Mercurial > hg > graal-jvmci-8
annotate test/runtime/NMT/MallocSiteHashOverflow.java @ 24006:44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
Summary: Remove MAP_FIXED from initial mapping allocation; add tests
Reviewed-by: stefank, coleenp
author | stuefe |
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date | Thu, 23 Apr 2015 18:00:50 +0200 |
parents | ec2c6fdd1ce6 |
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rev | line source |
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20394 | 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 | |
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27 * @requires sun.arch.data.model == "32" |
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28 * @key nmt jcmd stress |
20394 | 29 * @library /testlibrary /testlibrary/whitebox |
30 * @build MallocSiteHashOverflow | |
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox | |
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32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow |
20394 | 33 */ |
34 | |
35 import com.oracle.java.testlibrary.*; | |
36 import sun.hotspot.WhiteBox; | |
37 | |
38 public class MallocSiteHashOverflow { | |
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39 |
20394 | 40 public static void main(String args[]) throws Exception { |
41 | |
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42 // Size of entries based on malloc tracking header defined in mallocTracker.hpp |
20394 | 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(); | |
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48 int MAX_HASH_SIZE = wb.NMTGetHashSize(); |
20394 | 49 |
50 // Grab my own PID | |
51 String pid = Integer.toString(ProcessTools.getProcessId()); | |
52 ProcessBuilder pb = new ProcessBuilder(); | |
53 | |
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54 // Verify that current tracking level is "detail" |
20394 | 55 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"}); |
56 output = new OutputAnalyzer(pb.start()); | |
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57 output.shouldContain("Native Memory Tracking Statistics"); |
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58 |
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59 // Attempt to cause NMT to downgrade tracking level by allocating small amounts |
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60 // of memory with random pseudo call stack |
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61 int pc = 1; |
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62 for (int i = 0; i < entries; i++) { |
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63 long addr = wb.NMTMallocWithPseudoStack(1, pc); |
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64 if (addr == 0) { |
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65 throw new RuntimeException("NMTMallocWithPseudoStack: out of memory"); |
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66 } |
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67 // We free memory here since it doesn't affect pseudo malloc alloc site hash table entries |
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68 wb.NMTFree(addr); |
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69 pc += MAX_HASH_SIZE; |
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70 if (i == entries) { |
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71 // Verify that tracking has been downgraded |
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72 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"}); |
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73 output = new OutputAnalyzer(pb.start()); |
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74 output.shouldContain("Tracking level has been downgraded due to lack of resources"); |
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75 } |
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76 } |
20394 | 77 } |
78 } |