355 lines
9.7 KiB
C
355 lines
9.7 KiB
C
#ifndef _LINUX_VMSTAT_H
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#define _LINUX_VMSTAT_H
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#include <linux/types.h>
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#include <linux/percpu.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/vm_event_item.h>
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#include <linux/atomic.h>
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extern int sysctl_stat_interval;
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#ifdef CONFIG_VM_EVENT_COUNTERS
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/*
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* Light weight per cpu counter implementation.
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*
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* Counters should only be incremented and no critical kernel component
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* should rely on the counter values.
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*
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* Counters are handled completely inline. On many platforms the code
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* generated will simply be the increment of a global address.
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*/
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struct vm_event_state {
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unsigned long event[NR_VM_EVENT_ITEMS];
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};
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DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
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/*
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* vm counters are allowed to be racy. Use raw_cpu_ops to avoid the
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* local_irq_disable overhead.
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*/
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static inline void __count_vm_event(enum vm_event_item item)
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{
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raw_cpu_inc(vm_event_states.event[item]);
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}
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static inline void count_vm_event(enum vm_event_item item)
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{
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this_cpu_inc(vm_event_states.event[item]);
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}
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static inline void __count_vm_events(enum vm_event_item item, long delta)
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{
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raw_cpu_add(vm_event_states.event[item], delta);
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}
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static inline void count_vm_events(enum vm_event_item item, long delta)
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{
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this_cpu_add(vm_event_states.event[item], delta);
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}
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extern void all_vm_events(unsigned long *);
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extern void vm_events_fold_cpu(int cpu);
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#else
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/* Disable counters */
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static inline void count_vm_event(enum vm_event_item item)
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{
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}
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static inline void count_vm_events(enum vm_event_item item, long delta)
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{
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}
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static inline void __count_vm_event(enum vm_event_item item)
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{
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}
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static inline void __count_vm_events(enum vm_event_item item, long delta)
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{
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}
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static inline void all_vm_events(unsigned long *ret)
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{
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}
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static inline void vm_events_fold_cpu(int cpu)
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{
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}
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#endif /* CONFIG_VM_EVENT_COUNTERS */
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#ifdef CONFIG_NUMA_BALANCING
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#define count_vm_numa_event(x) count_vm_event(x)
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#define count_vm_numa_events(x, y) count_vm_events(x, y)
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#else
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#define count_vm_numa_event(x) do {} while (0)
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#define count_vm_numa_events(x, y) do { (void)(y); } while (0)
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#endif /* CONFIG_NUMA_BALANCING */
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#ifdef CONFIG_DEBUG_TLBFLUSH
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#define count_vm_tlb_event(x) count_vm_event(x)
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#define count_vm_tlb_events(x, y) count_vm_events(x, y)
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#else
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#define count_vm_tlb_event(x) do {} while (0)
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#define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
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#endif
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#ifdef CONFIG_DEBUG_VM_VMACACHE
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#define count_vm_vmacache_event(x) count_vm_event(x)
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#else
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#define count_vm_vmacache_event(x) do {} while (0)
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#endif
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#define __count_zid_vm_events(item, zid, delta) \
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__count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
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/*
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* Zone and node-based page accounting with per cpu differentials.
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*/
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extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
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extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
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static inline void zone_page_state_add(long x, struct zone *zone,
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enum zone_stat_item item)
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{
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atomic_long_add(x, &zone->vm_stat[item]);
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atomic_long_add(x, &vm_zone_stat[item]);
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}
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static inline void node_page_state_add(long x, struct pglist_data *pgdat,
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enum node_stat_item item)
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{
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atomic_long_add(x, &pgdat->vm_stat[item]);
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atomic_long_add(x, &vm_node_stat[item]);
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}
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static inline unsigned long global_page_state(enum zone_stat_item item)
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{
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long x = atomic_long_read(&vm_zone_stat[item]);
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#ifdef CONFIG_SMP
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if (x < 0)
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x = 0;
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#endif
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return x;
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}
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static inline unsigned long global_node_page_state(enum node_stat_item item)
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{
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long x = atomic_long_read(&vm_node_stat[item]);
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#ifdef CONFIG_SMP
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if (x < 0)
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x = 0;
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#endif
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return x;
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}
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static inline unsigned long zone_page_state(struct zone *zone,
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enum zone_stat_item item)
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{
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long x = atomic_long_read(&zone->vm_stat[item]);
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#ifdef CONFIG_SMP
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if (x < 0)
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x = 0;
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#endif
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return x;
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}
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/*
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* More accurate version that also considers the currently pending
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* deltas. For that we need to loop over all cpus to find the current
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* deltas. There is no synchronization so the result cannot be
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* exactly accurate either.
