Thanks Jens. I can do that for 3.6 kernel.
-Tao

On Thu, Jun 14, 2012 at 3:18 AM, Jens Axboe [off-list ref] wrote:

On Thu, Jun 07 2012, Tao Guo wrote:

quoted

Fix a regression introduced by 7eaceaccab5f40 ("block: remove per-queue
plugging").  In that patch, Jens removed the whole mm_unplug_device()
function, which used to be the trigger to make umem start to work.

We need to implement unplugging to make umem start to work, or I/O will
never be triggered.

Applied this one, dropped the other two. Would still be nice to move
this generic functionality into the block core and unify md/umem in this
regard for 3.6, if you would like to do that.

--
Jens Axboe