Changing CPU governor of a rooted android device

Question

I'm developing an application which changes the CPU Governor of the rooted device. I know that I can get the current governor in "sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", but how do I change it?

Solution

First, from the directory you are, do:

#cat scaling_available_governors

Then you will get the output something like this:

ondemand userspace powersave performance

These are the governors your kernel supports. Now you can force the kernel to use one of them by running:

#echo "powersave" > scaling_governor

You will need root for this to work.