From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id CBF0C6B0044 for ; Fri, 6 Nov 2009 06:15:19 -0500 (EST) Date: Fri, 6 Nov 2009 12:15:14 +0100 From: Tobias Diedrich Subject: Re: [PATCH 0/5] Candidate fix for increased number of GFP_ATOMIC failures V2 Message-ID: <20091106111514.GB5387@yumi.tdiedrich.de> References: <1256221356-26049-1-git-send-email-mel@csn.ul.ie> <20091106060323.GA5528@yumi.tdiedrich.de> <20091106092447.GC25926@csn.ul.ie> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091106092447.GC25926@csn.ul.ie> Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: Frans Pop , Jiri Kosina , Sven Geggus , Karol Lewandowski , Tobias Oetiker , "Rafael J. Wysocki" , David Miller , Reinette Chatre , Kalle Valo , David Rientjes , KOSAKI Motohiro , Mohamed Abbas , Jens Axboe , "John W. Linville" , Pekka Enberg , Bartlomiej Zolnierkiewicz , Greg Kroah-Hartman , Stephan von Krawczynski , Kernel Testers List , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "linux-mm@kvack.org" List-ID: Mel Gorman wrote: > On Fri, Nov 06, 2009 at 07:03:23AM +0100, Tobias Diedrich wrote: > > Mel Gorman wrote: > > > [No BZ ID] Kernel crash on 2.6.31.x (kcryptd: page allocation failure..) > > > This apparently is easily reproducible, particular in comparison to > > > the other reports. The point of greatest interest is that this is > > > order-0 GFP_ATOMIC failures. Sven, I'm hoping that you in particular > > > will be able to follow the tests below as you are the most likely > > > person to have an easily reproducible situation. > > > > I've also seen order-0 failures on 2.6.31.5: > > Note that this is with a one process hogging and mlocking memory and > > min_free_kbytes reduced to 100 to reproduce the problem more easily. > > > > Is that a vanilla, with patches 1-3 applied or both? That was on vanilla 2.6.31.5. I tried 2.6.31.5 before with patches 1+2 and netconsole enabled and still got the order-1 failures (apparently I get order-1 failures with netconsole and order-0 failures without). > > I tried bisecting the issue, but in the end without memory pressure > > I can't reproduce it reliably and with the above mentioned pressure > > I get allocation failures even on 2.6.30.o > > To be honest, it's not entirely unexpected with min_free_kbytes set that > low. The system should cope with a certain amount of pressure but with > pressure and a low min_free_kbytes, the system will simply be reacting > too late to free memory in the non-atomic paths. Maybe I should try again on 2.6.30 without netconsole und try increasing min_free_kbytes until the allocation failures disappear and try to bisect again with that setting... -- Tobias PGP: http://8ef7ddba.uguu.de -- 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