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Message-ID: <20091106111514.GB5387@yumi.tdiedrich.de> Date: Fri, 6 Nov 2009 12:15:14 +0100 From: Tobias Diedrich <ranma@...edrich.de> 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>, Tobias Oetiker <tobi@...iker.ch>, "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 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 from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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