linux-kernel - Re: [PATCH V1 01/13] selftests/resctrl: Fix feature detection

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Date:   Wed, 11 Mar 2020 11:45:56 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Cc:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "Luck, Tony" <tony.luck@...el.com>,
        "babu.moger@....com" <babu.moger@....com>,
        "james.morse@....com" <james.morse@....com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V1 01/13] selftests/resctrl: Fix feature detection

Hi Sai,

On 3/11/2020 11:22 AM, Sai Praneeth Prakhya wrote:
> Hi Reinette,
> 
> On Wed, 2020-03-11 at 11:06 -0700, Reinette Chatre wrote:
>> Hi Sai,
>>
>> On 3/9/2020 3:51 PM, Prakhya, Sai Praneeth wrote:
>>>> -----Original Message-----
>>>> From: Reinette Chatre <reinette.chatre@...el.com>
>>>> Sent: Monday, March 9, 2020 3:34 PM
>>>
>>> [SNIP]
>>>
>>>>> That's a good point and makes sense to me. I think we could fix it in
>>>>> two ways 1. grep for strings in dmesg but that will still leave
>>>>> ambiguity in deciding b/w mbm and cqm because kernel prints "resctrl:
>>>>> L3
>>>> monitoring detected" for both the features 2. Check in "info" directory
>>>>> 	a. For cat_l3, we could search for info/L3
>>>>> 	b. For mba, we could search for info/MB
>>>>> 	c. For cqm and mbm, we could search for specified string in
>>>>> info/L3_MON/mon_features
>>>>>
>>>>> I think option 2 might be better because it can handle all cases,
>>>>> please let me
>>>> know what you think.
>>>>
>>>> I agree. For the reasons you mention and also that (1) may not be
>>>> possible if the
>>>> loglevel prevents those lines from being printed.
>>>
>>> Makes sense. I will work on the fix.
>>
>> One more note about this ... from what I can tell the test for a feature
>> currently fails if the platform does not support the feature. Would it
>> be possible to just skip the test in this case instead?
> 
> That's because the output of the test should be just "ok" or "not ok".

The output could be something like:

ok MBA # SKIP MBA is not supported

> I can change it to something like "# Skip <test_name> because platform doesn't
> support the feature", but not really sure if it complies with TAP 13 protocol.

Please consider the "skip" directive at
https://testanything.org/tap-version-13-specification.html

Reinette