Support enabling mimalloc and turn it on by default

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project's packages adheres to [Semantic Versioning](http://semver.org/s
 
 ### Changed
 
+- Support and enable by default [mimalloc](https://github.com/microsoft/mimalloc) as a drop-in malloc replacement to reduce nginx memory utilization.
+- Support configuring additional environment variables for NGINX Ingress Controller container to support configuring additional mimalloc [options](https://github.com/microsoft/mimalloc#environment-options).
+
 ## [v1.6.8] 2020-04-09
 
 ### Changed

helm/nginx-ingress-controller-app/Configuration.md

@@ -36,6 +36,8 @@ Parameter | Description | Default
 `controller.autoscaling.targetCPUUtilizationPercentage` | Configures HPA target CPU utilization percentage. This is a replacement for deprecated `configmap.hpa-target-cpu-utilization-percentage` configuration property; if both are configured, `configmap.hpa-target-cpu-utilization-percentage` has precedence. | `50`
 `controller.autoscaling.targetMemoryUtilizationPercentage` | Configures HPA target memory utilization percentage. This is a replacement for deprecated `configmap.hpa-target-memory-utilization-percentage` configuration property; if both are configured, `configmap.hpa-target-memory-utilization-percentage` has precedence. | `80`
 `controller.defaultSSLCertificate` | The Secret referred to by this flag contains the default certificate to be used when accessing the catch-all server. If this flag is not provided NGINX will use a self-signed certificate. Example value: "default/foo-tls". This is a replacement for deprecated `configmap.default-ssl-certificate` configuration property; if both are configured, `configmap.default-ssl-certificate` has precedence. | ""
+`controller.enableMimalloc` | Enables mimalloc as a drop-in replacement for malloc, reduces the memory utilization. | `true`
+`controller.extraEnvs` | Additional environment variables to set. | `[]`
 `controller.ingressController.legacy` | Legacy or node pools cluster. On aws provider node pool clusters LoadBalancer service gets created. Dynamically calculated during cluster creation. | `false`
 `controller.ingressClass` | Ingress class, which controller handles. This is a replacement for deprecated `configmap.ingress-class` configuration property; if both are configured, `configmap.ingress-class` has precedence. | `nginx`
 `controller.lifecycle` | Configures NGINX controller container lifecycle hooks. | By default configured to run `/wait-shutdown` as controller container preStop hook.

helm/nginx-ingress-controller-app/templates/controller-deployment.yaml

@@ -90,6 +90,13 @@ spec:
           valueFrom:
             fieldRef:
               fieldPath: metadata.namespace
+        {{- if .Values.controller.enableMimalloc }}
+        - name: LD_PRELOAD
+          value: /usr/local/lib/libmimalloc.so
+        {{- end }}
+        {{- if .Values.controller.extraEnvs }}
+          {{- toYaml .Values.controller.extraEnvs | nindent 8 }}
+        {{- end }}
         readinessProbe:
           httpGet:
             path: /healthz

helm/nginx-ingress-controller-app/values.yaml

@@ -107,6 +107,20 @@ controller:
         command:
         - /wait-shutdown
 
+  # Enable mimalloc as a drop-in replacement for malloc.
+  # For additional options it provides see https://github.com/microsoft/mimalloc#environment-options
+  # ref: https://github.com/microsoft/mimalloc
+  enableMimalloc: true
+
+  # Additional environment variables to set
+  extraEnvs: []
+  # extraEnvs:
+  #   - name: FOO
+  #     valueFrom:
+  #       secretKeyRef:
+  #         key: FOO
+  #         name: secret-resource
+
   # optional hpa settings
   autoscaling:
     enabled: true