8303824: Parallel: Use more strict card table API

Reviewed-by: tschatzl, iwalulya, ysr

Author: albertnetymk

src/hotspot/share/gc/parallel/psOldGen.hpp

@@ -103,6 +103,11 @@ class PSOldGen : public CHeapObj<mtGC> {
                      (HeapWord*)(_virtual_space->high_boundary()));
   }
 
+  MemRegion committed() const {
+    return MemRegion((HeapWord*)(_virtual_space->low()),
+                     (HeapWord*)(_virtual_space->high()));
+  }
+
   size_t max_gen_size() const { return _max_gen_size; }
   size_t min_gen_size() const { return _min_gen_size; }
 

src/hotspot/share/gc/parallel/psParallelCompact.cpp

@@ -1017,11 +1017,11 @@ void PSParallelCompact::post_compact()
     to_space->is_empty();
 
   PSCardTable* ct = heap->card_table();
-  MemRegion old_mr = heap->old_gen()->reserved();
+  MemRegion old_mr = heap->old_gen()->committed();
   if (young_gen_empty) {
-    ct->clear(old_mr);
+    ct->clear_MemRegion(old_mr);
   } else {
-    ct->invalidate(old_mr);
+    ct->dirty_MemRegion(old_mr);
   }
 
   // Delete metaspaces for unloaded class loaders and clean up loader_data graph