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                 KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY,
  44                 KSWAPD_SKIP_CONGESTION_WAIT,
  45                 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
  46 #ifdef CONFIG_HUGETLB_PAGE
  47                 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
  48 #endif
  49                 UNEVICTABLE_PGCULLED,   /* culled to noreclaim list */
  50                 UNEVICTABLE_PGSCANNED,  /* scanned for reclaimability */
  51                 UNEVICTABLE_PGRESCUED,  /* rescued from noreclaim list */
  52                 UNEVICTABLE_PGMLOCKED,
  53                 UNEVICTABLE_PGMUNLOCKED,
  54                 UNEVICTABLE_PGCLEARED,  /* on COW, page truncate */
  55                 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
  56                 UNEVICTABLE_MLOCKFREED,
  57                 NR_VM_EVENT_ITEMS
  58 };
  59
  60 extern int sysctl_stat_interval;
  61
  62 #ifdef CONFIG_VM_EVENT_COUNTERS
  63 /*
  64  * Light weight per cpu counter implementation.
  65  *
  66  * Counters should only be incremented and no critical kernel component
  67  * should rely on the counter values.
  68  *
  69  * Counters are handled completely inline. On many platforms the code
  70  * generated will simply be the increment of a global address.
  71  */
  72
  73 struct vm_event_state {
  74         unsigned long event[NR_VM_EVENT_ITEMS];
  75 };
  76
  77 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  78
  79 static inline void __count_vm_event(enum vm_event_item item)
  80 {
  81         __this_cpu_inc(per_cpu_var(vm_event_states).event[item]);
  82 }
  83
  84 static inline void count_vm_event(enum vm_event_item item)
  85 {
  86         this_cpu_inc(per_cpu_var(vm_event_states).event[item]);
  87 }
  88
  89 static inline void __count_vm_events(enum vm_event_item item, long delta)
  90 {
  91         __this_cpu_add(per_cpu_var(vm_event_states).event[item], delta);
  92 }
  93
  94 static inline void count_vm_events(enum vm_event_item item, long delta)
  95 {
  96         this_cpu_add(per_cpu_var(vm_event_states).event[item], delta);
  97 }
  98
  99 extern void all_vm_events(unsigned long *);
 100 #ifdef CONFIG_HOTPLUG
 101 extern void vm_events_fold_cpu(int cpu);
 102 #else
 103 static inline void vm_events_fold_cpu(int cpu)
 104 {
 105 }
 106 #endif
 107
 108 #else
 109
 110 /* Disable counters */
 111 static inline void count_vm_event(enum vm_event_item item)
 112 {
 113 }
 114 static inline void count_vm_events(enum vm_event_item item, long delta)
 115 {
 116 }
 117 static inline void __count_vm_event(enum vm_event_item item)
 118 {
 119 }
 120 static inline void __count_vm_events(enum vm_event_item item, long delta)
 121 {
 122 }
 123 static inline void all_vm_events(unsigned long *ret)
 124 {
 125 }
 126 static inline void vm_events_fold_cpu(int cpu)
 127 {
 128 }
 129
 130 #endif /* CONFIG_VM_EVENT_COUNTERS */
 131
 132 #define __count_zone_vm_events(item, zone, delta) \
 133                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 134                 zone_idx(zone), delta)
 135
 136 /*
 137  * Zone based page accounting with per cpu differentials.
