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

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Message-ID: <20090908225349.GA19524@linux.vnet.ibm.com>
Date:	Tue, 8 Sep 2009 15:53:49 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	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, rostedt@...dmis.org
Subject: [PATCH tip/core/rcu 0/3] increase rcutorture intensity and fix a
	couple resulting bugs

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.

 b/kernel/rcutorture.c |   16 +++++++++-------
 b/kernel/rcutree.c    |    7 +++++--
 kernel/rcutree.c      |   42 ++++++++++++------------------------------
 3 files changed, 26 insertions(+), 39 deletions(-)
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