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 import com.oracle.java.testlibrary.Utils; 25 import java.lang.management.MemoryPoolMXBean; 26 import javax.management.Notification; 27 import sun.hotspot.WhiteBox; 28 import sun.hotspot.code.BlobType; 29 import sun.hotspot.code.CodeBlob; 30 31 public final class CodeCacheUtils { 32 33 /** 34 * Returns the value to be used for code heap allocation 35 */ 36 public static final int ALLOCATION_SIZE 37 = Integer.getInteger("codecache.allocation.size", 100); 38 public static final WhiteBox WB = WhiteBox.getWhiteBox(); 39 public static final long SEGMENT_SIZE 40 = WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheSegmentSize"); 41 public static final long MIN_BLOCK_LENGTH 42 = WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheMinBlockLength"); 43 public static final long MIN_ALLOCATION = SEGMENT_SIZE * MIN_BLOCK_LENGTH; 44 45 private CodeCacheUtils() { 46 // To prevent from instantiation 47 } 48 49 public static final void hitUsageThreshold(MemoryPoolMXBean bean, 50 BlobType btype) { 51 long initialSize = bean.getUsage().getUsed(); 52 bean.setUsageThreshold(initialSize + 1); 53 long usageThresholdCount = bean.getUsageThresholdCount(); 54 long addr = WB.allocateCodeBlob(1, btype.id); 55 WB.fullGC(); 56 Utils.waitForCondition(() 57 -> bean.getUsageThresholdCount() == usageThresholdCount + 1); 58 WB.freeCodeBlob(addr); 59 } 60 61 public static final long getHeaderSize(BlobType btype) { 62 long addr = WB.allocateCodeBlob(0, btype.id); 63 int size = CodeBlob.getCodeBlob(addr).size; 64 WB.freeCodeBlob(addr); 65 return size; 66 } 67 68 public static String getPoolNameFromNotification( 69 Notification notification) { 70 return ((javax.management.openmbean.CompositeDataSupport) 71 notification.getUserData()).get("poolName").toString(); 72 } 73 74 public static boolean isAvailableCodeHeapPoolName(String name) { 75 return BlobType.getAvailable().stream() 76 .map(BlobType::getMemoryPool) 77 .map(MemoryPoolMXBean::getName) 78 .filter(name::equals) 79 .findAny().isPresent(); 80 } 81 82 /** 83 * A "non-nmethods" code heap is used by interpreter during bytecode 84 * execution, thus, it can't be predicted if this code heap usage will be 85 * increased or not. Same goes for 'All'. 86 * 87 * @param btype BlobType to be checked 88 * @return boolean value, true if respective code heap is predictable 89 */ 90 public static boolean isCodeHeapPredictable(BlobType btype) { 91 return btype == BlobType.MethodNonProfiled 92 || btype == BlobType.MethodProfiled; 93 } 94 95 public static void disableCollectionUsageThresholds(){ 96 BlobType.getAvailable().stream() 97 .map(BlobType::getMemoryPool) 98 .filter(MemoryPoolMXBean::isCollectionUsageThresholdSupported) 99 .forEach(b -> b.setCollectionUsageThreshold(0L)); 100 } 101 }