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Author SHA1 Message Date
Moe Charm (CI)
d5aa3110c6 Phase v7-5b: C5+C6 multi-class expansion (+4.3% improvement) 
- Add C5 (256B blocks) support alongside C6 (512B blocks)
- Same segment shared between C5/C6 (page_meta.class_idx distinguishes)
- SMALL_V7_CLASS_SUPPORTED() macro for class validation
- Extend small_v7_block_size() for C5 (switch statement)

A/B Result: C6-only v7 avg 7.64M ops/s → C5+C6 v7 avg 7.97M ops/s (+4.3%)
Criteria: C6 protected ✅, C5 net positive ✅, TLS bloat none ✅

ENV: HAKMEM_SMALL_HEAP_V7_CLASSES=0x60 (bit5+bit6)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 05:11:02 +09:00
Moe Charm (CI)
17ceed619c Phase v7-5a: Hot path stats removal (C6 v7 極限最適化) 
- Remove per-page stats from hot path (alloc_count, free_count, live_current)
- Add ENV-gated global atomic stats (HAKMEM_V7_HOT_STATS)
- Stats now collected only at retire time (cold path)
- Header write kept at alloc time (freelist overlaps block[0])

A/B Result: -4.3% overhead → ±0% (target: legacy ±2%)
v7 OFF avg: 9.26M ops/s, v7 ON avg: 9.27M ops/s (+0.15%)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 04:51:17 +09:00
Moe Charm (CI)
580e8f57f7 docs: V7 Architecture Decision Matrix (mimalloc 競争力評価) 
- mimalloc vs HAKMEM v7 feature-by-feature 比較表
- v7-5a vs v7-5b 決定基準フレームワーク
- Intrusive LIFO 採用検討
- TLS cache hit rate 目標
- Overhead 内訳の実測計画

結論: v7-5a (C6 極限最適化) を先に実施
目標: Intrusive LIFO + Headerless で mimalloc 同等性能

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 04:36:37 +09:00
Moe Charm (CI)
ea905b2ccb docs: HAKMEM v2 generation summary and Phase v7-4 completion 
- Add HAKMEM_V2_GENERATION_SUMMARY.md: comprehensive overview of v2 generation
- Update CURRENT_TASK.md: 'v2 generation complete' section
- Update SMALLOBJECT_V7_DESIGN.md: Phase v7-4 completion notes + v7-5 candidates

v2 generation freeze: ULTRA (FROZEN) / MID_v3 (stable) / v7 (research, code freeze)
Next: HakORune / JoinIR priority, HAKMEM resumes at v7-5 (multi-class expansion)

Layer structure (L0-L3) established, Box Theory implementation patterns confirmed.
Design documents serve as maps for future v7 second chapter.

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-12 04:00:55 +09:00
Moe Charm (CI)
8143e8b797 Phase v7-4: Policy Box 導入 (L3 層の明確化とフロント芯の作り直し) 
- SmallPolicyV7 Box: L3 Policy layer に配置、route 決定を一元化
- Route kind enum: SMALL_ROUTE_ULTRA / V7 / MID_V3 / LEGACY
- ENV priority (fixed): ULTRA > v7 > MID_v3 > LEGACY
- Frontend integration: v7 routing を Policy Box 経由に変更 (段階移行)
- Legacy compatibility: 既存の tiny_route_env_box.h は併用維持

Box Theory layer structure:
- L0: ULTRA (C4-C7, FROZEN)
- L1: SmallObject v7 (research box)
- L1': MID_v3 / LEGACY (fallback)
- L2: Segment / RegionId
- L3: Policy / Stats / Learner ← Policy Box added here

Frontend now follows clean "size→class→route_kind→switch" pattern.
ENV variables read once at Policy init, not scattered across frontend.

Future: ULTRA/MID_v3/LEGACY consolidation, Learner integration, flexible priority.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-12 03:50:58 +09:00
Moe Charm (CI)
0af409260d docs: Phase v7-2 results + Phase v7-3 design (TLS fast path + page_meta cache) 2025-12-12 03:13:13 +09:00
Moe Charm (CI)
39a3c53dbc Phase v7-2: SmallObject v7 C6-only implementation with RegionIdBox integration 
- SmallSegment_v7: 2MiB segment with TLS slot and free page stack
- ColdIface_v7: Page refill/retire between HotBox and SegmentBox
- HotBox_v7: Full C6-only alloc/free with header writing (HEADER_MAGIC|class_idx)
- Free path early-exit: Check v7 route BEFORE ss_fast_lookup (separate mmap segment)
- RegionIdBox: Register v7 segment for ptr->region lookup
- Benchmark: v7 ON ~54.5M ops/s (-7% overhead vs 58.6M legacy baseline)

v7 correctly balances alloc/free counts and page lifecycle.
RegionIdBox overhead identified as primary cost driver.

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-12 03:12:28 +09:00
Moe Charm (CI)
a8d0ab06fc MID-V3: Specialize to 257-768B, exclude C7 (ULTRA handles 1KB) 
Role separation based on ultrathink analysis:
- MID v3: 257-768B専用 (C6 only, HAKMEM_MID_V3_CLASSES=0x40)
- C7 ULTRA: 769-1024B専用 (existing optimized path)

Changes:
- core/box/hak_alloc_api.inc.h: Remove C7 route, restrict to 257-768B
- core/box/mid_hotbox_v3_env_box.h: Update ENV comments
- docs/analysis/MID_POOL_V3_DESIGN.md: Add performance results & role
- CURRENT_TASK.md: Document MID-V3 completion & role separation

Verified:
- 257-768B with v3 ON: 1,199,526 ops/s (+1.7% vs baseline)
- 769-1024B with v3 ON: 1,181,254 ops/s (same as baseline, C7 excluded)
- C7 correctly routes to ULTRA instead of MID v3

Rationale: C7-only showed -11% regression, but C6/mixed showed +11-19%
improvement. Specializing to mid-range (257-768B) leverages v3 strengths
while keeping C7 on the proven ULTRA path.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-12 01:14:13 +09:00
Moe Charm (CI)
2b35de2123 MID-V3 Phase 0-2: Design doc, type skeleton, and RegionIdBox API 
- MID-V3-0: Create design doc (docs/analysis/MID_POOL_V3_DESIGN.md)
  - Lane vs Page role clarification
  - Phase plan and checklist

- MID-V3-1: Type skeleton + ENV
  - MidHotBoxV3, MidLaneV3, MidPageDescV3 structures
  - ENV controls (HAKMEM_MID_V3_ENABLED, HAKMEM_MID_V3_CLASSES)
  - Cold interface declarations

