koord-manager: support manually configured default cpu normalization …

…settings

In some dedicated clusters, we don't need complex CPU models;
instead, we prefer manually configured default CPU normalization settings for greater flexibility.

Signed-off-by: yangfeiyu <yangfeiyu20102011@163.com>

apis/configuration/slo_controller_config.go

@@ -275,6 +275,8 @@ type CPUNormalizationStrategy struct {
 	// Enable defines whether the cpu normalization is enabled.
 	// If set to false, the node cpu normalization ratio will be removed.
 	Enable *bool `json:"enable,omitempty"`
+	// DefaultRatio defines the default cpu normalization.
+	DefaultRatio *float64 `json:"defaultRatio,omitempty"`
 	// RatioModel defines the cpu normalization ratio of each CPU model.
 	// It maps the CPUModel of BasicInfo into the ratios.
 	RatioModel map[string]ModelRatioCfg `json:"ratioModel,omitempty"`

pkg/slo-controller/noderesource/plugins/cpunormalization/plugin.go

@@ -176,8 +176,14 @@ func (p *Plugin) Calculate(_ *configuration.ColocationStrategy, node *corev1.Nod
 
 	ratio, err := getCPUNormalizationRatioFromModel(basicInfo, strategy)
 	if err != nil {
-		return nil, fmt.Errorf("failed to get ratio in cpu normalization calculation, err: %s", err)
+		if strategy.DefaultRatio != nil {
+			klog.V(6).Infof("get no cpu ratio from model, use the default ratio %v for node %s", *strategy.DefaultRatio, node.Name)
+			ratio = *strategy.DefaultRatio
+		} else {
+			return nil, fmt.Errorf("failed to get ratio in cpu normalization calculation, err: %s", err)
+		}
 	}
+
 	if err = isCPUNormalizationRatioValid(ratio); err != nil {
 		return nil, fmt.Errorf("failed to validate ratio in cpu normalization calculation, ratio %v, err: %s", ratio, err)
 	}