linux-kernel - Re: [PATCH v2] selftests/ftrace: Limit length in subsystem-enable tests

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Date: Mon, 26 Feb 2024 15:09:38 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Yuanhe Shu <xiangzao@...ux.alibaba.com>, Shuah Khan <shuah@...nel.org>
Cc: rostedt@...dmis.org, mathieu.desnoyers@...icios.com, shuah@...nel.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] selftests/ftrace: Limit length in subsystem-enable
 tests

On Mon, 26 Feb 2024 11:18:16 +0800
Yuanhe Shu <xiangzao@...ux.alibaba.com> wrote:

> While sched* events being traced and sched* events continuously happen,
> "[xx] event tracing - enable/disable with subsystem level files" would
> not stop as on some slower systems it seems to take forever.
> Select the first 100 lines of output would be enough to judge whether
> there are more than 3 types of sched events.

Looks good to me.

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

Hi Shuah, can you pick this as a fix?

Thank you,

> 
> Fixes: 815b18ea66d6 ("ftracetest: Add basic event tracing test cases")
> Cc: stable@...r.kernel.org
> Signed-off-by: Yuanhe Shu <xiangzao@...ux.alibaba.com>
> ---
>  .../selftests/ftrace/test.d/event/subsystem-enable.tc       | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> 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 b1ede6249866..b7c8f29c09a9 100644
> --- a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
> +++ b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
> @@ -18,7 +18,7 @@ echo 'sched:*' > set_event
>  
>  yield
>  
> -count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
> +count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
>  if [ $count -lt 3 ]; then
>      fail "at least fork, exec and exit events should be recorded"
>  fi
> @@ -29,7 +29,7 @@ echo 1 > events/sched/enable
>  
>  yield
>  
> -count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
> +count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
>  if [ $count -lt 3 ]; then
>      fail "at least fork, exec and exit events should be recorded"
>  fi
> @@ -40,7 +40,7 @@ echo 0 > events/sched/enable
>  
>  yield
>  
> -count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
> +count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
>  if [ $count -ne 0 ]; then
>      fail "any of scheduler events should not be recorded"
>  fi
> -- 
> 2.39.3
> 
> 


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