linux-kernel - Re: CFS review

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Message-ID: <20070801113759.GA12523@elte.hu>
Date:	Wed, 1 Aug 2007 13:37:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roman Zippel <zippel@...ux-m68k.org>
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


* 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

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

btw., here's the general change in size of a generic vmlinux from .22 to 
.23-git, using the same .config:

     text    data     bss     dec     hex filename
  5256628  520760 1331200 7108588  6c77ec vmlinux.22
  5306918  535844 1327104 7169866  6d674a vmlinux.23-git

+50K. (this was on UP)

In any case, there's still some debugging code in the scheduler (beyond 
SCHED_DEBUG), i'll work some more on reducing it.

	Ingo
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