双%%前缀，指明这是一个寄存器名。 单%指明操作数。 这帮组GCC辨别操作数和寄存器。
There are two %'s prefixed to the register name. This helps GCC to distinguish between the operands and registers. operands have a single % as prefix.
要辨别这二者，细节 API 添加了一个操作参数。
To distinguish between them, the details API adds an operation parameter.
大多数边界是很明显的：网络连接、进程与进程的通信、文件系统、操作系统接口等等，但是有些边界就不好辨别。
Most boundaries are obvious: network connections, process-to-process communication, file systems, operating system interfaces, and so on, but some boundaries are more subtle.
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