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