--- old/src/share/vm/gc/cms/parNewGeneration.cpp	2015-05-20 11:01:58.699205748 +0200
+++ new/src/share/vm/gc/cms/parNewGeneration.cpp	2015-05-20 11:01:58.555200882 +0200
@@ -836,7 +836,6 @@
 {
   _state_set.flush();
   GenCollectedHeap* gch = GenCollectedHeap::heap();
-  gch->set_par_threads(0);  // 0 ==> non-parallel.
   gch->save_marks();
 }
 
@@ -954,7 +953,6 @@
     StrongRootsScope srs(n_workers);
 
     ParNewGenTask tsk(this, _old_gen, reserved().end(), &thread_state_set, &srs);
-    gch->set_par_threads(n_workers);
     gch->rem_set()->prepare_for_younger_refs_iterate(true);
     // It turns out that even when we're using 1 thread, doing the work in a
     // separate thread causes wide variance in run times.  We can't help this
@@ -996,7 +994,6 @@
                                               _gc_timer, _gc_tracer.gc_id());
   } else {
     thread_state_set.flush();
-    gch->set_par_threads(0);  // 0 ==> non-parallel.
     gch->save_marks();
     stats = rp->process_discovered_references(&is_alive, &keep_alive,
                                               &evacuate_followers, NULL,