linux-kernel - Re: [PATCH] dio: lock refcount operations

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Date:	Fri, 27 Oct 2006 16:34:22 -0700
From:	Zach Brown <zach.brown@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dio: lock refcount operations


> zach.brown> The addition of the interrupt masking spin lock acquiry in
> zach.brown> dio_bio_submit() looks alarming.  This lock acquiry existed in
> zach.brown> that path before the recent dio completion patch set.  We
> zach.brown> shouldn't expect significant performance regression from
> zach.brown> returning to the behaviour that existed before the completion
> zach.brown> clean up work. 
> 
> Are you going to quantify this at all?  I think we should.

I could try to take a swing at it next week, sure.

Leaving it for Ken is pretty tempting, though :)

- z
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