linux-kernel - Re: Re: [PATCH v2 2/2] ftrace: Add timer-source of walltime for ftrace

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Date:	Wed, 16 Sep 2009 15:37:23 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH v2 2/2] ftrace: Add timer-source of walltime for
 ftrace

On Wed, 2009-09-16 at 14:40 +0800, Zhaolei wrote:
> Frederic Weisbecker wrote:
> > On Wed, Sep 16, 2009 at 01:29:19PM +0800, Zhaolei wrote:
> >> We can add a timer-source for ftrace to support wall-time display.
> >> It is based on Steven Rostedt <rostedt@...dmis.org>'s suggestion in:
> >> http://lkml.org/lkml/2009/7/24/103
> >>
> >> It need to applys on my patch of:
> >> [PATCH v4 1/2] Add function to convert between calendar time and broken-down time for universal use
> >>
> Hello, Frederic
> 
> Thanks for your review.
> 
> >> We can get following output:
> >>  # cd /mnt/debugfs/tracing/
> >>  # cat trace_clock
> >>  [local] global walltime
> >>  # echo sched_switch > current_tracer
> >>  # cat trace
> >>  # tracer: sched_switch
> >>  #
> >>  #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
> >>  #              | |       |          |         |
> >>              bash-3580  [000]  2916.188093:   3580:120:S   + [000]  3580:120:S bash
> >>              bash-3580  [000]  2916.188205:   3580:120:S   + [000]  3580:120:S bash
> >>              bash-3580  [000]  2916.188538:   3580:120:R   + [000]     5:115:S events/0
> >>              bash-3580  [000]  2916.188599:   3580:120:R ==> [000]     5:115:R events/0
> >>          events/0-5     [000]  2916.188669:      5:115:S ==> [000]  3580:120:R bash
> >>  ...
> >>  # echo walltime > trace_clock
> >>  # cat trace
> >>  # tracer: sched_switch
> >>  #
> >>  #           TASK-PID    CPU#           TIMESTAMP  FUNCTION
> >>  #              | |       |                        |         |
> > 
> > 
> > 
> > 
> > The headers seem a bit broken. Is it a copy paste effect or?
> 
> No, it is a format bug of patch.
> I'll fix it.
> 
> > 
> > 
> > 
> >>              bash-3580  [000] 2009-08-24 18:03:16.500705:   3580:120:S   + [000]  3580:120:S bash
> >>              bash-3580  [000] 2009-08-24 18:03:16.500815:   3580:120:S   + [000]  3580:120:S bash
> >>              bash-3580  [000] 2009-08-24 18:03:16.500815:   3580:120:S   + [000]  3580:120:S bash
> >>              bash-3580  [000] 2009-08-24 18:03:16.500815:   3580:120:S ==> [000]     5:115:R events/0
> >>          events/0-5     [000] 2009-08-24 18:03:16.500815:      5:115:R   + [000]  3578:120:S sshd
> >>  ...
> > 
> > 
> > But nice result :)
> > 
> > 
> >> Changelog:
> >> v1->v2: Rebase to top of tip tree.
> >>
> >> Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
> >> ---
> >>  include/linux/trace_clock.h |    1 +
> >>  kernel/trace/trace.c        |   24 ++++++++++++++++-----
> >>  kernel/trace/trace.h        |    8 ++++++-
> >>  kernel/trace/trace_clock.c  |   48 +++++++++++++++++++++++++++++++++++++++++++
> >>  kernel/trace/trace_output.c |   21 +++++++++++++++---
> >>  5 files changed, 91 insertions(+), 11 deletions(-)
> >>
> >> diff --git a/include/linux/trace_clock.h b/include/linux/trace_clock.h
> >> index 7a81303..322707e 100644
> >> --- a/include/linux/trace_clock.h
> >> +++ b/include/linux/trace_clock.h
> >> @@ -15,5 +15,6 @@
> >>  extern u64 notrace trace_clock_local(void);
> >>  extern u64 notrace trace_clock(void);
> >>  extern u64 notrace trace_clock_global(void);
> >> +extern u64 notrace trace_clock_walltime(void);
> >>  
> >>  #endif /* _LINUX_TRACE_CLOCK_H */
> >> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> >> index fd52a19..160b6a8 100644
> >> --- a/kernel/trace/trace.c
> >> +++ b/kernel/trace/trace.c
> >> @@ -335,9 +335,10 @@ static struct {
> >>  } trace_clocks[] = {
> >>  	{ trace_clock_local,	"local" },
> >>  	{ trace_clock_global,	"global" },
> >> +	{ trace_clock_walltime,	"walltime" },
> >>  };
> >>  
> >> -int trace_clock_id;
> >> +enum TRACE_CLOCK_TYPE trace_clock_type = TRACE_CLOCK_LOCAL;
> > 
> > 
> > 
> > Uppercase names are usually reserved for CPP macros.
> 
> I'll rename it.

After the fixes that Frederic suggested, and the required timekeeping
ACKS, I'll queue up your next version for v2.6.33. Looking forward to
your new patches.


Thanks,

-- Steve


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