linux-kernel - Re: [PATCH v3 05/28] memcg: Reclaim when more than one page needed.

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Date:	Tue, 29 May 2012 19:45:42 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	<linux-mm@...ck.org>, <kamezawa.hiroyu@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	Greg Thelen <gthelen@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>, <devel@...nvz.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3 05/28] memcg: Reclaim when more than one page needed.

On 05/29/2012 06:20 PM, Christoph Lameter wrote:
> On Tue, 29 May 2012, Christoph Lameter wrote:
>
>>>   	* unlikely to succeed so close to the limit, and we fall back
>>>   	 * to regular pages anyway in case of failure.
>>>   	 */
>>> -	if (nr_pages == 1&&  ret)
>>> +	if (nr_pages<= (PAGE_SIZE<<  PAGE_ALLOC_COSTLY_ORDER)&&  ret) {
>
> Should this not be
>
> 	 nr_pages<= 1<<  PAGE_ALLOC_COSTLY_ORDER

I myself believe you are right.

Not sure if Suleiman had anything in mind that we're not seeing when he 
wrote this code?

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