Re: [patch 00/2] improve .text size on gcc 4.0 and newer compilers

[Kurt Wall <kwall@kurtwerks.com>]

On Fri, Dec 30, 2005 at 03:03:22AM +0100, Tim Schmielau took 0 lines to write:

>    http://www.physik3.uni-rostock.de/tim/kernel/2.6/deinline.patch.gz
> The resulting kernel actually booted (am running it right now). However, 
> catching just these low-hanging fruits doesn't get me anywhere near 
> Arjan's numbers. For my non-representative personal config I get (on 
> i386 with -unit-at-a-time):
> 
>    > size vmlinux*
>       text    data     bss     dec     hex filename
>    2197105  386568  316840 2900513  2c4221 vmlinux
>    2144453  392100  316840 2853393  2b8a11 vmlinux.deinline

For two more datapoints, also from an x86_64 2.6.15-rc7 kernel, here
are the values for my main desktop .config and an allyesconfig .config.
The .deinline kernels have the above patch applied and are also built
with CONFIG_CC_OPTIMIZE_FOR_SIZE=y.

$ size vmlinux.krw*
   text    data     bss     dec     hex filename
2338371  462208  479920 3280499  320e73 vmlinux.krw
2309384  468168  479920 3257472  31b480 vmlinux.krw.deinline

.text is only 1.24% smaller

For an allyesconfig, the results are slightly worse:

$ size vmlinux*
   text    data     bss     dec     hex filename
24076648        7465782 1996904 33539334        1ffc506 vmlinux
23791161        7513590 1996904 33301655        1fc2497 vmlinux.deinline

.text is only 1.19% smaller

Kurt
-- 
Nothing cures insomnia like the realization that it's time to get up.