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 #include <linux/static_key.h> 11 12 extern int sysctl_stat_interval; 13 14 #ifdef CONFIG_NUMA 15 #define ENABLE_NUMA_STAT 1 16 #define DISABLE_NUMA_STAT 0 17 extern int sysctl_vm_numa_stat; 18 DECLARE_STATIC_KEY_TRUE(vm_numa_stat_key); 19 extern int sysctl_vm_numa_stat_handler(struct ctl_table *table, 20 int write, void __user *buffer, size_t *length, loff_t *ppos); 21 #endif 22 23 #ifdef CONFIG_VM_EVENT_COUNTERS 24 /* 25 * Light weight per cpu counter implementation. 26 * 27 * Counters should only be incremented and no critical kernel component 28 * should rely on the counter values. 29 * 30 * Counters are handled completely inline. On many platforms the code 31 * generated will simply be the increment of a global address. 32 */ 33 34 struct vm_event_state { 35 unsigned long event[NR_VM_EVENT_ITEMS]; 36 }; 37 38 DECLARE_PER_CPU(struct vm_event_state, vm_event_states); 39 40 /* 41 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the 42 * local_irq_disable overhead. 43 */ 44 static inline void __count_vm_event(enum vm_event_item item) 45 { 46 raw_cpu_inc(vm_event_states.event[item]); 47 } 48 49 static inline void count_vm_event(enum vm_event_item item) 50 { 51 this_cpu_inc(vm_event_states.event[item]); 52 } 53 54 static inline void __count_vm_events(enum vm_event_item item, long delta) 55 { 56 raw_cpu_add(vm_event_states.event[item], delta); 57 } 58 59 static inline void count_vm_events(enum vm_event_item item, long delta) 60 { 61 this_cpu_add(vm_event_states.event[item], delta); 62 } 63 64 extern void all_vm_events(unsigned long *); 65 66 extern void vm_events_fold_cpu(int cpu); 67 68 #else 69 70 /* Disable counters */ 71 static inline void count_vm_event(enum vm_event_item item) 72 { 73 } 74 static inline void count_vm_events(enum vm_event_item item, long delta) 75 { 76 } 77 static inline void __count_vm_event(enum vm_event_item item) 78 { 79 } 80 static inline void __count_vm_events(enum vm_event_item item, long delta) 81 { 82 } 83 static inline void all_vm_events(unsigned long *ret) 84 { 85 } 86 static inline void vm_events_fold_cpu(int cpu) 87 { 88 } 89 90 #endif /* CONFIG_VM_EVENT_COUNTERS */ 91 92 #ifdef CONFIG_NUMA_BALANCING 93 #define count_vm_numa_event(x) count_vm_event(x) 94 #define count_vm_numa_events(x, y) count_vm_events(x, y) 95 #else 96 #define count_vm_numa_event(x) do {} while (0) 97 #define count_vm_numa_events(x, y) do { (void)(y); } while (0) 98 #endif /* CONFIG_NUMA_BALANCING */ 99 100 #ifdef CONFIG_DEBUG_TLBFLUSH 101 #define count_vm_tlb_event(x) count_vm_event(x) 102 #define count_vm_tlb_events(x, y) count_vm_events(x, y) 103 #else 104 #define count_vm_tlb_event(x) do {} while (0) 105 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0) 106 #endif 107 108 #ifdef CONFIG_DEBUG_VM_VMACACHE 109 #define count_vm_vmacache_event(x) count_vm_event(x) 110 #else 111 #define count_vm_vmacache_event(x) do {} while (0) 112 #endif 113 114 #define __count_zid_vm_events(item, zid, delta) \ 115 __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta) 116 117 /* 118 * Zone and node-based page accounting with per cpu differentials. 119 */ 120 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS]; 121 extern atomic_long_t vm_numa_stat[NR_VM_NUMA_STAT_ITEMS]; 122 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS]; 123 124 #ifdef CONFIG_NUMA 125 static inline void zone_numa_state_add(long x, struct zone *zone, 126 enum numa_stat_item item) 127 { 128 atomic_long_add(x, &zone->vm_numa_stat[item]); 129 atomic_long_add(x, &vm_numa_stat[item]); 130 } 131 132 static inline unsigned long global_numa_state(enum numa_stat_item item) 133 { 134 long x = atomic_long_read(&vm_numa_stat[item]); 135 136 return x; 137 } 138 139 static inline unsigned long zone_numa_state_snapshot(struct zone *zone, 140 enum numa_stat_item item) 141 { 142 long x = atomic_long_read(&zone->vm_numa_stat[item]); 