1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Published: A Power-Aware Scheduler For Linux

Linux Kernel

Published on 10 July 2013 05:44 AM EDT
Written by Michael Larabel in Linux Kernel
1 Comment

A Linux kernel scheduler that's power-aware and aims for offering power-efficient performance has been published. The developer behind this new Linux scheduler is presently seeking other developer feedback on his set of nine patches.

Morten Rasmussen of ARM is the developer working on a power-aware scheduler and previously he voiced his thoughts about the design at the end of May. Now as of Tuesday, "RFC" patches have been published to implement such a scheduler for power efficiency.

Rasmussen describes it on the kernel mailing list as:
The patch set introduces a cpu capacity managing 'power scheduler' which lives by the side of the existing (process) scheduler. Its role is to monitor the system load and decide which cpus that should be available to the process scheduler. Long term the power scheduler is intended to replace the currently distributed uncoordinated power management policies and will interface a unified platform specific power driver obtain power topology information and handle idle and P-states. The power driver interface should be made flexible enough to support multiple platforms including Intel and ARM.

This prototype supports very simple task packing and adds cpufreq wrapper governor that allows the power scheduler to drive P-state selection. The prototype policy is absolutely untuned, but this will be addressed in the future. Scalability improvements, such as avoid iterating over all cpus, will also be addressed in the future.

This work in its current form just comes down to a little over 500 lines of new code. There's still more work ahead before the scheduler is in a good state and a candidate for merging, but with the backing of ARM, hopefully it will come to fruition soon enough.

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 .
Latest Linux Hardware Reviews
  1. AMD Launches New FX CPUs, Cuts Prices On Existing Processors
  2. Preview: AMD's FX-9590 Eight-Core At Up To 5.0GHz On Linux
  3. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  4. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
Latest Linux Articles
  1. LLVM Clang 3.5 Brings Some Compiler Performance Improvements
  2. Ondemand vs. Performance CPU Governing For AMD FX CPUs On Linux 3.17
  3. How Intel Graphics On Linux Compare To Open-Source AMD/NVIDIA Drivers
  4. The Fastest NVIDIA GPUs For Open-Source Nouveau With Steam Linux Gaming
Latest Linux News
  1. New Group Calls For Boycotting Systemd
  2. The Features To Find With The Imminent Release Of LLVM/Clang 3.5
  3. Borderlands 2 Is Coming To Linux
  4. The Witcher 2 Ups The Performance More & Works Around Catalyst Bug
  5. Running Gallium3D's LLVMpipe On The Eight-Core 5GHz CPU
  6. Trying Intel OpenCL On Linux For Video Encoding
  7. GSoC 2014 Yielded Some Improvements For Mesa/X.Org This Year
  8. webOS Lives On As LuneOS With New Release
  9. Marek Lands Radeon Gallium3D HyperZ Improvements
  10. Mozilla Firefox 32 Surfaces With HTML5, Developer Changes
Latest Forum Discussions
  1. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  2. nv and xorg.conf under Debian PPC
  3. AMD graphics doesn't work with AMD Catalyst drivers
  4. Best Radeon for a Power Mac G5?
  5. The dangers of Linux kernel development
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. AMD Releases UVD Video Decode Support For R600 GPUs
  8. SSD seems slow