linux-kernel - Re: [PATCH 2/3] mm: vmscan: Do not stall on writeback during memory compaction

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Message-ID: <4F85BEB5.6080702@redhat.com>
Date:	Wed, 11 Apr 2012 13:26:13 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Hugh Dickins <hughd@...gle.com>, Ying Han <yinghan@...gle.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mm: vmscan: Do not stall on writeback during memory
 compaction

On 04/11/2012 12:38 PM, Mel Gorman wrote:
> This patch stops reclaim/compaction entering sync reclaim as this was only
> intended for lumpy reclaim and an oversight. Page migration has its own
> logic for stalling on writeback pages if necessary and memory compaction
> is already using it.
>
> Waiting on page writeback is bad for a number of reasons but the primary
> one is that waiting on writeback to a slow device like USB can take a
> considerable length of time. Page reclaim instead uses wait_iff_congested()
> to throttle if too many dirty pages are being scanned.
>
> Signed-off-by: Mel Gorman<mgorman@...e.de>

Acked-by: Rik van Riel <riel@...hat.com>

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