various changes

k8s-dvfs/src/main/groovy/recreationaltech/plugin/K8sConfig.groovy

@@ -272,6 +272,12 @@ class K8sConfig implements ConfigScope {
     """)
     final int dvfsSchedulingNumTopRuntimes
 
+    @ConfigOption
+    @Description("""
+        If not empty, only nodes with the given label will be used.
+    """)
+    final String nodeLabel
+
     /* required by extension point -- do not remove */
     K8sConfig() {
         this(Collections.emptyMap())
@@ -314,7 +320,10 @@ class K8sConfig implements ConfigScope {
         runtimeEstimator = opts.runtimeEstimator as String ?: "LinearFit"
         noiseRuntimeEstimatorNoiseMagnitude = opts.noiseRuntimeEstimatorNoiseMagnitude as Duration ?: new Duration(30, TimeUnit.SECONDS)
         runtimeComparisonEpsilon = opts.runtimeComparisonEpsilon as Duration ?: new Duration(10, TimeUnit.SECONDS)
-        dvfsSchedulingNumTopRuntimes = opts.dvfsSchedulingTopRuntimes as int ?: 3
+        def numTop = opts.dvfsSchedulingNumTopRuntimes
+        dvfsSchedulingNumTopRuntimes = numTop != null && numTop.toString().trim() != '' ? numTop as int : 3
+
+        nodeLabel = opts.nodeLabel as String ?: ""
 
         // -- shortcut to pod image pull-policy
         if( imagePullPolicy )
@@ -376,6 +385,12 @@ class K8sConfig implements ConfigScope {
         return DEFAULT_FUSE_PLUGIN
     }
 
+    String[] getNodeLabelFilter() {
+        if (nodeLabel.empty)
+            return null
+        return nodeLabel.split('=', 2)
+    }
+
     /**
      * Whenever the pod should honour the entrypoint defined by the image (default: false)
      *