linux-kernel - Re: [PATCH 0/7] selftests/ftrace: Some improvements of ftracetest

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Date:   Wed, 14 Jun 2017 13:53:13 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Shuah Khan <shuahkh@....samsung.com>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] selftests/ftrace: Some improvements of ftracetest

On Wed, 14 Jun 2017 11:12:17 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Hi Shuah and Steve,
> 
> Sorry for replying so late...
> 
> On Thu, 8 Jun 2017 17:51:44 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Thu, 8 Jun 2017 15:44:08 -0600
> > Shuah Khan <shuahkh@....samsung.com> wrote:
> > 
> > > > Also, did you see my reply about having the right config? You have
> > > > HIST_TRIGGERS undefined but yet the histogram trigger tests all pass in
> > > > your report.  
> > > 
> > > I did see that one. Didn't get a chance to look at that yet. Do you expect
> > > the tests to be skipped in this case? Could it be that tests aren't run?
> > > I will look at this and let you know what I find on my test system.
> > 
> > Your first email showed that they passed, which would be hard to do
> > since the feature is not even enabled. ftracetest is very much set up
> > to look at the existing pseudo files to determine if a feature exists
> > or not, and if it does not, it returns "UNSUPPORTED". If it returned
> > PASSED when the feature is not enabled, that would be a big time bug in
> > the test.
> 
> As far as I can see, what Steve you saw was my result on the 4.9 stable
> kernel, which had been compiled with fully ftrace enabled :).
> 
> > > 
> > > > 
> > > > One more thing, is this 100% reproducible. That is, does it always fail?
> > > >   
> > > Failed the two times I tried.
> 
> I've also tried to test the latest linus tree with this series with Shuah's
> config on qemu, and could not reproduced it. (I attached the log)
> As you can see, with Shuah's config, histogram tests are marked UNSUPPORTED.
> 
> Of course, that is 4.12.0-rc5+ and kconfig is a bit tweaked(attached).
> I'll try kselftest tree too.

I've tried it on linux-kselftest/next, but not able to reproduce it...

Thank you,

> 
> Thank you,
> 
> > 
> > Great to hear. I like reproducibility :-)
> > 
> > -- Steve
> > 
> 
> 
> -- 
> Masami Hiramatsu <mhiramat@...nel.org>


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