简介 把内存与外存有机的结合起来使用，从而得到一个容量很大的“内存”，这是虚拟内存。进程不完全载入，就叫虚存。可以分成按需取页和按需取段两种方式。
虚存计算机 VMC VirtualMemoryComputer ; [计] virtual memory machine ; [计] virtual memory computer
虚存储 virtual memory
虚存系统 VSS VirtualStorageSystem ; [计] virtual memory system ; virtual storage system
虚存策略 [计] virtual memory strategy
虚存结构 [计] virtual memory structure
虚存处理器 virtual processor
虚拟内存 Virtual memory ; SWAP ; page file ; Virtuing memory
虚存技术 [计] virtual memory technique
存在与虚无 Being and Nothingness ; Being and Nothingness; L'être et le néant ; existence and nothingness
The realization of page migration policy involves translation from physical addresses to virtual addresses in virtual memory area,it needs travel through all the process address space with traditional approaches, which is inefficient and costly.
页迁移策略的实现涉及到虚存系统中物理地址到虚拟地址的转换,传统做法需要遍历所有进程的虚拟地址空间,效率低、开销大。
参考来源 - 页迁移系统中反向页表技术的设计与实现 in C·2,447,543篇论文数据，部分数据来源于NoteExpress
虚存能比系统的物理内存大许多倍。
The virtual memory can be many times larger than the physical memory in the system.
王充从去虚存实出发，倡导耳目的感知、心意的思知、待问的学知。
The Ying Qi is the body and the Yang Qi is the spirit. Wang Chong advocated the power of perceptual recognition, thinking and learning in practice.
实例分析：MIPS R 3000上的一个简单的虚存和分页系统。
Case Study: a simple VM and paging system for the MIPS R3000.
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