--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/jdk/jfr/jcmd/TestJcmdChangeLogLevel.java	2019-02-08 18:33:42.871833453 +0300
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2016, 2018, 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.jcmd;
+
+
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+import jdk.test.lib.dcmd.JcmdExecutor;
+import jdk.test.lib.dcmd.PidJcmdExecutor;
+
+/**
+ * @test TestJcmdLogLevelChange
+ * @key jfr
+ * @summary Test changing log level
+ * 
+ *
+ * @library /lib /
+ *
+ * @run main/othervm -Xlog:jfr=info jdk.jfr.jcmd.TestJcmdChangeLogLevel
+ */
+public class TestJcmdChangeLogLevel {
+    public static void main(String[] args) throws Exception {
+        final String fileName = "jfr_trace.txt";
+        final String findWhat = "[info][jfr] Flight Recorder initialized";
+        boolean passed = false;
+
+        JcmdExecutor je = new PidJcmdExecutor();
+        je.execute("VM.log output='file=" + fileName + "' what='jfr=info'");
+        je.execute("JFR.start duration=1s");
+        List<String> lines;
+
+        do {
+            try {
+                lines = Files.readAllLines(Paths.get(fileName));
+            } catch (IOException e) {
+                throw new Error(e);
+            }
+            for (String l : lines) {
+                if (l.toString().contains(findWhat)) {
+                    passed = true;
+                    break;
+                }
+            }
+            if (lines.size() > 100) {
+                break; /* did not find it */
+            }
+        } while(!passed);
+
+        if (!passed) {
+            throw new Error("Not found " + findWhat  + " in stream" + lines);
+        }
+
+        System.out.println("PASSED");
+    }
+}