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 struct reclaim_stat { 24 unsigned nr_dirty; 25 unsigned nr_unqueued_dirty; 26 unsigned nr_congested; 27 unsigned nr_writeback; 28 unsigned nr_immediate; 29 unsigned nr_activate; 30 unsigned nr_ref_keep; 31 unsigned nr_unmap_fail; 32 }; 33 34 #ifdef CONFIG_VM_EVENT_COUNTERS 35 /* 36 * Light weight per cpu counter implementation. 37 * 38 * Counters should only be incremented and no critical kernel component 39 * should rely on the counter values. 40 * 41 * Counters are handled completely inline. On many platforms the code 42 * generated will simply be the increment of a global address. 43 */ 44 45 struct vm_event_state { 46 unsigned long event[NR_VM_EVENT_ITEMS]; 47 }; 48 49 DECLARE_PER_CPU(struct vm_event_state, vm_event_states); 50 51 /* 52 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the 53 * local_irq_disable overhead. 54 */ 55 static inline void __count_vm_event(enum vm_event_item item) 56 { 57 raw_cpu_inc(vm_event_states.event[item]); 58 } 59 60 static inline void count_vm_event(enum vm_event_item item) 61 { 62 this_cpu_inc(vm_event_states.event[item]); 63 } 64 65 static inline void __count_vm_events(enum vm_event_item item, long delta) 66 { 67 raw_cpu_add(vm_event_states.event[item], delta); 68 } 69 70 static inline void count_vm_events(enum vm_event_item item, long delta) 71 { 72 this_cpu_add(vm_event_states.event[item], delta); 73 } 74 75 extern void all_vm_events(unsigned long *); 76 77 extern void vm_events_fold_cpu(int cpu); 78 79 #else 80 81 /* Disable counters */ 82 static inline void count_vm_event(enum vm_event_item item) 83 { 84 } 85 static inline void count_vm_events(enum vm_event_item item, long delta) 86 { 87 } 88 static inline void __count_vm_event(enum vm_event_item item) 89 { 90 } 91 static inline void __count_vm_events(enum vm_event_item item, long delta) 92 { 93 } 94 static inline void all_vm_events(unsigned long *ret) 95 { 96 } 97 static inline void vm_events_fold_cpu(int cpu) 98 { 99 } 100 101 #endif /* CONFIG_VM_EVENT_COUNTERS */ 102 103 #ifdef CONFIG_NUMA_BALANCING 104 #define count_vm_numa_event(x) count_vm_event(x) 105 #define count_vm_numa_events(x, y) count_vm_events(x, y) 106 #else 107 #define count_vm_numa_event(x) do {} while (0) 108 #define count_vm_numa_events(x, y) do { (void)(y); } while (0) 109 #endif /* CONFIG_NUMA_BALANCING */ 110 111 #ifdef CONFIG_DEBUG_TLBFLUSH 112 #define count_vm_tlb_event(x) count_vm_event(x) 113 #define count_vm_tlb_events(x, y) count_vm_events(x, y) 114 #else 115 #define count_vm_tlb_event(x) do {} while (0) 116 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0) 117 #endif 118 119 #ifdef CONFIG_DEBUG_VM_VMACACHE 120 #define count_vm_vmacache_event(x) count_vm_event(x) 121 #else 122 #define count_vm_vmacache_event(x) do {} while (0) 123 #endif 124 125 #define __count_zid_vm_events(item, zid, delta) \ 126 __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta) 127 128 /* 129 * Zone and node-based page accounting with per cpu differentials. 130 */ 131 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS]; 132 extern atomic_long_t vm_numa_stat[NR_VM_NUMA_STAT_ITEMS]; 133 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS]; 134 135 #ifdef CONFIG_NUMA 136 static inline void zone_numa_state_add(long x, struct zone *zone, 137 enum numa_stat_item item) 138 { 139 atomic_long_add(x, &zone->vm_numa_stat[item]); 140 atomic_long_add(x, &vm_numa_stat[item]); 141 } 142 143 static inline unsigned long global_numa_state(enum numa_stat_item item) 144 { 145 long x = atomic_long_read(&vm_numa_stat[item]); 146 147 return x; 148 } 149 150 static inline unsigned long zone_numa_state_snapshot(struct zone *zone, 151 enum numa_stat_item item) 152 { 153 long x = atomic_long_read(&zone->vm_numa_stat[item]); 154 int cpu; 155 156 for_each_online_cpu(cpu) 157 x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item]; 158 159 return x; 160 } 161 #endif /* CONFIG_NUMA */ 162 163 static inline void zone_page_state_add(long x, struct zone *zone, 164 enum zone_stat_item item) 165 { 166 atomic_long_add(x, &zone->vm_stat[item]); 167 atomic_long_add(x, &vm_zone_stat[item]); 168 } 169 170 static inline void node_page_state_add(long x, struct pglist_data *pgdat, 171 enum node_stat_item item) 172 { 173 atomic_long_add(x, &pgdat->vm_stat[item]); 174 atomic_long_add(x, &vm_node_stat[item]); 175 } 176 177 static inline unsigned long global_zone_page_state(enum zone_stat_item item) 178 { 179 long x = atomic_long_read(&vm_zone_stat[item]); 180 #ifdef CONFIG_SMP 181 if (x < 0) 182 x = 0; 183 #endif 184 return x; 185 } 186 187 static inline unsigned long global_node_page_state(enum node_stat_item item) 188 { 189 long x = atomic_long_read(&vm_node_stat[item]); 190 #ifdef CONFIG_SMP 191 if (x < 0) 192 x = 0; 193 #endif 194 return x; 195 } 196 197 static inline unsigned long zone_page_state(struct zone *zone, 198 enum zone_stat_item item) 199 { 200 long x = atomic_long_read(&zone->vm_stat[item]); 201 #ifdef CONFIG_SMP 202 if (x < 0) 203 x = 0; 204 #endif 205 return x; 206 } 207 208 /* 209 * More accurate version that also considers the currently pending 210 * deltas. For that we need to loop over all cpus to find the current 211 * deltas. There is no synchronization so the result cannot be 212 * exactly accurate either. 213 */ 214 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 215 enum zone_stat_item item) 216 { 217 long x = atomic_long_read(&zone->vm_stat[item]); 218 219 #ifdef CONFIG_SMP 220 int cpu; 221 for_each_online_cpu(cpu) 222 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 223 224 if (x < 0) 225 x = 0; 226 #endif 227 return x; 228 } 229 230 #ifdef CONFIG_NUMA 231 extern void __inc_numa_state(struct zone *zone, enum numa_stat_item item); 232 extern unsigned long sum_zone_node_page_state(int node, 233 enum zone_stat_item item); 234 extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item); 235 extern unsigned long node_page_state(struct pglist_data *pgdat, 236 enum node_stat_item item); 237 #else 238 #define sum_zone_node_page_state(node, item) global_zone_page_state(item) 239 #define node_page_state(node, item) global_node_page_state(item) 240 #endif /* CONFIG_NUMA */ 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