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What (who) is page fault - definition

WHEN A RUNNING PROGRAM ACCESSES A MEMORY PAGE THAT IS NOT CURRENTLY MAPPED BY THE MMU INTO THE VIRTUAL ADDRESS SPACE OF A PROCESS

Invalid page fault; Pagefault; Hard fault

page fault

<memory management> In a paged virtual memory system, an access to a page (block) of memory that is not currently mapped to physical memory. When a page fault occurs the operating system either fetches the page in from {secondary storage} (usually disk) if the access was legitimate or otherwise reports the access as illegal. (1995-11-11)

Page fault

In computing, a page fault (sometimes called PF or hard fault) 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.

https://en.wikipedia.org/wiki/Page_fault

Electrical fault

ABNORMAL ELECTRIC CURRENT

Asymmetric fault; Symmetric fault; Transient fault; Persistent fault; Fault current; Electrical faults; Prospective fault current; Earth fault; Restricted earth fault; Fault (electric); Ground Fault; Ground fault; SLGF; Single line to ground fault; Line to line fault; Double line to ground fault; DLGF; Double line-to-ground fault; Line-to-line fault; Bolted fault; Line-to-ground fault; Single line-to-ground fault; Fault (power engineering); Through fault; Incipient fault; Internal fault

In an electric power system, a fault or fault current is any abnormal electric current. For example, a short circuit is a fault in which a live wire touches a neutral or ground wire.

https://en.wikipedia.org/wiki/Electrical_fault

Wikipedia

Page fault

In computing, a page fault (sometimes called PF or hard fault) 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.

https://en.wikipedia.org/wiki/Page fault