Pages on Demand
In a demand paging system, instead of loading all of a program's text and data at the time the program is dispatched, the system waits for a page to fault and then loads only the required page. This means that at any specific point only a small portion of a process's pages need be resident in physical memory. All first references to a page result in a page fault, but if a system has ample memory then eventually all of a process's pages will be mapped to physical pages and performance will be optimal. If the demand for pages exceeds the system's configured or available memory, then pages will have to be paged out before others may be paged in.
The HP-UX paging system is responsible for loading pages when they are first requested ...
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