linux-kernel - Re: [RFC][PATCH 0/2] Android style loosening of cgroup attach permissions

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Message-ID: <20150604183658.GA5682@cmpxchg.org>
Date:	Thu, 4 Jun 2015 14:36:58 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Tejun Heo <tj@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	Li Zefan <lizefan@...wei.com>,
	Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
	Android Kernel Team <kernel-team@...roid.com>,
	Rom Lemarchand <romlem@...roid.com>,
	Colin Cross <ccross@...roid.com>
Subject: Re: [RFC][PATCH 0/2] Android style loosening of cgroup attach
 permissions

On Thu, Jun 04, 2015 at 10:11:17AM -0700, John Stultz wrote:
> On Tue, Jun 2, 2015 at 10:50 PM, Tejun Heo <tj@...nel.org> wrote:
> > memcg usage came up a while ago and there wasn't anything major which
> > can't be achieved (usually better) by following more standard cgroup
> > usage - changing knobs rather than moving tasks around.
> 
> Do you have a pointer to that discussion or maybe even just a sense of
> who was involved so I can trawl the list and better understand it?

I wrote a lengthy explanation of why moving tasks between cgroups is
problematic from a memcg view: https://lkml.org/lkml/2014/12/19/358

Rather than creating super-cgroups as configuration domains and using
migration as a reconfiguration mechanism, it's much better to group
tasks per app and reconfigure the groups themselves using specific
presets for classes of apps, like foreground, background, audio.
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