--- old/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-09-05 21:55:19.941680091 -0700
+++ new/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-09-05 21:55:19.522640189 -0700
@@ -2900,8 +2900,9 @@
     active_workers = workers()->update_active_workers(active_workers);
     log_info(gc,task)("Using %u workers of %u for evacuation", active_workers, workers()->total_workers());
 
+    bool full_gc = (gc_cause() == GCCause::_java_lang_system_gc);
     G1MonitoringScope ms(g1mm(),
-                         false /* full_gc */,
+                         full_gc /* full_gc */,
                          collector_state()->yc_type() == Mixed /* all_memory_pools_affected */);
 
     G1HeapTransition heap_transition(this);