linux-kernel - [PATCH tip/core/rcu 12/20] rcu: Remove event tracing from rcu_cpu

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Date:	Tue,  3 Mar 2015 09:43:07 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 12/20] rcu: Remove event tracing from rcu_cpu_notify(), used by offline CPUs

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>

Offline CPUs cannot safely invoke trace events, but such CPUs do execute
within rcu_cpu_notify().  Therefore, this commit removes the trace events
from rcu_cpu_notify().  These trace events are for utilization, against
which rcu_cpu_notify() execution time should be negligible.

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b42001fd55fb..a7151d26b940 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3629,7 +3629,6 @@ static int rcu_cpu_notify(struct notifier_block *self,
 	struct rcu_node *rnp = rdp->mynode;
 	struct rcu_state *rsp;
 
-	trace_rcu_utilization(TPS("Start CPU hotplug"));
 	switch (action) {
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
@@ -3661,7 +3660,6 @@ static int rcu_cpu_notify(struct notifier_block *self,
 	default:
 		break;
 	}
-	trace_rcu_utilization(TPS("End CPU hotplug"));
 	return NOTIFY_OK;
 }
 
-- 
1.8.1.5

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