void ThreadLocalAllocBuffer::fill(HeapWord* start,
                                  HeapWord* top,
                                  size_t    new_size) {

  {- -------------------------------------------
  (1) _number_of_refills フィールドの値をインクリメントしておく.
      ---------------------------------------- -}

      _number_of_refills++;

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

      if (PrintTLAB && Verbose) {
        print_stats("fill");
      }

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert(top <= start + new_size - alignment_reserve(), "size too small");

  {- -------------------------------------------
  (1) ThreadLocalAllocBuffer::initialize() を呼んで, 各フィールドを 0 に初期化しておく.
      ---------------------------------------- -}

      initialize(start, top, start + new_size - alignment_reserve());

  {- -------------------------------------------
  (1) ThreadLocalAllocBuffer::refill_waste_limit() の値を初期値に戻しておく.
      (See: CollectedHeap::allocate_from_tlab_slow())
      ---------------------------------------- -}

      // Reset amount of internal fragmentation
      set_refill_waste_limit(initial_refill_waste_limit());
    }