Scheduler Improvements Published For The Linux 4.6 Kernel
Written by Michael Larabel in Linux Kernel on 14 March 2016 at 09:00 AM EDT. 16 Comments
LINUX KERNEL --
Ingo Molnar is once again very punctual with sending his pull requests in right away for the next Linux kernel merge window for the numerous areas he oversees as the maintainer. One of his interesting pull requests this morning is of the scheduler updates.

The scheduler updates for Linux 4.6 introduce the concept of simple waitqueues (swait), NUMA scheduling enhancements, NOHZ performance enhancements, and deadline scheduler enhancements.

Simple waitqueues are "pure waitqueues without any of the more complex features of full-blown waitqueues" while the benefit is less memory overhead and faster performance. With Linux 4.6, swaits are being used in the RCU code and KVM vCPU wake-ups.

One of the NUMA scheduling improvements worth mentioning is this patch for more fairly distributing memory between nodes for resulting in more memory bandwith for each instance and thus greater performance. Details on other scheduler updates for the Linux 4.6 kernel can be found via this pull request.
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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 10,000 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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