linux-kernel - Re: [PATCH v2 26/32] selftests/ftrace: Add trace

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Date:   Fri, 24 Aug 2018 19:26:29 -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 26/32] selftests/ftrace: Add trace_pipe testcase

On Fri, 17 Aug 2018 01:41:27 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Add a simple testcase for trace_pipe which can consume
> ringbuffer.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  .../selftests/ftrace/test.d/00basic/trace_pipe.tc  |   15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/trace_pipe.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/00basic/trace_pipe.tc b/tools/testing/selftests/ftrace/test.d/00basic/trace_pipe.tc
> new file mode 100644
> index 000000000000..a7dd6fda487a
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/00basic/trace_pipe.tc
> @@ -0,0 +1,15 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +# description: trace_pipe and trace_marker

Should add:

 # flags: instance

-- Steve

> +
> +[ ! -f trace_marker ] && exit_unsupported
> +
> +echo "test input 1" > trace_marker
> +
> +: "trace interface never consume the ring buffer"
> +grep -q "test input 1" trace
> +grep -q "test input 1" trace
> +
> +: "trace interface never consume the ring buffer"
> +head -n 1 trace_pipe | grep -q "test input 1"
> +! grep -q "test input 1" trace