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 static inline void __count_vm_event(enum vm_event_item item) 31 { 32 __this_cpu_inc(vm_event_states.event[item]); 33 } 34 35 static inline void count_vm_event(enum vm_event_item item) 36 { 37 this_cpu_inc(vm_event_states.event[item]); 38 } 39 40 static inline void __count_vm_events(enum vm_event_item item, long delta) 41 { 42 __this_cpu_add(vm_event_states.event[item], delta); 43 } 44 45 static inline void count_vm_events(enum vm_event_item item, long delta) 46 { 47 this_cpu_add(vm_event_states.event[item], delta); 48 } 49 50 extern void all_vm_events(unsigned long *); 51 #ifdef CONFIG_HOTPLUG 52 extern void vm_events_fold_cpu(int cpu); 53 #else 54 static inline void vm_events_fold_cpu(int cpu) 55 { 56 } 57 #endif 58 59 #else 60 61 /* Disable counters */ 62 static inline void count_vm_event(enum vm_event_item item) 63 { 64 } 65 static inline void count_vm_events(enum vm_event_item item, long delta) 66 { 67 } 68 static inline void __count_vm_event(enum vm_event_item item) 69 { 70 } 71 static inline void __count_vm_events(enum vm_event_item item, long delta) 72 { 73 } 74 static inline void all_vm_events(unsigned long *ret) 75 { 76 } 77 static inline void vm_events_fold_cpu(int cpu) 78 { 79 } 80 81 #endif /* CONFIG_VM_EVENT_COUNTERS */ 82 83 #ifdef CONFIG_NUMA_BALANCING 84 #define count_vm_numa_event(x) count_vm_event(x) 85 #define count_vm_numa_events(x, y) count_vm_events(x, y) 86 #else 87 #define count_vm_numa_event(x) do {} while (0) 88 #define count_vm_numa_events(x, y) do { (void)(y); } while (0) 89 #endif /* CONFIG_NUMA_BALANCING */ 90 91 #define __count_zone_vm_events(item, zone, delta) \ 92 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ 93 zone_idx(zone), delta) 94 95 /* 96 * Zone based page accounting with per cpu differentials. 97 */ 98 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 99 100 static inline void zone_page_state_add(long x, struct zone *zone, 101 enum zone_stat_item item) 102 { 103 atomic_long_add(x, &zone->vm_stat[item]); 104 atomic_long_add(x, &vm_stat[item]); 105 } 106 107 static inline unsigned long global_page_state(enum zone_stat_item item) 108 { 109 long x = atomic_long_read(&vm_stat[item]); 110 #ifdef CONFIG_SMP 111 if (x < 0) 112 x = 0; 113 #endif 114 return x; 115 } 116 117 static inline unsigned long zone_page_state(struct zone *zone, 118 enum zone_stat_item item) 119 { 120 long x = atomic_long_read(&zone->vm_stat[item]); 121 #ifdef CONFIG_SMP 122 if (x < 0) 123 x = 0; 124 #endif 125 return x; 126 } 127 128 /* 129 * More accurate version that also considers the currently pending 130 * deltas. For that we need to loop over all cpus to find the current 131 * deltas. There is no synchronization so the result cannot be 132 * exactly accurate either. 133 */ 134 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 135 enum zone_stat_item item) 136 { 137 long x = atomic_long_read(&zone->vm_stat[item]); 138 139 #ifdef CONFIG_SMP 140 int cpu; 141 for_each_online_cpu(cpu) 142 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 143 144 if (x < 0) 145 x = 0; 146 #endif 147 return x; 148 } 149 150 extern unsigned long global_reclaimable_pages(void); 151 extern unsigned long zone_reclaimable_pages(struct zone *zone); 152 153 #ifdef CONFIG_NUMA 154 /* 155 * Determine the per node value of a stat item. This function 156 * is called frequently in a NUMA machine, so try to be as 157 * frugal as possible. 