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