20394
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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 * @key stress
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26 * @test
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27 * @summary Test corner case that overflows malloc site hashtable bucket
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28 * @key nmt jcmd
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29 * @library /testlibrary /testlibrary/whitebox
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30 * @ignore - This test is disabled since it will stress NMT and timeout during normal testing
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31 * @build MallocSiteHashOverflow
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32 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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33 * @run main/othervm/timeout=480 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
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34 */
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35
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36 import com.oracle.java.testlibrary.*;
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37 import sun.hotspot.WhiteBox;
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38
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39 public class MallocSiteHashOverflow {
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40 private static long K = 1024;
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41 public static void main(String args[]) throws Exception {
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42 String vm_name = System.getProperty("java.vm.name");
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43
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44 // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
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45 // For 64-bit systems, create 64K + 1 malloc sites with the same hash bucket to overflow a hash bucket
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46 long entries = 257;
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47 if (Platform.is64bit()) {
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48 entries = 64 * K + 1;
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49 }
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50
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51 OutputAnalyzer output;
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52 WhiteBox wb = WhiteBox.getWhiteBox();
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53
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54 // Grab my own PID
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55 String pid = Integer.toString(ProcessTools.getProcessId());
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56 ProcessBuilder pb = new ProcessBuilder();
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57
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58 wb.NMTOverflowHashBucket(entries);
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59
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60 // Run 'jcmd <pid> VM.native_memory summary'
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61 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
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62 output = new OutputAnalyzer(pb.start());
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63 output.shouldContain("Tracking level has been downgraded due to lack of resources");
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64 }
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65 }
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