102 lines
3.9 KiB
Java
102 lines
3.9 KiB
Java
/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import com.oracle.java.testlibrary.Utils;
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import java.lang.management.MemoryPoolMXBean;
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import javax.management.Notification;
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import sun.hotspot.WhiteBox;
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import sun.hotspot.code.BlobType;
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import sun.hotspot.code.CodeBlob;
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public final class CodeCacheUtils {
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/**
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* Returns the value to be used for code heap allocation
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*/
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public static final int ALLOCATION_SIZE
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= Integer.getInteger("codecache.allocation.size", 100);
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public static final WhiteBox WB = WhiteBox.getWhiteBox();
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public static final long SEGMENT_SIZE
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= WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheSegmentSize");
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public static final long MIN_BLOCK_LENGTH
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= WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheMinBlockLength");
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public static final long MIN_ALLOCATION = SEGMENT_SIZE * MIN_BLOCK_LENGTH;
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private CodeCacheUtils() {
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// To prevent from instantiation
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}
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public static final void hitUsageThreshold(MemoryPoolMXBean bean,
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BlobType btype) {
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long initialSize = bean.getUsage().getUsed();
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bean.setUsageThreshold(initialSize + 1);
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long usageThresholdCount = bean.getUsageThresholdCount();
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long addr = WB.allocateCodeBlob(1, btype.id);
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WB.fullGC();
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Utils.waitForCondition(()
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-> bean.getUsageThresholdCount() == usageThresholdCount + 1);
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WB.freeCodeBlob(addr);
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}
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public static final long getHeaderSize(BlobType btype) {
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long addr = WB.allocateCodeBlob(0, btype.id);
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int size = CodeBlob.getCodeBlob(addr).size;
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WB.freeCodeBlob(addr);
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return size;
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}
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public static String getPoolNameFromNotification(
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Notification notification) {
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return ((javax.management.openmbean.CompositeDataSupport)
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notification.getUserData()).get("poolName").toString();
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}
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public static boolean isAvailableCodeHeapPoolName(String name) {
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return BlobType.getAvailable().stream()
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.map(BlobType::getMemoryPool)
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.map(MemoryPoolMXBean::getName)
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.filter(name::equals)
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.findAny().isPresent();
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}
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/**
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* A "non-nmethods" code heap is used by interpreter during bytecode
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* execution, thus, it can't be predicted if this code heap usage will be
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* increased or not. Same goes for 'All'.
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*
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* @param btype BlobType to be checked
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* @return boolean value, true if respective code heap is predictable
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*/
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public static boolean isCodeHeapPredictable(BlobType btype) {
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return btype == BlobType.MethodNonProfiled
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|| btype == BlobType.MethodProfiled;
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}
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public static void disableCollectionUsageThresholds(){
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BlobType.getAvailable().stream()
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.map(BlobType::getMemoryPool)
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.filter(MemoryPoolMXBean::isCollectionUsageThresholdSupported)
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.forEach(b -> b.setCollectionUsageThreshold(0L));
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}
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}
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