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Author: Unknown
Subject: faults
Date: Sunday, 22 Nov 2020, 22:17:56

Is a fault on the page table only when the page cannot find its respective page frame in main memory, and thus must look at secondary memory, or is a fault for virtual addresses when it cannot be found in general? 

Upon a fault (assuming the former above), why does the page have to be added to memory? Can't it just stay in secondary storage and the map be updated with the address of the secondary storage location?
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