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.
Read our full Fujifilm Instax Mini Evo review.
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12月22日，一群野鸭和鸳鸯聚集在北海公园太液池上。图/IC photo