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Author SHA1 Message Date
Moe Charm (CI)
b2724e6f5d Phase ALLOC-TINY-FAST-DUALHOT-1: WIP (regression), FREE DUALHOT confirmed +13% 
**ALLOC-TINY-FAST-DUALHOT-1** (this phase):
- Implementation: malloc_tiny_fast() C0-C3 early-exit with policy snapshot skip
- ENV: HAKMEM_TINY_ALLOC_DUALHOT=0/1 (default OFF)
- A/B Result: -1.17% median regression (Mixed, 10-run)
- Root Cause: Branch prediction penalty on C4-C7 outweighs policy skip benefit
- Decision: Freeze as research box (default OFF)
- Difference from FREE: ALLOC requires structural changes (per-class paths)

**FREE-TINY-FAST-DUALHOT-1** (verified):
- A/B Confirmation: +13.00% improvement (42.08M → 47.81M ops/s, Mixed, 10-run)
- Success Criteria: +2% target ACHIEVED
- Health Check: PASS (verify_health_profiles.sh, ENV OFF/ON)
- Safety: HAKMEM_TINY_LARSON_FIX guard in place
- Decision: Promotion to MIXED_TINYV3_C7_SAFE profile candidate

**Next Steps**:
- Profile adoption of FREE DUALHOT for MIXED workload
- No further deep-dive on ALLOC optimization (deferred to future phases)

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-13 05:10:45 +09:00
Moe Charm (CI)
0a7400d7d3 Phase ALLOC-TINY-FAST-DUALHOT-1: C0-C3 alloc direct path (WIP, -2% regression) 
Add C0-C3 early-exit optimization to malloc_tiny_fast() similar to
FREE-TINY-FAST-DUALHOT-1. Skip policy snapshot for C0-C3 classes.

A/B Result (10-run, Mixed TINYV3_C7_SAFE):
- Baseline: 47.27M ops/s (median)
- Optimized: 46.10M ops/s (median)
- Result: -2.00% (regression, needs investigation)

ENV: HAKMEM_TINY_ALLOC_DUALHOT=0/1 (default OFF)

Implementation:
- core/front/malloc_tiny_fast.h: alloc_dualhot_enabled() + early-exit
- Design: docs/analysis/ALLOC_TINY_FAST_DUALHOT_1_DESIGN.md

Status: Research box (default OFF), needs root cause analysis

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-13 04:28:52 +09:00
Moe Charm (CI)
2b567ac070 Phase FREE-TINY-FAST-DUALHOT-1: Optimize C0-C3 direct free path 
Treat C0-C3 classes (48% of calls) as "second hot path" instead of
cold path. Skip expensive policy snapshot and route determination,
direct to tiny_legacy_fallback_free_base().

Measurements from FREE-TINY-FAST-HOTCOLD-OPT-1 revealed C0-C3 is NOT
rare (48.43% of all frees). Previous attempt to optimize via hot/cold
split failed (-13% regression) because noinline + function call on 48%
of workload hurt more than it helped.

This phase applies correct optimization: direct inline path for
frequent C0-C3 without policy snapshot overhead.

Implementation:
- Insert C0-C3 early-exit after C7 ULTRA check
- Skip tiny_front_v3_snapshot_get() for C0-C3 (saves 5-10 cycles)
- Skip route determination logic
- Safety: HAKMEM_TINY_LARSON_FIX=1 disables optimization

Benchmark Results (100M ops, 400 threads, MIXED_TINYV3_C7_SAFE):
- Baseline (optimization OFF): 44.50M ops/s (median)
- Optimized (DUALHOT ON):      48.74M ops/s (median)
- Improvement: +9.51% (+4.23M ops/s)

Perf Stats (optimized):
- Branch misses: 112.8M
- Cycles: 8.89B
- Instructions: 21.95B (2.47 IPC)
- Cache misses: 656K

Status: GO (significant improvement, no regression)

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-13 03:46:36 +09:00
Moe Charm (CI)
c503b212a3 Phase FREE-TINY-FAST-HOTCOLD-OPT-1: Hot/Cold split for free_tiny_fast [RESEARCH BOX - FREEZE] 
Split free_tiny_fast() into hot and cold paths to reduce I-cache pressure:
- free_tiny_fast_hot(): always_inline, fast-path validation + ULTRA/MID/V7
- free_tiny_fast_cold(): noinline,cold, cross-thread + TinyHeap + legacy

ENV: HAKMEM_FREE_TINY_FAST_HOTCOLD=0/1 (default 0)
Stats: HAKMEM_FREE_TINY_FAST_HOTCOLD_STATS=0/1 (TLS only, exit dump)

## Benchmark Results (random mixed, 100M ops)

HOTCOLD=0 (legacy): 49.35M, 50.18M, 50.25M ops/s (median: 50.18M)
HOTCOLD=1 (split):  43.54M, 43.59M, 43.62M ops/s (median: 43.59M)

