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