- MID-V3-2 (V6-HDR-2): RegionIdBox Registration API completion
  - RegionEntry structure with sorted array storage
  - Binary search lookup implementation
  - region_id_register_v6() / region_id_unregister_v6()
  - REGION_KIND_MID_V3 added to enum

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 00:46:25 +09:00
Moe Charm (CI)
df216b6901 Phase V6-HDR-3: SmallSegmentV6 実割り当て & RegionIdBox Registration 
実装内容:
1. SmallSegmentV6のmmap割り当ては既に v6-0で実装済み
2. small_heap_ctx_v6() で segment 取得時に region_id_register_v6_segment() 呼び出し
3. region_id_v6.c に TLS スコープのセグメント登録ロジック実装:
   - 4つの static __thread 変数でセグメント情報をキャッシュ
   - region_id_register_v6_segment(): セグメント base/end を TLS に記録
   - region_id_lookup_v6(): TLS segment の range check を最初に実行
   - TLS cache 更新で O(1) lookup 実現
4. region_id_v6_box.h に SmallSegmentV6 type include & function 宣言追加
5. small_v6_region_observe_validate() に region_id_observe_lookup() 呼び出し追加

効果:
- HeaderlessデザインでRegionIdBoxが正式にSMALL_V6分類を返せるように
- TLS-scopedな簡潔な登録メカニズム (マルチスレッド対応)
- Fast path: TLS segment range check -> page_meta lookup
- Fall back path: 従来の small_page_meta_v6_of() による動的検出
- Latency: O(1) TLS cache hit rate がv6 alloc/free の大部分をカバー

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 23:51:48 +09:00
Moe Charm (CI)
406835feb3 Phase V6-HDR-0: C6-only headerless core 設計確定 
- CURRENT_TASK.md: V6-HDR-0 セクション追加（4層 Box Theory）
- SMALLOBJECT_CORE_V6_DESIGN.md: V6-HDR-0 設計方針追加
- REGIONID_V6_DESIGN.md: RegionIdBox 設計書新規作成
- smallobject_core_v6_box.h: SmallTlsLaneV6 型＋TLS API 追加
- smallobject_core_v6.c: OBSERVE モード追加
- region_id_v6_box.h: RegionIdBox 型スケルトン
- page_stats_v6_box.h: PageStatsV6 箱スケルトン
- AGENTS.md: v6 研究箱ルールセクション追加

サニティベンチ: Mixed 42.1M, C6-heavy 25.0M（挙動不変確認）

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-11 23:07:26 +09:00
Moe Charm (CI)
2d684ffd25 Phase SO-BACKEND-OPT-1: v3 backend 分解＆Tiny/ULTRA 完成世代宣言 
=== 実装内容 ===

1. v3 backend 詳細計測
   - ENV: HAKMEM_SO_V3_STATS で alloc/free パス内訳計測
   - 追加 stats: alloc_current_hit, alloc_partial_hit, free_current, free_partial, free_retire
   - so_alloc_fast / so_free_fast に埋め込み
   - デストラクタで [ALLOC_DETAIL] / [FREE_DETAIL] 出力

2. v3 backend ボトルネック分析完了
   - C7-only: alloc_current_hit=99.99%, alloc_refill=0.9%, free_retire=0.1%, page_of_fail=0
   - Mixed: alloc_current_hit=100%, alloc_refill=0.85%, free_retire=0.07%, page_of_fail=0
   - 結論: v3 ロジック部分（ページ選択・retire）は完全最適化済み
   - 残り 5% overhead は内部コスト（header write, memcpy, 分岐）

3. Tiny/ULTRA 層「完成世代」宣言
   - 総括ドキュメント作成: docs/analysis/PERF_EXEC_SUMMARY_ULTRA_PHASE_20251211.md
   - CURRENT_TASK.md に Phase ULTRA 総括セクション追加
   - AGENTS.md に Tiny/ULTRA 完成世代宣言追加
   - 最終成果: Mixed 16–1024B = 43.9M ops/s (baseline 30.6M → +43.5%)

=== ボトルネック地図 ===

| 層 | 関数 | overhead |
|-----|------|----------|
| Front | malloc/free dispatcher | ~40–45% |
| ULTRA | C4–C7 alloc/free/refill | ~12% |
| v3 backend | so_alloc/so_free | ~5% |
| mid/pool | hak_super_lookup | 3–5% |

=== フェーズ履歴（Phase ULTRA cycle） ===

- Phase PERF-ULTRA-FREE-OPT-1: C4–C7 ULTRA統合 → +9.3%
- Phase REFACTOR: Code quality (60行削減)
- Phase PERF-ULTRA-REFILL-OPT-1a/1b: C7 ULTRA refill最適化 → +11.1%
- Phase SO-BACKEND-OPT-1: v3 backend分解 → 設計限界確認

=== 次フェーズ（独立ライン） ===

1. Phase SO-BACKEND-OPT-2: v3 header write削減 (1-2%)
2. Headerless/v6系: out-of-band header (1-2%)
3. mid/pool v3新設計: C6-heavy 10M → 20–25M

本フェーズでTiny/ULTRA層は「完成世代」として基盤固定。
今後の大きい変更はHeaderless/mid系の独立ラインで検討。

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 22:45:14 +09:00
Moe Charm (CI)
17b6be518b Document Phase PERF-ULTRA-REFILL-OPT-1 plan: C7 ULTRA refill optimization 
Created comprehensive plan for next optimization phase:
- Target: tiny_c7_ultra_page_of (1.78% self%)
- Options: Page size macro, segment learning in alloc, TLS page cache
- Expected gain: 0.5-1% overall throughput improvement

All measurement and analysis phases completed for current iteration.
Next: Implement Phase PERF-ULTRA-REFILL-OPT-1
 2025-12-11 21:37:57 +09:00
Moe Charm (CI)
0f15adae4e Phase ALLOC-GATE-OPT-1: tiny_alloc_gate_fast 統計計測 
- AllocGateStats 構造体追加（size2class/route/env/class分布）
- malloc_tiny_fast にカウンタ埋め込み
- ENV: HAKMEM_ALLOC_GATE_STATS (default 0)
- 挙動変更なし（計測のみ）

計測結果:
- Mixed: total=542k, size2class=0, route_calls=0, env_checks=275k, C4-C7=95.2%
  - size_to_class/route_for_class は完全削減済み（LUT 効果）
  - C4-C7 が 95% → ULTRA fast path が有効
  - env_checks ≈ c7_calls → C7 ULTRA の ENV gate が毎回呼ばれる
- C6-heavy: total=11 → malloc_tiny_fast はほぼ通らない（mid/pool 主体）

