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6.1.2 Operating System
6.1.2.5 pagedaemon and pageout
When a page of virtual memory is accessed the kernel page table is checked to determine if the page is currently in physical memory. If it is not, a page fault is registered and the daemon, pagedaemon (SunOS 4.X), or pageout (SunOS 5.X), both as process id 2, is used to bring the page into memory from the disk. If necessary, the page daemon moves a page of physical memory to the swap device to make room for the new page in physical memory, and updates the page table.
Unix System Administration - 8 AUG 1996
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