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Power Capping Framework Proposed For Linux

Linux Kernel

Published on 03 August 2013 12:37 PM EDT
Written by Michael Larabel in Linux Kernel
6 Comments

A power capping framework has been proposed for the mainline Linux kernel to provide some standard interfaces for the increasing amount of drivers/hardware that support power monitoring and limiting.

More and more Linux hardware device drivers are becoming able to report their own individual power consumption (or estimated at least), some devices are able to set power limits on the device to not exceed a certain power consumption or threshold, and other features with regard to dynamic power control and maximizing performance in a power efficient driver. The Linux power capping framework is intended to provide a unified interface for userspace over sysfs for devices to expose their power capping functionality and to also have a unified driver API for implementing such features.

One example of a power capping driver already found on Linux is the Intel PowerClamp driver and its RAPL support.

Those wanting to find out more details on this proposed power capping framework can find a description along with the initial patch-set on the Linux kernel mailing list.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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