1 #ifndef _LINUX_VMSTAT_H 2 #define _LINUX_VMSTAT_H 3 4 #include <linux/types.h> 5 #include <linux/percpu.h> 6 #include <linux/mmzone.h> 7 #include <asm/atomic.h> 8 9 #ifdef CONFIG_VM_EVENT_COUNTERS 10 /* 11 * Light weight per cpu counter implementation. 12 * 13 * Counters should only be incremented and no critical kernel component 14 * should rely on the counter values. 15 * 16 * Counters are handled completely inline. On many platforms the code 17 * generated will simply be the increment of a global address. 18 */ 19 20 #ifdef CONFIG_ZONE_DMA32 21 #define DMA32_ZONE(xx) xx##_DMA32, 22 #else 23 #define DMA32_ZONE(xx) 24 #endif 25 26 #ifdef CONFIG_HIGHMEM 27 #define HIGHMEM_ZONE(xx) , xx##_HIGH 28 #else 29 #define HIGHMEM_ZONE(xx) 30 #endif 31 32 #define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) 33 34 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, 35 FOR_ALL_ZONES(PGALLOC), 36 PGFREE, PGACTIVATE, PGDEACTIVATE, 37 PGFAULT, PGMAJFAULT, 38 FOR_ALL_ZONES(PGREFILL), 39 FOR_ALL_ZONES(PGSTEAL), 40 FOR_ALL_ZONES(PGSCAN_KSWAPD), 41 FOR_ALL_ZONES(PGSCAN_DIRECT), 42 PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL, 43 PAGEOUTRUN, ALLOCSTALL, PGROTATED, 44 NR_VM_EVENT_ITEMS 45 }; 46 47 struct vm_event_state { 48 unsigned long event[NR_VM_EVENT_ITEMS]; 49 }; 50 51 DECLARE_PER_CPU(struct vm_event_state, vm_event_states); 52 53 static inline void __count_vm_event(enum vm_event_item item) 54 { 55 __get_cpu_var(vm_event_states).event[item]++; 56 } 57 58 static inline void count_vm_event(enum vm_event_item item) 59 { 60 get_cpu_var(vm_event_states).event[item]++; 61 put_cpu(); 62 } 63 64 static inline void __count_vm_events(enum vm_event_item item, long delta) 65 { 66 __get_cpu_var(vm_event_states).event[item] += delta; 67 } 68 69 static inline void count_vm_events(enum vm_event_item item, long delta) 70 { 71 get_cpu_var(vm_event_states).event[item] += delta; 72 put_cpu(); 73 } 74 75 extern void all_vm_events(unsigned long *); 76 extern void vm_events_fold_cpu(int cpu); 77 78 #else 79 80 /* Disable counters */ 81 #define get_cpu_vm_events(e) 0L 82 #define count_vm_event(e) do { } while (0) 83 #define count_vm_events(e,d) do { } while (0) 84 #define __count_vm_event(e) do { } while (0) 85 #define __count_vm_events(e,d) do { } while (0) 86 #define vm_events_fold_cpu(x) do { } while (0) 87 88 #endif /* CONFIG_VM_EVENT_COUNTERS */ 89 90 #define __count_zone_vm_events(item, zone, delta) \ 91 __count_vm_events(item##_DMA + zone_idx(zone), delta) 92 93 /* 94 * Zone based page accounting with per cpu differentials. 95 */ 96 extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 97 98 static inline void zone_page_state_add(long x, struct zone *zone, 99 enum zone_stat_item item) 100 { 101 atomic_long_add(x, &zone->vm_stat[item]); 102 atomic_long_add(x, &vm_stat[item]); 103 } 104 105 static inline unsigned long global_page_state(enum zone_stat_item item) 106 { 107 long x = atomic_long_read(&vm_stat[item]); 108 #ifdef CONFIG_SMP 109 if (x < 0) 110 x = 0; 111 #endif 112 return x; 113 } 114 115 static inline unsigned long zone_page_state(struct zone *zone, 116 enum zone_stat_item item) 117 { 118 long x = atomic_long_read(&zone->vm_stat[item]); 119 #ifdef CONFIG_SMP 120 if (x < 0) 121 x = 0; 122 #endif 123 return x; 124 } 125 126 #ifdef CONFIG_NUMA 127 /* 128 * Determine the per node value of a stat item. This function 129 * is called frequently in a NUMA machine, so try to be as 130 * frugal as possible. 