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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: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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@ -1225,6 +1225,12 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp,
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rdp->rsp->gp_start + 2 * jiffies_till_sched_qs) ||
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ULONG_CMP_GE(jiffies, rdp->rsp->gp_start + jiffies_till_sched_qs))
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resched_cpu(rdp->cpu); /* Force CPU into scheduler. */
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/*
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* If more than halfway to RCU CPU stall-warning time, do
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* a resched_cpu() to try to loosen things up a bit.
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*/
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if (jiffies - rdp->rsp->gp_start > rcu_jiffies_till_stall_check() / 2)
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resched_cpu(rdp->cpu);
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return 0;
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}
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