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_VM_EVENT_COUNTERS
12 * Light weight per cpu counter implementation.
14 * Counters should only be incremented. You need to set EMBEDDED
15 * to disable VM_EVENT_COUNTERS. Things like procps (vmstat,
16 * top, etc) use /proc/vmstat and depend on these counters.
18 * Counters are handled completely inline. On many platforms the code
19 * generated will simply be the increment of a global address.
22 #ifdef CONFIG_ZONE_DMA32
23 #define DMA32_ZONE(xx) xx##_DMA32,
25 #define DMA32_ZONE(xx)
29 #define HIGHMEM_ZONE(xx) , xx##_HIGH
31 #define HIGHMEM_ZONE(xx)
34 #define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
36 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
37 FOR_ALL_ZONES(PGALLOC),
38 PGFREE, PGACTIVATE, PGDEACTIVATE,
40 FOR_ALL_ZONES(PGREFILL),
41 FOR_ALL_ZONES(PGSTEAL),
42 FOR_ALL_ZONES(PGSCAN_KSWAPD),
43 FOR_ALL_ZONES(PGSCAN_DIRECT),
44 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
45 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
49 struct vm_event_state {
50 unsigned long event[NR_VM_EVENT_ITEMS];
53 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
55 static inline void __count_vm_event(enum vm_event_item item)
57 __get_cpu_var(vm_event_states).event[item]++;
60 static inline void count_vm_event(enum vm_event_item item)
62 get_cpu_var(vm_event_states).event[item]++;
66 static inline void __count_vm_events(enum vm_event_item item, long delta)
68 __get_cpu_var(vm_event_states).event[item] += delta;
71 static inline void count_vm_events(enum vm_event_item item, long delta)
73 get_cpu_var(vm_event_states).event[item] += delta;
77 extern void all_vm_events(unsigned long *);
79 extern void vm_events_fold_cpu(int cpu);
81 static inline void vm_events_fold_cpu(int cpu)
88 /* Disable counters */
89 #define get_cpu_vm_events(e) 0L
90 #define count_vm_event(e) do { } while (0)
91 #define count_vm_events(e,d) do { } while (0)
92 #define __count_vm_event(e) do { } while (0)
93 #define __count_vm_events(e,d) do { } while (0)
94 #define vm_events_fold_cpu(x) do { } while (0)
96 #endif /* CONFIG_VM_EVENT_COUNTERS */
98 #define __count_zone_vm_events(item, zone, delta) \
99 __count_vm_events(item##_DMA + zone_idx(zone), delta)
102 * Zone based page accounting with per cpu differentials.
104 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
106 static inline void zone_page_state_add(long x, struct zone *zone,
107 enum zone_stat_item item)
109 atomic_long_add(x, &zone->vm_stat[item]);
110 atomic_long_add(x, &vm_stat[item]);
113 static inline unsigned long global_page_state(enum zone_stat_item item)
115 long x = atomic_long_read(&vm_stat[item]);
123 static inline unsigned long zone_page_state(struct zone *zone,
124 enum zone_stat_item item)
126 long x = atomic_long_read(&zone->vm_stat[item]);
136 * Determine the per node value of a stat item. This function
137 * is called frequently in a NUMA machine, so try to be as
138 * frugal as possible.
140 static inline unsigned long node_page_state(int node,
141 enum zone_stat_item item)
143 struct zone *zones = NODE_DATA(node)->node_zones;
146 #ifdef CONFIG_ZONE_DMA32
147 zone_page_state(&zones[ZONE_DMA32], item) +
149 zone_page_state(&zones[ZONE_NORMAL], item) +
150 #ifdef CONFIG_HIGHMEM
151 zone_page_state(&zones[ZONE_HIGHMEM], item) +
153 zone_page_state(&zones[ZONE_DMA], item);
156 extern void zone_statistics(struct zonelist *, struct zone *);
160 #define node_page_state(node, item) global_page_state(item)
161 #define zone_statistics(_zl,_z) do { } while (0)
163 #endif /* CONFIG_NUMA */
165 #define __add_zone_page_state(__z, __i, __d) \
166 __mod_zone_page_state(__z, __i, __d)
167 #define __sub_zone_page_state(__z, __i, __d) \
168 __mod_zone_page_state(__z, __i,-(__d))
170 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
171 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
173 static inline void zap_zone_vm_stats(struct zone *zone)
175 memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
178 extern void inc_zone_state(struct zone *, enum zone_stat_item);
181 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
182 void __inc_zone_page_state(struct page *, enum zone_stat_item);
183 void __dec_zone_page_state(struct page *, enum zone_stat_item);
185 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
186 void inc_zone_page_state(struct page *, enum zone_stat_item);
187 void dec_zone_page_state(struct page *, enum zone_stat_item);
189 extern void inc_zone_state(struct zone *, enum zone_stat_item);
190 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
191 extern void dec_zone_state(struct zone *, enum zone_stat_item);
192 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
194 void refresh_cpu_vm_stats(int);
195 void refresh_vm_stats(void);
197 #else /* CONFIG_SMP */
200 * We do not maintain differentials in a single processor configuration.
201 * The functions directly modify the zone and global counters.
203 static inline void __mod_zone_page_state(struct zone *zone,
204 enum zone_stat_item item, int delta)
206 zone_page_state_add(delta, zone, item);
209 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
211 atomic_long_inc(&zone->vm_stat[item]);
212 atomic_long_inc(&vm_stat[item]);
215 static inline void __inc_zone_page_state(struct page *page,
216 enum zone_stat_item item)
218 __inc_zone_state(page_zone(page), item);
221 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
223 atomic_long_dec(&zone->vm_stat[item]);
224 atomic_long_dec(&vm_stat[item]);
227 static inline void __dec_zone_page_state(struct page *page,
228 enum zone_stat_item item)
230 atomic_long_dec(&page_zone(page)->vm_stat[item]);
231 atomic_long_dec(&vm_stat[item]);
235 * We only use atomic operations to update counters. So there is no need to
236 * disable interrupts.
238 #define inc_zone_page_state __inc_zone_page_state
239 #define dec_zone_page_state __dec_zone_page_state
240 #define mod_zone_page_state __mod_zone_page_state
242 static inline void refresh_cpu_vm_stats(int cpu) { }
243 static inline void refresh_vm_stats(void) { }
246 #endif /* _LINUX_VMSTAT_H */