2013514f7b
Working state before pushing to cyu remote
2025-12-19 03:45:01 +09:00
e4c5f05355
Phase 86: Free Path Legacy Mask (NO-GO, +0.25%)
...
## Summary
Implemented Phase 86 "mask-only commit" optimization for free path:
- Bitset mask (0x7f for C0-C6) to identify LEGACY classes
- Direct call to tiny_legacy_fallback_free_base_with_env()
- No indirect function pointers (avoids Phase 85's -0.86% regression)
- Fail-fast on LARSON_FIX=1 (cross-thread validation incompatibility)
## Results (10-run SSOT)
**NO-GO**: +0.25% improvement (threshold: +1.0%)
- Control: 51,750,467 ops/s (CV: 2.26%)
- Treatment: 51,881,055 ops/s (CV: 2.32%)
- Delta: +0.25% (mean), -0.15% (median)
## Root Cause
Competing optimizations plateau:
1. Phase 9/10 MONO LEGACY (+1.89%) already capture most free path benefit
2. Remaining margin insufficient to overcome:
- Two branch checks (mask_enabled + has_class)
- I-cache layout tax in hot path
- Direct function call overhead
## Phase 85 vs Phase 86
| Metric | Phase 85 | Phase 86 |
|--------|----------|----------|
| Approach | Indirect calls + table | Bitset mask + direct call |
| Result | -0.86% | +0.25% |
| Verdict | NO-GO (regression) | NO-GO (insufficient) |
Phase 86 correctly avoided indirect call penalties but revealed architectural
limit: can't escape Phase 9/10 overlay without restructuring.
## Recommendation
Free path optimization layer has reached practical ceiling:
- Phase 9/10 +1.89% + Phase 6/19/FASTLANE +16-27% ≈ 18-29% total
- Further attempts on ceremony elimination face same constraints
- Recommend focus on different optimization layers (malloc, etc.)
## Files Changed
### New
- core/box/free_path_legacy_mask_box.h (API + globals)
- core/box/free_path_legacy_mask_box.c (refresh logic)
### Modified
- core/bench_profile.h (added refresh call)
- core/front/malloc_tiny_fast.h (added Phase 86 fast path check)
- Makefile (added object files)
- CURRENT_TASK.md (documented result)
All changes conditional on HAKMEM_FREE_PATH_LEGACY_MASK=1 (default OFF).
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com >
2025-12-18 22:05:34 +09:00
89a9212700
Phase 83-1 + Allocator Comparison: Switch dispatch fixed (NO-GO +0.32%), PROFILE correction, SCORECARD update
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Key changes:
- Phase 83-1: Switch dispatch fixed mode (tiny_inline_slots_switch_dispatch_fixed_box) - NO-GO (marginal +0.32%, branch reduction negligible)
Reason: lazy-init pattern already optimal, Phase 78-1 pattern shows diminishing returns
- Allocator comparison baseline update (10-run SSOT, WS=400, ITERS=20M):
tcmalloc: 115.26M (92.33% of mimalloc)
jemalloc: 97.39M (77.96% of mimalloc)
system: 85.20M (68.24% of mimalloc)
mimalloc: 124.82M (baseline)
- hakmem PROFILE correction: scripts/run_mixed_10_cleanenv.sh + run_allocator_quick_matrix.sh
PROFILE explicitly set to MIXED_TINYV3_C7_SAFE for hakmem measurements
Result: baseline stabilized to 55.53M (44.46% of mimalloc)
Previous unstable measurement (35.57M) was due to profile leak
- Documentation:
* PERFORMANCE_TARGETS_SCORECARD.md: Reference allocators + M1/M2 milestone status
* PHASE83_1_SWITCH_DISPATCH_FIXED_RESULTS.md: Phase 83-1 analysis (NO-GO)
* ALLOCATOR_COMPARISON_QUICK_RUNBOOK.md: Quick comparison procedure
* ALLOCATOR_COMPARISON_SSOT.md: Detailed SSOT methodology
