I tried bringing this up on the irc channel, but nobody took the bait. Hopefully this will generate some discussion.
I just filed bug 1485631. Nikola suggested one way of handling it, but there are some complications that I thought I should highlight so we're all on the same page.
The basic question is, if a host has X CPUs in total for VMs, and a single instance wants X+1 vCPUs, should we allow it? (Regardless of overcommit ratio.) There is also an equivalent question for RAM.
Currently we have two different answers depending on whether numa topology is involved or not. Should we change one of them to make it consistent with the other? If so, a) which one should we change, and b) how would we do that given that it results in a user-visible behaviour change? (Maybe a microversion, even though the actual API doesn't change, just whether the request passes the scheduler filter or not?)
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