linux-kernel - Re: kmemleak, cpu usage jump out of nowhere

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Message-ID: <4C40271E.9070809@cs.helsinki.fi>
Date:	Fri, 16 Jul 2010 12:32:14 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Zeno Davatz <zdavatz@...il.com>
CC:	Damien Wyart <damien.wyart@...e.fr>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"x86@...nel.org" <x86@...nel.org>, "mingo@...e.hu" <mingo@...e.hu>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: kmemleak, cpu usage jump out of nowhere

Hi Zeno,

Zeno Davatz wrote:
> This version has some problem with the DRM but no CPU eater yet.
> 
> http://www.flickr.com/photos/zrr/4798885756/
> 
> This version boots again just fine:
> 
> Linux zenogentoo 2.6.34-rc5-00059-gc2b4127 #105 SMP Fri Jul 16
> 11:13:21 CEST 2010 i686 Intel(R) Core(TM) i7 CPU 960 @ 3.20GHz
> GenuineIntel GNU/Linux

You're going into the wrong direction. If 2.6.34-rc7 works just fine, 
you shouldn't be testing 2.6.34-rc5.

> 
> As I understand I am bisecting upwards. Every time it does not boot
> correctly I do
> 
> git bisect bad after the next boot.

No, you should only do "git bisect bad" if you find a CPU eater and "git 
bisect good" if you don't. For the non-booting kernels you should do 
"git bisect skip"; otherwise git gets confused as we can see here.

Did you test v2.6.35-rc1? Does it have the CPU eater problem? If yes, 
please just reset your bisection

   git bisect reset
   git bisect start
   git bisect good v2.6.34-rc7
   git bisect bad v2.6.35-rc1

and use 'git bisect skip' for kernels that don't boot or build.

			Pekka
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