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 #define __count_zone_vm_events(item, zone, delta) \
84 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
85 zone_idx(zone), delta)
88 * Zone based page accounting with per cpu differentials.
90 extern atomic_long_t vm_stat
[NR_VM_ZONE_STAT_ITEMS
];
92 static inline void zone_page_state_add(long x
, struct zone
*zone
,
93 enum zone_stat_item item
)
95 atomic_long_add(x
, &zone
->vm_stat
[item
]);
96 atomic_long_add(x
, &vm_stat
[item
]);
99 static inline unsigned long global_page_state(enum zone_stat_item item
)
101 long x
= atomic_long_read(&vm_stat
[item
]);
109 static inline unsigned long zone_page_state(struct zone
*zone
,
110 enum zone_stat_item item
)
112 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
121 * More accurate version that also considers the currently pending
122 * deltas. For that we need to loop over all cpus to find the current
123 * deltas. There is no synchronization so the result cannot be
124 * exactly accurate either.
126 static inline unsigned long zone_page_state_snapshot(struct zone
*zone
,
127 enum zone_stat_item item
)
129 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
133 for_each_online_cpu(cpu
)
134 x
+= per_cpu_ptr(zone
->pageset
, cpu
)->vm_stat_diff
[item
];
142 extern unsigned long global_reclaimable_pages(void);
143 extern unsigned long zone_reclaimable_pages(struct zone
*zone
);
147 * Determine the per node value of a stat item. This function
148 * is called frequently in a NUMA machine, so try to be as
149 * frugal as possible.
151 static inline unsigned long node_page_state(int node
,
152 enum zone_stat_item item
)
154 struct zone
*zones
= NODE_DATA(node
)->node_zones
;
157 #ifdef CONFIG_ZONE_DMA
158 zone_page_state(&zones
[ZONE_DMA
], item
) +
160 #ifdef CONFIG_ZONE_DMA32
161 zone_page_state(&zones
[ZONE_DMA32
], item
) +
163 #ifdef CONFIG_HIGHMEM
164 zone_page_state(&zones
[ZONE_HIGHMEM
], item
) +
166 zone_page_state(&zones
[ZONE_NORMAL
], item
) +
167 zone_page_state(&zones
[ZONE_MOVABLE
], item
);
170 extern void zone_statistics(struct zone
*, struct zone
*, gfp_t gfp
);
174 #define node_page_state(node, item) global_page_state(item)
175 #define zone_statistics(_zl, _z, gfp) do { } while (0)
177 #endif /* CONFIG_NUMA */
179 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
180 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
182 static inline void zap_zone_vm_stats(struct zone
*zone
)
184 memset(zone
->vm_stat
, 0, sizeof(zone
->vm_stat
));
187 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
190 void __mod_zone_page_state(struct zone
*, enum zone_stat_item item
, int);
191 void __inc_zone_page_state(struct page
*, enum zone_stat_item
);
192 void __dec_zone_page_state(struct page
*, enum zone_stat_item
);
194 void mod_zone_page_state(struct zone
*, enum zone_stat_item
, int);
195 void inc_zone_page_state(struct page
*, enum zone_stat_item
);
196 void dec_zone_page_state(struct page
*, enum zone_stat_item
);
198 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
199 extern void __inc_zone_state(struct zone
*, enum zone_stat_item
);
200 extern void dec_zone_state(struct zone
*, enum zone_stat_item
);
201 extern void __dec_zone_state(struct zone
*, enum zone_stat_item
);
203 void refresh_cpu_vm_stats(int);
204 void refresh_zone_stat_thresholds(void);
206 int calculate_pressure_threshold(struct zone
*zone
);
207 int calculate_normal_threshold(struct zone
*zone
);
208 void set_pgdat_percpu_threshold(pg_data_t
*pgdat
,
209 int (*calculate_pressure
)(struct zone
*));
210 #else /* CONFIG_SMP */
213 * We do not maintain differentials in a single processor configuration.
214 * The functions directly modify the zone and global counters.
216 static inline void __mod_zone_page_state(struct zone
*zone
,
217 enum zone_stat_item item
, int delta
)
219 zone_page_state_add(delta
, zone
, item
);
222 static inline void __inc_zone_state(struct zone
*zone
, enum zone_stat_item item
)
224 atomic_long_inc(&zone
->vm_stat
[item
]);
225 atomic_long_inc(&vm_stat
[item
]);
228 static inline void __inc_zone_page_state(struct page
*page
,
229 enum zone_stat_item item
)
231 __inc_zone_state(page_zone(page
), item
);
234 static inline void __dec_zone_state(struct zone
*zone
, enum zone_stat_item item
)
236 atomic_long_dec(&zone
->vm_stat
[item
]);
237 atomic_long_dec(&vm_stat
[item
]);
240 static inline void __dec_zone_page_state(struct page
*page
,
241 enum zone_stat_item item
)
243 __dec_zone_state(page_zone(page
), item
);
247 * We only use atomic operations to update counters. So there is no need to
248 * disable interrupts.
250 #define inc_zone_page_state __inc_zone_page_state
251 #define dec_zone_page_state __dec_zone_page_state
252 #define mod_zone_page_state __mod_zone_page_state
254 #define set_pgdat_percpu_threshold(pgdat, callback) { }
256 static inline void refresh_cpu_vm_stats(int cpu
) { }
257 static inline void refresh_zone_stat_thresholds(void) { }
259 #endif /* CONFIG_SMP */
261 extern const char * const vmstat_text
[];
263 #endif /* _LINUX_VMSTAT_H */
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