linux-kernel - Re: [PATCH 2/5] selftests: ftrace: Fix test cases to enable tracing

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Date:   Mon, 24 Oct 2016 15:50:27 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/5] selftests: ftrace: Fix test cases to enable tracing

On Wed, 19 Oct 2016 13:53:46 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Fix some test cases to enable tracing before starting
> trace test. This can avoid false-positive failure when
> previous testcase fails while disabling tracing.

I wonder if this would be better to do the enabling from the ftracetest
script instead. Then the tests would need to worry about it.

-- Steve


> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  .../selftests/ftrace/test.d/event/event-enable.tc  |    1 +
>  .../selftests/ftrace/test.d/event/event-pid.tc     |    1 +
>  .../ftrace/test.d/event/subsystem-enable.tc        |    1 +
>  .../ftrace/test.d/event/toplevel-enable.tc         |    1 +
>  .../ftrace/test.d/ftrace/func_profiler.tc          |    1 +
>  .../ftrace/test.d/kprobe/kprobe_ftrace.tc          |    1 +
>  6 files changed, 6 insertions(+)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/event/event-enable.tc b/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
> index 87eb9d6..ee7ea0a 100644
> --- a/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
> +++ b/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
> @@ -23,6 +23,7 @@ fi
>  
>  reset_tracer
>  do_reset
> +enable_tracing
>  
>  echo 'sched:sched_switch' > set_event
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/event/event-pid.tc b/tools/testing/selftests/ftrace/test.d/event/event-pid.tc
> index d4ab27b..1477e5e 100644
> --- a/tools/testing/selftests/ftrace/test.d/event/event-pid.tc
> +++ b/tools/testing/selftests/ftrace/test.d/event/event-pid.tc
> @@ -30,6 +30,7 @@ fi
>  
>  reset_tracer
>  do_reset
> +enable_tracing
>  
>  echo 1 > events/sched/sched_switch/enable
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
> index ced27ef..f4a64f9 100644
> --- a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
> +++ b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
> @@ -23,6 +23,7 @@ fi
>  
>  reset_tracer
>  do_reset
> +enable_tracing
>  
>  echo 'sched:*' > set_event
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
> index 0bb5df3..037a82e 100644
> --- a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
> +++ b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
> @@ -23,6 +23,7 @@ fi
>  
>  reset_tracer
>  do_reset
> +enable_tracing
>  
>  echo '*:*' > set_event
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc
> index 7808336..d10d6e0 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc
> @@ -36,6 +36,7 @@ fail() { # mesg
>  
>  echo "Testing function tracer with profiler:"
>  echo "enable function tracer"
> +enable_tracing
>  echo function > current_tracer
>  echo "enable profiler"
>  echo 1 > function_profile_enabled
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> index d6f2f49..bdbd385 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> @@ -10,6 +10,7 @@ echo _do_fork > set_ftrace_filter
>  echo 0 > events/enable
>  echo > kprobe_events
>  echo 'p:testprobe _do_fork' > kprobe_events
> +enable_tracing
>  
>  # kprobe on / ftrace off
>  echo 1 > events/kprobes/testprobe/enable