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                 KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY,
  44                 KSWAPD_SKIP_CONGESTION_WAIT,
  45                 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
  46 #ifdef CONFIG_COMPACTION
  47                 COMPACTBLOCKS, COMPACTPAGES, COMPACTPAGEFAILED,
  48                 COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,
  49 #endif
  50 #ifdef CONFIG_HUGETLB_PAGE
  51                 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
  52 #endif
  53                 UNEVICTABLE_PGCULLED,   /* culled to noreclaim list */
  54                 UNEVICTABLE_PGSCANNED,  /* scanned for reclaimability */
  55                 UNEVICTABLE_PGRESCUED,  /* rescued from noreclaim list */
  56                 UNEVICTABLE_PGMLOCKED,
  57                 UNEVICTABLE_PGMUNLOCKED,
  58                 UNEVICTABLE_PGCLEARED,  /* on COW, page truncate */
  59                 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
  60                 UNEVICTABLE_MLOCKFREED,
  61 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  62                 THP_FAULT_ALLOC,
  63                 THP_FAULT_FALLBACK,
  64                 THP_COLLAPSE_ALLOC,
  65                 THP_COLLAPSE_ALLOC_FAILED,
  66                 THP_SPLIT,
  67 #endif
  68                 NR_VM_EVENT_ITEMS
  69 };
  70
  71 extern int sysctl_stat_interval;
  72
  73 #ifdef CONFIG_VM_EVENT_COUNTERS
  74 /*
  75  * Light weight per cpu counter implementation.
  76  *
  77  * Counters should only be incremented and no critical kernel component
  78  * should rely on the counter values.
  79  *
  80  * Counters are handled completely inline. On many platforms the code
  81  * generated will simply be the increment of a global address.
  82  */
  83
  84 struct vm_event_state {
  85         unsigned long event[NR_VM_EVENT_ITEMS];
  86 };
  87
  88 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  89
  90 static inline void __count_vm_event(enum vm_event_item item)
  91 {
  92         __this_cpu_inc(vm_event_states.event[item]);
  93 }
  94
  95 static inline void count_vm_event(enum vm_event_item item)
  96 {
  97         this_cpu_inc(vm_event_states.event[item]);
  98 }
  99
 100 static inline void __count_vm_events(enum vm_event_item item, long delta)
 101 {
 102         __this_cpu_add(vm_event_states.event[item], delta);
 103 }
 104
 105 static inline void count_vm_events(enum vm_event_item item, long delta)
 106 {
 107         this_cpu_add(vm_event_states.event[item], delta);
 108 }
 109
 110 extern void all_vm_events(unsigned long *);
 111 #ifdef CONFIG_HOTPLUG
 112 extern void vm_events_fold_cpu(int cpu);
 113 #else
 114 static inline void vm_events_fold_cpu(int cpu)
 115 {
 116 }
 117 #endif
 118
 119 #else
 120
 121 /* Disable counters */
 122 static inline void count_vm_event(enum vm_event_item item)
 123 {
 124 }
 125 static inline void count_vm_events(enum vm_event_item item, long delta)
 126 {
 127 }
 128 static inline void __count_vm_event(enum vm_event_item item)
 129 {
 130 }
 131 static inline void __count_vm_events(enum vm_event_item item, long delta)
 132 {
 133 }
 134 static inline void all_vm_events(unsigned long *ret)
 135 {
 136 }
 137 static inline void vm_events_fold_cpu(int cpu)
 138 {
 139 }
 140
 141 #endif /* CONFIG_VM_EVENT_COUNTERS */
 142
 143 #define __count_zone_vm_events(item, zone, delta) \
 144                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 145                 zone_idx(zone), delta)
 146
 147 /*
 148  * Zone based page accounting with per cpu differentials.
 149  */
 150 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 151
 152 static inline void zone_page_state_add(long x, struct zone *zone,
 153                                  enum zone_stat_item item)
 154 {
 155         atomic_long_add(x, &zone->vm_stat[item]);
 156         atomic_long_add(x, &vm_stat[item]);
 157 }
 158
 159 static inline unsigned long global_page_state(enum zone_stat_item item)
 160 {
 161         long x = atomic_long_read(&vm_stat[item]);
 162 #ifdef CONFIG_SMP
 163         if (x < 0)
 164                 x = 0;
 165 #endif
 166         return x;
 167 }
 168
 169 static inline unsigned long zone_page_state(struct zone *zone,
 170                                         enum zone_stat_item item)
 171 {
 172         long x = atomic_long_read(&zone->vm_stat[item]);
 173 #ifdef CONFIG_SMP
 174         if (x < 0)
 175                 x = 0;
 176 #endif
 177         return x;
 178 }
 179
 180 /*
 181  * More accurate version that also considers the currently pending
 182  * deltas. For that we need to loop over all cpus to find the current
 183  * deltas. There is no synchronization so the result cannot be
 184  * exactly accurate either.
