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

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Date:	Mon, 05 Jul 2010 11:38:14 +0000
From:	Ali Gholami Rudi <ali@...i.ir>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, 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

Ingo Molnar <mingo@...e.hu> wrote:
> > > >> 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.

Since the bug appears after commit 6a4f3b52, it seems to be
related to the value of memtype->subtree_max_end.  Peter's
patch seems to change the way memtype->subtree_max_end is
updated, which seems to fix the problem too.

Thanks,
Ali

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