--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/parallel/ParallelScavengeHeap.java	2019-02-13 16:34:56.998271543 +0100
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/parallel/ParallelScavengeHeap.java	2019-02-13 16:34:56.614271557 +0100
@@ -29,6 +29,7 @@
 
 import sun.jvm.hotspot.debugger.*;
 import sun.jvm.hotspot.gc.shared.*;
+import sun.jvm.hotspot.memory.MemRegion;
 import sun.jvm.hotspot.runtime.*;
 import sun.jvm.hotspot.types.*;
 
@@ -88,6 +89,35 @@
       return CollectedHeapName.PARALLEL;
    }
 
+   // Simple wrapper to provide toString() usable for debugging.
+   private class LiveRegionProviderImpl implements LiveRegionsProvider {
+      private String name;
+      private MutableSpace space;
+
+      public LiveRegionProviderImpl(String name, MutableSpace space) {
+         this.name = name;
+         this.space = space;
+      }
+
+      @Override
+      public List<MemRegion> getLiveRegions() {
+         return space.getLiveRegions();
+      }
+      @Override
+      public String toString() {
+         return name;
+      }
+   }
+
+   public void liveRegionsIterate(LiveRegionsClosure closure) {
+      // Add eden space
+      closure.doLiveRegions(new LiveRegionProviderImpl("eden", youngGen().edenSpace()));
+      // Add from-space but not to-space
+      closure.doLiveRegions(new LiveRegionProviderImpl("from", youngGen().fromSpace()));
+
+      closure.doLiveRegions(new LiveRegionProviderImpl("old ", oldGen().objectSpace()));
+   }
+
    public void printOn(PrintStream tty) {
       tty.print("ParallelScavengeHeap [ ");
       youngGen().printOn(tty);