linux-kernel - Re: [PATCH 06/11] DIO: Inline the complete submission path v2

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Date:	Mon, 08 Aug 2011 14:14:43 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hch@...radead.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 06/11] DIO: Inline the complete submission path v2

Andi Kleen <andi@...stfloor.org> writes:

> From: Andi Kleen <ak@...ux.intel.com>
>
> Add inlines to all the submission path functions. While this increases
> code size it also gives gcc a lot of optimization opportunities
> in this critical hotpath.
>
> In particular -- together with some other changes -- this
> allows gcc to get rid of the unnecessary clearing of
> sdio at the beginning and optimize the messy parameter passing.
> Any non inlining of a function which takes a sdio parameter
> would break this optimization because they cannot be done if the
> address of a structure is taken.

Do you want to use __always_inline, then?

Cheers,
Jeff
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