From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 50021] ext4 discard option not working on journal dissabled
 filesystem
Date: Mon,  5 Nov 2012 13:50:28 +0000 (UTC)
Message-ID: <20121105135028.9B60311FB5A@bugzilla.kernel.org>
References: <bug-50021-13602@https.bugzilla.kernel.org/>
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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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