linux-kernel - [tip:tracing/core] tracepoint: trace_sched_migrate

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Message-ID: <tip-de1d7286060430e79a1d50ad6e5fee8fe863c5f6@git.kernel.org>
Date:	Wed, 6 May 2009 12:19:54 GMT
From:	tip-bot for Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mathieu.desnoyers@...ymtl.ca,
	hpa@...or.com, mingo@...hat.com, lizf@...fujitsu.com,
	xiaoguangrong@...fujitsu.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:tracing/core] tracepoint: trace_sched_migrate_task(): remove parameter

Commit-ID:  de1d7286060430e79a1d50ad6e5fee8fe863c5f6
Gitweb:     http://git.kernel.org/tip/de1d7286060430e79a1d50ad6e5fee8fe863c5f6
Author:     Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
AuthorDate: Tue, 5 May 2009 16:49:59 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 6 May 2009 12:15:51 +0200

tracepoint: trace_sched_migrate_task(): remove parameter

The orig_cpu parameter in trace_sched_migrate_task() is not necessary,
it can be got by using task_cpu(p) in the probe.

[ Impact: micro-optimization ]

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
[ modified from Mathieu's patch. The original patch is at:
  http://marc.info/?l=linux-kernel&m=123791201716239&w=2 ]
Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc: fweisbec@...il.com
Cc: rostedt@...dmis.org
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: zhaolei@...fujitsu.com
Cc: laijs@...fujitsu.com
LKML-Reference: <49FFFDB7.1050402@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 include/trace/events/sched.h |    6 +++---
 kernel/sched.c               |    2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index ffa1cab..dd4033c 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -180,9 +180,9 @@ TRACE_EVENT(sched_switch,
  */
 TRACE_EVENT(sched_migrate_task,
 
-	TP_PROTO(struct task_struct *p, int orig_cpu, int dest_cpu),
+	TP_PROTO(struct task_struct *p, int dest_cpu),
 
-	TP_ARGS(p, orig_cpu, dest_cpu),
+	TP_ARGS(p, dest_cpu),
 
 	TP_STRUCT__entry(
 		__array(	char,	comm,	TASK_COMM_LEN	)
@@ -196,7 +196,7 @@ TRACE_EVENT(sched_migrate_task,
 		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
 		__entry->pid		= p->pid;
 		__entry->prio		= p->prio;
-		__entry->orig_cpu	= orig_cpu;
+		__entry->orig_cpu	= task_cpu(p);
 		__entry->dest_cpu	= dest_cpu;
 	),
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 9f7ffd0..9cdedbd 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1954,7 +1954,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 
 	clock_offset = old_rq->clock - new_rq->clock;
 
-	trace_sched_migrate_task(p, task_cpu(p), new_cpu);
+	trace_sched_migrate_task(p, new_cpu);
 
 #ifdef CONFIG_SCHEDSTATS
 	if (p->se.wait_start)
--
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