lkml.org 
[lkml]   [2007]   [Sep]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 0/3] build system: section garbage collection for vmlinux
From
Date
On Wed, 2007-09-05 at 21:31 +0200, Adrian Bunk wrote:
> On Wed, Sep 05, 2007 at 08:14:12PM +0100, Denys Vlasenko wrote:
> > On Wednesday 05 September 2007 19:38, Daniel Walker wrote:
> > > > > You version doesn't work with CONFIG_MODULES right?
> > > >
> > > > It works with CONFIG_MODULES.
> > >
> > > Really? Take a look at this version,
> > >
> > > http://lkml.org/lkml/2006/6/4/169
> > >
> > > Marcello had to implement a two pass build to add back symbol used in
> > > modules which got removed from the main kernel.. You don't appear to do
> > > that. Marcelo also claims better size reduction than you.
> >
> > This will discard EXPORT_SYMBOLs potentially used by
> > out-of-tree modules.
> >
> > I also saw ~10% size reductions, but then at run-time test modules
> > failed to load, they didn't find needed symbols.
> >
> > OTOH if I know that I am not going to be using such modules,
> > then this can be done. Will require another CONFIG_xxx, though.
>
> One point to keep in mind is that the space penalty of CONFIG_MODULES=y
> is so big that CONFIG_MODULES=n is actually the most interesting case
> for small systems that really need small kernels.

Marcelo's version actual deals with the CONFIG_MODULES=y penalty , which
is interesting to me .. It removes symbols added for CONFIG_MODULES
which actually aren't used .. So CONFIG_MODULES=y is just as interesting
as without (to me at least..).

Daniel

-
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/

\
 
 \ /
  Last update: 2007-09-05 21:39    [W:0.149 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site