--- old/src/share/vm/gc/g1/g1CollectedHeap.cpp	2016-02-22 13:40:09.283127368 +0100
+++ new/src/share/vm/gc/g1/g1CollectedHeap.cpp	2016-02-22 13:40:09.167127363 +0100
@@ -3235,10 +3235,6 @@
 
     GCTraceCPUTime tcpu;
 
-    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);
     FormatBuffer<> gc_string("Pause ");
     if (collector_state()->during_initial_mark_pause()) {
       gc_string.append("Initial Mark");
@@ -3249,6 +3245,11 @@
     }
     GCTraceTime(Info, gc) tm(gc_string, NULL, gc_cause(), true);
 
+    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);
+
     g1_policy()->note_gc_start(active_workers);
 
     TraceCollectorStats tcs(g1mm()->incremental_collection_counters());