結論:
- alloc gate は既に十分最適化済み（LUT + ULTRA で削減済み）
- さらなる最適化余地は小さい（env_checks は軽量化済み、数%以下の効果）
- 次フェーズでは free dispatcher (29%) や C7 ULTRA refill (7%) など、他のボトルネックを狙う

詳細: docs/analysis/ALLOC_GATE_ANALYSIS.md

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 21:32:40 +09:00
Moe Charm (CI)
118c0e4857 Phase FREE-DISPATCHER-OPT-1: free dispatcher 統計計測 
**目的**: free dispatcher（29%）の内訳を細分化して計測。

**実装内容**:
- FreeDispatchStats 構造体追加（ENV: HAKMEM_FREE_DISPATCH_STATS, default 0）
- カウンタ: total_calls / domain (tiny/mid/large) / route (ultra/legacy/pool/v6) / env_checks / route_for_class_calls
- hak_free_at / tiny_route_for_class / tiny_route_snapshot_init にカウンタ埋め込み
- 挙動変更なし（計測のみ、ENV OFF 時は overhead ゼロ）

**計測結果**:

Mixed 16-1024B (1M iter, ws=400):
- total=8,081, route_calls=267,967, env_checks=9
- BENCH_FAST_FRONT により大半は早期リターン
- route_for_class は主に alloc 側で呼ばれる（267k calls vs 8k frees）
- ENV check は初期化時の 9回のみ（snapshot 効果）

C6-heavy (257-768B, 1M iter, ws=400):
- total=500,099, route_calls=1,034, env_checks=9
- fg_classify_domain に到達する free が多い
- route_for_class 呼び出しは極小（snapshot 効果）

**結論**:
- ENV check は既に十分最適化されている（初期化時のみ）
- route_for_class は alloc 側での呼び出しが主で、free 側は snapshot で O(1)
- 次フェーズ（OPT-2）では別のアプローチを検討

**ドキュメント追加**:
- docs/analysis/FREE_DISPATCHER_ANALYSIS.md（新規）
- CURRENT_TASK.md に Phase FREE-DISPATCHER-OPT-1 セクション追加

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-11 21:21:40 +09:00
Moe Charm (CI)
11dc9d390a Phase PERF-ULTRA-FREE-OPT-1: C4-C7 ULTRA free 薄型化 
- C4-C7 ULTRA free を pure TLS push + cold segment learning に統一
- C7 ULTRA free を同じパターンに整列（likely/unlikely + FREE_PATH_STAT_INC）
- C4/C5/C6 ULTRA は既に最適化済み（統一 legacy fallback 経由）
- base/user 変換を tiny_ptr_convert_box.h マクロで統一

実測値 (Mixed 16-1024B, 1M iter, ws=400):
- Baseline (C7 のみ): 42.0M ops/s, legacy=266,943 (49.2%)
- Optimized (C4-C7): 46.5M ops/s, legacy=26,025 (4.8%)
- 改善: +9.3% (+4M ops/s)

FREE_PATH_STATS:
- C6 ULTRA: 137,319 free + 137,241 alloc (100% カバー)
- C5 ULTRA: 68,871 free + 68,827 alloc (100% カバー)
- C4 ULTRA: 34,727 free + 34,696 alloc (100% カバー)
- Legacy: 266,943 → 26,025 (−90.2%, C2/C3 のみ)

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 20:49:39 +09:00
Moe Charm (CI)
753909fa4d Phase PERF-ULTRA-ALLOC-OPT-1 (改訂版): C7 ULTRA 内部最適化 
設計判断:
- 寄生型 C7 ULTRA_FREE_BOX を削除（設計的に不整合）
- C7 ULTRA は C4/C5/C6 と異なり専用 segment + TLS を持つ独立サブシステム
- tiny_c7_ultra.c 内部で直接最適化する方針に統一

実装内容:
1. 寄生型パスの削除
   - core/box/tiny_c7_ultra_free_box.{h,c} 削除
   - core/box/tiny_c7_ultra_free_env_box.h 削除
   - Makefile から tiny_c7_ultra_free_box.o 削除
   - malloc_tiny_fast.h を元の tiny_c7_ultra_alloc/free 呼び出しに戻す

2. TLS 構造の最適化 (tiny_c7_ultra_box.h)
   - count を struct 先頭に移動（L1 cache locality 向上）
   - 配列ベース TLS キャッシュに変更（cap=128, C6 同等）
   - freelist: linked-list → BASE pointer 配列
   - cold フィールド（seg_base/seg_end/meta）を後方配置

3. alloc の純 TLS pop 化 (tiny_c7_ultra.c)
   - hot path: 1 分岐のみ（count > 0）
   - TLS access は 1 回のみ（ctx に cache）
   - ENV check を呼び出し側に移動
   - segment/page_meta アクセスは refill 時（cold path）のみ

4. free の UF-3 segment learning 維持
   - 最初の free で segment 学習（seg_base/seg_end を TLS に記憶）
   - 以降は範囲チェック → TLS push
   - 範囲外は v3 free にフォールバック

実測値 (Mixed 16-1024B, 1M iter, ws=400):
- tiny_c7_ultra_alloc self%: 7.66% (維持 - 既に最適化済み)
- tiny_c7_ultra_free self%: 3.50%
- Throughput: 43.5M ops/s

評価: 部分達成
- 設計一貫性の回復: 成功
- Array-based TLS cache 移行: 成功
- pure TLS pop パターン統一: 成功
- perf self% 削減（7.66% → 5-6%）: 未達成（既に最適）

C7 ULTRA は独立サブシステムとして tiny_c7_ultra.c に閉じる設計を維持。
次は refill path 最適化または C4-C7 ULTRA free 群の軽量化へ。

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-11 20:39:46 +09:00
Moe Charm (CI)
b381219a68 Phase PERF-ULTRA-REBASE-1 計測完了 + PERF-ULTRA-ALLOC-OPT-1 計画策定 
## Phase PERF-ULTRA-REBASE-1 実施
- C4-C7 ULTRA 全て ON 状態での CPU ホットパス計測
- Mixed 16-1024B, 10M cycles での perf 分析
- **発見**: C7 ULTRA alloc が新しい最大ボトルネック（7.66% self%）

## ホットパス分析結果
| 順位 | 関数 | self% |
|------|------|-------|
| #1 | C7 ULTRA alloc | **7.66%** ← 最大ボトルネック |
| #2 | C4-C7 ULTRA free群 | 5.41% |
| #3 | gate/front前段 | 2.51% ← 既に十分薄い |
| #4 | header | < 0.17% ← ULTRA で削減済み |

