FT App on Android & iOS
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.
，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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Maxim Konovalov Co-founder, Nginx