Most Frequently Used (MFU) Page Replacement

The Most Frequently Used (MFU) is a page replacement strategy that selects the page with the highest number of accesses for replacement. It operates under the counterintuitive assumption that pages accessed most frequently may have completed their purpose and are less likely to be needed again soon.

How It Works

MFU maintains a count of how often each page is accessed. When a page fault occurs and all frames are full, MFU selects the page with the highest access count for replacement. This algorithm takes the approach that pages with high access counts have likely completed their active use cycle and are now less likely to be referenced again.

Advantages

Can be effective in certain specialized workloads where frequently accessed pages complete their usage patterns.
May perform well in scenarios where programs move through distinct phases of execution.
Provides an alternative approach when LFU proves ineffective for particular workloads.

Disadvantages

Generally performs worse than other algorithms in common usage scenarios.
Often counterintuitive, as it replaces pages that have demonstrated utility.
Requires the same overhead as LFU for tracking access counts.
Can lead to increased page faults when frequently used pages are still needed.