Page Fault Frequency

• Page fault : when request page not in primary memory
• Wait till something fails : then adjust !
• Use page fault frequency to adjust working set size (trying to satisfy many constraints in system) - i.e. multiple processes and page faults
• Demand Paging : Load pages only when requested - slow - but good if program changes behaviour rapidly
• Anticipatory or Pre- Paging : predict behaviour of program (based on locality of reference perhaps)