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