linux-kernel - Re: [PATCH tip/core/rcu 0/3] increase rcutorture intensity and fix a couple resulting bugs

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Date:	Tue, 08 Sep 2009 19:37:30 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josht@...ux.vnet.ibm.com,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org
Subject: Re: [PATCH tip/core/rcu 0/3] increase rcutorture intensity and fix
 a couple resulting bugs

On Tue, 2009-09-08 at 15:53 -0700, Paul E. McKenney wrote:
> This patch series increases the intensity of rcutorture testing for
> TREE_PREEMPT_RCU and provides fixes for a couple resulting bugs.
> 
> o	Make rcutorture's RCU read-side critical sections occasionally
> 	spin for a few tens of milliseconds, which greatly increases
> 	the probability that they will be preempted and that quiescent
> 	states will be forced.  Yes, this does uncover some bugs in
> 	TREE_PREEMPT_RCU (though TREE_RCU passes with flying colors).
> 
> o	Fix a bug where rnp->gpnum was not being updated.  This
> 	increases TREE_PREEMPT_RCU's reliability considerably, though
> 	bugs still remain.
> 
> o	Make the initialization of multi-node trees of rcu_node
> 	structures unconditionally acquire rnp->lock.  This simplifies
> 	the code a bit and will make it easier to allow grace-period
> 	initialization become preemptable, should this be needed.
> 
> Next steps include applying review comments, adding expedited grace
> periods, and chasing down remaining bugs.  Longer term, RCU priority
> boosting.

Hi Paul,

These patches look decent to me.

If it makes you feel comfy:

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve


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