**Regression: -13.1%** (NO-GO)

## Stats Analysis (10M ops, HOTCOLD_STATS=1)

Hot path:  50.11% (C7 ULTRA early-exit)
Cold path: 48.43% (legacy fallback)

## Root Cause

Design assumption FAILED: "Cold path is rare"
Reality: Cold path is 48% (almost as common as hot path)

The split introduces:
1. Extra dispatch overhead in hot path
2. Function call overhead to cold for ~48% of frees
3. "Cold" is NOT rare - it's the legacy fallback for non-ULTRA classes

## Conclusion

**FREEZE as research box (default OFF)**

Box Theory value:
- Validated hot/cold distribution via TLS stats
- Confirmed that legacy fallback is NOT rare (48%)
- Demonstrated that naive hot/cold split hurts when "cold" is common

Alternative approaches for future work:
1. Inline the legacy fallback in hot path (no split)
2. Route-specific specialization (C7 vs non-C7 separate paths)
3. Policy-based early routing (before header validation)

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-13 03:16:54 +09:00
Moe Charm (CI)
e95e61f0ff Phase POLICY-FAST-PATH-V2 complete + MID-V35-HOTPATH-OPT-1 design 
## Phase POLICY-FAST-PATH-V2 (FROZEN)
- Implementation complete: free_policy_fast_v2_box.h + malloc_tiny_fast.h integration
- A/B Results:
  - Mixed (ws=400): -1.6% regression ❌ (branch cost > skip benefit)
  - C6-heavy (ws=200): +5.4% improvement ✅
- Decision: Default OFF, FROZEN (ws<300 / C6-heavy research only)
- Learning: Large WS causes branch misprediction to dominate

## Phase 3-GRADUATE + ENV probe fix
- 64-probe retry for getenv() stability during bench_profile putenv()
- C6 ULTRA intrusive freelist: FROZEN (research box)

## Phase MID-V35-HOTPATH-OPT-1-DESIGN
- Design doc for next optimization target
- Target: MID v3.5 alloc/free hot path (C5-C6)
- Boxes: Stats Gate, TLS Layout, Boundary Check elimination
- Expected: +3-9% on Mixed mainline

Files:
- core/box/free_policy_fast_v2_box.h (new)
- core/box/free_path_stats_box.h/c (policy_fast_v2_skip counter)
- core/front/malloc_tiny_fast.h (fast-path integration)
- docs/analysis/MID_V35_HOTPATH_OPT_1_DESIGN.md (new)
- docs/analysis/PHASE_3_GRADUATE_*.md (new)
- CURRENT_TASK.md (phase status update)

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-12 18:40:08 +09:00
Moe Charm (CI)
1a8652a91a Phase TLS-UNIFY-3: C6 intrusive freelist implementation (完成) 
Implement C6 ULTRA intrusive LIFO freelist with ENV gating:
- Single-linked LIFO using next pointer at USER+1 offset
- tiny_next_store/tiny_next_load for pointer access (single source of truth)
- Segment learning via ss_fast_lookup (per-class seg_base/seg_end)
- ENV gate: HAKMEM_TINY_C6_ULTRA_INTRUSIVE_FL (default OFF)
- Counters: c6_ifl_push/pop/fallback in FREE_PATH_STATS

Files:
- core/box/tiny_ultra_tls_box.h: Added c6_head field for intrusive LIFO
- core/box/tiny_ultra_tls_box.c: Pop/push with intrusive branching (case 6)
- core/box/tiny_c6_ultra_intrusive_env_box.h: ENV gate (new)
- core/box/tiny_c6_intrusive_freelist_box.h: L1 pure LIFO (new)
- core/tiny_debug_ring.h: C6_IFL events
- core/box/free_path_stats_box.h/c: c6_ifl_* counters

A/B Test Results (1M iterations, ws=200, 257-512B):
- ENV_OFF (array): 56.6 Mop/s avg
- ENV_ON (intrusive): 57.6 Mop/s avg (+1.8%, within noise)
- Counters verified: c6_ifl_push=265890, c6_ifl_pop=265815, fallback=0

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-12 16:26:42 +09:00
Moe Charm (CI)
212739607a Phase v11a-3: MID v3.5 Activation (Build Complete) 
Integrated MID v3.5 into active code path, making it available for C5/C6/C7 routing.

