test/jdk/sun/management/HotspotRuntimeMBean/GetTotalSafepointTime.java
author mbaesken
Thu, 01 Aug 2019 08:59:31 +0200
changeset 57611 c0023e364b6f
parent 47216 71c04702a3d5
permissions -rw-r--r--
8228658: test GetTotalSafepointTime.java fails on fast Linux machines with Total safepoint time 0 ms Reviewed-by: dholmes, jcbeyler
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/*
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 * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @bug     4858522
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 * @summary Basic unit test of HotspotRuntimeMBean.getTotalSafepointTime()
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 *
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 * @run main/othervm -XX:+UsePerfData GetTotalSafepointTime
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 */
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/*
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 * This test is just a sanity check and does not check for the correct value.
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 */
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import sun.management.*;
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public class GetTotalSafepointTime {
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    private static HotspotRuntimeMBean mbean =
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        (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
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    // Careful with these values.
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    private static final long MIN_VALUE_FOR_PASS = 1;
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    // Thread.getAllStackTraces() should cause safepoints.
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    // If this test is failing because it doesn't,
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    // MIN_VALUE_FOR_PASS should be reset to 0
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    public static long executeThreadDumps(long initial_value) {
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        long value;
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        do {
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            Thread.getAllStackTraces();
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            value = mbean.getTotalSafepointTime();
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        } while (value == initial_value);
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        return value;
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    }
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    public static void main(String args[]) throws Exception {
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        long value = executeThreadDumps(0);
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        System.out.println("Total safepoint time (ms): " + value);
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        if (value < MIN_VALUE_FOR_PASS) {
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            throw new RuntimeException("Total safepoint time " +
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                                       "illegal value: " + value + " ms " +
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                                       "(MIN = " + MIN_VALUE_FOR_PASS + ")");
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        }
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        long value2 = executeThreadDumps(value);
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        System.out.println("Total safepoint time (ms): " + value2);
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        if (value2 <= value) {
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            throw new RuntimeException("Total safepoint time " +
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                                       "did not increase " +
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                                       "(value = " + value + "; " +
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                                       "value2 = " + value2 + ")");
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        }
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        System.out.println("Test passed.");
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    }
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}