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_numa_stat[NR_VM_NUMA_STAT_ITEMS]; 111 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS]; 112 113 #ifdef CONFIG_NUMA 114 static inline void zone_numa_state_add(long x, struct zone *zone, 115 enum numa_stat_item item) 116 { 117 atomic_long_add(x, &zone->vm_numa_stat[item]); 118 atomic_long_add(x, &vm_numa_stat[item]); 119 } 120 121 static inline unsigned long global_numa_state(enum numa_stat_item item) 122 { 123 long x = atomic_long_read(&vm_numa_stat[item]); 124 125 return x; 126 } 127 128 static inline unsigned long zone_numa_state_snapshot(struct zone *zone, 129 enum numa_stat_item item) 130 { 131 long x = atomic_long_read(&zone->vm_numa_stat[item]); 132 int cpu; 133 134 for_each_online_cpu(cpu) 135 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item]; 136 137 return x; 138 } 139 #endif /* CONFIG_NUMA */ 140 141 static inline void zone_page_state_add(long x, struct zone *zone, 142 enum zone_stat_item item) 143 { 144 atomic_long_add(x, &zone->vm_stat[item]); 145 atomic_long_add(x, &vm_zone_stat[item]); 146 } 147 148 static inline void node_page_state_add(long x, struct pglist_data *pgdat, 149 enum node_stat_item item) 150 { 151 atomic_long_add(x, &pgdat->vm_stat[item]); 152 atomic_long_add(x, &vm_node_stat[item]); 153 } 154 155 static inline unsigned long global_zone_page_state(enum zone_stat_item item) 156 { 157 long x = atomic_long_read(&vm_zone_stat[item]); 158 #ifdef CONFIG_SMP 159 if (x < 0) 160 x = 0; 161 #endif 162 return x; 163 } 164 165 static inline unsigned long global_node_page_state(enum node_stat_item item) 166 { 167 long x = atomic_long_read(&vm_node_stat[item]); 168 #ifdef CONFIG_SMP 169 if (x < 0) 170 x = 0; 171 #endif 172 return x; 173 } 174 175 static inline unsigned long zone_page_state(struct zone *zone, 176 enum zone_stat_item item) 177 { 178 long x = atomic_long_read(&zone->vm_stat[item]); 179 #ifdef CONFIG_SMP 180 if (x < 0) 181 x = 0; 182 #endif 183 return x; 184 } 185 186 /* 187 * More accurate version that also considers the currently pending 188 * deltas. For that we need to loop over all cpus to find the current 189 * deltas. There is no synchronization so the result cannot be 190 * exactly accurate either. 191 */ 192 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 193 enum zone_stat_item item) 194 { 195 long x = atomic_long_read(&zone->vm_stat[item]); 196 197 #ifdef CONFIG_SMP 198 int cpu; 199 for_each_online_cpu(cpu) 200 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 201 202 if (x < 0) 203 x = 0; 204 #endif 205 return x; 206 } 207 208 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat, 209 enum node_stat_item item) 210 { 211 long x = atomic_long_read(&pgdat->vm_stat[item]); 212 213 #ifdef CONFIG_SMP 214 int cpu; 215 for_each_online_cpu(cpu) 216 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item]; 217 218 if (x < 0) 219 x = 0; 220 #endif 221 return x; 222 } 223 224 225 #ifdef CONFIG_NUMA 226 extern void __inc_numa_state(struct zone *zone, enum numa_stat_item item); 227 extern unsigned long sum_zone_node_page_state(int node, 228 enum zone_stat_item item); 229 extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item); 230 extern unsigned long node_page_state(struct pglist_data *pgdat, 231 enum node_stat_item item); 232 #else 233 #define sum_zone_node_page_state(node, item) global_zone_page_state(item) 234 #define node_page_state(node, item) global_node_page_state(item) 235 #endif /* CONFIG_NUMA */ 236 237 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 238 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 239 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d) 240 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d)) 241 242 #ifdef CONFIG_SMP 243 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long); 244 void __inc_zone_page_state(struct page *, enum zone_stat_item); 245 void __dec_zone_page_state(struct page *, enum zone_stat_item); 246 247 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long); 248 void __inc_node_page_state(struct page *, enum node_stat_item); 249 void __dec_node_page_state(struct page *, enum node_stat_item); 250 251 void mod_zone_page_state(struct zone *, enum zone_stat_item, long); 252 void inc_zone_page_state(struct page *, enum zone_stat_item); 253 