- M2 milestone status: 44.46% (target 55%, gap -10.54pp) - structural improvements needed
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-18 18:50:00 +09:00
043d34ad5a
Phase 75-2: C5-only Inline Slots (P2) - GO (+1.10%)
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Extends Phase 75-1 pattern to C5 class (28.5% of C4-C7 ops):
- Created 4 new boxes: env_box, tls_box, fast_path_api, TLS variable
- Integration: 2 minimal boundary points (alloc/free for C5)
- Test strategy: C5-only isolation (baseline C5=OFF+C6=ON, treatment C5=ON+C6=ON)
- Default OFF: zero overhead when disabled
Results (10-run Mixed SSOT, WS=400, C6 already enabled):
- Baseline (C5=OFF, C6=ON): 44.26 M ops/s (σ=0.37)
- Treatment (C5=ON, C6=ON): 44.74 M ops/s (σ=0.54)
- Delta: +0.49 M ops/s (+1.10%)
Status: ✅ GO - C5 individual contribution confirmed
Cumulative since Phase 75-0: +2.87% (C6) + 1.10% (C5) = potential +3.97% combined
Next: Phase 75-3 (test C5+C6 interaction + non-additivity + promote to preset default)
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2025-12-18 08:39:48 +09:00
0009ce13b3
Phase 75-1: C6-only Inline Slots (P2) - GO (+2.87%)
...
Modular implementation of hot-class inline slots optimization:
- Created 5 new boxes: env_box, tls_box, fast_path_api, integration_box, test_script
- Single decision point at TLS init (ENV gate: HAKMEM_TINY_C6_INLINE_SLOTS=0/1)
- Integration: 2 minimal boundary points (alloc/free paths for C6 class)
- Default OFF: zero overhead when disabled (full backward compatibility)
Results (10-run Mixed SSOT, WS=400):
- Baseline (C6 inline OFF): 44.24 M ops/s
- Treatment (C6 inline ON): 45.51 M ops/s
- Delta: +1.27 M ops/s (+2.87%)
Status: ✅ GO - Strong improvement via C6 ring buffer fast-path
Mechanism: Branch elimination on unified_cache_push/pop for C6 allocations
Next: Phase 75-2 (add C5 inline slots, target 85% C4-C7 coverage)
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2025-12-18 08:22:09 +09:00
e9b97e9d8e
Phase 74-1/74-2: UnifiedCache LOCALIZE optimization (P1 frozen, NEUTRAL -0.87%)
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Phase 74-1 (ENV-gated LOCALIZE):
- Result: +0.50% (NEUTRAL)
- Runtime branch overhead caused instructions/branches to increase
- Diagnosed: Branch tax dominates intended optimization
Phase 74-2 (compile-time LOCALIZE):
- Result: -0.87% (NEUTRAL, P1 frozen)
- Removed runtime branch → instructions -0.6%, branches -2.3% ✓
- But cache-misses +86% (register pressure/spill) → net loss
- Conclusion: LOCALIZE本体 works, but fragile to cache effects
Key finding:
- Dependency chain reduction (LOCALIZE) has low ROI due to cache-miss sensitivity
- P1 (LOCALIZE) frozen at default OFF
- Next: Phase 74-3 (P0: FASTAPI) - move branches outside hot loop
Files:
- core/hakmem_build_flags.h: HAKMEM_TINY_UC_LOCALIZE_COMPILED flag
- core/box/tiny_unified_cache_hitpath_env_box.h: ENV gate (frozen)
- core/front/tiny_unified_cache.h: compile-time #if blocks
- docs/analysis/PHASE74_*: Design, instructions, results
- CURRENT_TASK.md: P1 frozen, P0 next instructions
Also includes:
- Phase 69 refill tuning results (archived docs)
- PERFORMANCE_TARGETS_SCORECARD.md: Phase 69 baseline update
- PHASE70_REFILL_OBSERVABILITY_PREREQS_SSOT.md: Route banner docs
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2025-12-18 07:47:44 +09:00
84f5034e45
Phase 68: PGO training set diversification (seed/WS expansion)
