1 #ifndef _LINUX_VMSTAT_H 2 #define _LINUX_VMSTAT_H 3 4 #include <linux/types.h> 5 #include <linux/percpu.h> 6 #include <linux/mmzone.h> 7 #include <linux/vm_event_item.h> 8 #include <linux/atomic.h> 9 10 extern int sysctl_stat_interval; 11 12 #ifdef CONFIG_VM_EVENT_COUNTERS 13 /* 14 * Light weight per cpu counter implementation. 15 * 16 * Counters should only be incremented and no critical kernel component 17 * should rely on the counter values. 18 * 19 * Counters are handled completely inline. On many platforms the code 20 * generated will simply be the increment of a global address. 21 */ 22 23 struct vm_event_state { 24 unsigned long event[NR_VM_EVENT_ITEMS]; 25 }; 26 27 DECLARE_PER_CPU(struct vm_event_state, vm_event_states); 28 29 /* 30 * vm counters are allowed to be racy. Use raw_cpu_ops to avoid the 31 * local_irq_disable overhead. 32 */ 33 static inline void __count_vm_event(enum vm_event_item item) 34 { 35 raw_cpu_inc(vm_event_states.event[item]); 36 } 37 38 static inline void count_vm_event(enum vm_event_item item) 39 { 40 this_cpu_inc(vm_event_states.event[item]); 41 } 42 43 static inline void __count_vm_events(enum vm_event_item item, long delta) 44 { 45 raw_cpu_add(vm_event_states.event[item], delta); 46 } 47 48 static inline void count_vm_events(enum vm_event_item item, long delta) 49 { 50 this_cpu_add(vm_event_states.event[item], delta); 51 } 52 53 extern void all_vm_events(unsigned long *); 54 55 extern void vm_events_fold_cpu(int cpu); 56 57 #else 58 59 /* Disable counters */ 60 static inline void count_vm_event(enum vm_event_item item) 61 { 62 } 63 static inline void count_vm_events(enum vm_event_item item, long delta) 64 { 65 } 66 static inline void __count_vm_event(enum vm_event_item item) 67 { 68 } 69 static inline void __count_vm_events(enum vm_event_item item, long delta) 70 { 71 } 72 static inline void all_vm_events(unsigned long *ret) 73 { 74 } 75 static inline void vm_events_fold_cpu(int cpu) 76 { 77 } 78 79 #endif /* CONFIG_VM_EVENT_COUNTERS */ 80 81 #ifdef CONFIG_NUMA_BALANCING 82 #define count_vm_numa_event(x) count_vm_event(x) 83 #define count_vm_numa_events(x, y) count_vm_events(x, y) 84 #else 85 #define count_vm_numa_event(x) do {} while (0) 86 #define count_vm_numa_events(x, y) do { (void)(y); } while (0) 87 #endif /* CONFIG_NUMA_BALANCING */ 88 89 #ifdef CONFIG_DEBUG_TLBFLUSH 90 #define count_vm_tlb_event(x) count_vm_event(x) 91 #define count_vm_tlb_events(x, y) count_vm_events(x, y) 92 #else 93 #define count_vm_tlb_event(x) do {} while (0) 94 #define count_vm_tlb_events(x, y) do { (void)(y); } while (0) 95 #endif 96 97 #ifdef CONFIG_DEBUG_VM_VMACACHE 98 #define count_vm_vmacache_event(x) count_vm_event(x) 99 #else 100 #define count_vm_vmacache_event(x) do {} while (0) 101 #endif 102 103 #define __count_zid_vm_events(item, zid, delta) \ 104 __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta) 105 106 /* 107 * Zone and node-based page accounting with per cpu differentials. 108 */ 109 extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS]; 110 extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS]; 111 112 static inline void zone_page_state_add(long x, struct zone *zone, 113 enum zone_stat_item item) 114 { 115 atomic_long_add(x, &zone->vm_stat[item]); 116 atomic_long_add(x, &vm_zone_stat[item]); 117 } 118 119 static inline void node_page_state_add(long x, struct pglist_data *pgdat, 120 enum node_stat_item item) 121 { 122 atomic_long_add(x, &pgdat->vm_stat[item]); 123 atomic_long_add(x, &vm_node_stat[item]); 124 } 125 126 static inline unsigned long global_page_state(enum zone_stat_item item) 127 { 128 long x = atomic_long_read(&vm_zone_stat[item]); 129 #ifdef CONFIG_SMP 130 if (x < 0) 131 x = 0; 132 #endif 133 return x; 134 } 135 136 static inline unsigned long global_node_page_state(enum node_stat_item item) 137 { 138 long x = atomic_long_read(&vm_node_stat[item]); 139 #ifdef CONFIG_SMP 140 if (x < 0) 141 x = 0; 142 #endif 143 return x; 144 } 145 146 static inline unsigned long zone_page_state(struct zone *zone, 147 enum zone_stat_item item) 148 { 149 long x = atomic_long_read(&zone->vm_stat[item]); 150 #ifdef CONFIG_SMP 151 if (x < 0) 152 x = 0; 153 #endif 154 return x; 155 } 156 157 /* 158 * More accurate version that also considers the currently pending 159 * deltas. For that we need to loop over all cpus to find the current 160 * deltas. There is no synchronization so the result cannot be 161 * exactly accurate either. 162 */ 163 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 164 enum zone_stat_item item) 165 { 166 long x = atomic_long_read(&zone->vm_stat[item]); 167 168 #ifdef CONFIG_SMP 169 int cpu; 170 for_each_online_cpu(cpu) 171 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 172 173 if (x < 0) 174 x = 0; 175 #endif 176 return x; 177 } 178 179 static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat, 180 enum node_stat_item item) 181 { 182 long x = atomic_long_read(&pgdat->vm_stat[item]); 183 184 #ifdef CONFIG_SMP 185 int cpu; 186 for_each_online_cpu(cpu) 187 x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item]; 188 189 if (x < 0) 190 x = 0; 191 #endif 192 return x; 193 } 194 195 196 #ifdef CONFIG_NUMA 197 extern unsigned long sum_zone_node_page_state(int node, 198 enum zone_stat_item item); 199 extern unsigned long node_page_state(struct pglist_data *pgdat, 200 enum node_stat_item