From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with SMTP id 30C506B004D for ; Thu, 22 Oct 2009 06:27:35 -0400 (EDT) Date: Thu, 22 Oct 2009 12:27:32 +0200 (CEST) From: Tobias Oetiker Subject: Re: [Bug #14141] order 2 page allocation failures (generic) In-Reply-To: <20091020133957.GG11778@csn.ul.ie> Message-ID: References: <20091019140957.GE9036@csn.ul.ie> <20091019145954.GH9036@csn.ul.ie> <20091020105746.GD11778@csn.ul.ie> <20091020125139.GF11778@csn.ul.ie> <20091020133957.GG11778@csn.ul.ie> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: Frans Pop , Pekka Enberg , David Rientjes , KOSAKI Motohiro , "Rafael J. Wysocki" , Linux Kernel Mailing List , Reinette Chatre , Bartlomiej Zolnierkiewicz , Karol Lewandowski , Mohamed Abbas , "John W. Linville" , linux-mm@kvack.org, jens.axboe@oracle.com List-ID: Hi Mel, Tuesday Mel Gorman wrote: > 4. Does the following patch help by any chance? > > Thanks > > ==== CUT HERE ==== > vmscan: Force kswapd to take notice faster when high-order watermarks are being hit > > When a high-order allocation fails, kswapd is kicked so that it reclaims > at a higher-order to avoid direct reclaimers stall and to help GFP_ATOMIC > allocations. Something has changed in recent kernels that affect the timing > where high-order GFP_ATOMIC allocations are now failing with more frequency, > particularly under pressure. This patch forces kswapd to notice sooner that > high-order allocations are occuring by checking when watermarks are hit early > and by having kswapd restart quickly when the reclaim order is increased. > > Not-signed-off-by-because-this-is-a-hatchet-job: Mel Gorman > --- it does seem to help ... I have been running it from 6am to 12am on our server now and have not yet seen any issues ... will shout if I do ... cheers tobi -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch tobi@oetiker.ch ++41 62 775 9902 / sb: -9900 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org