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Date: Fri, 13 Aug 2004 01:01:16 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: Zwane Mwaikambo <zwane@linuxpower.ca>, Keith Owens <kaos@ocs.com.au>,
       Linus Torvalds <torvalds@osdl.org>, Pavel Machek <pavel@ucw.cz>,
       Linux Kernel <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>, Matt Mackall <mpm@selenic.com>
Subject: Re: [PATCH][2.6] Completely out of line spinlocks / i386
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On Thu, Aug 12, 2004 at 12:20:58AM -0700, William Lee Irwin III wrote:
> Okay, the results on 2.6.8-rc4 (COOL had a bit of porting, basically
> dropping the hunks associated with spin_lock_flags_string or whatever
> it is). Chose the .config largely to be vaguely deterministic, but had
> to nuke the "System is too big" check in arch/x86_64/boot/tools/build.c.
>               text    data     bss     dec     hex filename
> mainline: 20708323        6603052 1878448 29189823        1bd66bf vmlinux
> cool:     20619594        6588166 1878448 29086208        1bbd200 vmlinux
> C-func:   19969264        6583128 1878384 28430776        1b1d1b8 vmlinux
> x86-64, -O2, allyesconfig minus the following:
[...]

Most of this is consolidating preempt_count()++ and preempt_count()--
when CONFIG_PREEMPT=y. Removing CONFIG_PREEMPT from the .config yields:

              text    data     bss     dec     hex filename
mainline: 19973522        6607761 1878448 28459731        1b242d3 vmlinux
cool:     19839487        6585707 1878448 28303642        1afe11a vmlinux
C-func:   19923848        6582771 1878384 28385003        1b11eeb vmlinux


-- wli