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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License. You may obtain a
* copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package org.apache.geode.internal.offheap;
import org.apache.geode.cache.CacheClosedException;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.RegionService;
import org.apache.geode.distributed.internal.DistributionConfig;
import org.apache.geode.internal.cache.*;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.internal.offheap.annotations.OffHeapIdentifier;
import org.apache.geode.internal.offheap.annotations.Unretained;
import org.apache.logging.log4j.Logger;
import java.util.*;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* This allocator is somewhat like an Arena allocator. We start out with an array of multiple large
* chunks of memory. We also keep lists of any chunk that have been allocated and freed. An
* allocation will always try to find a chunk in a free list that is a close fit to the requested
* size. If no close fits exist then it allocates the next slice from the front of one the original
* large chunks. If we can not find enough free memory then all the existing free memory is
* defragmented. If we still do not have enough to make the allocation an exception is thrown.
*
* @since Geode 1.0
*/
public class MemoryAllocatorImpl implements MemoryAllocator {
static final Logger logger = LogService.getLogger();
public static final String FREE_OFF_HEAP_MEMORY_PROPERTY =
DistributionConfig.GEMFIRE_PREFIX + "free-off-heap-memory";
private volatile OffHeapMemoryStats stats;
private volatile OutOfOffHeapMemoryListener ooohml;
OutOfOffHeapMemoryListener getOutOfOffHeapMemoryListener() {
return this.ooohml;
}
public final FreeListManager freeList;
private MemoryInspector memoryInspector;
private volatile MemoryUsageListener[] memoryUsageListeners = new MemoryUsageListener[0];
private static MemoryAllocatorImpl singleton = null;
public static MemoryAllocatorImpl getAllocator() {
MemoryAllocatorImpl result = singleton;
if (result == null) {
throw new CacheClosedException("Off Heap memory allocator does not exist.");
}
return result;
}
private static final boolean DO_EXPENSIVE_VALIDATION =
Boolean.getBoolean(DistributionConfig.GEMFIRE_PREFIX + "OFF_HEAP_DO_EXPENSIVE_VALIDATION");
public static MemoryAllocator create(OutOfOffHeapMemoryListener ooohml, OffHeapMemoryStats stats,
int slabCount, long offHeapMemorySize, long maxSlabSize) {
return create(ooohml, stats, slabCount, offHeapMemorySize, maxSlabSize, null,
new SlabFactory() {
@Override
public Slab create(int size) {
return new SlabImpl(size);
}
});
}
private static MemoryAllocatorImpl create(OutOfOffHeapMemoryListener ooohml,
OffHeapMemoryStats stats, int slabCount, long offHeapMemorySize, long maxSlabSize,
Slab[] slabs, SlabFactory slabFactory) {
MemoryAllocatorImpl result = singleton;
boolean created = false;
try {
if (result != null) {
result.reuse(ooohml, stats, offHeapMemorySize, slabs);
logger.info(
"Reusing {} bytes of off-heap memory. The maximum size of a single off-heap object is {} bytes.",
result.getTotalMemory(), result.freeList.getLargestSlabSize());
created = true;
LifecycleListener.invokeAfterReuse(result);
} else {
if (slabs == null) {
// allocate memory chunks
logger.info(
"Allocating {} bytes of off-heap memory. The maximum size of a single off-heap object is {} bytes.",
offHeapMemorySize, maxSlabSize);
slabs = new SlabImpl[slabCount];
long uncreatedMemory = offHeapMemorySize;
for (int i = 0; i < slabCount; i++) {
try {
if (uncreatedMemory >= maxSlabSize) {
slabs[i] = slabFactory.create((int) maxSlabSize);
uncreatedMemory -= maxSlabSize;
} else {
// the last slab can be smaller then maxSlabSize
slabs[i] = slabFactory.create((int) uncreatedMemory);
}
} catch (OutOfMemoryError err) {
if (i > 0) {
logger.error(
"Off-heap memory creation failed after successfully allocating {} bytes of off-heap memory.",
(i * maxSlabSize));
}
