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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。关于这个话题，谷歌浏览器【最新下载地址】提供了深入分析
I tested the best Kindles to help you find the perfect e-reader
完美日记起家于“大牌平替”，从诞生之初就锚定高性价比、入门级、年轻学生党的用户标签。这种定位帮助它快速起量，但也给品牌套上了沉重的枷锁：在用户心智中，完美日记等同于“便宜、基础、平替”，这种认知一旦形成，极难改写。