linux-kernel - Re: [PATCH] fix vmscan to take care of nodemask

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Message-ID: <2f11576a0903230831r72892eadoabfc0f128e9f55a6@mail.gmail.com>
Date:	Tue, 24 Mar 2009 00:31:05 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	riel@...hat.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] fix vmscan to take care of nodemask

2009/3/23 Christoph Lameter <cl@...ux-foundation.org>:
> On Mon, 23 Mar 2009, Mel Gorman wrote:
>
>> try_to_free_pages() is used for the direct reclaim of up to
>> SWAP_CLUSTER_MAX pages when watermarks are low. The caller to
>> alloc_pages_nodemask() can specify a nodemask of nodes that are allowed
>> to be used but this is not passed to try_to_free_pages(). This can lead
>> to the unnecessary reclaim of pages that are unusable by the caller and
>> in the worst case lead to allocation failure as progress was not been
>> made where it is needed.
>>
>> This patch passes the nodemask used for alloc_pages_nodemask() to
>> try_to_free_pages().
>
> This is only useful for MPOL_BIND. Direct reclaim within a cpuset already
> honors the boundaries of the cpuset.

Do you mean nak or comment adding request?
I agree you. but I don't find any weak point of this patch.
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