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.
But analysis from the Nuffield Trust think tank suggests pay has fallen 5% since 2008 if CPI is used, compared with nearly 20% with RPI.
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