linux-kernel - Re: [PATCH 13/20] Inline buffered

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Date:	Mon, 23 Feb 2009 09:24:19 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>
Subject: Re: [PATCH 13/20] Inline buffered_rmqueue()

On Mon, Feb 23, 2009 at 1:17 AM, Mel Gorman <mel@....ul.ie> wrote:
> buffered_rmqueue() is in the fast path so inline it. This incurs text
> bloat as there is now a copy in the fast and slow paths but the cost of
> the function call was noticeable in profiles of the fast path.
>
> Signed-off-by: Mel Gorman <mel@....ul.ie>
> ---
>  mm/page_alloc.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index d8a6828..2383147 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1080,7 +1080,8 @@ void split_page(struct page *page, unsigned int order)
>  * we cheat by calling it from here, in the order > 0 path.  Saves a branch
>  * or two.
>  */
> -static struct page *buffered_rmqueue(struct zone *preferred_zone,
> +static inline
> +struct page *buffered_rmqueue(struct zone *preferred_zone,
>                        struct zone *zone, int order, gfp_t gfp_flags,
>                        int migratetype)
>  {

I'm not sure if this is changed now but at least in the past, you had
to use __always_inline to force GCC to do the inlining for all
configurations.
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