alphaXiv Toggle
The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
，这一点在51吃瓜中也有详细论述
“二九暝”（注：闽南语的“除夕夜”）前的十几天，这张便签可能出现在家里的各个角落，随着她的日夜斟酌和食材价格变化，不时涂改调整。有一回，我甚至在厕所见到这张便签纸。
2. 分区：小于pivot的放左边，大于的放右边
俗话说，民以食为天。春节假期，两则关于“吃”的见闻，令人颇为感慨。