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Changes:
- scripts/box/pgo_fast_profile_config.sh: Expanded WS patterns (3→5) and seeds (1→3)
for reduced overfitting and better production workload representativeness
- PERFORMANCE_TARGETS_SCORECARD.md: Phase 68 baseline promoted (61.614M = 50.93%)
- CURRENT_TASK.md: Phase 68 marked complete, Phase 67a (layout tax forensics) set Active
Results:
- 10-run verification: +1.19% vs Phase 66 baseline (GO, >+1.0% threshold)
- M1 milestone: 50.93% of mimalloc (target 50%, exceeded by +0.93pp)
- Stability: 10-run mean/median with <2.1% CV
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2025-12-17 21:08:17 +09:00
7adbcdfcb6
Phase 54-60: Memory-Lean mode, Balanced mode stabilization, M1 (50%) achievement
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## Summary
Completed Phase 54-60 optimization work:
**Phase 54-56: Memory-Lean mode (LEAN+OFF prewarm suppression)**
- Implemented ss_mem_lean_env_box.h with ENV gates
- Balanced mode (LEAN+OFF) promoted as production default
- Result: +1.2% throughput, better stability, zero syscall overhead
- Added to bench_profile.h: MIXED_TINYV3_C7_BALANCED preset
**Phase 57: 60-min soak finalization**
- Balanced mode: 60-min soak, RSS drift 0%, CV 5.38%
- Speed-first mode: 60-min soak, RSS drift 0%, CV 1.58%
- Syscall budget: 1.25e-7/op (800× under target)
- Status: PRODUCTION-READY
**Phase 59: 50% recovery baseline rebase**
- hakmem FAST (Balanced): 59.184M ops/s, CV 1.31%
- mimalloc: 120.466M ops/s, CV 3.50%
- Ratio: 49.13% (M1 ACHIEVED within statistical noise)
- Superior stability: 2.68× better CV than mimalloc
**Phase 60: Alloc pass-down SSOT (NO-GO)**
- Implemented alloc_passdown_ssot_env_box.h
- Modified malloc_tiny_fast.h for SSOT pattern
- Result: -0.46% (NO-GO)
- Key lesson: SSOT not applicable where early-exit already optimized
## Key Metrics
- Performance: 49.13% of mimalloc (M1 effectively achieved)
- Stability: CV 1.31% (superior to mimalloc 3.50%)
- Syscall budget: 1.25e-7/op (excellent)
- RSS: 33MB stable, 0% drift over 60 minutes
## Files Added/Modified
New boxes:
- core/box/ss_mem_lean_env_box.h
- core/box/ss_release_policy_box.{h,c}
- core/box/alloc_passdown_ssot_env_box.h
Scripts:
- scripts/soak_mixed_single_process.sh
- scripts/analyze_epoch_tail_csv.py
- scripts/soak_mixed_rss.sh
- scripts/calculate_percentiles.py
- scripts/analyze_soak.py
Documentation: Phase 40-60 analysis documents
## Design Decisions
1. Profile separation (core/bench_profile.h):
- MIXED_TINYV3_C7_SAFE: Speed-first (no LEAN)
- MIXED_TINYV3_C7_BALANCED: Balanced mode (LEAN+OFF)
2. Box Theory compliance:
- All ENV gates reversible (HAKMEM_SS_MEM_LEAN, HAKMEM_ALLOC_PASSDOWN_SSOT)
- Single conversion points maintained
- No physical deletions (compile-out only)
3. Lessons learned:
- SSOT effective only where redundancy exists (Phase 60 showed limits)
- Branch prediction extremely effective (~0 cycles for well-predicted branches)
- Early-exit pattern valuable even when seemingly redundant
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2025-12-17 06:24:01 +09:00
f99ef77ad7
Phase 29: Pool Hotbox v2 Stats Prune - NO-OP (infrastructure ready)
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Target: g_pool_hotbox_v2_stats atomics (12 total) in Pool v2
Result: 0.00% impact (code path inactive by default, ENV-gated)
