Device power management for real-time embedded systems

摘要

A large part of power dissipation in a system is generated by I/O devices. Increasingly these devices provide powersaving mechanisms to inter alia enhance battery life. While I/O device scheduling has been studied in the past forrealtime systems, the use of energy resources by these scheduling algorithms may be improved. These approaches arecrafted considering a huge overhead of device transition. The technology enhancement has allowed the hardwarevendors to reduce the device transition overhead and energy consumption. We propose an intra-task device schedulingalgorithm for real time systems that allows to shut-down devices while ensuring the system schedulability. Our resultsshow an energy gain of up to 90% in the best case when compared to the state-of-the-art.