| /* |
| * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @summary Test corner case that overflows malloc site hashtable bucket |
| * @requires sun.arch.data.model == "32" |
| * @key nmt jcmd stress |
| * @library /testlibrary /testlibrary/whitebox |
| * @build MallocSiteHashOverflow |
| * @run main ClassFileInstaller sun.hotspot.WhiteBox |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow |
| */ |
| |
| import com.oracle.java.testlibrary.*; |
| import sun.hotspot.WhiteBox; |
| |
| public class MallocSiteHashOverflow { |
| |
| public static void main(String args[]) throws Exception { |
| |
| // Size of entries based on malloc tracking header defined in mallocTracker.hpp |
| // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket |
| long entries = 257; |
| |
| OutputAnalyzer output; |
| WhiteBox wb = WhiteBox.getWhiteBox(); |
| int MAX_HASH_SIZE = wb.NMTGetHashSize(); |
| |
| // Grab my own PID |
| String pid = Integer.toString(ProcessTools.getProcessId()); |
| ProcessBuilder pb = new ProcessBuilder(); |
| |
| // Verify that current tracking level is "detail" |
| pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"}); |
| output = new OutputAnalyzer(pb.start()); |
| output.shouldContain("Native Memory Tracking Statistics"); |
| |
| // Attempt to cause NMT to downgrade tracking level by allocating small amounts |
| // of memory with random pseudo call stack |
| int pc = 1; |
| for (int i = 0; i < entries; i++) { |
| long addr = wb.NMTMallocWithPseudoStack(1, pc); |
| if (addr == 0) { |
| throw new RuntimeException("NMTMallocWithPseudoStack: out of memory"); |
| } |
| // We free memory here since it doesn't affect pseudo malloc alloc site hash table entries |
| wb.NMTFree(addr); |
| pc += MAX_HASH_SIZE; |
| if (i == entries) { |
| // Verify that tracking has been downgraded |
| pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"}); |
| output = new OutputAnalyzer(pb.start()); |
| output.shouldContain("Tracking level has been downgraded due to lack of resources"); |
| } |
| } |
| } |
| } |