--- old/src/hotspot/share/gc/g1/g1Allocator.inline.hpp	2018-11-21 11:17:07.977745332 +0100
+++ new/src/hotspot/share/gc/g1/g1Allocator.inline.hpp	2018-11-21 11:17:07.397742456 +0100
@@ -109,6 +109,10 @@
 // Set the regions containing the specified address range as archive.
 inline void G1ArchiveAllocator::set_range_archive(MemRegion range, bool open) {
   assert(_archive_check_enabled, "archive range check not enabled");
+  log_info(gc, cds)("Mark %s archive regions in map: [" PTR_FORMAT ", " PTR_FORMAT "]",
+                     open ? "open" : "closed",
+                     p2i(range.start()),
+                     p2i(range.last()));
   if (open) {
     _open_archive_region_map.set_by_address(range, true);
   } else {
@@ -116,6 +120,20 @@
   }
 }
 
+// Clear the archive regions map containing the specified address range.
+inline void G1ArchiveAllocator::clear_range_archive(MemRegion range, bool open) {
+  assert(_archive_check_enabled, "archive range check not enabled");
+  log_info(gc, cds)("Clear %s archive regions in map: [" PTR_FORMAT ", " PTR_FORMAT "]",
+                    open ? "open" : "closed",
+                    p2i(range.start()),
+                    p2i(range.last()));
+  if (open) {
+    _open_archive_region_map.set_by_address(range, false);
+  } else {
+    _closed_archive_region_map.set_by_address(range, false);
+  }
+}
+
 // Check if an object is in a closed archive region using the _archive_region_map.
 inline bool G1ArchiveAllocator::in_closed_archive_range(oop object) {
   // This is the out-of-line part of is_closed_archive_object test, done separately