Re: [PATCH] Optimize lock in queue unplugging

[Alasdair G Kergon]

On Wed, Apr 30, 2008 at 09:14:15AM +0200, Jens Axboe wrote:
> So it's basically dm calling into blk_unplug() all the time, which
> doesn't check if the queue is plugged. The reason why I didn't like the
> initial patch is that ->unplug_fn() really should not be called unless
> the queue IS plugged. So how about this instead:
> 
> http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=c44993018887e82abd49023e92e8d8b6000e03ed
> 
> That's a lot more appropriate, imho.
 
Makes sense to me, ack.

Alasdair
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