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 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
44 #ifdef CONFIG_HUGETLB_PAGE
45 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
47 UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
48 UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */
49 UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */
50 UNEVICTABLE_PGMLOCKED,
51 UNEVICTABLE_PGMUNLOCKED,
52 UNEVICTABLE_PGCLEARED, /* on COW, page truncate */
53 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
54 UNEVICTABLE_MLOCKFREED,
58 extern int sysctl_stat_interval;
60 #ifdef CONFIG_VM_EVENT_COUNTERS
62 * Light weight per cpu counter implementation.
64 * Counters should only be incremented and no critical kernel component
65 * should rely on the counter values.
67 * Counters are handled completely inline. On many platforms the code
68 * generated will simply be the increment of a global address.
71 struct vm_event_state {
72 unsigned long event[NR_VM_EVENT_ITEMS];
75 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
77 static inline void __count_vm_event(enum vm_event_item item)
79 __get_cpu_var(vm_event_states).event[item]++;
82 static inline void count_vm_event(enum vm_event_item item)
84 get_cpu_var(vm_event_states).event[item]++;
88 static inline void __count_vm_events(enum vm_event_item item, long delta)
90 __get_cpu_var(vm_event_states).event[item] += delta;
93 static inline void count_vm_events(enum vm_event_item item, long delta)
95 get_cpu_var(vm_event_states).event[item] += delta;
99 extern void all_vm_events(unsigned long *);
100 #ifdef CONFIG_HOTPLUG
101 extern void vm_events_fold_cpu(int cpu);
103 static inline void vm_events_fold_cpu(int cpu)
110 /* Disable counters */
111 static inline void count_vm_event(enum vm_event_item item)
114 static inline void count_vm_events(enum vm_event_item item, long delta)
117 static inline void __count_vm_event(enum vm_event_item item)
120 static inline void __count_vm_events(enum vm_event_item item, long delta)
123 static inline void all_vm_events(unsigned long *ret)
126 static inline void vm_events_fold_cpu(int cpu)
130 #endif /* CONFIG_VM_EVENT_COUNTERS */
132 #define __count_zone_vm_events(item, zone, delta) \
133 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
134 zone_idx(zone), delta)
137 * Zone based page accounting with per cpu differentials.
139 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
141 static inline void zone_page_state_add(long x, struct zone *zone,
142 enum zone_stat_item item)
144 atomic_long_add(x, &zone->vm_stat[item]);
145 atomic_long_add(x, &vm_stat[item]);
148 static inline unsigned long global_page_state(enum zone_stat_item item)
150 long x = atomic_long_read(&vm_stat[item]);
158 static inline unsigned long zone_page_state(struct zone *zone,
159 enum zone_stat_item item)
161 long x = atomic_long_read(&zone->vm_stat[item]);
169 extern unsigned long global_lru_pages(void);
171 static inline unsigned long zone_lru_pages(struct zone *zone)
173 return (zone_page_state(zone, NR_ACTIVE_ANON)
174 + zone_page_state(zone, NR_ACTIVE_FILE)
175 + zone_page_state(zone, NR_INACTIVE_ANON)
176 + zone_page_state(zone, NR_INACTIVE_FILE));
181 * Determine the per node value of a stat item. This function
182 * is called frequently in a NUMA machine, so try to be as
183 * frugal as possible.
185 static inline unsigned long node_page_state(int node,
186 enum zone_stat_item item)
188 struct zone *zones = NODE_DATA(node)->node_zones;
191 #ifdef CONFIG_ZONE_DMA
192 zone_page_state(&zones[ZONE_DMA], item) +
194 #ifdef CONFIG_ZONE_DMA32
195 zone_page_state(&zones[ZONE_DMA32], item) +
197 #ifdef CONFIG_HIGHMEM
198 zone_page_state(&zones[ZONE_HIGHMEM], item) +
200 zone_page_state(&zones[ZONE_NORMAL], item) +
201 zone_page_state(&zones[ZONE_MOVABLE], item);
204 extern void zone_statistics(struct zone *, struct zone *);
208 #define node_page_state(node, item) global_page_state(item)
209 #define zone_statistics(_zl,_z) do { } while (0)
211 #endif /* CONFIG_NUMA */
213 #define __add_zone_page_state(__z, __i, __d) \
214 __mod_zone_page_state(__z, __i, __d)
215 #define __sub_zone_page_state(__z, __i, __d) \
216 __mod_zone_page_state(__z, __i,-(__d))
218 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
219 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
221 static inline void zap_zone_vm_stats(struct zone *zone)
223 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
226 extern void inc_zone_state(struct zone *, enum zone_stat_item);
229 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
230 void __inc_zone_page_state(struct page *, enum zone_stat_item);
231 void __dec_zone_page_state(struct page *, enum zone_stat_item);
233 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
234 void inc_zone_page_state(struct page *, enum zone_stat_item);
235 void dec_zone_page_state(struct page *, enum zone_stat_item);
237 extern void inc_zone_state(struct zone *, enum zone_stat_item);
238 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
239 extern void dec_zone_state(struct zone *, enum zone_stat_item);
240 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
242 void refresh_cpu_vm_stats(int);
243 #else /* CONFIG_SMP */
246 * We do not maintain differentials in a single processor configuration.
247 * The functions directly modify the zone and global counters.
249 static inline void __mod_zone_page_state(struct zone *zone,
250 enum zone_stat_item item, int delta)
252 zone_page_state_add(delta, zone, item);
255 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
257 atomic_long_inc(&zone->vm_stat[item]);
258 atomic_long_inc(&vm_stat[item]);
261 static inline void __inc_zone_page_state(struct page *page,
262 enum zone_stat_item item)
264 __inc_zone_state(page_zone(page), item);
267 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
269 atomic_long_dec(&zone->vm_stat[item]);
270 atomic_long_dec(&vm_stat[item]);
273 static inline void __dec_zone_page_state(struct page *page,
274 enum zone_stat_item item)
276 __dec_zone_state(page_zone(page), item);
280 * We only use atomic operations to update counters. So there is no need to
281 * disable interrupts.
283 #define inc_zone_page_state __inc_zone_page_state
284 #define dec_zone_page_state __dec_zone_page_state
285 #define mod_zone_page_state __mod_zone_page_state
287 static inline void refresh_cpu_vm_stats(int cpu) { }
290 #endif /* _LINUX_VMSTAT_H */