Better suited for short copy
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.
，这一点在旺商聊官方下载中也有详细论述
Scientists warn that the debris is congesting space and threatens collision with rockets, the International Space Station, and our planet.
Израиль нанес удар по Ирану09:28