Saturday, 7 September 2013

page faults

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

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