linux-kernel - Re: [PATCH] kselftests: ftrace: limit the executing time by reading from cached trace

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Date:   Wed, 20 Oct 2021 10:16:59 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Li Zhijian <lizhijian@...fujitsu.com>, <mingo@...hat.com>,
        <shuah@...nel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Philip Li <philip.li@...el.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] kselftests: ftrace: limit the executing time by reading
 from cached trace

On Wed, 20 Oct 2021 11:55:22 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> --- a/tools/testing/selftests/ftrace/test.d/functions
> +++ b/tools/testing/selftests/ftrace/test.d/functions
> @@ -124,6 +124,12 @@ initialize_ftrace() { # Reset ftrace to initial-state
>      [ -f uprobe_events ] && echo > uprobe_events
>      [ -f synthetic_events ] && echo > synthetic_events
>      [ -f snapshot ] && echo 0 > snapshot
> +
> +# Stop tracing while reading the trace file by default, to prevent
> +# the test results while checking it and to avoid taking a long time
> +# to check the result.
> +    [ -f options/pause-on-trace ] && echo 1 > options/pause-on-trace
> +

Is there a way we can save the previous setting and put it back on reset?

-- Steve