* Peter Zijlstra [off-list ref] wrote:

quoted

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