linux-kernel - Re: [PATCH 1/3] mm: vmscan: Remove lumpy reclaim

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Message-ID: <4F85BE78.8040205@redhat.com>
Date:	Wed, 11 Apr 2012 13:25:12 -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 1/3] mm: vmscan: Remove lumpy reclaim

On 04/11/2012 12:38 PM, Mel Gorman wrote:
> Lumpy reclaim had a purpose but in the mind of some, it was to kick
> the system so hard it trashed. For others the purpose was to complicate
> vmscan.c. Over time it was giving softer shoes and a nicer attitude but
> memory compaction needs to step up and replace it so this patch sends
> lumpy reclaim to the farm.
>
> The tracepoint format changes for isolating LRU pages with this patch
> applied. Furthermore reclaim/compaction can no longer queue dirty pages in
> pageout() if the underlying BDI is congested. Lumpy reclaim used this logic
> and reclaim/compaction was using it in error.
>
> Signed-off-by: Mel Gorman<mgorman@...e.de>

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

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