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SubjectRe: [PATCH] Update old Mini-HOWTO for ftrace
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On Mon, 2009-04-06 at 23:02 +0900, GeunSik Lim wrote:
> 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@gmail.com>
> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
> Signed-off-by: Ingo Molnar <mingo@elte.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"
> ;
>

Actually Nikanth sent a similar patch a month ago, but somehow it
slipped under the radar. I'll be picking that one up instead.

http://lkml.org/lkml/2009/3/23/24

But thanks anyway.

-- Steve




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