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                 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
  40                 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
  41 #ifdef CONFIG_HUGETLB_PAGE
  42                 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
  43 #endif
  44 #ifdef CONFIG_UNEVICTABLE_LRU
  45                 UNEVICTABLE_PGCULLED,   /* culled to noreclaim list */
  46                 UNEVICTABLE_PGSCANNED,  /* scanned for reclaimability */
  47                 UNEVICTABLE_PGRESCUED,  /* rescued from noreclaim list */
  48                 UNEVICTABLE_PGMLOCKED,
  49                 UNEVICTABLE_PGMUNLOCKED,
  50                 UNEVICTABLE_PGCLEARED,  /* on COW, page truncate */
  51                 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
  52                 UNEVICTABLE_MLOCKFREED,
  53 #endif
  54                 NR_VM_EVENT_ITEMS
  55 };
  56
  57 extern int sysctl_stat_interval;
  58
  59 #ifdef CONFIG_VM_EVENT_COUNTERS
  60 /*
  61  * Light weight per cpu counter implementation.
  62  *
  63  * Counters should only be incremented and no critical kernel component
  64  * should rely on the counter values.
  65  *
  66  * Counters are handled completely inline. On many platforms the code
  67  * generated will simply be the increment of a global address.
  68  */
  69
  70 struct vm_event_state {
  71         unsigned long event[NR_VM_EVENT_ITEMS];
  72 };
  73
  74 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  75
  76 static inline void __count_vm_event(enum vm_event_item item)
  77 {
  78         __get_cpu_var(vm_event_states).event[item]++;
  79 }
  80
  81 static inline void count_vm_event(enum vm_event_item item)
  82 {
  83         get_cpu_var(vm_event_states).event[item]++;
  84         put_cpu();
  85 }
  86
  87 static inline void __count_vm_events(enum vm_event_item item, long delta)
  88 {
  89         __get_cpu_var(vm_event_states).event[item] += delta;
  90 }
  91
  92 static inline void count_vm_events(enum vm_event_item item, long delta)
  93 {
  94         get_cpu_var(vm_event_states).event[item] += delta;
  95         put_cpu();
  96 }
  97
  98 extern void all_vm_events(unsigned long *);
  99 #ifdef CONFIG_HOTPLUG
 100 extern void vm_events_fold_cpu(int cpu);
 101 #else
 102 static inline void vm_events_fold_cpu(int cpu)
 103 {
 104 }
 105 #endif
 106
 107 #else
 108
 109 /* Disable counters */
 110 static inline void count_vm_event(enum vm_event_item item)
 111 {
 112 }
 113 static inline void count_vm_events(enum vm_event_item item, long delta)
 114 {
 115 }
 116 static inline void __count_vm_event(enum vm_event_item item)
 117 {
 118 }
 119 static inline void __count_vm_events(enum vm_event_item item, long delta)
 120 {
 121 }
 122 static inline void all_vm_events(unsigned long *ret)
 123 {
 124 }
 125 static inline void vm_events_fold_cpu(int cpu)
 126 {
 127 }
 128
 129 #endif /* CONFIG_VM_EVENT_COUNTERS */
 130
 131 #define __count_zone_vm_events(item, zone, delta) \
 132                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 133                 zone_idx(zone), delta)
 134
 135 /*
 136  * Zone based page accounting with per cpu differentials.
 137  */
 138 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 139
 140 static inline void zone_page_state_add(long x, struct zone *zone,
 141                                  enum zone_stat_item item)
 142 {
 143         atomic_long_add(x, &zone->vm_stat[item]);
 144         atomic_long_add(x, &vm_stat[item]);
 145 }
 146
 147 static inline unsigned long global_page_state(enum zone_stat_item item)
 148 {
 149         long x = atomic_long_read(&vm_stat[item]);
 150 #ifdef CONFIG_SMP
 151         if (x < 0)
 152                 x = 0;
 153 #endif
 154         return x;
 155 }
 156
 157 static inline unsigned long zone_page_state(struct zone *zone,
 158                                         enum zone_stat_item item)
 159 {
 160         long x = atomic_long_read(&zone->vm_stat[item]);
 161 #ifdef CONFIG_SMP
 162         if (x < 0)
 163                 x = 0;
 164 #endif
 165         return x;
 166 }
 167
 168 extern unsigned long global_lru_pages(void);
 169
 170 static inline unsigned long zone_lru_pages(struct zone *zone)
 171 {
 172         return (zone_page_state(zone, NR_ACTIVE_ANON)
 173                 + zone_page_state(zone, NR_ACTIVE_FILE)
 174                 + zone_page_state(zone, NR_INACTIVE_ANON)
 175                 + zone_page_state(zone, NR_INACTIVE_FILE));
 176 }
 177
 178 #ifdef CONFIG_NUMA
 179 /*
 180  * Determine the per node value of a stat item. This function
 181  * is called frequently in a NUMA machine, so try to be as
 182  * frugal as possible.
