linux-kernel - Re: [PATCH 2/3] selftests/ftrace: Pick only the first kprobe event to test

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Date:   Fri, 1 May 2020 12:20:49 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     shuah <shuah@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Li Philip <philip.li@...el.com>,
        Liu Yiding <yidingx.liu@...el.com>, skhan@...uxfoundation.org
Subject: Re: [PATCH 2/3] selftests/ftrace: Pick only the first kprobe event
 to test

On Fri, 1 May 2020 09:38:59 -0600
shuah <shuah@...nel.org> wrote:

> On 5/1/20 8:17 AM, Steven Rostedt wrote:
> > On Fri,  1 May 2020 22:37:51 +0900
> > Masami Hiramatsu <mhiramat@...nel.org> wrote:
> >   
> >> Since the kprobe/kprobe_args_type.tc reads out all event logs
> >> from the trace buffer, the test can fail if there is another
> >> fork event happens.
> >> Use head command to pick only the first kprobe event from
> >> the trace buffer to test the argument types.
> >>
> >> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> >> ---
> >>   .../ftrace/test.d/kprobe/kprobe_args_type.tc       |    2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> >> index 1bcb67dcae26..81490ecaaa92 100644
> >> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> >> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> >> @@ -38,7 +38,7 @@ for width in 64 32 16 8; do
> >>     echo 0 > events/kprobes/testprobe/enable
> >>   
> >>     : "Confirm the arguments is recorded in given types correctly"
> >> -  ARGS=`grep "testprobe" trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
> >> +  ARGS=`grep "testprobe" trace | head -n 1 | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
> >>     check_types $ARGS $width
> >>   
> >>     : "Clear event for next loop"  
> > 
> > I think I've manually added this exact change to my tests to keep it from
> > failing.
> > 
> > Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> >   
> 
> Does this conflict with:
> 
> Author: Xiao Yang <yangx.jy@...fujitsu.com>
> Date:   Tue Apr 7 14:34:19 2020 +0800
> 
>      selftests/ftrace: Check the first record for kprobe_args_type.tc
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/commit/?h=next&id=f0c0d0cf590f71b2213b29a7ded2cde3d0a1a0ba
> 
> I went into mainline yesterday in my rc4 pull request.
> 
> Exact change it appears.

Ah, then I guess we don't need this patch ;-)

-- Steve


> 
> diff --git 
> a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc 
> b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> index 1bcb67dcae26..81490ecaaa92 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> @@ -38,7 +38,7 @@ for width in 64 32 16 8; do
>     echo 0 > events/kprobes/testprobe/enable
> 
>     : "Confirm the arguments is recorded in given types correctly"
> -  ARGS=`grep "testprobe" trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) 
> arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
> +  ARGS=`grep "testprobe" trace | head -n 1 | sed -e 's/.* arg1=\(.*\) 
> arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
>     check_types $ARGS $width
> 
>     : "Clear event for next loop"
> 
> thanks,
> -- Shuah