linux-ext4 - Re: fstrim has no effect on a just-mounted filesystem

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Message-ID: <20140311225932.GW1346@redhat.com>
Date:	Tue, 11 Mar 2014 22:59:32 +0000
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: fstrim has no effect on a just-mounted filesystem

On Tue, Mar 11, 2014 at 05:08:19PM -0500, Eric Sandeen wrote:
> blktrace is probably the place to start.  Do you see discard
> requests?  then ext4 is doing its job.  If not, we can trace
> ext4 to see why it's not issuing them, assuming there really
> is work to do.

At the moment I can't get this to work.  The script I'm using is:

----------------------------------------------------------------------
set -e
set -x
trace-cmd record -e all -o /tmp/trace &
pid=$!
fstrim /sysroot
kill $pid; sleep 2
trace-cmd report -i /tmp/trace
----------------------------------------------------------------------

However the last trace-cmd gives an error:

trace-cmd: No such file or directory
  opening '/tmp/trace'

I'll try again tomorrow morning.

Rich.

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