 183  */
 184 static inline unsigned long node_page_state(int node,
 185                                  enum zone_stat_item item)
 186 {
 187         struct zone *zones = NODE_DATA(node)->node_zones;
 188
 189         return
 190 #ifdef CONFIG_ZONE_DMA
 191                 zone_page_state(&zones[ZONE_DMA], item) +
 192 #endif
 193 #ifdef CONFIG_ZONE_DMA32
 194                 zone_page_state(&zones[ZONE_DMA32], item) +
 195 #endif
 196 #ifdef CONFIG_HIGHMEM
 197                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 198 #endif
 199                 zone_page_state(&zones[ZONE_NORMAL], item) +
 200                 zone_page_state(&zones[ZONE_MOVABLE], item);
 201 }
 202
 203 extern void zone_statistics(struct zone *, struct zone *);
 204
 205 #else
 206
 207 #define node_page_state(node, item) global_page_state(item)
 208 #define zone_statistics(_zl,_z) do { } while (0)
 209
 210 #endif /* CONFIG_NUMA */
 211
 212 #define __add_zone_page_state(__z, __i, __d)    \
 213                 __mod_zone_page_state(__z, __i, __d)
 214 #define __sub_zone_page_state(__z, __i, __d)    \
 215                 __mod_zone_page_state(__z, __i,-(__d))
 216
 217 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 218 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 219
 220 static inline void zap_zone_vm_stats(struct zone *zone)
 221 {
 222         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 223 }
 224
 225 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 226
 227 #ifdef CONFIG_SMP
 228 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 229 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 230 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 231
 232 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 233 void inc_zone_page_state(struct page *, enum zone_stat_item);
 234 void dec_zone_page_state(struct page *, enum zone_stat_item);
 235
 236 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 237 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 238 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 239 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 240
 241 void refresh_cpu_vm_stats(int);
 242 #else /* CONFIG_SMP */
 243
 244 /*
 245  * We do not maintain differentials in a single processor configuration.
 246  * The functions directly modify the zone and global counters.
 247  */
 248 static inline void __mod_zone_page_state(struct zone *zone,
 249                         enum zone_stat_item item, int delta)
 250 {
 251         zone_page_state_add(delta, zone, item);
 252 }
 253
 254 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 255 {
 256         atomic_long_inc(&zone->vm_stat[item]);
 257         atomic_long_inc(&vm_stat[item]);
 258 }
 259
 260 static inline void __inc_zone_page_state(struct page *page,
 261                         enum zone_stat_item item)
 262 {
 263         __inc_zone_state(page_zone(page), item);
 264 }
 265
 266 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 267 {
 268         atomic_long_dec(&zone->vm_stat[item]);
 269         atomic_long_dec(&vm_stat[item]);
 270 }
 271
 272 static inline void __dec_zone_page_state(struct page *page,
 273                         enum zone_stat_item item)
 274 {
 275         __dec_zone_state(page_zone(page), item);
 276 }
 277
 278 /*
 279  * We only use atomic operations to update counters. So there is no need to
 280  * disable interrupts.
 281  */
 282 #define inc_zone_page_state __inc_zone_page_state
 283 #define dec_zone_page_state __dec_zone_page_state
 284 #define mod_zone_page_state __mod_zone_page_state
 285
 286 static inline void refresh_cpu_vm_stats(int cpu) { }
 287 #endif
 288
 289 #endif /* _LINUX_VMSTAT_H */