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

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Message-ID: <4AB0885C.4010504@cn.fujitsu.com>
Date:	Wed, 16 Sep 2009 14:40:28 +0800
From:	Zhaolei <zhaolei@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	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

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.

Thanks
Zhaolei

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