item); 201 #else 202 #define sum_zone_node_page_state(node, item) global_page_state(item) 203 #define node_page_state(node, item) global_node_page_state(item) 204 #endif /* CONFIG_NUMA */ 205 206 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 207 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 208 #define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d) 209 #define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d)) 210 211 #ifdef CONFIG_SMP 212 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long); 213 void __inc_zone_page_state(struct page *, enum zone_stat_item); 214 void __dec_zone_page_state(struct page *, enum zone_stat_item); 215 216 void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long); 217 void __inc_node_page_state(struct page *, enum node_stat_item); 218 void __dec_node_page_state(struct page *, enum node_stat_item); 219 220 void mod_zone_page_state(struct zone *, enum zone_stat_item, long); 221 void inc_zone_page_state(struct page *, enum zone_stat_item); 222 void dec_zone_page_state(struct page *, enum zone_stat_item); 223 224 void mod_node_page_state(struct pglist_data *, enum node_stat_item, long); 225 void inc_node_page_state(struct page *, enum node_stat_item); 226 void dec_node_page_state(struct page *, enum node_stat_item); 227 228 extern void inc_node_state(struct pglist_data *, enum node_stat_item); 229 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 230 extern void __inc_node_state(struct pglist_data *, enum node_stat_item); 231 extern void dec_zone_state(struct zone *, enum zone_stat_item); 232 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 233 extern void __dec_node_state(struct pglist_data *, enum node_stat_item); 234 235 void quiet_vmstat(void); 236 void cpu_vm_stats_fold(int cpu); 237 void refresh_zone_stat_thresholds(void); 238 239 struct ctl_table; 240 int vmstat_refresh(struct ctl_table *, int write, 241 void __user *buffer, size_t *lenp, loff_t *ppos); 242 243 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); 244 245 int calculate_pressure_threshold(struct zone *zone); 246 int calculate_normal_threshold(struct zone *zone); 247 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 248 int (*calculate_pressure)(struct zone *)); 249 #else /* CONFIG_SMP */ 250 251 /* 252 * We do not maintain differentials in a single processor configuration. 253 * The functions directly modify the zone and global counters. 254 */ 255 static inline void __mod_zone_page_state(struct zone *zone, 256 enum zone_stat_item item, long delta) 257 { 258 zone_page_state_add(delta, zone, item); 259 } 260 261 static inline void __mod_node_page_state(struct pglist_data *pgdat, 262 enum node_stat_item item, int delta) 263 { 264 node_page_state_add(delta, pgdat, item); 265 } 266 267 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 268 { 269 atomic_long_inc(&zone->vm_stat[item]); 270 atomic_long_inc(&vm_zone_stat[item]); 271 } 272 273 static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item) 274 { 275 atomic_long_inc(&pgdat->vm_stat[item]); 276 atomic_long_inc(&vm_node_stat[item]); 277 } 278 279 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 280 { 281 atomic_long_dec(&zone->vm_stat[item]); 282 atomic_long_dec(&vm_zone_stat[item]); 283 } 284 285 static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item) 286 { 287 atomic_long_dec(&pgdat->vm_stat[item]); 288 atomic_long_dec(&vm_node_stat[item]); 289 } 290 291 static inline void __inc_zone_page_state(struct page *page, 292 enum zone_stat_item item) 293 { 294 __inc_zone_state(page_zone(page), item); 295 } 296 297 static inline void __inc_node_page_state(struct page *page, 298 enum node_stat_item item) 299 { 300 __inc_node_state(page_pgdat(page), item); 301 } 302 303 304 static inline void __dec_zone_page_state(struct page *page, 305 enum zone_stat_item item) 306 { 307 __dec_zone_state(page_zone(page), item); 308 } 309 310 static inline void __dec_node_page_state(struct page *page, 311 enum node_stat_item item) 312 { 313 __dec_node_state(page_pgdat(page), item); 314 } 315 316 317 /* 318 * We only use atomic operations to update counters. So there is no need to 319 * disable interrupts. 320 */ 321 #define inc_zone_page_state __inc_zone_page_state 322 #define dec_zone_page_state __dec_zone_page_state 323 #define mod_zone_page_state __mod_zone_page_state 324 325 #define inc_node_page_state __inc_node_page_state 326 #define dec_node_page_state __dec_node_page_state 327 #define mod_node_page_state __mod_node_page_state 328 329 #define inc_zone_state __inc_zone_state 330 #define inc_node_state __inc_node_state 331 #define dec_zone_state __dec_zone_state 332 333 #define set_pgdat_percpu_threshold(pgdat, callback) { } 334 335 static inline void refresh_zone_stat_thresholds(void) { } 336 static inline void cpu_vm_stats_fold(int cpu) { } 337 static inline void quiet_vmstat(void) { } 338 339 static inline void drain_zonestat(struct zone *zone, 340 struct per_cpu_pageset *pset) { } 341 #endif /* CONFIG_SMP */ 342 343 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, 344 int migratetype) 345 { 346 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); 347 if (is_migrate_cma(migratetype)) 348 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); 349 } 350 351 extern const char * const vmstat_text[]; 352 353 #endif /* _LINUX_VMSTAT_H */ 354