[PATCH tip/core/rcu 0/3] Crude timer-wheel latency hacks

[Paul E. McKenney]

Hello!

The following three patches provide some crude timer-wheel latency
patches.  I understand that a more comprehensive solution is in progress,
but in the meantime, these patches work well in cases where a given
CPU has either zero or one timers pending, which is a common case for
NO_HZ_FULL kernels.  So, on the off-chance that this is helpful to
someone, the individual patches are as follows:

1.	Avoid jiffy-at-a-time stepping when the timer wheel is empty.

2.	Avoid jiffy-at-a-time stepping when the timer wheel transitions
	to empty.

3.	Avoid jiffy-at-a-time stepping after a timer is added to an
	initially empty timer wheel.

							Thanx, Paul

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

 b/kernel/timer.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

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