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

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Message-ID: <20240205082120.4144fb6f@rorschach.local.home>
Date: Mon, 5 Feb 2024 08:21:20 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Yuanhe Shu <xiangzao@...ux.alibaba.com>, Shuah Khan
 <skhan@...uxfoundation.org>
Cc: mhiramat@...nel.org, mathieu.desnoyers@...icios.com, shuah@...nel.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] selftests/ftrace: Limit length in subsystem-enable
 tests

On Mon,  5 Feb 2024 21:12:33 +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
> never stop as it cat an endless output.
> Select the first 100 lines of output would be enough to judge whether
> there are more than 3 types of sched events.

It's not that it never stops but on some slower systems it does seem to
take forever.

Acked-by: Steven Rostedt (Google) <rostedt@org>

Shuah,

Can you take this through your tree?

Thanks,

-- Steve


> 
> 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..74c1114603a7 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 | 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 | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
>  if [ $count -ne 0 ]; then
>      fail "any of scheduler events should not be recorded"
>  fi