## 戦略転換（重要）
これまで: 新しい箱や世代（v4/v5/v6）を追加
→ 今後: 既に当たりが出ている ULTRA 内部を細かく削る

理由:
- v6/v5 拡張は -12〜33% の大幅回帰
- gate/front や header はもう改善の余地が少ない
- C7 ULTRA alloc の 7.66% → 5-6% 削減で全体効果 2-3%

## Phase PERF-ULTRA-ALLOC-OPT-1 計画策定
- ターゲット: tiny_c7_ultra_alloc() の hot path を直線化
- 施策:
  1. TLS ヒットパスの直線化（env check/snapshot 削除）
  2. TLS freelist レイアウト最適化（L1 キャッシュ親和性）
  3. segment/page_meta アクセスの確認（slow path 確認）
- 計測: C7-only + Mixed での A/B テスト
- 期待: 7.66% → 5-6%、全体で +2-3M ops/s

## ドキュメント更新
- CURRENT_TASK.md: PERF-ULTRA-REBASE-1 結果と ALLOC-OPT-1 計画を追記
- TINY_C7_ULTRA_DESIGN.md: Phase PERF-ULTRA-ALLOC-OPT-1 セクション追加
- NEW: docs/analysis/PERF_ULTRA_ALLOC_OPT_1_PLAN.md - 詳細な実装計画書

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 20:05:09 +09:00
Moe Charm (CI)
7b7de53167 Phase FREE-FRONT-V3-1: Free route snapshot infrastructure + build fix 
Summary:
========
Implemented Phase FREE-FRONT-V3 infrastructure to optimize free hotpath by:
1. Creating snapshot-based route decision table (consolidating route logic)
2. Removing redundant ENV checks from hot path
3. Preparing for future integration into hak_free_at()

Key Changes:
============

1. NEW FILES:
   - core/box/free_front_v3_env_box.h: Route snapshot definition & API
   - core/box/free_front_v3_env_box.c: Snapshot initialization & caching

2. Infrastructure Details:
   - FreeRouteSnapshotV3: Maps class_idx → free_route_kind for all 8 classes
   - Routes defined: LEGACY, TINY_V3, CORE_V6_C6, POOL_V1
   - ENV-gated initialization (HAKMEM_TINY_FREE_FRONT_V3_ENABLED, default OFF)
   - Per-thread TLS caching to avoid repeated ENV reads

3. Design Goals:
   - Consolidate tiny_route_for_class() results into snapshot table
   - Remove C7 ULTRA / v4 / v5 / v6 ENV checks from hot path
   - Limit lookup (ss_fast_lookup/slab_index_for) to paths that truly need it
   - Clear ownership boundary: front v3 handles routing, downstream handles free

4. Phase Plan:
   - v3-1 ✅ COMPLETE: Infrastructure (snapshot table, ENV initialization, TLS cache)
   - v3-2 (INFRASTRUCTURE ONLY): Placeholder integration in hak_free_api.inc.h
   - v3-3 (FUTURE): Full integration + benchmark A/B to measure hotpath improvement

5. BUILD FIX:
   - Added missing core/box/c7_meta_used_counter_box.o to OBJS_BASE in Makefile
   - This symbol was referenced but not linked, causing undefined reference errors
   - Benchmark targets now build cleanly without LTO

Status:
=======
- Build: ✅ PASS (bench_allocators_hakmem builds without errors)
- Integration: Currently DISABLED (default OFF, ready for v3-2 phase)
- No performance impact: Infrastructure-only, hotpath unchanged

Future Work:
============
- Phase v3-2: Integrate snapshot routing into hak_free_at() main path
- Phase v3-3: Measure free hotpath performance improvement (target: 1-2% less branch mispredict)

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 19:17:30 +09:00
Moe Charm (CI)
224cc8d1ca Docs: Phase FREE-LEGACY-OPT-4-4 completion summary + design notes 
Phase 4-4 で C6 ULTRA free+alloc 統合（寄生型 TLS キャッシュ）が完了。
- Mixed 16-1024B: 40.2M → 42.3M ops/s (+5.2%)
- C6 legacy 完全排除: 137,319 → 0 (-100%)
- Legacy 半減: 266,942 → 129,623 (-51.4%)
- 次ターゲット: C5 (残存 Legacy の 53.1%)

設計メモを FREE_LEGACY_PATH_ANALYSIS.md に追記:
- Free-only TLS が失敗する理由
- Free+alloc 統合で成功する理由
- 寄生型 TLS キャッシュの設計原理
- C5/C4 への一般化可能性

次フェーズ候補を CURRENT_TASK.md に追記:
- 選択肢 1: C5 ULTRA への展開
- 選択肢 2: Tiny Alloc Hotpath 最適化
- 判断ポイント: stats 確認後に決定

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 19:11:44 +09:00
Moe Charm (CI)
6eb78fa26c Docs: Phase FREE-LEGACY-OPT-4-4 analysis and results 2025-12-11 18:47:44 +09:00
Moe Charm (CI)
1b196b3ac0 Phase FREE-LEGACY-OPT-4-2/4-3: C6 ULTRA-free TLS cache + segment learning 
Phase 4-2:
- Add TinyC6UltraFreeTLS structure with 128-slot TLS freelist
- Implement tiny_c6_ultra_free_fast/slow for C6 free hot path
- Add c6_ultra_free_fast counter to FreePathStats
- ENV gate: HAKMEM_TINY_C6_ULTRA_FREE_ENABLED (default: OFF)

Phase 4-3:
- Add segment learning on first C6 free via ss_fast_lookup()
- Learn seg_base/seg_end from SuperSlab for range check
- Increase cache capacity from 32 to 128 blocks

Results:
- Segment learning works: fast path captures blocks in segment
- However, without alloc integration, cache fills up and overflows to legacy
- Net effect: +1-3% (within noise range)
- Drain strategy also tested: no benefit (equal overhead)

Conclusion:
- Free-only TLS cache is limited without alloc-side integration
- Core v6 already has alloc/free integrated TLS (but -12% slower)
- Keep as research box (ENV default OFF)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-11 18:34:27 +09:00
Moe Charm (CI)
210633117a Phase FREE-LEGACY-OPT-4-1: Legacy per-class breakdown analysis 
## 目的
Legacy fallback 49.2% の内訳を per-class で分析し、最も Legacy を使用しているクラスを特定。

