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.
2026-02-27 00:00:00:03014249110http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142491.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142491.html11921 十四届全国人大常委会第二十一次会议分组审议全国人大常委会工作报告稿
，这一点在同城约会中也有详细论述
分析师观点出现分化。Evercore ISI 认为，IBM 早已向客户提供多种现代化路径，主机客户仍因可靠性、吞吐量、安全性等因素坚持使用该平台，并重申对 IBM 的「跑赢大盘」评级。
for (int i = 0; i < n - 1; i++) {