9. Page replacement policy

This deals with the selection of a page in memory to be replaced when a new page must be brought in. one of the restrictions here is the frame locking. Some of the frames in main memory may be locked. When a frame is locke, the page currently stored in the frame may not be replace. The key control structures, the kernel of the operating syste,. Buffers and other time critical areas may be locked into main memory frames. Locking is achieved by associating a lock bit with each frame.

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