From: Pekka Enberg Subject: Re: [PATCH 0/3] Reduce impact to overall system of SLUB using high-order allocations Date: Thu, 12 May 2011 14:13:44 +0300 Message-ID: <4DCBC0E8.5020609@cs.helsinki.fi> References: <1305127773-10570-1-git-send-email-mgorman@suse.de> <1305149960.2606.53.camel@mulgrave.site> <1305153267.2606.57.camel@mulgrave.site> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: David Rientjes , Mel Gorman , Andrew Morton , Colin King , Raghavendra D Prabhu , Jan Kara , Chris Mason , Christoph Lameter , Rik van Riel , Johannes Weiner , linux-fsdevel , linux-mm , linux-kernel , linux-ext4 To: James Bottomley Return-path: Received: from courier.cs.helsinki.fi ([128.214.9.1]:51184 "EHLO mail.cs.helsinki.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752079Ab1ELLNp (ORCPT ); Thu, 12 May 2011 07:13:45 -0400 In-Reply-To: <1305153267.2606.57.camel@mulgrave.site> Sender: linux-ext4-owner@vger.kernel.org List-ID: On 5/12/11 1:34 AM, James Bottomley wrote: > On Wed, 2011-05-11 at 15:28 -0700, David Rientjes wrote: >> On Wed, 11 May 2011, James Bottomley wrote: >> >>> OK, I confirm that I can't seem to break this one. No hangs visible, >>> even when loading up the system with firefox, evolution, the usual >>> massive untar, X and even a distribution upgrade. >>> >>> You can add my tested-by >>> >> Your system still hangs with patches 1 and 2 only? > Yes, but only once in all the testing. With patches 1 and 2 the hang is > much harder to reproduce, but it still seems to be present if I hit it > hard enough. Patches 1-2 look reasonable to me. I'm not completely convinced of patch 3, though. Why are we seeing these problems now? This has been in mainline for a long time already. Shouldn't we fix kswapd? Pekka