Managing Shared Resources in Power Aware System

Rodrigo SantosGiuseppe LipariMichael Trimarchi

Mobile and portable computing devices based on microprocessors, cellular phones, portable digital agendas (PDA), etc. represent today an important part in the consumer electronic market. The commercial success of these products greatly depends on the duration of the battery support. In order to consume minimal energy during power-up, sleep, idle and underloaded conditions, many Dynamic Voltage Scaling (DVS) techniques have been proposed. In this paper, we propose a technique based on the resource reservation paradigm. The paradigm is extended to cope with shared resources and critical sections. The bandwidth reserved to each task is controlled by means of a predictor and a feedback algorithm. Taking into account the total utilization factor demand for the processor the frequency and voltage are scaled to keep the overall bandwidth close to 100%.

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