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 #define __count_zone_vm_events(item, zone, delta) \ 99 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ 100 zone_idx(zone), delta) 101 102 /* 103 * Zone based page accounting with per cpu differentials. 104 */ 105 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 106 107 static inline void zone_page_state_add(long x, struct zone *zone, 108 enum zone_stat_item item) 109 { 110 atomic_long_add(x, &zone->vm_stat[item]); 111 atomic_long_add(x, &vm_stat[item]); 112 } 113 114 static inline unsigned long global_page_state(enum zone_stat_item item) 115 { 116 long x = atomic_long_read(&vm_stat[item]); 117 #ifdef CONFIG_SMP 118 if (x < 0) 119 x = 0; 120 #endif 121 return x; 122 } 123 124 static inline unsigned long zone_page_state(struct zone *zone, 125 enum zone_stat_item item) 126 { 127 long x = atomic_long_read(&zone->vm_stat[item]); 128 #ifdef CONFIG_SMP 129 if (x < 0) 130 x = 0; 131 #endif 132 return x; 133 } 134 135 /* 136 * More accurate version that also considers the currently pending 137 * deltas. For that we need to loop over all cpus to find the current 138 * deltas. There is no synchronization so the result cannot be 139 * exactly accurate either. 140 */ 141 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 142 enum zone_stat_item item) 143 { 144 long x = atomic_long_read(&zone->vm_stat[item]); 145 146 #ifdef CONFIG_SMP 147 int cpu; 148 for_each_online_cpu(cpu) 149 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 150 151 if (x < 0) 152 x = 0; 153 #endif 154 return x; 155 } 156 157 #ifdef CONFIG_NUMA 158 /* 159 * Determine the per node value of a stat item. This function 160 * is called frequently in a NUMA machine, so try to be as 161 * frugal as possible. 162 */ 163 static inline unsigned long node_page_state(int node, 164 enum zone_stat_item item) 165 { 166 struct zone *zones = NODE_DATA(node)->node_zones; 167 168 return 169 #ifdef CONFIG_ZONE_DMA 170 zone_page_state(&zones[ZONE_DMA], item) + 171 #endif 172 #ifdef CONFIG_ZONE_DMA32 173 zone_page_state(&zones[ZONE_DMA32], item) + 174 #endif 175 #ifdef CONFIG_HIGHMEM 176 zone_page_state(&zones[ZONE_HIGHMEM], item) + 177 #endif 178 zone_page_state(&zones[ZONE_NORMAL], item) + 179 zone_page_state(&zones[ZONE_MOVABLE], item); 180 } 181 182 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); 183 184 #else 185 186 #define node_page_state(node, item) global_page_state(item) 187 #define zone_statistics(_zl, _z, gfp) do { } while (0) 188 189 #endif /* CONFIG_NUMA */ 190 191 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 192 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 193 194 #ifdef CONFIG_SMP 195 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); 196 void __inc_zone_page_state(struct page *, enum zone_stat_item); 197 void __dec_zone_page_state(struct page *, enum zone_stat_item); 198 199 void mod_zone_page_state(struct zone *, enum zone_stat_item, int); 200 void inc_zone_page_state(struct page *, enum zone_stat_item); 201 void dec_zone_page_state(struct page *, enum zone_stat_item); 202 203 extern void inc_zone_state(struct zone *, enum zone_stat_item); 204 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 205 extern void dec_zone_state(struct zone *, enum zone_stat_item); 206 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 207 208 void cpu_vm_stats_fold(int cpu); 209 void refresh_zone_stat_thresholds(void); 210 211 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); 212 213 int calculate_pressure_threshold(struct zone *zone); 214 int calculate_normal_threshold(struct zone *zone); 215 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 216 int (*calculate_pressure)(struct zone *)); 217 #else /* CONFIG_SMP */ 218 219 /* 220 * We do not maintain differentials in a single processor configuration. 221 * The functions directly modify the zone and global counters. 222 */ 223 static inline void __mod_zone_page_state(struct zone *zone, 224 enum zone_stat_item item, int delta) 225 { 226 zone_page_state_add(delta, zone, item); 227 } 228 229 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 230 { 231 atomic_long_inc(&zone->vm_stat[item]); 232 atomic_long_inc(&vm_stat[item]); 233 } 234 235 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 236 { 237 atomic_long_dec(&zone->vm_stat[item]); 238 atomic_long_dec(&vm_stat[item]); 239 } 240 241 static inline void __inc_zone_page_state(struct page *page, 242 enum zone_stat_item item) 243 { 244 __inc_zone_state(page_zone(page), item); 245 } 246 247 static inline void __dec_zone_page_state(struct page *page, 248 enum zone_stat_item item) 249 { 250 __dec_zone_state(page_zone(page), item); 251 } 252 253 /* 254 * We only use atomic operations to update counters. So there is no need to 255 * disable interrupts. 256 */ 257 #define inc_zone_page_state __inc_zone_page_state 258 #define dec_zone_page_state __dec_zone_page_state 259 #define mod_zone_page_state __mod_zone_page_state 260 261 #define inc_zone_state __inc_zone_state 262 #define dec_zone_state __dec_zone_state 263 264 #define set_pgdat_percpu_threshold(pgdat, callback) { } 265 266 static inline void refresh_cpu_vm_stats(int cpu) { } 267 static inline void refresh_zone_stat_thresholds(void) { } 268 static inline void cpu_vm_stats_fold(int cpu) { } 269 270 static inline void drain_zonestat(struct zone *zone, 271 struct per_cpu_pageset *pset) { } 272 #endif /* CONFIG_SMP */ 273 274 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, 275 int migratetype) 276 { 277 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); 278 if (is_migrate_cma(migratetype)) 279 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); 280 } 281 282 extern const char * const vmstat_text[]; 283 284 #endif /* _LINUX_VMSTAT_H */ 285