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 const struct seq_operations fragmentation_op;
  58 extern const struct seq_operations pagetypeinfo_op;
  59 extern const struct seq_operations zoneinfo_op;
  60 extern const struct seq_operations vmstat_op;
  61 extern int sysctl_stat_interval;
  62
  63 #ifdef CONFIG_VM_EVENT_COUNTERS
  64 /*
  65  * Light weight per cpu counter implementation.
  66  *
  67  * Counters should only be incremented and no critical kernel component
  68  * should rely on the counter values.
  69  *
  70  * Counters are handled completely inline. On many platforms the code
  71  * generated will simply be the increment of a global address.
  72  */
  73
  74 struct vm_event_state {
  75         unsigned long event[NR_VM_EVENT_ITEMS];
  76 };
  77
  78 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  79
  80 static inline void __count_vm_event(enum vm_event_item item)
  81 {
  82         __get_cpu_var(vm_event_states).event[item]++;
  83 }
  84
  85 static inline void count_vm_event(enum vm_event_item item)
  86 {
  87         get_cpu_var(vm_event_states).event[item]++;
  88         put_cpu();
  89 }
  90
  91 static inline void __count_vm_events(enum vm_event_item item, long delta)
  92 {
  93         __get_cpu_var(vm_event_states).event[item] += delta;
  94 }
  95
  96 static inline void count_vm_events(enum vm_event_item item, long delta)
  97 {
  98         get_cpu_var(vm_event_states).event[item] += delta;
  99         put_cpu();
 100 }
 101
 102 extern void all_vm_events(unsigned long *);
 103 #ifdef CONFIG_HOTPLUG
 104 extern void vm_events_fold_cpu(int cpu);
 105 #else
 106 static inline void vm_events_fold_cpu(int cpu)
 107 {
 108 }
 109 #endif
 110
 111 #else
 112
 113 /* Disable counters */
 114 static inline void count_vm_event(enum vm_event_item item)
 115 {
 116 }
 117 static inline void count_vm_events(enum vm_event_item item, long delta)
 118 {
 119 }
 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 all_vm_events(unsigned long *ret)
 127 {
 128 }
 129 static inline void vm_events_fold_cpu(int cpu)
 130 {
 131 }
 132
 133 #endif /* CONFIG_VM_EVENT_COUNTERS */
 134
 135 #define __count_zone_vm_events(item, zone, delta) \
 136                 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
 137                 zone_idx(zone), delta)
 138
 139 /*
 140  * Zone based page accounting with per cpu differentials.
 141  */
 142 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 143
 144 static inline void zone_page_state_add(long x, struct zone *zone,
 145                                  enum zone_stat_item item)
 146 {
 147         atomic_long_add(x, &zone->vm_stat[item]);
 148         atomic_long_add(x, &vm_stat[item]);
 149 }
 150
 151 static inline unsigned long global_page_state(enum zone_stat_item item)
 152 {
 153         long x = atomic_long_read(&vm_stat[item]);
 154 #ifdef CONFIG_SMP
 155         if (x < 0)
 156                 x = 0;
 157 #endif
 158         return x;
 159 }
 160
 161 static inline unsigned long zone_page_state(struct zone *zone,
 162                                         enum zone_stat_item item)
 163 {
 164         long x = atomic_long_read(&zone->vm_stat[item]);
 165 #ifdef CONFIG_SMP
 166         if (x < 0)
 167                 x = 0;
 168 #endif
 169         return x;
 170 }
 171
 172 extern unsigned long global_lru_pages(void);
 173
 174 static inline unsigned long zone_lru_pages(struct zone *zone)
 175 {
 176         return (zone_page_state(zone, NR_ACTIVE_ANON)
 177                 + zone_page_state(zone, NR_ACTIVE_FILE)
 178                 + zone_page_state(zone, NR_INACTIVE_ANON)
 179                 + zone_page_state(zone, NR_INACTIVE_FILE));
 180 }
 181
 182 #ifdef CONFIG_NUMA
 183 /*
 184  * Determine the per node value of a stat item. This function
 185  * is called frequently in a NUMA machine, so try to be as
 186  * frugal as possible.
 187  */
 188 static inline unsigned long node_page_state(int node,
 189                                  enum zone_stat_item item)
 190 {
 191         struct zone *zones = NODE_DATA(node)->node_zones;
 192
 193         return
 194 #ifdef CONFIG_ZONE_DMA
 195                 zone_page_state(&zones[ZONE_DMA], item) +
 196 #endif
 197 #ifdef CONFIG_ZONE_DMA32
 198                 zone_page_state(&zones[ZONE_DMA32], item) +
 199 #endif
 200 #ifdef CONFIG_HIGHMEM
 201                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 202 #endif
 203                 zone_page_state(&zones[ZONE_NORMAL], item) +
 204                 zone_page_state(&zones[ZONE_MOVABLE], item);
 205 }
 206
 207 extern void zone_statistics(struct zone *, struct zone *);
 208
 209 #else
 210
 211 #define node_page_state(node, item) global_page_state(item)
 212 #define zone_statistics(_zl,_z) do { } while (0)
 213
 214 #endif /* CONFIG_NUMA */
 215
 216 #define __add_zone_page_state(__z, __i, __d)    \
 217                 __mod_zone_page_state(__z, __i, __d)
 218 #define __sub_zone_page_state(__z, __i, __d)    \
 219                 __mod_zone_page_state(__z, __i,-(__d))
 220
 221 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 222 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 223
 224 static inline void zap_zone_vm_stats(struct zone *zone)
 225 {
 226         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 227 }
 228
 229 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 230
 231 #ifdef CONFIG_SMP
 232 void __mod_zone_page_state(struct zone *, enum zone_stat_item 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 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 237 void inc_zone_page_state(struct page *, enum zone_stat_item);
 238 void dec_zone_page_state(struct page *, enum zone_stat_item);
 239
 240 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 241 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 242 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 243 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 244
 245 void refresh_cpu_vm_stats(int);
 246 #else /* CONFIG_SMP */
 247
 248 /*
 249  * We do not maintain differentials in a single processor configuration.
 250  * The functions directly modify the zone and global counters.
 251  */
 252 static inline void __mod_zone_page_state(struct zone *zone,
 253                         enum zone_stat_item item, int delta)
 254 {
 255         zone_page_state_add(delta, zone, item);
 256 }
 257
 258 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 259 {
 260         atomic_long_inc(&zone->vm_stat[item]);
 261         atomic_long_inc(&vm_stat[item]);
 262 }
 263
 264 static inline void __inc_zone_page_state(struct page *page,
 265                         enum zone_stat_item item)
 266 {
 267         __inc_zone_state(page_zone(page), item);
 268 }
 269
 270 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 271 {
 272         atomic_long_dec(&zone->vm_stat[item]);
 273         atomic_long_dec(&vm_stat[item]);
 274 }
 275
 276 static inline void __dec_zone_page_state(struct page *page,
 277                         enum zone_stat_item item)
 278 {
 279         __dec_zone_state(page_zone(page), item);
 280 }
 281
 282 /*
 283  * We only use atomic operations to update counters. So there is no need to
 284  * disable interrupts.
 285  */
 286 #define inc_zone_page_state __inc_zone_page_state
 287 #define dec_zone_page_state __dec_zone_page_state
 288 #define mod_zone_page_state __mod_zone_page_state
 289
 290 static inline void refresh_cpu_vm_stats(int cpu) { }
 291 #endif
 292
 293 #endif /* _LINUX_VMSTAT_H */