linux-kernel - Re: [PATCH v2 19/32] selftests/ftrace: Add a testcase for nop tracer

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Message-Id: <20180826163020.acae9d2772fa6d7de005b83d@kernel.org>
Date:   Sun, 26 Aug 2018 16:30:20 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.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 19/32] selftests/ftrace: Add a testcase for nop
 tracer

On Fri, 24 Aug 2018 18:53:42 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Fri, 17 Aug 2018 01:38:09 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > Add a testcase for nop tracer. This tracer has 2 test
> > options, so check it too.
> > 
> 
> I'd rather not include this. In fact, I'd love to get rid of the nop
> options. They were added to make sure options worked when we first
> added them. They are actually pointless.

Got it. I was thinking it was an odd option when I was writing a test. :)

> The only point of this test is to know if options work or not. Hmm, I
> guess that is something that could possibly be valuable :-/

Actually setting "nop" is already done in basic testcase. So I think
we can just drop this test.


Thank you,
 
> -- Steve
> 
> 
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> > ---
> >  .../testing/selftests/ftrace/test.d/tracer/nop.tc  |   22 ++++++++++++++++++++
> >  1 file changed, 22 insertions(+)
> >  create mode 100644 tools/testing/selftests/ftrace/test.d/tracer/nop.tc
> > 
> > diff --git a/tools/testing/selftests/ftrace/test.d/tracer/nop.tc b/tools/testing/selftests/ftrace/test.d/tracer/nop.tc
> > new file mode 100644
> > index 000000000000..ca63e316e0f5
> > --- /dev/null
> > +++ b/tools/testing/selftests/ftrace/test.d/tracer/nop.tc
> > @@ -0,0 +1,22 @@
> > +#!/bin/sh
> > +# SPDX-License-Identifier: GPL-2.0
> > +# description: Test nop tracer
> > +
> > +# nop must be supported always
> > +grep -q "nop" available_tracers
> > +
> > +echo "nop" > current_tracer
> > +
> > +# nop provides 2 test options
> > +grep -q "test_nop_accept" trace_options
> > +grep -q "test_nop_refuse" trace_options
> > +
> > +# nop_accept always success
> > +echo "test_nop_accept" > trace_options
> > +echo "notest_nop_accept" > trace_options
> > +
> > +# nop_refuse always failed
> > +! echo "test_nop_refuse" > trace_options
> > +! echo "notest_nop_refuse" > trace_options
> > +
> > +exit 0
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>