linux-kernel - Re: [PATCH] cgroups: handle failure of cgroup_populate

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Message-Id: <20090522173421.ecacb40e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 22 May 2009 17:34:21 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	libcg-devel@...ts.sourceforge.net, dhaval@...ux.vnet.ibm.com
Subject: Re: [PATCH] cgroups: handle failure of cgroup_populate_dir() at
 mount/remount

On Fri, 22 May 2009 16:35:14 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > On Fri, 22 May 2009 11:00:12 +0800
> > Li Zefan <lizf@...fujitsu.com> wrote:
> > 
> >> Now we have 'stat' file in both memory and cpuacct subsystems. If we
> >> mount these 2 subsystems with option 'noprefix', the creation of 'stat'
> >> file for cpuacct will fail, but without any notificatin to the user.
> >>
> >> With this patch, we fail the mount/remount in this case.
> >>
> > 
> > Hm, shouldn't we allow "noprefix" to be effective only agaisnt cpuset ?
> > I think it's just for backward-compatibility of cpuset.
> > (I don't like the option at all.)
> > 
> 
> Yes, this mount option was introduced for cpuset. But it has been here for
> a long time and people may use it when mounting other cgroup subsystems,
> then is it OK to change to restrict its use within cpuset only?

Asking libcgroup people may be appropriate...added CC.

Thanks,
-Kame

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