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: <20120913175216.GB7677@google.com>
Date:	Thu, 13 Sep 2012 10:52:16 -0700
From:	Tejun Heo <tj@...nel.org>
To:	"Daniel P. Berrange" <berrange@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Neil Horman <nhorman@...driver.com>,
	Michal Hocko <mhocko@...e.cz>,
	Paul Mackerras <paulus@...ba.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Graf <tgraf@...g.ch>,
	"Serge E. Hallyn" <serue@...ibm.com>, Paul Turner <pjt@...gle.com>,
	Ingo Molnar <mingo@...hat.com>, Vivek Goyal <vgoyal@...hat.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

Hello, Daniel.

On Thu, Sep 13, 2012 at 01:16:29PM +0100, Daniel P. Berrange wrote:
> If you want application developers / users to understand this, then
> you really need to update the Documentation/cgroups/cgroups.txt file
> to provide suitable recommendations on use of hierarchies. As it
> stands today it arguably encourages apps to make use of arbitrary
> hierarchies. While some of the other docs (blkio-controller.txt) do
> describe the limitations of their implementation, they don't ever
> go as far as recommending against usage of hierarchies, which is
> what you seem to be saying.
>
> Just printing warning messages in the logs with no docs to explain
> the issues which cause the warnings is not friendly to users, and
> IMHO will just lead people to ignore the warnings.

Oh yeah, we definitely need to update the docs.  No doubt about it.
Will do.

Thanks.

-- 
tejun
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