linux-kernel - Re: [PATCH REPOST RFC cgroup/for-3.7] cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them

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Message-ID: <505181A2.1040004@huawei.com>
Date:	Thu, 13 Sep 2012 14:48:02 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Glauber Costa <glommer@...allels.com>,
	<linux-kernel@...r.kernel.org>,
	<containers@...ts.linux-foundation.org>, <cgroups@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>,
	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>,
	Vivek Goyal <vgoyal@...hat.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>
Subject: Re: [PATCH REPOST RFC cgroup/for-3.7] cgroup: mark subsystems with
 broken hierarchy support and whine if cgroups are nested for them

On 2012/9/13 0:34, Tejun Heo wrote:
> Hello,
> 
> On Wed, Sep 12, 2012 at 01:37:28PM +0400, Glauber Costa wrote:
>> "If a cpuset is cpu or mem exclusive, no other cpuset, other than
>> a direct ancestor or descendant, may share any of the same CPUs or
>> Memory Nodes."
>>
>> So I think it tricked me as well. I was under the impression that
>> "exclusive" would also disallow the kids.
> 
> You two are confusing me even more.  AFAICS, the hierarchical
> properties don't seem to change whether exclusive is set or not.  It
> still ensures children can't have something parent doesn't allow and
> exclusive applies to whether to share something with siblings, so I
> don't think anything is broken hierarchy-wise.  Am I missing
> something?  If so, please be explicit and elaborate where and how it's
> broken.
> 

Ignore it. I misunderstood the exclusive flag. Sorry for the noise.

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