practical voltage scaling for mobile multimedia devices
This paper presents the design, implementation, and evaluation of a  practical  voltage scaling (PDVS) algorithm for mobile devices primarily running multimedia applications. PDVS seeks to minimize the total energy of the whole device while meeting multimedia timing requirements. To do this, PDVS extends traditional real-time scheduling by deciding  what execution speed  in addition to when to execute what applications. PDVS makes these decisions based on the discrete speed levels of the CPU, the total power of the device at different speeds, and the probability distribution of CPU demand of multimedia applications. We have implemented PDVS in the Linux kernel and evaluated it on an HP laptop. Our experimental results show that PDVS saves energy substantially without affecting multimedia performance. It saves energy by 14.4\% to 37.2\% compared to scheduling algorithms without voltage scaling and by up to 10.4\% compared to previous voltage scaling algorithms that assume an ideal CPU with continuous speeds and cubic power-speed relationship.
practical mobile multimedia multimedia timing device paper design implementation evaluation algorithm mobile device multimedia application applications energy meeting requirements real-time schedulability power probability distributed laptop experimentation performance scheduling algorithm continuation relationships mobile computing voltage-scaling power management