Interview Questions - UNIX Memory Management

It's the nature of the processes that they refer only to the small subset of the total data space of the process. i.e. the process frequently calls the same subroutines or executes the loop instructions.

The set of pages that are referred by the process in the last "n", references, where "n" is called the window of the working set of the process.

The window of the working set of a process is the total number in which the process had referred the set of pages in the working set of the process.

Page fault is referred to the situation when the process addresses a page in the working set of the process but the process fails to locate the page in the working set. And on a page fault the kernel updates the working set by reading the page from the secondary device.