From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ingo Molnar <mingo@elte.hu>
Subject: Re: v2.6.20-rt1, yum/rpm
Date: Mon, 5 Feb 2007 11:22:49 +0100
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Cc: Sunil Naidu <akula2.shark@gmail.com>, linux-kernel@vger.kernel.org,
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To: Peter Zijlstra <a.p.zijlstra@chello.nl>
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* Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

> > But here is an interesting dmesg:
> > 
> > rcu_boost_dat: idx=1 b=0 ul=0 ub=0 boost: a=0 b=0
> > rcu_boost_dat block:    0  0  0  0?
> > rcu_boost_dat boost:    0! 0  0  0?
> > rcu_boost_dat unlock:   0? 0  0  0?
> > 
> > I didn'tunderstand this with ? Am I missing anything here or please
> > give some inputs.
> 
> That is Paul McKenney's RCU priority boosting stuff.

yeah, those messages are diagnostic. You can turn them off by disabling 
CONFIG_PREEMPT_RCU_BOOST_STATS.

	Ingo