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 Benchmarking Platform
Phoromatic Test Orchestration

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 News
  1. KDE Applications 15.04.3 Fixes Bugs
  2. Benchmarks Of 54 Different Intel/AMD Linux Systems
  3. Linux 4.2 Bringing Support For ARCv2, HS38 CPU Cores
  4. Libdrm 2.4.62 Is An Important Update For Open-Source GPU Drivers
  5. The State of Unity 3D Game Engine, Editor On Linux
  6. ZFS On Linux 0.6.4.2 Brings Linux 4.1 Support, Fixes
  7. Old Net Burst Tests, Ubuntu Phone & Assembly x86 Were Popular Topics Last Month
  8. Qt 5.5 Officially Released
  9. Global Shortcuts In KDE Plasma Under Wayland
  10. LLVMpipe FP64 Support Knocks Off Some GL4 Extensions
Latest Articles & Reviews
  1. How KDE VDG Is Trying To Make Open-Source Software Beautiful
  2. Attempting To Try Out BCache On The Linux 4.1 Kernel
  3. CompuLab's Fitlet Is A Very Tiny, Fanless, Linux PC With AMD A10 Micro
  4. AMD A10-7870K Godavari: RadeonSI Gallium3D vs. Catalyst Linux Drivers
Most Viewed News This Week
  1. Kubuntu 15.10 Could Be The End Of The Road
  2. NVIDIA Starts Supplying Open-Source Hardware Reference Headers
  3. KDBUS Won't Be Pushed Until The Linux 4.3 Kernel
  4. The State & Complications Of Porting The Unity Editor To Linux
  5. The Staging Pull For Linux 4.2: "Big, Really Big"
  6. Latest Rumor Pegs Microsoft Wanting To Buy AMD
  7. SteamOS "Brewmaster" Is Valve's New Debian 8.1 Based Version
  8. Jonathan Riddell Steps Down From The Kubuntu Council