472 lines
16 KiB
Java
472 lines
16 KiB
Java
/*
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* Copyright 2021 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.api.pool;
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import io.netty.buffer.api.AllocatorControl;
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import io.netty.buffer.api.Buffer;
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import io.netty.buffer.api.MemoryManager;
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import io.netty.util.internal.StringUtil;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.VarHandle;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.atomic.LongAdder;
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import static io.netty.buffer.api.pool.PoolChunk.isSubpage;
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import static java.lang.Math.max;
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class PoolArena extends SizeClasses implements PoolArenaMetric, AllocatorControl {
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private static final VarHandle SUBPAGE_ARRAY = MethodHandles.arrayElementVarHandle(PoolSubpage[].class);
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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 PooledBufferAllocator parent;
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final MemoryManager manager;
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final int numSmallSubpagePools;
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final int directMemoryCacheAlignment;
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private final PoolSubpage[] smallSubpagePools;
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private final PoolChunkList q050;
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private final PoolChunkList q025;
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private final PoolChunkList q000;
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private final PoolChunkList qInit;
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private final PoolChunkList q075;
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private final PoolChunkList 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 LongAdder here as this is not guarded via synchronized block.
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private final LongAdder allocationsSmall = new LongAdder();
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private final LongAdder allocationsHuge = new LongAdder();
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private final LongAdder activeBytesHuge = new LongAdder();
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private long deallocationsSmall;
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private long deallocationsNormal;
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// We need to use the LongAdder here as this is not guarded via synchronized block.
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private final LongAdder deallocationsHuge = new LongAdder();
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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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protected PoolArena(PooledBufferAllocator parent, MemoryManager manager, 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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this.manager = manager;
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directMemoryCacheAlignment = cacheAlignment;
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numSmallSubpagePools = nSubpages;
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smallSubpagePools = newSubpagePoolArray(numSmallSubpagePools);
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q100 = new PoolChunkList(this, null, 100, Integer.MAX_VALUE, chunkSize);
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q075 = new PoolChunkList(this, q100, 75, 100, chunkSize);
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q050 = new PoolChunkList(this, q075, 50, 100, chunkSize);
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q025 = new PoolChunkList(this, q050, 25, 75, chunkSize);
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q000 = new PoolChunkList(this, q025, 1, 50, chunkSize);
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qInit = new PoolChunkList(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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chunkListMetrics = List.of(qInit, q000, q025, q050, q075, q100);
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}
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private static PoolSubpage newSubpagePoolHead() {
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PoolSubpage head = new PoolSubpage();
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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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private static PoolSubpage[] newSubpagePoolArray(int size) {
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return new PoolSubpage[size];
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}
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UntetheredMemory allocate(PooledAllocatorControl control, PoolThreadCache cache, int size) {
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final int sizeIdx = size2SizeIdx(size);
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if (sizeIdx <= smallMaxSizeIdx) {
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return tcacheAllocateSmall(control, cache, size, sizeIdx);
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} else if (sizeIdx < nSizes) {
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return tcacheAllocateNormal(control, cache, size, sizeIdx);
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} else {
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int normCapacity = directMemoryCacheAlignment > 0
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? normalizeSize(size) : size;
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// Huge allocations are never served via the cache so just call allocateHuge
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return allocateHuge(normCapacity);
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}
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}
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private UntetheredMemory tcacheAllocateSmall(PooledAllocatorControl control, PoolThreadCache cache, final int size,
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final int sizeIdx) {
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UntetheredMemory memory = cache.allocateSmall(control, size, sizeIdx);
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if (memory != null) {
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// was able to allocate out of the cache so move on
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return memory;
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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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PoolSubpage head = findSubpagePoolHead(sizeIdx);
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final boolean needsNormalAllocation;
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synchronized (head) {
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final PoolSubpage 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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memory = s.chunk.allocateBufferWithSubpage(handle, size, cache, control);
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}
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}
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if (needsNormalAllocation) {
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synchronized (this) {
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memory = allocateNormal(size, sizeIdx, cache, control);
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}
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}
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incSmallAllocation();
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return memory;
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}
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private UntetheredMemory tcacheAllocateNormal(
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PooledAllocatorControl control, PoolThreadCache cache, int size, int sizeIdx) {
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UntetheredMemory memory = cache.allocateNormal(this, control, size, sizeIdx);
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if (memory != null) {
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// was able to allocate out of the cache so move on
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return memory;
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}
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synchronized (this) {
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memory = allocateNormal(size, sizeIdx, cache, control);
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allocationsNormal++;
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}
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return memory;
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}
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// Method must be called inside synchronized(this) { ... } block
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private UntetheredMemory allocateNormal(
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int size, int sizeIdx, PoolThreadCache threadCache, PooledAllocatorControl control) {
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UntetheredMemory memory = q050.allocate(size, sizeIdx, threadCache, control);
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if (memory != null) {
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return memory;
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}
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memory = q025.allocate(size, sizeIdx, threadCache, control);
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if (memory != null) {
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return memory;
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}
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memory = q000.allocate(size, sizeIdx, threadCache, control);
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if (memory != null) {
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return memory;
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}
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memory = qInit.allocate(size, sizeIdx, threadCache, control);
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if (memory != null) {
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return memory;
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}
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memory = q075.allocate(size, sizeIdx, threadCache, control);
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if (memory != null) {
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return memory;
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}
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// Add a new chunk.
