Background Virtual memory can be implemented via: 1.Demand paging Paging technology pager(请求调页)and page replacement Pager VS.swapper the unit of swapping in/out is not the entire process but page. 2.Demand segmentation 4口”4814在，4色，主)QC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Background ▶ Virtual memory can be implemented via: 1. Demand paging ▶ Paging technology + pager (请求调页) and page replacement ▶ Pager VS. swapper the unit of swapping in/out is not the entire process but page. 2. Demand segmentation