| 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 */ |