long hangs when deleting large directories (3.0-rc3)

[Christoph Hellwig]

On Sat, Jun 18, 2011 at 04:19:50PM +0200, Markus Trippelsdorf wrote:
> Running the latest git kernel (3.0-rc3) my machine hangs for long
> periods (1-2 sec) whenever I delete a large directory recursively on my
> xfs partition. During the hang I cannot move the mouse pointer or use
> the keyboard (but the music keeps playing without stuttering). A quick
> way to reproduce is to "rm -fr" a kernel tree. 

Does this also happen when using the deadline I/O schedule, that is
after a:

echo "deadline" > /sys/block/sda/queue/scheduler