 185  */
 186 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 187                                         enum zone_stat_item item)
 188 {
 189         long x = atomic_long_read(&zone->vm_stat[item]);
 190
 191 #ifdef CONFIG_SMP
 192         int cpu;
 193         for_each_online_cpu(cpu)
 194                 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
 195
 196         if (x < 0)
 197                 x = 0;
 198 #endif
 199         return x;
 200 }
 201
 202 extern unsigned long global_reclaimable_pages(void);
 203 extern unsigned long zone_reclaimable_pages(struct zone *zone);
 204
 205 #ifdef CONFIG_NUMA
 206 /*
 207  * Determine the per node value of a stat item. This function
 208  * is called frequently in a NUMA machine, so try to be as
 209  * frugal as possible.
 210  */
 211 static inline unsigned long node_page_state(int node,
 212                                  enum zone_stat_item item)
 213 {
 214         struct zone *zones = NODE_DATA(node)->node_zones;
 215
 216         return
 217 #ifdef CONFIG_ZONE_DMA
 218                 zone_page_state(&zones[ZONE_DMA], item) +
 219 #endif
 220 #ifdef CONFIG_ZONE_DMA32
 221                 zone_page_state(&zones[ZONE_DMA32], item) +
 222 #endif
 223 #ifdef CONFIG_HIGHMEM
 224                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 225 #endif
 226                 zone_page_state(&zones[ZONE_NORMAL], item) +
 227                 zone_page_state(&zones[ZONE_MOVABLE], item);
 228 }
 229
 230 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
 231
 232 #else
 233
 234 #define node_page_state(node, item) global_page_state(item)
 235 #define zone_statistics(_zl, _z, gfp) do { } while (0)
 236
 237 #endif /* CONFIG_NUMA */
 238
 239 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 240 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 241
 242 static inline void zap_zone_vm_stats(struct zone *zone)
 243 {
 244         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 245 }
 246
 247 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 248
 249 #ifdef CONFIG_SMP
 250 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 251 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 252 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 253
 254 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 255 void inc_zone_page_state(struct page *, enum zone_stat_item);
 256 void dec_zone_page_state(struct page *, enum zone_stat_item);
 257
 258 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 259 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 260 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 261 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 262
 263 void refresh_cpu_vm_stats(int);
 264
 265 int calculate_pressure_threshold(struct zone *zone);
 266 int calculate_normal_threshold(struct zone *zone);
 267 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
 268                                 int (*calculate_pressure)(struct zone *));
 269 #else /* CONFIG_SMP */
 270
 271 /*
 272  * We do not maintain differentials in a single processor configuration.
 273  * The functions directly modify the zone and global counters.
 274  */
 275 static inline void __mod_zone_page_state(struct zone *zone,
 276                         enum zone_stat_item item, int delta)
 277 {
 278         zone_page_state_add(delta, zone, item);
 279 }
 280
 281 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 282 {
 283         atomic_long_inc(&zone->vm_stat[item]);
 284         atomic_long_inc(&vm_stat[item]);
 285 }
 286
 287 static inline void __inc_zone_page_state(struct page *page,
 288                         enum zone_stat_item item)
 289 {
 290         __inc_zone_state(page_zone(page), item);
 291 }
 292
 293 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 294 {
 295         atomic_long_dec(&zone->vm_stat[item]);
 296         atomic_long_dec(&vm_stat[item]);
 297 }
 298
 299 static inline void __dec_zone_page_state(struct page *page,
 300                         enum zone_stat_item item)
 301 {
 302         __dec_zone_state(page_zone(page), item);
 303 }
 304
 305 /*
 306  * We only use atomic operations to update counters. So there is no need to
 307  * disable interrupts.
 308  */
 309 #define inc_zone_page_state __inc_zone_page_state
 310 #define dec_zone_page_state __dec_zone_page_state
 311 #define mod_zone_page_state __mod_zone_page_state
 312
 313 #define set_pgdat_percpu_threshold(pgdat, callback) { }
 314
 315 static inline void refresh_cpu_vm_stats(int cpu) { }
 316 #endif
 317
 318 #endif /* _LINUX_VMSTAT_H */