linux-kernel - Re: [PATCH 6/6] vmscan: Kick flusher threads to clean pages when reclaim is encountering dirty pages

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Date:	Mon, 2 Aug 2010 10:30:08 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Sean Jensen-Grey <seanj@...e.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>, pvz@....pp.se,
	bgamari@...il.com, larppaxyz@...il.com, seanj@...e.com,
	kernel-bugs.dev1world@...mgourmet.com, akatopaz@...il.com,
	frankrq2009@....com, thomas.pi@...or.de, spawels13@...il.com,
	vshader@...il.com, rockorequin@...mail.com, ylalym@...il.com,
	theholyettlz@...glemail.com, hassium@...dex.ru
Subject: Re: [PATCH 6/6] vmscan: Kick flusher threads to clean pages when
 reclaim is encountering dirty pages

Hi Sean,

On Mon, Aug 02, 2010 at 10:17:27AM +0800, Sean Jensen-Grey wrote:
> Wu,
> 
> Thank you for doing this. This still bites me on a weekly basis. I don't have much time to test the patches this week, but I should get access to an identical box week after next.

That's OK.

> BTW, I experience the issues even with 8-10GB of free ram. I have 12GB currently.

Thanks for the important information. It means the patches proposed
are not likely to help your case.

In Comment #47 for bug 12309, your kernel 2.6.27 is too old though.  You may
well benefit from Jens' CFQ low latency improvements if switching to a recent
kernel.

Thanks,
Fengguang
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