Question

Explain any two elements of Virtual Memory.

Answer 1

Elements of virtual memory are:

1. Locality of reference
2. Page fault
3. Working set
4. Page replacement policy
5. Dirty page
6. Demand paging

• Page fault: When a page, which is not in main memory is referenced, then a page fault arises. At this time the O.S loads that page in main memory.
• Working set: The set of pages in physical memory which are actively referred to any moment is called as working set. Working set helps to decide page replacement policy.