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 NR_VM_EVENT_ITEMS 62 }; 63 64 extern int sysctl_stat_interval; 65 66 #ifdef CONFIG_VM_EVENT_COUNTERS 67 /* 68 * Light weight per cpu counter implementation. 69 * 70 * Counters should only be incremented and no critical kernel component 71 * should rely on the counter values. 72 * 73 * Counters are handled completely inline. On many platforms the code 74 * generated will simply be the increment of a global address. 75 */ 76 77 struct vm_event_state { 78 unsigned long event[NR_VM_EVENT_ITEMS]; 79 }; 80 81 DECLARE_PER_CPU(struct vm_event_state, vm_event_states); 82 83 static inline void __count_vm_event(enum vm_event_item item) 84 { 85 __this_cpu_inc(vm_event_states.event[item]); 86 } 87 88 static inline void count_vm_event(enum vm_event_item item) 89 { 90 this_cpu_inc(vm_event_states.event[item]); 91 } 92 93 static inline void __count_vm_events(enum vm_event_item item, long delta) 94 { 95 __this_cpu_add(vm_event_states.event[item], delta); 96 } 97 98 static inline void count_vm_events(enum vm_event_item item, long delta) 99 { 100 this_cpu_add(vm_event_states.event[item], delta); 101 } 102 103 extern void all_vm_events(unsigned long *); 104 #ifdef CONFIG_HOTPLUG 105 extern void vm_events_fold_cpu(int cpu); 106 #else 107 static inline void vm_events_fold_cpu(int cpu) 108 { 109 } 110 #endif 111 112 #else 113 114 /* Disable counters */ 115 static inline void count_vm_event(enum vm_event_item item) 116 { 117 } 118 static inline void count_vm_events(enum vm_event_item item, long delta) 119 { 120 } 121 static inline void __count_vm_event(enum vm_event_item item) 122 { 123 } 124 static inline void __count_vm_events(enum vm_event_item item, long delta) 125 { 126 } 127 static inline void all_vm_events(unsigned long *ret) 128 { 129 } 130 static inline void vm_events_fold_cpu(int cpu) 131 { 132 } 133 134 #endif /* CONFIG_VM_EVENT_COUNTERS */ 135 136 #define __count_zone_vm_events(item, zone, delta) \ 137 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ 138 zone_idx(zone), delta) 139 140 /* 141 * Zone based page accounting with per cpu differentials. 142 */ 143 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 144 145 static inline void zone_page_state_add(long x, struct zone *zone, 146 enum zone_stat_item item) 147 { 148 atomic_long_add(x, &zone->vm_stat[item]); 149 atomic_long_add(x, &vm_stat[item]); 150 } 151 152 static inline unsigned long global_page_state(enum zone_stat_item item) 153 { 154 long x = atomic_long_read(&vm_stat[item]); 155 #ifdef CONFIG_SMP 156 if (x < 0) 157 x = 0; 158 #endif 159 return x; 160 } 161 162 static inline unsigned long zone_page_state(struct zone *zone, 163 enum zone_stat_item item) 164 { 165 long x = atomic_long_read(&zone->vm_stat[item]); 166 #ifdef CONFIG_SMP 167 if (x < 0) 168 x = 0; 169 #endif 170 return x; 171 } 172 173 /* 174 * More accurate version that also considers the currently pending 175 * deltas. For that we need to loop over all cpus to find the current 176 * deltas. There is no synchronization so the result cannot be 177 * exactly accurate either. 178 */ 179 static inline unsigned long zone_page_state_snapshot(struct zone *zone, 180 enum zone_stat_item item) 181 { 182 long x = atomic_long_read(&zone->vm_stat[item]); 183 184 #ifdef CONFIG_SMP 185 int cpu; 186 for_each_online_cpu(cpu) 187 x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item]; 188 189 if (x < 0) 190 x = 0; 191 #endif 192 return x; 193 } 194 195 extern unsigned long global_reclaimable_pages(void); 196 extern unsigned long zone_reclaimable_pages(struct zone *zone); 197 198 #ifdef CONFIG_NUMA 199 /* 200 * Determine the per node value of a stat item. This function 201 * is called frequently in a NUMA machine, so try to be as 202 * frugal as possible. 