linux-kernel - Re: [PATCH v2] memcg: first step towards hierarchical controller

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Date:	Tue, 4 Sep 2012 18:54:08 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	<linux-mm@...ck.org>, Dave Jones <davej@...hat.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Turner <pjt@...gle.com>,
	Lennart Poettering <lennart@...ttering.net>,
	Kay Sievers <kay.sievers@...y.org>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH v2] memcg: first step towards hierarchical controller


>> I believe it would be really great to have a way to turn the default
>> to 1 - and stop the shouting.
> 
> We already can. You can use /etc/cgconfig (if you are using libcgroup)
> or do it manually.
> 
>> Even if you are doing it in OpenSUSE as a patch, an upstream patch means
>> at least that every distribution is using the same patch, and those who
>> rebase will just flip the config.
>>
>> I'd personally believe merging both our patches together would achieve a
>> good result.
> 
> I am still not sure we want to add a config option for something that is
> meant to go away. But let's see what others think.
> 

So what you propose in the end is that we add a userspace tweak for
something that could go away, instead of a Kconfig for something that go
away.

Way I see it, Kconfig is better because it is totally transparent, under
the hood, and will give us a single location to unpatch in case/when it
really goes away.


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