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 /*
  26  * @test RandomAllocationTest
  27  * @key stress
  28  * @summary stressing code cache by allocating randomly sized "dummy" code blobs
  29  * @library /testlibrary /test/lib /
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  *
  33  * @build compiler.codecache.stress.RandomAllocationTest
  34  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  35  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  36  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  37  *                   -XX:+WhiteBoxAPI
  38  *                   -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method
  39  *                   -XX:-SegmentedCodeCache
  40  *                   compiler.codecache.stress.RandomAllocationTest
  41  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  42  *                   -XX:+WhiteBoxAPI
  43  *                   -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method
  44  *                   -XX:+SegmentedCodeCache
  45  *                   compiler.codecache.stress.RandomAllocationTest
  46  */
  47 
  48 package compiler.codecache.stress;
  49 
  50 import sun.hotspot.code.BlobType;
  51 
  52 import java.util.ArrayList;
  53 
  54 public class RandomAllocationTest implements Runnable {
  55     private static final long CODE_CACHE_SIZE
  56             = Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize");
  57     private static final int MAX_BLOB_SIZE = (int) (CODE_CACHE_SIZE >> 7);
  58     private static final BlobType[] BLOB_TYPES
  59             = BlobType.getAvailable().toArray(new BlobType[0]);
  60 
  61     public static void main(String[] args) {
  62         new CodeCacheStressRunner(new RandomAllocationTest()).runTest();
  63     }
  64 
  65     private final ArrayList<Long> blobs = new ArrayList<>();
  66     @Override
  67     public void run() {
  68         boolean allocate = blobs.isEmpty() || Helper.RNG.nextBoolean();
  69         if (allocate) {
  70             int type = Helper.RNG.nextInt(BLOB_TYPES.length);
  71             long addr = Helper.WHITE_BOX.allocateCodeBlob(
  72                     Helper.RNG.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id);
  73             if (addr != 0) {
  74                 blobs.add(addr);
  75             }
  76         } else {
  77             int index = Helper.RNG.nextInt(blobs.size());
  78             Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index));
  79         }
  80     }
  81 
  82 }