src/share/vm/gc/g1/heapRegionRemSet.cpp

rev 9982 : 8147087: Race when reusing PerRegionTable bitmaps may result in dropped remembered set entries
Summary: Do not make reused PRTs available to other threads before the bitmap of the PRT has been cleared.
Contributed-by: Poonam Bajaj <poonam.bajaj@oracle.com>, Thomas Schatzl <thomas.schatzl@oracle.com>
rev 9983 : [mq]: 8147087-comments

@@ -108,11 +108,13 @@
     }
   }
 
 public:
 
-  HeapRegion* hr() const { return _hr; }
+  HeapRegion* hr() const { 
+    return (HeapRegion*) OrderAccess::load_ptr_acquire(&_hr);
+  }
 
   jint occupied() const {
     // Overkill, but if we ever need it...
     // guarantee(_occupied == _bm.count_one_bits(), "Check");
     return _occupied;