143 int cpu; 144 145 for_each_online_cpu(cpu) 146 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item]; 147 148 return x; 149 } 150 #endif /* CONFIG_NUMA */ 151 152 static inline void zone_page_state_add(long x, struct zone *zone, 153 enum zone_stat_item item) 154 { 155 atomic_long_add(x, &zone->vm_stat[item]); 156 atomic_long_add(x, &vm_zone_stat[item]); 157 } 158 159 static inline void node_page_state_add(long x, struct pglist_data *pgdat, 160 enum node_stat_item item) 161 { 162 atomic_long_add(x, &pgdat->vm_stat[item]); 163 atomic_long_add(x, &vm_node_stat[item]); 164 } 165 166 static inline unsigned long global_zone_page_state(enum zone_stat_item item) 167 { 168 long x = atomic_long_read(&vm_zone_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 global_node_page_state(enum node_stat_item item) 177 { 178 long x = atomic_long_read(&vm_node_stat[item]); 179 #ifdef CONFIG_SMP 180 if (x < 0) 181 x = 0; 182 #endif 183 return x; 184 } 185 186 static inline unsigned long zone_page_state(struct zone *zone, 187 enum zone_stat_item item) 188 { 189 long x = atomic_long_read(&zone->vm_stat[item]); 190 #ifdef CONFIG_SMP 191 if (x < 0) 192 x = 0; 193 #endif 194 return x; 195 } 196 197 /* 198 * More accurate version that also considers the currently pending 199 * deltas. For that we need to loop over all cpus to find the current 200 * deltas. There is no synchronization so the result cannot be 201 * exactly accurate either. 202 */ 203 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 204 enum zone_stat_item item) 205 { 206 long x = atomic_long_read(&zone->vm_stat[item]); 207 208 #ifdef CONFIG_SMP 209 int cpu; 210 for_each_online_cpu(cpu) 211 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 212 213 if (x < 0) 214 x = 0; 215 #endif 216 return x; 217 } 218 219 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat, 220 enum node_stat_item item) 221 { 222 long x = atomic_long_read(&pgdat->vm_stat[item]); 223 224 #ifdef CONFIG_SMP 225 int cpu; 226 for_each_online_cpu(cpu) 227 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item]; 228 229 if (x < 0) 230 x = 0; 231 #endif 232 return x; 233 } 234 235 236 #ifdef CONFIG_NUMA 237 extern void __inc_numa_state(struct zone *zone, enum numa_stat_item item); 238 extern unsigned long sum_zone_node_page_state(int node, 239 enum zone_stat_item item); 240 extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item); 241 extern unsigned long node_page_state(struct pglist_data *pgdat, 242 enum node_stat_item item); 243 #else 244 #define sum_zone_node_page_state(node, item) global_zone_page_state(item) 245 #define node_page_state(node, item) global_node_page_state(item) 246 #endif /* CONFIG_NUMA */ 247 248 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 249 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 250 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d) 251 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d)) 252 253 #ifdef CONFIG_SMP 254 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long); 255 void __inc_zone_page_state(struct page *, enum zone_stat_item); 256 void __dec_zone_page_state(struct page *, enum zone_stat_item); 257 258 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long); 259 void __inc_node_page_state(struct page *, enum node_stat_item); 260 void __dec_node_page_state(struct page *, enum node_stat_item); 261 262 void mod_zone_page_state(struct zone *, enum zone_stat_item, long); 263 void inc_zone_page_state(struct page *, enum zone_stat_item); 264 void dec_zone_page_state(struct page *, enum zone_stat_item); 265 266 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long); 267 void inc_node_page_state(struct page *, enum node_stat_item); 268 void dec_node_page_state(struct page *, enum node_stat_item); 269 270 extern void inc_node_state(struct pglist_data *, enum node_stat_item); 271 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 