Message-ID: <4FC4EF26.30609@parallels.com>
Date: Tue, 29 May 2012 19:45:42 +0400
From: Glauber Costa <glommer@parallels.com>
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To: Christoph Lameter <cl@linux.com>
CC: <linux-kernel@vger.kernel.org>, <cgroups@vger.kernel.org>,
        <linux-mm@kvack.org>, <kamezawa.hiroyu@jp.fujitsu.com>,
        Tejun Heo <tj@kernel.org>, Li Zefan <lizefan@huawei.com>,
        Greg Thelen <gthelen@google.com>,
        Suleiman Souhlal <suleiman@google.com>, Michal Hocko <mhocko@suse.cz>,
        Johannes Weiner <hannes@cmpxchg.org>, <devel@openvz.org>,
        David Rientjes <rientjes@google.com>
Subject: Re: [PATCH v3 05/28] memcg: Reclaim when more than one page needed.
References: <1337951028-3427-1-git-send-email-glommer@parallels.com> <1337951028-3427-6-git-send-email-glommer@parallels.com> <alpine.DEB.2.00.1205290917230.4666@router.home> <alpine.DEB.2.00.1205290919130.4666@router.home>
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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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