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
  29 #define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE
  30
  31 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
  32                 FOR_ALL_ZONES(PGALLOC),
  33                 PGFREE, PGACTIVATE, PGDEACTIVATE,
  34                 PGFAULT, PGMAJFAULT,
  35                 FOR_ALL_ZONES(PGREFILL),
  36                 FOR_ALL_ZONES(PGSTEAL),
  37                 FOR_ALL_ZONES(PGSCAN_KSWAPD),
  38                 FOR_ALL_ZONES(PGSCAN_DIRECT),
  39 #ifdef CONFIG_NUMA
  40                 PGSCAN_ZONE_RECLAIM_FAILED,
  41 #endif
  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,
  46 #endif
  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,
  55                 NR_VM_EVENT_ITEMS
  56 };
  57
  58 extern int sysctl_stat_interval;
  59
  60 #ifdef CONFIG_VM_EVENT_COUNTERS
  61 /*
  62  * Light weight per cpu counter implementation.
  63  *
  64  * Counters should only be incremented and no critical kernel component
  65  * should rely on the counter values.
  66  *
  67  * Counters are handled completely inline. On many platforms the code
  68  * generated will simply be the increment of a global address.
  69  */
  70
  71 struct vm_event_state {
  72         unsigned long event[NR_VM_EVENT_ITEMS];
  73 };
  74
  75 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  76
  77 static inline void __count_vm_event(enum vm_event_item item)
  78 {
  79         __this_cpu_inc(vm_event_states.event[item]);
  80 }
  81
  82 static inline void count_vm_event(enum vm_event_item item)
  83 {
  84         this_cpu_inc(vm_event_states.event[item]);
  85 }
  86
  87 static inline void __count_vm_events(enum vm_event_item item, long delta)
  88 {
  89         __this_cpu_add(vm_event_states.event[item], delta);
  90 }
  91
  92 static inline void count_vm_events(enum vm_event_item item, long delta)
  93 {
  94         this_cpu_add(vm_event_states.event[item], delta);
  95 }
  96
  97 extern void all_vm_events(unsigned long *);
  98 #ifdef CONFIG_HOTPLUG
  99 extern void vm_events_fold_cpu(int cpu);
 100 #else
 101 static inline void vm_events_fold_cpu(int cpu)
 102 {
 103 }
 104 #endif
 105
 106 #else
 107
 108 /* Disable counters */
 109 static inline void count_vm_event(enum vm_event_item item)
 110 {
 111 }
 112 static inline void count_vm_events(enum vm_event_item item, long delta)
 113 {
 114 }
 115 static inline void __count_vm_event(enum vm_event_item item)
 116 {
 117 }
 118 static inline void __count_vm_events(enum vm_event_item item, long delta)
 119 {
 120 }
 121 static inline void all_vm_events(unsigned long *ret)
 122 {
 123 }
 124 static inline void vm_events_fold_cpu(int cpu)
 125 {
 126 }
 127
 128 #endif /* CONFIG_VM_EVENT_COUNTERS */
 129
 130 #define __count_zone_vm_events(item, zone, delta) \
 131                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 132                 zone_idx(zone), delta)
 133
 134 /*
 135  * Zone based page accounting with per cpu differentials.
 136  */
 137 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 138
 139 static inline void zone_page_state_add(long x, struct zone *zone,
 140                                  enum zone_stat_item item)
 141 {
 142         atomic_long_add(x, &zone->vm_stat[item]);
 143         atomic_long_add(x, &vm_stat[item]);
 144 }
 145
 146 static inline unsigned long global_page_state(enum zone_stat_item item)
 147 {
 148         long x = atomic_long_read(&vm_stat[item]);
 149 #ifdef CONFIG_SMP
 150         if (x < 0)
 151                 x = 0;
 152 #endif
 153         return x;
 154 }
 155
 156 static inline unsigned long zone_page_state(struct zone *zone,
 157                                         enum zone_stat_item item)
 158 {
 159         long x = atomic_long_read(&zone->vm_stat[item]);
 160 #ifdef CONFIG_SMP
 161         if (x < 0)
 162                 x = 0;
 163 #endif
 164         return x;
 165 }
 166
 167 extern unsigned long global_reclaimable_pages(void);
 168 extern unsigned long zone_reclaimable_pages(struct zone *zone);
 169
 170 #ifdef CONFIG_NUMA
 171 /*
 172  * Determine the per node value of a stat item. This function
 173  * is called frequently in a NUMA machine, so try to be as
 174  * frugal as possible.
 175  */
 176 static inline unsigned long node_page_state(int node,
 177                                  enum zone_stat_item item)
 178 {
 179         struct zone *zones = NODE_DATA(node)->node_zones;
 180
 181         return
 182 #ifdef CONFIG_ZONE_DMA
 183                 zone_page_state(&zones[ZONE_DMA], item) +
 184 #endif
 185 #ifdef CONFIG_ZONE_DMA32
 186                 zone_page_state(&zones[ZONE_DMA32], item) +
 187 #endif
 188 #ifdef CONFIG_HIGHMEM
 189                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 190 #endif
 191                 zone_page_state(&zones[ZONE_NORMAL], item) +
 192                 zone_page_state(&zones[ZONE_MOVABLE], item);
 193 }
 194
 195 extern void zone_statistics(struct zone *, struct zone *);
 196
 197 #else
 198
 199 #define node_page_state(node, item) global_page_state(item)
 200 #define zone_statistics(_zl,_z) do { } while (0)
 201
 202 #endif /* CONFIG_NUMA */
 203
 204 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 205 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 206
 207 static inline void zap_zone_vm_stats(struct zone *zone)
 208 {
 209         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 210 }
 211
 212 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 213
 214 #ifdef CONFIG_SMP
 215 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 216 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 217 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 218
 219 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 220 void inc_zone_page_state(struct page *, enum zone_stat_item);
 221 void dec_zone_page_state(struct page *, enum zone_stat_item);
 222
 223 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 224 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 225 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 226 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 227
 228 void refresh_cpu_vm_stats(int);
 229 #else /* CONFIG_SMP */
 230
 231 /*
 232  * We do not maintain differentials in a single processor configuration.
 233  * The functions directly modify the zone and global counters.
 234  */
 235 static inline void __mod_zone_page_state(struct zone *zone,
 236                         enum zone_stat_item item, int delta)
 237 {
 238         zone_page_state_add(delta, zone, item);
 239 }
 240
 241 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 242 {
 243         atomic_long_inc(&zone->vm_stat[item]);
 244         atomic_long_inc(&vm_stat[item]);
 245 }
 246
 247 static inline void __inc_zone_page_state(struct page *page,
 248                         enum zone_stat_item item)
 249 {
 250         __inc_zone_state(page_zone(page), item);
 251 }
 252
 253 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 254 {
 255         atomic_long_dec(&zone->vm_stat[item]);
 256         atomic_long_dec(&vm_stat[item]);
 257 }
 258
 259 static inline void __dec_zone_page_state(struct page *page,
 260                         enum zone_stat_item item)
 261 {
 262         __dec_zone_state(page_zone(page), item);
 263 }
 264
 265 /*
 266  * We only use atomic operations to update counters. So there is no need to
 267  * disable interrupts.
 268  */
 269 #define inc_zone_page_state __inc_zone_page_state
 270 #define dec_zone_page_state __dec_zone_page_state
 271 #define mod_zone_page_state __mod_zone_page_state
 272
 273 static inline void refresh_cpu_vm_stats(int cpu) { }
 274 #endif
 275
 276 #endif /* _LINUX_VMSTAT_H */