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L4 removes RRPV array, will not support cross-predictor reuse, will use out-line predictcount and map count array, will not use inline predict count.

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Youmu Liu
2026-04-22 18:11:00 +08:00
parent 4f3e206dcb
commit 5252be9436
2 changed files with 16 additions and 5 deletions
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StgSharp.Common/HighPerformance/Memory/L4.Prefetch.cs
+4 -5
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@@ -93,16 +93,15 @@ namespace StgSharp.HighPerformance.Memory
// This branch performs resident-line adoption rather than a simple policy
// equality check. Returning true means the current predictor can keep using
// the existing cache bytes without a write-back plus re-prefetch cycle.
if (predict.IsSamePolicy(head->Profile, belong))
if (!ReferenceEquals(predict, belong))
{
head->Predictor = (short)predictIndex;
throw new L4PredictConflictException(head->Origin, head->Profile, predictId);
} else
{
// Compatibility failed, so the old owner must first flush its view of
// the line before the new predictor rematerializes the cache bytes.
belong.WriteBack(head->Origin, head->Profile, new ReadOnlySpan<byte>((byte*)head->Address, (int)head->Size));
head->Profile = pHandle.MapPolicy;
predict.Prefetch(head->Origin, head->Profile, new Span<byte>((byte*)head->Address, (int)head->Size));
_ = Interlocked.Increment(ref head->RemainingPredictionCount);
}
#endregion