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 <asm/atomic.h>
10 #ifdef CONFIG_ZONE_DMA
11 #define DMA_ZONE(xx) xx##_DMA,
16 #ifdef CONFIG_ZONE_DMA32
17 #define DMA32_ZONE(xx) xx##_DMA32,
19 #define DMA32_ZONE(xx)
23 #define HIGHMEM_ZONE(xx) , xx##_HIGH
25 #define HIGHMEM_ZONE(xx)
29 #define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE
31 enum vm_event_item
{ PGPGIN
, PGPGOUT
, PSWPIN
, PSWPOUT
,
32 FOR_ALL_ZONES(PGALLOC
),
33 PGFREE
, PGACTIVATE
, PGDEACTIVATE
,
35 FOR_ALL_ZONES(PGREFILL
),
36 FOR_ALL_ZONES(PGSTEAL
),
37 FOR_ALL_ZONES(PGSCAN_KSWAPD
),
38 FOR_ALL_ZONES(PGSCAN_DIRECT
),
40 PGSCAN_ZONE_RECLAIM_FAILED
,
42 PGINODESTEAL
, SLABS_SCANNED
, KSWAPD_STEAL
, KSWAPD_INODESTEAL
,
43 KSWAPD_LOW_WMARK_HIT_QUICKLY
, KSWAPD_HIGH_WMARK_HIT_QUICKLY
,
44 KSWAPD_SKIP_CONGESTION_WAIT
,
45 PAGEOUTRUN
, ALLOCSTALL
, PGROTATED
,
46 #ifdef CONFIG_COMPACTION
47 COMPACTBLOCKS
, COMPACTPAGES
, COMPACTPAGEFAILED
,
48 COMPACTSTALL
, COMPACTFAIL
, COMPACTSUCCESS
,
50 #ifdef CONFIG_HUGETLB_PAGE
51 HTLB_BUDDY_PGALLOC
, HTLB_BUDDY_PGALLOC_FAIL
,
53 UNEVICTABLE_PGCULLED
, /* culled to noreclaim list */
54 UNEVICTABLE_PGSCANNED
, /* scanned for reclaimability */
55 UNEVICTABLE_PGRESCUED
, /* rescued from noreclaim list */
56 UNEVICTABLE_PGMLOCKED
,
57 UNEVICTABLE_PGMUNLOCKED
,
58 UNEVICTABLE_PGCLEARED
, /* on COW, page truncate */
59 UNEVICTABLE_PGSTRANDED
, /* unable to isolate on unlock */
60 UNEVICTABLE_MLOCKFREED
,
61 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
65 THP_COLLAPSE_ALLOC_FAILED
,
71 extern int sysctl_stat_interval
;
73 #ifdef CONFIG_VM_EVENT_COUNTERS
75 * Light weight per cpu counter implementation.
77 * Counters should only be incremented and no critical kernel component
78 * should rely on the counter values.
80 * Counters are handled completely inline. On many platforms the code
81 * generated will simply be the increment of a global address.
84 struct vm_event_state
{
85 unsigned long event
[NR_VM_EVENT_ITEMS
];
88 DECLARE_PER_CPU(struct vm_event_state
, vm_event_states
);
90 static inline void __count_vm_event(enum vm_event_item item
)
92 __this_cpu_inc(vm_event_states
.event
[item
]);
95 static inline void count_vm_event(enum vm_event_item item
)
97 this_cpu_inc(vm_event_states
.event
[item
]);
100 static inline void __count_vm_events(enum vm_event_item item
, long delta
)
102 __this_cpu_add(vm_event_states
.event
[item
], delta
);
105 static inline void count_vm_events(enum vm_event_item item
, long delta
)
107 this_cpu_add(vm_event_states
.event
[item
], delta
);
110 extern void all_vm_events(unsigned long *);
111 #ifdef CONFIG_HOTPLUG
112 extern void vm_events_fold_cpu(int cpu
);
114 static inline void vm_events_fold_cpu(int cpu
)
121 /* Disable counters */
122 static inline void count_vm_event(enum vm_event_item item
)
125 static inline void count_vm_events(enum vm_event_item item
, long delta
)
128 static inline void __count_vm_event(enum vm_event_item item
)
131 static inline void __count_vm_events(enum vm_event_item item
, long delta
)
134 static inline void all_vm_events(unsigned long *ret
)
137 static inline void vm_events_fold_cpu(int cpu
)
141 #endif /* CONFIG_VM_EVENT_COUNTERS */
143 #define __count_zone_vm_events(item, zone, delta) \
144 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
145 zone_idx(zone), delta)
148 * Zone based page accounting with per cpu differentials.
