src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp

*** 6805,6818 ****
--- 6805,6822 ----
    }
  };
  
  void G1CollectedHeap::mark_strong_code_roots(uint worker_id) {
    MarkStrongCodeRootsHRClosure cl(this, worker_id);
+   if (G1CollectedHeap::use_parallel_gc_threads()) {
      heap_region_par_iterate_chunked(&cl,
                                      worker_id,
                                      workers()->active_workers(),
                                      HeapRegion::ParMarkRootClaimValue);
+   } else {
+     heap_region_iterate(&cl);
+   }
  }
  
  class RebuildStrongCodeRootClosure: public CodeBlobClosure {
    G1CollectedHeap* _g1h;