其结果是 aio 系统占用的内存和进程空间更少。
The result is that the aio system takes up less memory and process space.
根文件系统有一些魔力；其中包含的文件所占用的空间要比根文件系统本身的空间更大！
The root file system contains some magic; the files in it take up substantially more space than the root file system holds!
因此，操作系统必须尽可能占用少的空间。
Therefore, the operating system must be as thin as possible.
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