linux-kernel - Re: [RFC] cgroup TODOs

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Message-ID: <20120919140203.GA5398@dhcp22.suse.cz>
Date:	Wed, 19 Sep 2012 16:02:03 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	Glauber Costa <glommer@...allels.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Turner <pjt@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Graf <tgraf@...g.ch>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Neil Horman <nhorman@...driver.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Dave Jones <davej@...hat.com>,
	Ben Hutchings <ben@...adent.org.uk>
Subject: Re: [RFC] cgroup TODOs

[CCing Dave, Ben]

Just a short summary as you were not on the CC list. This is sort of
follow up on https://lkml.org/lkml/2012/9/3/211. The end result is
slightly different because Tejun did a more generic cgroup solution (see
bellow). I cannot do the same for OpenSUSE so I will stick with the
memcg specific patch.

On Fri 14-09-12 17:03:06, Michal Hocko wrote:
> I am currently planning to add a warning to most of the currenly
> maintained distributions to have as big coverage as possible. No default
> switch for obvious reasons but hopefuly we will get some feedback at
> least.

Just for the record, I will post backports of the patch I ended up using
for openSUSE 11.4 and 12.[12] and SLES-SP2 as a reply to this email (and
2.6.32 in case somebody is interested).

I hope other distributions can either go with this (which will never be
merged but it should help to identify dubious usage of flat hierarchies
without a risk of breaking anythign) or what Tejun has in his tree[1]
8c7f6edb (cgroup: mark subsystems with broken hierarchy support and
whine if cgroups are nested for them) which is more generic but it is
also slightly more intrusive.

---
[1] - git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-3.7-hierarchy
-- 
Michal Hocko
SUSE Labs
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