Maciek Sarnowicz 7eb4f082da Add VmHostSlice migrations. ...

We'll put VMs in cgroup slices. This change adds the migrations to
enable that. A VmHostSlice is used to track resource usage of a cgroup
slice.

Each slice reserves a subset of host's cpus & part of its memory. Then,
VMs can be allocated into the 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
`is_shared` column. We will use `shared` slices to host burstable instances.

2025-01-13 16:11:57 -08:00

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