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.
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。关于这个话题，im钱包官方下载提供了深入分析
Links to Code Toggle，这一点在WPS官方版本下载中也有详细论述
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