--- old/src/hotspot/share/gc/g1/collectionSetChooser.cpp	2018-11-19 14:03:34.682689000 -0800
+++ new/src/hotspot/share/gc/g1/collectionSetChooser.cpp	2018-11-19 14:03:33.710506600 -0800
@@ -49,6 +49,14 @@
     return -1;
   }
 
+  if (hr1->is_premature_old() && !hr2->is_premature_old()) {
+    return -1;
+  }
+
+  if (hr2->is_premature_old() && !hr1->is_premature_old()) {
+    return 1;
+  }
+
   double gc_eff1 = hr1->gc_efficiency();
   double gc_eff2 = hr2->gc_efficiency();
   if (gc_eff1 > gc_eff2) {
@@ -283,7 +291,7 @@
 bool CollectionSetChooser::should_add(HeapRegion* hr) const {
   return !hr->is_young() &&
          !hr->is_pinned() &&
-         region_occupancy_low_enough_for_evac(hr->live_bytes()) &&
+         (hr->is_premature_old() || region_occupancy_low_enough_for_evac(hr->live_bytes())) &&
          hr->rem_set()->is_complete();
 }