Key Changes:
- Policy Box: Added SMALL_ROUTE_MID_V35 with ENV gates (HAKMEM_MID_V35_ENABLED, HAKMEM_MID_V35_CLASSES)
- HotBox: Implemented small_mid_v35_alloc/free with TLS-cached page allocation
- Front Gate: Wired MID_V35 routing into malloc_tiny_fast.h (priority: ULTRA > MID_V35 > V7)
- Build: Added core/smallobject_mid_v35.o to all object lists

Architecture:
- Slot sizes: C5=384B, C6=512B, C7=1024B
- Page size: 64KB (170/128/64 slots)
- Integration: ColdIface v2 (refill/retire), Stats v2 (observation), Learner v2 (dormant)

Status: Build successful, ready for A/B benchmarking
Next: Performance validation (C6-heavy, C5+C6-only, Mixed benchmarks)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 06:52:14 +09:00
Moe Charm (CI)
79674c9390 Phase v10: Remove legacy v3/v4/v5 implementations 
Removal strategy: Deprecate routes by disabling ENV-based routing
- v3/v4/v5 enum types kept for binary compatibility
- small_heap_v3/v4/v5_enabled() always return 0
- small_heap_v3/v4/v5_class_enabled() always return 0
- Any v3/v4/v5 ENVs are silently ignored, routes to LEGACY

Changes:
- core/box/smallobject_hotbox_v3_env_box.h: stub functions
- core/box/smallobject_hotbox_v4_env_box.h: stub functions
- core/box/smallobject_v5_env_box.h: stub functions
- core/front/malloc_tiny_fast.h: remove alloc/free cases (20+ lines)

Benefits:
- Cleaner routing logic (v6/v7 only for SmallObject)
- 20+ lines deleted from hot path validation
- No behavioral change (routes were rarely used)

Performance: No regression expected (v3/v4/v5 already disabled by default)

Next: Set Learner v7 default ON, production testing

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 06:09:12 +09:00
Moe Charm (CI)
6c8c7b7f6c v7-5b/v7-7: Fix free path for C5 and Learner route switching 
Bug fixes:
- Free path now handles C5 (not just C6) for v7 routing
- After Learner route switch, old V7 pointers are correctly freed
  via V7 (instead of being misrouted to legacy)

Change: Always try V7 free for SMALL_V7_CLASS_SUPPORTED classes
(C5/C6). V7 returns false if ptr is not in V7 segment, allowing
proper fallback to legacy for non-V7 pointers.

This fix is essential because Learner may dynamically switch
C5 from V7→MID_V3, but pointers allocated before the switch
still reside in V7 segments and must be freed via V7.

Performance (C5/C6 workload 200-500B):
- v7 OFF: ~19M ops/s
- v7+Learner: ~43M ops/s (+126%)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 06:02:13 +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)
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)
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)
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)
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)
fb88725a43 Phase FREE-LEGACY-OPT-6: C4 ULTRA Implementation 
Implement C4 ULTRA free TLS cache with parasitic free+alloc pattern,
achieving 99.7-99.9% elimination of C4 legacy fallback calls.

Key Features:
- TLS cache cap=64 (tuned for L1 cache fit, smaller than C5/C6's 128)
- Segment learning via ss_fast_lookup() on first free
- Free-side cache push + alloc-side TLS pop pattern
- ENV gate: HAKMEM_TINY_C4_ULTRA_FREE_ENABLED (default OFF)
- Full FREE_PATH_STATS instrumentation

Benchmark Results:
C4-heavy (65-128B range):
  - C4 legacy: 591,583 → 1,711 (-99.7%)
  - c4_ultra cache hits: ~599k (free) + ~599k (alloc)
  - Mixed load: 340,732 → 284 C4 legacy (-99.9%)

Legacy fallback reduction:
  - C4-heavy: 589,872 fewer legacy calls (-10.9% total)
  - Mixed: 340,448 fewer C4 legacy calls (-12.8% in mixed)

Performance note: ~2% throughput cost in isolated C4-heavy case,
acceptable tradeoff for 99%+ legacy elimination per class.

Files:
  NEW: core/box/tiny_c4_ultra_free_box.h/c
  NEW: core/box/tiny_c4_ultra_free_env_box.h
  MOD: core/box/tiny_ultra_classes_box.h (added C4 macros)
  MOD: core/box/free_path_stats_box.h/c (C4 ULTRA counters)
  MOD: core/front/malloc_tiny_fast.h (C4 alloc+free integration)
  MOD: Makefile (added C4 ULTRA object)

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 19:38:27 +09:00
Moe Charm (CI)
ea6ed1a6e4 Phase FREE-LEGACY-OPT-5-1/5-2: C5 ULTRA free+alloc integration 
Summary:
========
Implemented C5 ULTRA TLS cache pattern following the successful C6 ULTRA design:
- Phase 5-1: Free-side TLS cache + segment learning
- Phase 5-2: Alloc-side TLS pop for complete free+alloc cycle integration

Targets C5 class (129-256B) as next legacy reduction after C6 completion.

