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_COMPACTION
  47                 COMPACTBLOCKS, COMPACTPAGES, COMPACTPAGEFAILED,
  48                 COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,
  49 #endif
  50 #ifdef CONFIG_HUGETLB_PAGE
  51                 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
  52 #endif
  53                 UNEVICTABLE_PGCULLED,   /* culled to noreclaim list */
  54                 UNEVICTABLE_PGSCANNED,  /* scanned for reclaimability */
  55                 UNEVICTABLE_PGRESCUED,  /* rescued from noreclaim list */
  56                 UNEVICTABLE_PGMLOCKED,
  57                 UNEVICTABLE_PGMUNLOCKED,
  58                 UNEVICTABLE_PGCLEARED,  /* on COW, page truncate */
  59                 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
  60                 UNEVICTABLE_MLOCKFREED,
  61                 NR_VM_EVENT_ITEMS
  62 };
  63
  64 extern int sysctl_stat_interval;
  65
  66 #ifdef CONFIG_VM_EVENT_COUNTERS
  67 /*
  68  * Light weight per cpu counter implementation.
  69  *
  70  * Counters should only be incremented and no critical kernel component
  71  * should rely on the counter values.
  72  *
  73  * Counters are handled completely inline. On many platforms the code
  74  * generated will simply be the increment of a global address.
  75  */
  76
  77 struct vm_event_state {
  78         unsigned long event[NR_VM_EVENT_ITEMS];
  79 };
  80
  81 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  82
  83 static inline void __count_vm_event(enum vm_event_item item)
  84 {
  85         __this_cpu_inc(vm_event_states.event[item]);
  86 }
  87
  88 static inline void count_vm_event(enum vm_event_item item)
  89 {
  90         this_cpu_inc(vm_event_states.event[item]);
  91 }
  92
  93 static inline void __count_vm_events(enum vm_event_item item, long delta)
  94 {
  95         __this_cpu_add(vm_event_states.event[item], delta);
  96 }
  97
  98 static inline void count_vm_events(enum vm_event_item item, long delta)
  99 {
 100         this_cpu_add(vm_event_states.event[item], delta);
 101 }
 102
 103 extern void all_vm_events(unsigned long *);
 104 #ifdef CONFIG_HOTPLUG
 105 extern void vm_events_fold_cpu(int cpu);
 106 #else
 107 static inline void vm_events_fold_cpu(int cpu)
 108 {
 109 }
 110 #endif
 111
 112 #else
 113
 114 /* Disable counters */
 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 __count_vm_event(enum vm_event_item item)
 122 {
 123 }
 124 static inline void __count_vm_events(enum vm_event_item item, long delta)
 125 {
 126 }
 127 static inline void all_vm_events(unsigned long *ret)
 128 {
 129 }
 130 static inline void vm_events_fold_cpu(int cpu)
 131 {
 132 }
 133
 134 #endif /* CONFIG_VM_EVENT_COUNTERS */
 135
 136 #define __count_zone_vm_events(item, zone, delta) \
 137                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 138                 zone_idx(zone), delta)
 139
 140 /*
 141  * Zone based page accounting with per cpu differentials.
 142  */
 143 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 144
 145 static inline void zone_page_state_add(long x, struct zone *zone,
 146                                  enum zone_stat_item item)
 147 {
 148         atomic_long_add(x, &zone->vm_stat[item]);
 149         atomic_long_add(x, &vm_stat[item]);
 150 }
 151
 152 static inline unsigned long global_page_state(enum zone_stat_item item)
 153 {
 154         long x = atomic_long_read(&vm_stat[item]);
 155 #ifdef CONFIG_SMP
 156         if (x < 0)
 157                 x = 0;
 158 #endif
 159         return x;
 160 }
 161
 162 static inline unsigned long zone_page_state(struct zone *zone,
 163                                         enum zone_stat_item item)
 164 {
 165         long x = atomic_long_read(&zone->vm_stat[item]);
 166 #ifdef CONFIG_SMP
 167         if (x < 0)
 168                 x = 0;
 169 #endif
 170         return x;
 171 }
 172
 173 /*
 174  * More accurate version that also considers the currently pending
 175  * deltas. For that we need to loop over all cpus to find the current
 176  * deltas. There is no synchronization so the result cannot be
 177  * exactly accurate either.
