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comparison test/gc/g1/TestEagerReclaimHumongousRegions2.java @ 20307:04d77ac27223

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8051973: Eager reclaim leaves marks of marked but reclaimed objects on the next bitmap Summary: Eager reclaim also needs to clear marks of eagerly reclaimed regions if they have already been marked during concurrent mark. Reviewed-by: jmasa
author tschatzl
date Thu, 31 Jul 2014 09:23:24 +0200
parents
children 2d1534aa7131
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20306:e02e18f40eae 20307:04d77ac27223
1 /*
2 * Copyright (c) 2014, 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 TestEagerReclaimHumongousRegions2
26 * @bug 8051973
27 * @summary Test to make sure that eager reclaim of humongous objects correctly clears
28 * mark bitmaps at reclaim.
29 * @key gc
30 * @library /testlibrary
31 */
32
33 import java.util.ArrayList;
34 import java.util.LinkedList;
35 import java.util.Random;
36
37 import com.oracle.java.testlibrary.OutputAnalyzer;
38 import com.oracle.java.testlibrary.ProcessTools;
39
40 // An object that has a few references to other instances to slow down marking.
41 class ObjectWithSomeRefs {
42 public ObjectWithSomeRefs other1;
43 public ObjectWithSomeRefs other2;
44 public ObjectWithSomeRefs other3;
45 public ObjectWithSomeRefs other4;
46 }
47
48 class ReclaimRegionFast {
49 public static final int M = 1024*1024;
50
51 public static LinkedList<Object> garbageList = new LinkedList<Object>();
52
53 public static void genGarbage(Object large) {
54 for (int i = 0; i < 64*1024; i++) {
55 Object[] garbage = new Object[50];
56 garbage[0] = large;
57 garbageList.add(garbage);
58 }
59 garbageList.clear();
60 }
61
62 public static ArrayList<ObjectWithSomeRefs> longList = new ArrayList<ObjectWithSomeRefs>();
63
64 public static void main(String[] args) {
65
66 for (int i = 0; i < 16*1024; i++) {
67 longList.add(new ObjectWithSomeRefs());
68 }
69
70 Random rnd = new Random();
71 for (int i = 0; i < longList.size(); i++) {
72 int len = longList.size();
73 longList.get(i).other1 = longList.get(rnd.nextInt(len));
74 longList.get(i).other2 = longList.get(rnd.nextInt(len));
75 longList.get(i).other3 = longList.get(rnd.nextInt(len));
76 longList.get(i).other4 = longList.get(rnd.nextInt(len));
77 }
78
79 int[] large1 = new int[M];
80 int[] large2 = null;
81 int[] large3 = null;
82 int[] large4 = null;
83
84 Object ref_from_stack = large1;
85
86 for (int i = 0; i < 20; i++) {
87 // A set of large objects that will be reclaimed eagerly - and hopefully marked.
88 large1 = new int[M - 20];
89 large2 = new int[M - 20];
90 large3 = new int[M - 20];
91 large4 = new int[M - 20];
92 genGarbage(large1);
93 // Make sure that the compiler cannot completely remove
94 // the allocation of the large object until here.
95 System.out.println(large1 + " " + large2 + " " + large3 + " " + large4);
96 }
97
98 // Keep the reference to the first object alive.
99 System.out.println(ref_from_stack);
100 }
101 }
102
103 public class TestEagerReclaimHumongousRegions2 {
104 public static void main(String[] args) throws Exception {
105 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
106 "-XX:+UseG1GC",
107 "-Xms128M",
108 "-Xmx128M",
109 "-Xmn2M",
110 "-XX:G1HeapRegionSize=1M",
111 "-XX:InitiatingHeapOccupancyPercent=0", // Want to have as much as possible initial marks.
112 "-XX:+PrintGC",
113 "-XX:+VerifyAfterGC",
114 "-XX:ConcGCThreads=1", // Want to make marking as slow as possible.
115 "-XX:+IgnoreUnrecognizedVMOptions", // G1VerifyBitmaps is develop only.
116 "-XX:+G1VerifyBitmaps",
117 ReclaimRegionFast.class.getName());
118 OutputAnalyzer output = new OutputAnalyzer(pb.start());
119 output.shouldHaveExitValue(0);
120 }
121 }
122