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_HUGETLB_PAGE 47 HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL, 48 #endif 49 UNEVICTABLE_PGCULLED, /* culled to noreclaim list */ 50 UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */ 51 UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */ 52 UNEVICTABLE_PGMLOCKED, 53 UNEVICTABLE_PGMUNLOCKED, 54 UNEVICTABLE_PGCLEARED, /* on COW, page truncate */ 55 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */ 56 UNEVICTABLE_MLOCKFREED, 57 NR_VM_EVENT_ITEMS 58 }; 59 60 extern int sysctl_stat_interval; 61 62 #ifdef CONFIG_VM_EVENT_COUNTERS 63 /* 64 * Light weight per cpu counter implementation. 65 * 66 * Counters should only be incremented and no critical kernel component 67 * should rely on the counter values. 68 * 69 * Counters are handled completely inline. On many platforms the code 70 * generated will simply be the increment of a global address. 71 */ 72 73 struct vm_event_state { 74 unsigned long event[NR_VM_EVENT_ITEMS]; 75 }; 76 77 DECLARE_PER_CPU(struct vm_event_state, vm_event_states); 78 79 static inline void __count_vm_event(enum vm_event_item item) 80 { 81 __this_cpu_inc(vm_event_states.event[item]); 82 } 83 84 static inline void count_vm_event(enum vm_event_item item) 85 { 86 this_cpu_inc(vm_event_states.event[item]); 87 } 88 89 static inline void __count_vm_events(enum vm_event_item item, long delta) 90 { 91 __this_cpu_add(vm_event_states.event[item], delta); 92 } 93 94 static inline void count_vm_events(enum vm_event_item item, long delta) 95 { 96 this_cpu_add(vm_event_states.event[item], delta); 97 } 98 99 extern void all_vm_events(unsigned long *); 100 #ifdef CONFIG_HOTPLUG 101 extern void vm_events_fold_cpu(int cpu); 102 #else 103 static inline void vm_events_fold_cpu(int cpu) 104 { 105 } 106 #endif 107 108 #else 109 110 /* Disable counters */ 111 static inline void count_vm_event(enum vm_event_item item) 112 { 113 } 114 static inline void count_vm_events(enum vm_event_item item, long delta) 115 { 116 } 117 static inline void __count_vm_event(enum vm_event_item item) 118 { 119 } 120 static inline void __count_vm_events(enum vm_event_item item, long delta) 121 { 122 } 123 static inline void all_vm_events(unsigned long *ret) 124 { 125 } 126 static inline void vm_events_fold_cpu(int cpu) 127 { 128 } 129 130 #endif /* CONFIG_VM_EVENT_COUNTERS */ 131 132 #define __count_zone_vm_events(item, zone, delta) \ 133 __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ 134 zone_idx(zone), delta) 135 136 /* 137 * Zone based page accounting with per cpu differentials. 138 */ 139 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 140 141 static inline void zone_page_state_add(long x, struct zone *zone, 142 enum zone_stat_item item) 143 { 144 atomic_long_add(x, &zone->vm_stat[item]); 145 atomic_long_add(x, &vm_stat[item]); 146 } 147 148 static inline unsigned long global_page_state(enum zone_stat_item item) 149 { 150 long x = atomic_long_read(&vm_stat[item]); 151 #ifdef CONFIG_SMP 152 if (x < 0) 153 x = 0; 154 #endif 155 return x; 156 } 157 158 static inline unsigned long zone_page_state(struct zone *zone, 159 enum zone_stat_item item) 160 { 161 long x = atomic_long_read(&zone->vm_stat[item]); 162 #ifdef CONFIG_SMP 163 if (x < 0) 164 x = 0; 165 #endif 166 return x; 167 } 168 169 extern unsigned long global_reclaimable_pages(void); 170 extern unsigned long zone_reclaimable_pages(struct zone *zone); 171 172 #ifdef CONFIG_NUMA 173 /* 174 * Determine the per node value of a stat item. This function 175 * is called frequently in a NUMA machine, so try to be as 176 * frugal as possible. 177 */ 178 static inline unsigned long node_page_state(int node, 179 enum zone_stat_item item) 180 { 181 struct zone *zones = NODE_DATA(node)->node_zones; 182 183 return 184 #ifdef CONFIG_ZONE_DMA 185 zone_page_state(&zones[ZONE_DMA], item) + 186 #endif 187 #ifdef CONFIG_ZONE_DMA32 188 zone_page_state(&zones[ZONE_DMA32], item) + 189 #endif 190 #ifdef CONFIG_HIGHMEM 191 zone_page_state(&zones[ZONE_HIGHMEM], item) + 192 #endif 193 zone_page_state(&zones[ZONE_NORMAL], item) + 194 zone_page_state(&zones[ZONE_MOVABLE], item); 195 } 196 197 extern void zone_statistics(struct zone *, struct zone *); 198 199 #else 200 201 #define node_page_state(node, item) global_page_state(item) 202 #define zone_statistics(_zl,_z) do { } while (0) 203 204 #endif /* CONFIG_NUMA */ 205 206 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 207 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 208 209 static inline void zap_zone_vm_stats(struct zone *zone) 210 { 211 memset(zone->vm_stat, 0, sizeof(zone->vm_stat)); 212 } 213 214 extern void inc_zone_state(struct zone *, enum zone_stat_item); 215 216 #ifdef CONFIG_SMP 217 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); 218 void __inc_zone_page_state(struct page *, enum zone_stat_item); 219 void __dec_zone_page_state(struct page *, enum zone_stat_item); 220 221 void mod_zone_page_state(struct zone *, enum zone_stat_item, int); 222 void inc_zone_page_state(struct page *, enum zone_stat_item); 223 void dec_zone_page_state(struct page *, enum zone_stat_item); 224 225 extern void inc_zone_state(struct zone *, enum zone_stat_item); 226 extern void __inc_zone_state(struct zone *, enum zone_stat_item); 227 extern void dec_zone_state(struct zone *, enum zone_stat_item); 228 extern void __dec_zone_state(struct zone *, enum zone_stat_item); 229 230 void refresh_cpu_vm_stats(int); 231 #else /* CONFIG_SMP */ 232 233 /* 234 * We do not maintain differentials in a single processor configuration. 235 * The functions directly modify the zone and global counters. 236 */ 237 static inline void __mod_zone_page_state(struct zone *zone, 238 enum zone_stat_item item, int delta) 239 { 240 zone_page_state_add(delta, zone, item); 241 } 242 243 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 244 { 245 atomic_long_inc(&zone->vm_stat[item]); 246 atomic_long_inc(&vm_stat[item]); 247 } 248 249 static inline void __inc_zone_page_state(struct page *page, 250 enum zone_stat_item item) 251 { 252 __inc_zone_state(page_zone(page), item); 253 } 254 255 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 256 { 257 atomic_long_dec(&zone->vm_stat[item]); 258 atomic_long_dec(&vm_stat[item]); 259 } 260 261 static inline void __dec_zone_page_state(struct page *page, 262 enum zone_stat_item item) 263 { 264 __dec_zone_state(page_zone(page), item); 265 } 266 267 /* 268 * We only use atomic operations to update counters. So there is no need to 269 * disable interrupts. 270 */ 271 #define inc_zone_page_state __inc_zone_page_state 272 #define dec_zone_page_state __dec_zone_page_state 273 #define mod_zone_page_state __mod_zone_page_state 274 275 static inline void refresh_cpu_vm_stats(int cpu) { } 276 #endif 277 278 #endif /* _LINUX_VMSTAT_H */ 279