Linux kernel mirror (for testing)
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linux
1#ifndef _LINUX_VMSTAT_H
2#define _LINUX_VMSTAT_H
3
4#include <linux/types.h>
5#include <linux/percpu.h>
6#include <linux/mm.h>
7#include <linux/mmzone.h>
8#include <linux/vm_event_item.h>
9#include <linux/atomic.h>
10
11extern int sysctl_stat_interval;
12
13#ifdef CONFIG_VM_EVENT_COUNTERS
14/*
15 * Light weight per cpu counter implementation.
16 *
17 * Counters should only be incremented and no critical kernel component
18 * should rely on the counter values.
19 *
20 * Counters are handled completely inline. On many platforms the code
21 * generated will simply be the increment of a global address.
22 */
23
24struct vm_event_state {
25 unsigned long event[NR_VM_EVENT_ITEMS];
26};
27
28DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
29
30/*
31 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
32 * local_irq_disable overhead.
33 */
34static inline void __count_vm_event(enum vm_event_item item)
35{
36 raw_cpu_inc(vm_event_states.event[item]);
37}
38
39static inline void count_vm_event(enum vm_event_item item)
40{
41 this_cpu_inc(vm_event_states.event[item]);
42}
43
44static inline void __count_vm_events(enum vm_event_item item, long delta)
45{
46 raw_cpu_add(vm_event_states.event[item], delta);
47}
48
49static inline void count_vm_events(enum vm_event_item item, long delta)
50{
51 this_cpu_add(vm_event_states.event[item], delta);
52}
53
54extern void all_vm_events(unsigned long *);
55
56extern void vm_events_fold_cpu(int cpu);
57
58#else
59
60/* Disable counters */
61static inline void count_vm_event(enum vm_event_item item)
62{
63}
64static inline void count_vm_events(enum vm_event_item item, long delta)
65{
66}
67static inline void __count_vm_event(enum vm_event_item item)
68{
69}
70static inline void __count_vm_events(enum vm_event_item item, long delta)
71{
72}
73static inline void all_vm_events(unsigned long *ret)
74{
75}
76static inline void vm_events_fold_cpu(int cpu)
77{
78}
79
80#endif /* CONFIG_VM_EVENT_COUNTERS */
81
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)
85#else
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 */
89
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)
93#else
94#define count_vm_tlb_event(x) do {} while (0)
95#define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
96#endif
97
98#ifdef CONFIG_DEBUG_VM_VMACACHE
99#define count_vm_vmacache_event(x) count_vm_event(x)
100#else
101#define count_vm_vmacache_event(x) do {} while (0)
102#endif
103
104#define __count_zone_vm_events(item, zone, delta) \
105 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
106 zone_idx(zone), delta)
107
108/*
109 * Zone based page accounting with per cpu differentials.
110 */
111extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
112
113static inline void zone_page_state_add(long x, struct zone *zone,
114 enum zone_stat_item item)
115{
116 atomic_long_add(x, &zone->vm_stat[item]);
117 atomic_long_add(x, &vm_stat[item]);
118}
119
120static inline unsigned long global_page_state(enum zone_stat_item item)
121{
122 long x = atomic_long_read(&vm_stat[item]);
123#ifdef CONFIG_SMP
124 if (x < 0)
125 x = 0;
126#endif
127 return x;
128}
129
130static inline unsigned long zone_page_state(struct zone *zone,
131 enum zone_stat_item item)
132{
133 long x = atomic_long_read(&zone->vm_stat[item]);
134#ifdef CONFIG_SMP
135 if (x < 0)
136 x = 0;
137#endif
138 return x;
139}
140
141/*
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.
146 */
147static inline unsigned long zone_page_state_snapshot(struct zone *zone,
148 enum zone_stat_item item)
149{
150 long x = atomic_long_read(&zone->vm_stat[item]);
151
152#ifdef CONFIG_SMP
153 int cpu;
154 for_each_online_cpu(cpu)
155 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
156
157 if (x < 0)
158 x = 0;
159#endif
160 return x;
161}
162
163#ifdef CONFIG_NUMA
164
165extern unsigned long node_page_state(int node, enum zone_stat_item item);
166
167#else
168
169#define node_page_state(node, item) global_page_state(item)
170
171#endif /* CONFIG_NUMA */
172
173#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
174#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
175
176#ifdef CONFIG_SMP
177void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
178void __inc_zone_page_state(struct page *, enum zone_stat_item);
179void __dec_zone_page_state(struct page *, enum zone_stat_item);
180
181void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
182void inc_zone_page_state(struct page *, enum zone_stat_item);
183void dec_zone_page_state(struct page *, enum zone_stat_item);
184
185extern void inc_zone_state(struct zone *, enum zone_stat_item);
186extern void __inc_zone_state(struct zone *, enum zone_stat_item);
187extern void dec_zone_state(struct zone *, enum zone_stat_item);
188extern void __dec_zone_state(struct zone *, enum zone_stat_item);
189
190void quiet_vmstat(void);
191void cpu_vm_stats_fold(int cpu);
192void refresh_zone_stat_thresholds(void);
193
194struct ctl_table;
195int vmstat_refresh(struct ctl_table *, int write,
196 void __user *buffer, size_t *lenp, loff_t *ppos);
197
198void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
199
200int calculate_pressure_threshold(struct zone *zone);
201int calculate_normal_threshold(struct zone *zone);
202void set_pgdat_percpu_threshold(pg_data_t *pgdat,
203 int (*calculate_pressure)(struct zone *));
204#else /* CONFIG_SMP */
205
206/*
207 * We do not maintain differentials in a single processor configuration.
208 * The functions directly modify the zone and global counters.
209 */
210static inline void __mod_zone_page_state(struct zone *zone,
211 enum zone_stat_item item, long delta)
212{
213 zone_page_state_add(delta, zone, item);
214}
215
216static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
217{
218 atomic_long_inc(&zone->vm_stat[item]);
219 atomic_long_inc(&vm_stat[item]);
220}
221
222static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
223{
224 atomic_long_dec(&zone->vm_stat[item]);
225 atomic_long_dec(&vm_stat[item]);
226}
227
228static inline void __inc_zone_page_state(struct page *page,
229 enum zone_stat_item item)
230{
231 __inc_zone_state(page_zone(page), item);
232}
233
234static inline void __dec_zone_page_state(struct page *page,
235 enum zone_stat_item item)
236{
237 __dec_zone_state(page_zone(page), item);
238}
239
240/*
241 * We only use atomic operations to update counters. So there is no need to
242 * disable interrupts.
243 */
244#define inc_zone_page_state __inc_zone_page_state
245#define dec_zone_page_state __dec_zone_page_state
246#define mod_zone_page_state __mod_zone_page_state
247
248#define inc_zone_state __inc_zone_state
249#define dec_zone_state __dec_zone_state
250
251#define set_pgdat_percpu_threshold(pgdat, callback) { }
252
253static inline void refresh_zone_stat_thresholds(void) { }
254static inline void cpu_vm_stats_fold(int cpu) { }
255static inline void quiet_vmstat(void) { }
256
257static inline void drain_zonestat(struct zone *zone,
258 struct per_cpu_pageset *pset) { }
259#endif /* CONFIG_SMP */
260
261static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
262 int migratetype)
263{
264 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
265 if (is_migrate_cma(migratetype))
266 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
267}
268
269extern const char * const vmstat_text[];
270
271#endif /* _LINUX_VMSTAT_H */