Verdict: NO-OP - Maintain compile-out for future-proofing
Audit Results:
- Classification: 12/12 TELEMETRY (100% observational)
- Counters: alloc_calls, alloc_fast, alloc_refill, alloc_refill_fail,
alloc_fallback_v1, free_calls, free_fast, free_fallback_v1,
page_of_fail_* (4 failure counters)
- Verification: All stats/logging only, zero flow control usage
- Phase 28 lesson applied: Traced all usages, confirmed no CORRECTNESS
Key Finding: Pool v2 OFF by default
- Requires HAKMEM_POOL_V2_ENABLED=1 to activate
- Benchmark never executes Pool v2 code paths
- Compile-out has zero performance impact (code never runs)
Implementation (future-ready):
- Added HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED (default: 0)
- Wrapped 13 atomic write sites in core/hakmem_pool.c
- Pattern: #if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED ... #endif
- Expected impact if Pool v2 enabled: +0.3~0.8% (HOT+WARM atomics)
A/B Test Results:
- Baseline (COMPILED=0): 52.98 M ops/s (±0.43M, 0.81% stdev)
- Research (COMPILED=1): 53.31 M ops/s (±0.80M, 1.50% stdev)
- Delta: -0.62% (noise, not real effect - code path not active)
Critical Lesson Learned (NEW):
Phase 29 revealed ENV-gated features can appear on hot paths but never
execute. Updated audit checklist:
1. Classify atomics (CORRECTNESS vs TELEMETRY)
2. Verify no flow control usage
3. NEW: Verify code path is ACTIVE in benchmark (check ENV gates)
4. Implement compile-out
5. A/B test
Verification methods added to documentation:
- rg "getenv.*FEATURE" to check ENV gates
- perf record/report to verify execution
- Debug printf for quick validation
Cumulative Progress (Phase 24-29):
- Phase 24 (class stats): +0.93% GO
- Phase 25 (free stats): +1.07% GO
- Phase 26 (diagnostics): -0.33% NEUTRAL
- Phase 27 (unified cache): +0.74% GO
- Phase 28 (bg spill): NO-OP (all CORRECTNESS)
- Phase 29 (pool v2): NO-OP (inactive code path)
- Total: 17 atomics removed, +2.74% improvement
Documentation:
- PHASE29_POOL_HOTBOX_V2_AUDIT.md: Complete audit with TELEMETRY classification
- PHASE29_POOL_HOTBOX_V2_STATS_RESULTS.md: Results + new lesson learned
- ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md: Updated with Phase 29 + new checklist
- PHASE29_COMPLETE.md: Completion summary with recommendations
Decision: Keep compile-out despite NO-OP
- Code cleanliness (binary size reduction)
- Future-proofing (ready when Pool v2 enabled)
- Consistency with Phase 24-28 pattern
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-16 06:33:41 +09:00
4d9429e14c
Phase 19-7: LARSON_FIX TLS Consolidation — NO-GO (-1.34%)
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Goal: Eliminate 5 duplicate getenv("HAKMEM_TINY_LARSON_FIX") calls
- Create unified TLS cache box: tiny_larson_fix_tls_box.h
- Replace 5 separate static __thread blocks with single helper
Result: -1.34% throughput (54.55M → 53.82M ops/s)
- Expected: +0.3-0.7%
- Actual: -1.34%
- Decision: NO-GO, reverted immediately
Root cause: Compiler optimization works better with separate-scope TLS caches
- Each scope gets independent optimization
- Function call overhead outweighs duplication savings
- Rare case where duplication is optimal
Key learning: Not all code duplication is inefficient. Per-scope TLS
caching can outperform centralized caching when compiler can optimize
each scope independently.
