#ifndef _LINUX_VMSTAT_H #define _LINUX_VMSTAT_H #include <linux/types.h> #include <linux/percpu.h> #include <linux/config.h> #include <linux/mmzone.h> #include <asm/atomic.h> #ifdef CONFIG_VM_EVENT_COUNTERS /* * Light weight per cpu counter implementation. * * Counters should only be incremented and no critical kernel component * should rely on the counter values. * * Counters are handled completely inline. On many platforms the code * generated will simply be the increment of a global address. */ #define FOR_ALL_ZONES(x) x##_DMA, x##_DMA32, x##_NORMAL, x##_HIGH enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, FOR_ALL_ZONES(PGALLOC), PGFREE, PGACTIVATE, PGDEACTIVATE, PGFAULT, PGMAJFAULT, FOR_ALL_ZONES(PGREFILL), FOR_ALL_ZONES(PGSTEAL), FOR_ALL_ZONES(PGSCAN_KSWAPD), FOR_ALL_ZONES(PGSCAN_DIRECT), PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL, PAGEOUTRUN, ALLOCSTALL, PGROTATED, NR_VM_EVENT_ITEMS }; struct vm_event_state { unsigned long event[NR_VM_EVENT_ITEMS]; }; DECLARE_PER_CPU(struct vm_event_state, vm_event_states); static inline void __count_vm_event(enum vm_event_item item) { __get_cpu_var(vm_event_states.event[item])++; } static inline void count_vm_event(enum vm_event_item item) { get_cpu_var(vm_event_states.event[item])++; put_cpu(); } static inline void __count_vm_events(enum vm_event_item item, long delta) { __get_cpu_var(vm_event_states.event[item]) += delta; } static inline void count_vm_events(enum vm_event_item item, long delta) { get_cpu_var(vm_event_states.event[item])++; put_cpu(); } extern void all_vm_events(unsigned long *); extern void vm_events_fold_cpu(int cpu); #else /* Disable counters */ #define get_cpu_vm_events(e) 0L #define count_vm_event(e) do { } while (0) #define count_vm_events(e,d) do { } while (0) #define __count_vm_event(e) do { } while (0) #define __count_vm_events(e,d) do { } while (0) #define vm_events_fold_cpu(x) do { } while (0) #endif /* CONFIG_VM_EVENT_COUNTERS */ #define __count_zone_vm_events(item, zone, delta) \ __count_vm_events(item##_DMA + zone_idx(zone), delta) /* * Zone based page accounting with per cpu differentials. */ extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; static inline void zone_page_state_add(long x, struct zone *zone, enum zone_stat_item item) { atomic_long_add(x, &zone->vm_stat[item]); atomic_long_add(x, &vm_stat[item]); } static inline unsigned long global_page_state(enum zone_stat_item item) { long x = atomic_long_read(&vm_stat[item]); #ifdef CONFIG_SMP if (x < 0) x = 0; #endif return x; } static inline unsigned long zone_page_state(struct zone *zone, enum zone_stat_item item) { long x = atomic_long_read(&zone->vm_stat[item]); #ifdef CONFIG_SMP if (x < 0) x = 0; #endif return x; } #ifdef CONFIG_NUMA /* * Determine the per node value of a stat item. This function * is called frequently in a NUMA machine, so try to be as * frugal as possible. */ static inline unsigned long node_page_state(int node, enum zone_stat_item item) { struct zone *zones = NODE_DATA(node)->node_zones; return #ifndef CONFIG_DMA_IS_NORMAL #if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64 zone_page_state(&zones[ZONE_DMA32], item) + #endif zone_page_state(&zones[ZONE_NORMAL], item) + #endif #ifdef CONFIG_HIGHMEM zone_page_state(&zones[ZONE_HIGHMEM], item) + #endif zone_page_state(&zones[ZONE_DMA], item); } extern void zone_statistics(struct zonelist *, struct zone *); #else #define node_page_state(node, item) global_page_state(item) #define zone_statistics(_zl,_z) do { } while (0) #endif /* CONFIG_NUMA */ #define __add_zone_page_state(__z, __i, __d) \ __mod_zone_page_state(__z, __i, __d) #define __sub_zone_page_state(__z, __i, __d) \ __mod_zone_page_state(__z, __i,-(__d)) #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d) #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d)) static inline void zap_zone_vm_stats(struct zone *zone) { memset(zone->vm_stat, 0, sizeof(zone->vm_stat)); } extern void inc_zone_state(struct zone *, enum zone_stat_item); #ifdef CONFIG_SMP void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int); void __inc_zone_page_state(struct page *, enum zone_stat_item); void __dec_zone_page_state(struct page *, enum zone_stat_item); void mod_zone_page_state(struct zone *, enum zone_stat_item, int); void inc_zone_page_state(struct page *, enum zone_stat_item); void dec_zone_page_state(struct page *, enum zone_stat_item); extern void inc_zone_state(struct zone *, enum zone_stat_item); void refresh_cpu_vm_stats(int); void refresh_vm_stats(void); #else /* CONFIG_SMP */ /* * We do not maintain differentials in a single processor configuration. * The functions directly modify the zone and global counters. */ static inline void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, int delta) { zone_page_state_add(delta, zone, item); } static inline void __inc_zone_page_state(struct page *page, enum zone_stat_item item) { atomic_long_inc(&page_zone(page)->vm_stat[item]); atomic_long_inc(&vm_stat[item]); } static inline void __dec_zone_page_state(struct page *page, enum zone_stat_item item) { atomic_long_dec(&page_zone(page)->vm_stat[item]); atomic_long_dec(&vm_stat[item]); } /* * We only use atomic operations to update counters. So there is no need to * disable interrupts. */ #define inc_zone_page_state __inc_zone_page_state #define dec_zone_page_state __dec_zone_page_state #define mod_zone_page_state __mod_zone_page_state static inline void refresh_cpu_vm_stats(int cpu) { } static inline void refresh_vm_stats(void) { } #endif #endif /* _LINUX_VMSTAT_H */