964   // Only walk all metadata, including the expensive code cache walk, for Full GC

   964   // Only walk all metadata, including the expensive code cache walk, for Full GC

   965   // and only if class redefinition and if there's previous versions of

   965   // and only if class redefinition and if there's previous versions of

   966   // Klasses to delete.

   966   // Klasses to delete.

   967   bool walk_all_metadata = clean_previous_versions &&

   967   bool walk_all_metadata = clean_previous_versions &&

   968                            JvmtiExport::has_redefined_a_class() &&

   968                            JvmtiExport::has_redefined_a_class() &&

   970   MetadataOnStackMark md_on_stack(walk_all_metadata);

   970   MetadataOnStackMark md_on_stack(walk_all_metadata);

   971 

   971 

   972   // Save previous _unloading pointer for CMS which may add to unloading list before

   972   // Save previous _unloading pointer for CMS which may add to unloading list before

   973   // purging and we don't want to rewalk the previously unloaded class loader data.

   973   // purging and we don't want to rewalk the previously unloaded class loader data.

   974   _saved_unloading = _unloading;

   974   _saved_unloading = _unloading;