Preemption Control for Energy-Efficient Task Scheduling in Systems with a DVS Processor and Non-DVS Devices ∗

In reality, peripheral devices often make a significant con-tribution to the power consumption of the entire system. An ef-fective energy-efficient scheduling algorithm should consider not only the energy consumption of the processor but also the usages of devices. In this paper, we explore energy-efficient scheduling of periodic real-time tasks in a system with a dynamic-voltage-scaling (DVS) processor and multiple non-DVS system devices. We consider systems that any device used by a task remains operating while the task is active. We pro-pose scheduling algorithms in the management of task preemp-tion to reduce the energy consumption of devices. Simulation results show that our proposed algorithms could not only re-duce the number of task preemption significantly but also min-imize the energy consumption, compared to earliest-deadline-first scheduling