linux-kernel - Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode

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Date:   Thu, 09 Feb 2017 16:08:55 +0100
From:   Mike Galbraith <efault@....de>
To:     Peter Zijlstra <peterz@...radead.org>, Paul Turner <pjt@...gle.com>
Cc:     Tejun Heo <tj@...nel.org>, lizefan@...wei.com,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...com>, lvenanci@...hat.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode

On Thu, 2017-02-09 at 15:47 +0100, Peter Zijlstra wrote:
> On Thu, Feb 09, 2017 at 05:07:16AM -0800, Paul Turner wrote:
> > The only case that this does not support vs ".threads" would be some
> > hybrid where we co-mingle threads from different processes (with the
> > processes belonging to the same node in the hierarchy).  I'm not aware
> > of any usage that looks like this.
> 
> If I understand you right; this is a fairly common thing with RT where
> we would stuff all the !rt threads of the various processes in a 'misc'
> bucket.
> 
> Similarly, it happens that we stuff the various rt threads of processes
> in a specific (shared) 'rt' bucket.
> 
> So I would certainly not like to exclude that setup.

Absolutely, you just described my daily bread performance setup.

	-Mike