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Re: [RFC 3/3] sched/topology: Different sched groups must not have the same balance cpu

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [RFC 3/3] sched/topology: Different sched groups must not have the same balance cpu
Date 2017-04-14 18:50 +0200
Message-ID <twcA2-3pr-17@gated-at.bofh.it> (permalink)
References <tvNrX-3KR-5@gated-at.bofh.it> <tvNrY-3KR-29@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Apr 13, 2017 at 10:56:09AM -0300, Lauro Ramos Venancio wrote:
> Currently, the group balance cpu is the groups's first CPU. But with
> overlapping groups, two different groups can have the same first CPU.
> 
> This patch uses the group mask to mark all the CPUs that have a
> particular group as its main sched group. The group balance cpu is the
> first group CPU that is also in the mask.

Please give a NUMA configuration and CPU number where this goes wrong.

Because only the first group of a domain matters, and with the other
thing fixed, I'm not immediately seeing where we go wobbly.

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Thread

[RFC 0/3] sched/topology: fix sched groups on NUMA machines with mesh topology Lauro Ramos Venancio <lvenanci@redhat.com> - 2017-04-13 16:00 +0200
  [RFC 1/3] sched/topology: Refactor function build_overlap_sched_groups() Lauro Ramos Venancio <lvenanci@redhat.com> - 2017-04-13 16:00 +0200
    Re: [RFC 1/3] sched/topology: Refactor function  build_overlap_sched_groups() Rik van Riel <riel@redhat.com> - 2017-04-13 17:00 +0200
  [RFC 3/3] sched/topology: Different sched groups must not have the same balance cpu Lauro Ramos Venancio <lvenanci@redhat.com> - 2017-04-13 16:00 +0200
    Re: [RFC 3/3] sched/topology: Different sched groups must not have  the same balance cpu Rik van Riel <riel@redhat.com> - 2017-04-13 17:30 +0200
    Re: [RFC 3/3] sched/topology: Different sched groups must not have  the same balance cpu Peter Zijlstra <peterz@infradead.org> - 2017-04-14 18:50 +0200
      Re: [RFC 3/3] sched/topology: Different sched groups must not have  the same balance cpu Lauro Venancio <lvenanci@redhat.com> - 2017-04-17 17:40 +0200
        Re: [RFC 3/3] sched/topology: Different sched groups must not have  the same balance cpu Peter Zijlstra <peterz@infradead.org> - 2017-04-18 14:40 +0200

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