linux-ext4 - [Bug 39072] jbd2 writes on disk every few seconds

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Message-Id: <201107110315.p6B3Fpl2024329@demeter1.kernel.org>
Date:	Mon, 11 Jul 2011 03:15:51 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 39072] jbd2 writes on disk every few seconds

https://bugzilla.kernel.org/show_bug.cgi?id=39072


Lars Stokholm <lars.stokholm@...il.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lars.stokholm@...il.com




--- Comment #2 from Lars Stokholm <lars.stokholm@...il.com>  2011-07-10 20:08:51 ---
I just wanted to say that I agree

--- Comment #3 from Lars Stokholm <lars.stokholm@...il.com>  2011-07-10 20:13:38 ---
Oops. Sorry, I'm very new to this bug list, I committed before I should have.

I just wanted to say that I agree with you Theodore. Going into single user
mode helps. In fact just killing off my daemons (syslog-ng, cron and so on)
along with X was enough. I didn't have to go to single user mode.

--- Comment #4 from Theodore Tso <tytso@....edu>  2011-07-11 03:15:46 ---
Created an attachment (id=65212)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=65212)
Journal tracepoint patch

The following patch should help people figure out which process is responsible
for starting an jbd2 transaction handle.   After applying the patch, enable it
via:

echo 1 > /sys/kernel/debug/tracing/events/ext4/ext4_journal_start/enable
echo 1 > /sys/kernel/debug/tracing/events/jbd2/jbd2_run_stats/enable
cat /sys/kernel/debug/tracing/trace_pipe

... and wait.

(All of this assumes you have ftrace enabled, of course).

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