 178  */
 179 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 180                                         enum zone_stat_item item)
 181 {
 182         long x = atomic_long_read(&zone->vm_stat[item]);
 183
 184 #ifdef CONFIG_SMP
 185         int cpu;
 186         for_each_online_cpu(cpu)
 187                 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
 188
 189         if (x < 0)
 190                 x = 0;
 191 #endif
 192         return x;
 193 }
 194
 195 extern unsigned long global_reclaimable_pages(void);
 196 extern unsigned long zone_reclaimable_pages(struct zone *zone);
 197
 198 #ifdef CONFIG_NUMA
 199 /*
 200  * Determine the per node value of a stat item. This function
 201  * is called frequently in a NUMA machine, so try to be as
 202  * frugal as possible.
 203  */
 204 static inline unsigned long node_page_state(int node,
 205                                  enum zone_stat_item item)
 206 {
 207         struct zone *zones = NODE_DATA(node)->node_zones;
 208
 209         return
 210 #ifdef CONFIG_ZONE_DMA
 211                 zone_page_state(&zones[ZONE_DMA], item) +
 212 #endif
 213 #ifdef CONFIG_ZONE_DMA32
 214                 zone_page_state(&zones[ZONE_DMA32], item) +
 215 #endif
 216 #ifdef CONFIG_HIGHMEM
 217                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 218 #endif
 219                 zone_page_state(&zones[ZONE_NORMAL], item) +
 220                 zone_page_state(&zones[ZONE_MOVABLE], item);
 221 }
 222
 223 extern void zone_statistics(struct zone *, struct zone *);
 224
 225 #else
 226
 227 #define node_page_state(node, item) global_page_state(item)
 228 #define zone_statistics(_zl,_z) do { } while (0)
 229
 230 #endif /* CONFIG_NUMA */
 231
 232 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 233 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 234
 235 static inline void zap_zone_vm_stats(struct zone *zone)
 236 {
 237         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 238 }
 239
 240 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 241
 242 #ifdef CONFIG_SMP
 243 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 244 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 245 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 246
 247 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 248 void inc_zone_page_state(struct page *, enum zone_stat_item);
 249 void dec_zone_page_state(struct page *, enum zone_stat_item);
 250
 251 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 252 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 253 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 254 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 255
 256 void refresh_cpu_vm_stats(int);
 257 #else /* CONFIG_SMP */
 258
 259 /*
 260  * We do not maintain differentials in a single processor configuration.
 261  * The functions directly modify the zone and global counters.
 262  */
 263 static inline void __mod_zone_page_state(struct zone *zone,
 264                         enum zone_stat_item item, int delta)
 265 {
 266         zone_page_state_add(delta, zone, item);
 267 }
 268
 269 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 270 {
 271         atomic_long_inc(&zone->vm_stat[item]);
 272         atomic_long_inc(&vm_stat[item]);
 273 }
 274
 275 static inline void __inc_zone_page_state(struct page *page,
 276                         enum zone_stat_item item)
 277 {
 278         __inc_zone_state(page_zone(page), item);
 279 }
 280
 281 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 282 {
 283         atomic_long_dec(&zone->vm_stat[item]);
 284         atomic_long_dec(&vm_stat[item]);
 285 }
 286
 287 static inline void __dec_zone_page_state(struct page *page,
 288                         enum zone_stat_item item)
 289 {
 290         __dec_zone_state(page_zone(page), item);
 291 }
 292
 293 /*
 294  * We only use atomic operations to update counters. So there is no need to
 295  * disable interrupts.
 296  */
 297 #define inc_zone_page_state __inc_zone_page_state
 298 #define dec_zone_page_state __dec_zone_page_state
 299 #define mod_zone_page_state __mod_zone_page_state
 300
 301 static inline void refresh_cpu_vm_stats(int cpu) { }
 302 #endif
 303
 304 #endif /* _LINUX_VMSTAT_H */