MallocSiteHashOverflow.java revision 8359:ed6389f70257 
1/*
2 * Copyright (c) 2014, 2015, 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 * @requires sun.arch.data.model == "32"
28 * @key nmt jcmd stress
29 * @library /testlibrary /../../test/lib
30 * @build MallocSiteHashOverflow
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
33 */
34
35import jdk.test.lib.*;
36import sun.hotspot.WhiteBox;
37
38public class MallocSiteHashOverflow {
39
40    public static void main(String args[]) throws Exception {
41
42        // Size of entries based on malloc tracking header defined in mallocTracker.hpp
43        // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
44        long entries = 257;
45
46        OutputAnalyzer output;
47        WhiteBox wb = WhiteBox.getWhiteBox();
48        int MAX_HASH_SIZE = wb.NMTGetHashSize();
49
50        // Grab my own PID
51        String pid = Integer.toString(ProcessTools.getProcessId());
52        ProcessBuilder pb = new ProcessBuilder();
53
54        // Verify that current tracking level is "detail"
55        pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
56        output = new OutputAnalyzer(pb.start());
57        output.shouldContain("Native Memory Tracking Statistics");
58
59        // Attempt to cause NMT to downgrade tracking level by allocating small amounts
60        // of memory with random pseudo call stack
61        int pc = 1;
62        for (int i = 0; i < entries; i++) {
63            long addr = wb.NMTMallocWithPseudoStack(1, pc);
64            if (addr == 0) {
65                throw new RuntimeException("NMTMallocWithPseudoStack: out of memory");
66            }
67            // We free memory here since it doesn't affect pseudo malloc alloc site hash table entries
68            wb.NMTFree(addr);
69            pc += MAX_HASH_SIZE;
70            if (i == entries) {
71                // Verify that tracking has been downgraded
72                pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
73                output = new OutputAnalyzer(pb.start());
74                output.shouldContain("Tracking level has been downgraded due to lack of resources");
75            }
76        }
77    }
78}
79