What's Been Going On With CPUFreq & The Scheduler
Written by Michael Larabel in Linux Kernel on 23 August 2016 at 09:05 AM EDT. 23 Comments
LINUX KERNEL --
As we've been covering the past few kernel cycles, a lot of low-level improvements have been happening to CPUFreq with going through a redesign and more plus the introduction of a new CPUFreq governor. If you're behind on this subject matter, here's some slides from this week's LinuxCon event that covers the changes.

Rafael J. Wysocki, the ACPI/PM subsystem maintainer for the Linux kernel, is once again presenting at LinuxCon. For LinuxCon NA 2016 he's talking about these CPUFreq changes that have been going on.

In case you missed it, the CPUFreq scheduler is now scheduler-driven since Linux 4.6 via callbacks and no longer relies upon timers. With Linux 4.7 was the new schedutil governor that makes use of scheduler data for making CPU frequency selection / power state decisions. These low-level changes though are really just the beginning with more improvements expected -- including making greater use of integration with the scheduler -- in future kernel updates.

You can see Rafael's PDF slides for those not in Toronto for LinuxCon.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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