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

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Date:	Mon, 6 Apr 2009 23:17:43 +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

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
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