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.
——“功成不必在我，功成必定有我”。同城约会对此有专业解读
https://feedx.net，这一点在heLLoword翻译官方下载中也有详细论述
В Финляндии предупредили об опасном шаге ЕС против России09:28
Source: Computational Materials Science, Volume 267