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    SubjectRe: [PATCH] Update old Mini-HOWTO for ftrace
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    Dear steven,

    I confirm http://lkml.org/lkml/2009/3/23/24 webpage now.
    I am gratified with a similar patch that another people sent this problem.

    In fact, I figured out trivial problem of old mini-HOWTO according to
    http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.1/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide-Realtime_Specific_Tuning-Using_the_ftrace_Utility_for_Tracing_Latencies.html
    web manual.

    I want you to change MRG Kernel from ftrace to function for
    consistency in private.
    Thank you for interesting article

    Regards,
    GeunSik Lim..

    2009/4/7 Steven Rostedt <srostedt@redhat.com>:
    >
    > 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
    >
    >
    >



    --
    Regards,
    GeunSik Lim
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