参照元†
- struct zone *zone
- enum zone_stat_item item
- long delta
返り値†
CONFIG_SMP 有効: linux-4.4.1/mm/vmstat.c†
/*
* For use when we know that interrupts are disabled,
* or when we know that preemption is disabled and that
* particular counter cannot be updated from interrupt context.
*/
void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
long delta)
{
struct per_cpu_pageset __percpu *pcp = zone->pageset;
s8 __percpu *p = pcp->vm_stat_diff + item;
long x;
long t;
x = delta + __this_cpu_read(*p);
t = __this_cpu_read(pcp->stat_threshold);
if (unlikely(x > t || x < -t)) {
zone_page_state_add(x, zone, item);
x = 0;
}
__this_cpu_write(*p, x);
}
EXPORT_SYMBOL(__mod_zone_page_state);
CONFIG_SMP 無効: linux-4.4.1/include/linux/vmstat.h†
/*
* 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, long delta)
{
zone_page_state_add(delta, zone, item);
}
コメント†