Calculating CPU Usage of a Process in Android

Question

I am trying to calculate the CPU usage of a process in Android as follows, however i am not sure if its right due to the output produced.

To convert from jiffie to

Answer 1

While it is true that on most Android devices the value will be 100, on some devices it could be a different value. That is because this value depends on the CPU's architecture. ARM CPUs would have 100 for the USER_HZ constant value but x86 CPUs would have 1000 as you can see here.