From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1753458AbdBIPRI (ORCPT <rfc822;w@1wt.eu>);
        Thu, 9 Feb 2017 10:17:08 -0500
Received: from mout.gmx.net ([212.227.15.19]:58813 "EHLO mout.gmx.net"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1752079AbdBIPRF (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 9 Feb 2017 10:17:05 -0500
Message-ID: <1486652935.3787.5.camel@gmx.de>
Subject: Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode
From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>, Paul Turner <pjt@google.com>
Cc: Tejun Heo <tj@kernel.org>, lizefan@huawei.com,
        Johannes Weiner <hannes@cmpxchg.org>, Ingo Molnar <mingo@redhat.com>,
        Andy Lutomirski <luto@amacapital.net>,
        cgroups <cgroups@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        kernel-team <kernel-team@fb.com>, lvenanci@redhat.com,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 09 Feb 2017 16:08:55 +0100
In-Reply-To: <20170209144704.GD6515@twins.programming.kicks-ass.net>
References: <20170202200632.13992-1-tj@kernel.org>
         <CAPM31RKHsM1-iWb5B6jkOtLomLhiOARtgMOTWZ8p1yjEn-ZK0A@mail.gmail.com>
         <20170209144704.GD6515@twins.programming.kicks-ass.net>
Content-Type: text/plain; charset="us-ascii"
X-Mailer: Evolution 3.16.5 
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Provags-ID: V03:K0:3oIDBRJGrbTLRJUJ6xqIXSmkPLSoaUCqAcFgyQhb8DVHO/DgMN3
 IE9BPFc8fAPDTIt9DgRPCxG0HuVO/5uFnvvDvGdf+cfBM9eD3fMksuH0A8NcKFySGC45bJE
 kC2BuhNUOHFSx6TTczcngPNmIv9PyIDmbg9R0WiyIHMHEDUWItVz+rMN38nLkFJ+/GtS6ea
 cr0m6qZ53LrLmuAb6P21Q==
X-UI-Out-Filterresults: notjunk:1;V01:K0:/ujy8lK02/U=:IzdM1Q4EbTdN3Y65xcTeZI
 pL2zQUl8VA8FX/a15In1zYHJWG+Br90ythw3OOf8LR93aa61IxY8YrtuJ8E6VBETw3uf2Iah/
 QmUp17OwJe//Q480Z10YaF89yrkV+xw3BH3RA6pPW0i5POLv5KqQ4HpLQylql5Ssv3kw4jH+8
 B2Zl7nxmpjNGAhYeFdOvJjOu2+inkBI/6NQfPkvjY8ynRXcUQIrIDN96pxFGGt/mi8qdPRZHT
 dbC6rFZoT/gIPEK9smODj4/nYiBR595wUBzUtItSbTc+RiLZbdN6dPqSeEfqsgQYoGUHtH7cy
 +kD3bUAHkehGPuwyhx5F4zOXkCuys4hJEDCK3MmsTEpyHuBye2M+8Jp6KCzpkCctpRlyoaz6r
 i2BNYz0uSt2aML2ywluOri3J3Zhf/BcWWYDWM6JJ8KV6Cgr2laZQ+eVqM6AbvQkEkuRx4/1C0
 fJSwZHPuij7uMkra/8n44k4qzb8eUVI4aE0y6/RwfOqxZq0x0RDTu+8Y9OXOSsk2lcTaKezZZ
 cvoVgckZM+89o2mVGR1II1WpayxGzcFB/bePSJuXqpt4FKafeZje0d8hIu8S2iTKN68NfGBc1
 aIsblc/ZcFxMVvIQPhS09WeTlSQ92gcBNlP6Mp06aoxld+6YLNCP9v6SPBF+HjELl85V06dWv
 rpwt7mBHxz2fmx/6lHQbxQC1YFZB6VZxFGIy2ym2T7VmHi5cO2RDLuH84paAmFDUq6lWPzDHS
 jbQYS1Kno5XomSy/OF8WUWE0OJwEnWrh78XqfThH9XDLtg4N5QlX8iVnvpTE824ngnzYAwHwG
 Z+5OFr2
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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