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

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Date: Mon, 26 Feb 2024 07:30:59 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Yuanhe Shu <xiangzao@...ux.alibaba.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, Shuah Khan
 <skhan@...uxfoundation.org>, 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 Thu, 22 Feb 2024 20:14:56 +0800
Yuanhe Shu <xiangzao@...ux.alibaba.com> wrote:

> 
> 
> 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?

Yeah, please fix that and resend. This also should have Cc: stable with Fixed: tag.

Thank you,

> 
> > 
> >>
> >> 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


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