linux-kernel - Re: [REGRESSION] Recent change to kernel spikes out ccache/distcc

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Message-Id: <4964C0A3.76E4.0078.0@novell.com>
Date:	Wed, 07 Jan 2009 13:48:03 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Sam Ravnborg" <sam@...nborg.org>
Cc:	<ccache@...ts.samba.org>, "Theodore Tso" <tytso@....edu>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] Recent change to kernel spikes out
	 ccache/distcc

>>> Sam Ravnborg <sam@...nborg.org> 07.01.09 14:23 >>>
>On Wed, Jan 07, 2009 at 12:35:09PM +0000, Jan Beulich wrote:
>> >>> Sam Ravnborg <sam@...nborg.org> 07.01.09 12:31 >>>
>> >What is the gain/pain ratio here?
>> 
>> Certainly depends on the pov - it reduces the kernel module (disk) image
>> sizes quite a bit, so from a distro perspective its a move against the ever
>> growing package sizes (and the disk space) hundreds or even thousands
>> of modules require.
>
>The kernel modules seldom export anything so the benefit is minimal here.

Not really, for highly modular distro kernels.

>I did a 15 minutes hack to try ripping the .c -> .s -> .o stuff out.

Looks good to me. In case you decide to revert the stuff for .29, I'll
merge this into my patch.

>Jan - I need some hard numbers to convince me that stripping the
>__crc symbols is worth it.

The on-disk size of the modules in my builds is reduced by about 5% with
this patch (but I can't immediately tell how much of this is due to __crc_*
vs. other symbol stripping).

Jan

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