112 lines
4.1 KiB
C#
112 lines
4.1 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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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.Intrinsics;
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using System.Runtime.Intrinsics.X86;
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using System.Text;
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using System.Threading.Tasks;
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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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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private unsafe void AgeAll()
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{
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_intrinsic.AgeAll(_eviction);
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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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int remain = count;
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Vector128<byte> three = Vector128.Create((byte)0x03);
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byte* p = (byte*)_eviction;
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for (int i = 0; (i < CacheLineCount) && (remain > 0); i += 16)
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{
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int evictMask = _intrinsic.ScanEvict(p + i, three);
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while ((evictMask != 0) && (remain > 0))
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{
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int bitPos = BitOperations.TrailingZeroCount(evictMask);
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int index = bitPos + i;
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CacheLineHead* 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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int id = (int)head->_predictor;
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IL4Predict predict = _predictions[id] ??
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throw new L4PredictUnregisteredException(id);
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predict.WriteBack(head->_origin, head->_profile, new ReadOnlySpan<byte>((byte*)head->_address, Unsafe.SizeOf<CacheLineData>()));
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RecycleLine(index);
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remain--;
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}
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evictMask &= evictMask - 1;
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}
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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 void RecycleLine(
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int id
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)
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{
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_idMux.Push(id);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private bool TryGetEmptyLine(
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out int index
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)
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{
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if (_idMux.TryPop(out index)) {
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return true;
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}
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index = _maxId;
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return Interlocked.Increment(ref _maxId) <= CacheLineCount;
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}
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}
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}
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