1 #ifndef _LINUX_VMSTAT_H
2 #define _LINUX_VMSTAT_H
4 #include <linux/types.h>
5 #include <linux/percpu.h>
6 #include <linux/mmzone.h>
7 #include <asm/atomic.h>
9 #ifdef CONFIG_VM_EVENT_COUNTERS
11 * Light weight per cpu counter implementation.
13 * Counters should only be incremented and no critical kernel component
14 * should rely on the counter values.
16 * Counters are handled completely inline. On many platforms the code
17 * generated will simply be the increment of a global address.
20 #ifdef CONFIG_ZONE_DMA32
21 #define DMA32_ZONE(xx) xx##_DMA32,
23 #define DMA32_ZONE(xx)
27 #define HIGHMEM_ZONE(xx) , xx##_HIGH
29 #define HIGHMEM_ZONE(xx)
32 #define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
34 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
35 FOR_ALL_ZONES(PGALLOC),
36 PGFREE, PGACTIVATE, PGDEACTIVATE,
38 FOR_ALL_ZONES(PGREFILL),
39 FOR_ALL_ZONES(PGSTEAL),
40 FOR_ALL_ZONES(PGSCAN_KSWAPD),
41 FOR_ALL_ZONES(PGSCAN_DIRECT),
42 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
43 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
47 struct vm_event_state {
48 unsigned long event[NR_VM_EVENT_ITEMS];
51 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
53 static inline void __count_vm_event(enum vm_event_item item)
55 __get_cpu_var(vm_event_states).event[item]++;
58 static inline void count_vm_event(enum vm_event_item item)
60 get_cpu_var(vm_event_states).event[item]++;
64 static inline void __count_vm_events(enum vm_event_item item, long delta)
66 __get_cpu_var(vm_event_states).event[item] += delta;
69 static inline void count_vm_events(enum vm_event_item item, long delta)
71 get_cpu_var(vm_event_states).event[item] += delta;
75 extern void all_vm_events(unsigned long *);
76 extern void vm_events_fold_cpu(int cpu);
80 /* Disable counters */
81 #define get_cpu_vm_events(e) 0L
82 #define count_vm_event(e) do { } while (0)
83 #define count_vm_events(e,d) do { } while (0)
84 #define __count_vm_event(e) do { } while (0)
85 #define __count_vm_events(e,d) do { } while (0)
86 #define vm_events_fold_cpu(x) do { } while (0)
88 #endif /* CONFIG_VM_EVENT_COUNTERS */
90 #define __count_zone_vm_events(item, zone, delta) \
91 __count_vm_events(item##_DMA + zone_idx(zone), delta)
94 * Zone based page accounting with per cpu differentials.
96 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
98 static inline void zone_page_state_add(long x, struct zone *zone,
99 enum zone_stat_item item)
101 atomic_long_add(x, &zone->vm_stat[item]);
102 atomic_long_add(x, &vm_stat[item]);
105 static inline unsigned long global_page_state(enum zone_stat_item item)
107 long x = atomic_long_read(&vm_stat[item]);
115 static inline unsigned long zone_page_state(struct zone *zone,
116 enum zone_stat_item item)
118 long x = atomic_long_read(&zone->vm_stat[item]);
128 * Determine the per node value of a stat item. This function
129 * is called frequently in a NUMA machine, so try to be as
130 * frugal as possible.
132 static inline unsigned long node_page_state(int node,
133 enum zone_stat_item item)
135 struct zone *zones = NODE_DATA(node)->node_zones;
138 #ifdef CONFIG_ZONE_DMA32
139 zone_page_state(&zones[ZONE_DMA32], item) +
141 zone_page_state(&zones[ZONE_NORMAL], item) +
142 #ifdef CONFIG_HIGHMEM
143 zone_page_state(&zones[ZONE_HIGHMEM], item) +
145 zone_page_state(&zones[ZONE_DMA], item);
148 extern void zone_statistics(struct zonelist *, struct zone *);
152 #define node_page_state(node, item) global_page_state(item)
153 #define zone_statistics(_zl,_z) do { } while (0)
155 #endif /* CONFIG_NUMA */
157 #define __add_zone_page_state(__z, __i, __d) \
158 __mod_zone_page_state(__z, __i, __d)
159 #define __sub_zone_page_state(__z, __i, __d) \
160 __mod_zone_page_state(__z, __i,-(__d))
162 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
163 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
165 static inline void zap_zone_vm_stats(struct zone *zone)
167 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
170 extern void inc_zone_state(struct zone *, enum zone_stat_item);
173 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
174 void __inc_zone_page_state(struct page *, enum zone_stat_item);
175 void __dec_zone_page_state(struct page *, enum zone_stat_item);
177 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
178 void inc_zone_page_state(struct page *, enum zone_stat_item);
179 void dec_zone_page_state(struct page *, enum zone_stat_item);
181 extern void inc_zone_state(struct zone *, enum zone_stat_item);
183 void refresh_cpu_vm_stats(int);
184 void refresh_vm_stats(void);
186 #else /* CONFIG_SMP */
189 * We do not maintain differentials in a single processor configuration.
190 * The functions directly modify the zone and global counters.
192 static inline void __mod_zone_page_state(struct zone *zone,
193 enum zone_stat_item item, int delta)
195 zone_page_state_add(delta, zone, item);
198 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
200 atomic_long_inc(&zone->vm_stat[item]);
201 atomic_long_inc(&vm_stat[item]);
204 static inline void __inc_zone_page_state(struct page *page,
205 enum zone_stat_item item)
207 __inc_zone_state(page_zone(page), item);
210 static inline void __dec_zone_page_state(struct page *page,
211 enum zone_stat_item item)
213 atomic_long_dec(&page_zone(page)->vm_stat[item]);
214 atomic_long_dec(&vm_stat[item]);
218 * We only use atomic operations to update counters. So there is no need to
219 * disable interrupts.
221 #define inc_zone_page_state __inc_zone_page_state
222 #define dec_zone_page_state __dec_zone_page_state
223 #define mod_zone_page_state __mod_zone_page_state
225 static inline void refresh_cpu_vm_stats(int cpu) { }
226 static inline void refresh_vm_stats(void) { }
229 #endif /* _LINUX_VMSTAT_H */