void ThreadLocalAllocBuffer::startup_initialization() {

  {- -------------------------------------------
  (1) TLAB が使用する大域変数を初期化する
      ---------------------------------------- -}

      // Assuming each thread's active tlab is, on average,
      // 1/2 full at a GC
      _target_refills = 100 / (2 * TLABWasteTargetPercent);
      _target_refills = MAX2(_target_refills, (unsigned)1U);

      _global_stats = new GlobalTLABStats();

  {- -------------------------------------------
  (1) メインスレッドの TLAB を初期化する
      (メインスレッドについてだけは, TLAB の初期化よりスレッドの生成の方が速いため, ここで初期化してやる必要がある.
       See: TLAB)
      ---------------------------------------- -}

      // During jvm startup, the main (primordial) thread is initialized
      // before the heap is initialized.  So reinitialize it now.
      guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");
      Thread::current()->tlab().initialize();

  {- -------------------------------------------
  (1) (トレース出力)
      ---------------------------------------- -}

      if (PrintTLAB && Verbose) {
        gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n",
                            min_size(), Thread::current()->tlab().initial_desired_size(), max_size());
      }
    }