Take subtasks into account when deciding to provision new nodes

core/src/main/java/hudson/model/LoadStatistics.java

@@ -26,6 +26,8 @@ package hudson.model;
 import hudson.Extension;
 import hudson.model.MultiStageTimeSeries.TimeScale;
 import hudson.model.MultiStageTimeSeries.TrendChart;
+import hudson.model.queue.SubTask;
+import hudson.model.queue.Tasks;
 import hudson.util.ColorPalette;
 import hudson.util.NoOverlapCategoryAxis;
 import jenkins.model.Jenkins;
@@ -232,6 +234,9 @@ public abstract class LoadStatistics {
             for (Queue.BuildableItem bi : bis) {
                 if(bi.task.getAssignedLabel()==l)
                     q++;
+                for (SubTask st : Tasks.getSubTasksOf(bi.task))
+                    if (st != bi.task && st.getAssignedLabel()==l)
+                        q++;
             }
             return q;
         }

core/src/main/java/hudson/model/Queue.java

@@ -756,11 +756,19 @@ public class Queue extends ResourceController implements Saveable {
     public synchronized int countBuildableItemsFor(Label l) {
         int r = 0;
         for (BuildableItem bi : buildables.values())
-            if(bi.getAssignedLabel()==l)
+            if(null==l || bi.getAssignedLabel()==l) {
                 r++;
+                for (SubTask st : bi.task.getSubTasks())
+                    if (st != bi.task && (null==l || st.getAssignedLabel()==l))
+                        r++;
+            }
         for (BuildableItem bi : pendings.values())
-            if(bi.getAssignedLabel()==l)
+            if(bi.getAssignedLabel()==l) {
                 r++;
+                for (SubTask st : bi.task.getSubTasks())
+                    if (st != bi.task && (null==l || st.getAssignedLabel()==l))
+                        r++;
+            }
         return r;
     }
 
@@ -768,7 +776,7 @@ public class Queue extends ResourceController implements Saveable {
      * Counts all the {@link BuildableItem}s currently in the queue.
      */
     public synchronized int countBuildableItems() {
-        return buildables.size()+pendings.size();
+        return countBuildableItemsFor(null);
     }
 
     /**