Editing Page fault (section)

=== Minor page fault ===
If the page is loaded in  memory at the time the fault is generated, but is not marked in the [[memory management unit]] as being loaded in memory, then it is called a ''minor'' or ''soft'' page fault. The page fault handler in the [[operating system]] merely needs to make the entry for that page in the memory management unit point to the page in memory and indicate that the page is loaded in memory; it does not need to read the page into memory. This could happen if the [[Shared memory (interprocess communication)|memory is shared]] by different programs and the page is already brought into memory for other programs.