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Date: Thu, 14 May 2009 15:57:32 -0400 (EDT)
From: Christoph Lameter <cl@linux-foundation.org>
X-X-Sender: cl@qirst.com
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
cc: LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 2/4] vmscan: drop PF_SWAPWRITE from zone_reclaim
In-Reply-To: <20090513120627.587F.A69D9226@jp.fujitsu.com>
Message-ID: <alpine.DEB.1.10.0905141553160.1381@qirst.com>
References: <20090513120155.5879.A69D9226@jp.fujitsu.com> <20090513120627.587F.A69D9226@jp.fujitsu.com>
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On Wed, 13 May 2009, KOSAKI Motohiro wrote:

> Subject: [PATCH] vmscan: drop PF_SWAPWRITE from zone_reclaim
>
> PF_SWAPWRITE mean ignore write congestion. (see may_write_to_queue())
>
> foreground reclaim shouldn't ignore it because to write congested device cause
> large IO lantency.
> it isn't better than remote node allocation.

Zone reclaim by default does not perform writes. RECLAIM_WRITE must be set
for that to be effective.

Acked-by: Christoph Lameter <cl@linux-foundation.org>