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/mm.h>
   7 #include <linux/mmzone.h>
   8 #include <asm/atomic.h>
   9
  10 #ifdef CONFIG_ZONE_DMA
  11 #define DMA_ZONE(xx) xx##_DMA,
  12 #else
  13 #define DMA_ZONE(xx)
  14 #endif
  15
  16 #ifdef CONFIG_ZONE_DMA32
  17 #define DMA32_ZONE(xx) xx##_DMA32,
  18 #else
  19 #define DMA32_ZONE(xx)
  20 #endif
  21
  22 #ifdef CONFIG_HIGHMEM
  23 #define HIGHMEM_ZONE(xx) , xx##_HIGH
  24 #else
  25 #define HIGHMEM_ZONE(xx)
  26 #endif
  27
  28 #define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
  29
  30 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
  31                 FOR_ALL_ZONES(PGALLOC),
  32                 PGFREE, PGACTIVATE, PGDEACTIVATE,
  33                 PGFAULT, PGMAJFAULT,
  34                 FOR_ALL_ZONES(PGREFILL),
  35                 FOR_ALL_ZONES(PGSTEAL),
  36                 FOR_ALL_ZONES(PGSCAN_KSWAPD),
  37                 FOR_ALL_ZONES(PGSCAN_DIRECT),
  38                 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
  39                 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
  40                 NR_VM_EVENT_ITEMS
  41 };
  42
  43 #ifdef CONFIG_VM_EVENT_COUNTERS
  44 /*
  45  * Light weight per cpu counter implementation.
  46  *
  47  * Counters should only be incremented and no critical kernel component
  48  * should rely on the counter values.
  49  *
  50  * Counters are handled completely inline. On many platforms the code
  51  * generated will simply be the increment of a global address.
  52  */
  53
  54 struct vm_event_state {
  55         unsigned long event[NR_VM_EVENT_ITEMS];
  56 };
  57
  58 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  59
  60 static inline void __count_vm_event(enum vm_event_item item)
  61 {
  62         __get_cpu_var(vm_event_states).event[item]++;
  63 }
  64
  65 static inline void count_vm_event(enum vm_event_item item)
  66 {
  67         get_cpu_var(vm_event_states).event[item]++;
  68         put_cpu();
  69 }
  70
  71 static inline void __count_vm_events(enum vm_event_item item, long delta)
  72 {
  73         __get_cpu_var(vm_event_states).event[item] += delta;
  74 }
  75
  76 static inline void count_vm_events(enum vm_event_item item, long delta)
  77 {
  78         get_cpu_var(vm_event_states).event[item] += delta;
  79         put_cpu();
  80 }
  81
  82 extern void all_vm_events(unsigned long *);
  83 #ifdef CONFIG_HOTPLUG
  84 extern void vm_events_fold_cpu(int cpu);
  85 #else
  86 static inline void vm_events_fold_cpu(int cpu)
  87 {
  88 }
  89 #endif
  90
  91 #else
  92
  93 /* Disable counters */
  94 static inline void count_vm_event(enum vm_event_item item)
  95 {
  96 }
  97 static inline void count_vm_events(enum vm_event_item item, long delta)
  98 {
  99 }
 100 static inline void __count_vm_event(enum vm_event_item item)
 101 {
 102 }
 103 static inline void __count_vm_events(enum vm_event_item item, long delta)
 104 {
 105 }
 106 static inline void all_vm_events(unsigned long *ret)
 107 {
 108 }
 109 static inline void vm_events_fold_cpu(int cpu)
 110 {
 111 }
 112
 113 #endif /* CONFIG_VM_EVENT_COUNTERS */
 114
 115 #define __count_zone_vm_events(item, zone, delta) \
 116                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 117                 zone_idx(zone), delta)
 118
 119 /*
 120  * Zone based page accounting with per cpu differentials.
