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

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Message-Id: <201205021608.q42G8nHM019903@bugzilla.kernel.org>
Date:	Wed, 2 May 2012 16:08:49 GMT
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


Theodore Tso <tytso@....edu> changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@....edu




--- Comment #3 from Theodore Tso <tytso@....edu>  2012-05-02 16:08:48 ---
It sounds like something in userspace is simply calling fsync() very
frequently.  Can you try the following:

echo 1 > /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable 

... then wait for a minute or so, and then capture the output of:

cat /sys/kernel/debug/tracing/trace

That should allow us to see what is causing the excess commits.

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