linux-kernel - [PATCH 4/4] events: sched_stat_template saves call chains of a target task

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Date:	Mon, 26 Sep 2011 19:55:35 +0400
From:	Andrew Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	avagin@...nvz.org
Subject: [PATCH 4/4] events: sched_stat_template saves call chains of a target task

It's more useful, because

sched:sched_stat_iowait:
Before we can see that block layer notifies that i/o request completed.
Now we can see which code wanted to read/write data.

sched:sched_stat_sleep:
Before we can see that delayed_work_timer_fn wakes up a task.
Now we see where a task sleeps.

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

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index f633478..7468c7a 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -296,6 +296,7 @@ DECLARE_EVENT_CLASS(sched_stat_template,
 		__entry->delay	= delay;
 	)
 	TP_perf_assign(
+		__perf_task(tsk);
 		__perf_count(delay);
 	),
 
-- 
1.7.1

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