--- /dev/null Wed Nov 8 09:07:34 2017 +++ new/test/hotspot/jtreg/runtime/Thread/TestThreadDumpSMRInfo.java Wed Nov 8 09:07:33 2017 @@ -0,0 +1,93 @@ +/* + * Copyright (c) 2017, 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. + * + * 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. + */ + +/* + * @test + * @bug 8167108 + * @summary Checks whether jstack reports a "Threads class SMR info" section. + * + * @library /test/lib + * @modules java.base/jdk.internal.misc + * java.management + * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+EnableThreadSMRStatistics TestThreadDumpSMRInfo + */ + +import jdk.test.lib.process.OutputAnalyzer; +import jdk.test.lib.JDKToolFinder; + +public class TestThreadDumpSMRInfo { + // jstack tends to be closely bound to the VM that we are running + // so use getTestJDKTool() instead of getCompileJDKTool() or even + // getJDKTool() which can fall back to "compile.jdk". + final static String JSTACK = JDKToolFinder.getTestJDKTool("jstack"); + final static String PID = "" + ProcessHandle.current().pid(); + + // Here's a sample "Threads class SMR info" section: + // + // Threads class SMR info: + // _smr_java_thread_list=0x0000000000ce8da0, length=23, elements={ + // 0x000000000043a800, 0x0000000000aee800, 0x0000000000b06800, 0x0000000000b26000, + // 0x0000000000b28800, 0x0000000000b2b000, 0x0000000000b2e000, 0x0000000000b30000, + // 0x0000000000b32800, 0x0000000000b35000, 0x0000000000b3f000, 0x0000000000b41800, + // 0x0000000000b44000, 0x0000000000b46800, 0x0000000000b48800, 0x0000000000b53000, + // 0x0000000000b55800, 0x0000000000b57800, 0x0000000000b5a000, 0x0000000000b5c800, + // 0x0000000000cc8800, 0x0000000000fd9800, 0x0000000000ef4800 + // } + // _smr_java_thread_list_alloc_cnt=24, _smr_java_thread_list_free_cnt=23, _smr_java_thread_list_max=23, _smr_nested_thread_list_max=0 + // _smr_delete_lock_wait_cnt=0, _smr_delete_lock_wait_max=0 + // _smr_to_delete_list_cnt=0, _smr_to_delete_list_max=1 + + final static String HEADER_STR = "Threads class SMR info:"; + + static boolean verbose = false; + + public static void main(String[] args) throws Exception { + if (args.length != 0) { + int arg_i = 0; + if (args[arg_i].equals("-v")) { + verbose = true; + arg_i++; + } + } + + ProcessBuilder pb = new ProcessBuilder(JSTACK, PID); + OutputAnalyzer output = new OutputAnalyzer(pb.start()); + + if (verbose) { + System.out.println("stdout: " + output.getStdout()); + } + + output.shouldHaveExitValue(0); + System.out.println("INFO: jstack ran successfully."); + + output.shouldContain(HEADER_STR); + System.out.println("INFO: Found: '" + HEADER_STR + "' in jstack output."); + + System.out.println("Test PASSED."); + } + + static void usage() { + System.err.println("Usage: java TestThreadDumpSMRInfo [-v]"); + System.exit(1); + } +}