--- old/src/hotspot/share/logging/logTag.hpp 2018-04-05 09:15:14.860609041 -0400 +++ new/src/hotspot/share/logging/logTag.hpp 2018-04-05 09:15:14.238545675 -0400 @@ -112,6 +112,7 @@ LOG_TAG(perf) \ LOG_TAG(phases) \ LOG_TAG(plab) \ + LOG_TAG(preview) /* Trace loading of preview feature types */ \ LOG_TAG(promotion) \ LOG_TAG(preorder) /* Trace all classes loaded in order referenced (not loaded) */ \ LOG_TAG(protectiondomain) /* "Trace protection domain verification" */ \