## 実装内容

1. FreePathStats 構造体の拡張
   - legacy_by_class[8] フィールドを追加（C0-C7 の Legacy fallback 内訳）

2. デストラクタ出力の更新
   - [FREE_PATH_STATS_LEGACY_BY_CLASS] 行を追加し、C0-C7 の内訳を出力

3. カウンタの散布
   - free_tiny_fast() の Legacy fallback 経路で legacy_by_class[class_idx] をインクリメント
   - class_idx の範囲チェック（0-7）を実施

## 測定結果（Mixed 16-1024B）

**測定安定性**: 完全に安定（3 回とも同一の値、決定的測定）

Legacy per-class 内訳:
- C0: 0 (0.0%)
- C1: 0 (0.0%)
- C2: 8,746 (3.3% of legacy)
- C3: 17,279 (6.5% of legacy)
- C4: 34,727 (13.0% of legacy)
- C5: 68,871 (25.8% of legacy)
- C6: 137,319 (51.4% of legacy) ← 最大シェア
- C7: 0 (0.0%)

合計: 266,942 (49.2% of total free calls)

## 分析結果

**最大シェアクラス**: C6 (513-1024B) が Legacy の 51.4% を占める

**理由**:
- Mixed 16-1024B では C6 サイズのアロケーションが多い
- C7 ULTRA は C7 専用で C6 は未対応
- v3/v4 も C6 をカバーしていない
- Route 設定で C6 は Legacy に直接落ちている

## 次のアクション

Phase FREE-LEGACY-OPT-4-2 で C6 クラスに ULTRA-Free lane を実装:
- Legacy fallback を 51% 削減（C6 分）
- Legacy: 49.2% → 24-27% に改善（半減）
- Mixed 16-1024B: 44.8M → 47-48M ops/s 程度（+5-8% 改善）

## 変更ファイル

- core/box/free_path_stats_box.h: FreePathStats 構造体に legacy_by_class[8] 追加
- core/box/free_path_stats_box.c: デストラクタに per-class 出力追加
- core/front/malloc_tiny_fast.h: Legacy fallback 経路に per-class カウンタ追加
- docs/analysis/FREE_LEGACY_PATH_ANALYSIS.md: Phase 4-1 分析結果を記録

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-11 18:04:14 +09:00
Moe Charm (CI)
c60199182e Phase v6-1/2/3/4: SmallObject Core v6 - C6-only implementation + refactor 
Phase v6-1: C6-only route stub (v1/pool fallback)
Phase v6-2: Segment v6 + ColdIface v6 + Core v6 HotPath implementation
  - 2MiB segment / 64KiB page allocation
  - O(1) ptr→page_meta lookup with segment masking
  - C6-heavy A/B: SEGV-free but -44% performance (15.3M ops/s)

Phase v6-3: Thin-layer optimization (TLS ownership check + batch header + refill batching)
  - TLS ownership fast-path skip page_meta for 90%+ of frees
  - Batch header writes during refill (32 allocs = 1 header write)
  - TLS batch refill (1/32 refill frequency)
  - C6-heavy A/B: v6-2 15.3M → v6-3 27.1M ops/s (±0% vs baseline) ✅

Phase v6-4: Mixed hang fix (segment metadata lookup correction)
  - Root cause: metadata lookup was reading mmap region instead of TLS slot
  - Fix: use TLS slot descriptor with in_use validation
  - Mixed health: 5M iterations SEGV-free, 35.8M ops/s ✅

Phase v6-refactor: Code quality improvements (macro unification + inline + docs)
  - Add SMALL_V6_* prefix macros (header, pointer conversion, page index)
  - Extract inline validation functions (small_page_v6_valid, small_ptr_in_segment_v6)
  - Doxygen-style comments for all public functions
  - Result: 0 compiler warnings, maintained +1.2% performance

Files:
- core/box/smallobject_core_v6_box.h (new, type & API definitions)
- core/box/smallobject_cold_iface_v6.h (new, cold iface API)
- core/box/smallsegment_v6_box.h (new, segment type definitions)
- core/smallobject_core_v6.c (new, C6 alloc/free implementation)
- core/smallobject_cold_iface_v6.c (new, refill/retire logic)
- core/smallsegment_v6.c (new, segment allocator)
- docs/analysis/SMALLOBJECT_CORE_V6_DESIGN.md (new, design document)
- core/box/tiny_route_env_box.h (modified, v6 route added)
- core/front/malloc_tiny_fast.h (modified, v6 case in route switch)
- Makefile (modified, v6 objects added)
- CURRENT_TASK.md (modified, v6 status added)

Status:
- C6-heavy: v6 OFF 27.1M → v6-3 ON 27.1M ops/s (±0%) ✅
- Mixed: v6 ON 35.8M ops/s (C6-only, other classes via v1) ✅
- Build: 0 warnings, fully documented ✅

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 15:29:59 +09:00
Moe Charm (CI)
9c24bebf08 Phase v5-1: SmallObject v5 C6-only route stub 接続 
- tiny_route_env_box.h: TINY_ROUTE_SMALL_HEAP_V5 enum 追加、route snapshot で C6→v5 分岐
- malloc_tiny_fast.h: alloc/free switch に v5 case 追加（v1/pool fallback）
- smallobject_hotbox_v5.c: stub 実装（alloc は NULL 返却、free は no-op）
- smallobject_hotbox_v5_box.h: 関数 signature に ctx パラメータ追加
- Makefile: core/smallobject_hotbox_v5.o をリンクリストに追加
- ENV_PROFILE_PRESETS.md: v5-1 プリセット追記
- CURRENT_TASK.md: Phase v5-1 完了記録

**特性**:
- ENV: HAKMEM_SMALL_HEAP_V5_ENABLED=1 / HAKMEM_SMALL_HEAP_V5_CLASSES=0x40 で opt-in
- テスト結果: C6-heavy (v5 OFF 15.5M → v5 ON 16.4M ops/s, 正常), Mixed 47.2M ops/s, SEGV/assert なし
- 挙動は v1/pool fallback と同じ（実装は v5-2）

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 03:25:37 +09:00
Moe Charm (CI)
83d4096fbc Phase v5-0: SmallObject v5 の設計・型/IF/ENV スケルトン追加 
設計ドキュメント:
- docs/analysis/SMALLOBJECT_V5_DESIGN.md: v5 アーキテクチャ全体設計

新規ファイル (v5 スケルトン):
- core/box/smallobject_hotbox_v5_box.h: HotBox v5 型定義
- core/box/smallsegment_v5_box.h: Segment v5 型定義
- core/box/smallobject_cold_iface_v5.h: ColdIface v5 IF宣言
- core/box/smallobject_v5_env_box.h: ENV ゲート
- core/smallobject_hotbox_v5.c: 実装 stub (完全 fallback)

特徴:
✅ 型とインターフェースのみ定義（v5-0 は機能なし）
✅ ENV デフォルト OFF（HAKMEM_SMALL_HEAP_V5_ENABLED=0）
✅ 挙動完全不変（Mixed/C6 benchmark 確認済み）
✅ v4 との区別を明確化 (*_v5 suffix)
✅ v5-1 (stub) → v5-2 (本実装) → v5-3 (Mixed) への段階実装準備完了

フェーズ:
- v5-0: 型定義のみ（現在）
- v5-1: C6-only stub route 追加
- v5-2: Segment/HotBox 本実装 (C6-only bench A/B)
- v5-3: Mixed での段階昇格 (C6 → C5 → ...)

