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 SMTP id D505B6B004D for ; Mon, 5 Oct 2009 17:34:29 -0400 (EDT) From: Frans Pop Subject: Re: [Bug #14141] order 2 page allocation failures in iwlagn Date: Mon, 5 Oct 2009 23:34:16 +0200 References: <3onW63eFtRF.A.xXH.oMTxKB@chimera> <200910050851.02056.elendil@planet.nl> <20091005085739.GB5452@csn.ul.ie> In-Reply-To: <20091005085739.GB5452@csn.ul.ie> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200910052334.23833.elendil@planet.nl> Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Pekka Enberg , Reinette Chatre , Bartlomiej Zolnierkiewicz , Karol Lewandowski , linux-mm@kvack.org, David Rientjes List-ID: On Monday 05 October 2009, Mel Gorman wrote: > On Mon, Oct 05, 2009 at 08:50:58AM +0200, Frans Pop wrote: > > On Monday 05 October 2009, Frans Pop wrote: > > > I'll dig into this a bit more as it looks like this should be > > > reproducible, probably even without the kernel build. Next step is > > > to see how .30 behaves in the same situation. > > > > This looks conclusive. I tested .30 and .32-rc3 from clean reboots and > > only starting gitk. I only started music playing in the background > > (amarok) from an NFS share to ensure network activity. > > > > With .32-rc3 I got 4 SKB allocation errors while starting the *second* > > gitk instance. And the system was completely frozen with music stopped > > until gitk finished loading. > > > > With .30 I was able to start *three* gitk's (which meant 2 of them got > > (partially) swapped out) without any allocation errors. And with the > > system remaining relatively responsive. There was a short break in the > > music while I started the 2nd instance, but it just continued playing > > afterwards. There was also some mild latency in the mouse cursor, but > > nothing like the full desktop freeze I get with .32-rc3. > > > > One thing I should mention: my swap is an LVM volume that's in a VG > > that's on a LUKS encrypted partition. > > > > Does this give you enough info to go on, or should I try a bisection? > > I'll be trying to reproduce it, but it's unlikely I'll manage to > reproduce it reliably as there may be a specific combination of hardware > necessary as well. What I'm going to try is writing a module that > allocates order-5 every second GFP_ATOMIC and see can I reproduce using > scenarios similar to yours but it'll take some time with no guarantee of > success. If you could bisect it, it would be fantastic. And the winner is: 2ff05b2b4eac2e63d345fc731ea151a060247f53 is first bad commit commit 2ff05b2b4eac2e63d345fc731ea151a060247f53 Author: David Rientjes Date: Tue Jun 16 15:32:56 2009 -0700 oom: move oom_adj value from task_struct to mm_struct I'm confident that the bisection is good. The test case was very reliable while zooming in on the merge from akpm. Cheers, FJP -- 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