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 <linux/vm_event_item.h>
   9 #include <linux/atomic.h>
  10
  11 extern int sysctl_stat_interval;
  12
  13 #ifdef CONFIG_VM_EVENT_COUNTERS
  14 /*
  15  * Light weight per cpu counter implementation.
  16  *
  17  * Counters should only be incremented and no critical kernel component
  18  * should rely on the counter values.
  19  *
  20  * Counters are handled completely inline. On many platforms the code
  21  * generated will simply be the increment of a global address.
  22  */
  23
  24 struct vm_event_state {
  25         unsigned long event[NR_VM_EVENT_ITEMS];
  26 };
  27
  28 DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  29
  30 /*
  31  * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
  32  * local_irq_disable overhead.
  33  */
  34 static inline void __count_vm_event(enum vm_event_item item)
  35 {
  36         raw_cpu_inc(vm_event_states.event[item]);
  37 }
  38
  39 static inline void count_vm_event(enum vm_event_item item)
  40 {
  41         this_cpu_inc(vm_event_states.event[item]);
  42 }
  43
  44 static inline void __count_vm_events(enum vm_event_item item, long delta)
  45 {
  46         raw_cpu_add(vm_event_states.event[item], delta);
  47 }
  48
  49 static inline void count_vm_events(enum vm_event_item item, long delta)
  50 {
  51         this_cpu_add(vm_event_states.event[item], delta);
  52 }
  53
  54 extern void all_vm_events(unsigned long *);
  55
  56 extern void vm_events_fold_cpu(int cpu);
  57
  58 #else
  59
  60 /* Disable counters */
  61 static inline void count_vm_event(enum vm_event_item item)
  62 {
  63 }
  64 static inline void count_vm_events(enum vm_event_item item, long delta)
  65 {
  66 }
  67 static inline void __count_vm_event(enum vm_event_item item)
  68 {
  69 }
  70 static inline void __count_vm_events(enum vm_event_item item, long delta)
  71 {
  72 }
  73 static inline void all_vm_events(unsigned long *ret)
  74 {
  75 }
  76 static inline void vm_events_fold_cpu(int cpu)
  77 {
  78 }
  79
  80 #endif /* CONFIG_VM_EVENT_COUNTERS */
  81
  82 #ifdef CONFIG_NUMA_BALANCING
  83 #define count_vm_numa_event(x)     count_vm_event(x)
  84 #define count_vm_numa_events(x, y) count_vm_events(x, y)
  85 #else
  86 #define count_vm_numa_event(x) do {} while (0)
  87 #define count_vm_numa_events(x, y) do { (void)(y); } while (0)
  88 #endif /* CONFIG_NUMA_BALANCING */
  89
  90 #ifdef CONFIG_DEBUG_TLBFLUSH
  91 #define count_vm_tlb_event(x)      count_vm_event(x)
  92 #define count_vm_tlb_events(x, y)  count_vm_events(x, y)
  93 #else
  94 #define count_vm_tlb_event(x)     do {} while (0)
  95 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
  96 #endif
  97
  98 #ifdef CONFIG_DEBUG_VM_VMACACHE
  99 #define count_vm_vmacache_event(x) count_vm_event(x)
 100 #else
 101 #define count_vm_vmacache_event(x) do {} while (0)
 102 #endif
 103
 104 #define __count_zid_vm_events(item, zid, delta) \
 105         __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
 106
 107 /*
 108  * Zone and node-based page accounting with per cpu differentials.
 109  */
 110 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
 111 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
 112
 113 static inline void zone_page_state_add(long x, struct zone *zone,
 114                                  enum zone_stat_item item)
 115 {
 116         atomic_long_add(x, &zone->vm_stat[item]);
 117         atomic_long_add(x, &vm_zone_stat[item]);
 118 }
 119
 120 static inline void node_page_state_add(long x, struct pglist_data *pgdat,
 121                                  enum node_stat_item item)
 122 {
 123         atomic_long_add(x, &pgdat->vm_stat[item]);
 124         atomic_long_add(x, &vm_node_stat[item]);
 125 }
 126
 127 static inline unsigned long global_page_state(enum zone_stat_item item)
 128 {
 129         long x = atomic_long_read(&vm_zone_stat[item]);
 130 #ifdef CONFIG_SMP
 131         if (x < 0)
 132                 x = 0;
 133 #endif
 134         return x;
 135 }
 136
 137 static inline unsigned long global_node_page_state(enum node_stat_item item)
 138 {
 139         long x = atomic_long_read(&vm_node_stat[item]);
 140 #ifdef CONFIG_SMP
 141         if (x < 0)
 142                 x = 0;
 143 #endif
 144         return x;
 145 }
 146
 147 static inline unsigned long zone_page_state(struct zone *zone,
 148                                         enum zone_stat_item item)
 149 {
 150         long x = atomic_long_read(&zone->vm_stat[item]);
 151 #ifdef CONFIG_SMP
 152         if (x < 0)
 153                 x = 0;
 154 #endif
 155         return x;
 156 }
 157
 158 /*
 159  * More accurate version that also considers the currently pending
 160  * deltas. For that we need to loop over all cpus to find the current
 161  * deltas. There is no synchronization so the result cannot be
 162  * exactly accurate either.
