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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.。51吃瓜对此有专业解读
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国雅大厦北侧立体停车设施效果图。该大厦紧邻首都儿研所。受访者供图