Linux 4.18 Scheduler Updates Benefit Schedutil, NUMA, vCPUs

Written by Michael Larabel in Linux Kernel on 4 June 2018 at 02:50 PM EDT. Add A Comment
The scheduler updates submitted today for the Linux 4.18 kernel merge window include a few notable changes.

This pull does contain the previously-covered scheduler optimization for virtual CPUs. That change is about not scheduling threads on pre-empted vCPUs and in some synthetic scheduler benchmarks yielded a change by as much as 8~25%.

There are also power-aware scheduling improvements with this pull by taking account more information about the current state when making use of Schedutil for scheduler utilization data.

Also rounding things out are more NUMA balancing improvements. The list of Linux 4.18 scheduler changes via this pull request.
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Michael Larabel

Michael Larabel is the principal author of 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 automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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