linux-kernel - [PATCH RFC tip/core/rcu 0/2] NOCB kthread economization patches

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Message-ID: <20140714100604.GA9905@linux.vnet.ibm.com>
Date:	Mon, 14 Jul 2014 03:06:04 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com,
	oleg@...hat.com, sbw@....edu, linux-rt-users@...r.kernel.org
Subject: [PATCH RFC tip/core/rcu 0/2] NOCB kthread economization patches

Hello!

This series provides a couple of patches that reduce the number of rcuo
kthreads in cases where nr_cpu_ids is larger than the actual number of
online CPUs.

1.	Preparation patch that rationalizes RCU's creation of early-boot
	kthreads.

2.	Instead of creation rcuo kthreads for each possible CPU, create
	them only for those CPUs that have come online at least once
	since boot.

							Thanx, Paul

------------------------------------------------------------------------

 b/kernel/rcu/tree.c        |    8 ++-
 b/kernel/rcu/tree.h        |    5 +-
 b/kernel/rcu/tree_plugin.h |  105 ++++++++++++++++++++++++++++++++++++---------
 3 files changed, 95 insertions(+), 23 deletions(-)

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