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annotate test/runtime/NMT/MallocSiteHashOverflow.java @ 21784:f4e1d958f1c3

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[AMD64] Create AMD64 specific address nodes.
author Roland Schatz <roland.schatz@oracle.com>
date Mon, 08 Jun 2015 19:19:45 +0200
parents ec2c6fdd1ce6
children
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1 /*
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2 * Copyright (c) 2014, 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 * @test
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26 * @summary Test corner case that overflows malloc site hashtable bucket
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27 * @requires sun.arch.data.model == "32"
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28 * @key nmt jcmd stress
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29 * @library /testlibrary /testlibrary/whitebox
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30 * @build MallocSiteHashOverflow
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31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
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33 */
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34
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35 import com.oracle.java.testlibrary.*;
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36 import sun.hotspot.WhiteBox;
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37
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38 public class MallocSiteHashOverflow {
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39
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40 public static void main(String args[]) throws Exception {
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41
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42 // Size of entries based on malloc tracking header defined in mallocTracker.hpp
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43 // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
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44 long entries = 257;
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45
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46 OutputAnalyzer output;
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47 WhiteBox wb = WhiteBox.getWhiteBox();
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48 int MAX_HASH_SIZE = wb.NMTGetHashSize();
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49
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50 // Grab my own PID
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51 String pid = Integer.toString(ProcessTools.getProcessId());
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52 ProcessBuilder pb = new ProcessBuilder();
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53
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54 // Verify that current tracking level is "detail"
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55 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
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56 output = new OutputAnalyzer(pb.start());
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57 output.shouldContain("Native Memory Tracking Statistics");
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58
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59 // Attempt to cause NMT to downgrade tracking level by allocating small amounts
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60 // of memory with random pseudo call stack
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61 int pc = 1;
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62 for (int i = 0; i < entries; i++) {
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63 long addr = wb.NMTMallocWithPseudoStack(1, pc);
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64 if (addr == 0) {
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65 throw new RuntimeException("NMTMallocWithPseudoStack: out of memory");
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66 }
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67 // We free memory here since it doesn't affect pseudo malloc alloc site hash table entries
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68 wb.NMTFree(addr);
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69 pc += MAX_HASH_SIZE;
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70 if (i == entries) {
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71 // Verify that tracking has been downgraded
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72 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
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73 output = new OutputAnalyzer(pb.start());
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74 output.shouldContain("Tracking level has been downgraded due to lack of resources");
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75 }
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76 }
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77 }
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78 }