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 Articles & Reviews
  1. Ubuntu vs. Fedora Linux On Lenovo's X1 Carbon With Core i7 Broadwell
  2. Ubuntu 15.04 Is The Easy Path To Better Performance On Intel Broadwell
  3. NVIDIA's Latest Maxwell Line-Up Against AMD With Catalyst On Linux
  4. Preliminary Tests Of Intel Sandy Bridge & Ivy Bridge vs. Broadwell
  5. AMD FX-8320E Performance On Linux
  6. Linux Compiler Benchmarks Of LLVM Clang 3.5 vs. LLVM Clang 3.6-rc1
Latest Linux News
  1. Libinput 0.9 Adds Support For Hovering Fingers On Touchpads
  2. Free Software Foundation Endorses Another (Outdated) Laptop
  3. DNF Plugins Extend The Functionality Of Fedora's Yum Successor
  4. LibreOffice 4.4 Released With Better OOXML Support, UI Improvements
  5. Inkscape 0.91 Goes Through C++ Code Conversion, New Cairo Rendering, OpenMP Filters
  6. New Mesa Patch To Improve CPU-Bound Applications
  7. LLVM Adds Options To Do Fuzz Testing
  8. Coreboot Now Supports Another Dual-Socket AMD Motherboard
  9. Atomic Mode-Setting/Display Support Progresses In Linux 3.20
  10. NVIDIA 340.76 Brings Three Stable Fixes
Most Viewed News This Week
  1. PlayStation 4 System Compiler Support Landing In LLVM
  2. LibreOffice 4.4 Is Coming Soon With New Features
  3. Linux "GHOST" Vulnerability Hits Glibc Systems
  4. My Initial Intel Broadwell Linux Experience With The ThinkPad X1 Carbon
  5. Broadwell Linux Ultrabook Running MUCH Cooler Than Haswell
  6. LZHAM 1.0 Lossless Data Compression Codec Released
  7. Linux Users Upset By Chromium's Busted HiDPI Support
  8. Faster VP9 Decoding Is On The Horizon