[PATCH tip/core/rcu 0/2] Callback tagging for 3.9

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

Hello!

This series contains callback-tagging patches.  These were sent earlier
in the idle/no-CBs series, but have been isolated as the more trustworthy
part of that series.

1.	Tag callback lists with the grace-period number that they are
	waiting for.  This change enables a number of optimizations
	for RCU_FAST_NO_HZ, and though it add a bit of code, it greatly
	simplifies RCU's callback handling.
2.	Trace callback acceleration (which is when RCU notices that a
	group of callbacks doesn't actually need to wait as long as it
	previously thought).

							Thanx, Paul


 b/include/trace/events/rcu.h |    6 -
 b/kernel/rcutree.c           |  201 +++++++++++++++++++++++++++++++++++++------
 b/kernel/rcutree.h           |    2 
 3 files changed, 179 insertions(+), 30 deletions(-)