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principles of virtual memory

_ Hide the real memory from the user

_ Swapping

·        Remove a process temporarily from main memory to a backing store and later, bring it back into memory for

            continued execution

·        Swap-in and Swap-out

·        Suitable for round-robin scheduling by swapping processes in and out of main memory

             _ Quantum should be large enough such that swapping time is negligible

             _ Reasonable amount of computation should be done between swaps

_ Roll-out, Roll-in Swapping

·        Allows to preempt a lower priority process in favor of a higher priority process

·        After the higher priority process is done, the preempted process is continued