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Commit 28053bc7 authored by Paul E. McKenney's avatar Paul E. McKenney
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rcu: Add long-term CPU kicking 



This commit prepares for the removal of short-term CPU kicking (in a
subsequent commit).  It does so by starting to invoke resched_cpu()
for each holdout at each force-quiescent-state interval that is more
than halfway through the stall-warning interval.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 94060d22

kernel/rcu/tree.c

+6 −0
Original line number Diff line number Diff line
@@ -1225,6 +1225,12 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp, 
			 rdp->rsp->gp_start + 2 * jiffies_till_sched_qs) ||

	    ULONG_CMP_GE(jiffies, rdp->rsp->gp_start + jiffies_till_sched_qs))

		resched_cpu(rdp->cpu);  /* Force CPU into scheduler. */

	/*

	 * If more than halfway to RCU CPU stall-warning time, do

	 * a resched_cpu() to try to loosen things up a bit.

	 */

	if (jiffies - rdp->rsp->gp_start > rcu_jiffies_till_stall_check() / 2)

		resched_cpu(rdp->cpu);



	return 0;

}