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