src/hotspot/share/gc/shared/referenceProcessor.cpp

rev 49684 : imported patch 8201487-do-not-rebalance-with-serial-processing

*** 792,811 ****
  {
    bool mt_processing = task_executor != NULL && _processing_is_mt;
  
    phase_times->set_processing_is_mt(mt_processing);
  
!   // If discovery used MT and a dynamic number of GC threads, then
!   // the queues must be balanced for correctness if fewer than the
!   // maximum number of queues were used.  The number of queue used
!   // during discovery may be different than the number to be used
!   // for processing so don't depend of _num_q < _max_num_q as part
!   // of the test.
!   bool must_balance = _discovery_is_mt;
! 
!   if ((mt_processing && ParallelRefProcBalancingEnabled) ||
!       must_balance) {
      RefProcBalanceQueuesTimeTracker tt(phase_times);
      balance_queues(refs_lists);
    }
  
    // Phase 1 (soft refs only):
--- 792,802 ----
  {
    bool mt_processing = task_executor != NULL && _processing_is_mt;
  
    phase_times->set_processing_is_mt(mt_processing);
  
!   if (mt_processing && ParallelRefProcBalancingEnabled) {
      RefProcBalanceQueuesTimeTracker tt(phase_times);
      balance_queues(refs_lists);
    }
  
    // Phase 1 (soft refs only):