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

1. NEW FILES:
   - core/box/tiny_c5_ultra_free_box.h: C5 ULTRA TLS cache structure
   - core/box/tiny_c5_ultra_free_box.c: C5 free path implementation (same pattern as C6)
   - core/box/tiny_c5_ultra_free_env_box.h: ENV gating (HAKMEM_TINY_C5_ULTRA_FREE_ENABLED)

2. MODIFIED FILES:
   - core/front/malloc_tiny_fast.h:
     * Added C5 ULTRA includes
     * Added C5 alloc-side TLS pop at lines 186-194 (integrated with C6)
     * Added C5 free path at lines 333-337 (integrated with C6)

   - core/box/tiny_ultra_classes_box.h:
     * Added TINY_CLASS_C5 constant
     * Added tiny_class_is_c5() macro
     * Extended tiny_class_is_ultra() to include C5

   - core/box/free_path_stats_box.h:
     * Added c5_ultra_free_fast counter
     * Added c5_ultra_alloc_hit counter

   - core/box/free_path_stats_box.c:
     * Updated stats dump to output C5 counters

   - Makefile:
     * Added core/box/tiny_c5_ultra_free_box.o to all object lists

3. Design Rationale:
   - Exact copy of C6 ULTRA pattern (proven effective)
   - TLS cache capacity: 128 blocks (same as C6 for consistency)
   - Segment learning on first C5 free via ss_fast_lookup()
   - Alloc-side pop integrated directly in malloc_tiny_fast.h hotpath
   - Legacy fallback unification via tiny_legacy_fallback_free_base()

4. Expected Impact:
   - C5 legacy calls: 68,871 → 0 (100% elimination)
   - Total legacy reduction: ~53% of remaining 129,623
   - Mixed workload: Minimal regression (C5 is smaller class, fewer allocations)

5. Stats Collection:
   Run with: HAKMEM_TINY_C5_ULTRA_FREE_ENABLED=1 HAKMEM_FREE_PATH_STATS=1 ./bench_allocators_hakmem

   Expected output:
   [FREE_PATH_STATS] ... c5_ultra_free=68871 c5_ultra_alloc=68871 ... legacy_fb=60752 ...
   [FREE_PATH_STATS_LEGACY_BY_CLASS] ... c5=0 ...

Status:
=======
- Code: ✅ COMPLETE (3 new files + 5 modified files)
- Compilation: ✅ Verified (no errors, only unused variable warnings unrelated to C5)
- Functionality: Ready to benchmark (ENV gating: default OFF, opt-in via ENV)

Phase Progression:
==================
✅ Phase 4-4: C6 ULTRA free+alloc (legacy C6: 137,319 → 0)
✅ Phase 5-1/5-2: C5 ULTRA free+alloc (legacy C5: 68,871 → 0 expected)
⏳ Phase 4.5: C4 ULTRA (34,727 remaining)
📋 Future: C3/C2 ULTRA if beneficial

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 19:26:51 +09:00
Moe Charm (CI)
c848a60696 Phase REFACTOR-3: Inline Pointer Macro Centralization (tiny_base_to_user_inline) 
Centralize BASE ↔ USER pointer conversions into reusable, zero-cost macros.
Previously, pointer arithmetic (base + 1, ptr - 1) was scattered across
allocation/deallocation code with hardcoded offsets.

Changes:
- NEW: core/box/tiny_ptr_convert_box.h
  - tiny_base_to_user_inline(): BASE → USER (base + TINY_HEADER_OFFSET)
  - tiny_user_to_base_inline(): USER → BASE (user - TINY_HEADER_OFFSET)
  - TINY_HEADER_OFFSET: Centralized constant (currently 1)
  - Function variants: tiny_base_to_user(), tiny_user_to_base()

- Modified: core/front/malloc_tiny_fast.h
  - L181: return (uint8_t*)base + 1 → tiny_base_to_user_inline(base)
  - L299: void* base = (void*)((char*)ptr - 1) → tiny_user_to_base_inline(ptr)

Benefits:
- Self-documenting code (semantic intent is clear)
- Single source of truth for header offset
- Easier to extend (e.g., variable-length headers, alignment changes)
- Type-safe conversions (macro validates pointer types)
- Zero performance cost (inline macro, same compiled code)

Contract:
- Header stored at offset -1 from USER pointer
- Allocation: base → user (user = base + 1)
- Deallocation: user → base (base = user - 1)

No semantic changes - identical logic, just centralized.

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 19:02:49 +09:00
Moe Charm (CI)
0752688785 Phase REFACTOR-2: Legacy Fallback Logic Unification 
Consolidate duplicated legacy free logic into a single reusable function.
Previously, hak_tiny_free_legacy_inline() and hak_tiny_free_legacy_impl()
contained identical implementations in malloc_tiny_fast.h and
tiny_c6_ultra_free_box.c.

Changes:
- NEW: core/box/tiny_legacy_fallback_box.h
  - tiny_legacy_fallback_free_base(): Unified legacy free implementation
  - Encapsulates: Unified Cache push + per-class stats + final fallback
  - Contract: BASE pointer input (already extracted from USER ptr)

- Modified: core/front/malloc_tiny_fast.h
  - Removed: hak_tiny_free_legacy_inline() (lines 96-111)
  - Replaced call: hak_tiny_free_legacy_inline → tiny_legacy_fallback_free_base

- Modified: core/box/tiny_c6_ultra_free_box.c
  - Removed: hak_tiny_free_legacy_impl() (lines 17-39)
  - Replaced call: hak_tiny_free_legacy_impl → tiny_legacy_fallback_free_base

Benefits:
- Single source of truth (DRY principle)
- Easier to maintain and test
- Consistent behavior across all free paths
- No performance impact (always_inline preserved)

No semantic changes - identical logic, just centralized.

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 19:01:59 +09:00
Moe Charm (CI)
3cf88dab84 Phase REFACTOR-1: Magic Number → Named Constants (TINY_CLASS_C6/C7) 
Replace hardcoded class_idx checks (== 6, == 7) with named macros:
- tiny_class_is_c6(idx) for C6 checks
- tiny_class_is_c7(idx) for C7 checks
- tiny_class_is_ultra(idx) for combined checks

Benefits:
- Self-documenting code (semantic intent is clear)
- Single source of truth for class constants
- Easier to extend to other ULTRA tiers (C5, C8) in future

Changes:
- NEW: core/box/tiny_ultra_classes_box.h (named constants + helpers)
- Modified: core/front/malloc_tiny_fast.h (4 replacements: L181, L193, L326, L337)

No performance impact (zero-cost macros, same compiled code).

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 19:00:45 +09:00
Moe Charm (CI)
9830eff6cc Phase FREE-LEGACY-OPT-4-4: C6 ULTRA free+alloc integration 
Parasitic TLS cache: alloc now pops from the TLS freelist filled by free.

Implementation:
- malloc_tiny_fast(): C6 class-specific TLS pop check before route switch
  - if (class_idx == 6 && tiny_c6_ultra_free_enabled())
  - pop from TinyC6UltraFreeTLS.freelist[--count]
  - return USER pointer (BASE + 1)

- FreePathStats: Added c6_ultra_alloc_hit counter for observability

Results (Mixed 16-1024B):
- OFF: 40.2M ops/s baseline
- ON:  42.2M ops/s (+4.9%) stable

Per-profile:
- Mixed:     +4.9% (40.2M → 42.2M)
- C6-heavy:  +7.6% (40.7M → 43.8M)

Free-alloc loop:
- free: TLS push (all C6 frees)
- alloc: TLS pop (all C6 allocs in steady state)
- Cache never fills, no legacy overflow
- C6 legacy_by_class reduced from 137K to 0 (100% elimination)

Key insight:
- Free-only TLS cache fails without alloc integration
- Once integrated, creates perfect load-balancing loop
- Alloc drains exactly what free fills

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-11 18:47:21 +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)

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

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

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-11 18:04:14 +09:00
Moe Charm (CI)
e2ca52d59d Phase v6-6: Inline hot path optimization for SmallObject Core v6 
Optimize v6 alloc/free by eliminating redundant route checks and adding
inline hot path functions:

- smallobject_core_v6_box.h: Add inline hot path functions:
  - small_alloc_c6_hot_v6() / small_alloc_c5_hot_v6(): Direct TLS pop
  - small_free_c6_hot_v6() / small_free_c5_hot_v6(): Direct TLS push
  - No route check needed (caller already validated via switch case)

- smallobject_core_v6.c: Add cold path functions:
  - small_alloc_cold_v6(): Handle TLS refill from page
  - small_free_cold_v6(): Handle page freelist push (TLS full/cross-thread)

- malloc_tiny_fast.h: Update front gate to use inline hot path:
  - Alloc: hot path first, cold path fallback on TLS miss
  - Free: hot path first, cold path fallback on TLS full

Performance results:
- C5-heavy: v6 ON 42.2M ≈ baseline (parity restored)
- C6-heavy: v6 ON 34.5M ≈ baseline (parity restored)
- Mixed 16-1024B: ~26.5M (v3-only: ~28.1M, gap is routing overhead)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-11 15:59:29 +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 ✅

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 15:29:59 +09:00
Moe Charm (CI)
e0fb7d550a Phase v5-2: SmallObject v5 C6-only 本実装 (WIP - header fix) 
本実装修正:
- tiny_region_id_write_header() を追加: USER pointer を正しく返す
- TLS slot からの segment 探索 (page_meta_of)
- Page-level allocation で segment 再利用
- 2MiB alignment 保証 (4MiB 確保 + alignment)
- free パスの route 修正 (v4 から v5 への fallthrough 削除)

