linux-kernel - [PATCH 1/2] sched: Some sched trace points should depend on SCHEDSTATS

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Date:	Mon, 27 Jul 2015 09:11:51 -0400
From:	yangoliver <yang_oliver@...mail.com>
To:	rostedt@...dmis.org
CC:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	Yong Yang <yangoliver@...il.com>
Subject: [PATCH 1/2] sched: Some sched trace points should depend on SCHEDSTATS

When SCHEDSTATS is not enabled, follow trace points shouldn't be
accessed by default,

	sched:sched_stat_wait
	sched:sched_stat_sleep
	sched:sched_stat_iowait
	sched:sched_stat_blocked

These trace points should only be available when SCHEDSTATS is
enabled.

Signed-off-by: Yong Yang <yangoliver@...il.com>
---
 include/trace/events/sched.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index d57a575..5b34309 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -334,6 +334,7 @@ DECLARE_EVENT_CLASS(sched_stat_template,
 );
 
 
+#ifdef CONFIG_SCHEDSTATS
 /*
  * Tracepoint for accounting wait time (time the task is runnable
  * but not actually running due to scheduler contention).
@@ -364,6 +365,7 @@ DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
 DEFINE_EVENT(sched_stat_template, sched_stat_blocked,
 	     TP_PROTO(struct task_struct *tsk, u64 delay),
 	     TP_ARGS(tsk, delay));
+#endif
 
 /*
  * Tracepoint for accounting runtime (time the task is executing
-- 
2.4.0

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