| /* |
| * Copyright (c) 2003, 2015, 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 4858522 |
| * @summary Basic unit test of HotspotRuntimeMBean.getTotalSafepointTime() |
| * |
| * @run main/othervm -XX:+UsePerfData GetTotalSafepointTime |
| */ |
| |
| /* |
| * This test is just a sanity check and does not check for the correct value. |
| */ |
| |
| import sun.management.*; |
| |
| public class GetTotalSafepointTime { |
| |
| private static HotspotRuntimeMBean mbean = |
| (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean(); |
| |
| private static final long NUM_THREAD_DUMPS = 100; |
| |
| // Careful with these values. |
| private static final long MIN_VALUE_FOR_PASS = 1; |
| private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE; |
| |
| private static boolean trace = false; |
| |
| public static void main(String args[]) throws Exception { |
| if (args.length > 0 && args[0].equals("trace")) { |
| trace = true; |
| } |
| |
| // Thread.getAllStackTraces() should cause safepoints. |
| // If this test is failing because it doesn't, |
| // MIN_VALUE_FOR_PASS should be reset to 0 |
| for (int i = 0; i < NUM_THREAD_DUMPS; i++) { |
| Thread.getAllStackTraces(); |
| } |
| |
| long value = mbean.getTotalSafepointTime(); |
| |
| if (trace) { |
| System.out.println("Total safepoint time (ms): " + value); |
| } |
| |
| if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) { |
| throw new RuntimeException("Total safepoint time " + |
| "illegal value: " + value + " ms " + |
| "(MIN = " + MIN_VALUE_FOR_PASS + "; " + |
| "MAX = " + MAX_VALUE_FOR_PASS + ")"); |
| } |
| |
| for (int i = 0; i < 2 * NUM_THREAD_DUMPS; i++) { |
| Thread.getAllStackTraces(); |
| } |
| long value2 = mbean.getTotalSafepointTime(); |
| |
| if (trace) { |
| System.out.println("Total safepoint time2 (ms): " + value2); |
| } |
| |
| if (value2 <= value) { |
| throw new RuntimeException("Total safepoint time " + |
| "did not increase " + |
| "(value = " + value + "; " + |
| "value2 = " + value2 + ")"); |
| } |
| |
| System.out.println("Test passed."); |
| } |
| } |