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 based page accounting with per cpu differentials.
111 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
113 static inline void zone_page_state_add(long x, struct zone *zone,
114 enum zone_stat_item item)
116 atomic_long_add(x, &zone->vm_stat[item]);
117 atomic_long_add(x, &vm_stat[item]);
120 static inline unsigned long global_page_state(enum zone_stat_item item)
122 long x = atomic_long_read(&vm_stat[item]);
130 static inline unsigned long zone_page_state(struct zone *zone,
131 enum zone_stat_item item)
133 long x = atomic_long_read(&zone->vm_stat[item]);
142 * More accurate version that also considers the currently pending
143 * deltas. For that we need to loop over all cpus to find the current
144 * deltas. There is no synchronization so the result cannot be
145 * exactly accurate either.
147 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
148 enum zone_stat_item item)
150 long x = atomic_long_read(&zone->vm_stat[item]);
154 for_each_online_cpu(cpu)
155 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
165 extern unsigned long node_page_state(int node, enum zone_stat_item item);
166 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
170 #define node_page_state(node, item) global_page_state(item)
171 #define zone_statistics(_zl, _z, gfp) do { } while (0)
173 #endif /* CONFIG_NUMA */
175 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
176 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
179 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
180 void __inc_zone_page_state(struct page *, enum zone_stat_item);
181 void __dec_zone_page_state(struct page *, enum zone_stat_item);
183 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
184 void inc_zone_page_state(struct page *, enum zone_stat_item);
185 void dec_zone_page_state(struct page *, enum zone_stat_item);
187 extern void inc_zone_state(struct zone *, enum zone_stat_item);
188 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
189 extern void dec_zone_state(struct zone *, enum zone_stat_item);
190 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
192 void cpu_vm_stats_fold(int cpu);
193 void refresh_zone_stat_thresholds(void);
195 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
197 int calculate_pressure_threshold(struct zone *zone);
198 int calculate_normal_threshold(struct zone *zone);
199 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
200 int (*calculate_pressure)(struct zone *));
201 #else /* CONFIG_SMP */
204 * We do not maintain differentials in a single processor configuration.
205 * The functions directly modify the zone and global counters.
207 static inline void __mod_zone_page_state(struct zone *zone,
208 enum zone_stat_item item, long delta)
210 zone_page_state_add(delta, zone, item);
213 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
215 atomic_long_inc(&zone->vm_stat[item]);
216 atomic_long_inc(&vm_stat[item]);
219 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
221 atomic_long_dec(&zone->vm_stat[item]);
222 atomic_long_dec(&vm_stat[item]);
225 static inline void __inc_zone_page_state(struct page *page,
226 enum zone_stat_item item)
228 __inc_zone_state(page_zone(page), item);
231 static inline void __dec_zone_page_state(struct page *page,
232 enum zone_stat_item item)
234 __dec_zone_state(page_zone(page), item);
238 * We only use atomic operations to update counters. So there is no need to
239 * disable interrupts.
241 #define inc_zone_page_state __inc_zone_page_state
242 #define dec_zone_page_state __dec_zone_page_state
243 #define mod_zone_page_state __mod_zone_page_state
245 #define inc_zone_state __inc_zone_state
246 #define dec_zone_state __dec_zone_state
248 #define set_pgdat_percpu_threshold(pgdat, callback) { }
250 static inline void refresh_zone_stat_thresholds(void) { }
251 static inline void cpu_vm_stats_fold(int cpu) { }
253 static inline void drain_zonestat(struct zone *zone,
254 struct per_cpu_pageset *pset) { }
255 #endif /* CONFIG_SMP */
257 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
260 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
261 if (is_migrate_cma(migratetype))
262 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
265 extern const char * const vmstat_text[];
267 #endif /* _LINUX_VMSTAT_H */