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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In addition to all these familiar faces, Survivor 50 incorporates fan-voted elements. These range from choosing the starting tribe colors to determining whether immunity idols would be in the game. One thing fans didn't vote on? The inclusion of celebrity guests, like Jimmy Fallon or Mr. Beast. — B.E.