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

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Message-ID: <20170209144704.GD6515@twins.programming.kicks-ass.net>
Date:   Thu, 9 Feb 2017 15:47:04 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     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>,
        Mike Galbraith <efault@....de>,
        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, 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.