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Thank you, I'll try these.

Thank you for your answer. It seems I need working on the kernel, I guess maybe I can build it from the userspace govenor with a new daemon?

I was trying to optimize the latency of frequency changing (to approximate the upper bound, i.e., hardware latency). So I was wondering how large is the OS overhead, and if it is possible to skip some of them to get a speedup.

Thank you for your reply! Actually, I want to do some fine-grained control (micro second level), so I was wondering how can I change the frequency fastest.

Yeah, If I set these files to the same value CPU will stay in a fixed value. But how can the CPU know which frequency to set? If I want to know the change delay, how can I measure it? This command may not have enough precision?

Thank you for your reply! I have seen this before. But it does not explain the mechanism. E.g., if I change the min_frequency and max_frequency file, what will happen? How can I make sure the frequency is really changed?

In the documentation (https://www.kernel.org/doc/Documentation/cpu-freq/user-guide.txt) I found various ways to modify the CPU frequency. But I want to know what happens after a command is sent. E.g., if I change the frequency file, how can that influence the actual frequency?