src/hotspot/share/gc/g1/g1CollectedHeap.cpp

*** 2898,2911 ****
                                                                    workers()->active_workers(),
                                                                    Threads::number_of_non_daemon_threads());
      active_workers = workers()->update_active_workers(active_workers);
      log_info(gc,task)("Using %u workers of %u for evacuation", active_workers, workers()->total_workers());
  
      G1MonitoringScope ms(g1mm(),
                           false /* full_gc */,
                           collector_state()->yc_type() == Mixed /* all_memory_pools_affected */);
! 
      G1HeapTransition heap_transition(this);
      size_t heap_used_bytes_before_gc = used();
  
      // Don't dynamically change the number of GC threads this early.  A value of
      // 0 is used to indicate serial work.  When parallel work is done,
--- 2898,2916 ----
                                                                    workers()->active_workers(),
                                                                    Threads::number_of_non_daemon_threads());
      active_workers = workers()->update_active_workers(active_workers);
      log_info(gc,task)("Using %u workers of %u for evacuation", active_workers, workers()->total_workers());
  
+     if(gc_cause() == GCCause::_java_lang_system_gc) {
+         G1MonitoringScope ms(g1mm(),
+                              true /* full_gc */,
+                              collector_state()->yc_type() == Mixed /* all_memory_pools_affected */);
+     } else {
          G1MonitoringScope ms(g1mm(),
                               false /* full_gc */,
                               collector_state()->yc_type() == Mixed /* all_memory_pools_affected */);
!     }
      G1HeapTransition heap_transition(this);
      size_t heap_used_bytes_before_gc = used();
  
      // Don't dynamically change the number of GC threads this early.  A value of
      // 0 is used to indicate serial work.  When parallel work is done,