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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黎智英國安法案件：黎智英判囚20年，蘋果員工判囚6年9個月至10年2026年2月9日
"If there is a flood warning and our dogs are in the house it terrifies us because we both travel over an hour to and from work," she said.