src/hotspot/share/utilities/globalCounter.cpp

@@ -57,11 +57,12 @@
 };
 
 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);
+  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);
   }