Support fractional overcommit values

Author: PhilippMatthes

Makefile

@@ -117,7 +117,7 @@ check: FORCE static-check build/cover.html build-all
 
 generate: install-controller-gen
 	@printf "\e[1;36m>> controller-gen\e[0m\n"
-	@controller-gen crd rbac:roleName=manager-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases
+	@controller-gen crd:allowDangerousTypes=true rbac:roleName=manager-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases
 	@controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
 	@controller-gen applyconfiguration paths="./..."
 

api/v1/hypervisor_types.go

@@ -162,10 +162,15 @@ type HypervisorSpec struct {
 	// Overcommit specifies the desired overcommit ratio by resource type.
 	//
 	// If no overcommit is specified for a resource type, the default overcommit
-	// ratio of 1 should be applied.
+	// ratio of 1.0 should be applied, i.e. the effective capacity is the same
+	// as the actual capacity.
+	//
+	// If the overcommit ratio results in a fractional effective capacity,
+	// the effective capacity is expected to be rounded down. This allows
+	// gradually adjusting the hypervisor capacity.
 	//
 	// +kubebuilder:validation:Optional
-	Overcommit map[corev1.ResourceName]uint `json:"overcommit,omitempty"`
+	Overcommit map[corev1.ResourceName]float64 `json:"overcommit,omitempty"`
 }
 
 const (
@@ -389,6 +394,9 @@ type HypervisorStatus struct {
 	// overcommit ratio of 1 should be applied, meaning the effective capacity
 	// is the same as the actual capacity.
 	//
+	// If the overcommit ratio results in a fractional effective capacity, the
+	// effective capacity is expected to be rounded down.
+	//
 	// +kubebuilder:validation:Optional
 	EffectiveCapacity map[ResourceName]resource.Quantity `json:"effectiveCapacity,omitempty"`
 

api/v1/zz_generated.deepcopy.go

@@ -167,12 +167,17 @@ spec:
                 type: string
               overcommit:
                 additionalProperties:
-                  type: integer
+                  type: number
                 description: |-
                   Overcommit specifies the desired overcommit ratio by resource type.
 
                   If no overcommit is specified for a resource type, the default overcommit
-                  ratio of 1 should be applied.
+                  ratio of 1.0 should be applied, i.e. the effective capacity is the same
+                  as the actual capacity.
+
+                  If the overcommit ratio results in a fractional effective capacity,
+                  the effective capacity is expected to be rounded down. This allows
+                  gradually adjusting the hypervisor capacity.
                 type: object
               reboot:
                 default: false
@@ -445,6 +450,9 @@ spec:
                   In case no overcommit ratio is specified for a resource type, the default
                   overcommit ratio of 1 should be applied, meaning the effective capacity
                   is the same as the actual capacity.
+
+                  If the overcommit ratio results in a fractional effective capacity, the
+                  effective capacity is expected to be rounded down.
                 type: object
               evicted:
                 description: Evicted indicates whether the hypervisor is evicted.