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

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Message-ID: <48DCAB8C.5030405@linux.vnet.ibm.com>
Date:	Fri, 26 Sep 2008 14:59:48 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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.

KAMEZAWA Hiroyuki wrote:
> 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.
> 

I know.. but breaking ABI is a bad bad thing. We'll have to keep the feature
flags extensible (add new things). If we all feel we don't have enough users
affected by this change, I might agree with you and make that change.

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

Not sure I understand this.


-- 
	Balbir
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