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In computing, a page fault (sometimes called PF or hard fault)[a] is an exception that the memory management unit (MMU) raises when a process accesses a memory page without proper preparations. Accessing the page requires a mapping to be added to the process's virtual address space. Besides, the actual page contents may need to be loaded from a backing store, such as a disk. The MMU detects the page fault, but the operating system's kernel handles the exception by making the required page accessible in the physical memory or denying an illegal memory access.
Valid page faults are common and necessary to increase the amount of memory available to programs in any operating system that uses virtual memory, such as Windows, macOS, and the Linux kernel.[1]
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^Bovet, Daniel; Cesati, Marco (November 2005). Understanding the Linux Kernel(PDF) (3rd ed.). O'Reilly Media. ISBN 0-596-00565-2. Retrieved 9 October 2021.
a pagefault (sometimes called PF or hard fault) is an exception that the memory management unit (MMU) raises when a process accesses a memory page without...
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the evicted page, another pagefault occurs and the page must be read back into RAM. The method the operating system uses to select the page frame to reuse...
disk, when a page of memory needs to be allocated. Page replacement happens when a requested page is not in memory (pagefault) and a free page cannot be...
page, that page frame will be reused. For a fault due to a write attempt into a read-protected page, if it is a copy-on-write page then a free page frame...
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the intervention of the page-fault handler. This variant has the advantage that the modifications required to the page-fault handler are very minor compared...
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automatic pagefault switching, with the main processor executing the OS and program instructions, and the "fixer" processor satisfying the pagefaults. When...
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