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 <asm/atomic.h> 9 10 #ifdef CONFIG_ZONE_DMA 11 #define DMA_ZONE(xx) xx##_DMA, 12 #else 13 #define DMA_ZONE(xx) 14 #endif 15 16 #ifdef CONFIG_ZONE_DMA32 17 #define DMA32_ZONE(xx) xx##_DMA32, 18 #else 19 #define DMA32_ZONE(xx) 20 #endif 21 22 #ifdef CONFIG_HIGHMEM 23 #define HIGHMEM_ZONE(xx) , xx##_HIGH 24 #else 25 #define HIGHMEM_ZONE(xx) 26 #endif 27 28 29 #define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE 30 31 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, 32 FOR_ALL_ZONES(PGALLOC), 33 PGFREE, PGACTIVATE, PGDEACTIVATE, 34 PGFAULT, PGMAJFAULT, 35 FOR_ALL_ZONES(PGREFILL), 36 FOR_ALL_ZONES(PGSTEAL), 37 FOR_ALL_ZONES(PGSCAN_KSWAPD), 38 FOR_ALL_ZONES(PGSCAN_DIRECT), 39 #ifdef CONFIG_NUMA 40 PGSCAN_ZONE_RECLAIM_FAILED, 41 #endif 42 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL, 43 KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY, 44 KSWAPD_SKIP_CONGESTION_WAIT, 45 PAGEOUTRUN, ALLOCSTALL, PGROTATED, 46 #ifdef CONFIG_COMPACTION 47 COMPACTBLOCKS, COMPACTPAGES, COMPACTPAGEFAILED, 48 COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS, 49 #endif 50 #ifdef CONFIG_HUGETLB_PAGE 51 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL, 52 #endif 53 UNEVICTABLE_PGCULLED, /* culled to noreclaim list */ 54 UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */ 55 UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */ 56 UNEVICTABLE_PGMLOCKED, 57 UNEVICTABLE_PGMUNLOCKED, 58 UNEVICTABLE_PGCLEARED, /* on COW, page truncate */ 59 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */ 60 UNEVICTABLE_MLOCKFREED, 61 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 62 THP_FAULT_ALLOC, 63 THP_FAULT_FALLBACK, 64 THP_COLLAPSE_ALLOC, 65 THP_COLLAPSE_ALLOC_FAILED, 66 THP_SPLIT, 67 #endif 68 NR_VM_EVENT_ITEMS 69 }; 70 71 extern int sysctl_stat_interval; 72 73 #ifdef CONFIG_VM_EVENT_COUNTERS 74 /* 75 * Light weight per cpu counter implementation. 76 * 77 * Counters should only be incremented and no critical kernel component 78 * should rely on the counter values. 79 * 80 * Counters are handled completely inline. On many platforms the code 81 * generated will simply be the increment of a global address. 82 */ 83 84 struct vm_event_state { 85 unsigned long event[NR_VM_EVENT_ITEMS]; 86 }; 87 88 DECLARE_PER_CPU(struct vm_event_state, vm_event_states); 89 90 static inline void __count_vm_event(enum vm_event_item item) 91 { 92 __this_cpu_inc(vm_event_states.event[item]); 93 } 94 95 static inline void count_vm_event(enum vm_event_item item) 96 { 97 this_cpu_inc(vm_event_states.event[item]); 98 } 99 100 static inline void __count_vm_events(enum vm_event_item item, long delta) 101 { 102 __this_cpu_add(vm_event_states.event[item], delta); 103 } 104 105 static inline void count_vm_events(enum vm_event_item item, long delta) 106 { 107 this_cpu_add(vm_event_states.event[item], delta); 108 } 109 110 extern void all_vm_events(unsigned long *); 111 #ifdef CONFIG_HOTPLUG 112 extern void vm_events_fold_cpu(int cpu); 113 #else 114 static inline void vm_events_fold_cpu(int cpu) 115 { 116 } 117 #endif 118 119 #else 120 121 /* Disable counters */ 122 static inline void count_vm_event(enum vm_event_item item) 123 { 124 } 125 static inline void count_vm_events(enum vm_event_item item, long delta) 126 { 127 } 128 static inline void __count_vm_event(enum vm_event_item item) 129 { 130 } 131 static inline void __count_vm_events(enum vm_event_item item, long delta) 132 { 133 } 134 static inline void all_vm_events(unsigned long *ret) 135 { 136 } 137 static inline void vm_events_fold_cpu(int cpu) 138 { 139 } 140 141 #endif /* CONFIG_VM_EVENT_COUNTERS */ 142 143 #define __count_zone_vm_events(item, zone, delta) \ 144 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ 145 zone_idx(zone), delta) 146 147 /* 148 * Zone based page accounting with per cpu differentials. 149 */ 150 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 151 152 static inline void zone_page_state_add(long x, struct zone *zone, 153 enum zone_stat_item item) 154 { 155 atomic_long_add(x, &zone->vm_stat[item]); 156 atomic_long_add(x, &vm_stat[item]); 157 } 158 159 static inline unsigned long global_page_state(enum zone_stat_item item) 160 { 161 long x = atomic_long_read(&vm_stat[item]); 162 #ifdef CONFIG_SMP 163 if (x < 0) 164 x = 0; 165 #endif 166 return x; 167 } 168 169 static inline unsigned long zone_page_state(struct zone *zone, 170 enum zone_stat_item item) 171 { 172 long x = atomic_long_read(&zone->vm_stat[item]); 173 #ifdef CONFIG_SMP 174 if (x < 0) 175 x = 0; 176 #endif 177 return x; 178 } 179 180 /* 181 * More accurate version that also considers the currently pending 182 * deltas. For that we need to loop over all cpus to find the current 183 * deltas. There is no synchronization so the result cannot be 184 * exactly accurate either. 