linux-kernel - Re: [PATCH 3/12] memcg make root cgroup unlimited.

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Message-Id: <20080926182122.c7c88a65.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 26 Sep 2008 18:21:22 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Hansen <haveblue@...ibm.com>, ryov@...inux.co.jp
Subject: Re: [PATCH 3/12] memcg make root cgroup unlimited.

On Fri, 26 Sep 2008 14:11:00 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > Make root cgroup of memory resource controller to have no limit.
> > 
> > By this, users cannot set limit to root group. This is for making root cgroup
> > as a kind of trash-can.
> > 
> > For accounting pages which has no owner, which are created by force_empty,
> > we need some cgroup with no_limit. A patch for rewriting force_empty will
> > will follow this one.
> > 
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> This is an ABI change (although not too many people might be using it, I wonder
> if we should add memory.features (a set of flags and let users enable them and
> provide good defaults), like sched features.
> 
I think "feature" flag is complicated, at this stage.
We'll add more features and not settled yet.

Hmm, if you don't like this,
calling try_to_free_page() at force_empty() instead of move_account() ?


Thanks,
-Kame

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