linux-kernel - Re: [mm] [PATCH 4/4] Memory cgroup hierarchy feature selector

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Date:	Thu, 6 Nov 2008 16:30:21 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	linux-mm@...ck.org, YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [mm] [PATCH 4/4] Memory cgroup hierarchy feature selector

On Thu, 06 Nov 2008 12:26:29 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > On Sun, 02 Nov 2008 11:33:51 +0530
> > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > 
> >> KAMEZAWA Hiroyuki wrote:
> >>> On Sun, 02 Nov 2008 00:19:02 +0530
> >>> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> >>>
> >>>> Don't enable multiple hierarchy support by default. This patch introduces
> >>>> a features element that can be set to enable the nested depth hierarchy
> >>>> feature. This feature can only be enabled when there is just one cgroup
> >>>> (the root cgroup).
> >>>>
> >>> Why the flag is for the whole system ?
> >>> flag-per-subtree is of no use ?
> >> Flag per subtree might not be useful, since we charge all the way up to root,
> > Ah, what I said is "How about enabling/disabling hierarhcy support per subtree ?"
> > Sorry for bad text.
> > 
> > like this.
> >   - you can set hierarchy mode of a cgroup turned on/off when...
> >     * you don't have any tasks under it && it doesn't have any child cgroup.
> 
> I see.. the presence of tasks don't matter, since the root cgroup will always
> have tasks. Presence of child groups does matter.
> 
yes. you're right.

Thanks,
-Kame

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