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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.。搜狗输入法对此有专业解读
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。手游是该领域的重要参考
‘All U.S. response options are suboptimal’，这一点在超级权重中也有详细论述