linux-kernel - [PATCH tip/core/rcu 0/7] RCU_FAST_NO

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Message-ID: <20120608042632.GA1250@linux.vnet.ibm.com>
Date:	Thu, 7 Jun 2012 21:26:32 -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@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org
Subject: [PATCH tip/core/rcu 0/7] RCU_FAST_NO_HZ changes for 3.6

Hello!

This patch series provides more adjustments to the (relatively) new
large-system-safe implementation for RCU_FAST_NO_HZ:

1.	Remove RCU_FAST_NO_HZ dependency on stop_machine() nature of
	CPU hotplug.
2.	Make RCU_FAST_NO_HZ tracing distinguish between short and
	long idle intervals.
3.	Move RCU_FAST_NO_HZ per-CPU state variables to the rcu_dynticks
	per-CPU structure.
4.	Precompute RCU_FAST_NO_HZ timer offsets so that the timers
	will actually be paid attention to.  This fixes the slow-boot
	problem that hit a few people.
5.	Convert ftrace_dump() calls in idle entry and idle exit from
	DUMP_ALL to DUMP_ORIG.
6.	Fix erroneous TINY_PREEMPT_RCU assumption that rcu_preempt_needs_cpu()
	is a quiescent state (it is not).
7.	Round RCU_FAST_NO_HZ lazy timeout to nearest second to conserve
	power on systems with synchronized scheduler-clock interrupts.

I am considering pushing #1-#4 into 3.5 for the slow-boot regression.
If you object, please let me know.

							Thanx, Paul


 b/include/linux/rcupdate.h   |    2 
 b/include/linux/rcutiny.h    |    6 +
 b/include/linux/rcutree.h    |    2 
 b/include/trace/events/rcu.h |    1 
 b/kernel/rcutiny_plugin.h    |    2 
 b/kernel/rcutree.c           |    2 
 b/kernel/rcutree.h           |   14 +++
 b/kernel/rcutree_plugin.h    |    8 +-
 b/kernel/time/tick-sched.c   |    7 +
 kernel/rcutree.c             |    4 -
 kernel/rcutree_plugin.h      |  167 ++++++++++++++++++++++---------------------
 11 files changed, 124 insertions(+), 91 deletions(-)

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