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_PREMATURE_FAST, KSWAPD_PREMATURE_SLOW,
44 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
45 #ifdef CONFIG_HUGETLB_PAGE
46 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
48 UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
49 UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */
50 UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */
51 UNEVICTABLE_PGMLOCKED,
52 UNEVICTABLE_PGMUNLOCKED,
53 UNEVICTABLE_PGCLEARED, /* on COW, page truncate */
54 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
55 UNEVICTABLE_MLOCKFREED,
59 extern int sysctl_stat_interval;
61 #ifdef CONFIG_VM_EVENT_COUNTERS
63 * Light weight per cpu counter implementation.
65 * Counters should only be incremented and no critical kernel component
66 * should rely on the counter values.
68 * Counters are handled completely inline. On many platforms the code
69 * generated will simply be the increment of a global address.
72 struct vm_event_state {
73 unsigned long event[NR_VM_EVENT_ITEMS];
76 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
78 static inline void __count_vm_event(enum vm_event_item item)
80 __this_cpu_inc(per_cpu_var(vm_event_states).event[item]);
83 static inline void count_vm_event(enum vm_event_item item)
85 this_cpu_inc(per_cpu_var(vm_event_states).event[item]);
88 static inline void __count_vm_events(enum vm_event_item item, long delta)
90 __this_cpu_add(per_cpu_var(vm_event_states).event[item], delta);
93 static inline void count_vm_events(enum vm_event_item item, long delta)
95 this_cpu_add(per_cpu_var(vm_event_states).event[item], delta);
98 extern void all_vm_events(unsigned long *);
100 extern void vm_events_fold_cpu(int cpu);
102 static inline void vm_events_fold_cpu(int cpu)
109 /* Disable counters */
110 static inline void count_vm_event(enum vm_event_item item)
113 static inline void count_vm_events(enum vm_event_item item, long delta)
116 static inline void __count_vm_event(enum vm_event_item item)
119 static inline void __count_vm_events(enum vm_event_item item, long delta)
122 static inline void all_vm_events(unsigned long *ret)
125 static inline void vm_events_fold_cpu(int cpu)
129 #endif /* CONFIG_VM_EVENT_COUNTERS */
131 #define __count_zone_vm_events(item, zone, delta) \
132 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
133 zone_idx(zone), delta)
136 * Zone based page accounting with per cpu differentials.
138 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
140 static inline void zone_page_state_add(long x, struct zone *zone,
141 enum zone_stat_item item)
143 atomic_long_add(x, &zone->vm_stat[item]);
144 atomic_long_add(x, &vm_stat[item]);
147 static inline unsigned long global_page_state(enum zone_stat_item item)
149 long x = atomic_long_read(&vm_stat[item]);
157 static inline unsigned long zone_page_state(struct zone *zone,
158 enum zone_stat_item item)
160 long x = atomic_long_read(&zone->vm_stat[item]);
168 extern unsigned long global_reclaimable_pages(void);
169 extern unsigned long zone_reclaimable_pages(struct zone *zone);
173 * Determine the per node value of a stat item. This function
174 * is called frequently in a NUMA machine, so try to be as
175 * frugal as possible.
177 static inline unsigned long node_page_state(int node,
178 enum zone_stat_item item)
180 struct zone *zones = NODE_DATA(node)->node_zones;
183 #ifdef CONFIG_ZONE_DMA
184 zone_page_state(&zones[ZONE_DMA], item) +
186 #ifdef CONFIG_ZONE_DMA32
187 zone_page_state(&zones[ZONE_DMA32], item) +
189 #ifdef CONFIG_HIGHMEM
190 zone_page_state(&zones[ZONE_HIGHMEM], item) +
192 zone_page_state(&zones[ZONE_NORMAL], item) +
193 zone_page_state(&zones[ZONE_MOVABLE], item);
196 extern void zone_statistics(struct zone *, struct zone *);
200 #define node_page_state(node, item) global_page_state(item)
201 #define zone_statistics(_zl,_z) do { } while (0)
203 #endif /* CONFIG_NUMA */
205 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
206 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
208 static inline void zap_zone_vm_stats(struct zone *zone)
210 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
213 extern void inc_zone_state(struct zone *, enum zone_stat_item);
216 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
217 void __inc_zone_page_state(struct page *, enum zone_stat_item);
218 void __dec_zone_page_state(struct page *, enum zone_stat_item);
220 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
221 void inc_zone_page_state(struct page *, enum zone_stat_item);
222 void dec_zone_page_state(struct page *, enum zone_stat_item);
224 extern void inc_zone_state(struct zone *, enum zone_stat_item);
225 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
226 extern void dec_zone_state(struct zone *, enum zone_stat_item);
227 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
229 void refresh_cpu_vm_stats(int);
230 #else /* CONFIG_SMP */
233 * We do not maintain differentials in a single processor configuration.
234 * The functions directly modify the zone and global counters.
236 static inline void __mod_zone_page_state(struct zone *zone,
237 enum zone_stat_item item, int delta)
239 zone_page_state_add(delta, zone, item);
242 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
244 atomic_long_inc(&zone->vm_stat[item]);
245 atomic_long_inc(&vm_stat[item]);
248 static inline void __inc_zone_page_state(struct page *page,
249 enum zone_stat_item item)
251 __inc_zone_state(page_zone(page), item);
254 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
256 atomic_long_dec(&zone->vm_stat[item]);
257 atomic_long_dec(&vm_stat[item]);
260 static inline void __dec_zone_page_state(struct page *page,
261 enum zone_stat_item item)
263 __dec_zone_state(page_zone(page), item);
267 * We only use atomic operations to update counters. So there is no need to
268 * disable interrupts.
270 #define inc_zone_page_state __inc_zone_page_state
271 #define dec_zone_page_state __dec_zone_page_state
272 #define mod_zone_page_state __mod_zone_page_state
274 static inline void refresh_cpu_vm_stats(int cpu) { }
277 #endif /* _LINUX_VMSTAT_H */