void ThreadLocalAllocBuffer::resize_all_tlabs() {

  {- -------------------------------------------
  (1) 全ての JavaThread の TLAB に対して ThreadLocalAllocBuffer::resize() を呼び出すだけ.
      ---------------------------------------- -}

      for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
        thread->tlab().resize();
      }
    }