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