Re: [PATCH v2] generic: concurrent IO test with mixed IO types

[Dave Chinner <david@fromorbit.com>]

On Mon, Jun 08, 2015 at 08:41:11PM +0800, Eryu Guan wrote:
> Test concurrent buffered I/O, DIO, AIO, mmap I/O and splice I/O on the
> same files.
> 
> Signed-off-by: Eryu Guan <eguan@redhat.com>
> ---
> 
> This fio job file has been proven to be potent, it triggers WARNINGs on ext4
> and xfs with 4.1-rc6 kernel.
> 
> ext4: WARNING: at fs/ext4/inode.c:1328
> xfs: WARNING: CPU: 7 PID: 3090 at fs/xfs/xfs_file.c:726 xfs_file_dio_aio_write+0x176/0x2a8 [xfs]()
> 
> The ext4 issue should be fixed by Lukas's patch
> ext4: fix reservation release on invalidatepage for delalloc fs
> 
> And it ever paniced kernel in mm code and hung xfs.
> 
> I reduced the numjobs and iodepth to reduce the test time(~25s on my test host)
> and scale them by $LOAD_FACTOR. And it still could trigger the warning on ext4
> and xfs with reduced workload.
> 
> v2:
> - use mktemp to create tmp fio job file
....
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +fio_config=`mktemp`
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15

By removing the definition of $tmp, you are now dumping all
the temporary files the test harnes creates in /.

> +_cleanup()
> +{
> +	cd /
> +	rm -f $fio_config
> +}

And now not removing them when the test complests...

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com