本文介绍了 Windows NT 操作系统中虚拟内存管理器 (VMM) 的工作原理。VMM 通过将所有内存划分为等大的页面来管理内存，每个页面大小为 4096 字节。为了应对有限的物理内存，VMM 利用硬盘上的交换文件来存储不活动的内存页面，从而实现更多的虚拟内存。此外，这些交换文件可以根据需求动态增长。
Very basic words:
The foundation for the system provides the answer to how VMM is able to perform these seemingly miraculous functions. VMM is constructed upon a page-based memory management scheme that divides all of memory into equal chunks called pages. Each page is 4096 bytes (4K) in size with no discrimination applied as to how a page is used. Everything in Windows NT—code, data, resources, files, dynamic memory, and so forth—is implemented using pages of physical memory.
Because everything in the system is realized via pages of physical memory, it is easy to see that pages of memory become scarce rather quickly. VMM employs the use of the hard disk to store unneeded pages of memory in one or more files called pagefiles. Pagefiles represent pages of data that are not currently being used, but may be needed spontaneously at any time. By swapping pages to and from pagefiles, the VMM is able to make pages of memory available to applications on demand and provide much more virtual memory than the available physical memory. Also, pagefiles in Windows NT are dynamic in size, allowing them to grow as the demands for pages of memory grow. In this way, Windows NT is able to provide virtually unlimited memory to the system.
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