linux-kernel - [tip: core/rcu] rcu: No-CBs-related sleeps to idle priority

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Message-ID: <159618741530.4006.14529789092772976005.tip-bot2@tip-bot2>
Date:   Fri, 31 Jul 2020 09:23:35 -0000
From:   "tip-bot2 for Paul E. McKenney" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/rcu] rcu: No-CBs-related sleeps to idle priority

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     f5ca34643bbd84f514bdeee194c45dd1fb066ef2
Gitweb:        https://git.kernel.org/tip/f5ca34643bbd84f514bdeee194c45dd1fb066ef2
Author:        Paul E. McKenney <paulmck@...nel.org>
AuthorDate:    Thu, 07 May 2020 16:36:10 -07:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Mon, 29 Jun 2020 11:58:50 -07:00

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@...nel.org>
---
 kernel/rcu/tree_plugin.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 25296c1..982fc5b 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"));