linux-kernel - Re: [PATCH] selftests/ftrace: event_triggers: wait longer for test_event

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Date:   Sat, 5 Nov 2022 17:52:41 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Yipeng Zou <zouyipeng@...wei.com>
Cc:     <rostedt@...dmis.org>, <shuah@...nel.org>, <rdunlap@...radead.org>,
        <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests/ftrace: event_triggers: wait longer for
 test_event_enable

Hi Yipeng,

On Fri, 4 Nov 2022 10:09:31 +0800
Yipeng Zou <zouyipeng@...wei.com> wrote:

> In some platform, the schedule event may came slowly, delay 100ms can't
> cover it.
> 
> I was notice that on my board which running in low cpu_freq,and this
> selftests allways gose fail.

This looks good to me, since this can just extend the waiting time to 1 sec.
(and most of the platforms have no effect)

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thank you!

> 
> So maybe we can check more times here to wait longer.
> 
> Fixes: 43bb45da82f9 ("selftests: ftrace: Add a selftest to test event enable/disable func trigger")
> Signed-off-by: Yipeng Zou <zouyipeng@...wei.com>
> ---
>  .../ftrace/test.d/ftrace/func_event_triggers.tc   | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc
> index 8d26d5505808..3eea2abf68f9 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc
> @@ -38,11 +38,18 @@ cnt_trace() {
>  
>  test_event_enabled() {
>      val=$1
> +    check_times=10		# wait for 10 * SLEEP_TIME at most
>  
> -    e=`cat $EVENT_ENABLE`
> -    if [ "$e" != $val ]; then
> -	fail "Expected $val but found $e"
> -    fi
> +    while [ $check_times -ne 0 ]; do
> +	e=`cat $EVENT_ENABLE`
> +	if [ "$e" == $val ]; then
> +	    return 0
> +	fi
> +	sleep $SLEEP_TIME
> +	check_times=$((check_times - 1))
> +    done
> +
> +    fail "Expected $val but found $e"
>  }
>  
>  run_enable_disable() {
> -- 
> 2.17.1
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>