Author: GeunSik Lim Date: Mon Apr 6 22:48:16 2009 +0900 [PATCH] Update Mini-HOWTO for ftrace 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 Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- 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" ;