85 lines
3.1 KiB
C#
85 lines
3.1 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="L4.Evict"
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// Project: StgSharp
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// AuthorGroup: Nitload
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// Copyright (c) Nitload. 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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namespace StgSharp.HighPerformance.Memory
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{
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public partial class L4
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{
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/// <summary>
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///
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/// </summary>
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/// <param name="count">
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///
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/// </param>
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/// <returns>
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/// Count of lines not evicted
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/// </returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private unsafe int Evict(
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int count = 1
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)
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{
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count = (count < 0) ? 0 : count;
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int* pPtr = _predictCount, mPtr = _mapCount;
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int remain = count;
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for (int i = 0; i < CacheLineCount; i++)
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{
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if (pPtr[i] > mPtr[i])
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{
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continue;
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}
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remain -= TryEvictAt(i) ? 1 : 0;
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}
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return remain;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private unsafe bool TryEvictAt(
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int index
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)
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{
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CacheLineMetadata* head = &_head[index];
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if (Interlocked.CompareExchange(ref head->RefCount, int.MinValue, 0) == 0)
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{
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// EvictLine(i + index);
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_ = _map.TryRemove(head->Origin, out _);
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IL4Predict predict = CurrentPredict;
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predict.WriteBack(head->Origin, head->CustomizeProfile, new ReadOnlySpan<byte>((byte*)(ulong)(head->PositionMask + _baseAddress), (int)(ulong)head->SizeMask));
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_bufferAllocator.Free(index);
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_mapCount[index] = 0;
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_predictCount[index] = int.MaxValue;
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return true;
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}
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return false;
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}
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}
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}
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