From e850e7cc4277aa9514d21053cf04e44c34e03e17 Mon Sep 17 00:00:00 2001
From: "Moe Charm (CI)" <moecharm@example.com>
Date: Fri, 21 Nov 2025 23:49:59 +0900
Subject: [PATCH] Update CLAUDE.md: Document 2025-11-21 bug fixes and
 performance status
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## Updates

### Current Performance (2025-11-21)
- **HAKMEM**: 9.3M ops/s (Random Mixed 256B, 100K iterations)
- **System malloc**: 58.8M ops/s (baseline)
- **Performance gap**: 6.3x slower (15.8% of target)

### Bug Fixes Completed Today
1. **C7 Stride Upgrade Fix**
   - Fixed local stride table in tiny_block_stride_for_class() (1024→2048)
   - Disabled false positive NXT_MISALIGN checks
   - Removed redundant geometry validations

2. **C7 TLS SLL Corruption Fix**
   - Changed C7 offset from 1→0 (protect next pointer from user data)
   - Limited header restoration to C1-C6 only
   - Removed premature slab release from drain path

3. **Result**: 100% corruption elimination (0 errors / 200K iterations) ✅

### Performance Concern
- **Previous**: 25.1M ops/s (Phase 3d-C, 2025-11-20)
- **Current**: 9.3M ops/s (Bug Fix後, 2025-11-21)
- **Drop**: -63% performance regression ⚠️

**Possible causes**:
- C7 offset=0 overhead (header sacrifice impact?)
- TLS SLL drain changes
- Measurement variance (System malloc: 90M→58.8M)

**Next action**: Investigate performance drop root cause

📝 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 CLAUDE.md | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

diff --git a/CLAUDE.md b/CLAUDE.md
index d66750b9..a8586fd5 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -11,15 +11,42 @@
 
 ---
 
-## 📊 現在の性能（2025-11-20）
+## 📊 現在の性能（2025-11-21）
 
 ### ベンチマーク結果（Random Mixed 256B）
 ```
-HAKMEM (Phase 3d-C):  25.1M ops/s (+11.1% vs Phase 3d-B) ✅
-System malloc:        90M ops/s (baseline)
-性能差:               3.6倍遅い (27.9% of target)
+HAKMEM (Bug Fix後):  9.3M ops/s  ⚠️
+System malloc:       58.8M ops/s (baseline)
+性能差:              6.3倍遅い (15.8% of target)
 ```
 
+### 🔧 本日の修正（2025-11-21）
+1. **C7 Stride Upgrade Fix**: 1024B→2048B stride 移行の完全修正
+   - Local stride table 更新漏れを発見・修正
+   - False positive NXT_MISALIGN check を無効化
+   - 冗長な geometry validation を削除
+
+2. **C7 TLS SLL Corruption Fix**: User data による next pointer 上書きを防止
+   - C7 offset を 1→0 に変更（next pointer を user accessible 領域外に隔離）
+   - Header 復元を C1-C6 のみに限定
+   - Premature slab release を削除
+
+3. **結果**: 100% corruption 除去（0 errors / 200K iterations）✅
+
+### ⚠️ 性能低下の懸念
+```
+Phase 3d-C (2025-11-20): 25.1M ops/s (System比 27.9%)
+本日（Bug Fix後）:      9.3M ops/s  (System比 15.8%)
+性能差:                 -63% 低下
+```
+
+**原因候補**:
+- C7 offset=0 の影響（header 犠牲による overhead？）
+- TLS SLL drain 変更の影響
+- 測定誤差（System malloc: 90M→58.8M）
+
+**次のアクション**: 性能低下の原因調査が必要 🔍
+
 ### Phase 3d シリーズの成果 🎯
 1. **Phase 3d-A (SlabMeta Box)**: Box境界確立 - メタデータアクセスのカプセル化
 2. **Phase 3d-B (TLS Cache Merge)**: 22.6M ops/s - g_tls_sll[] 統合でL1D局所性向上