linux-ext4 - [Bug 42895] jbd2 makes all system unresponsive

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Message-Id: <20120516163439.916CD11FCF6@bugzilla.kernel.org>
Date:	Wed, 16 May 2012 16:34:39 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 42895] jbd2 makes all system unresponsive

https://bugzilla.kernel.org/show_bug.cgi?id=42895

--- Comment #13 from Eugene <ivanovstm2@...il.ru>  2012-05-16 16:34:39 ---
Thanks, now it works.
Traced system for around 10mins and I don't see previously unseen processes.
Just normal system activity. But there was a number of hdd writes (around 6 in
10mins) which doesn't have corresponding entries in trace results and separated
from entries by roughly 30sec (flush?) - that's not including 1-2 writes
closely following (~3-5sec) almost each entry (jbd2?).
http://paste.ubuntu.com/990927/

Can I trace some function which gives output in trace results when actual write
takes place but shows initial cause of the write (not just flush or jbd2)? Like
block_dump but more informative?

If it's not possible then for now I'm going to presume that it's just the way
how system works. But still it's lots of flushes/jbd2 following writes of even
small files:
https://launchpadlibrarian.net/101378473/15mins_almost_idle.txt

For example in above block_dump Network Manager's "timestamps" file is 4910
bytes long and followed by ~20 writes by jbd2 and then by 10 flushes.
Or xfconfd's "xfce4-panel.xml" is 9467 bytes long and followed by 8 writes by
jbd2 and then by 20 flushes all around the disk.
Is it normal?

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