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2025-12-15 22:27:19 +09:00
ec87025da6
Phase 17 v2 (FORCE_LIBC fix) + Phase 19-1b (FastLane Direct) — GO (+5.88%)
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## Phase 17 v2: FORCE_LIBC Gap Validation Fix
**Critical bug fix**: Phase 17 v1 の測定が壊れていた
**Problem**: HAKMEM_FORCE_LIBC_ALLOC=1 が FastLane より後でしか見えず、
same-binary A/B が実質 "hakmem vs hakmem" になっていた（+0.39% 誤測定）
**Fix**: core/box/hak_wrappers.inc.h:171 と :645 に g_force_libc_alloc==1 の
early bypass を追加、__libc_malloc/__libc_free に最初に直行
**Result**: 正しい同一バイナリ A/B 測定
- hakmem (FORCE_LIBC=0): 48.99M ops/s
- libc (FORCE_LIBC=1): 79.72M ops/s (+62.7%)
- system binary: 88.06M ops/s (+10.5% vs libc)
**Gap 分解**:
- Allocator 差: +62.7% (主戦場)
- Layout penalty: +10.5% (副次的)
**Conclusion**: Case A 確定 (allocator dominant, NOT layout)
Phase 17 v1 の Case B 判定は誤り。
Files:
- docs/analysis/PHASE17_FORCE_LIBC_GAP_VALIDATION_1_AB_TEST_RESULTS.md (v2)
- docs/analysis/PHASE17_FORCE_LIBC_GAP_VALIDATION_1_NEXT_INSTRUCTIONS.md (updated)
---
## Phase 19: FastLane Instruction Reduction Analysis
**Goal**: libc との instruction gap (-35% instructions, -56% branches) を削減
**perf stat 分析** (FORCE_LIBC=0 vs 1, 200M ops):
- hakmem: 209.09 instructions/op, 52.33 branches/op
- libc: 135.92 instructions/op, 22.93 branches/op
- Delta: +73.17 instructions/op (+53.8%), +29.40 branches/op (+128.2%)
**Hot path** (perf report):
- front_fastlane_try_free: 23.97% cycles
- malloc wrapper: 23.84% cycles
- free wrapper: 6.82% cycles
- **Wrapper overhead: ~55% of all cycles**
**Reduction candidates**:
- A: Wrapper layer 削除 (-17.5 inst/op, +10-15% 期待)
- B: ENV snapshot 統合 (-10.0 inst/op, +5-8%)
- C: Stats 削除 (-5.0 inst/op, +3-5%)
- D: Header inline (-4.0 inst/op, +2-3%)
- E: Route fast path (-3.5 inst/op, +2-3%)
Files:
- docs/analysis/PHASE19_FASTLANE_INSTRUCTION_REDUCTION_1_DESIGN.md
- docs/analysis/PHASE19_FASTLANE_INSTRUCTION_REDUCTION_2_NEXT_INSTRUCTIONS.md
---
## Phase 19-1b: FastLane Direct — GO (+5.88%)
**Strategy**: Wrapper layer を bypass し、core allocator を直接呼ぶ
- free() → free_tiny_fast() (not free_tiny_fast_hot)
- malloc() → malloc_tiny_fast()
**Phase 19-1 が NO-GO (-3.81%) だった原因**:
1. __builtin_expect(fastlane_direct_enabled(), 0) が逆効果（A/B 不公平）
2. free_tiny_fast_hot() が誤選択（free_tiny_fast() が勝ち筋）
**Phase 19-1b の修正**:
1. __builtin_expect() 削除
2. free_tiny_fast() を直接呼び出し
**Result** (Mixed, 10-run, 20M iters, ws=400):
- Baseline (FASTLANE_DIRECT=0): 49.17M ops/s
- Optimized (FASTLANE_DIRECT=1): 52.06M ops/s
- **Delta: +5.88%** (GO 基準 +5% クリア)
**perf stat** (200M iters):
- Instructions/op: 199.90 → 169.45 (-30.45, -15.23%)
- Branches/op: 51.49 → 41.52 (-9.97, -19.36%)
- Cycles/op: 88.88 → 84.37 (-4.51, -5.07%)
- I-cache miss: 111K → 98K (-11.79%)
**Trade-offs** (acceptable):
- iTLB miss: +41.46% (front-end cost)
- dTLB miss: +29.15% (backend cost)
- Overall gain (+5.88%) outweighs costs
**Implementation**:
1. **ENV gate**: core/box/fastlane_direct_env_box.{h,c}
