linux-kernel - [PATCH 1/5] sched: event: add trace events when a task starts executing on a cpu

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Message-Id: <1338797382-287275-2-git-send-email-avagin@openvz.org>
Date:	Mon,  4 Jun 2012 12:09:38 +0400
From:	Andrew Vagin <avagin@...nvz.org>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Arun Sharma <asharma@...com>, Oleg Strikov <OSTRIKOV@...dia.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] sched: event: add trace events when a task starts executing on a cpu

sched_switch_finish is sent when a task starts executing on a cpu.
It sends in context of this task, that's why sched_switch can't be used.
sched_switch is send when a task goes out from a cpu.

This two events will be needed for profiling sleep time.

Signed-off-by: Andrew Vagin <avagin@...nvz.org>
---
 include/trace/events/sched.h |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index ea7a203..b2219d8 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -149,6 +149,25 @@ TRACE_EVENT(sched_switch,
 		__entry->next_comm, __entry->next_pid, __entry->next_prio)
 );
 
+TRACE_EVENT(sched_switch_finish,
+
+	TP_PROTO(struct task_struct *p),
+
+	TP_ARGS(p),
+
+	TP_STRUCT__entry(
+		__array(	char,	comm,	TASK_COMM_LEN	)
+		__field(	pid_t,	pid			)
+	),
+
+	TP_fast_assign(
+		__entry->pid	= p->pid;
+		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
+	),
+
+	TP_printk("comm=%s pid=%d", __entry->comm, __entry->pid)
+);
+
 /*
  * Tracepoint for a task being migrated:
  */
-- 
1.7.1

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