linux-kernel - Re: [PATCH v2 1/2] ftrace: add tracepoint for xtime

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Date:	Wed, 16 Sep 2009 15:33:56 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>
Subject: Re: [PATCH v2 1/2] ftrace: add tracepoint for xtime

On Wed, 2009-09-16 at 13:27 +0800, Zhaolei wrote:
> From: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> 
> This patch can trace current xtime and wall_to_monotonic. Then user can
> use ctime() to convert them to wall time which is easier to be understood,
> especially for flight-recorder which need to get trace event from a kernel
> dump file.
> 
> Example of ftrace output:
>           <idle>-0     [000] 20118.489849: gtod_update_xtime: xtime=1243265589.999999824 wall_to_monotonic=3051713268.744158739
>            <...>-4020  [001] 20118.489855: sys_open(filename: bf9e66e0, flags: 98800, mode: bf9e66e0)
>            <...>-4020  [001] 20118.489873: sys_open -> 0xffffffec
> 
> ctime(1243265590) = date:Mon May 25 11:33:10 2009
> So we can realize the task with pid 4020 open a file at
> Mon May 25 11:33:10 2009
> 
> Changelog:
> v1->v2: Rebased by Zhao Lei <zhaolei@...fujitsu.com>
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
> ---
>  include/trace/events/xtime.h |   38 ++++++++++++++++++++++++++++++++++++++
>  kernel/time/ntp.c            |    4 ++++
>  kernel/time/timekeeping.c    |    6 ++++++

This patch will need an ACK from Thomas Gleixner and/or John Stultz.

-- Steve


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