Experiences in Managing Energy with ECOSystem

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Abstract
Mobile devices are becoming increasingly popular, from laptops, PDAs, and cell phones to emerging platforms such as wireless sensor networks. Available battery energy has become a critical mobile-system resource. A mobile device's usefulness is often limited not by its hardware's raw speed but by its battery's energy. Energy consumption is a major systems-design challenge. We designed our ECOSystem (Energy-Centric Operating System) prototype to manage energy consumption at the OS level, complementing existing power-management techniques, such as DVS and application adaptation. It's based on the ideas that energy management should be a system-wide effort, that we should explicitly recognize energy as a resource, and that we should unify energy management across the system. Even managing one hardware device might require coordination with other system components. Without unified management, application-level energy-saving efforts might not result in reduced energy consumption. ECOSystem incorporates the "currentcy model", which lets the operating system manage energy as a first-class resource. It can also express complex energy-related goals and behaviors, leading to more effective, unified management policies.

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