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

[Petr Vorel]

Hi Krzysztof,

> 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).

Good to know. Does it mean we should check number of processors?

But even there were just these two and no additional change to
tst_virt_hyperv(), we'd prefer to have them in test.sh and tst_test.sh.
Could you please send v2, where you implement that?

Kind regards,
Petr

> Best regards,
> Krzysztof