We introduce a new OS principal called power sandbox, which enables one app to observe the fine-grained power consumption of itself running in its vertical slice of the hardware/software stack.
We present an analysis of existing approaches to app power awareness, demonstrate the inadequacies, and identify the cause as power entanglement rooted in OS resource multiplexing. In response, we present a novel OS principal called power sandbox that allows an app to observe the power of itself and its vertical environment.
We enforce psbox through two lightweight kernel extensions: resource ballooning and power state virtualization.
We confine the psbox performance cost to the sandboxed app with two techniques: tracking and charging lost sharing opportunities and encapsulating resource balllons as normal scheduling entities.
On top of the Linux kernel v4.4, we implement psbox for CPU, GPU, DSP, and WiFi interface, without disruptive kernel overhaul. Our evaluation shows that psbox reliably insulates power impacts, incurs minor cost, maintains fairness, and facilitates the construction of power-aware apps.
[EuroSys’18] "Power Sandbox: Power Awareness Redefined," Liwei Guo*, Tiantu Xu*, Mengwei Xu, Xuanzhe Liu, and Felix Xiaozhu Lin (*=co-primary), Proc. ACM EuroSys Conference, 2018.
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