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 extern unsigned long global_lru_pages(void);
 170
 171 static inline unsigned long zone_lru_pages(struct zone *zone)
 172 {
 173         return (zone_page_state(zone, NR_ACTIVE_ANON)
 174                 + zone_page_state(zone, NR_ACTIVE_FILE)
 175                 + zone_page_state(zone, NR_INACTIVE_ANON)
 176                 + zone_page_state(zone, NR_INACTIVE_FILE));
 177 }
 178
 179 #ifdef CONFIG_NUMA
 180 /*
 181  * Determine the per node value of a stat item. This function
 182  * is called frequently in a NUMA machine, so try to be as
 183  * frugal as possible.
 184  */
 185 static inline unsigned long node_page_state(int node,
 186                                  enum zone_stat_item item)
 187 {
 188         struct zone *zones = NODE_DATA(node)->node_zones;
 189
 190         return
 191 #ifdef CONFIG_ZONE_DMA
 192                 zone_page_state(&zones[ZONE_DMA], item) +
 193 #endif
 194 #ifdef CONFIG_ZONE_DMA32
 195                 zone_page_state(&zones[ZONE_DMA32], item) +
 196 #endif
 197 #ifdef CONFIG_HIGHMEM
 198                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 199 #endif
 200                 zone_page_state(&zones[ZONE_NORMAL], item) +
 201                 zone_page_state(&zones[ZONE_MOVABLE], item);
 202 }
 203
 204 extern void zone_statistics(struct zone *, struct zone *);
 205
 206 #else
 207
 208 #define node_page_state(node, item) global_page_state(item)
 209 #define zone_statistics(_zl,_z) do { } while (0)
 210
 211 #endif /* CONFIG_NUMA */
 212
 213 #define __add_zone_page_state(__z, __i, __d)    \
 214                 __mod_zone_page_state(__z, __i, __d)
 215 #define __sub_zone_page_state(__z, __i, __d)    \
 216                 __mod_zone_page_state(__z, __i,-(__d))
 217
 218 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 219 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 220
 221 static inline void zap_zone_vm_stats(struct zone *zone)
 222 {
 223         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 224 }
 225
 226 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 227
 228 #ifdef CONFIG_SMP
 229 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 230 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 231 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 232
 233 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 234 void inc_zone_page_state(struct page *, enum zone_stat_item);
 235 void dec_zone_page_state(struct page *, enum zone_stat_item);
 236
 237 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 238 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 239 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 240 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 241
 242 void refresh_cpu_vm_stats(int);
 243 #else /* CONFIG_SMP */
 244
 245 /*
 246  * We do not maintain differentials in a single processor configuration.
 247  * The functions directly modify the zone and global counters.
 248  */
 249 static inline void __mod_zone_page_state(struct zone *zone,
 250                         enum zone_stat_item item, int delta)
 251 {
 252         zone_page_state_add(delta, zone, item);
 253 }
 254
 255 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 256 {
 257         atomic_long_inc(&zone->vm_stat[item]);
 258         atomic_long_inc(&vm_stat[item]);
 259 }
 260
 261 static inline void __inc_zone_page_state(struct page *page,
 262                         enum zone_stat_item item)
 263 {
 264         __inc_zone_state(page_zone(page), item);
 265 }
 266
 267 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 268 {
 269         atomic_long_dec(&zone->vm_stat[item]);
 270         atomic_long_dec(&vm_stat[item]);
 271 }
 272
 273 static inline void __dec_zone_page_state(struct page *page,
 274                         enum zone_stat_item item)
 275 {
 276         __dec_zone_state(page_zone(page), item);
 277 }
 278
 279 /*
 280  * We only use atomic operations to update counters. So there is no need to
 281  * disable interrupts.
 282  */
 283 #define inc_zone_page_state __inc_zone_page_state
 284 #define dec_zone_page_state __dec_zone_page_state
 285 #define mod_zone_page_state __mod_zone_page_state
 286
 287 static inline void refresh_cpu_vm_stats(int cpu) { }
 288 #endif
 289
 290 #endif /* _LINUX_VMSTAT_H */