DEMAND PAGING o Bring a page into memory only when it is needed ·Less I/O needed ·Less memory needed ·Faster response ·ore users o Page is needed =reference to it 。invalid reference→abort not-in-memory>bring to memory o Lazy swapper-never swaps a page into memory unless page will be needed Swapper that deals with pages is a pagerDEMAND PAGING  Bring a page into memory only when it is needed  Less I/O needed  Less memory needed  Faster response  More users  Page is needed  reference to it  invalid reference  abort  not-in-memory  bring to memory  Lazy swapper – never swaps a page into memory unless page will be needed  Swapper that deals with pages is a pager