linux-kernel - [PATCH tip/core/rcu 0/6] rcu: fix synchronize_rcu

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Date:	Wed, 14 Oct 2009 10:15:17 -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,
	josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com, npiggin@...e.de,
	jens.axboe@...cle.com
Subject: [PATCH tip/core/rcu 0/6] rcu: fix synchronize_rcu_expedited(),
	update docs, improve perf

This patchset contains a bug fix, a performance improvement, and
documentation updates:

o	Update Documentation/RCU/trace.txt to reflect recent changes
	(including the removal of rcupreempt.c).

o	Fix to the severe performance problem with excessive IPIs and
	lock contention in presence of very large (but legal) numbers
	of RCU callbacks (reported by Nick Piggin).

o	Stopgap fix for a bug in TREE_PREEMPT_RCU's implementation of
	synchronize_rcu_expedited().  This fix is correct, but no faster
	than synchronize_rcu().

o	Add exports for the updated synchronize_rcu_expedited()
	implementation, which moved from a static inline in
	include/linux/rcupdate.h to a separately compiled function
	in kernel/rcutree_plugin.h.

o	Add the new rnp->blocked_tasks field to the rcuhier trace file
	in debugfs.

o	Update the Documentation/RCU/trace.txt documentation to include
	the rnp->blocked_tasks tracing.

I believe that this is 2.6.32 material.

 Documentation/RCU/trace.txt   |   22 ++-
 b/Documentation/RCU/trace.txt |  232 +++++-------------------------------------
 b/include/linux/rcutree.h     |    6 -
 b/kernel/rcutree.c            |   29 ++++-
 b/kernel/rcutree.h            |    5 
 b/kernel/rcutree_plugin.h     |   20 +++
 b/kernel/rcutree_trace.c      |    8 -
 kernel/rcutree_plugin.h       |    3 
 8 files changed, 103 insertions(+), 222 deletions(-)
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