What is page fault and how to remove page fault?, Operating System

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What is page fault and what are the steps taken by the OS to remove page fault?

A page fault is caused while a page that hasn't been brought into memory is being addressed. The paging hardware now origins a page fault trap. This trap is a result of the OS malfunction to bring the desired page into memory. The procedure to eliminate the fault is

1. A confirms is made to see whether the reference is valid.

2. If reference is unacceptable then process is terminated else the page is brought into memory.

3. A free frame is found as well as a disk schedule is prepared to read the desired page into    frame.

4. When complete page table is updated along with the interrupted instruction is restarted.

 


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