| 释义 |
dirty bit
页面重写标志位
A bit, stored one per page in the page table, which is set to zero when a page is loaded and set to one by the microprogram or hardware whenever it is stored into. From this bit, the operating system can discover whether it need be rewritten or not.
在页面表中的每页存储的一个二进制位。当一页被取出时它置为0,每当该页被存入时就 由微程序或硬件置为1。根据这一位的值,操作系统可以发现这页是否需要重写。 |