src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp

*** 3069,3082 ****
        int n_workers = workers->active_workers();
        CMSParInitialMarkTask tsk(this, n_workers);
        gch->set_par_threads(n_workers);
        initialize_sequential_subtasks_for_young_gen_rescan(n_workers);
        if (n_workers > 1) {
!         GenCollectedHeap::StrongRootsScope srs(gch);
          workers->run_task(&tsk);
        } else {
!         GenCollectedHeap::StrongRootsScope srs(gch);
          tsk.work(0);
        }
        gch->set_par_threads(0);
      } else {
        // The serial version.
--- 3069,3082 ----
        int n_workers = workers->active_workers();
        CMSParInitialMarkTask tsk(this, n_workers);
        gch->set_par_threads(n_workers);
        initialize_sequential_subtasks_for_young_gen_rescan(n_workers);
        if (n_workers > 1) {
!         GenCollectedHeap::StrongRootsScope srs;
          workers->run_task(&tsk);
        } else {
!         GenCollectedHeap::StrongRootsScope srs;
          tsk.work(0);
        }
        gch->set_par_threads(0);
      } else {
        // The serial version.
*** 5167,5181 ****
    if (n_workers > 1) {
      // Make refs discovery MT-safe, if it isn't already: it may not
      // necessarily be so, since it's possible that we are doing
      // ST marking.
      ReferenceProcessorMTDiscoveryMutator mt(ref_processor(), true);
!     GenCollectedHeap::StrongRootsScope srs(gch);
      workers->run_task(&tsk);
    } else {
      ReferenceProcessorMTDiscoveryMutator mt(ref_processor(), false);
!     GenCollectedHeap::StrongRootsScope srs(gch);
      tsk.work(0);
    }
  
    gch->set_par_threads(0);  // 0 ==> non-parallel.
    // restore, single-threaded for now, any preserved marks
--- 5167,5181 ----
    if (n_workers > 1) {
      // Make refs discovery MT-safe, if it isn't already: it may not
      // necessarily be so, since it's possible that we are doing
      // ST marking.
      ReferenceProcessorMTDiscoveryMutator mt(ref_processor(), true);
!     GenCollectedHeap::StrongRootsScope srs;
      workers->run_task(&tsk);
    } else {
      ReferenceProcessorMTDiscoveryMutator mt(ref_processor(), false);
!     GenCollectedHeap::StrongRootsScope srs;
      tsk.work(0);
    }
  
    gch->set_par_threads(0);  // 0 ==> non-parallel.
    // restore, single-threaded for now, any preserved marks
*** 5239,5249 ****
      GCTraceTime t("root rescan", PrintGCDetails, false, _gc_timer_cm, _gc_tracer_cm->gc_id());
  
      verify_work_stacks_empty();
  
      gch->rem_set()->prepare_for_younger_refs_iterate(false); // Not parallel.
!     GenCollectedHeap::StrongRootsScope srs(gch);
  
      gch->gen_process_roots(_cmsGen->level(),
                             true,  // younger gens as roots
                             false, // use the local StrongRootsScope
                             GenCollectedHeap::ScanningOption(roots_scanning_options()),
--- 5239,5249 ----
      GCTraceTime t("root rescan", PrintGCDetails, false, _gc_timer_cm, _gc_tracer_cm->gc_id());
  
      verify_work_stacks_empty();
  
      gch->rem_set()->prepare_for_younger_refs_iterate(false); // Not parallel.
!     GenCollectedHeap::StrongRootsScope srs;
  
      gch->gen_process_roots(_cmsGen->level(),
                             true,  // younger gens as roots
                             false, // use the local StrongRootsScope
                             GenCollectedHeap::ScanningOption(roots_scanning_options()),