--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp	Mon May 02 17:58:42 2016 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp	Mon May 02 18:54:09 2016 +0200
@@ -3106,6 +3106,8 @@
   SvcGCMarker sgcm(SvcGCMarker::MINOR);
   ResourceMark rm;
 
+  g1_policy()->note_gc_start();
+
   wait_for_root_region_scanning();
 
   print_heap_before_gc();
@@ -3165,8 +3167,6 @@
                                                                   Threads::number_of_non_daemon_threads());
     workers()->set_active_workers(active_workers);
 
-    g1_policy()->note_gc_start();
-
     TraceCollectorStats tcs(g1mm()->incremental_collection_counters());
     TraceMemoryManagerStats tms(false /* fullGC */, gc_cause());