目標性能: Mixed 16–1024B で 50–60M ops/s (mimalloc の 5割)

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 03:09:57 +09:00
Moe Charm (CI)
dd974b49c5 Phase v4-mid-2, v4-mid-3, v4-mid-5: SmallObject HotBox v4 implementation and docs update 
Implementation:
- SmallObject HotBox v4 (core/smallobject_hotbox_v4.c) now fully implements C6-only allocations and frees, including current/partial management and freelist operations.
- Cold Iface (tiny_heap based) for page refill/retire is integrated.
- Stats instrumentation (v4-mid-5) added to small_heap_alloc_fast_v4 and small_heap_free_fast_v4, with a new header file core/box/smallobject_hotbox_v4_stats_box.h and atexit dump function.

Updates:
- CURRENT_TASK.md has been condensed and updated with summaries of Phase v4-mid-2 (C6-only v4), Phase v4-mid-3 (C5-only v4 pilot), and the stats implementation (v4-mid-5).
- docs/analysis/SMALLOBJECT_V4_BOX_DESIGN.md updated with A/B results and conclusions for C6-only and C5-only v4 implementations.
- The previous CURRENT_TASK.md content has been archived to CURRENT_TASK_ARCHIVE_20251210.md.
 2025-12-11 01:01:15 +09:00
Moe Charm (CI)
3b4449d773 Phase v4-mid-1: C6-only v4 route + page_meta_of() Fail-Fast validation 
Implementation:
- SMALL_SEGMENT_V4_* constants (SIZE=2MiB, PAGE_SIZE=64KiB, MAGIC=0xDEADBEEF)
- smallsegment_v4_page_meta_of(): O(1) mask+shift lookup with magic validation
  - Computes segment base: addr & ~(2MiB - 1)
  - Verifies SmallSegment magic number
  - Calculates page_idx: (addr - seg_base) >> PAGE_SHIFT (16)
  - Returns non-NULL sentinel for now (full page_meta[] in Phase v4-mid-2)

Stubs for C6-only phase:
- small_heap_alloc_fast_v4(): C6 returns NULL → pool v1 fallback
- small_heap_free_fast_v4(): C6 calls page_meta_of() for Fail-Fast, then pool v1 fallback

Documentation:
- ENV_PROFILE_PRESETS.md: Add "C6_ONLY_SMALLOBJECT_V4" research profile
  - HAKMEM_SMALL_HEAP_V4_ENABLED=1, HAKMEM_SMALL_HEAP_V4_CLASSES=0x40
  - Expected: Throughput ≈ 28–29M ops/s (same as v1)

Build:
- ビルド成功（警告のみ）
- Backward compatible, alloc/free stubs fall back to pool v1

Sanity:
- C6-heavy with v4 opt-in: segv/assert なし
- page_meta_of() lookup working correctly
- Performance unchanged (expected for stub phase)

Status:
- C6-only v4 route now available via ENV opt-in
- Phase v4-mid-2: SmallHeapCtx v4 full implementation with A/B

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 23:37:45 +09:00
Moe Charm (CI)
e3e4cab833 Cleanup: Unify type naming and Cold Iface architecture 
Refactoring:
- Type naming: Rename small_page_v4 → SmallPageMeta, small_class_heap_v4 → SmallClassHeap, small_heap_ctx_v4 → SmallHeapCtx
- Keep backward compatibility aliases for existing code
- SmallSegment struct unified, clean forward declarations
- Cold Iface: Remove vtable (SmallColdIfaceV4 struct) in favor of direct function calls
- Simplify refill_page/retire_page to direct calls, not callbacks
- smallobject_hotbox_v4.c: Update to call small_cold_v4_* functions directly

Documentation:
- Add docs/analysis/ENV_CLEANUP_CANDIDATES.md
- Categorize ENVs: KEEP (production), RESEARCH (opt-in), DELETE (obsolete)
- v2 code: Keep as research infrastructure (complete, safe, gated)
- v4 code: Research scaffold for future mid-level allocator

Build:
- ビルド成功（警告のみ）
- Backward compatible, all existing code still works

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 23:30:32 +09:00
Moe Charm (CI)
52c65da783 Phase v4-mid-0: Small-object v4 型・IF 足場（箱化モジュール化） 
- SmallHeapCtx/SmallPageMeta/SmallClassHeap typedef alias 追加
- SmallSegment struct (base/num_pages/owner_tid/magic) を smallsegment_v4_box.h に定義
- SmallColdIface_v4 direct function prototypes (refill/retire/remote_push/drain)
- smallobject_hotbox_v4.c の internal/public API 分離（small_segment_v4_internal）
- direct function stubs 実装（SmallColdIfaceV4 delegate 形式）
- ENV OFF デフォルト（ENABLED=0/CLASSES=0）で既存挙動 100% 不変
- ビルド成功・sanity 確認（mixed/C6-heavy、segv/assert なし）
- CURRENT_TASK.md に Phase v4-mid-0 記録

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 23:23:07 +09:00
Moe Charm (CI)
2a13478dc7 Optimize C6 heavy and C7 ultra performance analysis with refined design refinements 
- Update environment profile presets and visibility analysis
- Enhance small object and tiny segment v4 box implementations
- Refine C7 ultra and C6 heavy allocation strategies
- Add comprehensive performance metrics and design documentation

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 22:57:26 +09:00
Moe Charm (CI)
bbb55b018a Add C7 ULTRA segment skeleton and TLS freelist 2025-12-10 22:19:32 +09:00
Moe Charm (CI)
f2ce7256cd Add v4 C7/C6 fast classify and small-segment v4 scaffolding 2025-12-10 19:14:38 +09:00
Moe Charm (CI)
3261025995 Phase v4-4: pilot C6 v4 route with opt-in gate 2025-12-10 18:18:05 +09:00
Moe Charm (CI)
cbd33511eb Phase v4-3.1: reuse C7 v4 pages and record prep calls 2025-12-10 17:58:42 +09:00
Moe Charm (CI)
d576116484 Document current Mixed baseline throughput and ENV profile 2025-12-10 14:12:13 +09:00
Moe Charm (CI)
406a2f4d26 Incremental improvements: mid_desc cache, pool hotpath optimization, and doc updates 
**Changes:**
- core/box/pool_api.inc.h: Code organization and micro-optimizations
- CURRENT_TASK.md: Updated Phase MD1 (mid_desc TLS cache: +3.2% for C6-heavy)
- docs/analysis files: Various analysis and documentation updates
- AGENTS.md: Agent role clarifications
- TINY_FRONT_V3_FLATTENING_GUIDE.md: Flattening strategy documentation

**Verification:**
- random_mixed_hakmem: 44.8M ops/s (1M iterations, 400 working set)
- No segfaults or assertions across all benchmark variants
- Stable performance across multiple runs

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 14:00:57 +09:00
Moe Charm (CI)
0e5a2634bc Phase 82 Final: Documentation of mid_desc race fix and comprehensive A/B results 
**Implementation Summary:**
- Early `mid_desc_init_once()` in `hak_pool_init_impl()` prevents uninitialized mutex crash
- Eliminates race condition that caused C7_SAFE + flatten crashes
- Enables safe operation across all profiles (C7_SAFE, LEGACY)

**Benchmark Results (C6_HEAVY_LEGACY_POOLV1, Release):**
- Phase 1 (Baseline): 3.03M / 14.86M / 26.67M ops/s (10K/100K/1M)
- Phase 2 (Zero Mode): +5.0% / -2.7% / -0.2%
- Phase 3 (Flatten): +3.7% / +6.1% / -5.0%
- Phase 4 (Combined): -5.1% / +8.8% / +2.0% (best at 100K: +8.8%)
- Phase 5 (C7_SAFE Safety): NO CRASH ✅ (all iterations stable)

**Mainline Policy:**
- mid_desc initialization: Always enabled (crash prevention)
- Flatten: Default OFF (bench opt-in via HAKMEM_POOL_V1_FLATTEN_ENABLED=1)
- Zero Mode: Default FULL (bench opt-in via HAKMEM_POOL_ZERO_MODE=header)
- Workload-specific: Medium (100K) benefits most (+8.8%)

**Documentation Updated:**
- CURRENT_TASK.md: Added Phase 82 conclusions with benchmark table
- MID_LARGE_CPU_HOTPATH_ANALYSIS.md: Added Phase 82 Final with workload analysis

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 09:35:18 +09:00
Moe Charm (CI)
acc64f2438 Phase ML1: Pool v1 memset 89.73% overhead 軽量化 (+15.34% improvement) 
## Summary
- ChatGPT により bench_profile.h の setenv segfault を修正（RTLD_NEXT 経由に切り替え）
- core/box/pool_zero_mode_box.h 新設：ENV キャッシュ経由で ZERO_MODE を統一管理
- core/hakmem_pool.c で zero mode に応じた memset 制御（FULL/header/off）
- A/B テスト結果：ZERO_MODE=header で +15.34% improvement（1M iterations, C6-heavy）

## Files Modified
- core/box/pool_api.inc.h: pool_zero_mode_box.h include
- core/bench_profile.h: glibc setenv → malloc+putenv（segfault 回避）
- core/hakmem_pool.c: zero mode 参照・制御ロジック
- core/box/pool_zero_mode_box.h (新設): enum/getter
- CURRENT_TASK.md: Phase ML1 結果記載

## Test Results
| Iterations | ZERO_MODE=full | ZERO_MODE=header | Improvement |
|-----------|----------------|-----------------|------------|
| 10K       | 3.06 M ops/s   | 3.17 M ops/s    | +3.65%     |
| 1M        | 23.71 M ops/s  | 27.34 M ops/s   | **+15.34%** |

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 09:08:18 +09:00
Moe Charm (CI)
a905e0ffdd Guard madvise ENOMEM and stabilize pool/tiny front v3 2025-12-09 21:50:15 +09:00
Moe Charm (CI)
e274d5f6a9 pool v1 flatten: break down free fallback causes and normalize mid_desc keys 2025-12-09 19:34:54 +09:00
Moe Charm (CI)
8f18963ad5 Phase 36-37: TinyHotHeap v2 HotBox redesign and C7 current_page policy fixes 
- Redefine TinyHotHeap v2 as per-thread Hot Box with clear boundaries
- Add comprehensive OS statistics tracking for SS allocations
- Implement route-based free handling for TinyHeap v2
- Add C6/C7 debugging and statistics improvements
- Update documentation with implementation guidelines and analysis
- Add new box headers for stats, routing, and front-end management
 2025-12-08 21:30:21 +09:00
Moe Charm (CI)
34a8fd69b6 C7 v2: add lease helpers and v2 page reset 2025-12-08 14:40:03 +09:00
Moe Charm (CI)
9502501842 Fix tiny lane success handling for TinyHeap routes 2025-12-07 23:06:50 +09:00
Moe Charm (CI)
a6991ec9e4 Add TinyHeap class mask and extend routing 2025-12-07 22:49:28 +09:00
Moe Charm (CI)
9c68073557 C7 meta-light delta flush threshold and clamp 2025-12-07 22:42:02 +09:00
Moe Charm (CI)
fda6cd2e67 Boxify superslab registry, add bench profile, and document C7 hotpath experiments 2025-12-07 03:12:27 +09:00
Moe Charm (CI)
984cca41ef P0 Optimization: Shared Pool fast path with O(1) metadata lookup 
Performance Results:
- Throughput: 2.66M ops/s → 3.8M ops/s (+43% improvement)
- sp_meta_find_or_create: O(N) linear scan → O(1) direct pointer
- Stage 2 metadata scan: 100% → 10-20% (80-90% reduction via hints)

Core Optimizations:

1. O(1) Metadata Lookup (superslab_types.h)
   - Added `shared_meta` pointer field to SuperSlab struct
   - Eliminates O(N) linear search through ss_metadata[] array
   - First access: O(N) scan + cache | Subsequent: O(1) direct return

2. sp_meta_find_or_create Fast Path (hakmem_shared_pool.c)
   - Check cached ss->shared_meta first before linear scan
   - Cache pointer after successful linear scan for future lookups
   - Reduces 7.8% CPU hotspot to near-zero for hot paths

3. Stage 2 Class Hints Fast Path (hakmem_shared_pool_acquire.c)
   - Try class_hints[class_idx] FIRST before full metadata scan
   - Uses O(1) ss->shared_meta lookup for hint validation
   - __builtin_expect() for branch prediction optimization
   - 80-90% of acquire calls now skip full metadata scan

