commit b3dbec76e5334fbb063987dea14e7b255602d7e4
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> Mon Jun 18 18:36:08 2012 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> Sun Sep 23 07:41:52 2012 -0700
tree 5b75e737856baf09b2303bebf7d9893b8279c84e
parent a10d206ef1a83121ab7430cb196e0376a7145b22

rcu: Move RCU grace-period initialization into a kthread

As the first step towards allowing grace-period initialization to be
preemptible, this commit moves the RCU grace-period initialization
into its own kthread.  This is needed to keep large-system scheduling
latency at reasonable levels.

Also change raw_spin_lock_irqsave() to raw_spin_lock_irq() as suggested
by Peter Zijlstra in review comments.

Reported-by: Mike Galbraith <mgalbraith@suse.de>
Reported-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>