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PoolChunk c = newChunk(pageSize, nPSizes, pageShifts, chunkSize);
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memory = c.allocate(size, sizeIdx, threadCache, control);
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assert memory != null;
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qInit.add(c);
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return memory;
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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 UntetheredMemory allocateHuge(int size) {
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activeBytesHuge.add(size);
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allocationsHuge.increment();
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return new UnpooledUnthetheredMemory(parent, manager, size);
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}
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void free(PoolChunk chunk, long handle, int normCapacity, PoolThreadCache cache) {
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SizeClass sizeClass = sizeClass(handle);
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if (cache != null && cache.add(this, chunk, 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);
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}
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private static 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 chunk, long handle, int normCapacity, SizeClass sizeClass) {
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final boolean destroyChunk;
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synchronized (this) {
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if (sizeClass == SizeClass.Normal) {
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++deallocationsNormal;
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} else if (sizeClass == SizeClass.Small) {
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++deallocationsSmall;
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} else {
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throw new AssertionError("Unexpected size class: " + sizeClass);
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}
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destroyChunk = !chunk.parent.free(chunk, handle, normCapacity);
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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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chunk.destroy();
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}
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}
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PoolSubpage findSubpagePoolHead(int sizeIdx) {
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PoolSubpage head = (PoolSubpage) SUBPAGE_ARRAY.getVolatile(smallSubpagePools, sizeIdx);
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if (head == null) {
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head = newSubpagePoolHead();
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if (!SUBPAGE_ARRAY.compareAndSet(smallSubpagePools, sizeIdx, null, head)) {
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// We lost the race. Read the winning value.
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head = (PoolSubpage) SUBPAGE_ARRAY.getVolatile(smallSubpagePools, sizeIdx);
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}
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}
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return head;
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}
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@Override
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public UntetheredMemory allocateUntethered(Buffer originator, int size) {
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throw new AssertionError("PoolChunk base buffers should never need to reallocate.");
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}
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@Override
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public void recoverMemory(Object memory) {
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// This means we've lost all strong references to a PoolChunk.
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// Probably means we don't need it anymore, so just free its memory.
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manager.discardRecoverableMemory(memory);
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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 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> 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<>();
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for (int i = 0, len = pages.length; i < len; i++) {
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PoolSubpage head = (PoolSubpage) SUBPAGE_ARRAY.getVolatile(pages, i);
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if (head == null || head.next == head) {
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continue;
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}
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PoolSubpage s = head.next;
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do {
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metrics.add(s);
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s = s.next;
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} while (s != head);
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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.longValue() + allocsNormal + allocationsHuge.longValue();
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}
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@Override
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public long numSmallAllocations() {
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return allocationsSmall.longValue();
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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.longValue();
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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.longValue();
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}
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@Override
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public long numHugeDeallocations() {
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return deallocationsHuge.longValue();
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}
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@Override
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public long numActiveAllocations() {
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long val = allocationsSmall.longValue() + allocationsHuge.longValue()
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- deallocationsHuge.longValue();
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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 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.longValue();
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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 final PoolChunk newChunk(int pageSize, int maxPageIdx, int pageShifts, int chunkSize) {
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return new PoolChunk(this, pageSize, pageShifts, chunkSize, maxPageIdx);
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}
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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 = (PoolSubpage) SUBPAGE_ARRAY.getVolatile(subpages, i);
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if (head == null || 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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do {
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buf.append(s);
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s = s.next;
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} while (s != head);
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}
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}
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public void close() {
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for (int i = 0, len = smallSubpagePools.length; i < len; i++) {
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PoolSubpage page = (PoolSubpage) SUBPAGE_ARRAY.getVolatile(smallSubpagePools, i);
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if (page != null) {
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page.destroy();
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}
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}
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for (PoolChunkList list : new PoolChunkList[] {qInit, q000, q025, q050, q100}) {
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list.destroy();
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}
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}
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}
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