[nova] [placement] [packaging] placement extraction check in meeting

Matt Riedemann mriedemos at gmail.com
Thu Jan 17 15:05:57 UTC 2019


On 1/17/2019 5:16 AM, Bal√°zs Gibizer wrote:
> There is a functional test [1] that uses a fake virt driver and
> simulates rehape. My first attempt was to add an extra instance
> creation after the end of the reshape. But this test reshapes the
> provider tree to a way that the resulting tree uses sharing disk
> provider and doesn't have inventory on the compute node RP any more
> (cpu and mem moved under NUMA). Unfortunately nova does not yet support
> scheduling against such tree.

That's probably the one I mentioned on the call then. It uses a fake 
virt driver but stubs out the update_provider_tree method (from what I 
remember) and wouldn't be an easy fit for doing what I think we need to 
do for a new functional test.

> 
> Shall I try to add a new functional test with the fake virt driver or
> try to add a functional test with the libvirt driver top of the VGPU
> reshaper patch?

I'm personally OK with a fake virt driver (it could even be special 
purpose like some of our fake virt drivers for testing things like live 
migration rollback and resize failure/reschedule). Writing anything on 
top of the libvirt driver is still going to require stubbing out large 
parts of the libvirt driver code, which essentially makes it a fake 
driver. I know we have some functional tests for the libvirt driver that 
stub other stuff (Stephen is familiar with these) so it might be 
possible, but if I were going to write a new test I'd just use a fake 
virt driver and have the test be more like our traditional functional 
tests where we use the API to create a server, then reshape to nested, 
and then schedule another server to the nested resource class and assert 
everything is OK, since I think what we're really trying to test here is 
the API and scheduler interaction more than the virt driver itself.

-- 

Thanks,

Matt



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