linux-kernel - Re: [-mm patch] Show memcg information during OOM (v3)

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Date:	Wed, 4 Feb 2009 15:52:03 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	balbir@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [-mm patch] Show memcg information during OOM (v3)

On Wed, 04 Feb 2009 14:48:58 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> >> BTW, I wonder can't we show the path of mount point ?
> >> /group_A/01 is /cgroup/group_A/01 and /group_A/ is /cgroup/group_A/ on this system.
> >> Very difficult ?
> >>
> > 
> > No, it is not very difficult, we just need to append the mount point.
> > The reason for not doing it is consistency with output of
> > /proc/<pid>/cgroup and other places where cgroup_path prints the path
> > relative to the mount point. Since we are talking about memory, the
> > administrator should know where it is mounted. Do you strongly feel
> > the need to add mount point? My concern is consistency with other
> > cgroup output (look at /proc/sched_debug) for example.
> > 
> 
> Another reason to not do so is, we can mount a specific hierarchy to
> multiple mount points.
> 	# mount -t cgroup -o memory /mnt
> 	# mount -t cgroup -o memory /cgroup
> 	# mkdir /mnt/0
> Now, /mnt/0 is the same with /cgroup/0.
> 
Thank you for clarification. Current logic seems right.

Thanks.
-Kame

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