Re: Arjan's noinline Patch

[Kurt Wall <kwall@kurtwerks.com>]

On Mon, Jan 02, 2006 at 12:04:04PM +0100, Ingo Molnar took 0 lines to write:
> 
> * Kurt Wall <kwallnator@gmail.com> wrote:
> 
> > After applying Arjan's noline patch (http://www.fenrus.org/noinlin), I 
> > see almost a 10% reduction in the size of .text (against 2.6.15-rc6) 
> > with no apparent errors and no reduction in functionality:
> 
> just to make sure: this was with -Os _also_ turned on, right? So what 
> you measured was the effect of Arjan's patch plus -Os, combined, 
> correct?

Yes. And it was a faulty approach. I've posted new results with the 
effects of Arjan's patch. CONFIG_CC_OPTIMIZE_FOR_SIZE was enabled for
all kernels.

> if yes you should measure the two effects in isolation, like the vmlinux 
> numbers i posted. Every patch applied and every change to .config 
> options must be measured separately, to get valid results. This doesnt 
> invalidate your raw vmlinux measurements - you simply need to add a 
> "Arjan's patch applied but no -Os turned on" number - but it does 
> invalidate your conclusion quoted above.

Quite so. I'm working on the "no -Os" case now.

Kurt
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