linux-kernel - [PATCH tip/core/rcu 0/14] NOCBs and NO_HZ

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Message-ID: <20140828183754.GA25488@linux.vnet.ibm.com>
Date:	Thu, 28 Aug 2014 11:37:55 -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, 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,
	bobby.prani@...il.com
Subject: [PATCH tip/core/rcu 0/14] NOCBs and NO_HZ_FULL changes for 3.18

Hello!

This series includes changes affecting NOCBs and NO_HZ_FULL operation.

1.	Fix for bug in earlier patch (b58cc46c5f6b, Don't offload
	callbacks unless specifically requested) that properly handles
	early-boot callbacks.  (This bug affects unusual configurations,
	see commit log for more information.)

2.	Properly check the return value of zalloc_cpumask_var(), courtesy
	of Pranith Kumar.

3.	Use bool constant for __call_rcu_nocb() return value, courtesy
	of Pranith Kumar.

4.	Use bool constant for rcu_nocb_adopt_orphan_cbs() return value,
	courtesy of Pranith Kumar.

5.	Use bool constant for __call_rcu_nocb() return value in the case
	where callbacks are not offloaded, courtesy of Pranith Kumar.

6.	Use bool constant for rcu_nocb_adopt_orphan_cbs() return value in
	the case where callbacks are not offloaded, courtesy of Pranith
	Kumar.

7.	Aggregate RCU's kthread creation so that it is all done from a
	single early_initcall() function.

8.	Create rcuo kthreads only for CPUs that actually have come online
	at least once since boot.

9.	Check have_rcu_nocb_mask instead of for a NULL rcu_nocb_mask,
	given that this latter is not necessarily a pointer, courtesy
	of Pranith Kumar.

10.	Eliminate redundant rcu_sysidle_state variable.

11.	Don't bother tracking sysidle state if there are no nohz_full=
	CPUs in the system.

12.	Avoid misordering in __call_rcu_nocb_enqueue().

13.	Handle NOCB callbacks from irq-disabled idle code.

14.	Avoid misordering in nocb_leader_wait().

							Thanx, Paul

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

 b/include/linux/rcupdate.h |    8 +
 b/init/Kconfig             |    4 
 b/init/main.c              |    1 
 b/kernel/rcu/tree.c        |    4 
 b/kernel/rcu/tree.h        |    1 
 b/kernel/rcu/tree_plugin.h |   92 +++++++++++++++-------
 kernel/rcu/tree.c          |    3 
 kernel/rcu/tree.h          |    6 +
 kernel/rcu/tree_plugin.h   |  182 ++++++++++++++++++++++++++++++++-------------
 9 files changed, 216 insertions(+), 85 deletions(-)

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