Section 12.1
Review Questions
Basic Concepts of Virtual Memory
  1. What is an overlay and when it is used?
answer...
a subprogram that replaces another overlay in memory when called. This is a way of reusing memory.
  1. In what year was virtual memory first implemented?
answer...
1961
  1. Match: 
              chunks of physical memory                       frames
          
              chunks of virtual memory                        pages
answer...
    chunks of physical memory ---->frames
    chunks of virtual memory  ---->pages
  1. How big are frames in relation to pages? Bigger, smaller or the same size?
answer...
same size
  1. What is the name of the area on the hard disk where pages that are not in current use are stored?
answer...
swap area
  1. What is demand paging?
answer...
when pages are copied into frames as they are referenced, not ahead of time
  1. What adjective do we use for a page that has been modified in memory and must be written back to disk before its frame can be reclaimed?
answer...
dirty