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 00:00:00:0本报记者 张 洋 ——习近平总书记引领全党以正确政绩观干事创业，详情可参考Line官方版本下载
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He echoed conservationists' concerns that "a single major event could be catastrophic".
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