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
);
30 static inline void __count_vm_event(enum vm_event_item item
)
32 __this_cpu_inc(vm_event_states
.event
[item
]);
35 static inline void count_vm_event(enum vm_event_item item
)
37 this_cpu_inc(vm_event_states
.event
[item
]);
40 static inline void __count_vm_events(enum vm_event_item item
, long delta
)
42 __this_cpu_add(vm_event_states
.event
[item
], delta
);
45 static inline void count_vm_events(enum vm_event_item item
, long delta
)
47 this_cpu_add(vm_event_states
.event
[item
], delta
);
50 extern void all_vm_events(unsigned long *);
52 extern void vm_events_fold_cpu(int cpu
);
54 static inline void vm_events_fold_cpu(int cpu
)
61 /* Disable counters */
62 static inline void count_vm_event(enum vm_event_item item
)
65 static inline void count_vm_events(enum vm_event_item item
, long delta
)
68 static inline void __count_vm_event(enum vm_event_item item
)
71 static inline void __count_vm_events(enum vm_event_item item
, long delta
)
74 static inline void all_vm_events(unsigned long *ret
)
77 static inline void vm_events_fold_cpu(int cpu
)
81 #endif /* CONFIG_VM_EVENT_COUNTERS */
83 #ifdef CONFIG_NUMA_BALANCING
84 #define count_vm_numa_event(x) count_vm_event(x)
85 #define count_vm_numa_events(x, y) count_vm_events(x, y)
87 #define count_vm_numa_event(x) do {} while (0)
88 #define count_vm_numa_events(x, y) do {} while (0)
89 #endif /* CONFIG_NUMA_BALANCING */
91 #define __count_zone_vm_events(item, zone, delta) \
92 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
93 zone_idx(zone), delta)
96 * Zone based page accounting with per cpu differentials.
98 extern atomic_long_t vm_stat
[NR_VM_ZONE_STAT_ITEMS
];
100 static inline void zone_page_state_add(long x
, struct zone
*zone
,
101 enum zone_stat_item item
)
103 atomic_long_add(x
, &zone
->vm_stat
[item
]);
104 atomic_long_add(x
, &vm_stat
[item
]);
107 static inline unsigned long global_page_state(enum zone_stat_item item
)
109 long x
= atomic_long_read(&vm_stat
[item
]);
117 static inline unsigned long zone_page_state(struct zone
*zone
,
118 enum zone_stat_item item
)
120 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
129 * More accurate version that also considers the currently pending
130 * deltas. For that we need to loop over all cpus to find the current
131 * deltas. There is no synchronization so the result cannot be
132 * exactly accurate either.
134 static inline unsigned long zone_page_state_snapshot(struct zone
*zone
,
135 enum zone_stat_item item
)
137 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
141 for_each_online_cpu(cpu
)
142 x
+= per_cpu_ptr(zone
->pageset
, cpu
)->vm_stat_diff
[item
];
150 extern unsigned long global_reclaimable_pages(void);
151 extern unsigned long zone_reclaimable_pages(struct zone
*zone
);
155 * Determine the per node value of a stat item. This function
156 * is called frequently in a NUMA machine, so try to be as
157 * frugal as possible.
159 static inline unsigned long node_page_state(int node
,
160 enum zone_stat_item item
)
162 struct zone
*zones
= NODE_DATA(node
)->node_zones
;
165 #ifdef CONFIG_ZONE_DMA
166 zone_page_state(&zones
[ZONE_DMA
], item
) +
168 #ifdef CONFIG_ZONE_DMA32
169 zone_page_state(&zones
[ZONE_DMA32
], item
) +
171 #ifdef CONFIG_HIGHMEM
172 zone_page_state(&zones
[ZONE_HIGHMEM
], item
) +
174 zone_page_state(&zones
[ZONE_NORMAL
], item
) +
175 zone_page_state(&zones
[ZONE_MOVABLE
], item
);
178 extern void zone_statistics(struct zone
*, struct zone
*, gfp_t gfp
);
182 #define node_page_state(node, item) global_page_state(item)
183 #define zone_statistics(_zl, _z, gfp) do { } while (0)
185 #endif /* CONFIG_NUMA */
187 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
188 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
190 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
193 void __mod_zone_page_state(struct zone
*, enum zone_stat_item item
, int);
194 void __inc_zone_page_state(struct page
*, enum zone_stat_item
);
195 void __dec_zone_page_state(struct page
*, enum zone_stat_item
);
197 void mod_zone_page_state(struct zone
*, enum zone_stat_item
, int);
198 void inc_zone_page_state(struct page
*, enum zone_stat_item
);
199 void dec_zone_page_state(struct page
*, enum zone_stat_item
);
201 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
202 extern void __inc_zone_state(struct zone
*, enum zone_stat_item
);
203 extern void dec_zone_state(struct zone
*, enum zone_stat_item
);
204 extern void __dec_zone_state(struct zone
*, enum zone_stat_item
);
206 void refresh_cpu_vm_stats(int);
207 void refresh_zone_stat_thresholds(void);
209 void drain_zonestat(struct zone
*zone
, struct per_cpu_pageset
*);
211 int calculate_pressure_threshold(struct zone
*zone
);
212 int calculate_normal_threshold(struct zone
*zone
);
213 void set_pgdat_percpu_threshold(pg_data_t
*pgdat
,
214 int (*calculate_pressure
)(struct zone
*));
215 #else /* CONFIG_SMP */
218 * We do not maintain differentials in a single processor configuration.
219 * The functions directly modify the zone and global counters.
221 static inline void __mod_zone_page_state(struct zone
*zone
,
222 enum zone_stat_item item
, int delta
)
224 zone_page_state_add(delta
, zone
, item
);
227 static inline void __inc_zone_state(struct zone
*zone
, enum zone_stat_item item
)
229 atomic_long_inc(&zone
->vm_stat
[item
]);
230 atomic_long_inc(&vm_stat
[item
]);
233 static inline void __inc_zone_page_state(struct page
*page
,
234 enum zone_stat_item item
)
236 __inc_zone_state(page_zone(page
), item
);
239 static inline void __dec_zone_state(struct zone
*zone
, enum zone_stat_item item
)
241 atomic_long_dec(&zone
->vm_stat
[item
]);
242 atomic_long_dec(&vm_stat
[item
]);
245 static inline void __dec_zone_page_state(struct page
*page
,
246 enum zone_stat_item item
)
248 __dec_zone_state(page_zone(page
), item
);
252 * We only use atomic operations to update counters. So there is no need to
253 * disable interrupts.
255 #define inc_zone_page_state __inc_zone_page_state
256 #define dec_zone_page_state __dec_zone_page_state
257 #define mod_zone_page_state __mod_zone_page_state
259 #define set_pgdat_percpu_threshold(pgdat, callback) { }
261 static inline void refresh_cpu_vm_stats(int cpu
) { }
262 static inline void refresh_zone_stat_thresholds(void) { }
264 static inline void drain_zonestat(struct zone
*zone
,
265 struct per_cpu_pageset
*pset
) { }
266 #endif /* CONFIG_SMP */
268 static inline void __mod_zone_freepage_state(struct zone
*zone
, int nr_pages
,
271 __mod_zone_page_state(zone
, NR_FREE_PAGES
, nr_pages
);
272 if (is_migrate_cma(migratetype
))
273 __mod_zone_page_state(zone
, NR_FREE_CMA_PAGES
, nr_pages
);
276 extern const char * const vmstat_text
[];
278 #endif /* _LINUX_VMSTAT_H */