- HAKMEM_FASTLANE_DIRECT=0/1 (default: 0, opt-in)
- Single _Atomic global (wrapper キャッシュ問題を解決)
2. **Wrapper 修正**: core/box/hak_wrappers.inc.h
- malloc: direct call to malloc_tiny_fast() when FASTLANE_DIRECT=1
- free: direct call to free_tiny_fast() when FASTLANE_DIRECT=1
- Safety: !g_initialized では direct 使わない、fallback 維持
3. **Preset 昇格**: core/bench_profile.h:88
- bench_setenv_default("HAKMEM_FASTLANE_DIRECT", "1")
- Comment: +5.88% proven on Mixed, 10-run
4. **cleanenv 更新**: scripts/run_mixed_10_cleanenv.sh:22
- HAKMEM_FASTLANE_DIRECT=${HAKMEM_FASTLANE_DIRECT:-1}
- Phase 9/10 と同様に昇格
**Verdict**: GO — 本線採用、プリセット昇格完了
**Rollback**: HAKMEM_FASTLANE_DIRECT=0 で既存 FastLane path に戻る
Files:
- core/box/fastlane_direct_env_box.{h,c} (new)
- core/box/hak_wrappers.inc.h (modified)
- core/bench_profile.h (preset promotion)
- scripts/run_mixed_10_cleanenv.sh (ENV default aligned)
- Makefile (new obj)
- docs/analysis/PHASE19_1B_FASTLANE_DIRECT_REVISED_AB_TEST_RESULTS.md
---
## Cumulative Performance
- Baseline (all optimizations OFF): ~40M ops/s (estimated)
- Current (Phase 19-1b): 52.06M ops/s
- **Cumulative gain: ~+30% from baseline**
Remaining gap to libc (79.72M):
- Current: 52.06M ops/s
- Target: 79.72M ops/s
- **Gap: +53.2%** (was +62.7% before Phase 19-1b)
Next: Phase 19-2 (ENV snapshot consolidation, +5-8% expected)
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-15 11:28:40 +09:00
bc2c5ded76
Phase 18 v2: BENCH_MINIMAL — NEUTRAL (+2.32% throughput, -5.06% instructions)
...
## Summary
Phase 18 v2 attempted instruction count reduction via conditional compilation:
- Stats collection → no-op
- ENV checks → constant propagation
- Binary size: 653K → 649K (-4K, -0.6%)
Result: NEUTRAL (below GO threshold)
- Throughput: +2.32% (target: +5% minimum) ❌
- Instructions: -5.06% (target: -15% minimum) ❌
- Cycles: -3.26% (positive signal)
- Branches: -8.67% (positive signal)
- Cache-misses: +30% (unexpected, likely layout)
## Analysis
Positive signals:
- Implementation correct (Branch -8.67%, Instruction -5.06%)
- Binary size reduced (-4K)
- Modest throughput gain (+2.32%)
- Cycles and branch overhead reduced
Negative signals:
- Instruction reduction insufficient (-5.06% << -15% smoking gun)
- Throughput gain below +5% threshold
- Cache-misses increased (+30%, layout noise?)
## Verdict
Freeze Phase 18 v2 (weak positive, insufficient for production).
Per user guidance: "If instructions don't drop clearly, continuation value is thin."
-5.06% instruction reduction is marginal. Allocator micro-optimization plateau confirmed.
## Key Insight
Phase 17 showed:
- IPC = 2.30 (consistent, memory-bound)
- I-cache gap: 55% (Phase 17: 153K → 68K)
- Instruction gap: 48% (Phase 17: 41.3B → 21.5B)
Phase 18 v1/v2 results confirm:
- Layout tweaks are fragile (v1: I-cache +91%)
- Instruction removal is modest benefit (v2: -5.06%)
- Allocator is NOT the bottleneck (IPC constant, memory-limited)
## Recommendation
Do NOT continue Phase 18 micro-optimizations.
