From: Fengguang Wu Subject: Re: regression: 100% io-wait with 2.6.24-rcX Date: Sun, 13 Jan 2008 19:59:33 +0800 Message-ID: <400275229.00373@ustc.edu.cn> References: <200801071151.11200.lists@naasa.net> <200801130905.44855.jplatte@naasa.net> <400212488.11031@ustc.edu.cn> <200801131049.33111.jplatte@naasa.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Peter Zijlstra , Ingo Molnar , linux-kernel@vger.kernel.org, "linux-ext4@vger.kernel.org" To: Joerg Platte Return-path: Received: from smtp.ustc.edu.cn ([202.38.64.16]:38683 "HELO ustc.edu.cn" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1755913AbYANBrA (ORCPT ); Sun, 13 Jan 2008 20:47:00 -0500 Content-Disposition: inline In-Reply-To: <200801131049.33111.jplatte@naasa.net> Message-Id: Sender: linux-ext4-owner@vger.kernel.org List-ID: On Sun, Jan 13, 2008 at 10:49:31AM +0100, Joerg Platte wrote: > register_jprobe(ext2_writepage) = 0 > register_jprobe(requeue_io) = 0 > register_kprobe(submit_bio) = 0 > requeue_io: > inode 114019(sda7/.kde) count 2,2 size 0 pages 1 > 0 2 0 U____ > requeue_io: > inode 114025(sda7/cache-ibm) count 2,1 size 0 pages 1 > 0 2 0 U____ > requeue_io: > inode 114029(sda7/socket-ibm) count 2,3 size 0 pages 1 > 0 2 0 U____ > requeue_io: > inode 114017(sda7/0266584877) count 3,6 size 0 pages 1 > 0 2 0 U____ It helps. Thank you, Joerg! The .kde/cache-ibm/socket-ibm/0266584877 above are directories. It's weird that dirs would have their own mappings in ext2. In particular this bug is triggered because the dir mapping page has PAGECACHE_TAG_DIRTY set and PG_dirty cleared, staying in an inconsistent state. Fengguang