Return-path: Received: from gir.skynet.ie ([193.1.99.77]:57477 "EHLO gir.skynet.ie" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754654AbZIJMek (ORCPT ); Thu, 10 Sep 2009 08:34:40 -0400 Date: Thu, 10 Sep 2009 13:34:46 +0100 From: Mel Gorman To: Pekka Enberg Cc: Frans Pop , Larry Finger , "John W. Linville" , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, ipw3945-devel@lists.sourceforge.net, Andrew Morton , cl@linux-foundation.org, Assaf Krauss , Johannes Berg , Mohamed Abbas Subject: Re: iwlagn: order 2 page allocation failures Message-ID: <20090910123445.GC31153@csn.ul.ie> References: <200909060941.01810.elendil@planet.nl> <4AA67139.80301@lwfinger.net> <20090909150418.GI24614@csn.ul.ie> <200909091759.33655.elendil@planet.nl> <20090909165545.GK24614@csn.ul.ie> <1252570722.4876.23.camel@penberg-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 In-Reply-To: <1252570722.4876.23.camel@penberg-laptop> Sender: linux-wireless-owner@vger.kernel.org List-ID: On Thu, Sep 10, 2009 at 11:18:42AM +0300, Pekka Enberg wrote: > On Wed, 2009-09-09 at 17:55 +0100, Mel Gorman wrote: > > On Wed, Sep 09, 2009 at 05:59:30PM +0200, Frans Pop wrote: > > > On Wednesday 09 September 2009, Mel Gorman wrote: > > > > Franz, in the full dmesg was there any mention of "SLUB: Unable to > > > > allocate memory on node"? > > > > > > No, nothing at all. I double checked the kernel log, but it was completely > > > quiet in the hours before and after the messages I already posted. > > > > > > > Ok, that in itself is unexpected. > > > > Pekka, it looks from the stack trace that the failure is from > > __alloc_skb and I am guessing the failure path is around here > > > > size = SKB_DATA_ALIGN(size); > > data = kmalloc_node_track_caller(size + sizeof(struct skb_shared_info), > > gfp_mask, node); > > if (!data) > > goto nodata; > > > > Why would the SLUB out-of-memory message not appear? It's hardly > > tripping up on printk_ratelimit() is it? > > That's because it's a large allocation that's passed directly to the > page allocator. See kmalloc_large_node(), for example. > Pants. Is there any chance that could be fixed so that allocation failures within SLUB get consistently reported? -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab