Utilities.cs

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using System.Numerics;
using System.Runtime.CompilerServices;
 
namespace System.Buffers;
 
internal static class Utilities
{
    internal enum MemoryPressure
    {
        Low,
        Medium,
        High
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static int SelectBucketIndex(int bufferSize)
    {
        return BitOperations.Log2((uint)(bufferSize - 1) | 0xFu) - 3;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static int GetMaxSizeForBucket(int binIndex)
    {
        return 16 << binIndex;
    }
 
    internal static MemoryPressure GetMemoryPressure()
    {
        GCMemoryInfo gCMemoryInfo = GC.GetGCMemoryInfo();
        if ((double)gCMemoryInfo.MemoryLoadBytes >= (double)gCMemoryInfo.HighMemoryLoadThresholdBytes * 0.9)
        {
            return MemoryPressure.High;
        }
        if ((double)gCMemoryInfo.MemoryLoadBytes >= (double)gCMemoryInfo.HighMemoryLoadThresholdBytes * 0.7)
        {
            return MemoryPressure.Medium;
        }
        return MemoryPressure.Low;
    }
}