linux-kernel - Re: [patch] CFS scheduler, -v12

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Date:	Thu, 31 May 2007 11:49:56 +1000
From:	Peter Williams <pwil3058@...pond.net.au>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, Nick Piggin <nickpiggin@...oo.com.au>,
	Con Kolivas <kernel@...ivas.org>,
	Christoph Lameter <clameter@....com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch] CFS scheduler, -v12

Siddha, Suresh B wrote:
> On Tue, May 29, 2007 at 07:18:18PM -0700, Peter Williams wrote:
>> Siddha, Suresh B wrote:
>>> I can try 32-bit kernel to check.
>> Don't bother.  I just checked 2.6.22-rc3 and the problem is not present
>> which means something between rc2 and rc3 has fixed the problem.  I hate
>> it when problems (appear to) fix themselves as it usually means they're
>> just hiding.
>>
>> I didn't see any patches between rc2 and rc3 that were likely to have
>> fixed this (but doesn't mean there wasn't one).  I'm wondering whether I
>> should do a git bisect to see if I can find where it got fixed?
>>
>> Could you see if you can reproduce it on 2.6.22-rc2?
> 
> No. Just tried 2.6.22-rc2 64-bit version at runlevel 3 on my remote
> system at office. 15 attempts didn't show the issue.
> 
> Sure that nothing changed in your test setup?
> 
> More experiments tomorrow morning..

I've finished bisecting and the patch at which things appear to improve 
is cd5477911fc9f5cc64678e2b95cdd606c59a11b5 which is in the middle of a 
bunch of patches reorganizing the link phase of the build.  Patch 
description is:

kbuild: add "Section mismatch" warning whitelist for powerpc
author	Li Yang <leoli@...escale.com>
	Mon, 14 May 2007 10:04:28 +0000 (18:04 +0800)
committer	Sam Ravnborg <sam@...nborg.org>
	Sat, 19 May 2007 07:11:57 +0000 (09:11 +0200)
commit	cd5477911fc9f5cc64678e2b95cdd606c59a11b5
tree	d893f07b0040d36dfc60040dc695384e9afcf103	tree | snapshot
parent	f892b7d480eec809a5dfbd6e65742b3f3155e50e	commit | diff
kbuild: add "Section mismatch" warning whitelist for powerpc

This patch fixes the following class of "Section mismatch" warnings when
building powerpc platforms.

WARNING: arch/powerpc/kernel/built-in.o - Section mismatch: reference to 
.init.data:.got2 from prom_entry (offset 0x0)
WARNING: arch/powerpc/platforms/built-in.o - Section mismatch: reference 
to .init.text:mpc8313_rdb_probe from .machine.desc after 
'mach_mpc8313_rdb' (at offset 0x4)
....

Signed-off-by: Li Yang <leoli@...escale.com>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>

scripts/mod/modpost.c

Peter
-- 
Peter Williams                                   pwil3058@...pond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce
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