Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754139AbYJBNNL (ORCPT ); Thu, 2 Oct 2008 09:13:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753520AbYJBNM5 (ORCPT ); Thu, 2 Oct 2008 09:12:57 -0400 Received: from casper.infradead.org ([85.118.1.10]:52067 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753472AbYJBNM4 (ORCPT ); Thu, 2 Oct 2008 09:12:56 -0400 Date: Thu, 2 Oct 2008 06:12:36 -0700 From: Arjan van de Ven To: Andrew Morton Cc: Jens Axboe , linux-kernel@vger.kernel.org, Alan Cox Subject: Re: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority Message-ID: <20081002061236.3c71c877@infradead.org> In-Reply-To: <20081001235501.2b7f50fe.akpm@linux-foundation.org> References: <20081001200034.65eb67d6@infradead.org> <20081001215638.3a65134c.akpm@linux-foundation.org> <20081002062736.GR19428@kernel.dk> <20081001235501.2b7f50fe.akpm@linux-foundation.org> Organization: Intel X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.12; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1180 Lines: 30 On Wed, 1 Oct 2008 23:55:01 -0700 > > I've forgotten where that code is now, but I don't think it was ever > revisited. It should be. > > So. Where are these atime updaters getting blocked? my reproducer is sadly very simple (claws-mail is my mail client that uses maildir) Process claws-mail (4896) Total: 2829.7 msec EXT3: Waiting for journal access 2491.0 msec 88.4 % Writing back inodes 160.9 msec 5.7 % synchronous write 78.8 msec 3.0 % is an example of such a trace (this is with patch, without patch the numbers are about 3x bigger) Waiting for journal access is "journal_get_write_access" Writing back inodes is "writeback_inodes" synchronous write is "do_sync_write" -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/