hi,powertop's developers .I am a student which recently studing power consumption of pc.I have known windows power monitor software Joulemeter. there are some papers introduce how it works . but i can't find the same documents that introduce the powertop. so i want to know the process of calculating the watts of those components .for example, how to calculate the cpu's power ? i have following questions : 1. does powertop use power model to calculate the power ? 2. does powertop use the utilization of cpu and combine some cpu's power model to calculate power ? 3.how to get those utilization ?use linux kernal function or directly read some data from cpu registers which likes intel power gadget ? thanks for you reading this email and hope you can reply soon .