Effective Online Power Management with Adaptive Interplay of DVS and DPM for Embedded Real-Time System

Effective power management is an important design concern for modern embedded systems. In this paper, we present an effective framework to integrate both DVS and DPM to optimize the overall energy consumption. We propose an online algorithm to determine the optimal operating frequency and mode transition of a processor based on the runtime workload. Our algorithm runs in O(n) time, where n is the number of the events stored in the system buffer. A feasibility analysis is also presented, which serves as a criteria for setting the system buffer as well as runtime schedulabilty check. The evaluations with specifications of two commercial processors show that our algorithm is more energy-efficient compared to existing schemes in the literature.