82 lines
3.4 KiB
Java
82 lines
3.4 KiB
Java
/*
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* Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary Test corner case that overflows malloc site hashtable bucket
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* @requires sun.arch.data.model == "32"
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* @key stress
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* @modules java.base/jdk.internal.misc
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
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*/
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import jdk.test.lib.JDKToolFinder;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.whitebox.WhiteBox;
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public class MallocSiteHashOverflow {
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public static void main(String args[]) throws Exception {
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// Size of entries based on malloc tracking header defined in mallocTracker.hpp
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// For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
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long entries = 257;
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OutputAnalyzer output;
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WhiteBox wb = WhiteBox.getWhiteBox();
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int MAX_HASH_SIZE = wb.NMTGetHashSize();
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// Grab my own PID
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String pid = Long.toString(ProcessTools.getProcessId());
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ProcessBuilder pb = new ProcessBuilder();
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// Verify that current tracking level is "detail"
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pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
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output = new OutputAnalyzer(pb.start());
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output.shouldContain("Native Memory Tracking Statistics");
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// Attempt to cause NMT to downgrade tracking level by allocating small amounts
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// of memory with random pseudo call stack
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int pc = 1;
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for (int i = 0; i < entries; i++) {
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long addr = wb.NMTMallocWithPseudoStack(1, pc);
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if (addr == 0) {
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throw new RuntimeException("NMTMallocWithPseudoStack: out of memory");
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}
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// We free memory here since it doesn't affect pseudo malloc alloc site hash table entries
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wb.NMTFree(addr);
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pc += MAX_HASH_SIZE;
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if (i == entries) {
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// Verify that tracking has been downgraded
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pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
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output = new OutputAnalyzer(pb.start());
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output.shouldContain("Tracking level has been downgraded due to lack of resources");
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}
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}
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}
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}
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