158 */ 159 static inline unsigned long node_page_state(int node, 160 enum zone_stat_item item) 161 { 162 struct zone *zones = NODE_DATA(node)->node_zones; 163 164 return 165 #ifdef CONFIG_ZONE_DMA 166 zone_page_state(&zones[ZONE_DMA], item) + 167 #endif 168 #ifdef CONFIG_ZONE_DMA32 169 zone_page_state(&zones[ZONE_DMA32], item) + 170 #endif 171 #ifdef CONFIG_HIGHMEM 172 zone_page_state(&zones[ZONE_HIGHMEM], item) + 173 #endif 174 zone_page_state(&zones[ZONE_NORMAL], item) + 175 zone_page_state(&zones[ZONE_MOVABLE], item); 176 } 177 178 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); 179 180 #else 181 182 #define node_page_state(node, item) global_page_state(item) 183 #define zone_statistics(_zl, _z, gfp) do { } while (0) 184 185 #endif /* CONFIG_NUMA */ 186 187 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 188 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 189 190 extern void inc_zone_state(struct zone *, enum zone_stat_item); 191 192 #ifdef CONFIG_SMP 193 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); 194 void __inc_zone_page_state(struct page *, enum zone_stat_item); 195 void __dec_zone_page_state(struct page *, enum zone_stat_item); 196 197 void mod_zone_page_state(struct zone *, enum zone_stat_item, int); 198 void inc_zone_page_state(struct page *, enum zone_stat_item); 199 void dec_zone_page_state(struct page *, enum zone_stat_item); 200 201 extern void inc_zone_state(struct zone *, enum zone_stat_item); 202 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 203 extern void dec_zone_state(struct zone *, enum zone_stat_item); 204 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 205 206 void refresh_cpu_vm_stats(int); 207 void refresh_zone_stat_thresholds(void); 208 209 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); 210 211 int calculate_pressure_threshold(struct zone *zone); 212 int calculate_normal_threshold(struct zone *zone); 213 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 214 int (*calculate_pressure)(struct zone *)); 215 #else /* CONFIG_SMP */ 216 217 /* 218 * We do not maintain differentials in a single processor configuration. 219 * The functions directly modify the zone and global counters. 220 */ 221 static inline void __mod_zone_page_state(struct zone *zone, 222 enum zone_stat_item item, int delta) 223 { 224 zone_page_state_add(delta, zone, item); 225 } 226 227 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 228 { 229 atomic_long_inc(&zone->vm_stat[item]); 230 atomic_long_inc(&vm_stat[item]); 231 } 232 233 static inline void __inc_zone_page_state(struct page *page, 234 enum zone_stat_item item) 235 { 236 __inc_zone_state(page_zone(page), item); 237 } 238 239 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 240 { 241 atomic_long_dec(&zone->vm_stat[item]); 242 atomic_long_dec(&vm_stat[item]); 243 } 244 245 static inline void __dec_zone_page_state(struct page *page, 246 enum zone_stat_item item) 247 { 248 __dec_zone_state(page_zone(page), item); 249 } 250 251 /* 252 * We only use atomic operations to update counters. So there is no need to 253 * disable interrupts. 254 */ 255 #define inc_zone_page_state __inc_zone_page_state 256 #define dec_zone_page_state __dec_zone_page_state 257 #define mod_zone_page_state __mod_zone_page_state 258 259 #define set_pgdat_percpu_threshold(pgdat, callback) { } 260 261 static inline void refresh_cpu_vm_stats(int cpu) { } 262 static inline void refresh_zone_stat_thresholds(void) { } 263 264 static inline void drain_zonestat(struct zone *zone, 265 struct per_cpu_pageset *pset) { } 266 #endif /* CONFIG_SMP */ 267 268 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, 269 int migratetype) 270 { 271 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); 272 if (is_migrate_cma(migratetype)) 273 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); 274 } 275 276 extern const char * const vmstat_text[]; 277 278 #endif /* _LINUX_VMSTAT_H */ 279