 163  */
 164 static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 165                                         enum zone_stat_item item)
 166 {
 167         long x = atomic_long_read(&zone->vm_stat[item]);
 168
 169 #ifdef CONFIG_SMP
 170         int cpu;
 171         for_each_online_cpu(cpu)
 172                 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
 173
 174         if (x < 0)
 175                 x = 0;
 176 #endif
 177         return x;
 178 }
 179
 180 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat,
 181                                         enum node_stat_item item)
 182 {
 183         long x = atomic_long_read(&pgdat->vm_stat[item]);
 184
 185 #ifdef CONFIG_SMP
 186         int cpu;
 187         for_each_online_cpu(cpu)
 188                 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item];
 189
 190         if (x < 0)
 191                 x = 0;
 192 #endif
 193         return x;
 194 }
 195
 196
 197 #ifdef CONFIG_NUMA
 198 extern unsigned long sum_zone_node_page_state(int node,
 199                                                 enum zone_stat_item item);
 200 extern unsigned long node_page_state(struct pglist_data *pgdat,
 201                                                 enum node_stat_item item);
 202 #else
 203 #define sum_zone_node_page_state(node, item) global_page_state(item)
 204 #define node_page_state(node, item) global_node_page_state(item)
 205 #endif /* CONFIG_NUMA */
 206
 207 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 208 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
 209 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d)
 210 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d))
 211
 212 #ifdef CONFIG_SMP
 213 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
 214 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 215 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 216
 217 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
 218 void __inc_node_page_state(struct page *, enum node_stat_item);
 219 void __dec_node_page_state(struct page *, enum node_stat_item);
 220
 221 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
 222 void inc_zone_page_state(struct page *, enum zone_stat_item);
 223 void dec_zone_page_state(struct page *, enum zone_stat_item);
 224
 225 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
 226 void inc_node_page_state(struct page *, enum node_stat_item);
 227 void dec_node_page_state(struct page *, enum node_stat_item);
 228
 229 extern void inc_node_state(struct pglist_data *, enum node_stat_item);
 230 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 231 extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
 232 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 233 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 234 extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
 235
 236 void quiet_vmstat(void);
 237 void cpu_vm_stats_fold(int cpu);
 238 void refresh_zone_stat_thresholds(void);
 239
 240 struct ctl_table;
 241 int vmstat_refresh(struct ctl_table *, int write,
 242                    void __user *buffer, size_t *lenp, loff_t *ppos);
 243
 244 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
 245
 246 int calculate_pressure_threshold(struct zone *zone);
 247 int calculate_normal_threshold(struct zone *zone);
 248 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
 249                                 int (*calculate_pressure)(struct zone *));
 250 #else /* CONFIG_SMP */
 251
 252 /*
 253  * We do not maintain differentials in a single processor configuration.
 254  * The functions directly modify the zone and global counters.
 255  */
 256 static inline void __mod_zone_page_state(struct zone *zone,
 257                         enum zone_stat_item item, long delta)
 258 {
 259         zone_page_state_add(delta, zone, item);
 260 }
 261
 262 static inline void __mod_node_page_state(struct pglist_data *pgdat,
 263                         enum node_stat_item item, int delta)
 264 {
 265         node_page_state_add(delta, pgdat, item);
 266 }
 267
 268 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 269 {
 270         atomic_long_inc(&zone->vm_stat[item]);
 271         atomic_long_inc(&vm_zone_stat[item]);
 272 }
 273
 274 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
 275 {
 276         atomic_long_inc(&pgdat->vm_stat[item]);
 277         atomic_long_inc(&vm_node_stat[item]);
 278 }
 279
 280 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 281 {
 282         atomic_long_dec(&zone->vm_stat[item]);
 283         atomic_long_dec(&vm_zone_stat[item]);
 284 }
 285
 286 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
 287 {
 288         atomic_long_dec(&pgdat->vm_stat[item]);
 289         atomic_long_dec(&vm_node_stat[item]);
 290 }
 291
 292 static inline void __inc_zone_page_state(struct page *page,
 293                         enum zone_stat_item item)
 294 {
 295         __inc_zone_state(page_zone(page), item);
 296 }
 297
 298 static inline void __inc_node_page_state(struct page *page,
 299                         enum node_stat_item item)
 300 {
 301         __inc_node_state(page_pgdat(page), item);
 302 }
 303
 304
 305 static inline void __dec_zone_page_state(struct page *page,
 306                         enum zone_stat_item item)
 307 {
 308         __dec_zone_state(page_zone(page), item);
 309 }
 310
 311 static inline void __dec_node_page_state(struct page *page,
 312                         enum node_stat_item item)
 313 {
 314         __dec_node_state(page_pgdat(page), item);
 315 }
 316
 317
 318 /*
 319  * We only use atomic operations to update counters. So there is no need to
 320  * disable interrupts.
 321  */
 322 #define inc_zone_page_state __inc_zone_page_state
 323 #define dec_zone_page_state __dec_zone_page_state
 324 #define mod_zone_page_state __mod_zone_page_state
 325
 326 #define inc_node_page_state __inc_node_page_state
 327 #define dec_node_page_state __dec_node_page_state
 328 #define mod_node_page_state __mod_node_page_state
 329
 330 #define inc_zone_state __inc_zone_state
 331 #define inc_node_state __inc_node_state
 332 #define dec_zone_state __dec_zone_state
 333
 334 #define set_pgdat_percpu_threshold(pgdat, callback) { }
 335
 336 static inline void refresh_zone_stat_thresholds(void) { }
 337 static inline void cpu_vm_stats_fold(int cpu) { }
 338 static inline void quiet_vmstat(void) { }
 339
 340 static inline void drain_zonestat(struct zone *zone,
 341                         struct per_cpu_pageset *pset) { }
 342 #endif          /* CONFIG_SMP */
 343
 344 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
 345                                              int migratetype)
 346 {
 347         __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
 348         if (is_migrate_cma(migratetype))
 349                 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
 350 }
 351
 352 extern const char * const vmstat_text[];
 353
 354 #endif /* _LINUX_VMSTAT_H */