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 #ifdef CONFIG_PREEMPT_RT
  79         get_cpu_var(vm_event_states).event[item]++;
  80         put_cpu();
  81 #else
  82         __get_cpu_var(vm_event_states).event[item]++;
  83 #endif
  84 }
  85
  86 static inline void count_vm_event(enum vm_event_item item)
  87 {
  88         get_cpu_var(vm_event_states).event[item]++;
  89         put_cpu();
  90 }
  91
  92 static inline void __count_vm_events(enum vm_event_item item, long delta)
  93 {
  94 #ifdef CONFIG_PREEMPT_RT
  95         get_cpu_var(vm_event_states).event[item] += delta;
  96         put_cpu();
  97 #else
  98         __get_cpu_var(vm_event_states).event[item] += delta;
  99 #endif
 100 }
 101
 102 static inline void count_vm_events(enum vm_event_item item, long delta)
 103 {
 104         get_cpu_var(vm_event_states).event[item] += delta;
 105         put_cpu();
 106 }
 107
 108 extern void all_vm_events(unsigned long *);
 109 #ifdef CONFIG_HOTPLUG
 110 extern void vm_events_fold_cpu(int cpu);
 111 #else
 112 static inline void vm_events_fold_cpu(int cpu)
 113 {
 114 }
 115 #endif
 116
 117 #else
 118
 119 /* Disable counters */
 120 static inline void count_vm_event(enum vm_event_item item)
 121 {
 122 }
 123 static inline void count_vm_events(enum vm_event_item item, long delta)
 124 {
 125 }
 126 static inline void __count_vm_event(enum vm_event_item item)
 127 {
 128 }
 129 static inline void __count_vm_events(enum vm_event_item item, long delta)
 130 {
 131 }
 132 static inline void all_vm_events(unsigned long *ret)
 133 {
 134 }
 135 static inline void vm_events_fold_cpu(int cpu)
 136 {
 137 }
 138
 139 #endif /* CONFIG_VM_EVENT_COUNTERS */
 140
 141 #define __count_zone_vm_events(item, zone, delta) \
 142                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 143                 zone_idx(zone), delta)
 144
 145 /*
 146  * Zone based page accounting with per cpu differentials.
 147  */
 148 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 149
 150 static inline void zone_page_state_add(long x, struct zone *zone,
 151                                  enum zone_stat_item item)
 152 {
 153         atomic_long_add(x, &zone->vm_stat[item]);
 154         atomic_long_add(x, &vm_stat[item]);
 155 }
 156
 157 static inline unsigned long global_page_state(enum zone_stat_item item)
 158 {
 159         long x = atomic_long_read(&vm_stat[item]);
 160 #ifdef CONFIG_SMP
 161         if (x < 0)
 162                 x = 0;
 163 #endif
 164         return x;
 165 }
 166
 167 static inline unsigned long zone_page_state(struct zone *zone,
 168                                         enum zone_stat_item item)
 169 {
 170         long x = atomic_long_read(&zone->vm_stat[item]);
 171 #ifdef CONFIG_SMP
 172         if (x < 0)
 173                 x = 0;
 174 #endif
 175         return x;
 176 }
 177
 178 extern unsigned long global_lru_pages(void);
 179
 180 static inline unsigned long zone_lru_pages(struct zone *zone)
 181 {
 182         return (zone_page_state(zone, NR_ACTIVE_ANON)
 183                 + zone_page_state(zone, NR_ACTIVE_FILE)
 184                 + zone_page_state(zone, NR_INACTIVE_ANON)
 185                 + zone_page_state(zone, NR_INACTIVE_FILE));
 186 }
 187
 188 #ifdef CONFIG_NUMA
 189 /*
 190  * Determine the per node value of a stat item. This function
 191  * is called frequently in a NUMA machine, so try to be as
 192  * frugal as possible.
 193  */
 194 static inline unsigned long node_page_state(int node,
 195                                  enum zone_stat_item item)
 196 {
 197         struct zone *zones = NODE_DATA(node)->node_zones;
 198
 199         return
 200 #ifdef CONFIG_ZONE_DMA
 201                 zone_page_state(&zones[ZONE_DMA], item) +
 202 #endif
 203 #ifdef CONFIG_ZONE_DMA32
 204                 zone_page_state(&zones[ZONE_DMA32], item) +
 205 #endif
 206 #ifdef CONFIG_HIGHMEM
 207                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 208 #endif
 209                 zone_page_state(&zones[ZONE_NORMAL], item) +
 210                 zone_page_state(&zones[ZONE_MOVABLE], item);
 211 }
 212
 213 extern void zone_statistics(struct zone *, struct zone *);
 214
 215 #else
 216
 217 #define node_page_state(node, item) global_page_state(item)
 218 #define zone_statistics(_zl,_z) do { } while (0)
 219
 220 #endif /* CONFIG_NUMA */
 221
 222 #define __add_zone_page_state(__z, __i, __d)    \
 223                 __mod_zone_page_state(__z, __i, __d)
 224 #define __sub_zone_page_state(__z, __i, __d)    \
 225                 __mod_zone_page_state(__z, __i,-(__d))
 226
 227 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 228 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 229
 230 static inline void zap_zone_vm_stats(struct zone *zone)
 231 {
 232         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 233 }
 234
 235 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 236
 237 #ifdef CONFIG_SMP
 238 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 239 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 240 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 241
 242 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 243 void inc_zone_page_state(struct page *, enum zone_stat_item);
 244 void dec_zone_page_state(struct page *, enum zone_stat_item);
 245
 246 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 247 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 248 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 249 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 250
 251 void refresh_cpu_vm_stats(int);
 252 #else /* CONFIG_SMP */
 253
 254 /*
 255  * We do not maintain differentials in a single processor configuration.
 256  * The functions directly modify the zone and global counters.
 257  */
 258 static inline void __mod_zone_page_state(struct zone *zone,
 259                         enum zone_stat_item item, int delta)
 260 {
 261         zone_page_state_add(delta, zone, item);
 262 }
 263
 264 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 265 {
 266         atomic_long_inc(&zone->vm_stat[item]);
 267         atomic_long_inc(&vm_stat[item]);
 268 }
 269
 270 static inline void __inc_zone_page_state(struct page *page,
 271                         enum zone_stat_item item)
 272 {
 273         __inc_zone_state(page_zone(page), item);
 274 }
 275
 276 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 277 {
 278         atomic_long_dec(&zone->vm_stat[item]);
 279         atomic_long_dec(&vm_stat[item]);
 280 }
 281
 282 static inline void __dec_zone_page_state(struct page *page,
 283                         enum zone_stat_item item)
 284 {
 285         __dec_zone_state(page_zone(page), item);
 286 }
 287
 288 /*
 289  * We only use atomic operations to update counters. So there is no need to
 290  * disable interrupts.
 291  */
 292 #define inc_zone_page_state __inc_zone_page_state
 293 #define dec_zone_page_state __dec_zone_page_state
 294 #define mod_zone_page_state __mod_zone_page_state
 295
 296 static inline void refresh_cpu_vm_stats(int cpu) { }
 297 #endif
 298
 299 #endif /* _LINUX_VMSTAT_H */