150 extern atomic_long_t vm_stat
[NR_VM_ZONE_STAT_ITEMS
];
152 static inline void zone_page_state_add(long x
, struct zone
*zone
,
153 enum zone_stat_item item
)
155 atomic_long_add(x
, &zone
->vm_stat
[item
]);
156 atomic_long_add(x
, &vm_stat
[item
]);
159 static inline unsigned long global_page_state(enum zone_stat_item item
)
161 long x
= atomic_long_read(&vm_stat
[item
]);
169 static inline unsigned long zone_page_state(struct zone
*zone
,
170 enum zone_stat_item item
)
172 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
181 * More accurate version that also considers the currently pending
182 * deltas. For that we need to loop over all cpus to find the current
183 * deltas. There is no synchronization so the result cannot be
184 * exactly accurate either.
186 static inline unsigned long zone_page_state_snapshot(struct zone
*zone
,
187 enum zone_stat_item item
)
189 long x
= atomic_long_read(&zone
->vm_stat
[item
]);
193 for_each_online_cpu(cpu
)
194 x
+= per_cpu_ptr(zone
->pageset
, cpu
)->vm_stat_diff
[item
];
202 extern unsigned long global_reclaimable_pages(void);
203 extern unsigned long zone_reclaimable_pages(struct zone
*zone
);
207 * Determine the per node value of a stat item. This function
208 * is called frequently in a NUMA machine, so try to be as
209 * frugal as possible.
211 static inline unsigned long node_page_state(int node
,
212 enum zone_stat_item item
)
214 struct zone
*zones
= NODE_DATA(node
)->node_zones
;
217 #ifdef CONFIG_ZONE_DMA
218 zone_page_state(&zones
[ZONE_DMA
], item
) +
220 #ifdef CONFIG_ZONE_DMA32
221 zone_page_state(&zones
[ZONE_DMA32
], item
) +
223 #ifdef CONFIG_HIGHMEM
224 zone_page_state(&zones
[ZONE_HIGHMEM
], item
) +
226 zone_page_state(&zones
[ZONE_NORMAL
], item
) +
227 zone_page_state(&zones
[ZONE_MOVABLE
], item
);
230 extern void zone_statistics(struct zone
*, struct zone
*, gfp_t gfp
);
234 #define node_page_state(node, item) global_page_state(item)
235 #define zone_statistics(_zl, _z, gfp) do { } while (0)
237 #endif /* CONFIG_NUMA */
239 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
240 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
242 static inline void zap_zone_vm_stats(struct zone
*zone
)
244 memset(zone
->vm_stat
, 0, sizeof(zone
->vm_stat
));
247 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
250 void __mod_zone_page_state(struct zone
*, enum zone_stat_item item
, int);
251 void __inc_zone_page_state(struct page
*, enum zone_stat_item
);
252 void __dec_zone_page_state(struct page
*, enum zone_stat_item
);
254 void mod_zone_page_state(struct zone
*, enum zone_stat_item
, int);
255 void inc_zone_page_state(struct page
*, enum zone_stat_item
);
256 void dec_zone_page_state(struct page
*, enum zone_stat_item
);
258 extern void inc_zone_state(struct zone
*, enum zone_stat_item
);
259 extern void __inc_zone_state(struct zone
*, enum zone_stat_item
);
260 extern void dec_zone_state(struct zone
*, enum zone_stat_item
);
261 extern void __dec_zone_state(struct zone
*, enum zone_stat_item
);
263 void refresh_cpu_vm_stats(int);
265 int calculate_pressure_threshold(struct zone
*zone
);
266 int calculate_normal_threshold(struct zone
*zone
);
267 void set_pgdat_percpu_threshold(pg_data_t
*pgdat
,
268 int (*calculate_pressure
)(struct zone
*));
269 #else /* CONFIG_SMP */
272 * We do not maintain differentials in a single processor configuration.
273 * The functions directly modify the zone and global counters.
275 static inline void __mod_zone_page_state(struct zone
*zone
,
276 enum zone_stat_item item
, int delta
)
278 zone_page_state_add(delta
, zone
, item
);
281 static inline void __inc_zone_state(struct zone
*zone
, enum zone_stat_item item
)
283 atomic_long_inc(&zone
->vm_stat
[item
]);
284 atomic_long_inc(&vm_stat
[item
]);
287 static inline void __inc_zone_page_state(struct page
*page
,
288 enum zone_stat_item item
)
290 __inc_zone_state(page_zone(page
), item
);
293 static inline void __dec_zone_state(struct zone
*zone
, enum zone_stat_item item
)
295 atomic_long_dec(&zone
->vm_stat
[item
]);
296 atomic_long_dec(&vm_stat
[item
]);
299 static inline void __dec_zone_page_state(struct page
*page
,
300 enum zone_stat_item item
)
302 __dec_zone_state(page_zone(page
), item
);
306 * We only use atomic operations to update counters. So there is no need to
307 * disable interrupts.
309 #define inc_zone_page_state __inc_zone_page_state
310 #define dec_zone_page_state __dec_zone_page_state
311 #define mod_zone_page_state __mod_zone_page_state
313 #define set_pgdat_percpu_threshold(pgdat, callback) { }
315 static inline void refresh_cpu_vm_stats(int cpu
) { }
318 #endif /* _LINUX_VMSTAT_H */