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