Differentiate between local allocation and global allocation

Differentiate between local allocation and global allocation of frames in the context of demand paging.

Solution

A local PRA is one is which a victim page is chosen among the pages of the same process that requires a new frame. That is the number of frames for each process is fixed. So LRU for a local policy means the page least recently used by this process

A global policy is one in which the choice of victim is made among all pages of all processes. A new process has no pages and, even if we didn\'t restrict the frame needed to a local one for the first page loaded, the process would remain with only one page. Perhaps wait until a process has been running a while before restricting it to existing frames or give the process an initial allocation of frames based on the size of the executable.