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 #ifdef CONFIG_DEBUG_VM_VMACACHE 99 #define count_vm_vmacache_event(x) count_vm_event(x) 100 #else 101 #define count_vm_vmacache_event(x) do {} while (0) 102 #endif 103 104 #define __count_zone_vm_events(item, zone, delta) \ 105 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ 106 zone_idx(zone), delta) 107 108 /* 109 * Zone based page accounting with per cpu differentials. 110 */ 111 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 112 113 static inline void zone_page_state_add(long x, struct zone *zone, 114 enum zone_stat_item item) 115 { 116 atomic_long_add(x, &zone->vm_stat[item]); 117 atomic_long_add(x, &vm_stat[item]); 118 } 119 120 static inline unsigned long global_page_state(enum zone_stat_item item) 121 { 122 long x = atomic_long_read(&vm_stat[item]); 123 #ifdef CONFIG_SMP 124 if (x < 0) 125 x = 0; 126 #endif 127 return x; 128 } 129 130 static inline unsigned long zone_page_state(struct zone *zone, 131 enum zone_stat_item item) 132 { 133 long x = atomic_long_read(&zone->vm_stat[item]); 134 #ifdef CONFIG_SMP 135 if (x < 0) 136 x = 0; 137 #endif 138 return x; 139 } 140 141 /* 142 * More accurate version that also considers the currently pending 143 * deltas. For that we need to loop over all cpus to find the current 144 * deltas. There is no synchronization so the result cannot be 145 * exactly accurate either. 146 */ 147 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 148 enum zone_stat_item item) 149 { 150 long x = atomic_long_read(&zone->vm_stat[item]); 151 152 #ifdef CONFIG_SMP 153 int cpu; 154 for_each_online_cpu(cpu) 155 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 156 157 if (x < 0) 158 x = 0; 159 #endif 160 return x; 161 } 162 163 #ifdef CONFIG_NUMA 164 /* 165 * Determine the per node value of a stat item. This function 166 * is called frequently in a NUMA machine, so try to be as 167 * frugal as possible. 168 */ 169 static inline unsigned long node_page_state(int node, 170 enum zone_stat_item item) 171 { 172 struct zone *zones = NODE_DATA(node)->node_zones; 173 174 return 175 #ifdef CONFIG_ZONE_DMA 176 zone_page_state(&zones[ZONE_DMA], item) + 177 #endif 178 #ifdef CONFIG_ZONE_DMA32 179 zone_page_state(&zones[ZONE_DMA32], item) + 180 #endif 181 #ifdef CONFIG_HIGHMEM 182 zone_page_state(&zones[ZONE_HIGHMEM], item) + 183 #endif 184 zone_page_state(&zones[ZONE_NORMAL], item) + 185 zone_page_state(&zones[ZONE_MOVABLE], item); 186 } 187 188 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); 189 190 #else 191 192 #define node_page_state(node, item) global_page_state(item) 193 #define zone_statistics(_zl, _z, gfp) do { } while (0) 194 195 #endif /* CONFIG_NUMA */ 196 197 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 198 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 199 200 #ifdef CONFIG_SMP 201 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); 202 void __inc_zone_page_state(struct page *, enum zone_stat_item); 203 void __dec_zone_page_state(struct page *, enum zone_stat_item); 204 205 void mod_zone_page_state(struct zone *, enum zone_stat_item, int); 206 void inc_zone_page_state(struct page *, enum zone_stat_item); 207 void dec_zone_page_state(struct page *, enum zone_stat_item); 208 209 extern void inc_zone_state(struct zone *, enum zone_stat_item); 210 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 211 extern void dec_zone_state(struct zone *, enum zone_stat_item); 212 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 213 214 void cpu_vm_stats_fold(int cpu); 215 void refresh_zone_stat_thresholds(void); 216 217 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *); 218 219 int calculate_pressure_threshold(struct zone *zone); 220 int calculate_normal_threshold(struct zone *zone); 221 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 222 int (*calculate_pressure)(struct zone *)); 223 #else /* CONFIG_SMP */ 224 225 /* 226 * We do not maintain differentials in a single processor configuration. 227 * The functions directly modify the zone and global counters. 228 */ 229 static inline void __mod_zone_page_state(struct zone *zone, 230 enum zone_stat_item item, int delta) 231 { 232 zone_page_state_add(delta, zone, item); 233 } 234 235 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 236 { 237 atomic_long_inc(&zone->vm_stat[item]); 238 atomic_long_inc(&vm_stat[item]); 239 } 240 241 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 242 { 243 atomic_long_dec(&zone->vm_stat[item]); 244 atomic_long_dec(&vm_stat[item]); 245 } 246 247 static inline void __inc_zone_page_state(struct page *page, 248 enum zone_stat_item item) 249 { 250 __inc_zone_state(page_zone(page), item); 251 } 252 253 static inline void __dec_zone_page_state(struct page *page, 254 enum zone_stat_item item) 255 { 256 __dec_zone_state(page_zone(page), item); 257 } 258 259 /* 260 * We only use atomic operations to update counters. So there is no need to 261 * disable interrupts. 262 */ 263 #define inc_zone_page_state __inc_zone_page_state 264 #define dec_zone_page_state __dec_zone_page_state 265 #define mod_zone_page_state __mod_zone_page_state 266 267 #define inc_zone_state __inc_zone_state 268 #define dec_zone_state __dec_zone_state 269 270 #define set_pgdat_percpu_threshold(pgdat, callback) { } 271 272 static inline void refresh_cpu_vm_stats(int cpu) { } 273 static inline void refresh_zone_stat_thresholds(void) { } 274 static inline void cpu_vm_stats_fold(int cpu) { } 275 276 static inline void drain_zonestat(struct zone *zone, 277 struct per_cpu_pageset *pset) { } 278 #endif /* CONFIG_SMP */ 279 280 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages, 281 int migratetype) 282 { 283 __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); 284 if (is_migrate_cma(migratetype)) 285 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages); 286 } 287 288 extern const char * const vmstat_text[]; 289 290 #endif /* _LINUX_VMSTAT_H */ 291