Difference between revisions of "Page fault"

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[[Category: OS Basics]]

Latest revision as of 19:03, 18 December 2018

A page fault is an event in a virtual memory system when the CPU makes a reference to a page in the current process' address space which is not 'resident' - i.e. it is currently on secondary storage, not in main memory.

When this happens, a trap results; before the faulting instruction can be re-started, the page has to be brought into main memory.