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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"What we have found is certain weeks during the year there'll be a hundred bats in here, and then suddenly they will disappear," says Parker.。Line官方版本下载对此有专业解读
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