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ftrace: add tracepoint for timer event

From:  Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
To:  Ingo Molnar <mingo@elte.hu>
Subject:  [PATCH v3 0/4] ftrace: add tracepoint for timer event
Date:  Fri, 17 Jul 2009 18:11:18 +0800
Message-ID:  <4A604E46.5050903@cn.fujitsu.com>
Cc:  Thomas Gleixner <tglx@linutronix.de>, Steven Rostedt <rostedt@goodmis.org>, Frederic Weisbecker <fweisbec@gmail.com>, Zhaolei <zhaolei@cn.fujitsu.com>, kosaki.motohiro@jp.fujitsu.com, Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>, Anton Blanchard <anton@samba.org>, LKML <linux-kernel@vger.kernel.org>
Archive‑link:  Article

Hi,

We can monitor timer's lifecycle and behaviors by these tracepoint. 

Following tracepoints are introduced as ingo's suggestion in
	http://marc.info/?l=linux-kernel&m=123791899529128&...

for timer:
trace_timer_init()
trace_timer_start()
trace_timer_expire()
trace_timer_cancel()

for hrtimer:
trace_hrtimer_init()
trace_hrtimer_start()
trace_hrtimer_expire()
trace_hrtimer_cancel()

for itimer:
itimer_state
itimer_expire()

Changlog from latest patchset:
1: ours patches are base on Anton Blanchard's patch which can been found
   at:
   	http://marc.info/?l=linux-kernel&m=124331396919301&...
   but this patch is can't apply on Ingo's tip tree, so we rebase this
   patch against latest tip tree

2: fix those patches address Thomas's comment
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