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INTERVIEW QUESTIONS OPERATING SYSTEMS WINDOWS AND UNIX DETAILS
Question :
Under what circumstances do page faults occur? Describe the actions taken by the operating system when a page fault occurs?
Category Windows and Unix Interview Questions
Rating (3.6) By 36 users
Added on 10/25/2009
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Answers:

A page fault occurs when an access to a page that has not been brought into main memory takes place. The operating system verifies the memory access, aborting the program if it is invalid. If it is valid, a free frame is located and I/O is requested to read the needed page into the free frame. Upon completion of I/O, the process table and
page table are updated and the instruction is restarted.



when a process is executed with only few pages in memory,& when an instruction is encountered which refers to any instruction or data in some other page,which is not present in the main memory,a page fault occurs.



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