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 }