203 */ 204 static inline unsigned long node_page_state(int node, 205 enum zone_stat_item item) 206 { 207 struct zone *zones = NODE_DATA(node)->node_zones; 208 209 return 210 #ifdef CONFIG_ZONE_DMA 211 zone_page_state(&zones[ZONE_DMA], item) + 212 #endif 213 #ifdef CONFIG_ZONE_DMA32 214 zone_page_state(&zones[ZONE_DMA32], item) + 215 #endif 216 #ifdef CONFIG_HIGHMEM 217 zone_page_state(&zones[ZONE_HIGHMEM], item) + 218 #endif 219 zone_page_state(&zones[ZONE_NORMAL], item) + 220 zone_page_state(&zones[ZONE_MOVABLE], item); 221 } 222 223 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); 224 225 #else 226 227 #define node_page_state(node, item) global_page_state(item) 228 #define zone_statistics(_zl, _z, gfp) do { } while (0) 229 230 #endif /* CONFIG_NUMA */ 231 232 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 233 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 234 235 static inline void zap_zone_vm_stats(struct zone *zone) 236 { 237 memset(zone->vm_stat, 0, sizeof(zone->vm_stat)); 238 } 239 240 extern void inc_zone_state(struct zone *, enum zone_stat_item); 241 242 #ifdef CONFIG_SMP 243 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); 244 void __inc_zone_page_state(struct page *, enum zone_stat_item); 245 void __dec_zone_page_state(struct page *, enum zone_stat_item); 246 247 void mod_zone_page_state(struct zone *, enum zone_stat_item, int); 248 void inc_zone_page_state(struct page *, enum zone_stat_item); 249 void dec_zone_page_state(struct page *, enum zone_stat_item); 250 251 extern void inc_zone_state(struct zone *, enum zone_stat_item); 252 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 253 extern void dec_zone_state(struct zone *, enum zone_stat_item); 254 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 255 256 void refresh_cpu_vm_stats(int); 257 258 int calculate_pressure_threshold(struct zone *zone); 259 int calculate_normal_threshold(struct zone *zone); 260 void set_pgdat_percpu_threshold(pg_data_t *pgdat, 261 int (*calculate_pressure)(struct zone *)); 262 #else /* CONFIG_SMP */ 263 264 /* 265 * We do not maintain differentials in a single processor configuration. 266 * The functions directly modify the zone and global counters. 267 */ 268 static inline void __mod_zone_page_state(struct zone *zone, 269 enum zone_stat_item item, int delta) 270 { 271 zone_page_state_add(delta, zone, item); 272 } 273 274 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 275 { 276 atomic_long_inc(&zone->vm_stat[item]); 277 atomic_long_inc(&vm_stat[item]); 278 } 279 280 static inline void __inc_zone_page_state(struct page *page, 281 enum zone_stat_item item) 282 { 283 __inc_zone_state(page_zone(page), item); 284 } 285 286 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 287 { 288 atomic_long_dec(&zone->vm_stat[item]); 289 atomic_long_dec(&vm_stat[item]); 290 } 291 292 static inline void __dec_zone_page_state(struct page *page, 293 enum zone_stat_item item) 294 { 295 __dec_zone_state(page_zone(page), item); 296 } 297 298 /* 299 * We only use atomic operations to update counters. So there is no need to 300 * disable interrupts. 301 */ 302 #define inc_zone_page_state __inc_zone_page_state 303 #define dec_zone_page_state __dec_zone_page_state 304 #define mod_zone_page_state __mod_zone_page_state 305 306 #define set_pgdat_percpu_threshold(pgdat, callback) { } 307 308 static inline void refresh_cpu_vm_stats(int cpu) { } 309 #endif 310 311 #endif /* _LINUX_VMSTAT_H */ 312