linux-5.15/zone_page_state_snapshot() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-5.15/zone_page_state_snapshot() へ行く。
  • 1 (2025-09-10 (水) 14:00:40)

参照元†

• linux-5.15/zone_page_state()
• linux-5.15/zone_watermark_ok_safe()

説明†

• パス: linux-5.15/include/linux/vmstat.h

• FIXME: これは何？
  • 説明

引数†

• struct zone *zone
  • linux-5.15/zone
• enum zone_stat_item item

返り値†

• unsigned long

参考†

実装†

/*
 * More accurate version that also considers the currently pending
 * deltas. For that we need to loop over all cpus to find the current
 * deltas. There is no synchronization so the result cannot be
 * exactly accurate either.
 */
static inline unsigned long zone_page_state_snapshot(struct zone *zone,
					enum zone_stat_item item)
{
	long x = atomic_long_read(&zone->vm_stat[item]);

#ifdef CONFIG_SMP
	int cpu;
	for_each_online_cpu(cpu)
		x += per_cpu_ptr(zone->per_cpu_zonestats, cpu)->vm_stat_diff[item];

	if (x < 0)
		x = 0;
#endif
	return x;
}

• • linux-5.15/atomic_long_read()
  • linux-5.15/for_each_online_cpu()
  • linux-5.15/per_cpu_ptr()

コメント†