149 lines
6.2 KiB
C#
149 lines
6.2 KiB
C#
//-----------------------------------------------------------------------
|
|
// -----------------------------------------------------------------------
|
|
// file="L4.Prefetch"
|
|
// Project: StgSharp
|
|
// AuthorGroup: Nitload
|
|
// Copyright (c) Nitload. All rights reserved.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
//
|
|
// -----------------------------------------------------------------------
|
|
// -----------------------------------------------------------------------
|
|
using System.ComponentModel;
|
|
using System.Numerics;
|
|
|
|
namespace StgSharp.HighPerformance.Memory
|
|
{
|
|
public unsafe partial class L4
|
|
{
|
|
|
|
public const int MaxActivateCacheLineCount = 1024;
|
|
|
|
private partial void Prefetch()
|
|
{
|
|
if (CurrentPredict is null) {
|
|
return;
|
|
}
|
|
if (_activeCount > MaxActivateCacheLineCount) {
|
|
throw new OverflowException("Too many activated cache line in external reference.");
|
|
}
|
|
IL4Predict predict = CurrentPredict;
|
|
int predictIndex = CurrentPredictIndex;
|
|
Span<CacheLineDescription> span = new(_prediction, PredictionCount);
|
|
PredictResult result = predict.Predict(span, out int actualCount);
|
|
if ((result & PredictResult.Exhausted) != 0) {
|
|
_exhausted = !TryGetNextPredict();
|
|
}
|
|
if (actualCount <= 0)
|
|
{
|
|
_exhausted = true;
|
|
return;
|
|
}
|
|
int missIndex = 0;
|
|
for (int i = 0; i < actualCount; i++)
|
|
{
|
|
ref CacheLineDescription handle = ref span[i];
|
|
nuint address = handle.Address;
|
|
if (!_map.TryGet(address, out _))
|
|
{
|
|
// miss and record
|
|
span[missIndex] = handle;
|
|
missIndex++;
|
|
}
|
|
}
|
|
_predictors.RequestSpanOperation();
|
|
Span<IL4Predict> predictorSpan = _predictors.AsSpan();
|
|
try
|
|
{
|
|
// now prefetch the misses
|
|
for (int i = 0; i < missIndex; i++)
|
|
{
|
|
CacheLineMetadata* head;
|
|
ref CacheLineDescription pHandle = ref span[i];
|
|
nuint address = pHandle.Address;
|
|
int index;
|
|
if (_map.TryGet(address, out nuint handle))
|
|
{
|
|
head = (CacheLineMetadata*)handle;
|
|
index = head->Id;
|
|
(*_predictCount)[index] = 0; // reset eviction counter
|
|
|
|
#region update predictor belonging
|
|
|
|
int predictId = head->Predictor;
|
|
IL4Predict belong = predictorSpan[predictId];
|
|
|
|
if (!ReferenceEquals(predict, belong))
|
|
{
|
|
throw new L4PredictConflictException(head->Origin, head->Profile, predictId);
|
|
} else
|
|
{
|
|
if ((*_predictCount)[index] > short.MaxValue / 2)
|
|
{
|
|
int predictCount = Volatile.Read(ref (*_predictCount)[index]);
|
|
int mapCount = Volatile.Read(ref (*_mapCount)[index]);
|
|
int decrement = (int.Min(predictCount, mapCount) + 1) / 2;
|
|
_ = Interlocked.Add(ref (*_predictCount)[index], -decrement);
|
|
_ = Interlocked.Add(ref (*_mapCount)[index], -decrement);
|
|
}
|
|
(*_predictCount)[index]++;
|
|
}
|
|
|
|
#endregion
|
|
|
|
continue;
|
|
}
|
|
|
|
int retryCount = 0, remain = missIndex - i;
|
|
const int maxRetry = 1024;
|
|
while (!_bufferAllocator.TryAlloc(pHandle.Size, out index))
|
|
{
|
|
remain = Evict(remain);
|
|
retryCount++;
|
|
if (retryCount > maxRetry) {
|
|
throw new OverflowException($"Failed to evict cache line after {maxRetry} retries.");
|
|
}
|
|
if (retryCount > maxRetry / 2) {
|
|
Thread.Sleep(1);
|
|
}
|
|
}
|
|
head = _head + index;
|
|
head->Origin = address;
|
|
head->Profile = pHandle.MapPolicy;
|
|
head->RefCount = 0;
|
|
head->Predictor = (short)predictIndex;
|
|
|
|
(*_predictCount)[index] = 1;
|
|
(*_mapCount)[index] = 1;
|
|
|
|
// pre fetch them here
|
|
predict.Prefetch(head->Origin, head->Profile, new Span<byte>((byte*)(ulong)head->Position, (int)(ulong)head->SizeForAllocator));
|
|
_ = _map.TryAddOrSet(address, (nuint)head, out _);
|
|
}
|
|
_ = Interlocked.Add(ref _aheadCount, actualCount);
|
|
}
|
|
finally
|
|
{
|
|
_predictors.ReleaseSpanOperation();
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|