linux-kernel - Re: [PATCH 1/7] vmscan: raise the bar to PAGEOUT_IO

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Date:	Thu, 05 Aug 2010 11:19:34 -0400
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 1/7] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls

On 08/05/2010 02:12 AM, KOSAKI Motohiro wrote:
> From: Wu Fengguang<fengguang.wu@...el.com>
>
> Fix "system goes unresponsive under memory pressure and lots of
> dirty/writeback pages" bug.
>
> 	http://lkml.org/lkml/2010/4/4/86
>
> In the above thread, Andreas Mohr described that
>
> 	Invoking any command locked up for minutes (note that I'm
> 	talking about attempted additional I/O to the _other_,
> 	_unaffected_ main system HDD - such as loading some shell
> 	binaries -, NOT the external SSD18M!!).
>
> This happens when the two conditions are both meet:
> - under memory pressure
> - writing heavily to a slow device

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

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