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

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Date: Thu, 22 Feb 2024 20:14:56 +0800
From: Yuanhe Shu <xiangzao@...ux.alibaba.com>
To: Steven Rostedt <rostedt@...dmis.org>,
 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 2024/2/5 21:21, Steven Rostedt wrote:
> 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
> 

Thanks for your ack but I found that I missed the 2nd and 3rd 'trace' 
after 'head -n 100' in code. Should I resend a new patch to fix this and 
meanwhile modify commit messages according to Steve's words?

> 
>>
>> 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