linux-ext4 - [Bug 15906] performance regression in "umount" of filesystems using barriers

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Message-Id: <201005261644.o4QGijFc008347@demeter.kernel.org>
Date:	Wed, 26 May 2010 16:44:45 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15906] performance regression in "umount" of filesystems using
 barriers

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

Brian Bloniarz <phunge0@...mail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |phunge0@...mail.com

--- Comment #30 from Brian Bloniarz <phunge0@...mail.com>  2010-05-26 16:44:37 ---
I'm trying to get these fixes merged into the ubuntu release, because ubuntu's
workaround has issues. The downstream bug for this is
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/585092

I backported to ubuntu's kernel, which took a little fixup. You'll find the
patches attached on that bug.
0001-writeback-fix-WB_SYNC_NONE-writeback-from-umount.patch
0002-writeback-Update-dirty-flags-in-two-steps.patch
0003-writeback-ensure-that-WB_SYNC_NONE-writeback-with-sb.patch

If anyone who's familiar with these code paths could review my backports, I'd
appreciate it.  They apply cleanly to mainline v2.6.32.11, which is the base
for ubuntu's kernel.

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