void SafepointSynchronize::update_statistics_on_sync_end(jlong end_time) {

  {- -------------------------------------------
  (1) _safepoint_stats[_cur_stat_index] に入っている統計情報を更新する.
      ---------------------------------------- -}

      SafepointStats *spstat = &_safepoint_stats[_cur_stat_index];

      if (spstat->_nof_threads_wait_to_block != 0) {
        spstat->_time_to_wait_to_block = end_time -
          spstat->_time_to_wait_to_block;
      }

      // Records the end time of sync which will be used to calculate the total
      // vm operation time. Again, the real time spending in syncing will be deducted
      // from the start of the sync time later when end_statistics is called.
      spstat->_time_to_sync = end_time - _safepoint_begin_time;
      if (spstat->_time_to_sync > _max_sync_time) {
        _max_sync_time = spstat->_time_to_sync;
      }

      spstat->_time_to_do_cleanups = end_time;
    }