 121  */
 122 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 123
 124 static inline void zone_page_state_add(long x, struct zone *zone,
 125                                  enum zone_stat_item item)
 126 {
 127         atomic_long_add(x, &zone->vm_stat[item]);
 128         atomic_long_add(x, &vm_stat[item]);
 129 }
 130
 131 static inline unsigned long global_page_state(enum zone_stat_item item)
 132 {
 133         long x = atomic_long_read(&vm_stat[item]);
 134 #ifdef CONFIG_SMP
 135         if (x < 0)
 136                 x = 0;
 137 #endif
 138         return x;
 139 }
 140
 141 static inline unsigned long zone_page_state(struct zone *zone,
 142                                         enum zone_stat_item item)
 143 {
 144         long x = atomic_long_read(&zone->vm_stat[item]);
 145 #ifdef CONFIG_SMP
 146         if (x < 0)
 147                 x = 0;
 148 #endif
 149         return x;
 150 }
 151
 152 #ifdef CONFIG_NUMA
 153 /*
 154  * Determine the per node value of a stat item. This function
 155  * is called frequently in a NUMA machine, so try to be as
 156  * frugal as possible.
 157  */
 158 static inline unsigned long node_page_state(int node,
 159                                  enum zone_stat_item item)
 160 {
 161         struct zone *zones = NODE_DATA(node)->node_zones;
 162
 163         return
 164 #ifdef CONFIG_ZONE_DMA
 165                 zone_page_state(&zones[ZONE_DMA], item) +
 166 #endif
 167 #ifdef CONFIG_ZONE_DMA32
 168                 zone_page_state(&zones[ZONE_DMA32], item) +
 169 #endif
 170 #ifdef CONFIG_HIGHMEM
 171                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 172 #endif
 173                 zone_page_state(&zones[ZONE_NORMAL], item);
 174 }
 175
 176 extern void zone_statistics(struct zonelist *, struct zone *);
 177
 178 #else
 179
 180 #define node_page_state(node, item) global_page_state(item)
 181 #define zone_statistics(_zl,_z) do { } while (0)
 182
 183 #endif /* CONFIG_NUMA */
 184
 185 #define __add_zone_page_state(__z, __i, __d)    \
 186                 __mod_zone_page_state(__z, __i, __d)
 187 #define __sub_zone_page_state(__z, __i, __d)    \
 188                 __mod_zone_page_state(__z, __i,-(__d))
 189
 190 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 191 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 192
 193 static inline void zap_zone_vm_stats(struct zone *zone)
 194 {
 195         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 196 }
 197
 198 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 199
 200 #ifdef CONFIG_SMP
 201 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 202 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 203 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 204
 205 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 206 void inc_zone_page_state(struct page *, enum zone_stat_item);
 207 void dec_zone_page_state(struct page *, enum zone_stat_item);
 208
 209 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 210 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 211 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 212 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 213
 214 void refresh_cpu_vm_stats(int);
 215 void refresh_vm_stats(void);
 216
 217 #else /* CONFIG_SMP */
 218
 219 /*
 220  * We do not maintain differentials in a single processor configuration.
 221  * The functions directly modify the zone and global counters.
 222  */
 223 static inline void __mod_zone_page_state(struct zone *zone,
 224                         enum zone_stat_item item, int delta)
 225 {
 226         zone_page_state_add(delta, zone, item);
 227 }
 228
 229 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 230 {
 231         atomic_long_inc(&zone->vm_stat[item]);
 232         atomic_long_inc(&vm_stat[item]);
 233 }
 234
 235 static inline void __inc_zone_page_state(struct page *page,
 236                         enum zone_stat_item item)
 237 {
 238         __inc_zone_state(page_zone(page), item);
 239 }
 240
 241 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 242 {
 243         atomic_long_dec(&zone->vm_stat[item]);
 244         atomic_long_dec(&vm_stat[item]);
 245 }
 246
 247 static inline void __dec_zone_page_state(struct page *page,
 248                         enum zone_stat_item item)
 249 {
 250         atomic_long_dec(&page_zone(page)->vm_stat[item]);
 251         atomic_long_dec(&vm_stat[item]);
 252 }
 253
 254 /*
 255  * We only use atomic operations to update counters. So there is no need to
 256  * disable interrupts.
 257  */
 258 #define inc_zone_page_state __inc_zone_page_state
 259 #define dec_zone_page_state __dec_zone_page_state
 260 #define mod_zone_page_state __mod_zone_page_state
 261
 262 static inline void refresh_cpu_vm_stats(int cpu) { }
 263 static inline void refresh_vm_stats(void) { }
 264 #endif
 265
 266 #endif /* _LINUX_VMSTAT_H */