Nature, Published online: 25 February 2026; doi:10.1038/d41586-025-04161-7
She opened the star-patterned tissue paper and pulled out a mink jacket. "Happy Christmas," said the card that came with it, "and love from the Man in the Moon."
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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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