for (int j = 0; j < i; j++) {
if (slabs[j] != null) {
slabs[j].free();
}
}
throw err;
}
}
}
result = new MemoryAllocatorImpl(ooohml, stats, slabs);
singleton = result;
LifecycleListener.invokeAfterCreate(result);
created = true;
}
} finally {
if (!created) {
if (stats != null) {
stats.close();
}
if (ooohml != null) {
ooohml.close();
}
}
}
return result;
}
static MemoryAllocatorImpl createForUnitTest(OutOfOffHeapMemoryListener ooohml,
OffHeapMemoryStats stats, int slabCount, long offHeapMemorySize, long maxSlabSize,
SlabFactory memChunkFactory) {
return create(ooohml, stats, slabCount, offHeapMemorySize, maxSlabSize, null, memChunkFactory);
}
public static MemoryAllocatorImpl createForUnitTest(OutOfOffHeapMemoryListener oooml,
OffHeapMemoryStats stats, Slab[] slabs) {
int slabCount = 0;
long offHeapMemorySize = 0;
long maxSlabSize = 0;
if (slabs != null) {
slabCount = slabs.length;
for (int i = 0; i < slabCount; i++) {
int slabSize = slabs[i].getSize();
offHeapMemorySize += slabSize;
if (slabSize > maxSlabSize) {
maxSlabSize = slabSize;
}
}
}
return create(oooml, stats, slabCount, offHeapMemorySize, maxSlabSize, slabs, null);
}
private void reuse(OutOfOffHeapMemoryListener oooml, OffHeapMemoryStats newStats,
long offHeapMemorySize, Slab[] slabs) {
if (isClosed()) {
throw new IllegalStateException("Can not reuse a closed off-heap memory manager.");
}
if (oooml == null) {
throw new IllegalArgumentException("OutOfOffHeapMemoryListener is null");
}
if (getTotalMemory() != offHeapMemorySize) {
logger.warn("Using {} bytes of existing off-heap memory instead of the requested {}.",
getTotalMemory(), offHeapMemorySize);
}
if (!this.freeList.okToReuse(slabs)) {
throw new IllegalStateException(
"attempted to reuse existing off-heap memory even though new off-heap memory was allocated");
}
this.ooohml = oooml;
newStats.initialize(this.stats);
this.stats = newStats;
}
private MemoryAllocatorImpl(final OutOfOffHeapMemoryListener oooml,
final OffHeapMemoryStats stats, final Slab[] slabs) {
if (oooml == null) {
throw new IllegalArgumentException("OutOfOffHeapMemoryListener is null");
}
this.ooohml = oooml;
this.stats = stats;
this.stats.setFragments(slabs.length);
this.stats.setLargestFragment(slabs[0].getSize());
this.freeList = new FreeListManager(this, slabs);
this.memoryInspector = new MemoryInspectorImpl(this.freeList);
this.stats.incMaxMemory(this.freeList.getTotalMemory());
this.stats.incFreeMemory(this.freeList.getTotalMemory());
}
public List getLostChunks() {
List liveChunks = this.freeList.getLiveChunks();
List regionChunks = getRegionLiveChunks();
Set liveChunksSet = new HashSet<>(liveChunks);
Set regionChunksSet = new HashSet<>(regionChunks);
liveChunksSet.removeAll(regionChunksSet);
return new ArrayList(liveChunksSet);
}
/**
* Returns a possibly empty list that contains all the Chunks used by regions.
*/
private List getRegionLiveChunks() {
ArrayList result = new ArrayList();
RegionService gfc = GemFireCacheImpl.getInstance();
if (gfc != null) {
Iterator> rootIt = gfc.rootRegions().iterator();
while (rootIt.hasNext()) {
Region rr = rootIt.next();
getRegionLiveChunks(rr, result);
Iterator> srIt = rr.subregions(true).iterator();
while (srIt.hasNext()) {
getRegionLiveChunks(srIt.next(), result);
}
}
}
return result;
}
private void getRegionLiveChunks(Region r, List result) {
if (r.getAttributes().getOffHeap()) {
if (r instanceof PartitionedRegion) {
PartitionedRegionDataStore prs = ((PartitionedRegion) r).getDataStore();
if (prs != null) {
Set brs = prs.getAllLocalBucketRegions();
if (brs != null) {
for (BucketRegion br : brs) {
if (br != null && !br.isDestroyed()) {
this.basicGetRegionLiveChunks(br, result);
}
}
}
}
} else {
this.basicGetRegionLiveChunks((LocalRegion) r, result);
}
}
}
private void basicGetRegionLiveChunks(LocalRegion r, List result) {
for (Object key : r.keySet()) {
RegionEntry re = ((LocalRegion) r).getRegionEntry(key);
if (re != null) {
/**
* value could be GATEWAY_SENDER_EVENT_IMPL_VALUE or region entry value.
