linux-kernel - [PATCH 1/4] trace_event: record task' real_timer in itimer

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Date:	Tue, 15 Dec 2009 19:19:09 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] trace_event: record task' real_timer in itimer_state
 tracepoint

When itimer is ITIMER_REAL, we should cooperate with hrtimer's
tracepoit to get it's latency, this patch can let us get itimer's
hrtimer easy

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 include/trace/events/timer.h |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index 9496b96..13ec15a 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -285,6 +285,7 @@ TRACE_EVENT(itimer_state,
 
 	TP_STRUCT__entry(
 		__field(	int,		which		)
+		__field(	void *,		timer		)
 		__field(	cputime_t,	expires		)
 		__field(	long,		value_sec	)
 		__field(	long,		value_usec	)
@@ -294,6 +295,8 @@ TRACE_EVENT(itimer_state,
 
 	TP_fast_assign(
 		__entry->which		= which;
+		__entry->timer          = which == ITIMER_REAL ?
+					  &current->signal->real_timer : NULL;
 		__entry->expires	= expires;
 		__entry->value_sec	= value->it_value.tv_sec;
 		__entry->value_usec	= value->it_value.tv_usec;
@@ -301,8 +304,9 @@ TRACE_EVENT(itimer_state,
 		__entry->interval_usec	= value->it_interval.tv_usec;
 	),
 
-	TP_printk("which=%d expires=%llu it_value=%ld.%ld it_interval=%ld.%ld",
-		  __entry->which, (unsigned long long)__entry->expires,
+	TP_printk("which=%d timer=%p expires=%llu it_value=%ld.%ld it_interval="
+		  "%ld.%ld", __entry->which, __entry->timer,
+		  (unsigned long long)__entry->expires,
 		  __entry->value_sec, __entry->value_usec,
 		  __entry->interval_sec, __entry->interval_usec)
 );
-- 
1.6.1.2


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