linux-ext4 - Re: [PATCH 6/6] add defragmentation stress test for ext4

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Date:	Thu, 27 Sep 2012 11:15:22 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hch@....de, xfs@....sgi.com
Subject: Re: [PATCH 6/6] add defragmentation stress test for ext4

On Mon, Sep 24, 2012 at 06:23:21PM +0400, Dmitry Monakhov wrote:
> Perform various regression tests for ext4defrag  subsystem
> 
>  Test1: Defragment file while other task does direct AIO
>  Test2: Perform defragmentation on file under buffered AIO
>  	while third task does direct AIO to donor file
>  Test3: Two defrag tasks use common donor file.
>  Test4: Stress defragmentation. Several threads pefrorm
>  	fragmentation at random position use inplace=1 will
> 	allocate and free blocks inside defrag event improve
> 	load pressure.

Please do these as 4 separate tests so that it is easy to
isolate/reproduce failures caused by a specific test that is being
run.

Same comments as previous two patches, as well.

> +_workout()
> +{
> +	echo ""
> +	echo " Start defragment activity "
> +	echo ""
> +	cat $tmp-$seq.fio >>  $seq.full
> +	run_check $FIO_PROG $tmp-$seq.fio >>  $seq.full
> +}
> +
> +# real QA test starts here
> +_supported_fs generic
> +_supported_os Linux
> +_supported_fs ext4
> +_need_to_be_root
> +_require_scratch
> +_require_fio $tmp-$seq.fio

Even though e4defrag is not used, it's probably still a good idea to
call _require_defrag to check for systems that have a recent enough
ext4 to run defrag on. e.g. a recent fio on an old distro might
result in fio saying "I understand this job file" but then not be
able to run defrag...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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