linux-kernel - Re: [PATCH] tracing/selftests: Update synthetic event selftest to use common

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Date:   Thu, 25 May 2023 10:24:08 +0800
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux trace kernel <linux-trace-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] tracing/selftests: Update synthetic event selftest to
 use common_stacktrace

On Tue, 23 May 2023 22:54:29 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> With the rename of the stacktrace field to common_stacktrace, update the
> selftests to reflect this change. Copy the current selftest to test the
> backward compatibility "stacktrace" keyword. Also the "requires" of that
> test was incorrect, so it would never actually ran before. That is fixed
> now.
> 
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>

Looks good to me.

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

Thanks,

> ---
>  .../trigger-synthetic-event-stack-legacy.tc   | 24 +++++++++++++++++++
>  .../trigger-synthetic-event-stack.tc          |  5 ++--
>  2 files changed, 26 insertions(+), 3 deletions(-)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack-legacy.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack-legacy.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack-legacy.tc
> new file mode 100644
> index 000000000000..d0cd91a93069
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack-legacy.tc
> @@ -0,0 +1,24 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +# description: event trigger - test inter-event histogram trigger trace action with dynamic string param (legacy stack)
> +# requires: set_event synthetic_events events/sched/sched_process_exec/hist "long[] stack' >> synthetic_events":README
> +
> +fail() { #msg
> +    echo $1
> +    exit_fail
> +}
> +
> +echo "Test create synthetic event with stack"
> +
> +# Test the old stacktrace keyword (for backward compatibility)
> +echo 's:wake_lat pid_t pid; u64 delta; unsigned long[] stack;' > dynamic_events
> +echo 'hist:keys=next_pid:ts=common_timestamp.usecs,st=stacktrace  if prev_state == 1||prev_state == 2' >> events/sched/sched_switch/trigger
> +echo 'hist:keys=prev_pid:delta=common_timestamp.usecs-$ts,s=$st:onmax($delta).trace(wake_lat,prev_pid,$delta,$s)' >> events/sched/sched_switch/trigger
> +echo 1 > events/synthetic/wake_lat/enable
> +sleep 1
> +
> +if ! grep -q "=>.*sched" trace; then
> +    fail "Failed to create synthetic event with stack"
> +fi
> +
> +exit 0
> diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack.tc
> index 755dbe94ccf4..8f1cc9a86a06 100644
> --- a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack.tc
> +++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack.tc
> @@ -1,7 +1,7 @@
>  #!/bin/sh
>  # SPDX-License-Identifier: GPL-2.0
>  # description: event trigger - test inter-event histogram trigger trace action with dynamic string param
> -# requires: set_event synthetic_events events/sched/sched_process_exec/hist "long[]' >> synthetic_events":README
> +# requires: set_event synthetic_events events/sched/sched_process_exec/hist "can be any field, or the special string 'common_stacktrace'":README
>  
>  fail() { #msg
>      echo $1
> @@ -10,9 +10,8 @@ fail() { #msg
>  
>  echo "Test create synthetic event with stack"
>  
> -
>  echo 's:wake_lat pid_t pid; u64 delta; unsigned long[] stack;' > dynamic_events
> -echo 'hist:keys=next_pid:ts=common_timestamp.usecs,st=stacktrace  if prev_state == 1||prev_state == 2' >> events/sched/sched_switch/trigger
> +echo 'hist:keys=next_pid:ts=common_timestamp.usecs,st=common_stacktrace  if prev_state == 1||prev_state == 2' >> events/sched/sched_switch/trigger
>  echo 'hist:keys=prev_pid:delta=common_timestamp.usecs-$ts,s=$st:onmax($delta).trace(wake_lat,prev_pid,$delta,$s)' >> events/sched/sched_switch/trigger
>  echo 1 > events/synthetic/wake_lat/enable
>  sleep 1
> -- 
> 2.39.2
> 


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