UNIX Programming and Technical

Q. What is called a page fault?

A. 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.

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UNIX Other Question
Q. What is the window of the working set of a process?

A. 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 Q. What are data structures that are used for Demand Paging?

A. Kernel contains 4 data structures for Demand paging. They are,
Page table entries,
Disk block descriptors,
Page frame data table (pfdata),
Swap-use table.