4. Proper Initialization (ss_allocation_box.c)
   - Initialize shared_meta = NULL in superslab_allocate()
   - Ensures correct NULL-check semantics for new SuperSlabs

Additional Improvements:
- Updated ptr_trace and debug ring for release build efficiency
- Enhanced ENV variable documentation and analysis
- Added learner_env_box.h for configuration management
- Various Box optimizations for reduced overhead

Thread Safety:
- All atomic operations use correct memory ordering
- shared_meta cached under mutex protection
- Lock-free Stage 2 uses proper CAS with acquire/release semantics

Testing:
- Benchmark: 1M iterations, 3.8M ops/s stable
- Build: Clean compile RELEASE=0 and RELEASE=1
- No crashes, memory leaks, or correctness issues

Next Optimization Candidates:
- P1: Per-SuperSlab free slot bitmap for O(1) slot claiming
- P2: Reduce Stage 2 critical section size
- P3: Page pre-faulting (MAP_POPULATE)

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-04 16:21:54 +09:00
Moe Charm (CI)
0546454168 WIP: Add TLS SLL validation and SuperSlab registry fallback 
ChatGPT's diagnostic changes to address TLS_SLL_HDR_RESET issue.
Current status: Partial mitigation, but root cause remains.

Changes Applied:
1. SuperSlab Registry Fallback (hakmem_super_registry.h)
   - Added legacy table probe when hash map lookup misses
   - Prevents NULL returns for valid SuperSlabs during initialization
   - Status: ✅ Works but may hide underlying registration issues

2. TLS SLL Push Validation (tls_sll_box.h)
   - Reject push if SuperSlab lookup returns NULL
   - Reject push if class_idx mismatch detected
   - Added [TLS_SLL_PUSH_NO_SS] diagnostic message
   - Status: ✅ Prevents list corruption (defensive)

3. SuperSlab Allocation Class Fix (superslab_allocate.c)
   - Pass actual class_idx to sp_internal_allocate_superslab
   - Prevents dummy class=8 causing OOB access
   - Status: ✅ Root cause fix for allocation path

4. Debug Output Additions
   - First 256 push/pop operations traced
   - First 4 mismatches logged with details
   - SuperSlab registration state logged
   - Status: ✅ Diagnostic tool (not a fix)

5. TLS Hint Box Removed
   - Deleted ss_tls_hint_box.{c,h} (Phase 1 optimization)
   - Simplified to focus on stability first
   - Status: ⏳ Can be re-added after root cause fixed

Current Problem (REMAINS UNSOLVED):
- [TLS_SLL_HDR_RESET] still occurs after ~60 seconds of sh8bench
- Pointer is 16 bytes offset from expected (class 1 → class 2 boundary)
- hak_super_lookup returns NULL for that pointer
- Suggests: Use-After-Free, Double-Free, or pointer arithmetic error

Root Cause Analysis:
- Pattern: Pointer offset by +16 (one class 1 stride)
- Timing: Cumulative problem (appears after 60s, not immediately)
- Location: Header corruption detected during TLS SLL pop

Remaining Issues:
⚠️ Registry fallback is defensive (may hide registration bugs)
⚠️ Push validation prevents symptoms but not root cause
⚠️ 16-byte pointer offset source unidentified

Next Steps for Investigation:
1. Full pointer arithmetic audit (Magazine ⇔ TLS SLL paths)
2. Enhanced logging at HDR_RESET point:
   - Expected vs actual pointer value
   - Pointer provenance (where it came from)
   - Allocation trace for that block
3. Verify Headerless flag is OFF throughout build
4. Check for double-offset application in conversions

Technical Assessment:
- 60% root cause fixes (allocation class, validation)
- 40% defensive mitigation (registry fallback, push rejection)

Performance Impact:
- Registry fallback: +10-30 cycles on cold path (negligible)
- Push validation: +5-10 cycles per push (acceptable)
- Overall: < 2% performance impact estimated

Related Issues:
- Phase 1 TLS Hint Box removed temporarily
- Phase 2 Headerless blocked until stability achieved

🤖 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-03 20:42:28 +09:00
Moe Charm (CI)
dc9e650db3 Tiny Pool redesign: P0.1, P0.3, P1.1, P1.2 - Out-of-band class_idx lookup 
This commit implements the first phase of Tiny Pool redesign based on
ChatGPT architecture review. The goal is to eliminate Header/Next pointer
conflicts by moving class_idx lookup out-of-band (to SuperSlab metadata).

## P0.1: C0(8B) class upgraded to 16B
- Size table changed: {16,32,64,128,256,512,1024,2048} (8 classes)
- LUT updated: 1..16 → class 0, 17..32 → class 1, etc.
- tiny_next_off: C0 now uses offset 1 (header preserved)
- Eliminates edge cases for 8B allocations

## P0.3: Slab reuse guard Box (tls_slab_reuse_guard_box.h)
- New Box for draining TLS SLL before slab reuse
- ENV gate: HAKMEM_TINY_SLAB_REUSE_GUARD=1
- Prevents stale pointers when slabs are recycled
- Follows Box theory: single responsibility, minimal API

## P1.1: SuperSlab class_map addition
- Added uint8_t class_map[SLABS_PER_SUPERSLAB_MAX] to SuperSlab
- Maps slab_idx → class_idx for out-of-band lookup
- Initialized to 255 (UNASSIGNED) on SuperSlab creation
- Set correctly on slab initialization in all backends

## P1.2: Free fast path uses class_map
- ENV gate: HAKMEM_TINY_USE_CLASS_MAP=1
- Free path can now get class_idx from class_map instead of Header
- Falls back to Header read if class_map returns invalid value
- Fixed Legacy Backend dynamic slab initialization bug

## Documentation added
- HAKMEM_ARCHITECTURE_OVERVIEW.md: 4-layer architecture analysis
- TLS_SLL_ARCHITECTURE_INVESTIGATION.md: Root cause analysis
- PTR_LIFECYCLE_TRACE_AND_ROOT_CAUSE_ANALYSIS.md: Pointer tracking
- TINY_REDESIGN_CHECKLIST.md: Implementation roadmap (P0-P3)

## Test results
- Baseline: 70% success rate (30% crash - pre-existing issue)
- class_map enabled: 70% success rate (same as baseline)
- Performance: ~30.5M ops/s (unchanged)

## Next steps (P1.3, P2, P3)
- P1.3: Add meta->active for accurate TLS/freelist sync
- P2: TLS SLL redesign with Box-based counting
- P3: Complete Header out-of-band migration

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-28 13:42:39 +09:00