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/mmzone.h>
   7 #include <asm/atomic.h>
   8
   9 #ifdef CONFIG_VM_EVENT_COUNTERS
  10 /*
  11  * Light weight per cpu counter implementation.
  12  *
  13  * Counters should only be incremented.  You need to set EMBEDDED
  14  * to disable VM_EVENT_COUNTERS.  Things like procps (vmstat,
  15  * top, etc) use /proc/vmstat and depend on these counters.
  16  *
  17  * Counters are handled completely inline. On many platforms the code
  18  * generated will simply be the increment of a global address.
  19  */
  20
  21 #ifdef CONFIG_ZONE_DMA32
  22 #define DMA32_ZONE(xx) xx##_DMA32,
  23 #else
  24 #define DMA32_ZONE(xx)
  25 #endif
  26
  27 #ifdef CONFIG_HIGHMEM
  28 #define HIGHMEM_ZONE(xx) , xx##_HIGH
  29 #else
  30 #define HIGHMEM_ZONE(xx)
  31 #endif
  32
  33 #define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
  34
  35 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
  36                 FOR_ALL_ZONES(PGALLOC),
  37                 PGFREE, PGACTIVATE, PGDEACTIVATE,
  38                 PGFAULT, PGMAJFAULT,
  39                 FOR_ALL_ZONES(PGREFILL),
  40                 FOR_ALL_ZONES(PGSTEAL),
  41                 FOR_ALL_ZONES(PGSCAN_KSWAPD),
  42                 FOR_ALL_ZONES(PGSCAN_DIRECT),
  43                 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
  44                 PAGEOUTRUN, ALLOCSTALL, PGROTATED,
  45                 NR_VM_EVENT_ITEMS
  46 };
  47
  48 struct vm_event_state {
  49         unsigned long event[NR_VM_EVENT_ITEMS];
  50 };
  51
  52 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  53
  54 static inline void __count_vm_event(enum vm_event_item item)
  55 {
  56         __get_cpu_var(vm_event_states).event[item]++;
  57 }
  58
  59 static inline void count_vm_event(enum vm_event_item item)
  60 {
  61         get_cpu_var(vm_event_states).event[item]++;
  62         put_cpu();
  63 }
  64
  65 static inline void __count_vm_events(enum vm_event_item item, long delta)
  66 {
  67         __get_cpu_var(vm_event_states).event[item] += delta;
  68 }
  69
  70 static inline void count_vm_events(enum vm_event_item item, long delta)
  71 {
  72         get_cpu_var(vm_event_states).event[item] += delta;
  73         put_cpu();
  74 }
  75
  76 extern void all_vm_events(unsigned long *);
  77 #ifdef CONFIG_HOTPLUG
  78 extern void vm_events_fold_cpu(int cpu);
  79 #else
  80 static inline void vm_events_fold_cpu(int cpu)
  81 {
  82 }
  83 #endif
  84
  85 #else
  86
  87 /* Disable counters */
  88 #define get_cpu_vm_events(e)    0L
  89 #define count_vm_event(e)       do { } while (0)
  90 #define count_vm_events(e,d)    do { } while (0)
  91 #define __count_vm_event(e)     do { } while (0)
  92 #define __count_vm_events(e,d)  do { } while (0)
  93 #define vm_events_fold_cpu(x)   do { } while (0)
  94
  95 #endif /* CONFIG_VM_EVENT_COUNTERS */
  96
  97 #define __count_zone_vm_events(item, zone, delta) \
  98                         __count_vm_events(item##_DMA + zone_idx(zone), delta)
  99
 100 /*
 101  * Zone based page accounting with per cpu differentials.
