linux-kernel - [PATCH 3/7] rcu: trace_rcu

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Date:   Tue, 15 Oct 2019 10:28:45 +0000
From:   Lai Jiangshan <laijs@...ux.alibaba.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org
Subject: [PATCH 3/7] rcu: trace_rcu_utilization() paired

The notations include "Start" and "End", it is better
when there are paired.

Signed-off-by: Lai Jiangshan <jiangshanlai@...il.com>
Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 kernel/rcu/tree.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index c351fc280945..7830d5a06e69 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2484,8 +2484,8 @@ static void rcu_cpu_kthread(unsigned int cpu)
 	char work, *workp = this_cpu_ptr(&rcu_data.rcu_cpu_has_work);
 	int spincnt;
 
+	trace_rcu_utilization(TPS("Start CPU kthread@..._run"));
 	for (spincnt = 0; spincnt < 10; spincnt++) {
-		trace_rcu_utilization(TPS("Start CPU kthread@..._run"));
 		local_bh_disable();
 		*statusp = RCU_KTHREAD_RUNNING;
 		local_irq_disable();
@@ -2501,6 +2501,7 @@ static void rcu_cpu_kthread(unsigned int cpu)
 			return;
 		}
 	}
+	trace_rcu_utilization(TPS("End CPU kthread@..._run"));
 	*statusp = RCU_KTHREAD_YIELDING;
 	trace_rcu_utilization(TPS("Start CPU kthread@..._yield"));
 	schedule_timeout_interruptible(2);
-- 
2.20.1