Re: [PATCH] sched: Fix numabalancing to work with isolated cpus

From	Michal Hocko <mhocko@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] sched: Fix numabalancing to work with isolated cpus
Date	2017-04-06 12:50 +0200
Message-ID	<ttd9g-7m3-13@gated-at.bofh.it> (permalink)
References	(4 earlier) <tta1H-5sD-13@gated-at.bofh.it> <ttabn-5wO-17@gated-at.bofh.it> <ttbTQ-6GC-39@gated-at.bofh.it> <ttcGe-7cD-11@gated-at.bofh.it> <ttcZA-7iO-23@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu 06-04-17 12:29:57, Peter Zijlstra wrote:
> On Thu, Apr 06, 2017 at 12:13:49PM +0200, Michal Hocko wrote:
> > On Thu 06-04-17 11:23:29, Peter Zijlstra wrote:
> > > On Thu, Apr 06, 2017 at 09:34:36AM +0200, Michal Hocko wrote:
> > [...]
> > > > I would really like to see it confirmed by the scheduler maintainers and
> > > > documented properly as well. What you are claiming here is rather
> > > > surprising to my understanding of what isolcpus acutally is.
> > > 
> > > isolcpus gets you a set of fully partitioned CPUs. What's surprising
> > > about that?
> > 
> > Well, I thought that all isolated cpus simply form their own scheduling
> > domain which is isolated from the general workload on the system
> > (kthreads, softirqs etc...).
> 
> No, they all form their own 1 cpu partition.

Is this something dictated by usecases which rely on isolcpus or rather
nobody bothered to implement one scheduling domain?

-- 
Michal Hocko
SUSE Labs

Thread

[PATCH] sched: Fix numabalancing to work with isolated cpus Srikar Dronamraju <srikar@linux.vnet.ibm.com> - 2017-04-04 19:30 +0200
  Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Rik van Riel <riel@redhat.com> - 2017-04-04 21:00 +0200
  Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Mel Gorman <mgorman@techsingularity.net> - 2017-04-04 22:40 +0200
    Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Srikar Dronamraju <srikar@linux.vnet.ibm.com> - 2017-04-05 04:00 +0200
      Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Mel Gorman <mgorman@techsingularity.net> - 2017-04-05 10:10 +0200
  Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Michal Hocko <mhocko@kernel.org> - 2017-04-05 15:00 +0200
    Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Srikar Dronamraju <srikar@linux.vnet.ibm.com> - 2017-04-05 17:30 +0200
      Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Michal Hocko <mhocko@kernel.org> - 2017-04-05 18:50 +0200
        Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Srikar Dronamraju <srikar@linux.vnet.ibm.com> - 2017-04-06 09:30 +0200
          Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Michal Hocko <mhocko@kernel.org> - 2017-04-06 09:40 +0200
            Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Peter Zijlstra <peterz@infradead.org> - 2017-04-06 11:30 +0200
              Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Michal Hocko <mhocko@kernel.org> - 2017-04-06 12:20 +0200
                Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Peter Zijlstra <peterz@infradead.org> - 2017-04-06 12:40 +0200
                Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Michal Hocko <mhocko@kernel.org> - 2017-04-06 12:50 +0200
                Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Peter Zijlstra <peterz@infradead.org> - 2017-04-06 12:50 +0200
                Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Michal Hocko <mhocko@kernel.org> - 2017-04-06 15:50 +0200
  Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Peter Zijlstra <peterz@infradead.org> - 2017-04-06 09:40 +0200
  Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Mike Galbraith <efault@gmx.de> - 2017-04-06 09:40 +0200

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