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 #ifdef CONFIG_UNEVICTABLE_LRU
  48                 UNEVICTABLE_PGCULLED,   /* culled to noreclaim list */
  49                 UNEVICTABLE_PGSCANNED,  /* scanned for reclaimability */
  50                 UNEVICTABLE_PGRESCUED,  /* rescued from noreclaim list */
  51                 UNEVICTABLE_PGMLOCKED,
  52                 UNEVICTABLE_PGMUNLOCKED,
  53                 UNEVICTABLE_PGCLEARED,  /* on COW, page truncate */
  54                 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
  55                 UNEVICTABLE_MLOCKFREED,
  56 #endif
  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         __get_cpu_var(vm_event_states).event[item]++;
  82 }
  83
  84 static inline void count_vm_event(enum vm_event_item item)
  85 {
  86         get_cpu_var(vm_event_states).event[item]++;
  87         put_cpu();
  88 }
  89
  90 static inline void __count_vm_events(enum vm_event_item item, long delta)
  91 {
  92         __get_cpu_var(vm_event_states).event[item] += delta;
  93 }
  94
  95 static inline void count_vm_events(enum vm_event_item item, long delta)
  96 {
  97         get_cpu_var(vm_event_states).event[item] += delta;
  98         put_cpu();
  99 }
 100
 101 extern void all_vm_events(unsigned long *);
 102 #ifdef CONFIG_HOTPLUG
 103 extern void vm_events_fold_cpu(int cpu);
 104 #else
 105 static inline void vm_events_fold_cpu(int cpu)
 106 {
 107 }
 108 #endif
 109
 110 #else
 111
 112 /* Disable counters */
 113 static inline void count_vm_event(enum vm_event_item item)
 114 {
 115 }
 116 static inline void count_vm_events(enum vm_event_item item, long delta)
 117 {
 118 }
 119 static inline void __count_vm_event(enum vm_event_item item)
 120 {
 121 }
 122 static inline void __count_vm_events(enum vm_event_item item, long delta)
 123 {
 124 }
 125 static inline void all_vm_events(unsigned long *ret)
 126 {
 127 }
 128 static inline void vm_events_fold_cpu(int cpu)
 129 {
 130 }
 131
 132 #endif /* CONFIG_VM_EVENT_COUNTERS */
 133
 134 #define __count_zone_vm_events(item, zone, delta) \
 135                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 136                 zone_idx(zone), delta)
 137
 138 /*
 139  * Zone based page accounting with per cpu differentials.
 140  */
 141 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 142
 143 static inline void zone_page_state_add(long x, struct zone *zone,
 144                                  enum zone_stat_item item)
 145 {
 146         atomic_long_add(x, &zone->vm_stat[item]);
 147         atomic_long_add(x, &vm_stat[item]);
 148 }
 149
 150 static inline unsigned long global_page_state(enum zone_stat_item item)
 151 {
 152         long x = atomic_long_read(&vm_stat[item]);
 153 #ifdef CONFIG_SMP
 154         if (x < 0)
 155                 x = 0;
 156 #endif
 157         return x;
 158 }
 159
 160 static inline unsigned long zone_page_state(struct zone *zone,
 161                                         enum zone_stat_item item)
 162 {
 163         long x = atomic_long_read(&zone->vm_stat[item]);
 164 #ifdef CONFIG_SMP
 165         if (x < 0)
 166                 x = 0;
 167 #endif
 168         return x;
 169 }
 170
 171 extern unsigned long global_lru_pages(void);
 172
 173 static inline unsigned long zone_lru_pages(struct zone *zone)
 174 {
 175         return (zone_page_state(zone, NR_ACTIVE_ANON)
 176                 + zone_page_state(zone, NR_ACTIVE_FILE)
 177                 + zone_page_state(zone, NR_INACTIVE_ANON)
 178                 + zone_page_state(zone, NR_INACTIVE_FILE));
 179 }
 180
 181 #ifdef CONFIG_NUMA
 182 /*
 183  * Determine the per node value of a stat item. This function
 184  * is called frequently in a NUMA machine, so try to be as
 185  * frugal as possible.
 186  */
 187 static inline unsigned long node_page_state(int node,
 188                                  enum zone_stat_item item)
 189 {
 190         struct zone *zones = NODE_DATA(node)->node_zones;
 191
 192         return
 193 #ifdef CONFIG_ZONE_DMA
 194                 zone_page_state(&zones[ZONE_DMA], item) +
 195 #endif
 196 #ifdef CONFIG_ZONE_DMA32
 197                 zone_page_state(&zones[ZONE_DMA32], item) +
 198 #endif
 199 #ifdef CONFIG_HIGHMEM
 200                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 201 #endif
 202                 zone_page_state(&zones[ZONE_NORMAL], item) +
 203                 zone_page_state(&zones[ZONE_MOVABLE], item);
 204 }
 205
 206 extern void zone_statistics(struct zone *, struct zone *);
 207
 208 #else
 209
 210 #define node_page_state(node, item) global_page_state(item)
 211 #define zone_statistics(_zl,_z) do { } while (0)
 212
 213 #endif /* CONFIG_NUMA */
 214
 215 #define __add_zone_page_state(__z, __i, __d)    \
 216                 __mod_zone_page_state(__z, __i, __d)
 217 #define __sub_zone_page_state(__z, __i, __d)    \
 218                 __mod_zone_page_state(__z, __i,-(__d))
 219
 220 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 221 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 222
 223 static inline void zap_zone_vm_stats(struct zone *zone)
 224 {
 225         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 226 }
 227
 228 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 229
 230 #ifdef CONFIG_SMP
 231 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 232 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 233 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 234
 235 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 236 void inc_zone_page_state(struct page *, enum zone_stat_item);
 237 void dec_zone_page_state(struct page *, enum zone_stat_item);
 238
 239 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 240 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 241 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 242 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 243
 244 void refresh_cpu_vm_stats(int);
 245 #else /* CONFIG_SMP */
 246
 247 /*
 248  * We do not maintain differentials in a single processor configuration.
 249  * The functions directly modify the zone and global counters.
 250  */
 251 static inline void __mod_zone_page_state(struct zone *zone,
 252                         enum zone_stat_item item, int delta)
 253 {
 254         zone_page_state_add(delta, zone, item);
 255 }
 256
 257 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 258 {
 259         atomic_long_inc(&zone->vm_stat[item]);
 260         atomic_long_inc(&vm_stat[item]);
 261 }
 262
 263 static inline void __inc_zone_page_state(struct page *page,
 264                         enum zone_stat_item item)
 265 {
 266         __inc_zone_state(page_zone(page), item);
 267 }
 268
 269 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 270 {
 271         atomic_long_dec(&zone->vm_stat[item]);
 272         atomic_long_dec(&vm_stat[item]);
 273 }
 274
 275 static inline void __dec_zone_page_state(struct page *page,
 276                         enum zone_stat_item item)
 277 {
 278         __dec_zone_state(page_zone(page), item);
 279 }
 280
 281 /*
 282  * We only use atomic operations to update counters. So there is no need to
 283  * disable interrupts.
 284  */
 285 #define inc_zone_page_state __inc_zone_page_state
 286 #define dec_zone_page_state __dec_zone_page_state
 287 #define mod_zone_page_state __mod_zone_page_state
 288
 289 static inline void refresh_cpu_vm_stats(int cpu) { }
 290 #endif
 291
 292 #endif /* _LINUX_VMSTAT_H */