关于操作系统的内存管理，如何节省利用容量不大的内存为最多的进程提供资源，一直是研究的重要方向。而内存的虚拟存储管理，是现在最通用，最成功的方式—— 在内存有限的情况下，扩展一部分外存作为虚拟内存，真正的内存只存储当前运行时所用得到信息。这无疑极大地扩充了内存的功能，极大地提高了计算机的并发度。虚拟页式存储管理，则是将进程所需空间划分为多个页面，内存中只存放当前所需页面，其余页面放入外存的管理方式。 -About operating system memory management, how to save use of memory capacity is the most process to provide resources, has been one of the important research direction. And the virtual memory storage management, is now the most versatile, the most successful way-in memory is limited, as part of expansion CRT virtual memory, the real memory storage used when the current operation only get information. This undoubtedly greatly expanded memory function, which has greatly enhanced the computer concurrent degree. Virtual page type storage management, is needed for the process is divided into many pages space, memory storage needed only the current page, the rest of the page into the management method of CRT.