Page Replacement

Definition � page replacement occurs when processes have been allocated free frames such that only those pages needed by the processes are brought into memory until there are no more frames are available. When there is a need to use more pages and hence allocate more frames, a decision has to be made in order to replace a page currently in memory with one that is requiring admission.

• Modify/dirty bit functions

• Options to page replacement

Terminate user process

Swap out process

Reasons why not to use the above

Page-fault service routine

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