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.
用产品经理的心态对待咖啡，不断迭代好喝的咖啡。公众号：咖啡平方
。业内人士推荐快连下载安装作为进阶阅读
В Финляндии предупредили об опасном шаге ЕС против России09:28
持之以恒筑牢根基，确保长久守牢不发生规模性返贫致贫底线——