CHAPTER 9:VIRTUAL MEMORY o Background o Demand Paging o Copy-on-Write o Page Replacement o Allocation of Frames o Thrashing o Memory-Mapped Files o Allocating Kernel Memory o Other Considerations o Operating-System ExamplesCHAPTER 9: VIRTUAL MEMORY  Background  Demand Paging  Copy-on-Write  Page Replacement  Allocation of Frames  Thrashing  Memory-Mapped Files  Allocating Kernel Memory  Other Considerations  Operating-System Examples