From: Michal Hocko <mhocko@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@techsingularity.net>,
Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH] sched: Fix numabalancing to work with isolated cpus
Date: Thu, 6 Apr 2017 12:42:04 +0200 [thread overview]
Message-ID: <20170406104204.GI5497@dhcp22.suse.cz> (raw)
In-Reply-To: <20170406102957.xz53avexxyiim4az@hirez.programming.kicks-ass.net>
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
next prev parent reply other threads:[~2017-04-06 10:42 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-04 17:27 [PATCH] sched: Fix numabalancing to work with isolated cpus Srikar Dronamraju
2017-04-04 18:56 ` Rik van Riel
2017-04-04 20:37 ` Mel Gorman
2017-04-05 1:50 ` Srikar Dronamraju
2017-04-05 8:09 ` Mel Gorman
2017-04-05 12:57 ` Michal Hocko
2017-04-05 15:22 ` Srikar Dronamraju
2017-04-05 16:44 ` Michal Hocko
2017-04-06 7:19 ` Srikar Dronamraju
2017-04-06 7:34 ` Michal Hocko
2017-04-06 9:23 ` Peter Zijlstra
2017-04-06 10:13 ` Michal Hocko
2017-04-06 10:29 ` Peter Zijlstra
2017-04-06 10:42 ` Michal Hocko [this message]
2017-04-06 10:47 ` Peter Zijlstra
2017-04-06 13:44 ` Michal Hocko
2017-04-06 7:36 ` Mike Galbraith
2017-04-06 7:36 ` Peter Zijlstra
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