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Commit 1e42e83f authored by Geunsik Lim's avatar Geunsik Lim Committed by Steven Rostedt
Browse files

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: default avatarGeunsik Lim <geunsik.lim@samsung.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 76027ea8

kernel/trace/trace.c

+3 −3
Original line number Diff line number Diff line
@@ -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"