7eb4f082da
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.
32 lines
1.2 KiB
Ruby
32 lines
1.2 KiB
Ruby
# frozen_string_literal: true
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Sequel.migration do
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change do
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create_table(:vm_host_slice) do
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column :id, :uuid, primary_key: true
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column :name, :text, null: false
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column :enabled, :bool, default: false, null: false
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column :is_shared, :bool, default: false, null: false
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column :cores, Integer, null: false
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column :total_cpu_percent, Integer, null: false
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column :used_cpu_percent, Integer, null: false
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column :total_memory_gib, Integer, null: false
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column :used_memory_gib, Integer, null: false
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column :family, :text, null: false
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column :created_at, :timestamptz, null: false, default: Sequel::CURRENT_TIMESTAMP
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foreign_key :vm_host_id, :vm_host, type: :uuid, null: false
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# Enforce the CPU and memory calculation logic
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constraint(:cores_not_negative) { cores >= 0 }
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constraint(:used_cpu_not_negative) { used_cpu_percent >= 0 }
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constraint(:cpu_allocation_limit) { used_cpu_percent <= total_cpu_percent }
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constraint(:used_memory_not_negative) { used_memory_gib >= 0 }
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constraint(:memory_allocation_limit) { used_memory_gib <= total_memory_gib }
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end
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alter_table(:vm) do
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add_foreign_key :vm_host_slice_id, :vm_host_slice, type: :uuid
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end
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end
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end
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