linux-kernel - Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-ID: <Pine.LNX.4.64.0809181050040.1034@wrl-59.cs.helsinki.fi>
Date:	Thu, 18 Sep 2008 10:58:45 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Mike Galbraith <efault@....de>
cc:	Ingo Molnar <mingo@...e.hu>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-testers@...r.kernel.org
Subject: Re: [Bug #11308] tbench regression on each kernel release	from	2.6.22
 -&gt; 2.6.28

On Thu, 18 Sep 2008, Mike Galbraith wrote:

> On Thu, 2008-09-18 at 09:12 +0200, Mike Galbraith wrote:
> 
> > 1e65e841bb5584136ed6047c55cf77532afbbb55 is first bad commit
> > commit 1e65e841bb5584136ed6047c55cf77532afbbb55
> > Author: Mike Galbraith <efault@....de>
> > Date:   Wed Sep 17 14:55:50 2008 +0200
> > 
> >     Revert "Revert "block: export "ro" attribute""
> > 
> >     This reverts commit 2c8803af5c1bf41200167f29349f7f1396683a51.
> 
> BTW, the reason it's revert revert is that I reverse bisected the revert
> tree yesterday, and it emitted the same darn result.  I immediately said
> "yeah right, ya screwed up", and created the revert revert tree to make
> sure I couldn't fumble negation.

:-)

gcc compiling something slightly differently would be a nice theory but 
it sort of breaks down now as this commit touches only one .c file...
In the past when I did some static inline .h -> .c uninline sizing tests
I noticed that some changes happened also in places which should have been 
quite much unrelated. Though all the changes were minor anyway (in the 
places I did look), e.g., routed the conditional paths slightly 
differently and added one xor clear reg.

-- 
 i.
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