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Page Fault

Overview#

Page Fault is a type of exception raised by computer hardware when a running program accesses a memory page that is not currently mapped by the memory management unit (MMU) into the Virtual Memory address space of a process.

The processor's MMU detects the page fault, while the exception handling software that handles Page Faults is generally a part of the Operating System kernel. When handling a page fault, the Operating System generally tries to make the required page accessible, perhaps retrieving the page from Swap Space, at a location in physical memory, or terminates the program in case of an illegal memory access.

Page Fault is a type of Cache miss

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