A kernel USES page descriptors to keep track of all physical pages. Each page frame has a corresponding page descriptor. In a page descriptor the information about state of page is stored.
内核用页描述符来确保能找到所有的页，每个页都有相应的页描述符，页描述符里存放这页状态的有关信息。
A kernel USES page descriptors to keep track of all physical pages. Each page frame has a corresponding page descriptor. In a page descriptor the information about state of page is stored.
内核用页描述符来确保能找到所有的页，每个页都有相应的页描述符，页描述符里存放这页状态的有关信息。
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