From: Paul E. McKenney <paulmck@kernel.org>
Date: Thu, 7 May 2020 23:36:10 +0000 (-0700)
Subject: rcu: No-CBs-related sleeps to idle priority
X-Git-Tag: howlett/maple_spf/20210104~1405^2^2^2~14
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f5ca34643bbd84f514bdeee194c45dd1fb066ef2;p=users%2Fjedix%2Flinux-maple.git

rcu: No-CBs-related sleeps to idle priority

This commit converts the schedule_timeout_interruptible() call used by
RCU's no-CBs grace-period kthreads to schedule_timeout_idle().  This
conversion avoids polluting the load-average with RCU-related sleeping.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 25296c17a30df..982fc5be52698 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2005,7 +2005,7 @@ static void nocb_gp_wait(struct rcu_data *my_rdp)
 		/* Polling, so trace if first poll in the series. */
 		if (gotcbs)
 			trace_rcu_nocb_wake(rcu_state.name, cpu, TPS("Poll"));
-		schedule_timeout_interruptible(1);
+		schedule_timeout_idle(1);
 	} else if (!needwait_gp) {
 		/* Wait for callbacks to appear. */
 		trace_rcu_nocb_wake(rcu_state.name, cpu, TPS("Sleep"));