--- old/src/share/vm/gc/g1/g1RemSet.cpp	2017-05-11 16:14:56.054517736 +0200
+++ new/src/share/vm/gc/g1/g1RemSet.cpp	2017-05-11 16:14:55.951514554 +0200
@@ -735,6 +735,7 @@
 
   HeapWord* scan_limit = _scan_state->scan_top(r->hrm_index());
   if (scan_limit <= start) {
+    // If the card starts above the area in the region containing objects to scan, skip it.
     return false;
   }