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From: Denys Vlasenko <vda.linux@googlemail.com>
To: Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH 0/4] build system: section garbage collection for vmlinux
Date: Wed, 12 Sep 2007 21:19:57 +0100
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Cc: Sam Ravnborg <sam@ravnborg.org>, linux-kernel@vger.kernel.org
References: <200709112105.34301.vda.linux@googlemail.com> <p73veagykwv.fsf@bingen.suse.de>
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On Tuesday 11 September 2007 22:03, Andi Kleen wrote:
> Denys Vlasenko <vda.linux@googlemail.com> writes:
> > 
> >    text    data     bss     dec     hex filename
> > 5159478 1005139  406784 6571401  644589 linux-2.6.23-rc4.org/vmlinux
> > 5131822  996090  401439 6529351  63a147 linux-2.6.23-rc4.gc/vmlinux
> > 
> > In this particular case, 402 objects were discarded, saving 42 kb.
> 
> I wonder how many of those are 100% unused on all configurations? 
> That could be an useful janitor task to clean up

With CONFIG_DISCARD_UNUSED_SECTIONS=y ld will helpfully flood you
with the list of discarded stuff. I pass --print-gc-sections to it.
--
vda