netdev - Re: [PATCH 0/5] Candidate fix for increased number of GFP

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Date:	Mon, 26 Oct 2009 18:37:36 +0100 (CET)
From:	Tobias Oetiker <tobi@...iker.ch>
To:	Mel Gorman <mel@....ul.ie>
cc:	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	David Miller <davem@...emloft.net>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Kalle Valo <kalle.valo@....fi>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Stephan von Krawczynski <skraw@...net.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"linux-mm@...ck.org\\\"" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/5] Candidate fix for increased number of GFP_ATOMIC
 failures V2

Hi Mel,

I have no done additional tests ... and can report the following

Thursday Mel Gorman wrote:

>   1/5 page allocator: Always wake kswapd when restarting an allocation attempt after direct reclaim failed
>   2/5 page allocator: Do not allow interrupts to use ALLOC_HARDER
>
>
> 	These patches correct problems introduced by me during the 2.6.31-rc1
> 	merge window. The patches were not meant to introduce any functional
> 	changes but two were missed.
>
> 	If your problem goes away with just these two patches applied,
> 	please tell me.

1+2 do not help

> Test 3: If you are getting allocation failures, try with the following patch
>
>   3/5 vmscan: Force kswapd to take notice faster when high-order watermarks are being hit
>
> 	This is a functional change that causes kswapd to notice sooner
> 	when high-order watermarks have been hit. There have been a number
> 	of changes in page reclaim since 2.6.30 that might have delayed
> 	when kswapd kicks in for higher orders
>
> 	If your problem goes away with these three patches applied, please
> 	tell me

1+2+3 do not help either

> Test 4: If you are still getting failures, apply the following
>   4/5 page allocator: Pre-emptively wake kswapd when high-order watermarks are hit
>
> 	This patch is very heavy handed and pre-emptively kicks kswapd when
> 	watermarks are hit. It should only be necessary if there has been
> 	significant changes in the timing and density of page allocations
> 	from an unknown source. Tobias, this patch is largely aimed at you.
> 	You reported that with patches 3+4 applied that your problems went
> 	away. I need to know if patch 3 on its own is enough or if both
> 	are required
>
> 	If your problem goes away with these four patches applied, please
> 	tell me

3 allone does not help
3+4 does ...

cheers
tobi
-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi@...iker.ch ++41 62 775 9902 / sb: -9900
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