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Procedure to handle page fault

If a process refers to a page that is not in physical memory then

• We check an internal table (page table) for this process to determine whether the reference was valid or invalid.  

• If the reference was invalid, we terminate the process, if it was valid but not yet brought in, we have to bring that from main memory.  

• Now we find a free frame in memory.

• Then we read the desired page into the newly allocated frame.

• When the disk read is complete, we modify the internal table to indicate that the page is now in memory.  

• We restart the instruction that was interrupted by the illegal address trap. Now the process can access the page as if it had always been in memory.

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