Next frontier requires different approach:
1. Architectural redesign (SIMD, lock-free, batching)
2. Memory layout optimization (cache-friendly structures)
3. Broader profiling (not allocator-focused)
Or: Accept that 48M → 85M (75% gap) is achievable with current architecture.
Files:
- docs/analysis/PHASE18_HOT_TEXT_ISOLATION_2_AB_TEST_RESULTS.md (results)
- CURRENT_TASK.md (Phase 18 complete status)
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2025-12-15 06:02:28 +09:00
87fa27518c
Phase 15 v1: UnifiedCache FIFO→LIFO NEUTRAL (-0.70% Mixed, +0.42% C7)
...
Transform existing array-based UnifiedCache from FIFO ring to LIFO stack.
A/B Results:
- Mixed (16-1024B): -0.70% (52,965,966 → 52,593,948 ops/s)
- C7-only (1025-2048B): +0.42% (78,010,783 → 78,335,509 ops/s)
Verdict: NEUTRAL (both below +1.0% GO threshold) - freeze as research box
Implementation:
- L0 ENV gate: tiny_unified_lifo_env_box.{h,c} (HAKMEM_TINY_UNIFIED_LIFO=0/1)
- L1 LIFO ops: tiny_unified_lifo_box.h (unified_cache_try_pop/push_lifo)
- L2 integration: tiny_front_hot_box.h (mode check at entry)
- Reuses existing slots[] array (no intrusive pointers)
Root Causes:
1. Mode check overhead (tiny_unified_lifo_enabled() call)
2. Minimal LIFO vs FIFO locality delta in practice
3. Existing FIFO ring already well-optimized
Bonus Fix: LTO bug for tiny_c7_preserve_header_enabled() (Phase 13/14 latent issue)
- Converted static inline to extern + non-inline implementation
- Fixes undefined reference during LTO linking
Design: docs/analysis/PHASE15_UNIFIEDCACHE_LIFO_1_DESIGN.md
Results: docs/analysis/PHASE15_UNIFIEDCACHE_LIFO_1_AB_TEST_RESULTS.md
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-15 02:19:26 +09:00
71b1354d32
Phase 10: FREE-TINY-FAST MONO LEGACY DIRECT (GO +1.89%)
...
Results:
- A/B test: +1.89% on Mixed (10-run, clean env)
- Baseline: 51.96M ops/s
- Optimized: 52.94M ops/s
- Improvement: +984K ops/s (+1.89%)
- C6-heavy verification: +7.86% (nonlegacy_mask works correctly, no misfires)
Strategy:
- Extend Phase 9 (C0-C3 DUALHOT) to C4-C7 LEGACY DIRECT
- Fail-Fast principle: Never misclassify MID/ULTRA/V7 as LEGACY
- nonlegacy_mask: Cached at init, hot path uses single bit operation
Success factors:
1. Performance improvement: +1.89% (1.9x GO threshold)
2. Safety verified: nonlegacy_mask prevents MID v3 misfire in C6-heavy
3. Phase 9 coexistence: C0-C3 (Phase 9) + C4-C7 (Phase 10) = full LEGACY coverage
4. Minimal overhead: Single bit operation in hot path (mask & (1u<<class))
Implementation:
- Patch 1: ENV gate box (free_tiny_fast_mono_legacy_direct_env_box.h)
- ENV: HAKMEM_FREE_TINY_FAST_MONO_LEGACY_DIRECT=0/1 (default 0)
- nonlegacy_mask cached (reuses free_policy_fast_v2_nonlegacy_mask())
- Probe window: 64 (avoid bench_profile putenv race)
- Patch 2: Early-exit in free_tiny_fast() (malloc_tiny_fast.h)
- Conditions: !nonlegacy_mask, route==LEGACY, !LARSON_FIX, done==1
- Direct call: tiny_legacy_fallback_free_base()
- Patch 3: Visibility (free_path_stats_box.h)
- mono_legacy_direct_hit counter (compile-out in release)
- Patch 4: cleanenv extension (run_mixed_10_cleanenv.sh)
- ENV leak protection
Safety verification (C6-heavy):
- OFF: 19.75M ops/s
- ON: 21.30M ops/s (+7.86%)
- nonlegacy_mask correctly excludes C6 (MID v3 active)
- Improvement from C0-C5, C7 direct path acceleration
Files modified:
- core/bench_profile.h: add to MIXED_TINYV3_C7_SAFE preset
- core/front/malloc_tiny_fast.h: early-exit insertion
- core/box/free_path_stats_box.h: counter
- core/box/free_tiny_fast_mono_legacy_direct_env_box.h: NEW (ENV gate + nonlegacy_mask)
- scripts/run_mixed_10_cleanenv.sh: ENV leak protection
Health check: PASSED (all profiles)
Promotion: Added to MIXED_TINYV3_C7_SAFE preset (default ON, opt-out)
Rollback: HAKMEM_FREE_TINY_FAST_MONO_LEGACY_DIRECT=0
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-14 20:09:40 +09:00
871034da1f
Phase 9: FREE-TINY-FAST MONO DUALHOT (GO +2.72%)
...
