ftrace: sched_switch plugin is deprecated

Actually, sched_switch function tracer is merged into wakeup/wakeup_rt
Update 'mini-HOWTO' for ftrace(Kernel function tracer).
If we want to trace "sched:sched_switch" to trace sched_switch func,
We may utilize event option.(e.g: trace-cmd list -e | grep sched)
This patch is based on Linux-3.3.rc2-SMP-PREEMPT

Link: http://lkml.kernel.org/r/1328695537-15081-1-git-send-email-geunsik.lim@gmail.com

Cc: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Geunsik Lim <geunsik.lim@samsung.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a3f1bc5..10d5503 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2764,12 +2764,12 @@ static const char readme_msg[] =
        "tracing mini-HOWTO:\n\n"
        "# mount -t debugfs nodev /sys/kernel/debug\n\n"
        "# cat /sys/kernel/debug/tracing/available_tracers\n"
-       "wakeup preemptirqsoff preemptoff irqsoff function sched_switch nop\n\n"
+       "wakeup wakeup_rt preemptirqsoff preemptoff irqsoff function nop\n\n"
        "# cat /sys/kernel/debug/tracing/current_tracer\n"
        "nop\n"
-       "# echo sched_switch > /sys/kernel/debug/tracing/current_tracer\n"
+       "# echo wakeup > /sys/kernel/debug/tracing/current_tracer\n"
        "# cat /sys/kernel/debug/tracing/current_tracer\n"
-       "sched_switch\n"
+       "wakeup\n"
        "# cat /sys/kernel/debug/tracing/trace_options\n"
        "noprint-parent nosym-offset nosym-addr noverbose\n"
        "# echo print-parent > /sys/kernel/debug/tracing/trace_options\n"