linux-kernel - Re: CFS review

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Message-ID: <Pine.LNX.4.64.0708011422000.1817@scrub.home>
Date:	Wed, 1 Aug 2007 14:27:03 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Mike Galbraith <efault@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: CFS review

Hi,

On Wed, 1 Aug 2007, Ingo Molnar wrote:

> * Roman Zippel <zippel@...ux-m68k.org> wrote:
> 
> > [...] the increase in code size:
> > 
> > 2.6.22:
> >    text    data     bss     dec     hex filename
> >   10150      24    3344   13518    34ce kernel/sched.o
> > 
> > recent git:
> >    text    data     bss     dec     hex filename
> >   14724     228    2020   16972    424c kernel/sched.o
> > 
> > That's i386 without stats/debug. [...]
> 
> that's without CONFIG_SMP, right? :-) On SMP they are about net break 
> even:
> 
>      text    data     bss     dec     hex filename
>     26535    4173      24   30732    780c kernel/sched.o-2.6.22
>     28378    2574      16   30968    78f8 kernel/sched.o-2.6.23-git

That's still quite an increase in some rather important code paths and 
it's not just the code size, but also code complexity which is important 
- a major point I tried to address in my review.

> (plus a further ~1.5K per CPU data reduction which is not visible here) 

That's why I mentioned the increased runtime memory usage...

bye, Roman
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