linux-kernel - Re: [PATCH -tip] v9 scalable classic RCU implementation

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Message-ID: <20081219012935.GO25779@one.firstfloor.org>
Date:	Fri, 19 Dec 2008 02:29:35 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	cl@...ux-foundation.org, mingo@...e.hu, akpm@...ux-foundation.org,
	manfred@...orfullife.com, dipankar@...ibm.com,
	josht@...ux.vnet.ibm.com, schamp@....com, niv@...ibm.com,
	dvhltc@...ibm.com, ego@...ibm.com, laijs@...fujitsu.com,
	rostedt@...dmis.org, peterz@...radead.org, penberg@...helsinki.fi,
	tglx@...utronix.de
Subject: Re: [PATCH -tip] v9 scalable classic RCU implementation

On Thu, Dec 18, 2008 at 02:54:03PM -0800, Paul E. McKenney wrote:
> On Tue, Dec 02, 2008 at 05:36:59PM -0800, Paul E. McKenney wrote:
> > On Wed, Dec 03, 2008 at 02:10:42AM +0100, Andi Kleen wrote:
> > > > On Power, I see a hang in all three flavors of RCU when CPU hotplug
> > > > is enabled and dynticks is not.  I have not yet seen this hang on x86.
> > > > On Power, the hang occurs in the CPU-offline code, and is identical to
> > > > the hangs I was seeing in 2.6.27, except that "sleep 1" does not hang
> > > > in recent 2.6.28 versions.  So the timeout is apparently failing to fire
> > > > (or being ignored) for some other reason.
> > > > 
> > > > Is this similar to what you are seeing on x86?
> > > 
> > > Yes it is.
> > 
> > OK, then I will consider them to be the same bug for the moment.
> 
> Question based on some further testing over here...
> 
> Do you still get failures if you refrain from offlining CPU 0?

Yes, i never offlined cpu 0 in fact.

-Andi

-- 
ak@...ux.intel.com
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