235 lines
9.1 KiB
C#
235 lines
9.1 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="HLSFAllocator.Alloc"
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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 obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using System;
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using System.Numerics;
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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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public hlsfHandle Alloc(long size)
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{
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if (size > _maxSize) {
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throw new InvalidOperationException("Requested size exceeds maximum allocatable size.");
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}
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int level = GetLevelFromSize(size);
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int segmentIndex = DetermineSegmentIndex(_levelSizeArray, size, level);
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int i = level, s = segmentIndex;
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Entry* handle;
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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 > MaxLevel)
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{
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if (TryPopLevelForAllocation(10, 1, out handle))
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{
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break;
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} else if (TryAllocateNew32MBBlock(out handle))
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{
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break;
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}
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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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}
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if (handle != null)
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{
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int requestedOffset = (segmentIndex + 1) * _levelSizeArray[level];
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if (requestedOffset > handle->Size) {
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throw new OverflowException("Out of memory: insufficient block size returned from spare memory.");
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}
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long remainder = handle->Size - requestedOffset;
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SetEntryLevel(handle, handle->Position, (uint)requestedOffset);
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handle->State = EntryState.Alloc;
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if (remainder > 0) {
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SliceMemory(handle->NextNear, remainder);
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}
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}
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return new hlsfHandle(handle, size);
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}
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/// <summary>
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/// Slice the memory block into smaller blocks and add them to the appropriate buckets
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/// Notice: this method is not responsible for freeing the original BucketNode
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/// </summary>
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/// <param name="e">
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///
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/// </param>
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/// <param name="sizeToSlice">
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///
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/// </param>
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private void SliceMemory(Entry* e, long sizeToSlice)
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{
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Entry* next = e;
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long remain = sizeToSlice; // remained size to slice
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long offset = (long)e->Position - sizeToSlice - (long)m_Buffer; // offset of buffer to slice
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long end = (long)e->Position - (long)m_Buffer; // end offset of buffer to slice
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int i = (BitOperations.TrailingZeroCount(offset) - 6) / 2;
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i = int.Min(10, i);
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for (; i < _levelSizeArray.Length; i++)
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{
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int size = _levelSizeArray[i];
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int upper = size * 4;
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long edge = (offset + upper - 1) / upper * upper;
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int count = (int)((long.Min(edge, end) - offset) / size);
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if (count > 0)
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{
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long newSize = count * size;
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Entry* newEntry = (Entry*)_entries.Allocate();
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InsertEntryBefore(newEntry, next);
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SetEntryLevel(newEntry, (nuint)offset + (nuint)m_Buffer, newSize);
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newEntry->State = EntryState.Empty;
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BucketNode* b = (BucketNode*)newEntry->Position;
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b->EntryRef = newEntry;
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PushBucketToLevel(i, count - 1, b);
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offset += newSize;
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remain -= newSize;
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}
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if (remain <= 0) {
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return;
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}
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}
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if (i > MaxLevel)
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{
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int size = _levelSizeArray[^1];
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int upper = size * 4;
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long edge = end / upper * upper;
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int count = (int)((long.Min(edge, end) - offset) / upper);
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if (count > 0)
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{
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long newSize = (long)count * (long)upper;
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Entry* newEntry = (Entry*)_entries.Allocate();
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InsertEntryBefore(newEntry, next);
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SetEntryLevel(newEntry, (nuint)offset + (nuint)m_Buffer, newSize);
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newEntry->State = EntryState.Empty;
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BucketNode* b = (BucketNode*)newEntry->Position;
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b->EntryRef = newEntry;
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PushBucketToLevel(i, count - 1, b);
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offset += newSize;
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remain -= newSize;
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if (remain <= 0) {
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return;
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}
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}
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}
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for (i--; i >= 0; i--)
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{
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int size = _levelSizeArray[i];
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long edge = end / size * size;
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int count = (int)((long.Min(edge, end) - offset) / size);
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if (count > 0)
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{
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long newSize = count * size;
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Entry* newEntry = (Entry*)_entries.Allocate();
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InsertEntryBefore(newEntry, next);
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SetEntryLevel(newEntry, (nuint)offset + (nuint)m_Buffer, newSize);
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newEntry->State = EntryState.Empty;
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BucketNode* b = (BucketNode*)newEntry->Position;
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b->EntryRef = newEntry;
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b->NextLevel = null;
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b->PreviousLevel = null;
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PushBucketToLevel(i, count - 1, b);
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offset += newSize;
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remain -= newSize;
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}
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if (remain <= 0) {
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return;
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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 TryAllocateNew32MBBlock(out Entry* handle)
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{
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nuint pos = _spareMemory->Position;
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long remain = _spareMemory->Size;
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if (remain <= 0)
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{
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handle = null;
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return false;
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}
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long size = remain > 32 * 1024 * 1024L ? 32 * 1024 * 1024L : remain;
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// build new entry
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Entry* e = (Entry*)_entries.Allocate();
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SetEntryLevel(e, pos, size);
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InsertEntryBefore(e, _spareMemory);
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e->State = EntryState.Empty;
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// set fields of spare memory
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_spareMemory->Size -= size;
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_spareMemory->Position += (nuint)size;
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handle = e;
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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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