260 lines
9.2 KiB
C#
260 lines
9.2 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="HLSFAllocator.Alloc.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using Microsoft.Win32;
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using StgSharp.Threading;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using hlsfHandle = StgSharp.HighPerformance.Memory.HybridLayerSegregatedFitAllocationHandle;
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namespace StgSharp.HighPerformance.Memory
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{
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public unsafe partial class HybridLayerSegregatedFitAllocator
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{
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private BufferExpansionLock _spareLock = new();
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public hlsfHandle Alloc(uint size)
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{
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ArgumentOutOfRangeException.ThrowIfGreaterThan<nuint>(size, (nuint)levelSizeArray[^1] * 2);
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int level = GetLevelFromSize(size);
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int segmentIndex = DetermineSegmentIndex(size, level);
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int i = level, s = segmentIndex;
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if (TryPopLevelForAllocation(i, s, out Entry* handle)) {
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return new hlsfHandle(handle, size);
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}
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i = level;
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s = segmentIndex;
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while (!TryPopLevelForAllocation(i, s, out handle))
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{
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if (++s >= 3)
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{
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s = 0;
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i++;
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}
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if (i >= levelSizeArray.Length)
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{
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if (!TryAllocateNew16MBBlock(out handle)) {
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throw new OverflowException("Out of memory: Unable to allocate new 16MB block or find suitable bucket for allocation.");
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}
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break;
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}
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}
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if (handle != null) {
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SliceMemory(handle, (segmentIndex + 1) * levelSizeArray[level]);
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}
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return new hlsfHandle(handle, size);
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}
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private void SliceMemory(Entry* e, int offset)
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{
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Entry* current = e;
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ulong n = e->NextNear;
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Entry* next = (Entry*)n;
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ulong originOffset = e->Position - (ulong)m_Buffer;
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ulong finalOffset = originOffset + (ulong)offset;
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ulong end = e->Position + e->Size - (ulong)m_Buffer;
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int remainSize = (int)(e->Size - offset);
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if ((originOffset & 63) != 0) {
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throw new InvalidOperationException("Entry position offset is not aligned to 64 bytes.");
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}
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int minLevel = Math.Max((BitOperations.TrailingZeroCount(finalOffset) - 6) / 2, 0);
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int i = minLevel >= levelSizeArray.Length ? levelSizeArray.Length - 1 : minLevel;
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for (; i < levelSizeArray.Length; i++)
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{
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int levelSize = levelSizeArray[i];
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ulong board = (finalOffset + (ulong)levelSize - 1) & ~((ulong)levelSize - 1);
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int blockCount = (int)((ulong.Min(board, end) - board) / (ulong)levelSize);
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if (blockCount == 0)
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{
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break;
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}
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int s = blockCount * levelSize;
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// create and init new entry
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Entry* newEntry = (Entry*)_entries.Allocate();
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newEntry->Position = (nuint)((ulong)m_Buffer + finalOffset);
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newEntry->Size = (uint)s;
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BucketNode* bucket = (BucketNode*)newEntry->Position;
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bucket->EntryRef = newEntry;
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// link new entry
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newEntry->PreviousNear = (ulong)current;
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newEntry->NextNear = n;
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current->NextNear = (ulong)newEntry;
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if (next != null) {
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next->PreviousNear = (ulong)newEntry;
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}
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newEntry->Level = i;
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PushLevel(i, blockCount - 1, bucket);
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// set new entry
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current = newEntry;
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// update data
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finalOffset += (ulong)s;
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remainSize -= s;
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}
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if (remainSize <= 0) {
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return;
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}
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for (i -= 1; i >= 0; i--)
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{
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int levelSize = levelSizeArray[i];
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ulong board = (finalOffset + (ulong)levelSize - 1) & ~((ulong)levelSize - 1);
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int blockCount = (int)((ulong.Min(board, end) - finalOffset) / (ulong)levelSize);
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if (blockCount == 0)
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{
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continue;
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}
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int s = blockCount * levelSize;
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// create and init new entry
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Entry* newEntry = (Entry*)_entries.Allocate();
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newEntry->Position = (nuint)((ulong)m_Buffer + finalOffset);
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newEntry->Size = (uint)s;
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BucketNode* bucket = (BucketNode*)newEntry->Position;
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bucket->EntryRef = newEntry;
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// link new entry
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newEntry->PreviousNear = (ulong)current;
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newEntry->NextNear = n;
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current->NextNear = (ulong)newEntry;
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if (next != null) {
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next->PreviousNear = (ulong)newEntry;
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}
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newEntry->Level = i;
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PushLevel(i, blockCount - 1, bucket);
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// set new entry
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current = newEntry;
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// update data
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finalOffset += (ulong)s;
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remainSize -= s;
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if (remainSize <= 0)
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{
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break;
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}
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}
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}
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/// <summary>
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/// Try to allocate a new 16MB block when all buckets are empty
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/// </summary>
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/// <param name="handle">
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/// Output handle to the allocated Entry
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/// </param>
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/// <returns>
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/// True if allocation succeeded
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/// </returns>
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private bool TryAllocateNew16MBBlock(out Entry* handle)
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{
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nuint pos = _spareMemory->Position;
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nuint blockSize = (nuint)levelSizeArray[^1] * 2; // Use last level size (16MB)
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nuint newPos = pos + blockSize;
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ulong p = _spareMemory->PreviousNear;
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Entry* previous = (Entry*)p;
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if (_spareMemory->Size <= 0)
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{
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handle = null;
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return false; // No spare memory available
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}
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// Check if we have enough space
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if (newPos > ((nuint)m_Buffer) + _size)
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{
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newPos = (nuint)m_Buffer + _size; // Clamp to maximum buffer size
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blockSize = _spareMemory->Size;
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}
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// Try to allocate new Entry from slab allocator
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handle = (Entry*)_entries.Allocate();
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handle->Position = pos;
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handle->Size = (uint)blockSize;
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handle->Level = GetLevelFromSize((uint)blockSize);
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// Update spare memory position
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_spareMemory->Position = newPos;
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BucketNode* b = (BucketNode*)handle->Position;
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b->EntryRef = handle;
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PushLevel(handle->Level, DetermineSegmentIndex((uint)blockSize, handle->Level), b);
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// update position linked list
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handle->NextNear = (ulong)_spareMemory;
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handle->PreviousNear = p;
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_spareMemory->PreviousNear = (ulong)handle;
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if (previous != null) {
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previous->NextNear = (ulong)handle;
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}
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return true;
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}
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/// <summary>
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/// Helper method for allocation - converts BucketNode to Entry
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/// </summary>
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private bool TryPopLevelForAllocation(int levelIndex, int sizeIndex, out Entry* entry)
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{
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if (TryPopLevel(levelIndex, sizeIndex, out BucketNode* bucketNode))
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{
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entry = bucketNode->EntryRef;
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return entry != null;
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}
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entry = null;
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return false;
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}
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}
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}
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