linux-kernel - Re: [RFC][PATCH 12/11] selftest/ftrace: Fix function trigger test to handle trace not disabling the tracer

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Date:   Wed, 18 Mar 2020 10:35:29 -0600
From:   Shuah Khan <shuahkhan@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Peter Wu <peter@...ensteyn.nl>,
        Jonathan Corbet <corbet@....net>,
        Tom Zanussi <zanussi@...nel.org>,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org
Subject: Re: [RFC][PATCH 12/11] selftest/ftrace: Fix function trigger test to
 handle trace not disabling the tracer

On Wed, Mar 18, 2020 at 9:13 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
>
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
>
> The ftrace selftest "ftrace - test for function traceon/off triggers"
> enables all events and reads the trace file. Now that the trace file does
> not disable tracing, and will attempt to continually read new data that is
> added, the selftest gets stuck reading the trace file. This is because the
> data added to the trace file will fill up quicker than the reading of it.
>
> By only enabling scheduling events, the read can keep up with the writes.
> Instead of enabling all events, only enable the scheduler events.
>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  .../selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc  | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

+  linux-kselttest and my LF email.

thanks,
-- Shuah