linux-kernel - [PATCH] rcu: Fix incorrect trace string in rcu_boost

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Message-Id: <20230318132435.3671003-1-qiang1.zhang@intel.com>
Date:   Sat, 18 Mar 2023 21:24:35 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     paulmck@...nel.org, frederic@...nel.org, quic_neeraju@...cinc.com,
        joel@...lfernandes.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rcu: Fix incorrect trace string in rcu_boost_kthread()

Currently, the trace string information before and after rcu_wait()
and schedule_timeout_idle() are reversed, this commit therefore
switches these strings in order to correctly trace.

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/rcu/tree_plugin.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 7b0fe741a088..7b622b5196a8 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1114,10 +1114,10 @@ static int rcu_boost_kthread(void *arg)
 	trace_rcu_utilization(TPS("Start boost kthread@...t"));
 	for (;;) {
 		WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_WAITING);
-		trace_rcu_utilization(TPS("End boost kthread@..._wait"));
+		trace_rcu_utilization(TPS("Start boost kthread@..._wait"));
 		rcu_wait(READ_ONCE(rnp->boost_tasks) ||
 			 READ_ONCE(rnp->exp_tasks));
-		trace_rcu_utilization(TPS("Start boost kthread@..._wait"));
+		trace_rcu_utilization(TPS("End boost kthread@..._wait"));
 		WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_RUNNING);
 		more2boost = rcu_boost(rnp);
 		if (more2boost)
@@ -1126,9 +1126,9 @@ static int rcu_boost_kthread(void *arg)
 			spincnt = 0;
 		if (spincnt > 10) {
 			WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_YIELDING);
-			trace_rcu_utilization(TPS("End boost kthread@..._yield"));
-			schedule_timeout_idle(2);
 			trace_rcu_utilization(TPS("Start boost kthread@..._yield"));
+			schedule_timeout_idle(2);
+			trace_rcu_utilization(TPS("End boost kthread@..._yield"));
 			spincnt = 0;
 		}
 	}
-- 
2.25.1