void dec_zone_page_state(struct page *, enum zone_stat_item); 254 255 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long); 256 void inc_node_page_state(struct page *, enum node_stat_item); 257 void dec_node_page_state(struct page *, enum node_stat_item); 258 259 extern void inc_node_state(struct pglist_data *, enum node_stat_item); 260 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 261 extern void __inc_node_state(struct pglist_data *, enum node_stat_item); 262 extern void dec_zone_state(struct zone *, enum zone_stat_item); 263 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 264 extern void __dec_node_state(struct pglist_data *, enum node_stat_item); 265 266 void quiet_vmstat(void); 267 void cpu_vm_stats_fold(int cpu); 268 void refresh_zone_stat_thresholds(void); 269 270 struct ctl_table; 271 int vmstat_refresh(struct ctl_table *, int write, 272 void __user *buffer, size_t *lenp, loff_t *ppos); 273 274 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); 275 276 int calculate_pressure_threshold(struct zone *zone); 277 int calculate_normal_threshold(struct zone *zone); 278 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 279 int (*calculate_pressure)(struct zone *)); 280 #else /* CONFIG_SMP */ 281 282 /* 283 * We do not maintain differentials in a single processor configuration. 284 * The functions directly modify the zone and global counters. 285 */ 286 static inline void __mod_zone_page_state(struct zone *zone, 287 enum zone_stat_item item, long delta) 288 { 289 zone_page_state_add(delta, zone, item); 290 } 291 292 static inline void __mod_node_page_state(struct pglist_data *pgdat, 293 enum node_stat_item item, int delta) 294 { 295 node_page_state_add(delta, pgdat, item); 296 } 297 298 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 299 { 300 atomic_long_inc(&zone->vm_stat[item]); 301 atomic_long_inc(&vm_zone_stat[item]); 302 } 303 304 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item) 305 { 306 atomic_long_inc(&pgdat->vm_stat[item]); 307 atomic_long_inc(&vm_node_stat[item]); 308 } 309 310 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 311 { 312 atomic_long_dec(&zone->vm_stat[item]); 313 atomic_long_dec(&vm_zone_stat[item]); 314 } 315 316 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item) 317 { 318 atomic_long_dec(&pgdat->vm_stat[item]); 319 atomic_long_dec(&vm_node_stat[item]); 320 } 321 322 static inline void __inc_zone_page_state(struct page *page, 323 enum zone_stat_item item) 324 { 325 __inc_zone_state(page_zone(page), item); 326 } 327 328 static inline void __inc_node_page_state(struct page *page, 329 enum node_stat_item item) 330 { 331 __inc_node_state(page_pgdat(page), item); 332 } 333 334 335 static inline void __dec_zone_page_state(struct page *page, 336 enum zone_stat_item item) 337 { 338 __dec_zone_state(page_zone(page), item); 339 } 340 341 static inline void __dec_node_page_state(struct page *page, 342 enum node_stat_item item) 343 { 344 __dec_node_state(page_pgdat(page), item); 345 } 346 347 348 /* 349 * We only use atomic operations to update counters. So there is no need to 350 * disable interrupts. 351 */ 352 #define inc_zone_page_state __inc_zone_page_state 353 #define dec_zone_page_state __dec_zone_page_state 354 #define mod_zone_page_state __mod_zone_page_state 355 356 #define inc_node_page_state __inc_node_page_state 357 #define dec_node_page_state __dec_node_page_state 358 #define mod_node_page_state __mod_node_page_state 359 360 #define inc_zone_state __inc_zone_state 361 #define inc_node_state __inc_node_state 362 #define dec_zone_state __dec_zone_state 363 364 #define set_pgdat_percpu_threshold(pgdat, callback) { } 365 366 static inline void refresh_zone_stat_thresholds(void) { } 367 static inline void cpu_vm_stats_fold(int cpu) { } 368 static inline void quiet_vmstat(void) { } 369 370 static inline void drain_zonestat(struct zone *zone, 371 struct per_cpu_pageset *pset) { } 372 #endif /* CONFIG_SMP */ 373 374 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, 375 int migratetype) 376 { 377 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); 378 if (is_migrate_cma(migratetype)) 379 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); 380 } 381 382 extern const char * const vmstat_text[]; 383 384 #endif /* _LINUX_VMSTAT_H */ 385