diff -r 1df45f48022b -r a2d991d1d628 hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp
--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp	Wed Mar 02 15:55:47 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp	Wed Mar 02 15:57:48 2016 +0100
@@ -1760,8 +1760,8 @@
   _young_list(new YoungList(this)),
   _gc_time_stamp(0),
   _summary_bytes_used(0),
-  _survivor_evac_stats(YoungPLABSize, PLABWeight),
-  _old_evac_stats(OldPLABSize, PLABWeight),
+  _survivor_evac_stats("Young", YoungPLABSize, PLABWeight),
+  _old_evac_stats("Old", OldPLABSize, PLABWeight),
   _expand_heap_after_alloc_failure(true),
   _old_marking_cycles_started(0),
   _old_marking_cycles_completed(0),