185 */ 186 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 187 enum zone_stat_item item) 188 { 189 long x = atomic_long_read(&zone->vm_stat[item]); 190 191 #ifdef CONFIG_SMP 192 int cpu; 193 for_each_online_cpu(cpu) 194 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 195 196 if (x < 0) 197 x = 0; 198 #endif 199 return x; 200 } 201 202 extern unsigned long global_reclaimable_pages(void); 203 extern unsigned long zone_reclaimable_pages(struct zone *zone); 204 205 #ifdef CONFIG_NUMA 206 /* 207 * Determine the per node value of a stat item. This function 208 * is called frequently in a NUMA machine, so try to be as 209 * frugal as possible. 210 */ 211 static inline unsigned long node_page_state(int node, 212 enum zone_stat_item item) 213 { 214 struct zone *zones = NODE_DATA(node)->node_zones; 215 216 return 217 #ifdef CONFIG_ZONE_DMA 218 zone_page_state(&zones[ZONE_DMA], item) + 219 #endif 220 #ifdef CONFIG_ZONE_DMA32 221 zone_page_state(&zones[ZONE_DMA32], item) + 222 #endif 223 #ifdef CONFIG_HIGHMEM 224 zone_page_state(&zones[ZONE_HIGHMEM], item) + 225 #endif 226 zone_page_state(&zones[ZONE_NORMAL], item) + 227 zone_page_state(&zones[ZONE_MOVABLE], item); 228 } 229 230 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); 231 232 #else 233 234 #define node_page_state(node, item) global_page_state(item) 235 #define zone_statistics(_zl, _z, gfp) do { } while (0) 236 237 #endif /* CONFIG_NUMA */ 238 239 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 240 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 241 242 static inline void zap_zone_vm_stats(struct zone *zone) 243 { 244 memset(zone->vm_stat, 0, sizeof(zone->vm_stat)); 245 } 246 247 extern void inc_zone_state(struct zone *, enum zone_stat_item); 248 249 #ifdef CONFIG_SMP 250 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); 251 void __inc_zone_page_state(struct page *, enum zone_stat_item); 252 void __dec_zone_page_state(struct page *, enum zone_stat_item); 253 254 void mod_zone_page_state(struct zone *, enum zone_stat_item, int); 255 void inc_zone_page_state(struct page *, enum zone_stat_item); 256 void dec_zone_page_state(struct page *, enum zone_stat_item); 257 258 extern void inc_zone_state(struct zone *, enum zone_stat_item); 259 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 260 extern void dec_zone_state(struct zone *, enum zone_stat_item); 261 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 262 263 void refresh_cpu_vm_stats(int); 264 265 int calculate_pressure_threshold(struct zone *zone); 266 int calculate_normal_threshold(struct zone *zone); 267 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 268 int (*calculate_pressure)(struct zone *)); 269 #else /* CONFIG_SMP */ 270 271 /* 272 * We do not maintain differentials in a single processor configuration. 273 * The functions directly modify the zone and global counters. 274 */ 275 static inline void __mod_zone_page_state(struct zone *zone, 276 enum zone_stat_item item, int delta) 277 { 278 zone_page_state_add(delta, zone, item); 279 } 280 281 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 282 { 283 atomic_long_inc(&zone->vm_stat[item]); 284 atomic_long_inc(&vm_stat[item]); 285 } 286 287 static inline void __inc_zone_page_state(struct page *page, 288 enum zone_stat_item item) 289 { 290 __inc_zone_state(page_zone(page), item); 291 } 292 293 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 294 { 295 atomic_long_dec(&zone->vm_stat[item]); 296 atomic_long_dec(&vm_stat[item]); 297 } 298 299 static inline void __dec_zone_page_state(struct page *page, 300 enum zone_stat_item item) 301 { 302 __dec_zone_state(page_zone(page), item); 303 } 304 305 /* 306 * We only use atomic operations to update counters. So there is no need to 307 * disable interrupts. 308 */ 309 #define inc_zone_page_state __inc_zone_page_state 310 #define dec_zone_page_state __dec_zone_page_state 311 #define mod_zone_page_state __mod_zone_page_state 312 313 #define set_pgdat_percpu_threshold(pgdat, callback) { } 314 315 static inline void refresh_cpu_vm_stats(int cpu) { } 316 #endif 317 318 #endif /* _LINUX_VMSTAT_H */ 319