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

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Date:   Thu, 8 Jun 2017 15:14:19 -0600
From:   Shuah Khan <shuahkh@....samsung.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Shuah Khan <shuah@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kselftest@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        linux-kernel@...r.kernel.org, Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH 0/7] selftests/ftrace: Some improvements of ftracetest

On 06/08/2017 03:08 PM, Steven Rostedt wrote:
> On Thu, 8 Jun 2017 14:06:23 -0600
> Shuah Khan <shuahkh@....samsung.com> wrote:
> 
>>>>>>> # of passed:  41
>>>>>>> # of failed:  1
>>>>>>> # of unresolved:  0
>>>>>>> # of untested:  0
>>>>>>> # of unsupported:  3
>>>>>>> # of xfailed:  0
>>>>>>> # of undefined(test bug):  0  
>>>
>>> I booted v4.12-rc4 with your config (didn't even have to change
>>> anything for my box), and checkout the v4.12-rc4 kernel on the test box
>>> and ran ftracetest. Here's my result:
>>>
>>> # of passed:  40
>>> # of failed:  0
>>> # of unresolved:  0
>>> # of untested:  0
>>> # of unsupported:  6
>>> # of xfailed:  0
>>> # of undefined(test bug):  0
>>>
>>> The unsupported were:
>>>
>>> [29] event trigger - test histogram modifiers	[UNSUPPORTED]
>>> [30] event trigger - test histogram trigger	[UNSUPPORTED]
>>> [31] event trigger - test multiple histogram triggers	[UNSUPPORTED]
>>>
>>> [44] (instance)  event trigger - test histogram modifiers	[UNSUPPORTED]
>>> [45] (instance)  event trigger - test histogram trigger	[UNSUPPORTED]
>>> [46] (instance)  event trigger - test multiple histogram triggers	[UNSUPPORTED]
>>>
>>> Now why is this different? What compiler are you using to build your
>>> kernel?
>>>   
>> gcc version 6.3.0 20170406 (Ubuntu 6.3.0-12ubuntu2) 
>>
>>
>> I don't see any regressions. I use this system for stable release testing
>> and haven't seen any issues. Does ftrace have a dependency on a specific
>> gcc revision?
> 
> It behaves differently with different gcc, as some support mfentry,
> while others only use mcount. gcc 6.3.0 should be using mfentry. I'm
> testing with 6.2, a build I made myself.
> 
> Just to confirm, you are running the 4.12-rc4 ftracetests on a 4.12-rc4
> kernel and getting this error? Or are you running a different version
> of ftracetest or a different version of the kernel?
> 

I am running 4.12-rc4 ftracetests on a 4.12-rc4 kernel. I did a headers
install before I built and ran kselftest.

btw tests should run on older kernels failing gracefully when feature isn't
supported and/or enabled.

So the expectation is for ftracetest to run cleanly skipping tests on older
kernels.

Would getting results for ftracetest on 4.11 with 4.11 ftracetest help you
with debug?

thanks,
-- Shuah