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Maggie 姐在新花都夜总会（图：南方人物周刊记者 方迎忠）
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.
Nov 25, 2025: Google initially determined this behavior was intended. We pushed back.