Swapping is the moving of an entire process to and from secondary storage when the main
memory is low. Many modern operating systems, including Linux, do not use this approach,
mainly because context switches are very expensive. Instead, they use paging. In Linux,
swapping is performed at the page level rather than at the process level
翻译 ：Swapping 是在物理内存不足时，把“整个进程”移出物理内存到第2个存储设备上
许多现代的操作系统包括 linux 都不使用该方案，因为上下文的切换效率不高。取而代之的是
用（内存）分页的方式。在 linux 下，切换的粒度是 page 而不是整个进程。
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