272 extern void __inc_node_state(struct pglist_data *, enum node_stat_item); 273 extern void dec_zone_state(struct zone *, enum zone_stat_item); 274 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 275 extern void __dec_node_state(struct pglist_data *, enum node_stat_item); 276 277 void quiet_vmstat(void); 278 void cpu_vm_stats_fold(int cpu); 279 void refresh_zone_stat_thresholds(void); 280 281 struct ctl_table; 282 int vmstat_refresh(struct ctl_table *, int write, 283 void __user *buffer, size_t *lenp, loff_t *ppos); 284 285 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); 286 287 int calculate_pressure_threshold(struct zone *zone); 288 int calculate_normal_threshold(struct zone *zone); 289 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 290 int (*calculate_pressure)(struct zone *)); 291 #else /* CONFIG_SMP */ 292 293 /* 294 * We do not maintain differentials in a single processor configuration. 295 * The functions directly modify the zone and global counters. 296 */ 297 static inline void __mod_zone_page_state(struct zone *zone, 298 enum zone_stat_item item, long delta) 299 { 300 zone_page_state_add(delta, zone, item); 301 } 302 303 static inline void __mod_node_page_state(struct pglist_data *pgdat, 304 enum node_stat_item item, int delta) 305 { 306 node_page_state_add(delta, pgdat, item); 307 } 308 309 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 310 { 311 atomic_long_inc(&zone->vm_stat[item]); 312 atomic_long_inc(&vm_zone_stat[item]); 313 } 314 315 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item) 316 { 317 atomic_long_inc(&pgdat->vm_stat[item]); 318 atomic_long_inc(&vm_node_stat[item]); 319 } 320 321 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 322 { 323 atomic_long_dec(&zone->vm_stat[item]); 324 atomic_long_dec(&vm_zone_stat[item]); 325 } 326 327 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item) 328 { 329 atomic_long_dec(&pgdat->vm_stat[item]); 330 atomic_long_dec(&vm_node_stat[item]); 331 } 332 333 static inline void __inc_zone_page_state(struct page *page, 334 enum zone_stat_item item) 335 { 336 __inc_zone_state(page_zone(page), item); 337 } 338 339 static inline void __inc_node_page_state(struct page *page, 340 enum node_stat_item item) 341 { 342 __inc_node_state(page_pgdat(page), item); 343 } 344 345 346 static inline void __dec_zone_page_state(struct page *page, 347 enum zone_stat_item item) 348 { 349 __dec_zone_state(page_zone(page), item); 350 } 351 352 static inline void __dec_node_page_state(struct page *page, 353 enum node_stat_item item) 354 { 355 __dec_node_state(page_pgdat(page), item); 356 } 357 358 359 /* 360 * We only use atomic operations to update counters. So there is no need to 361 * disable interrupts. 362 */ 363 #define inc_zone_page_state __inc_zone_page_state 364 #define dec_zone_page_state __dec_zone_page_state 365 #define mod_zone_page_state __mod_zone_page_state 366 367 #define inc_node_page_state __inc_node_page_state 368 #define dec_node_page_state __dec_node_page_state 369 #define mod_node_page_state __mod_node_page_state 370 371 #define inc_zone_state __inc_zone_state 372 #define inc_node_state __inc_node_state 373 #define dec_zone_state __dec_zone_state 374 375 #define set_pgdat_percpu_threshold(pgdat, callback) { } 376 377 static inline void refresh_zone_stat_thresholds(void) { } 378 static inline void cpu_vm_stats_fold(int cpu) { } 379 static inline void quiet_vmstat(void) { } 380 381 static inline void drain_zonestat(struct zone *zone, 382 struct per_cpu_pageset *pset) { } 383 #endif /* CONFIG_SMP */ 384 385 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, 386 int migratetype) 387 { 388 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); 389 if (is_migrate_cma(migratetype)) 390 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); 391 } 392 393 extern const char * const vmstat_text[]; 394 395 #endif /* _LINUX_VMSTAT_H */ 396