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*/
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static inline unsigned long zone_page_state_snapshot(struct zone *zone,
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enum zone_stat_item item)
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{
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long x = atomic_long_read(&zone->vm_stat[item]);
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#ifdef CONFIG_SMP
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int cpu;
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for_each_online_cpu(cpu)
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x += per_cpu_ptr(zone->pageset, cpu)->vm_stat_diff[item];
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if (x < 0)
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x = 0;
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#endif
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return x;
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}
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static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat,
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enum node_stat_item item)
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{
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long x = atomic_long_read(&pgdat->vm_stat[item]);
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#ifdef CONFIG_SMP
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int cpu;
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for_each_online_cpu(cpu)
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x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item];
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if (x < 0)
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x = 0;
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#endif
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return x;
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}
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#ifdef CONFIG_NUMA
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extern unsigned long sum_zone_node_page_state(int node,
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enum zone_stat_item item);
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extern unsigned long node_page_state(struct pglist_data *pgdat,
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enum node_stat_item item);
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#else
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#define sum_zone_node_page_state(node, item) global_page_state(item)
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#define node_page_state(node, item) global_node_page_state(item)
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#endif /* CONFIG_NUMA */
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#define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
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#define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
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#define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d)
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#define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d))
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#ifdef CONFIG_SMP
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void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
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void __inc_zone_page_state(struct page *, enum zone_stat_item);
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void __dec_zone_page_state(struct page *, enum zone_stat_item);
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void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
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void __inc_node_page_state(struct page *, enum node_stat_item);
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void __dec_node_page_state(struct page *, enum node_stat_item);
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void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
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void inc_zone_page_state(struct page *, enum zone_stat_item);
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void dec_zone_page_state(struct page *, enum zone_stat_item);
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void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
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void inc_node_page_state(struct page *, enum node_stat_item);
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void dec_node_page_state(struct page *, enum node_stat_item);
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extern void inc_node_state(struct pglist_data *, enum node_stat_item);
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extern void __inc_zone_state(struct zone *, enum zone_stat_item);
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extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
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extern void dec_zone_state(struct zone *, enum zone_stat_item);
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extern void __dec_zone_state(struct zone *, enum zone_stat_item);
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extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
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void quiet_vmstat(void);
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void cpu_vm_stats_fold(int cpu);
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void refresh_zone_stat_thresholds(void);
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struct ctl_table;
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int vmstat_refresh(struct ctl_table *, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
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int calculate_pressure_threshold(struct zone *zone);
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int calculate_normal_threshold(struct zone *zone);
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void set_pgdat_percpu_threshold(pg_data_t *pgdat,
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int (*calculate_pressure)(struct zone *));
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#else /* CONFIG_SMP */
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/*
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* We do not maintain differentials in a single processor configuration.
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* The functions directly modify the zone and global counters.
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*/
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static inline void __mod_zone_page_state(struct zone *zone,
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enum zone_stat_item item, long delta)
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{
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zone_page_state_add(delta, zone, item);
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}
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static inline void __mod_node_page_state(struct pglist_data *pgdat,
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enum node_stat_item item, int delta)
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{
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node_page_state_add(delta, pgdat, item);
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}
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static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
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{
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atomic_long_inc(&zone->vm_stat[item]);
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atomic_long_inc(&vm_zone_stat[item]);
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}
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static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
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{
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atomic_long_inc(&pgdat->vm_stat[item]);
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atomic_long_inc(&vm_node_stat[item]);
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}
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static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
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{
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atomic_long_dec(&zone->vm_stat[item]);
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atomic_long_dec(&vm_zone_stat[item]);
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}
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static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
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{
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atomic_long_dec(&pgdat->vm_stat[item]);
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atomic_long_dec(&vm_node_stat[item]);
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}
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static inline void __inc_zone_page_state(struct page *page,
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enum zone_stat_item item)
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{
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__inc_zone_state(page_zone(page), item);
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}
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static inline void __inc_node_page_state(struct page *page,
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enum node_stat_item item)
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{
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__inc_node_state(page_pgdat(page), item);
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}
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static inline void __dec_zone_page_state(struct page *page,
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enum zone_stat_item item)
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{
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__dec_zone_state(page_zone(page), item);
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}
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static inline void __dec_node_page_state(struct page *page,
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enum node_stat_item item)
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{
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__dec_node_state(page_pgdat(page), item);
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}
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/*
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* We only use atomic operations to update counters. So there is no need to
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* disable interrupts.
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*/
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#define inc_zone_page_state __inc_zone_page_state
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#define dec_zone_page_state __dec_zone_page_state
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#define mod_zone_page_state __mod_zone_page_state
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#define inc_node_page_state __inc_node_page_state
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#define dec_node_page_state __dec_node_page_state
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#define mod_node_page_state __mod_node_page_state
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#define inc_zone_state __inc_zone_state
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#define inc_node_state __inc_node_state
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#define dec_zone_state __dec_zone_state
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#define set_pgdat_percpu_threshold(pgdat, callback) { }
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static inline void refresh_zone_stat_thresholds(void) { }
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static inline void cpu_vm_stats_fold(int cpu) { }
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static inline void quiet_vmstat(void) { }
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static inline void drain_zonestat(struct zone *zone,
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struct per_cpu_pageset *pset) { }
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#endif /* CONFIG_SMP */
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static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
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int migratetype)
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{
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__mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
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if (is_migrate_cma(migratetype))
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__mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
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}
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extern const char * const vmstat_text[];
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#endif /* _LINUX_VMSTAT_H */
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