1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_VMSTAT_H 3 #define _LINUX_VMSTAT_H 4 5 #include <linux/types.h> 6 #include <linux/percpu.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_numa_stat[NR_VM_NUMA_STAT_ITEMS]; 112 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS]; 113 114 #ifdef CONFIG_NUMA 115 static inline void zone_numa_state_add(long x, struct zone *zone, 116 enum numa_stat_item item) 117 { 118 atomic_long_add(x, &zone->vm_numa_stat[item]); 119 atomic_long_add(x, &vm_numa_stat[item]); 120 } 121 122 static inline unsigned long global_numa_state(enum numa_stat_item item) 123 { 124 long x = atomic_long_read(&vm_numa_stat[item]); 125 126 return x; 127 } 128 129 static inline unsigned long zone_numa_state_snapshot(struct zone *zone, 130 enum numa_stat_item item) 131 { 132 long x = atomic_long_read(&zone->vm_numa_stat[item]); 133 int cpu; 134 135 for_each_online_cpu(cpu) 136 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item]; 137 138 return x; 139 } 140 #endif /* CONFIG_NUMA */ 141 142 static inline void zone_page_state_add(long x, struct zone *zone, 143 enum zone_stat_item item) 144 { 145 atomic_long_add(x, &zone->vm_stat[item]); 146 atomic_long_add(x, &vm_zone_stat[item]); 147 } 148 149 static inline void node_page_state_add(long x, struct pglist_data *pgdat, 150 enum node_stat_item item) 151 { 152 atomic_long_add(x, &pgdat->vm_stat[item]); 153 atomic_long_add(x, &vm_node_stat[item]); 154 } 155 156 static inline unsigned long global_zone_page_state(enum zone_stat_item item) 157 { 158 long x = atomic_long_read(&vm_zone_stat[item]); 159 #ifdef CONFIG_SMP 160 if (x < 0) 161 x = 0; 162 #endif 163 return x; 164 } 165 166 static inline unsigned long global_node_page_state(enum node_stat_item item) 167 { 168 long x = atomic_long_read(&vm_node_stat[item]); 169 #ifdef CONFIG_SMP 170 if (x < 0) 171 x = 0; 172 #endif 173 return x; 174 } 175 176 static inline unsigned long zone_page_state(struct zone *zone, 177 enum zone_stat_item item) 178 { 179 long x = atomic_long_read(&zone->vm_stat[item]); 180 #ifdef CONFIG_SMP 181 if (x < 0) 182 x = 0; 183 #endif 184 return x; 185 } 186 187 /* 188 * More accurate version that also considers the currently pending 189 * deltas. For that we need to loop over all cpus to find the current 190 * deltas. There is no synchronization so the result cannot be 191 * exactly accurate either. 192 */ 193 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 194 enum zone_stat_item item) 195 { 196 long x = atomic_long_read(&zone->vm_stat[item]); 197 198 #ifdef CONFIG_SMP 199 int cpu; 200 for_each_online_cpu(cpu) 201 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 202 203 if (x < 0) 204 x = 0; 205 #endif 206 return x; 207 } 208 209 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat, 210 enum node_stat_item item) 211 { 212 long x = atomic_long_read(&pgdat->vm_stat[item]); 213 214 #ifdef CONFIG_SMP 215 int cpu; 216 for_each_online_cpu(cpu) 217 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item]; 218 219 if (x < 0) 220 x = 0; 221 #endif 222 return x; 223 } 224 225 226 #ifdef CONFIG_NUMA 227 extern void __inc_numa_state(struct zone *zone, enum numa_stat_item item); 228 extern unsigned long sum_zone_node_page_state(int node, 229 enum zone_stat_item item); 230 extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item); 231 extern unsigned long node_page_state(struct pglist_data *pgdat, 232 enum node_stat_item item); 233 #else 234 #define sum_zone_node_page_state(node, item) global_zone_page_state(item) 235 #define node_page_state(node, item) global_node_page_state(item) 236 #endif /* CONFIG_NUMA */ 237 238 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 239 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 240 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d) 241 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d)) 242 243 #ifdef CONFIG_SMP 244 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long); 245 void __inc_zone_page_state(struct page *, enum zone_stat_item); 246 void __dec_zone_page_state(struct page *, enum zone_stat_item); 247 248 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long); 249 void __inc_node_page_state(struct page *, enum node_stat_item); 250 void __dec_node_page_state(struct page *, enum node_stat_item); 251 252 void mod_zone_page_state(struct zone *, enum zone_stat_item, long); 