Maciek Sarnowicz b7d5bf9cb6 Migrations for VmHostSlice. ...

We'll put VMs in systemd slices. This change adds the migrations to
enable that.

Each slice reserves a subset of host's cpus & part of its memory. Then,
VMs can be allocated into the slice. `allowed_cpus` column maps directly
to the `AllowedCPUs` property of the corresponding systemd slice.

`total_memory_gib` & `used_memory_gib` are used to make sure that we
will have enough memory in the host for the VMs that'll be added to the
slice in future. When a VmHostSlice record is allocated, it will reserve
`total_memory_gib` from the host.

Each slice can be either be `dedicated` or `shared`, as specified in the
`type` column. We will use `shared` slices to host burstable instances.

2025-01-13 00:23:07 -08:00

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