void GlobalTLABStats::initialize() {

  {- -------------------------------------------
  (1) 各フィールドを 0 に初期化するだけ.
      ---------------------------------------- -}

      // Clear counters summarizing info from all threads
      _allocating_threads      = 0;
      _total_refills           = 0;
      _max_refills             = 0;
      _total_allocation        = 0;
      _total_gc_waste          = 0;
      _max_gc_waste            = 0;
      _total_slow_refill_waste = 0;
      _max_slow_refill_waste   = 0;
      _total_fast_refill_waste = 0;
      _max_fast_refill_waste   = 0;
      _total_slow_allocations  = 0;
      _max_slow_allocations    = 0;
    }