Prior to page table assists in modern processors, hypervisors emulated the behavior of the memory management unit ( MMU). 在借助现代处理器中的页表协助之前,虚拟机管理程序会模仿内存管理单元(MMU)的行为。
This process can occur when a memory location is requested whose page is not in memory ( no mapping is present in the memory management unit [ MMU]). 该进程在请求存储位置时发生,存储位置的页面不在存储器中(在存储器管理单元[MMU]中无映射)。