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 }