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         __get_cpu_var(vm_event_states).event[item]++;
  80 }
  81
  82 static inline void count_vm_event(enum vm_event_item item)
  83 {
  84         get_cpu_var(vm_event_states).event[item]++;
  85         put_cpu();
  86 }
  87
  88 static inline void __count_vm_events(enum vm_event_item item, long delta)
  89 {
  90         __get_cpu_var(vm_event_states).event[item] += delta;
  91 }
  92
  93 static inline void count_vm_events(enum vm_event_item item, long delta)
  94 {
  95         get_cpu_var(vm_event_states).event[item] += delta;
  96         put_cpu();
  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 /*
 170  * More accurate version that also considers the currently pending
 171  * deltas. For that we need to loop over all cpus to find the current
 172  * deltas. There is no synchronization so the result cannot be
 173  * exactly accurate either.
 174  */
 175 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 176                                         enum zone_stat_item item)
 177 {
 178         long x = atomic_long_read(&zone->vm_stat[item]);
 179
 180 #ifdef CONFIG_SMP
 181         int cpu;
 182         for_each_online_cpu(cpu)
 183                 x += zone_pcp(zone, cpu)->vm_stat_diff[item];
 184
 185         if (x < 0)
 186                 x = 0;
 187 #endif
 188         return x;
 189 }
 190
 191 extern unsigned long global_reclaimable_pages(void);
 192 extern unsigned long zone_reclaimable_pages(struct zone *zone);
 193
 194 #ifdef CONFIG_NUMA
 195 /*
 196  * Determine the per node value of a stat item. This function
 197  * is called frequently in a NUMA machine, so try to be as
 198  * frugal as possible.
 199  */
 200 static inline unsigned long node_page_state(int node,
 201                                  enum zone_stat_item item)
 202 {
 203         struct zone *zones = NODE_DATA(node)->node_zones;
 204
 205         return
 206 #ifdef CONFIG_ZONE_DMA
 207                 zone_page_state(&zones[ZONE_DMA], item) +
 208 #endif
 209 #ifdef CONFIG_ZONE_DMA32
 210                 zone_page_state(&zones[ZONE_DMA32], item) +
 211 #endif
 212 #ifdef CONFIG_HIGHMEM
 213                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 214 #endif
 215                 zone_page_state(&zones[ZONE_NORMAL], item) +
 216                 zone_page_state(&zones[ZONE_MOVABLE], item);
 217 }
 218
 219 extern void zone_statistics(struct zone *, struct zone *);
 220
 221 #else
 222
 223 #define node_page_state(node, item) global_page_state(item)
 224 #define zone_statistics(_zl,_z) do { } while (0)
 225
 226 #endif /* CONFIG_NUMA */
 227
 228 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 229 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 230
 231 static inline void zap_zone_vm_stats(struct zone *zone)
 232 {
 233         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 234 }
 235
 236 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 237
 238 #ifdef CONFIG_SMP
 239 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 240 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 241 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 242
 243 void mod_zone_page_state(struct zone *, enum zone_stat_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 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 248 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 249 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 250 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 251
 252 void refresh_cpu_vm_stats(int);
 253 #else /* CONFIG_SMP */
 254
 255 /*
 256  * We do not maintain differentials in a single processor configuration.
 257  * The functions directly modify the zone and global counters.
 258  */
 259 static inline void __mod_zone_page_state(struct zone *zone,
 260                         enum zone_stat_item item, int delta)
 261 {
 262         zone_page_state_add(delta, zone, item);
 263 }
 264
 265 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 266 {
 267         atomic_long_inc(&zone->vm_stat[item]);
 268         atomic_long_inc(&vm_stat[item]);
 269 }
 270
 271 static inline void __inc_zone_page_state(struct page *page,
 272                         enum zone_stat_item item)
 273 {
 274         __inc_zone_state(page_zone(page), item);
 275 }
 276
 277 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 278 {
 279         atomic_long_dec(&zone->vm_stat[item]);
 280         atomic_long_dec(&vm_stat[item]);
 281 }
 282
 283 static inline void __dec_zone_page_state(struct page *page,
 284                         enum zone_stat_item item)
 285 {
 286         __dec_zone_state(page_zone(page), item);
 287 }
 288
 289 /*
 290  * We only use atomic operations to update counters. So there is no need to
 291  * disable interrupts.
 292  */
 293 #define inc_zone_page_state __inc_zone_page_state
 294 #define dec_zone_page_state __dec_zone_page_state
 295 #define mod_zone_page_state __mod_zone_page_state
 296
 297 static inline void refresh_cpu_vm_stats(int cpu) { }
 298 #endif
 299
 300 #endif /* _LINUX_VMSTAT_H */