linux-kernel - Re: [PATCH] Update old Mini-HOWTO for ftrace

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Date:	Tue, 7 Apr 2009 08:09:50 +0900
From:	GeunSik Lim <leemgs1@...il.com>
To:	Steven Rostedt <srostedt@...hat.com>, Ingo Molnar <mingo@...e.hu>
Cc:	rt-users <linux-rt-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Update old Mini-HOWTO for ftrace

Sorry,
I mistake because I don't understand how to submit patch exactly.
I just appended below "singned-off" contents for convenience.
Sorry again.

   Signed-off-by: GeunSik Lim <leemgs1@...il.com>
   Signed-off-by: Steven Rostedt <srostedt@...hat.com>
   Signed-off-by: Ingo Molnar <mingo@...e.hu>

2009/4/6 GeunSik Lim <leemgs1@...il.com>:
> I attached patch file again because no-operation is changed
> from "none"word to "nop" word.
>
> for example,
> -       "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n"
> +       "wakeup preemptirqsoff preemptoff irqsoff function sched_switch nop\n\n"
>
> ./trace_nop.c:struct tracer nop_trace __read_mostly =
>        .name   = "nop",
>        .init           = nop_trace_init,
>        .reset  = nop_trace_reset,
>        .selftest       = trace_selftest_startup_nop,
>        .flags  = &nop_flags,
>        .set_flag       = nop_set_flag
>
>
>
> 2009/4/6 GeunSik Lim <leemgs1@...il.com>:
>>   Dear Steven,
>>
>>   The author of ftrace(Internal kernel Function Tracer) feature
>> renamed the ftrace tracer
>>    to function to avoid further confusion between the ftrace
>> infrastructure and the
>>    function tracer on Oct-20, 2008.
>>
>>    But, Update of Mini-HOWTO document are still not working
>>    .
>>    Most of the developers often utilize "/debug/tracing/README" file
>> as Mini-HOWTO.
>>    They will confuse definition and usage about ftrace  between
>> README(ftrace) file
>>    and available_tracers(function) file after linux-2.6.27 like me.
>>    And, I want you to append "chrt -f 5 sleep 1" command as simple
>> example for latency.
>>
>>    Signed-off-by: GeunSik Lim <leemgs1@...il.com>
>>    Signed-off-by: Steven Rostedt <srostedt@...hat.com>
>>    Signed-off-by: Ingo Molnar <mingo@...e.hu>
>> ---
>>  kernel/trace/trace.c |    3 ++-
>>  1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
>> index a0174a4..15f0eec 100644
>> --- a/kernel/trace/trace.c
>> +++ b/kernel/trace/trace.c
>> @@ -2358,7 +2358,7 @@ static const char readme_msg[] =
>>        "# mkdir /debug\n"
>>        "# mount -t debugfs nodev /debug\n\n"
>>        "# cat /debug/tracing/available_tracers\n"
>> -       "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n"
>> +       "wakeup preemptirqsoff preemptoff irqsoff function
>> sched_switch none\n\n"
>>        "# cat /debug/tracing/current_tracer\n"
>>        "none\n"
>>        "# echo sched_switch > /debug/tracing/current_tracer\n"
>> @@ -2368,6 +2368,7 @@ static const char readme_msg[] =
>>        "noprint-parent nosym-offset nosym-addr noverbose\n"
>>        "# echo print-parent > /debug/tracing/trace_options\n"
>>        "# echo 1 > /debug/tracing/tracing_enabled\n"
>> +       "# chrt -f 5 sleep 1\n"
>>        "# cat /debug/tracing/trace > /tmp/trace.txt\n"
>>        "echo 0 > /debug/tracing/tracing_enabled\n"
>>  ;
>>
>>
>>
>> --
>> Regards,
>> GeunSik Lim
>> --
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>>
>
>
>
> --
> Regards,
> GeunSik Lim
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>



-- 
Regards,
GeunSik Lim
--
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