動作確認:
- SEGV 消失: alloc/free 基本動作 OK
- 性能: ~18-20M ops/s (baseline 43-47M の約 40-45%)
- 回帰原因: TLS slot 線形探索 O(n)、find_page O(n)

残タスク:
- O(1) segment lookup 最適化 (hash または array 直接参照)
- find_page 除去 (segment lookup 成功時)
- partial_count/list 管理の最適化

ENV デフォルト OFF なので本線影響なし。

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-11 04:14:51 +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）

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 03:25:37 +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

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-10 22:57:26 +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)
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%** |

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

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)
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)
a6991ec9e4 Add TinyHeap class mask and extend routing 2025-12-07 22:49:28 +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)
c1c45106da Two-Speed HOT PATH: Guard hak_super_lookup calls with HAKMEM_BUILD_RELEASE 
Phase E2 introduced registry lookup to the hot path, causing 84-88% regression
(70M → 9M ops/sec). This commit restores performance by guarding expensive
hak_super_lookup calls (50-100 cycles each) with conditional compilation.

Key changes:
- tls_sll_box.h push: Full validation in Debug, ss_fast_lookup (O(1)) in Release
- tls_sll_box.h pop: Registry validation in Debug, trust list structure in Release
- tiny_free_fast_v2.inc.h: Header/meta cross-check Debug-only
- malloc_tiny_fast.h: SuperSlab registration check Debug-only

Performance improvement:
- Release build: 2.9M → 87-88M ops/sec (30x improvement)
- Restored to historical UNIFIED-HEADER peak (70-80M range)

Release builds trust:
- Header magic (0xA0) as sufficient allocation origin validation
- TLS SLL linked list structure integrity
- Header-based class_idx classification

Debug builds maintain full validation with expensive registry lookups.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-04 18:53:04 +09:00
Moe Charm (CI)
0c0d9c8c0b Unify Unified Cache API to BASE-only pointer type with Phantom typing 
Core Changes:
- Modified: core/front/tiny_unified_cache.h
  * API signatures changed to use hak_base_ptr_t (Phantom type)
  * unified_cache_pop() returns hak_base_ptr_t (was void*)
  * unified_cache_push() accepts hak_base_ptr_t base (was void*)
  * unified_cache_pop_or_refill() returns hak_base_ptr_t (was void*)
  * Added #include "../box/ptr_type_box.h" for Phantom types

- Modified: core/front/tiny_unified_cache.c
  * unified_cache_refill() return type changed to hak_base_ptr_t
  * Uses HAK_BASE_FROM_RAW() for wrapping return values
  * Uses HAK_BASE_TO_RAW() for unwrapping parameters
  * Maintains internal void* storage in slots array

- Modified: core/box/tiny_front_cold_box.h
  * Uses hak_base_ptr_t from unified_cache_refill()
  * Uses hak_base_is_null() for NULL checks
  * Maintains tiny_user_offset() for BASE→USER conversion
  * Cold path refill integration updated to Phantom types

- Modified: core/front/malloc_tiny_fast.h
  * Free path wraps BASE pointer with HAK_BASE_FROM_RAW()
  * When pushing to Unified Cache via unified_cache_push()

Design Rationale:
- Unified Cache API now exclusively handles BASE pointers (no USER mixing)
- Phantom types enforce type distinction at compile time (debug mode)
- Zero runtime overhead in Release mode (macros expand to identity)
- Hot paths (tiny_hot_alloc_fast, tiny_hot_free_fast) remain unchanged
- Layout consistency maintained via tiny_user_offset() Box

Validation:
- All 25 Phantom type usage sites verified (25/25 correct)
- HAK_BASE_FROM_RAW(): 5/5 correct wrappings
- HAK_BASE_TO_RAW(): 1/1 correct unwrapping
- hak_base_is_null(): 4/4 correct NULL checks
- Compilation: RELEASE=0 and RELEASE=1 both successful
- Smoke tests: 3/3 passed (simple_alloc, loop 10M, pool_tls)

Type Safety Benefits:
- Prevents USER/BASE pointer confusion at API boundaries
- Compile-time checking in debug builds via Phantom struct
- Zero cost abstraction in release builds
- Clear intent: Unified Cache exclusively stores BASE pointers

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-04 12:20:21 +09:00
Moe Charm (CI)
c2716f5c01 Implement Phase 2: Headerless Allocator Support (Partial) 
- Feature: Added HAKMEM_TINY_HEADERLESS toggle (A/B testing)
- Feature: Implemented Headerless layout logic (Offset=0)
- Refactor: Centralized layout definitions in tiny_layout_box.h
- Refactor: Abstracted pointer arithmetic in free path via ptr_conversion_box.h
- Verification: sh8bench passes in Headerless mode (No TLS_SLL_HDR_RESET)
- Known Issue: Regression in Phase 1 mode due to blind pointer conversion logic
 2025-12-03 12:11:27 +09:00
Moe Charm (CI)
195c74756c Fix mid free routing and relax mid W_MAX 2025-12-01 22:06:10 +09:00
Moe Charm (CI)
04186341c1 Phase 4-Step2: Add Hot/Cold Path Box (+7.3% performance) 
Implemented Hot/Cold Path separation using Box pattern for Tiny allocations:

Performance Improvement (without PGO):
- Baseline (Phase 26-A):     53.3 M ops/s
- Hot/Cold Box (Phase 4-Step2): 57.2 M ops/s
- Gain: +7.3% (+3.9 M ops/s)

Implementation:
1. core/box/tiny_front_hot_box.h - Ultra-fast hot path (1 branch)
   - Removed range check (caller guarantees valid class_idx)
   - Inline cache hit path with branch prediction hints
   - Debug metrics with zero overhead in Release builds

2. core/box/tiny_front_cold_box.h - Slow cold path (noinline, cold)
   - Refill logic (batch allocation from SuperSlab)
   - Drain logic (batch free to SuperSlab)
   - Error reporting and diagnostics

3. core/front/malloc_tiny_fast.h - Updated to use Hot/Cold Boxes
   - Hot path: tiny_hot_alloc_fast() (1 branch: cache empty check)
   - Cold path: tiny_cold_refill_and_alloc() (noinline, cold attribute)
   - Clear separation improves i-cache locality

Branch Analysis:
- Baseline: 4-5 branches in hot path (range check + cache check + refill logic mixed)
- Hot/Cold Box: 1 branch in hot path (cache empty check only)
- Reduction: 3-4 branches eliminated from hot path

Design Principles (Box Pattern):
✅ Single Responsibility: Hot path = cache hit only, Cold path = refill/errors
✅ Clear Contract: Hot returns NULL on miss, Cold handles miss
✅ Observable: Debug metrics (TINY_HOT_METRICS_*) gated by NDEBUG
✅ Safe: Branch prediction hints (TINY_HOT_LIKELY/UNLIKELY)
✅ Testable: Isolated hot/cold paths, easy A/B testing

PGO Status:
- Temporarily disabled (build issues with __gcov_merge_time_profile)
- Will re-enable PGO in future commit after resolving gcc/lto issues
- Current benchmarks are without PGO (fair A/B comparison)

Other Changes:
- .gitignore: Added *.d files (dependency files, auto-generated)
- Makefile: PGO targets temporarily disabled (show informational message)
- build_pgo.sh: Temporarily disabled (show "PGO paused" message)

Next: Phase 4-Step3 (Front Config Box, target +5-8%)

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-29 11:58:37 +09:00
Moe Charm (CI)
64ed3d8d8c Add ss_fast_lookup() for O(1) SuperSlab lookup via mask 
Replaces expensive hak_super_lookup() (registry hash lookup, 50-100 cycles)
with fast mask-based lookup (~5-10 cycles) in free hot paths.

Algorithm:
1. Mask pointer with SUPERSLAB_SIZE_MIN (1MB) - works for both 1MB and 2MB SS
2. Validate magic (SUPERSLAB_MAGIC)
3. Range check using ss->lg_size

Applied to:
- tiny_free_fast.inc.h: tiny_free_fast() SuperSlab path
- tiny_free_fast_v2.inc.h: LARSON_FIX cross-thread check
- front/malloc_tiny_fast.h: free_tiny_fast() LARSON_FIX path

Note: Performance impact minimal with LARSON_FIX=OFF (default) since
SuperSlab lookup is skipped entirely in that case. Optimization benefits
LARSON_FIX=ON path for safe multi-threaded operation.

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-27 12:47:10 +09:00
Moe Charm (CI)
d8e3971dc2 Fix cross-thread ownership check: Use bits 8-15 for owner_tid_low 
Problem:
- TLS_SLL_PUSH_DUP crash in Larson multi-threaded benchmark
- Cross-thread frees incorrectly routed to same-thread TLS path
- Root cause: pthread_t on glibc is 256-byte aligned (TCB base)
  so lower 8 bits are ALWAYS 0x00 for ALL threads

Fix:
- Change owner_tid_low from (tid & 0xFF) to ((tid >> 8) & 0xFF)
- Bits 8-15 actually vary between threads, enabling correct detection
- Applied consistently across all ownership check locations:
  - superslab_inline.h: ss_owner_try_acquire/release/is_mine
  - slab_handle.h: slab_try_acquire
  - tiny_free_fast.inc.h: tiny_free_is_same_thread_ss
  - tiny_free_fast_v2.inc.h: cross-thread detection
  - tiny_superslab_free.inc.h: same-thread check
  - ss_allocation_box.c: slab initialization
  - hakmem_tiny_superslab.c: ownership handling

