Date: Sun, 5 Nov 2006 07:30:37 +0100
From: Adrian Bunk <bunk@stusta.de>
To: Arnaldo Carvalho de Melo <acme@mandriva.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org, lwn@lwn.net
Subject: Re: Top 100 inline functions (make allyesconfig) was Re: [ANNOUNCE] pahole and other DWARF2 utilities
Message-ID: <20061105063037.GU13381@stusta.de>
References: <20061030213318.GA5319@mandriva.com> <20061030203334.09caa368.akpm@osdl.org> <20061103190729.GB25363@mandriva.com> <20061104210330.GA6028@mandriva.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20061104210330.GA6028@mandriva.com>
User-Agent: Mutt/1.5.13 (2006-08-11)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2179
Lines: 57

On Sat, Nov 04, 2006 at 06:03:32PM -0300, Arnaldo Carvalho de Melo wrote:
> On Fri, Nov 03, 2006 at 04:07:29PM -0300, Arnaldo Carvalho de Melo wrote:
> > On Mon, Oct 30, 2006 at 08:33:34PM -0800, Andrew Morton wrote:
> > > On Mon, 30 Oct 2006 18:33:19 -0300
> > > Arnaldo Carvalho de Melo <acme@mandriva.com> wrote:
> > > 
> > > > 	Further ideas on how to use the DWARF2 information include tools
> > > > that will show where inlines are being used, how much code is added by
> > > > inline functions,
> > > 
> > > It would be quite useful to be able to identify inlined functions which are
> > > good candidates for uninlining.
> > 
> > Top 50 inline functions expanded more than once by sum of its expansions
> > in a vmlinux file built for qemu, most things are modules, columns are
> > (inline function name, number of times it was expanded, sum in bytes of
> > its expansions, number of source files where expansions ocurred):
> > 
> > [acme@newtoy guinea_pig-2.6]$ pfunct --total_inline_stats
> > ../../acme/OUTPUT/qemu/net-2.6/vmlinux | grep -v ': 1 ' | sort -k3 -nr |
> > head -50
> > 
> > get_current                        676   5732 155
> 
> Ok, this time for a 'make allyesconfig' build, top 100, for the list of
> all 6021 inline functions that were expanded more than once in this 281
> MB vmlinux image download the 93 KB files at:
>...

Thanks, this is interesting data.

One thing you could do for improving the result:

allyesconfig turns on all debugging option, and there might be functions 
that are significantely larger due to this fact.

Unsetting *DEBUG* options in the .config might bring a better focus 
on the real-world problems.

> - Arnaldo
>...

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/