src/hotspot/share/utilities/globalCounter.cpp

*** 57,67 ****
  };
  
  void GlobalCounter::write_synchronize() {
    assert((*Thread::current()->get_rcu_counter() & COUNTER_ACTIVE) == 0x0, "must be outside a critcal section");
    // Atomic::add must provide fence since we have storeload dependency.
!   volatile uintx gbl_cnt = Atomic::add((uintx)COUNTER_INCREMENT, &_global_counter._counter);
    // Do all RCU threads.
    CounterThreadCheck ctc(gbl_cnt);
    for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) {
      ctc.do_thread(thread);
    }
--- 57,68 ----
  };
  
  void GlobalCounter::write_synchronize() {
    assert((*Thread::current()->get_rcu_counter() & COUNTER_ACTIVE) == 0x0, "must be outside a critcal section");
    // Atomic::add must provide fence since we have storeload dependency.
!   volatile uintx gbl_cnt = Atomic::add((uintx)COUNTER_INCREMENT, &_global_counter._counter,
!                                        memory_order_conservative);
    // Do all RCU threads.
    CounterThreadCheck ctc(gbl_cnt);
    for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) {
      ctc.do_thread(thread);
    }