linux-kernel - Re: [regression] commit 6a4f3b52 causes invalid memtype

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Message-ID: <20100705104035.GA28190@elte.hu>
Date:	Mon, 5 Jul 2010 12:40:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ali Gholami Rudi <ali@...i.ir>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	dfeng@...hat.com, x86@...nel.org, venki@...gle.com,
	tglx@...utronix.de, suresh.b.siddha@...el.com, mingo@...hat.com,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [regression] commit 6a4f3b52 causes invalid memtype


* Ali Gholami Rudi <ali@...i.ir> wrote:

> Xiaotian Feng <dfeng@...hat.com> wrote:
> > On 07/05/2010 05:28 PM, Ali Gholami Rudi wrote:
> > > Xiaotian Feng<dfeng@...hat.com>  wrote:
> > >> Could you please try following commit in -tip tree?
> > >>
> > >> commit 2463eb8b3093995e09a0d41b3d78ee0cf5fb4249
> > >> Author: Peter Zijlstra<peterz@...radead.org>
> > >> Date:   Sat May 29 15:31:43 2010 +0200
> > >>
> > >>       rbtree: Undo augmented trees performance damage
> > >
> > > Where can I get it?  I couldn't find it either in
> > > Linus' or x86 repo tip.
> > http://git.kernel.org/tip/2463eb8b3093995e09a0d41b3d78ee0cf5fb4249
> 
> It does fix it.

Hm, interesting. That's a pure performance fix - so why does it fix a 
regression?

Does Peter's augmented rbtrees improvements fix a bug too, as a side-effect? 
If yes then we need to accelerate that commit - right now it's aimed for 
v2.6.36.

Thanks,

	Ingo
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