIG_VM_EVENT_COUNTERS) || defined(CONFIG_MEMCG)
424 static inline const char *vm_event_name(enum vm_event_item item)
426 return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
427 NR_VM_NUMA_STAT_ITEMS +
428 NR_VM_NODE_STAT_ITEMS +
429 NR_VM_WRITEBACK_STAT_ITEMS +
432 #endif /* CONFIG_VM_EVENT_COUNTERS || CONFIG_MEMCG */
434 #endif /* _LINUX_VMSTAT_H */