linux-kernel - Re: [PATCH] mm: vmscan: fix setting reclaim mode

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Message-ID: <20120110094452.GC4118@suse.de>
Date:	Tue, 10 Jan 2012 09:44:52 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Hillf Danton <dhillf@...il.com>
Cc:	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: vmscan: fix setting reclaim mode

On Sun, Jan 08, 2012 at 03:05:03PM +0800, Hillf Danton wrote:
> The check for under memory pressure is corrected, then lumpy reclaim or
> reclaim/compaction could be avoided either when for order-O reclaim or
> when free pages are already low enough.
> 

No explanation of problem, how this patch fixes it or what the impact
is.

At a glance, this will have the impact of using sync reclaim at low
reclaim priorities. This is unexpected so needs much better explanation.

-- 
Mel Gorman
SUSE Labs
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