Also added:
- Address watcher debug infrastructure (tiny_region_id.h)
- Cross-thread detection in malloc_tiny_fast.h Front Gate

Test results:
- Larson 1T/2T/4T: PASS (no TLS_SLL_PUSH_DUP crash)
- random_mixed: PASS
- Performance: ~20M ops/s (regression from 48M, needs optimization)

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-27 11:52:11 +09:00
Moe Charm (CI)
5c9fe34b40 Enable performance optimizations by default (+557% improvement) 
## Performance Impact

**Before** (optimizations OFF):
- Random Mixed 256B: 9.4M ops/s
- System malloc ratio: 10.6% (9.5x slower)

**After** (optimizations ON):
- Random Mixed 256B: 61.8M ops/s (+557%)
- System malloc ratio: 70.0% (1.43x slower) ✅
- 3-run average: 60.1M - 62.8M ops/s (±2.2% variance)

## Changes

Enabled 3 critical optimizations by default:

### 1. HAKMEM_SS_EMPTY_REUSE (hakmem_shared_pool.c:810)
```c
// BEFORE: default OFF
empty_reuse_enabled = (e && *e && *e != '0') ? 1 : 0;

// AFTER: default ON
empty_reuse_enabled = (e && *e && *e == '0') ? 0 : 1;
```
**Impact**: Reuse empty slabs before mmap, reduces syscall overhead

### 2. HAKMEM_TINY_UNIFIED_CACHE (tiny_unified_cache.h:69)
```c
// BEFORE: default OFF
g_enable = (e && *e && *e != '0') ? 1 : 0;

// AFTER: default ON
g_enable = (e && *e && *e == '0') ? 0 : 1;
```
**Impact**: Unified TLS cache improves hit rate

### 3. HAKMEM_FRONT_GATE_UNIFIED (malloc_tiny_fast.h:42)
```c
// BEFORE: default OFF
g_enable = (e && *e && *e != '0') ? 1 : 0;

// AFTER: default ON
g_enable = (e && *e && *e == '0') ? 0 : 1;
```
**Impact**: Unified front gate reduces dispatch overhead

## ENV Override

Users can still disable optimizations if needed:
```bash
export HAKMEM_SS_EMPTY_REUSE=0           # Disable empty slab reuse
export HAKMEM_TINY_UNIFIED_CACHE=0       # Disable unified cache
export HAKMEM_FRONT_GATE_UNIFIED=0       # Disable unified front gate
```

## Comparison to Competitors

```
mimalloc:      113.34M ops/s (1.83x faster than HAKMEM)
System malloc:  88.20M ops/s (1.43x faster than HAKMEM)
HAKMEM:         61.80M ops/s ✅ Competitive performance
```

## Files Modified
- core/hakmem_shared_pool.c - EMPTY_REUSE default ON
- core/front/tiny_unified_cache.h - UNIFIED_CACHE default ON
- core/front/malloc_tiny_fast.h - FRONT_GATE_UNIFIED default ON

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-22 01:29:05 +09:00
Moe Charm (CI)
5b36c1c908 Phase 26: Front Gate Unification - Tiny allocator fast path (+12.9%) 
Implementation:
- New single-layer malloc/free path for Tiny (≤1024B) allocations
- Bypasses 3-layer overhead: malloc → hak_alloc_at (236 lines) → wrapper → tiny_alloc_fast
- Leverages Phase 23 Unified Cache (tcache-style, 2-3 cache misses)
- Safe fallback to normal path on Unified Cache miss

Performance (Random Mixed 256B, 100K iterations):
- Baseline (Phase 26 OFF): 11.33M ops/s
- Phase 26 ON: 12.79M ops/s (+12.9%)
- Prediction (ChatGPT): +10-15% → Actual: +12.9% (perfect match!)

Bug fixes:
- Initialization bug: Added hak_init() call before fast path
- Page boundary SEGV: Added guard for offset_in_page == 0

Also includes Phase 23 debug log fixes:
- Guard C2_CARVE logs with #if !HAKMEM_BUILD_RELEASE
- Guard prewarm logs with #if !HAKMEM_BUILD_RELEASE
- Set Hot_2048 as default capacity (C2/C3=2048, others=64)

Files:
- core/front/malloc_tiny_fast.h: Phase 26 implementation (145 lines)
- core/box/hak_wrappers.inc.h: Fast path integration (+28 lines)
- core/front/tiny_unified_cache.h: Hot_2048 default
- core/tiny_refill_opt.h: C2_CARVE log guard
- core/box/ss_hot_prewarm_box.c: Prewarm log guard
- CURRENT_TASK.md: Phase 26 completion documentation

ENV variables:
- HAKMEM_FRONT_GATE_UNIFIED=1 (enable Phase 26, default: OFF)
- HAKMEM_TINY_UNIFIED_CACHE=1 (Phase 23, required)

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

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-17 05:29:08 +09:00