linux-kernel - Re: [PATCH] tracing/selftests: Add tests to test histogram sym and sym-offset modifiers

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Date:   Wed, 07 Jul 2021 11:31:31 -0500
From:   Tom Zanussi <zanussi@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] tracing/selftests: Add tests to test histogram sym and
 sym-offset modifiers

On Wed, 2021-07-07 at 12:14 -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> 
> Add a test to the tracing selftests that will catch if the .sym or
> .sym-offset modifiers break in the future.
> 
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  .../ftrace/test.d/trigger/trigger-hist.tc      | 18
> ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-
> hist.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-
> hist.tc
> index 2950bfbc6fce..adae72665500 100644
> --- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
> +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
> @@ -39,6 +39,24 @@ grep "parent_comm: $COMM"
> events/sched/sched_process_fork/hist > /dev/null || \
>  
>  reset_trigger
>  
> +echo "Test histogram with sym modifier"
> +
> +echo 'hist:keys=call_site.sym' > events/kmem/kmalloc/trigger
> +for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
> +grep '{ call_site: \[[0-9a-f][0-9a-f]*\] [_a-zA-Z][_a-zA-Z]* *}'
> events/kmem/kmalloc/hist > /dev/null || \
> +    fail "sym modifier on kmalloc call_site did not work"
> +
> +reset_trigger
> +
> +echo "Test histogram with sym-offset modifier"
> +
> +echo 'hist:keys=call_site.sym-offset' > events/kmem/kmalloc/trigger
> +for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
> +grep '{ call_site: \[[0-9a-f][0-9a-f]*\] [_a-zA-Z][_a-zA-Z]*+0x[0-
> 9a-f][0-9a-f]*' events/kmem/kmalloc/hist > /dev/null || \
> +    fail "sym-offset modifier on kmalloc call_site did not work"
> +
> +reset_trigger
> +
>  echo "Test histogram with sort key"
>  
>  echo 'hist:keys=parent_pid,child_pid:sort=child_pid.ascending' >
> events/sched/sched_process_fork/trigger

Acked-by: Tom Zanussi <zanussi@...nel.org>