From: Paul E. McKenney <paulmck@kernel.org>
Date: Thu, 7 May 2020 23:34:38 +0000 (-0700)
Subject: rcu: Priority-boost-related sleeps to idle priority
X-Git-Tag: howlett/maple_spf/20210104~1405^2^2^2~15
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a9352f72d6a9e8fe4840b9f0d97af8f5a6c52c79;p=users%2Fjedix%2Flinux-maple.git

rcu: Priority-boost-related sleeps to idle priority

This commit converts the long-standing schedule_timeout_interruptible()
call used by RCU's priority-boosting 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 352223664ebdc..25296c17a30df 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1033,7 +1033,7 @@ static int rcu_boost_kthread(void *arg)
 		if (spincnt > 10) {
 			WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_YIELDING);
 			trace_rcu_utilization(TPS("End boost kthread@rcu_yield"));
-			schedule_timeout_interruptible(2);
+			schedule_timeout_idle(2);
 			trace_rcu_utilization(TPS("Start boost kthread@rcu_yield"));
 			spincnt = 0;
 		}