From: bugzilla-daemon@bugzilla.kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 50021] ext4 discard option not working on journal dissabled filesystem
Date: Mon, 5 Nov 2012 13:50:28 +0000 (UTC) [thread overview]
Message-ID: <20121105135028.9B60311FB5A@bugzilla.kernel.org> (raw)
In-Reply-To: <bug-50021-13602@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=50021
Tao Ma <tm@tao.ma> changed:
What |Removed |Added
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CC| |tm@tao.ma
--- Comment #1 from Tao Ma <tm@tao.ma> 2012-11-05 13:50:28 ---
Interesting, it works fine here with my intel ssd.
So could you please do:
1. mount -t debugfs none /sys/kernel/debug/
2. echo 1 > /sys/kernel/debug/tracing/events/ext4/ext4_discard_blocks/enable
3. run you test
4. after 'rm', do
cat /sys/kernel/debug/tracing/trace
If your see something like
jbd2/sdb2-8-23853 [000] .... 30125.695303: ext4_discard_blocks: dev 8,18 blk
34816 count 3072
rm-23870 [000] .... 30130.908415: ext4_discard_blocks: dev 8,17
blk 34816 count 3072
(The first one is captured by the device with journal and the second one is
captured by the device without journal).
Then that does mean ext4 has sent out the discard command to the underlying
device.
btw, my kernel version is 3.6.
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next prev parent reply other threads:[~2012-11-05 13:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-03 23:22 [Bug 50021] New: ext4 discard option not working on journal dissabled filesystem bugzilla-daemon
2012-11-05 13:50 ` bugzilla-daemon [this message]
2012-11-05 13:58 ` [Bug 50021] " bugzilla-daemon
2012-11-05 14:13 ` bugzilla-daemon
2012-11-05 17:35 ` bugzilla-daemon
2012-11-05 18:00 ` bugzilla-daemon
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