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Under what circumstances do page faults occur? Describe the actions taken by the operating system when a page fault occurs?

 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.
Asked by: Interview Candidate | Asked on: Mar 6th, 2005

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