tree 37cf522d549037e6e31d57159d8ab7668e085715
parent 71a9b26963f8c2d0df6f782e2b29ccefc22d4fba
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1396376436 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1398786319 -0700

rcu: Bind RCU grace-period kthreads if NO_HZ_FULL

Currently, RCU binds the grace-period kthreads to the timekeeping
CPU only if CONFIG_NO_HZ_FULL_SYSIDLE=y.  This means that these
kthreads must be bound manually when CONFIG_NO_HZ_FULL_SYSIDLE=n and
CONFIG_NO_HZ_FULL=y: Otherwise, these kthreads will induce OS jitter on
random CPUs.  Given that we are trying to reduce the amount of manual
tweaking required to make CONFIG_NO_HZ_FULL=y work nicely, this commit
makes this binding happen when CONFIG_NO_HZ_FULL=y, even in cases where
CONFIG_NO_HZ_FULL_SYSIDLE=n.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>