linux-kernel - Re: [PATCH 13/25] Inline __rmqueue

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Message-ID: <20090421084827.GF12713@csn.ul.ie>
Date:	Tue, 21 Apr 2009 09:48:27 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.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>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 13/25] Inline __rmqueue_smallest()

On Tue, Apr 21, 2009 at 10:58:15AM +0300, Pekka Enberg wrote:
> On Mon, 2009-04-20 at 23:19 +0100, Mel Gorman wrote:
> > Inline __rmqueue_smallest by altering flow very slightly so that there
> > is only one call site. This allows the function to be inlined without
> > additional text bloat.
> 
> Quite frankly, I think these patch changelogs could use some before and
> after numbers for "size mm/page_alloc.o" because it's usually the case
> that kernel text shrinks when you _remove_ inlines.
> 

I can generate that although it'll be a bit misleading because stack
parameters are added earlier in the series that get eliminated later due
to inlines. Shuffling them around won't help a whole lot.

Inline for only one call site though saves text in this series. For a
non-inlined function, the calling convension has to be obeyed and for a
large number of parameters like this functions, that can be sizable.

I'll regenerate the figures though.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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