253 void inc_zone_page_state(struct page *, enum zone_stat_item); 254 void dec_zone_page_state(struct page *, enum zone_stat_item); 255 256 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long); 257 void inc_node_page_state(struct page *, enum node_stat_item); 258 void dec_node_page_state(struct page *, enum node_stat_item); 259 260 extern void inc_node_state(struct pglist_data *, enum node_stat_item); 261 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 262 extern void __inc_node_state(struct pglist_data *, enum node_stat_item); 263 extern void dec_zone_state(struct zone *, enum zone_stat_item); 264 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 265 extern void __dec_node_state(struct pglist_data *, enum node_stat_item); 266 267 void quiet_vmstat(void); 268 void cpu_vm_stats_fold(int cpu); 269 void refresh_zone_stat_thresholds(void); 270 271 struct ctl_table; 272 int vmstat_refresh(struct ctl_table *, int write, 273 void __user *buffer, size_t *lenp, loff_t *ppos); 274 275 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); 276 277 int calculate_pressure_threshold(struct zone *zone); 278 int calculate_normal_threshold(struct zone *zone); 279 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 280 int (*calculate_pressure)(struct zone *)); 281 #else /* CONFIG_SMP */ 282 283 /* 284 * We do not maintain differentials in a single processor configuration. 285 * The functions directly modify the zone and global counters. 286 */ 287 static inline void __mod_zone_page_state(struct zone *zone, 288 enum zone_stat_item item, long delta) 289 { 290 zone_page_state_add(delta, zone, item); 291 } 292 293 static inline void __mod_node_page_state(struct pglist_data *pgdat, 294 enum node_stat_item item, int delta) 295 { 296 node_page_state_add(delta, pgdat, item); 297 } 298 299 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 300 { 301 atomic_long_inc(&zone->vm_stat[item]); 302 atomic_long_inc(&vm_zone_stat[item]); 303 } 304 305 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item) 306 { 307 atomic_long_inc(&pgdat->vm_stat[item]); 308 atomic_long_inc(&vm_node_stat[item]); 309 } 310 311 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 312 { 313 atomic_long_dec(&zone->vm_stat[item]); 314 atomic_long_dec(&vm_zone_stat[item]); 315 } 316 317 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item) 318 { 319 atomic_long_dec(&pgdat->vm_stat[item]); 320 atomic_long_dec(&vm_node_stat[item]); 321 } 322 323 static inline void __inc_zone_page_state(struct page *page, 324 enum zone_stat_item item) 325 { 326 __inc_zone_state(page_zone(page), item); 327 } 328 329 static inline void __inc_node_page_state(struct page *page, 330 enum node_stat_item item) 331 { 332 __inc_node_state(page_pgdat(page), item); 333 } 334 335 336 static inline void __dec_zone_page_state(struct page *page, 337 enum zone_stat_item item) 338 { 339 __dec_zone_state(page_zone(page), item); 340 } 341 342 static inline void __dec_node_page_state(struct page *page, 343 enum node_stat_item item) 344 { 345 __dec_node_state(page_pgdat(page), item); 346 } 347 348 349 /* 350 * We only use atomic operations to update counters. So there is no need to 351 * disable interrupts. 352 */ 353 #define inc_zone_page_state __inc_zone_page_state 354 #define dec_zone_page_state __dec_zone_page_state 355 #define mod_zone_page_state __mod_zone_page_state 356 357 #define inc_node_page_state __inc_node_page_state 358 #define dec_node_page_state __dec_node_page_state 359 #define mod_node_page_state __mod_node_page_state 360 361 #define inc_zone_state __inc_zone_state 362 #define inc_node_state __inc_node_state 363 #define dec_zone_state __dec_zone_state 364 365 #define set_pgdat_percpu_threshold(pgdat, callback) { } 366 367 static inline void refresh_zone_stat_thresholds(void) { } 368 static inline void cpu_vm_stats_fold(int cpu) { } 369 static inline void quiet_vmstat(void) { } 370 371 static inline void drain_zonestat(struct zone *zone, 372 struct per_cpu_pageset *pset) { } 373 #endif /* CONFIG_SMP */ 374 375 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, 376 int migratetype) 377 { 378 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); 379 if (is_migrate_cma(migratetype)) 380 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); 381 } 382 383 extern const char * const vmstat_text[]; 384 385 #endif /* _LINUX_VMSTAT_H */ 386