linux-kernel - [tip:tracing/core] ftrace: clean up enable logic for sched

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Date:	Wed, 8 Apr 2009 06:55:15 GMT
From:	Zhaolei <zhaolei@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	rostedt@...dmis.org, zhaolei@...fujitsu.com, tglx@...utronix.de
Subject: [tip:tracing/core] ftrace: clean up enable logic for sched_switch

Commit-ID:  dcef788eb9659b61a2110284fcce3ca6e63480d2
Gitweb:     http://git.kernel.org/tip/dcef788eb9659b61a2110284fcce3ca6e63480d2
Author:     Zhaolei <zhaolei@...fujitsu.com>
AuthorDate: Tue, 31 Mar 2009 15:26:14 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 7 Apr 2009 14:43:09 +0200

ftrace: clean up enable logic for sched_switch

Unify sched_switch and sched_wakeup's action to following logic:
Do record_cmdline when start_cmdline_record() is called.
Start tracing events when the tracer is started.

Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
LKML-Reference: <49D1C596.5050203@...fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>


---
 kernel/trace/trace_sched_switch.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 9117cea..9d8cccd 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -29,13 +29,13 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
 	int cpu;
 	int pc;
 
-	if (!sched_ref || sched_stopped)
+	if (unlikely(!sched_ref))
 		return;
 
 	tracing_record_cmdline(prev);
 	tracing_record_cmdline(next);
 
-	if (!tracer_enabled)
+	if (!tracer_enabled || sched_stopped)
 		return;
 
 	pc = preempt_count();
@@ -56,15 +56,15 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
 	unsigned long flags;
 	int cpu, pc;
 
-	if (!likely(tracer_enabled))
+	if (unlikely(!sched_ref))
 		return;
 
-	pc = preempt_count();
 	tracing_record_cmdline(current);
 
-	if (sched_stopped)
+	if (!tracer_enabled || sched_stopped)
 		return;
 
+	pc = preempt_count();
 	local_irq_save(flags);
 	cpu = raw_smp_processor_id();
 	data = ctx_trace->data[cpu];
--
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