--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/src/share/classes/jdk/jfr/internal/LogTag.java	2019-01-29 10:59:33.323741694 +0800
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.internal;
+
+/* Mapped against c++ enum in jfrLogTagSet.hpp */
+public enum LogTag {
+    /**
+     * Covers
+     * <ul>
+     * <li>Initialization of Flight Recorder
+     * <li> recording life cycle (start, stop and dump)
+     * <li> repository life cycle
+     * <li>loading of configuration files.
+     * </ul>
+     * Target audience: operations
+     */
+    JFR(0),
+    /**
+     * Covers general implementation aspects of JFR (for Hotspot developers)
+     */
+    JFR_SYSTEM(1),
+    /**
+     * Covers JVM/JDK events (for Hotspot developers)
+     */
+    JFR_SYSTEM_EVENT(2),
+    /**
+     * Covers setting for the JVM/JDK  (for Hotspot developers)
+     */
+    JFR_SYSTEM_SETTING(3),
+    /**
+     * Covers generated bytecode (for Hotspot developers)
+     */
+    JFR_SYSTEM_BYTECODE(4),
+    /**
+     * Covers XML parsing (for Hotspot developers)
+     */
+    JFR_SYSTEM_PARSER(5),
+    /**
+     * Covers metadata for JVM/JDK (for Hotspot developers)
+     */
+    JFR_SYSTEM_METADATA(6),
+    /**
+     *  Covers metadata for Java user (for Hotspot developers)
+     */
+    JFR_METADATA(7),
+    /**
+     * Covers events (for users of the JDK)
+     */
+    JFR_EVENT(8),
+    /**
+     * Covers setting (for users of the JDK)
+     */
+    JFR_SETTING(9);
+    /* set from native side */
+    private volatile int tagSetLevel = 100; // prevent logging if JVM log system has not been initialized
+
+    final int id;
+
+    LogTag(int tagId) {
+        id = tagId;
+    }
+
+    public boolean shouldLog(int level) {
+        return true; // jdk8 doesn't support log level, leave the control to hotspot. see jfrLog.hpp
+    }
+}