Mercurial > hg > truffle
annotate test/gc/7072527/TestFullGCCount.java @ 12986:1b422ef5288a
8025728: Missing volatile specifier for field G1AllocRegion::_alloc_region
Summary: The field G1AllocRegion::_alloc_region needs to be declared volatile as it is used with that intention. Otherwise the compiler may generate the code that reloads the value which might have changed in the meantime, leading to spurious crashes.
Reviewed-by: iveresov, simonis, tschatzl
Contributed-by: Axel Siebenborn <axel.siebenborn@sap.com>
author | tschatzl |
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date | Wed, 23 Oct 2013 10:23:06 +0200 |
parents | bfe3be9ebd6c |
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rev | line source |
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3827 | 1 /* |
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2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
3827 | 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 TestFullGCount.java | |
26 * @bug 7072527 | |
27 * @summary CMS: JMM GC counters overcount in some cases | |
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28 * @run main/othervm -XX:+PrintGC TestFullGCCount |
3827 | 29 */ |
30 import java.util.*; | |
31 import java.lang.management.*; | |
32 | |
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33 /* |
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34 * Originally for a specific failure in CMS, this test now monitors all |
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35 * collectors for double-counting of collections. |
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36 */ |
3827 | 37 public class TestFullGCCount { |
38 | |
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39 static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); |
3827 | 40 |
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41 public static void main(String[] args) { |
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42 int iterations = 20; |
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43 boolean failed = false; |
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44 String errorMessage = ""; |
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45 HashMap<String, List> counts = new HashMap<String, List>(); |
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46 |
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47 // Prime the collection of count lists for all collectors. |
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48 for (int i = 0; i < collectors.size(); i++) { |
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49 GarbageCollectorMXBean collector = collectors.get(i); |
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50 counts.put(collector.getName(), new ArrayList<Long>(iterations)); |
3827 | 51 } |
52 | |
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53 // Perform some gc, record collector counts. |
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54 for (int i = 0; i < iterations; i++) { |
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55 System.gc(); |
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56 addCollectionCount(counts, i); |
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57 } |
3827 | 58 |
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59 // Check the increments: |
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60 // Old gen collectors should increase by one, |
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61 // New collectors may or may not increase. |
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62 // Any increase >=2 is unexpected. |
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63 for (String collector : counts.keySet()) { |
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64 System.out.println("Checking: " + collector); |
3827 | 65 |
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66 for (int i = 0; i < iterations - 1; i++) { |
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67 List<Long> theseCounts = counts.get(collector); |
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68 long a = theseCounts.get(i); |
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69 long b = theseCounts.get(i + 1); |
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70 if (b - a >= 2) { |
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71 failed = true; |
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72 errorMessage += "Collector '" + collector + "' has increment " + (b - a) + |
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73 " at iteration " + i + "\n"; |
3827 | 74 } |
75 } | |
76 } | |
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77 if (failed) { |
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78 System.err.println(errorMessage); |
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79 throw new RuntimeException("FAILED: System.gc collections miscounted."); |
3827 | 80 } |
81 System.out.println("Passed."); | |
82 } | |
83 | |
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84 private static void addCollectionCount(HashMap<String, List> counts, int iteration) { |
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85 for (int i = 0; i < collectors.size(); i++) { |
3827 | 86 GarbageCollectorMXBean collector = collectors.get(i); |
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87 List thisList = counts.get(collector.getName()); |
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88 thisList.add(collector.getCollectionCount()); |
3827 | 89 } |
90 } | |
91 } |