From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15906] serious performance regression in "umount" on ext4 over
 LVM
Date: Wed, 5 May 2010 04:46:18 GMT
Message-ID: <201005050446.o454kIrw014927@demeter.kernel.org>
References: <bug-15906-13602@https.bugzilla.kernel.org/>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
To: linux-ext4@vger.kernel.org
Return-path: <linux-ext4-owner@vger.kernel.org>
Received: from demeter.kernel.org ([140.211.167.39]:39814 "EHLO
	demeter.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752727Ab0EEEqS (ORCPT
	<rfc822;linux-ext4@vger.kernel.org>); Wed, 5 May 2010 00:46:18 -0400
Received: from demeter.kernel.org (localhost.localdomain [127.0.0.1])
	by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o454kI1U014929
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO)
	for <linux-ext4@vger.kernel.org>; Wed, 5 May 2010 04:46:18 GMT
In-Reply-To: <bug-15906-13602@https.bugzilla.kernel.org/>
Sender: linux-ext4-owner@vger.kernel.org
List-ID: <linux-ext4.vger.kernel.org>

https://bugzilla.kernel.org/show_bug.cgi?id=15906





--- Comment #12 from Eric Sandeen <sandeen@redhat.com>  2010-05-05 04:46:16 ---

so basically:

sync_inodes_sb
  bdi_sync_writeback (sync_mode = WB_SYNC_ALL)
    ...

writeback_inodes_wb
  writeback_single_inode
    ext4_write_inode
      if (WB_SYNC_ALL)
        ext4_force_commit <--- ouch.

-- 
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching the assignee of the bug.