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rcu: Move RCU grace-period cleanup into kthread
As a first step towards allowing grace-period cleanup to be preemptible, this commit moves the RCU grace-period cleanup into the same kthread that is now used to initialize grace periods. This is needed to keep scheduling latency down to a dull roar. [ paulmck: Get rid of stray spin_lock_irqsave() calls. ] 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>
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Paul E. McKenney
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Sep 23, 2012
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