*/
@Unretained(OffHeapIdentifier.GATEWAY_SENDER_EVENT_IMPL_VALUE)
Object value = re._getValue();
if (value instanceof OffHeapStoredObject) {
result.add((OffHeapStoredObject) value);
}
}
}
}
private OffHeapStoredObject allocateOffHeapStoredObject(int size) {
OffHeapStoredObject result = this.freeList.allocate(size);
int resultSize = result.getSize();
stats.incObjects(1);
stats.incUsedMemory(resultSize);
stats.incFreeMemory(-resultSize);
notifyListeners();
if (ReferenceCountHelper.trackReferenceCounts()) {
ReferenceCountHelper.refCountChanged(result.getAddress(), false, 1);
}
return result;
}
@Override
public StoredObject allocate(int size) {
// System.out.println("allocating " + size);
OffHeapStoredObject result = allocateOffHeapStoredObject(size);
// ("allocated off heap object of size " + size + " @" +
// Long.toHexString(result.getMemoryAddress()), true);
return result;
}
public static void debugLog(String msg, boolean logStack) {
if (logStack) {
logger.info(msg, new RuntimeException(msg));
} else {
logger.info(msg);
}
}
@Override
public StoredObject allocateAndInitialize(byte[] v, boolean isSerialized, boolean isCompressed) {
return allocateAndInitialize(v, isSerialized, isCompressed, null);
}
@Override
public StoredObject allocateAndInitialize(byte[] v, boolean isSerialized, boolean isCompressed,
byte[] originalHeapData) {
long addr = OffHeapRegionEntryHelper.encodeDataAsAddress(v, isSerialized, isCompressed);
if (addr != 0L) {
return new TinyStoredObject(addr);
}
OffHeapStoredObject result = allocateOffHeapStoredObject(v.length);
// debugLog("allocated off heap object of size " + v.length + " @" +
// Long.toHexString(result.getMemoryAddress()), true);
// debugLog("allocated off heap object of size " + v.length + " @" +
// Long.toHexString(result.getMemoryAddress()) + "chunkSize=" + result.getSize() + "
// isSerialized=" + isSerialized + " v=" + Arrays.toString(v), true);
result.setSerializedValue(v);
result.setSerialized(isSerialized);
result.setCompressed(isCompressed);
if (originalHeapData != null) {
result = new OffHeapStoredObjectWithHeapForm(result, originalHeapData);
}
return result;
}
@Override
public long getFreeMemory() {
return this.freeList.getFreeMemory();
}
@Override
public long getUsedMemory() {
return this.freeList.getUsedMemory();
}
@Override
public long getTotalMemory() {
return this.freeList.getTotalMemory();
}
@Override
public void close() {
try {
LifecycleListener.invokeBeforeClose(this);
} finally {
this.ooohml.close();
if (Boolean.getBoolean(FREE_OFF_HEAP_MEMORY_PROPERTY)) {
realClose();
}
}
}
public static void freeOffHeapMemory() {
MemoryAllocatorImpl ma = singleton;
if (ma != null) {
ma.realClose();
}
}
private void realClose() {
// Removing this memory immediately can lead to a SEGV. See 47885.
if (setClosed()) {
this.freeList.freeSlabs();
this.stats.close();
singleton = null;
}
}
private final AtomicBoolean closed = new AtomicBoolean();
private boolean isClosed() {
return this.closed.get();
}
/**
* Returns true if caller is the one who should close; false if some other thread is already
* closing.
*/
private boolean setClosed() {
return this.closed.compareAndSet(false, true);
}
FreeListManager getFreeListManager() {
return this.freeList;
}
/**
* Return the slabId of the slab that contains the given addr.
*/
int findSlab(long addr) {
return this.freeList.findSlab(addr);
}
public OffHeapMemoryStats getStats() {
return this.stats;
}
@Override
public void addMemoryUsageListener(final MemoryUsageListener listener) {
synchronized (this.memoryUsageListeners) {
final MemoryUsageListener[] newMemoryUsageListeners =
Arrays.copyOf(this.memoryUsageListeners, this.memoryUsageListeners.length + 1);
newMemoryUsageListeners[this.memoryUsageListeners.length] = listener;
this.memoryUsageListeners = newMemoryUsageListeners;
}
}
@Override
public void removeMemoryUsageListener(final MemoryUsageListener listener) {
synchronized (this.memoryUsageListeners) {
int listenerIndex = -1;
for (int i = 0; i < this.memoryUsageListeners.length; i++) {
if (this.memoryUsageListeners[i] == listener) {
listenerIndex = i;
break;
}
}
if (listenerIndex != -1) {
final MemoryUsageListener[] newMemoryUsageListeners =
new MemoryUsageListener[this.memoryUsageListeners.length - 1];
System.arraycopy(this.memoryUsageListeners, 0, newMemoryUsageListeners, 0, listenerIndex);
System.arraycopy(this.memoryUsageListeners, listenerIndex + 1, newMemoryUsageListeners,
listenerIndex, this.memoryUsageListeners.length - listenerIndex - 1);
this.memoryUsageListeners = newMemoryUsageListeners;
}
}
}
void notifyListeners() {
final MemoryUsageListener[] savedListeners = this.memoryUsageListeners;
if (savedListeners.length == 0) {
return;
}
final long bytesUsed = getUsedMemory();
for (int i = 0; i < savedListeners.length; i++) {
savedListeners[i].updateMemoryUsed(bytesUsed);
}
}
static void validateAddress(long addr) {
validateAddressAndSize(addr, -1);
}
static void validateAddressAndSize(long addr, int size) {
// if the caller does not have a "size" to provide then use -1
if ((addr & 7) != 0) {
StringBuilder sb = new StringBuilder();
sb.append("address was not 8 byte aligned: 0x").append(Long.toString(addr, 16));
MemoryAllocatorImpl ma = MemoryAllocatorImpl.singleton;
if (ma != null) {
sb.append(". Valid addresses must be in one of the following ranges: ");
ma.freeList.getSlabDescriptions(sb);
}
throw new IllegalStateException(sb.toString());
}
if (addr >= 0 && addr < 1024) {
throw new IllegalStateException("addr was smaller than expected 0x" + addr);
}
validateAddressAndSizeWithinSlab(addr, size, DO_EXPENSIVE_VALIDATION);
}
static void validateAddressAndSizeWithinSlab(long addr, int size, boolean doExpensiveValidation) {
if (doExpensiveValidation) {
MemoryAllocatorImpl ma = MemoryAllocatorImpl.singleton;
if (ma != null) {
if (!ma.freeList.validateAddressAndSizeWithinSlab(addr, size)) {
throw new IllegalStateException(" address 0x" + Long.toString(addr, 16)
+ " does not address the original slab memory");
}
}
}
}
public synchronized List getOrphans() {
List liveChunks = this.freeList.getLiveChunks();
List regionChunks = getRegionLiveChunks();
liveChunks.removeAll(regionChunks);
List orphans = new ArrayList();
for (OffHeapStoredObject chunk : liveChunks) {
orphans.add(new MemoryBlockNode(this, chunk));
}
Collections.sort(orphans, new Comparator() {
@Override
public int compare(MemoryBlock o1, MemoryBlock o2) {
return Long.valueOf(o1.getAddress()).compareTo(o2.getAddress());
}
});
// this.memoryBlocks = new WeakReference>(orphans);
return orphans;
}
@Override
public MemoryInspector getMemoryInspector() {
return this.memoryInspector;
}
}