Virtual Memory Implementation Considerations

1. When should a process's pages be fetched?
   A process initially requires the first page containing its starting address (and some initial data structures), but thereafter when should each page be allocated?
   A VM system can employ demand paging in which a page is allocated only when a reference to it is made, or predictive pre-paging where pages are "intelligently" allocated before they are required.

2. Where in physical memory should pages be allocated?
   Should we use policies such as first-fit, best-fit, or next-fit (which we saw when discussing basic memory partitioning)?
   Does it matter?