[PATCH tip/core/rcu 0/7] RCU_FAST_NO_HZ changes for 3.6

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

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(-)