 138  */
 139 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 140
 141 static inline void zone_page_state_add(long x, struct zone *zone,
 142                                  enum zone_stat_item item)
 143 {
 144         atomic_long_add(x, &zone->vm_stat[item]);
 145         atomic_long_add(x, &vm_stat[item]);
 146 }
 147
 148 static inline unsigned long global_page_state(enum zone_stat_item item)
 149 {
 150         long x = atomic_long_read(&vm_stat[item]);
 151 #ifdef CONFIG_SMP
 152         if (x < 0)
 153                 x = 0;
 154 #endif
 155         return x;
 156 }
 157
 158 static inline unsigned long zone_page_state(struct zone *zone,
 159                                         enum zone_stat_item item)
 160 {
 161         long x = atomic_long_read(&zone->vm_stat[item]);
 162 #ifdef CONFIG_SMP
 163         if (x < 0)
 164                 x = 0;
 165 #endif
 166         return x;
 167 }
 168
 169 extern unsigned long global_reclaimable_pages(void);
 170 extern unsigned long zone_reclaimable_pages(struct zone *zone);
 171
 172 #ifdef CONFIG_NUMA
 173 /*
 174  * Determine the per node value of a stat item. This function
 175  * is called frequently in a NUMA machine, so try to be as
 176  * frugal as possible.
 177  */
 178 static inline unsigned long node_page_state(int node,
 179                                  enum zone_stat_item item)
 180 {
 181         struct zone *zones = NODE_DATA(node)->node_zones;
 182
 183         return
 184 #ifdef CONFIG_ZONE_DMA
 185                 zone_page_state(&zones[ZONE_DMA], item) +
 186 #endif
 187 #ifdef CONFIG_ZONE_DMA32
 188                 zone_page_state(&zones[ZONE_DMA32], item) +
 189 #endif
 190 #ifdef CONFIG_HIGHMEM
 191                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 192 #endif
 193                 zone_page_state(&zones[ZONE_NORMAL], item) +
 194                 zone_page_state(&zones[ZONE_MOVABLE], item);
 195 }
 196
 197 extern void zone_statistics(struct zone *, struct zone *);
 198
 199 #else
 200
 201 #define node_page_state(node, item) global_page_state(item)
 202 #define zone_statistics(_zl,_z) do { } while (0)
 203
 204 #endif /* CONFIG_NUMA */
 205
 206 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 207 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 208
 209 static inline void zap_zone_vm_stats(struct zone *zone)
 210 {
 211         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 212 }
 213
 214 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 215
 216 #ifdef CONFIG_SMP
 217 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 218 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 219 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 220
 221 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 222 void inc_zone_page_state(struct page *, enum zone_stat_item);
 223 void dec_zone_page_state(struct page *, enum zone_stat_item);
 224
 225 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 226 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 227 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 228 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 229
 230 void refresh_cpu_vm_stats(int);
 231 #else /* CONFIG_SMP */
 232
 233 /*
 234  * We do not maintain differentials in a single processor configuration.
 235  * The functions directly modify the zone and global counters.
 236  */
 237 static inline void __mod_zone_page_state(struct zone *zone,
 238                         enum zone_stat_item item, int delta)
 239 {
 240         zone_page_state_add(delta, zone, item);
 241 }
 242
 243 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 244 {
 245         atomic_long_inc(&zone->vm_stat[item]);
 246         atomic_long_inc(&vm_stat[item]);
 247 }
 248
 249 static inline void __inc_zone_page_state(struct page *page,
 250                         enum zone_stat_item item)
 251 {
 252         __inc_zone_state(page_zone(page), item);
 253 }
 254
 255 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 256 {
 257         atomic_long_dec(&zone->vm_stat[item]);
 258         atomic_long_dec(&vm_stat[item]);
 259 }
 260
 261 static inline void __dec_zone_page_state(struct page *page,
 262                         enum zone_stat_item item)
 263 {
 264         __dec_zone_state(page_zone(page), item);
 265 }
 266
 267 /*
 268  * We only use atomic operations to update counters. So there is no need to
 269  * disable interrupts.
 270  */
 271 #define inc_zone_page_state __inc_zone_page_state
 272 #define dec_zone_page_state __dec_zone_page_state
 273 #define mod_zone_page_state __mod_zone_page_state
 274
 275 static inline void refresh_cpu_vm_stats(int cpu) { }
 276 #endif
 277
 278 #endif /* _LINUX_VMSTAT_H */