linux-kernel - Re: Why PAGEOUT_IO_SYNC stalls for a long time

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Message-ID: <20100805080953.GA3366@rhlx01.hs-esslingen.de>
Date:	Thu, 5 Aug 2010 10:09:53 +0200
From:	Andreas Mohr <andi@...as.de>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>, Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	Rik van Riel <riel@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	"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>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andreas Mohr <andi@...as.de>, Bill Davidsen <davidsen@....com>,
	Ben Gamari <bgamari.foss@...il.com>
Subject: Re: Why PAGEOUT_IO_SYNC stalls for a long time

On Thu, Aug 05, 2010 at 03:20:44PM +0900, KOSAKI Motohiro wrote:
> Yup, I posted them today. While my lite testing, they works intentionally. it mean
>  - reduce low order reclaim latency
>  - keep high successfull rate order-9 reclaim under heavy io workload
> 
> However, they obviously need more test. comment are welcome :)

Thanks a lot!

I've been following recent discussions,
however testing is planned to be done in nearer future
since I'm currently "recovering" from large backlog (Thesis).

Andreas Mohr
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