linux-kernel - Re: [PATCH 11/21] nbd: limit blk

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Date:	Wed, 6 Sep 2006 19:45:01 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Erik Mouw <erik@...ddisk-recovery.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Daniel Phillips <phillips@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 11/21] nbd: limit blk_queue

On Wed, Sep 06 2006, Erik Mouw wrote:
> On Wed, Sep 06, 2006 at 03:16:41PM +0200, Peter Zijlstra wrote:
> > -		disk->queue = blk_init_queue(do_nbd_request, &nbd_lock);
> > +		disk->queue = blk_init_queue_node_elv(do_nbd_request,
> > +				&nbd_lock, -1, "noop");
> 
> So what happens if the noop scheduler isn't compiled into the kernel?

You can't de-select noop, so that cannot happen. But the point is valid
for other choices of io schedulers, which is another reason why this
_elv api addition is a bad idea.

-- 
Jens Axboe

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