--- old/src/share/vm/gc/g1/g1CollectedHeap.cpp	2016-06-23 12:33:39.755511330 -0700
+++ new/src/share/vm/gc/g1/g1CollectedHeap.cpp	2016-06-23 12:33:39.663511333 -0700
@@ -1333,7 +1333,7 @@
         AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(),
                                                 workers()->active_workers(),
                                                 Threads::number_of_non_daemon_threads());
-      workers()->set_active_workers(n_workers);
+      workers()->update_active_workers(n_workers);
 
       ParRebuildRSTask rebuild_rs_task(this);
       workers()->run_task(&rebuild_rs_task);
@@ -3166,7 +3166,7 @@
     uint active_workers = AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(),
                                                                   workers()->active_workers(),
                                                                   Threads::number_of_non_daemon_threads());
-    workers()->set_active_workers(active_workers);
+    workers()->update_active_workers(active_workers);
 
     TraceCollectorStats tcs(g1mm()->incremental_collection_counters());
     TraceMemoryManagerStats tms(false /* fullGC */, gc_cause());