1 /*
   2  * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug     4858522
  27  * @summary Basic unit test of HotspotRuntimeMBean.getTotalSafepointTime()
  28  *
  29  * @run main/othervm -XX:+UsePerfData GetTotalSafepointTime
  30  */
  31 
  32 /*
  33  * This test is just a sanity check and does not check for the correct value.
  34  */
  35 
  36 import sun.management.*;
  37 
  38 public class GetTotalSafepointTime {
  39 
  40     private static HotspotRuntimeMBean mbean =
  41         (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
  42 
  43     private static final long NUM_THREAD_DUMPS = 100;
  44 
  45     // Careful with these values.
  46     private static final long MIN_VALUE_FOR_PASS = 1;
  47     private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
  48 
  49     private static boolean trace = false;
  50 
  51     public static void main(String args[]) throws Exception {
  52         if (args.length > 0 && args[0].equals("trace")) {
  53             trace = true;
  54         }
  55 
  56         // Thread.getAllStackTraces() should cause safepoints.
  57         // If this test is failing because it doesn't,
  58         // MIN_VALUE_FOR_PASS should be reset to 0
  59         for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
  60              Thread.getAllStackTraces();
  61         }
  62 
  63         long value = mbean.getTotalSafepointTime();
  64 
  65         if (trace) {
  66             System.out.println("Total safepoint time (ms): " + value);
  67         }
  68 
  69         if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
  70             throw new RuntimeException("Total safepoint time " +
  71                                        "illegal value: " + value + " ms " +
  72                                        "(MIN = " + MIN_VALUE_FOR_PASS + "; " +
  73                                        "MAX = " + MAX_VALUE_FOR_PASS + ")");
  74         }
  75 
  76         for (int i = 0; i < 2 * NUM_THREAD_DUMPS; i++) {
  77              Thread.getAllStackTraces();
  78         }
  79         long value2 = mbean.getTotalSafepointTime();
  80 
  81         if (trace) {
  82             System.out.println("Total safepoint time2 (ms): " + value2);
  83         }
  84 
  85         if (value2 <= value) {
  86             throw new RuntimeException("Total safepoint time " +
  87                                        "did not increase " +
  88                                        "(value = " + value + "; " +
  89                                        "value2 = " + value2 + ")");
  90         }
  91 
  92         System.out.println("Test passed.");
  93     }
  94 }