Power-efficient workqueues

Power-efficient workqueues were first introduced in the 3.11 kernel release; since then, fifty or so subsystems and drivers have been updated to use them. These workqueues can be especially useful on handheld devices (like tablets and smartphones), where power is at a premium. ARM platforms with power-efficient workqueues enabled on Ubuntu and Android have shown significant improvements in energy consumption (up to 15% for some use cases).

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