From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id o38CCQ41021568 for ; Thu, 8 Apr 2010 07:12:26 -0500 Received: from mx1.gb1.humyo.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 66D462A9170 for ; Thu, 8 Apr 2010 05:14:17 -0700 (PDT) Received: from mx1.gb1.humyo.com (mx1.gb1.humyo.com [62.44.71.171]) by cuda.sgi.com with ESMTP id 5nvHcdQZYManNfP5 for ; Thu, 08 Apr 2010 05:14:17 -0700 (PDT) Message-ID: <4BBDC92D.8060503@humyo.com> Date: Thu, 08 Apr 2010 13:16:45 +0100 From: John Berthels MIME-Version: 1.0 Subject: Re: PROBLEM + POSS FIX: kernel stack overflow, xfs, many disks, heavy write load, 8k stack, x86-64 References: <4BBC6719.7080304@humyo.com> <20100407140523.GJ11036@dastard> <4BBCAB57.3000106@humyo.com> <20100407234341.GK11036@dastard> <20100408030347.GM11036@dastard> In-Reply-To: <20100408030347.GM11036@dastard> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Dave Chinner Cc: Nick Gregory , linux-mm@kvack.org, xfs@oss.sgi.com, linux-kernel@vger.kernel.org, Rob Sanderson Dave Chinner wrote: > On Thu, Apr 08, 2010 at 09:43:41AM +1000, Dave Chinner wrote: > > And there's a patch attached that stops direct reclaim from writing > back dirty pages - it seems to work fine from some rough testing > I've done. Perhaps you might want to give it a spin on a > test box, John? > Thanks very much for this. The patch is in and soaking on a THREAD_ORDER 1 kernel (2.6.33.2 + patch + stack instrumentation), so far so good, but it's early days. After about 2hrs of uptime: $ dmesg | grep stack | tail -1 [ 60.350766] apache2 used greatest stack depth: 2544 bytes left (which tallies well with your 5 1/2Kbytes usage figure). I'll reply again after it's been running long enough to draw conclusions. jb _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs