687 lines
23 KiB
Java
687 lines
23 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer;
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import io.netty.util.internal.LongCounter;
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import io.netty.util.internal.PlatformDependent;
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import io.netty.util.internal.StringUtil;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicInteger;
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import static io.netty.buffer.PoolChunk.isSubpage;
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import static java.lang.Math.max;
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abstract class PoolArena<T> extends SizeClasses implements PoolArenaMetric {
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static final boolean HAS_UNSAFE = PlatformDependent.hasUnsafe();
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enum SizeClass {
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Small,
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Normal
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}
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final PooledByteBufAllocator parent;
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final int numSmallSubpagePools;
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final int directMemoryCacheAlignment;
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final int directMemoryCacheAlignmentMask;
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private final PoolSubpage<T>[] smallSubpagePools;
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private final PoolChunkList<T> q050;
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private final PoolChunkList<T> q025;
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private final PoolChunkList<T> q000;
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private final PoolChunkList<T> qInit;
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private final PoolChunkList<T> q075;
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private final PoolChunkList<T> q100;
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private final List<PoolChunkListMetric> chunkListMetrics;
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// Metrics for allocations and deallocations
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private long allocationsNormal;
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// We need to use the LongCounter here as this is not guarded via synchronized block.
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private final LongCounter allocationsSmall = PlatformDependent.newLongCounter();
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private final LongCounter allocationsHuge = PlatformDependent.newLongCounter();
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private final LongCounter activeBytesHuge = PlatformDependent.newLongCounter();
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private long deallocationsSmall;
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private long deallocationsNormal;
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// We need to use the LongCounter here as this is not guarded via synchronized block.
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private final LongCounter deallocationsHuge = PlatformDependent.newLongCounter();
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// Number of thread caches backed by this arena.
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final AtomicInteger numThreadCaches = new AtomicInteger();
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// TODO: Test if adding padding helps under contention
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//private long pad0, pad1, pad2, pad3, pad4, pad5, pad6, pad7;
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protected PoolArena(PooledByteBufAllocator parent, int pageSize,
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int pageShifts, int chunkSize, int cacheAlignment) {
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super(pageSize, pageShifts, chunkSize, cacheAlignment);
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this.parent = parent;
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directMemoryCacheAlignment = cacheAlignment;
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directMemoryCacheAlignmentMask = cacheAlignment - 1;
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numSmallSubpagePools = nSubpages;
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smallSubpagePools = newSubpagePoolArray(numSmallSubpagePools);
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for (int i = 0; i < smallSubpagePools.length; i ++) {
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smallSubpagePools[i] = newSubpagePoolHead();
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}
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q100 = new PoolChunkList<T>(this, null, 100, Integer.MAX_VALUE, chunkSize);
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q075 = new PoolChunkList<T>(this, q100, 75, 100, chunkSize);
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q050 = new PoolChunkList<T>(this, q075, 50, 100, chunkSize);
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q025 = new PoolChunkList<T>(this, q050, 25, 75, chunkSize);
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q000 = new PoolChunkList<T>(this, q025, 1, 50, chunkSize);
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qInit = new PoolChunkList<T>(this, q000, Integer.MIN_VALUE, 25, chunkSize);
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q100.prevList(q075);
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q075.prevList(q050);
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q050.prevList(q025);
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q025.prevList(q000);
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q000.prevList(null);
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qInit.prevList(qInit);
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List<PoolChunkListMetric> metrics = new ArrayList<PoolChunkListMetric>(6);
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metrics.add(qInit);
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metrics.add(q000);
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metrics.add(q025);
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metrics.add(q050);
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metrics.add(q075);
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metrics.add(q100);
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chunkListMetrics = Collections.unmodifiableList(metrics);
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}
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private PoolSubpage<T> newSubpagePoolHead() {
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PoolSubpage<T> head = new PoolSubpage<T>();
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head.prev = head;
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head.next = head;
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return head;
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}
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@SuppressWarnings("unchecked")
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private PoolSubpage<T>[] newSubpagePoolArray(int size) {
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return new PoolSubpage[size];
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}
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abstract boolean isDirect();
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PooledByteBuf<T> allocate(PoolThreadCache cache, int reqCapacity, int maxCapacity) {
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PooledByteBuf<T> buf = newByteBuf(maxCapacity);
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allocate(cache, buf, reqCapacity);
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return buf;
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}
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private void allocate(PoolThreadCache cache, PooledByteBuf<T> buf, final int reqCapacity) {
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final int sizeIdx = size2SizeIdx(reqCapacity);
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if (sizeIdx <= smallMaxSizeIdx) {
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tcacheAllocateSmall(cache, buf, reqCapacity, sizeIdx);
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} else if (sizeIdx < nSizes) {
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tcacheAllocateNormal(cache, buf, reqCapacity, sizeIdx);
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} else {
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int normCapacity = directMemoryCacheAlignment > 0
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? normalizeSize(reqCapacity) : reqCapacity;
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// Huge allocations are never served via the cache so just call allocateHuge
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allocateHuge(buf, normCapacity);
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}
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}
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private void tcacheAllocateSmall(PoolThreadCache cache, PooledByteBuf<T> buf, final int reqCapacity,
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final int sizeIdx) {
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if (cache.allocateSmall(this, buf, reqCapacity, sizeIdx)) {
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// was able to allocate out of the cache so move on
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return;
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}
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/**
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* Synchronize on the head. This is needed as {@link PoolChunk#allocateSubpage(int)} and
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* {@link PoolChunk#free(long)} may modify the doubly linked list as well.
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*/
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final PoolSubpage<T> head = smallSubpagePools[sizeIdx];
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final boolean needsNormalAllocation;
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synchronized (head) {
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final PoolSubpage<T> s = head.next;
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needsNormalAllocation = s == head;
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if (!needsNormalAllocation) {
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assert s.doNotDestroy && s.elemSize == sizeIdx2size(sizeIdx);
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long handle = s.allocate();
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assert handle >= 0;
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s.chunk.initBufWithSubpage(buf, null, handle, reqCapacity, cache);
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}
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}
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if (needsNormalAllocation) {
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synchronized (this) {
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allocateNormal(buf, reqCapacity, sizeIdx, cache);
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}
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}
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incSmallAllocation();
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}
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private void tcacheAllocateNormal(PoolThreadCache cache, PooledByteBuf<T> buf, final int reqCapacity,
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final int sizeIdx) {
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if (cache.allocateNormal(this, buf, reqCapacity, sizeIdx)) {
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// was able to allocate out of the cache so move on
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return;
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}
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synchronized (this) {
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allocateNormal(buf, reqCapacity, sizeIdx, cache);
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++allocationsNormal;
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}
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}
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// Method must be called inside synchronized(this) { ... }Â block
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private void allocateNormal(PooledByteBuf<T> buf, int reqCapacity, int sizeIdx, PoolThreadCache threadCache) {
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if (q050.allocate(buf, reqCapacity, sizeIdx, threadCache) ||
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q025.allocate(buf, reqCapacity, sizeIdx, threadCache) ||
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q000.allocate(buf, reqCapacity, sizeIdx, threadCache) ||
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qInit.allocate(buf, reqCapacity, sizeIdx, threadCache) ||
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q075.allocate(buf, reqCapacity, sizeIdx, threadCache)) {
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return;
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}
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// Add a new chunk.
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PoolChunk<T> c = newChunk(pageSize, nPSizes, pageShifts, chunkSize);
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boolean success = c.allocate(buf, reqCapacity, sizeIdx, threadCache);
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assert success;
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qInit.add(c);
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}
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private void incSmallAllocation() {
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allocationsSmall.increment();
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}
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private void allocateHuge(PooledByteBuf<T> buf, int reqCapacity) {
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PoolChunk<T> chunk = newUnpooledChunk(reqCapacity);
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activeBytesHuge.add(chunk.chunkSize());
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buf.initUnpooled(chunk, reqCapacity);
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allocationsHuge.increment();
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}
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void free(PoolChunk<T> chunk, ByteBuffer nioBuffer, long handle, int normCapacity, PoolThreadCache cache) {
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if (chunk.unpooled) {
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int size = chunk.chunkSize();
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destroyChunk(chunk);
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activeBytesHuge.add(-size);
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deallocationsHuge.increment();
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} else {
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SizeClass sizeClass = sizeClass(handle);
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if (cache != null && cache.add(this, chunk, nioBuffer, handle, normCapacity, sizeClass)) {
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// cached so not free it.
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return;
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}
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freeChunk(chunk, handle, normCapacity, sizeClass, nioBuffer, false);
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}
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}
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private SizeClass sizeClass(long handle) {
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return isSubpage(handle) ? SizeClass.Small : SizeClass.Normal;
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}
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void freeChunk(PoolChunk<T> chunk, long handle, int normCapacity, SizeClass sizeClass, ByteBuffer nioBuffer,
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boolean finalizer) {
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final boolean destroyChunk;
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synchronized (this) {
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// We only call this if freeChunk is not called because of the PoolThreadCache finalizer as otherwise this
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// may fail due lazy class-loading in for example tomcat.
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if (!finalizer) {
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switch (sizeClass) {
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case Normal:
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++deallocationsNormal;
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break;
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case Small:
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++deallocationsSmall;
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break;
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default:
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throw new Error();
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}
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}
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destroyChunk = !chunk.parent.free(chunk, handle, normCapacity, nioBuffer);
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}
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if (destroyChunk) {
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// destroyChunk not need to be called while holding the synchronized lock.
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destroyChunk(chunk);
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}
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}
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PoolSubpage<T> findSubpagePoolHead(int sizeIdx) {
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return smallSubpagePools[sizeIdx];
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}
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void reallocate(PooledByteBuf<T> buf, int newCapacity, boolean freeOldMemory) {
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assert newCapacity >= 0 && newCapacity <= buf.maxCapacity();
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int oldCapacity = buf.length;
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if (oldCapacity == newCapacity) {
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return;
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}
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PoolChunk<T> oldChunk = buf.chunk;
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ByteBuffer oldNioBuffer = buf.tmpNioBuf;
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long oldHandle = buf.handle;
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T oldMemory = buf.memory;
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int oldOffset = buf.offset;
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int oldMaxLength = buf.maxLength;
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// This does not touch buf's reader/writer indices
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allocate(parent.threadCache(), buf, newCapacity);
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int bytesToCopy;
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if (newCapacity > oldCapacity) {
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bytesToCopy = oldCapacity;
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} else {
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buf.trimIndicesToCapacity(newCapacity);
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bytesToCopy = newCapacity;
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}
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memoryCopy(oldMemory, oldOffset, buf, bytesToCopy);
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if (freeOldMemory) {
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free(oldChunk, oldNioBuffer, oldHandle, oldMaxLength, buf.cache);
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}
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}
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@Override
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public int numThreadCaches() {
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return numThreadCaches.get();
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}
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@Override
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public int numTinySubpages() {
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return 0;
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}
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@Override
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public int numSmallSubpages() {
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return smallSubpagePools.length;
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}
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@Override
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public int numChunkLists() {
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return chunkListMetrics.size();
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}
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@Override
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public List<PoolSubpageMetric> tinySubpages() {
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return Collections.emptyList();
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}
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@Override
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public List<PoolSubpageMetric> smallSubpages() {
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return subPageMetricList(smallSubpagePools);
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}
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@Override
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public List<PoolChunkListMetric> chunkLists() {
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return chunkListMetrics;
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}
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private static List<PoolSubpageMetric> subPageMetricList(PoolSubpage<?>[] pages) {
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List<PoolSubpageMetric> metrics = new ArrayList<PoolSubpageMetric>();
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for (PoolSubpage<?> head : pages) {
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if (head.next == head) {
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continue;
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}
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PoolSubpage<?> s = head.next;
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for (;;) {
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metrics.add(s);
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s = s.next;
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if (s == head) {
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break;
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}
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}
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}
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return metrics;
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}
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@Override
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public long numAllocations() {
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final long allocsNormal;
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synchronized (this) {
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allocsNormal = allocationsNormal;
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}
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return allocationsSmall.value() + allocsNormal + allocationsHuge.value();
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}
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@Override
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public long numTinyAllocations() {
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return 0;
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}
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@Override
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public long numSmallAllocations() {
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return allocationsSmall.value();
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}
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@Override
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public synchronized long numNormalAllocations() {
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return allocationsNormal;
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}
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@Override
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public long numDeallocations() {
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final long deallocs;
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synchronized (this) {
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deallocs = deallocationsSmall + deallocationsNormal;
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}
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return deallocs + deallocationsHuge.value();
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}
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@Override
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public long numTinyDeallocations() {
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return 0;
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}
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@Override
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public synchronized long numSmallDeallocations() {
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return deallocationsSmall;
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}
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@Override
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public synchronized long numNormalDeallocations() {
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return deallocationsNormal;
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}
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@Override
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public long numHugeAllocations() {
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return allocationsHuge.value();
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}
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@Override
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public long numHugeDeallocations() {
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return deallocationsHuge.value();
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}
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@Override
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public long numActiveAllocations() {
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long val = allocationsSmall.value() + allocationsHuge.value()
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- deallocationsHuge.value();
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synchronized (this) {
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val += allocationsNormal - (deallocationsSmall + deallocationsNormal);
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}
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return max(val, 0);
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}
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@Override
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public long numActiveTinyAllocations() {
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return 0;
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}
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@Override
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public long numActiveSmallAllocations() {
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return max(numSmallAllocations() - numSmallDeallocations(), 0);
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}
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@Override
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public long numActiveNormalAllocations() {
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final long val;
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synchronized (this) {
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val = allocationsNormal - deallocationsNormal;
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}
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return max(val, 0);
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}
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@Override
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public long numActiveHugeAllocations() {
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return max(numHugeAllocations() - numHugeDeallocations(), 0);
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}
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@Override
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public long numActiveBytes() {
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long val = activeBytesHuge.value();
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synchronized (this) {
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for (int i = 0; i < chunkListMetrics.size(); i++) {
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for (PoolChunkMetric m: chunkListMetrics.get(i)) {
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val += m.chunkSize();
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}
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}
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}
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return max(0, val);
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}
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protected abstract PoolChunk<T> newChunk(int pageSize, int maxPageIdx, int pageShifts, int chunkSize);
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protected abstract PoolChunk<T> newUnpooledChunk(int capacity);
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protected abstract PooledByteBuf<T> newByteBuf(int maxCapacity);
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protected abstract void memoryCopy(T src, int srcOffset, PooledByteBuf<T> dst, int length);
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protected abstract void destroyChunk(PoolChunk<T> chunk);
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@Override
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public synchronized String toString() {
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StringBuilder buf = new StringBuilder()
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.append("Chunk(s) at 0~25%:")
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.append(StringUtil.NEWLINE)
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.append(qInit)
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.append(StringUtil.NEWLINE)
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.append("Chunk(s) at 0~50%:")
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.append(StringUtil.NEWLINE)
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.append(q000)
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.append(StringUtil.NEWLINE)
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.append("Chunk(s) at 25~75%:")
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.append(StringUtil.NEWLINE)
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.append(q025)
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.append(StringUtil.NEWLINE)
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.append("Chunk(s) at 50~100%:")
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.append(StringUtil.NEWLINE)
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.append(q050)
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.append(StringUtil.NEWLINE)
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.append("Chunk(s) at 75~100%:")
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.append(StringUtil.NEWLINE)
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.append(q075)
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.append(StringUtil.NEWLINE)
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.append("Chunk(s) at 100%:")
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.append(StringUtil.NEWLINE)
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.append(q100)
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.append(StringUtil.NEWLINE)
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.append("small subpages:");
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appendPoolSubPages(buf, smallSubpagePools);
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buf.append(StringUtil.NEWLINE);
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return buf.toString();
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}
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private static void appendPoolSubPages(StringBuilder buf, PoolSubpage<?>[] subpages) {
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for (int i = 0; i < subpages.length; i ++) {
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PoolSubpage<?> head = subpages[i];
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if (head.next == head) {
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continue;
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}
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buf.append(StringUtil.NEWLINE)
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.append(i)
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.append(": ");
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PoolSubpage<?> s = head.next;
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for (;;) {
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buf.append(s);
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s = s.next;
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if (s == head) {
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break;
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}
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}
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}
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}
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@Override
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protected final void finalize() throws Throwable {
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try {
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super.finalize();
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} finally {
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destroyPoolSubPages(smallSubpagePools);
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destroyPoolChunkLists(qInit, q000, q025, q050, q075, q100);
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}
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}
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private static void destroyPoolSubPages(PoolSubpage<?>[] pages) {
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for (PoolSubpage<?> page : pages) {
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page.destroy();
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}
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}
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private void destroyPoolChunkLists(PoolChunkList<T>... chunkLists) {
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for (PoolChunkList<T> chunkList: chunkLists) {
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chunkList.destroy(this);
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}
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}
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static final class HeapArena extends PoolArena<byte[]> {
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||
HeapArena(PooledByteBufAllocator parent, int pageSize, int pageShifts,
|
||
int chunkSize, int directMemoryCacheAlignment) {
|
||
super(parent, pageSize, pageShifts, chunkSize,
|
||
directMemoryCacheAlignment);
|
||
}
|
||
|
||
private static byte[] newByteArray(int size) {
|
||
return PlatformDependent.allocateUninitializedArray(size);
|
||
}
|
||
|
||
@Override
|
||
boolean isDirect() {
|
||
return false;
|
||
}
|
||
|
||
@Override
|
||
protected PoolChunk<byte[]> newChunk(int pageSize, int maxPageIdx, int pageShifts, int chunkSize) {
|
||
return new PoolChunk<byte[]>(this, newByteArray(chunkSize), pageSize, pageShifts, chunkSize, maxPageIdx, 0);
|
||
}
|
||
|
||
@Override
|
||
protected PoolChunk<byte[]> newUnpooledChunk(int capacity) {
|
||
return new PoolChunk<byte[]>(this, newByteArray(capacity), capacity, 0);
|
||
}
|
||
|
||
@Override
|
||
protected void destroyChunk(PoolChunk<byte[]> chunk) {
|
||
// Rely on GC.
|
||
}
|
||
|
||
@Override
|
||
protected PooledByteBuf<byte[]> newByteBuf(int maxCapacity) {
|
||
return HAS_UNSAFE ? PooledUnsafeHeapByteBuf.newUnsafeInstance(maxCapacity)
|
||
: PooledHeapByteBuf.newInstance(maxCapacity);
|
||
}
|
||
|
||
@Override
|
||
protected void memoryCopy(byte[] src, int srcOffset, PooledByteBuf<byte[]> dst, int length) {
|
||
if (length == 0) {
|
||
return;
|
||
}
|
||
|
||
System.arraycopy(src, srcOffset, dst.memory, dst.offset, length);
|
||
}
|
||
}
|
||
|
||
static final class DirectArena extends PoolArena<ByteBuffer> {
|
||
|
||
DirectArena(PooledByteBufAllocator parent, int pageSize, int pageShifts,
|
||
int chunkSize, int directMemoryCacheAlignment) {
|
||
super(parent, pageSize, pageShifts, chunkSize,
|
||
directMemoryCacheAlignment);
|
||
}
|
||
|
||
@Override
|
||
boolean isDirect() {
|
||
return true;
|
||
}
|
||
|
||
// mark as package-private, only for unit test
|
||
int offsetCacheLine(ByteBuffer memory) {
|
||
// We can only calculate the offset if Unsafe is present as otherwise directBufferAddress(...) will
|
||
// throw an NPE.
|
||
int remainder = HAS_UNSAFE
|
||
? (int) (PlatformDependent.directBufferAddress(memory) & directMemoryCacheAlignmentMask)
|
||
: 0;
|
||
|
||
// offset = alignment - address & (alignment - 1)
|
||
return directMemoryCacheAlignment - remainder;
|
||
}
|
||
|
||
@Override
|
||
protected PoolChunk<ByteBuffer> newChunk(int pageSize, int maxPageIdx,
|
||
int pageShifts, int chunkSize) {
|
||
if (directMemoryCacheAlignment == 0) {
|
||
return new PoolChunk<ByteBuffer>(this,
|
||
allocateDirect(chunkSize), pageSize, pageShifts,
|
||
chunkSize, maxPageIdx, 0);
|
||
}
|
||
final ByteBuffer memory = allocateDirect(chunkSize
|
||
+ directMemoryCacheAlignment);
|
||
return new PoolChunk<ByteBuffer>(this, memory, pageSize,
|
||
pageShifts, chunkSize, maxPageIdx,
|
||
offsetCacheLine(memory));
|
||
}
|
||
|
||
@Override
|
||
protected PoolChunk<ByteBuffer> newUnpooledChunk(int capacity) {
|
||
if (directMemoryCacheAlignment == 0) {
|
||
return new PoolChunk<ByteBuffer>(this,
|
||
allocateDirect(capacity), capacity, 0);
|
||
}
|
||
final ByteBuffer memory = allocateDirect(capacity
|
||
+ directMemoryCacheAlignment);
|
||
return new PoolChunk<ByteBuffer>(this, memory, capacity,
|
||
offsetCacheLine(memory));
|
||
}
|
||
|
||
private static ByteBuffer allocateDirect(int capacity) {
|
||
return PlatformDependent.useDirectBufferNoCleaner() ?
|
||
PlatformDependent.allocateDirectNoCleaner(capacity) : ByteBuffer.allocateDirect(capacity);
|
||
}
|
||
|
||
@Override
|
||
protected void destroyChunk(PoolChunk<ByteBuffer> chunk) {
|
||
if (PlatformDependent.useDirectBufferNoCleaner()) {
|
||
PlatformDependent.freeDirectNoCleaner(chunk.memory);
|
||
} else {
|
||
PlatformDependent.freeDirectBuffer(chunk.memory);
|
||
}
|
||
}
|
||
|
||
@Override
|
||
protected PooledByteBuf<ByteBuffer> newByteBuf(int maxCapacity) {
|
||
if (HAS_UNSAFE) {
|
||
return PooledUnsafeDirectByteBuf.newInstance(maxCapacity);
|
||
} else {
|
||
return PooledDirectByteBuf.newInstance(maxCapacity);
|
||
}
|
||
}
|
||
|
||
@Override
|
||
protected void memoryCopy(ByteBuffer src, int srcOffset, PooledByteBuf<ByteBuffer> dstBuf, int length) {
|
||
if (length == 0) {
|
||
return;
|
||
}
|
||
|
||
if (HAS_UNSAFE) {
|
||
PlatformDependent.copyMemory(
|
||
PlatformDependent.directBufferAddress(src) + srcOffset,
|
||
PlatformDependent.directBufferAddress(dstBuf.memory) + dstBuf.offset, length);
|
||
} else {
|
||
// We must duplicate the NIO buffers because they may be accessed by other Netty buffers.
|
||
src = src.duplicate();
|
||
ByteBuffer dst = dstBuf.internalNioBuffer();
|
||
src.position(srcOffset).limit(srcOffset + length);
|
||
dst.position(dstBuf.offset);
|
||
dst.put(src);
|
||
}
|
||
}
|
||
}
|
||
}
|