[LTP] [PATCH] controllers/cpuset_hotplug: skip unsupported Microsoft Hyper-V

[Krzysztof Kozlowski]

On 23/06/2021 11:35, Krzysztof Kozlowski wrote:
> On 23/06/2021 11:25, Petr Vorel wrote:
>> Hi Krzysztof,
>>
>>> Microsoft Hyper-V with Linux guests does not support CPU hotplug, even
>>> if enabled in kernel configuration.  Quoting Ubuntu bug report from
>>> June 2018: "While Hyper-V may present all potential CPUs via ACPI MADT,
>>> CPU add/remove is not supported.". [1]
>>
>> Reviewed-by: Petr Vorel <pvorel@suse.cz>
>>
>> LGTM. How many of tests will need tst_virt_hyperv? Although we don't touch
>> legacy API, I'd make an exception and add it to both test.sh and tst_test.sh
>> (ideally with an API extension, i.e. test could use SKIP_VIRT="hyperv", but that
>> can wait till tests are converted).
> 
> Around CPU hotplug that would be the last one I did not spot so far
> other failures but I also do not track all failures in nice way. Rather
> fixing them ad-hoc...

I just checked more and there are additional failures on Azure/HyperV
with more nodes: cpuset_load_balance, cpuset_memory_pressure,
cpuset_memory_spread and cpuset_sched_domains. These did not appear on
smaller instances (e.g. 4 CPUs).

Best regards,
Krzysztof