linux-kernel - Re: [PATCH v15 15/15] tracing: Add hist trigger action 'expected fail' test case

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Message-ID: <20190220121748.7aa83459@gandalf.local.home>
Date:   Wed, 20 Feb 2019 12:17:48 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tom Zanussi <zanussi@...nel.org>
Cc:     tglx@...utronix.de, mhiramat@...nel.org, namhyung@...nel.org,
        vedang.patel@...el.com, bigeasy@...utronix.de,
        joel@...lfernandes.org, mathieu.desnoyers@...icios.com,
        julia@...com, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org
Subject: Re: [PATCH v15 15/15] tracing: Add hist trigger action 'expected
 fail' test case

On Wed, 13 Feb 2019 17:42:55 -0600
Tom Zanussi <zanussi@...nel.org> wrote:

> From: Tom Zanussi <tom.zanussi@...ux.intel.com>
> 
> Add a test case verifying that basic action combinations fail as
> expected.
> 

Hi Tom,

This test appears to fail:

# echo 'hist:keys=comm:onmatch(sched.sched_wakeup).save(comm,prio)' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger
-bash: echo: write error: Invalid argument

# cat /sys/kernel/debug/tracing/events/sched/sched_waking/hist 

ERROR: action parsing: Handler doesn't support action: save
  Last command: keys=comm:onmatch(sched.sched_wakeup).save(comm,prio)


Is the "save" feature implemented here? It's in the README too. Should
it be removed?

-- Steve

> Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
> ---
>  .../inter-event/trigger-action-hist-xfail.tc       | 30 ++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc
> new file mode 100644
> index 000000000000..1221240f8cf6
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc
> @@ -0,0 +1,30 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +# description: event trigger - test inter-event histogram trigger expected fail actions
> +
> +fail() { #msg
> +    echo $1
> +    exit_fail
> +}
> +
> +if [ ! -f set_event ]; then
> +    echo "event tracing is not supported"
> +    exit_unsupported
> +fi
> +
> +if [ ! -f snapshot ]; then
> +    echo "snapshot is not supported"
> +    exit_unsupported
> +fi
> +
> +grep -q "snapshot()" README || exit_unsupported # version issue
> +
> +echo "Test expected snapshot action failure"
> +
> +echo 'hist:keys=comm:onmatch(sched.sched_wakeup).snapshot()' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger && exit_fail
> +
> +echo "Test expected save action failure"
> +
> +echo 'hist:keys=comm:onmatch(sched.sched_wakeup).save(comm,prio)' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger && exit_fail
> +
> +exit_xfail