include/linux/vmstat.h

   1 #ifndef _LINUX_VMSTAT_H
   2 #define _LINUX_VMSTAT_H
   3
   4 #include <linux/types.h>
   5 #include <linux/percpu.h>
   6 #include <linux/config.h>
   7 #include <linux/mmzone.h>
   8 #include <asm/atomic.h>
   9
  10 #ifdef CONFIG_VM_EVENT_COUNTERS
  11 /*
  12  * Light weight per cpu counter implementation.
  13  *
  14  * Counters should only be incremented and no critical kernel component
  15  * should rely on the counter values.
  16  *
  17  * Counters are handled completely inline. On many platforms the code
  18  * generated will simply be the increment of a global address.
  19  */
  20
  21 #define FOR_ALL_ZONES(x) x##_DMA, x##_DMA32, x##_NORMAL, x##_HIGH
  22
  23 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
  24                 FOR_ALL_ZONES(PGALLOC),
  25                 PGFREE, PGACTIVATE, PGDEACTIVATE,
  26                 PGFAULT, PGMAJFAULT,
  27                 FOR_ALL_ZONES(PGREFILL),
  28                 FOR_ALL_ZONES(PGSTEAL),
  29                 FOR_ALL_ZONES(PGSCAN_KSWAPD),
  30                 FOR_ALL_ZONES(PGSCAN_DIRECT),
  31                 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
  32                 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
  33                 NR_VM_EVENT_ITEMS
  34 };
  35
  36 struct vm_event_state {
  37         unsigned long event[NR_VM_EVENT_ITEMS];
  38 };
  39
  40 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  41
  42 static inline void __count_vm_event(enum vm_event_item item)
  43 {
  44         __get_cpu_var(vm_event_states.event[item])++;
  45 }
  46
  47 static inline void count_vm_event(enum vm_event_item item)
  48 {
  49         get_cpu_var(vm_event_states.event[item])++;
  50         put_cpu();
  51 }
  52
  53 static inline void __count_vm_events(enum vm_event_item item, long delta)
  54 {
  55         __get_cpu_var(vm_event_states.event[item]) += delta;
  56 }
  57
  58 static inline void count_vm_events(enum vm_event_item item, long delta)
  59 {
  60         get_cpu_var(vm_event_states.event[item])++;
  61         put_cpu();
  62 }
  63
  64 extern void all_vm_events(unsigned long *);
  65 extern void vm_events_fold_cpu(int cpu);
  66
  67 #else
  68
  69 /* Disable counters */
  70 #define get_cpu_vm_events(e)    0L
  71 #define count_vm_event(e)       do { } while (0)
  72 #define count_vm_events(e,d)    do { } while (0)
  73 #define __count_vm_event(e)     do { } while (0)
  74 #define __count_vm_events(e,d)  do { } while (0)
  75 #define vm_events_fold_cpu(x)   do { } while (0)
  76
  77 #endif /* CONFIG_VM_EVENT_COUNTERS */
  78
  79 #define __count_zone_vm_events(item, zone, delta) \
  80                         __count_vm_events(item##_DMA + zone_idx(zone), delta)
  81
  82 /*
  83  * Zone based page accounting with per cpu differentials.
  84  */
  85 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
  86
  87 static inline void zone_page_state_add(long x, struct zone *zone,
  88                                  enum zone_stat_item item)
  89 {
  90         atomic_long_add(x, &zone->vm_stat[item]);
  91         atomic_long_add(x, &vm_stat[item]);
  92 }
  93
  94 static inline unsigned long global_page_state(enum zone_stat_item item)
  95 {
  96         long x = atomic_long_read(&vm_stat[item]);
  97 #ifdef CONFIG_SMP
  98         if (x < 0)
  99                 x = 0;
 100 #endif
 101         return x;
 102 }
 103
 104 static inline unsigned long zone_page_state(struct zone *zone,
 105                                         enum zone_stat_item item)
 106 {
 107         long x = atomic_long_read(&zone->vm_stat[item]);
 108 #ifdef CONFIG_SMP
 109         if (x < 0)
 110                 x = 0;
 111 #endif
 112         return x;
 113 }
 114
 115 #ifdef CONFIG_NUMA
 116 /*
 117  * Determine the per node value of a stat item. This function
 118  * is called frequently in a NUMA machine, so try to be as
 119  * frugal as possible.
 120  */
 121 static inline unsigned long node_page_state(int node,
 122                                  enum zone_stat_item item)
 123 {
 124         struct zone *zones = NODE_DATA(node)->node_zones;
 125
 126         return
 127 #ifndef CONFIG_DMA_IS_NORMAL
 128 #if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64
 129                 zone_page_state(&zones[ZONE_DMA32], item) +
 130 #endif
 131                 zone_page_state(&zones[ZONE_NORMAL], item) +
 132 #endif
 133 #ifdef CONFIG_HIGHMEM
 134                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 135 #endif
 136                 zone_page_state(&zones[ZONE_DMA], item);
 137 }
 138
 139 extern void zone_statistics(struct zonelist *, struct zone *);
 140
 141 #else
 142
 143 #define node_page_state(node, item) global_page_state(item)
 144 #define zone_statistics(_zl,_z) do { } while (0)
 145
 146 #endif /* CONFIG_NUMA */
 147
 148 #define __add_zone_page_state(__z, __i, __d)    \
 149                 __mod_zone_page_state(__z, __i, __d)
 150 #define __sub_zone_page_state(__z, __i, __d)    \
 151                 __mod_zone_page_state(__z, __i,-(__d))
 152
 153 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 154 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 155
 156 static inline void zap_zone_vm_stats(struct zone *zone)
 157 {
 158         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 159 }
 160
 161 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 162
 163 #ifdef CONFIG_SMP
 164 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 165 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 166 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 167
 168 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 169 void inc_zone_page_state(struct page *, enum zone_stat_item);
 170 void dec_zone_page_state(struct page *, enum zone_stat_item);
 171
 172 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 173
 174 void refresh_cpu_vm_stats(int);
 175 void refresh_vm_stats(void);
 176
 177 #else /* CONFIG_SMP */
 178
 179 /*
 180  * We do not maintain differentials in a single processor configuration.
 181  * The functions directly modify the zone and global counters.
 182  */
 183 static inline void __mod_zone_page_state(struct zone *zone,
 184                         enum zone_stat_item item, int delta)
 185 {
 186         zone_page_state_add(delta, zone, item);
 187 }
 188
 189 static inline void __inc_zone_page_state(struct page *page,
 190                         enum zone_stat_item item)
 191 {
 192         atomic_long_inc(&page_zone(page)->vm_stat[item]);
 193         atomic_long_inc(&vm_stat[item]);
 194 }
 195
 196 static inline void __dec_zone_page_state(struct page *page,
 197                         enum zone_stat_item item)
 198 {
 199         atomic_long_dec(&page_zone(page)->vm_stat[item]);
 200         atomic_long_dec(&vm_stat[item]);
 201 }
 202
 203 /*
 204  * We only use atomic operations to update counters. So there is no need to
 205  * disable interrupts.
 206  */
 207 #define inc_zone_page_state __inc_zone_page_state
 208 #define dec_zone_page_state __dec_zone_page_state
 209 #define mod_zone_page_state __mod_zone_page_state
 210
 211 static inline void refresh_cpu_vm_stats(int cpu) { }
 212 static inline void refresh_vm_stats(void) { }
 213 #endif
 214
 215 #endif /* _LINUX_VMSTAT_H */