 102  */
 103 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
 104
 105 static inline void zone_page_state_add(long x, struct zone *zone,
 106                                  enum zone_stat_item item)
 107 {
 108         atomic_long_add(x, &zone->vm_stat[item]);
 109         atomic_long_add(x, &vm_stat[item]);
 110 }
 111
 112 static inline unsigned long global_page_state(enum zone_stat_item item)
 113 {
 114         long x = atomic_long_read(&vm_stat[item]);
 115 #ifdef CONFIG_SMP
 116         if (x < 0)
 117                 x = 0;
 118 #endif
 119         return x;
 120 }
 121
 122 static inline unsigned long zone_page_state(struct zone *zone,
 123                                         enum zone_stat_item item)
 124 {
 125         long x = atomic_long_read(&zone->vm_stat[item]);
 126 #ifdef CONFIG_SMP
 127         if (x < 0)
 128                 x = 0;
 129 #endif
 130         return x;
 131 }
 132
 133 #ifdef CONFIG_NUMA
 134 /*
 135  * Determine the per node value of a stat item. This function
 136  * is called frequently in a NUMA machine, so try to be as
 137  * frugal as possible.
 138  */
 139 static inline unsigned long node_page_state(int node,
 140                                  enum zone_stat_item item)
 141 {
 142         struct zone *zones = NODE_DATA(node)->node_zones;
 143
 144         return
 145 #ifdef CONFIG_ZONE_DMA32
 146                 zone_page_state(&zones[ZONE_DMA32], item) +
 147 #endif
 148                 zone_page_state(&zones[ZONE_NORMAL], item) +
 149 #ifdef CONFIG_HIGHMEM
 150                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 151 #endif
 152                 zone_page_state(&zones[ZONE_DMA], item);
 153 }
 154
 155 extern void zone_statistics(struct zonelist *, struct zone *);
 156
 157 #else
 158
 159 #define node_page_state(node, item) global_page_state(item)
 160 #define zone_statistics(_zl,_z) do { } while (0)
 161
 162 #endif /* CONFIG_NUMA */
 163
 164 #define __add_zone_page_state(__z, __i, __d)    \
 165                 __mod_zone_page_state(__z, __i, __d)
 166 #define __sub_zone_page_state(__z, __i, __d)    \
 167                 __mod_zone_page_state(__z, __i,-(__d))
 168
 169 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 170 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 171
 172 static inline void zap_zone_vm_stats(struct zone *zone)
 173 {
 174         memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
 175 }
 176
 177 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 178
 179 #ifdef CONFIG_SMP
 180 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
 181 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 182 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 183
 184 void mod_zone_page_state(struct zone *, enum zone_stat_item, int);
 185 void inc_zone_page_state(struct page *, enum zone_stat_item);
 186 void dec_zone_page_state(struct page *, enum zone_stat_item);
 187
 188 extern void inc_zone_state(struct zone *, enum zone_stat_item);
 189
 190 void refresh_cpu_vm_stats(int);
 191 void refresh_vm_stats(void);
 192
 193 #else /* CONFIG_SMP */
 194
 195 /*
 196  * We do not maintain differentials in a single processor configuration.
 197  * The functions directly modify the zone and global counters.
 198  */
 199 static inline void __mod_zone_page_state(struct zone *zone,
 200                         enum zone_stat_item item, int delta)
 201 {
 202         zone_page_state_add(delta, zone, item);
 203 }
 204
 205 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 206 {
 207         atomic_long_inc(&zone->vm_stat[item]);
 208         atomic_long_inc(&vm_stat[item]);
 209 }
 210
 211 static inline void __inc_zone_page_state(struct page *page,
 212                         enum zone_stat_item item)
 213 {
 214         __inc_zone_state(page_zone(page), item);
 215 }
 216
 217 static inline void __dec_zone_page_state(struct page *page,
 218                         enum zone_stat_item item)
 219 {
 220         atomic_long_dec(&page_zone(page)->vm_stat[item]);
 221         atomic_long_dec(&vm_stat[item]);
 222 }
 223
 224 /*
 225  * We only use atomic operations to update counters. So there is no need to
 226  * disable interrupts.
 227  */
 228 #define inc_zone_page_state __inc_zone_page_state
 229 #define dec_zone_page_state __dec_zone_page_state
 230 #define mod_zone_page_state __mod_zone_page_state
 231
 232 static inline void refresh_cpu_vm_stats(int cpu) { }
 233 static inline void refresh_vm_stats(void) { }
 234 #endif
 235
 236 #endif /* _LINUX_VMSTAT_H */