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

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Message-ID: <20081203011042.GH6703@one.firstfloor.org>
Date:	Wed, 3 Dec 2008 02:10:42 +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 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.

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