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 import jdk.test.lib.Asserts; 25 import jdk.test.lib.Utils; 26 import java.lang.management.MemoryPoolMXBean; 27 import javax.management.Notification; 28 import sun.hotspot.WhiteBox; 29 import sun.hotspot.code.BlobType; 30 import sun.hotspot.code.CodeBlob; 31 32 public final class CodeCacheUtils { 33 34 /** 35 * Returns the value to be used for code heap allocation 36 */ 37 public static final int ALLOCATION_SIZE 38 = Integer.getInteger("codecache.allocation.size", 100); 39 public static final WhiteBox WB = WhiteBox.getWhiteBox(); 40 public static final long SEGMENT_SIZE 41 = WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheSegmentSize"); 42 public static final long MIN_BLOCK_LENGTH 43 = WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheMinBlockLength"); 44 public static final long MIN_ALLOCATION = SEGMENT_SIZE * MIN_BLOCK_LENGTH; 45 46 private CodeCacheUtils() { 47 // To prevent from instantiation 48 } 49 50 public static final void hitUsageThreshold(MemoryPoolMXBean bean, 51 BlobType btype) { 52 long initialSize = bean.getUsage().getUsed(); 53 bean.setUsageThreshold(initialSize + 1); 54 long usageThresholdCount = bean.getUsageThresholdCount(); 55 long addr = WB.allocateCodeBlob(1, btype.id); 56 WB.fullGC(); 57 Utils.waitForCondition(() 58 -> bean.getUsageThresholdCount() == usageThresholdCount + 1); 59 WB.freeCodeBlob(addr); 60 } 61 62 public static final long getHeaderSize(BlobType btype) { 63 long addr = WB.allocateCodeBlob(0, btype.id); 64 int size = CodeBlob.getCodeBlob(addr).size; 65 WB.freeCodeBlob(addr); 66 return size; 67 } 68 69 public static String getPoolNameFromNotification( 70 Notification notification) { 71 return ((javax.management.openmbean.CompositeDataSupport) 72 notification.getUserData()).get("poolName").toString(); 73 } 74 75 public static boolean isAvailableCodeHeapPoolName(String name) { 76 return BlobType.getAvailable().stream() 77 .map(BlobType::getMemoryPool) 78 .map(MemoryPoolMXBean::getName) 79 .filter(name::equals) 80 .findAny().isPresent(); 81 } 82 83 /** 84 * Checks if the usage of the code heap corresponding to 'btype' can be 85 * predicted at runtime if we disable compilation. The usage of the 86 * 'NonNMethod' code heap can not be predicted because we generate adapters 87 * and buffers at runtime. The 'MethodNonProfiled' code heap is also not 88 * predictable because we may generate compiled versions of method handle 89 * intrinsics while resolving methods at runtime. Same applies to 'All'. 90 * 91 * @param btype BlobType to be checked 92 * @return boolean value, true if respective code heap is predictable 93 */ 94 public static boolean isCodeHeapPredictable(BlobType btype) { 95 return btype == BlobType.MethodProfiled; 96 } 97 98 /** 99 * Verifies that 'newValue' is equal to 'oldValue' if usage of the 100 * corresponding code heap is predictable. Checks the weaker condition 101 * 'newValue >= oldValue' if usage is not predictable because intermediate 102 * allocations may happen. 103 * 104 * @param btype BlobType of the code heap to be checked 105 * @param newValue New value to be verified 106 * @param oldValue Old value to be verified 107 * @param msg Error message if verification fails 108 */ 109 public static void assertEQorGTE(BlobType btype, long newValue, long oldValue, String msg) { 110 if (CodeCacheUtils.isCodeHeapPredictable(btype)) { 111 // Usage is predictable, check strong == condition 112 Asserts.assertEQ(newValue, oldValue, msg); 113 } else { 114 // Usage is not predictable, check weaker >= condition 115 Asserts.assertGTE(newValue, oldValue, msg); 116 } 117 } 118 119 public static void disableCollectionUsageThresholds() { 120 BlobType.getAvailable().stream() 121 .map(BlobType::getMemoryPool) 122 .filter(MemoryPoolMXBean::isCollectionUsageThresholdSupported) 123 .forEach(b -> b.setCollectionUsageThreshold(0L)); 124 } 125 }