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@xxxxxxxxx>
Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
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"
;
--
Regards,
GeunSik Lim
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Attachment:
update-minihowto-ftrace.patch
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