How can we make schedutil even more effective?

Mobile platforms can feature some operating power points (OPPs) that are more energy-efficient than others at lower frequencies. The inefficient low-frequency OPPs can therefore be avoided in normal conditions, leading to better latency at no cost. The power cost of OPPs does not increase linearly with frequency, which gives some opportunities for smarter decisions: if the frequency can be increased when it would be beneficial for a low power bill, why not do it?

The proposed solution allows skipping low-frequency inefficient OPPs, as well as boosting the frequency when the CPU-utilization increase needs to be backed by a frequency increase. Since the reused heuristic does not perform well for that use case, a better alternative has been proposed by the audience: comparing some utilization signals to detect frequency ramp-up phases.