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view test/runtime/NMT/MallocSiteHashOverflow.java @ 22296:11c97c1d824a
Use new c1visualizer (updated disassembler)
author | Stefan Anzinger <stefan.anzinger@oracle.com> |
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date | Wed, 22 Jul 2015 14:37:17 +0200 |
parents | ec2c6fdd1ce6 |
children |
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/* * 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"); } } } }