Date:	Sat, 21 Jun 2008 03:18:19 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Kevin Winchester" <kjwinchester@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Ingo Molnar" <mingo@...hat.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, "Pavel Machek" <pavel@....cz>
Subject: Re: Bisecting tip/auto-x86-next?

On Sat, Jun 21, 2008 at 3:00 AM, Kevin Winchester
<kjwinchester@...il.com> wrote:
> Yinghai Lu wrote:
>>
>> On Fri, Jun 20, 2008 at 5:00 PM, Kevin Winchester
>> <kjwinchester@...il.com> wrote:
>>>
>>> Ingo Molnar wrote:
>>>>
>>>> * Kevin Winchester <kjwinchester@...il.com> wrote:
>>>>
>>>>>> hm, could you send me the config that triggered this?
>>>>>
>>>>> I will do so tonight when I am home again.  It is a UP AMD64 box with a
>>>>> VIA chipset, if that helps.
>>>>>
>>>>>> btw., you can probably ignore this one safely. Also please tell me at
>>>>>> which commit ID you were at when you triggered this warning.
>>>>>
>>>>> Good to know - I will get the commit ID tonight as well, although
>>>>> wouldn't following the same bisection sequence that I did give you the
>>>>> same
>>>>> bisection point?  I guess that would assume that linus/master and
>>>>> auto-x86-next haven't changed much since last night, which might not be
>>>>> correct.
>>>>
>>>> yeah, you'd probably not hit that warning with the x86/gart bisection
>>>> sequence. (Assuming the bug is introduced in that branch - so you should
>>>> first check whether pure x86/gart kernel triggers the problem too.)
>>>>
>>>> If you still have the commit ID around then please send it - if you
>>>> dont,
>>>> no problem, it's no big issue. I wanted to check how wide the bisection
>>>> window is where the warning triggers.
>>>>
>>> I'm sorry - I accidentally checkout out x86/gart to test it before
>>> grabbing
>>> the commit ID.
>>>
>>> I went ahead with the bisection and found:
>>>
>>>
>>>
>>> 8c9fd91a0dc503f085169d44f4360be025f75224 is first bad commit
>>> commit 8c9fd91a0dc503f085169d44f4360be025f75224
>>> Author: Yinghai Lu <yhlu.kernel@...il.com>
>>> Date:   Sun Apr 13 18:42:31 2008 -0700
>>>
>>>   x86: checking aperture size order
>>>
>>>   some systems are using 32M for gart and agp when memory is less than
>>> 4G.
>>>   Kernel will reject and try to allcate another 64M that is not needed,
>>>   and we will waste 64M of perfectly good RAM.
>>>
>>>   this patch adds a workaround by checking aper_base/order between NB and
>>>   agp bridge. If they are the same, and memory size is less than 4G, it
>>>   will allow it.
>>>
>>>   Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>>>   Signed-off-by: Ingo Molnar <mingo@...e.hu>
>>>   Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>>>
>>> :040000 040000 848d6e4045a14d01fc0a794d4350d8a84f3ceff6
>>> 4a10a52b41309060cd5dc1bf0c322f6d43b2477b M      arch
>>> :040000 040000 aa1cee87b1f5b1b30ed03ce6164ad7f404fef2a3
>>> f9ce0aaa1f7d4fdc7bdc5a43285495db53a6f531 M      drivers
>>>
>>>
>>> as the first bad commit.  I do not have time to look at the patch right
>>> now,
>>> but in case anyone else does, I figured I would post it.
>>>
>>
>> please send out whole boot logs with "debug" in command line.
>>
>
> "debug" in the command line doesn't seem to have any effect on the printout
> (is there some config option I need to use with it?), but here it is anyway:

are you using tip/master?

http://people.redhat.com/mingo/sched-devel.git/README

YH
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