Abort hlsf, goes back to tlsf, may use 'Arena-ed tlsf'

2026-05-09 18:18:57 +08:00
parent d1aca8f745
commit 942933dcac
11 changed files with 653 additions and 21 deletions
@@ -0,0 +1,154 @@
+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="HLSFAllocator.Level"
+// 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;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Security;
+using System.Numerics;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.HighPerformance.Memory
+{
+    public unsafe partial class HybridLayerSegregatedFitAllocator
+    {
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private nuint GetAllocSize(
+                      nuint size
+        )
+
+        {
+            return (size + 63u) & (~63u);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private int GetBucketIndexOnce(
+                    nuint size
+        )
+        {
+            int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)size);
+
+            // Calculate level: level = max(0, (log2Size - 6) / 2)
+            int level = Math.Max(0, (log2Size - 6) / 2);
+
+            // caller is responsible for ensuring level is within bounds
+            level = Math.Min(level, _maxLevel);
+            uint levelSize = 1u << (log2Size & (~1));
+            int segment = ((int)(size / levelSize)) - 1;
+            return Math.Min((level * 3) + segment, _bucketHeads.Length - 1);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private (int level, int segment) GetIndexPairOnce(
+                                         nuint size
+        )
+        {
+            int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)size);
+
+            // Calculate level: level = max(0, (log2Size - 6) / 2)
+            int level = Math.Max(0, (log2Size - 6) / 2);
+
+            // caller is responsible for ensuring level is within bounds
+            level = Math.Min(level, _maxLevel);
+            uint levelSize = 1u << (log2Size & (~1));
+            int segment = ((int)(size / levelSize)) - 1;
+            return (level, segment);
+        }
+
+        /// <summary>
+        ///   NOTICE: returned level may exceed maxLevel, caller is responsible for ensuring the
+        ///   returned level is within bounds. This method is designed for performance and does not
+        ///   perform bounds checking.
+        /// </summary>
+        /// <param name="size">
+        ///   Size of the memory block to determine level for. This method does not assume size is
+        ///   already aligned
+        /// </param>
+        /// <returns>
+        ///   Level corresponding to the given size. Level is determined based on the formula: level
+        ///   >= (log2(S) - 6) / 2
+        /// </returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private int GetLevelFromSize(
+                    nuint size
+        )
+        {
+            /*
+            * Level sizes: [64, 256, 1024, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216, ......]
+            * Pattern: 64 * 4^level = 2^6 * 2^(2*level) = 2^(6+2*level)
+            * 
+            * For size S, we need: 2^(6+2*level) >= S
+            * So: 6+2*level >= log2(S)
+            * Therefore: level >= (log2(S) - 6) / 2
+            * 
+            * We use hardware LZCNT instruction via BitOperations.LeadingZeroCount
+            * log2(S) = 63 - LeadingZeroCount(S) for 64-bit values
+            */
+            int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)size);
+
+            // Calculate level: level = max(0, (log2Size - 6) / 2)
+            int level = Math.Max(0, (log2Size - 6) / 2);
+
+            // caller is responsible for ensuring level is within bounds
+            return level;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static uint GetLevelSizeFromLevel(
+                            int level
+        )
+        {
+            return 1u << (6 + (2 * level));
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static uint GetLevelSizeFromSize(
+                            nuint size
+        )
+        {
+            int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)size);
+            return 1u << (log2Size & (~1));
+        }
+
+        /// <summary>
+        ///   Determine segment index based on size and originLevel. Input level value is regarded
+        ///   safe.
+        /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private int GetSegmentFromLevel(
+                    ulong size,
+                    int level
+        )
+        {
+            return ((int)(size / GetLevelSizeFromLevel(level))) - 1;
+        }
+
+    }
+}