From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753920Ab0CCMHb (ORCPT ); Wed, 3 Mar 2010 07:07:31 -0500 Received: from oceanic.CalvaEDI.COM ([89.202.194.168]:58450 "EHLO oceanic.CalvaEDI.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753742Ab0CCMHa (ORCPT ); Wed, 3 Mar 2010 07:07:30 -0500 Message-ID: <4B8E59CC.2030004@Calva.COM> Date: Wed, 03 Mar 2010 13:45:00 +0100 From: John Hughes User-Agent: Mozilla-Thunderbird 2.0.0.22 (X11/20090706) MIME-Version: 1.0 To: Jens Axboe CC: Andrew Morton , bugzilla-daemon@bugzilla.kernel.org, bugme-daemon@bugzilla.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [Bugme-new] [Bug 15426] New: Running many copies of bonnie++ on different filesystems seems to deadlock in sync References: <20100302161627.bf02d0a2.akpm@linux-foundation.org> <4B8E517E.3010702@Calva.COM> <20100303115015.GN5768@kernel.dk> <4B8E5805.30505@Calva.COM> <20100303120317.GP5768@kernel.dk> In-Reply-To: <20100303120317.GP5768@kernel.dk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe wrote: > On Wed, Mar 03 2010, John Hughes wrote: > >> Just a thought. What exactly is sync(2) supposed to do - block until >> there are no more dirty pages, or block until all pages that were dirty >> when the sync was done are clean? In other words is the problem simply >> that pages are being dirtied faster than the sync is writing them out? >> > > Our sync is currently broken in that regard, since it'll wait for too > long. We have a debated patch going, I have included it below. Any > chance you could give it a whirl? > > The semantics of sync are supposed to be 'wait for dirty IO generated > BEFORE this sync call'. > Ok, I will try this patch and get back to you.