Commit-ID: 28053bc72c0e588c577557ce9e95a6cb65078471 Gitweb: http://git.kernel.org/tip/28053bc72c0e588c577557ce9e95a6cb65078471 Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> AuthorDate: Thu, 1 Dec 2016 11:31:31 -0800 Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> CommitDate: Mon, 23 Jan 2017 11:33:02 -0800 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@xxxxxxxxxxxxxxxxxx> Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx> --- kernel/rcu/tree.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 83bf054e..0e61b62 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -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; } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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