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.
「警方經常說，希望我們回到香港面對司法審訊。所以我認為，這正是他們想達到的目的。」，推荐阅读爱思助手下载最新版本获取更多信息
The writer has a simple interface: write(), writev() for batched writes, end() to signal completion, and abort() for errors. That's essentially it.，这一点在爱思助手下载最新版本中也有详细论述
正是基于需求扩容的预期、政策逐步松动、制造能力已然成熟三个因素，刘强东选择果断入场。