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view agent/src/share/classes/sun/jvm/hotspot/memory/CompactibleFreeListSpace.java @ 17716:cdb71841f4bc
6498581: ThreadInterruptTest3 produces wrong output on Windows
Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set.
Reviewed-by: acorn, kvn
Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
author | minqi |
---|---|
date | Wed, 26 Feb 2014 15:20:41 -0800 |
parents | 49618582fc5b |
children | f6490a5f084a |
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/* * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.memory; import java.io.*; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; import sun.jvm.hotspot.utilities.*; public class CompactibleFreeListSpace extends CompactibleSpace { private static AddressField collectorField; // for free size, three fields // FreeBlockDictionary* _dictionary; // ptr to dictionary for large size blocks // FreeList _indexedFreeList[IndexSetSize]; // indexed array for small size blocks // LinearAllocBlock _smallLinearAllocBlock; // small linear alloc in TLAB private static AddressField indexedFreeListField; private static AddressField dictionaryField; private static long smallLinearAllocBlockFieldOffset; private static long indexedFreeListSizeOf; private int heapWordSize; // 4 for 32bit, 8 for 64 bits private int IndexSetStart; // for small indexed list private int IndexSetSize; private int IndexSetStride; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { long sizeofFreeChunk = db.lookupType("FreeChunk").getSize(); VM vm = VM.getVM(); MinChunkSizeInBytes = numQuanta(sizeofFreeChunk, vm.getMinObjAlignmentInBytes()) * vm.getMinObjAlignmentInBytes(); Type type = db.lookupType("CompactibleFreeListSpace"); collectorField = type.getAddressField("_collector"); collectorField = type.getAddressField("_collector"); dictionaryField = type.getAddressField("_dictionary"); indexedFreeListField = type.getAddressField("_indexedFreeList[0]"); smallLinearAllocBlockFieldOffset = type.getField("_smallLinearAllocBlock").getOffset(); } public CompactibleFreeListSpace(Address addr) { super(addr); VM vm = VM.getVM(); heapWordSize = vm.getHeapWordSize(); IndexSetStart = vm.getMinObjAlignmentInBytes() / heapWordSize; IndexSetStride = IndexSetStart; IndexSetSize = 257; } // Accessing block offset table public CMSCollector collector() { return (CMSCollector) VMObjectFactory.newObject( CMSCollector.class, collectorField.getValue(addr)); } public long free0() { return capacity() - used0(); } public long used() { return capacity() - free(); } public long used0() { List regions = getLiveRegions(); long usedSize = 0L; for (Iterator itr = regions.iterator(); itr.hasNext();) { MemRegion mr = (MemRegion) itr.next(); usedSize += mr.byteSize(); } return usedSize; } public long free() { // small chunks long size = 0; Address cur = addr.addOffsetTo( indexedFreeListField.getOffset() ); cur = cur.addOffsetTo(IndexSetStart*FreeList.sizeOf()); for (int i=IndexSetStart; i<IndexSetSize; i += IndexSetStride) { FreeList freeList = (FreeList) VMObjectFactory.newObject(FreeList.class, cur); size += i*freeList.count(); cur= cur.addOffsetTo(IndexSetStride*FreeList.sizeOf()); } // large block AFLBinaryTreeDictionary aflbd = (AFLBinaryTreeDictionary) VMObjectFactory.newObject(AFLBinaryTreeDictionary.class, dictionaryField.getValue(addr)); size += aflbd.size(); // linear block in TLAB LinearAllocBlock lab = (LinearAllocBlock) VMObjectFactory.newObject(LinearAllocBlock.class, addr.addOffsetTo(smallLinearAllocBlockFieldOffset)); size += lab.word_size(); return size*heapWordSize; } public void printOn(PrintStream tty) { tty.print("free-list-space"); tty.print("[ " + bottom() + " , " + end() + " ) "); long cap = capacity(); long used_size = used(); long free_size = free(); int used_perc = (int)((double)used_size/cap*100); tty.print("space capacity = " + cap + " used(" + used_perc + "%)= " + used_size + " "); tty.print("free= " + free_size ); tty.print("\n"); } public Address skipBlockSizeUsingPrintezisBits(Address pos) { CMSCollector collector = collector(); long size = 0; Address addr = null; if (collector != null) { size = collector.blockSizeUsingPrintezisBits(pos); if (size >= 3) { addr = pos.addOffsetTo(adjustObjectSizeInBytes(size)); } } return addr; } public List/*<MemRegion>*/ getLiveRegions() { List res = new ArrayList(); // List<MemRegion> VM vm = VM.getVM(); Debugger dbg = vm.getDebugger(); ObjectHeap heap = vm.getObjectHeap(); Address cur = bottom(); Address regionStart = cur; Address limit = end(); final long addressSize = vm.getAddressSize(); for (; cur.lessThan(limit);) { Address k = cur.getAddressAt(addressSize); if (FreeChunk.indicatesFreeChunk(cur)) { if (! cur.equals(regionStart)) { res.add(new MemRegion(regionStart, cur)); } FreeChunk fc = (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, cur); long chunkSize = fc.size(); if (Assert.ASSERTS_ENABLED) { Assert.that(chunkSize > 0, "invalid FreeChunk size"); } // note that fc.size() gives chunk size in heap words cur = cur.addOffsetTo(chunkSize * addressSize); regionStart = cur; } else if (k != null) { Oop obj = heap.newOop(cur.addOffsetToAsOopHandle(0)); long objectSize = obj.getObjectSize(); cur = cur.addOffsetTo(adjustObjectSizeInBytes(objectSize)); } else { // FIXME: need to do a better job here. // can I use bitMap here? //Find the object size using Printezis bits and skip over long size = collector().blockSizeUsingPrintezisBits(cur); if (size == -1) { break; } cur = cur.addOffsetTo(adjustObjectSizeInBytes(size)); } } return res; } //-- Internals only below this point // Unlike corresponding VM code, we operate on byte size rather than // HeapWord size for convenience. private static long numQuanta(long x, long y) { return ((x+y-1)/y); } public static long adjustObjectSizeInBytes(long sizeInBytes) { return Oop.alignObjectSize(Math.max(sizeInBytes, MinChunkSizeInBytes)); } // FIXME: should I read this directly from VM? private static long MinChunkSizeInBytes; }