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

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Date:   Sun, 26 Aug 2018 20:22:00 +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 29/32] selftests/ftrace: Add wakeup_rt tracer
 testcase

On Fri, 24 Aug 2018 22:09:49 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> 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" ;-)

Oops, that's my fault....

Thanks!

> 
> -- 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
> > +
> 


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