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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。业内人士推荐同城约会作为进阶阅读
The mission was Nasa's greatest failure and, without question, its finest hour.
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Unlimited Storage，详情可参考搜狗输入法2026
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