annotate test/compiler/5091921/Test6186134.java @ 20543:e7d0505c8a30

8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents bad7ecd0b6ed
children
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 /**
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26 * @test
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27 * @bug 6186134
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28 * @summary Server virtual machine produces/exeutes incorrect code.
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29 *
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30 * @run main Test6186134 100000
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31 */
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32 import java.util.ArrayList;
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33
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34 public class Test6186134 {
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35
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36 int num = 0;
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37
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38 public Test6186134(int n) {
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39 num = n;
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40 }
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41
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42 public boolean more() {
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43 return num-- > 0;
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44 }
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45
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46 public ArrayList test1() {
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47 ArrayList res = new ArrayList();
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48 int maxResults = Integer.MAX_VALUE;
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49 int n = 0;
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50 boolean more = more();
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51 while ((n++ < maxResults) && more) {
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52 res.add(new Object());
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53 more = more();
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54 }
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55 return res;
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56 }
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57
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58 public static void main(String[] pars) {
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59 int n = Integer.parseInt(pars[0]);
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60 for (int i=0; i<n; i++) {
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61 Test6186134 t = new Test6186134(10);
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62 int size = t.test1().size();
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63 if (size != 10) {
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64 System.out.println("wrong size: " + size +", should be 10");
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65 System.exit(97);
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66 }
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67 }
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68 System.out.println("Passed");
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69 }
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70 }
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71