131 */ 132 static inline unsigned long node_page_state(int node, 133 enum zone_stat_item item) 134 { 135 struct zone *zones = NODE_DATA(node)->node_zones; 136 137 return 138 #ifdef CONFIG_ZONE_DMA32 139 zone_page_state(&zones[ZONE_DMA32], item) + 140 #endif 141 zone_page_state(&zones[ZONE_NORMAL], item) + 142 #ifdef CONFIG_HIGHMEM 143 zone_page_state(&zones[ZONE_HIGHMEM], item) + 144 #endif 145 zone_page_state(&zones[ZONE_DMA], item); 146 } 147 148 extern void zone_statistics(struct zonelist *, struct zone *); 149 150 #else 151 152 #define node_page_state(node, item) global_page_state(item) 153 #define zone_statistics(_zl,_z) do { } while (0) 154 155 #endif /* CONFIG_NUMA */ 156 157 #define __add_zone_page_state(__z, __i, __d) \ 158 __mod_zone_page_state(__z, __i, __d) 159 #define __sub_zone_page_state(__z, __i, __d) \ 160 __mod_zone_page_state(__z, __i,-(__d)) 161 162 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) 163 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) 164 165 static inline void zap_zone_vm_stats(struct zone *zone) 166 { 167 memset(zone->vm_stat, 0, sizeof(zone->vm_stat)); 168 } 169 170 extern void inc_zone_state(struct zone *, enum zone_stat_item); 171 172 #ifdef CONFIG_SMP 173 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); 174 void __inc_zone_page_state(struct page *, enum zone_stat_item); 175 void __dec_zone_page_state(struct page *, enum zone_stat_item); 176 177 void mod_zone_page_state(struct zone *, enum zone_stat_item, int); 178 void inc_zone_page_state(struct page *, enum zone_stat_item); 179 void dec_zone_page_state(struct page *, enum zone_stat_item); 180 181 extern void inc_zone_state(struct zone *, enum zone_stat_item); 182 183 void refresh_cpu_vm_stats(int); 184 void refresh_vm_stats(void); 185 186 #else /* CONFIG_SMP */ 187 188 /* 189 * We do not maintain differentials in a single processor configuration. 190 * The functions directly modify the zone and global counters. 191 */ 192 static inline void __mod_zone_page_state(struct zone *zone, 193 enum zone_stat_item item, int delta) 194 { 195 zone_page_state_add(delta, zone, item); 196 } 197 198 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 199 { 200 atomic_long_inc(&zone->vm_stat[item]); 201 atomic_long_inc(&vm_stat[item]); 202 } 203 204 static inline void __inc_zone_page_state(struct page *page, 205 enum zone_stat_item item) 206 { 207 __inc_zone_state(page_zone(page), item); 208 } 209 210 static inline void __dec_zone_page_state(struct page *page, 211 enum zone_stat_item item) 212 { 213 atomic_long_dec(&page_zone(page)->vm_stat[item]); 214 atomic_long_dec(&vm_stat[item]); 215 } 216 217 /* 218 * We only use atomic operations to update counters. So there is no need to 219 * disable interrupts. 220 */ 221 #define inc_zone_page_state __inc_zone_page_state 222 #define dec_zone_page_state __dec_zone_page_state 223 #define mod_zone_page_state __mod_zone_page_state 224 225 static inline void refresh_cpu_vm_stats(int cpu) { } 226 static inline void refresh_vm_stats(void) { } 227 #endif 228 229 #endif /* _LINUX_VMSTAT_H */ 230