linux-kernel - Re: [PATCH v2 29/32] selftests/ftrace: Add wakeup

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Date:   Fri, 24 Aug 2018 22:09:49 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 29/32] selftests/ftrace: Add wakeup_rt tracer
 testcase

On Fri, 17 Aug 2018 01:42:52 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Add a testcase for wakeup_rt tracer. This requires chrt
> command to test.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  .../selftests/ftrace/test.d/tracer/wakeup_rt.tc    |   25 ++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/tracer/wakeup_rt.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/tracer/wakeup_rt.tc b/tools/testing/selftests/ftrace/test.d/tracer/wakeup_rt.tc
> new file mode 100644
> index 000000000000..3f279072ec2d
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/tracer/wakeup_rt.tc
> @@ -0,0 +1,25 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL2.0
> +# description: Test wakeup RT tracer
> +
> +if ! which nice ; then
> +  echo "chrt is not found. This test requires chrt command."
> +  exit_unresolved
> +fi
> +
> +if ! grep -wq "wakeup_rt" available_tracers ; then
> +  echo "wakeup_rt tracer is not supported"
> +  exit_unsupported
> +fi
> +
> +echo wakeup > current_tracer

I think you meant "echo wakeup_rt" ;-)

-- Steve

> +echo 1 > tracing_on
> +echo 0 > tracing_max_latency
> +
> +: "Wakeup a realtime task"
> +chrt -f 5 sleep 1
> +
> +echo 0 > tracing_on
> +grep "+ \[[[:digit:]]*\]" trace
> +grep "==> \[[[:digit:]]*\]" trace
> +