linux-kernel - Re: [PATCH 2/4] vmscan: drop PF_SWAPWRITE from zone

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Message-ID: <alpine.DEB.1.10.0905141553160.1381@qirst.com>
Date:	Thu, 14 May 2009 15:57:32 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/4] vmscan: drop PF_SWAPWRITE from zone_reclaim

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@...ux-foundation.org>


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