Results:
- A/B test: +2.72% on Mixed (10-run, clean env)
- Baseline: 48.89M ops/s
- Optimized: 50.22M ops/s
- Improvement: +1.33M ops/s (+2.72%)
- Stability: Standard deviation reduced by 60.8% (2.44M → 955K ops/s)
Strategy:
- Transplant C0-C3 "second hot" path to monolithic free_tiny_fast()
- Early-exit within monolithic (no hot/cold split)
- FastLane free now benefits from C0-C3 direct path
Success factors:
1. Performance improvement: +2.72% (2.7x GO threshold)
2. Stability improvement: 2.6x more stable (stdev 60.8% reduction)
3. Learned from Phase 7 failure:
- Phase 7: Function split (hot/cold) → NO-GO
- Phase 9: Early-exit within monolithic → GO
4. FastLane free compatibility: C0-C3 direct path now works with FastLane
5. Policy snapshot overhead reduction: C0-C3 (48% of Mixed) skip route lookup
Implementation:
- Patch 1: ENV gate box (free_tiny_fast_mono_dualhot_env_box.h)
- ENV: HAKMEM_FREE_TINY_FAST_MONO_DUALHOT=0/1 (default 0)
- Probe window: 64 (avoid bench_profile putenv race)
- Patch 2: Early-exit in free_tiny_fast() (malloc_tiny_fast.h)
- Conditions: class_idx <= 3, !LARSON_FIX, route==LEGACY
- Direct call: tiny_legacy_fallback_free_base()
- Patch 3: Visibility (free_path_stats_box.h)
- mono_dualhot_hit counter (compile-out in release)
- Patch 4: cleanenv extension (run_mixed_10_cleanenv.sh)
- ENV leak protection
Files modified:
- core/bench_profile.h: add to MIXED_TINYV3_C7_SAFE preset
- core/front/malloc_tiny_fast.h: early-exit insertion
- core/box/free_path_stats_box.h: counter
- core/box/free_tiny_fast_mono_dualhot_env_box.h: NEW (ENV gate)
- scripts/run_mixed_10_cleanenv.sh: ENV leak protection
Health check: PASSED (all profiles)
Promotion: Added to MIXED_TINYV3_C7_SAFE preset (default ON, opt-out)
Rollback: HAKMEM_FREE_TINY_FAST_MONO_DUALHOT=0
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-14 19:16:49 +09:00
ea221d057a
Phase 6: promote Front FastLane (default ON)
2025-12-14 16:28:23 +09:00
4124c86d99
Phase 5: freeze E5-4 malloc tiny direct (neutral)
2025-12-14 06:59:35 +09:00
f7b18aaf13
Phase 5 E5-2: Header Write-Once (NEUTRAL, FROZEN)
...
Target: tiny_region_id_write_header (3.35% self%)
- Hypothesis: Headers redundant for reused blocks
- Strategy: Write headers ONCE at refill boundary, skip in hot alloc
Implementation:
- ENV gate: HAKMEM_TINY_HEADER_WRITE_ONCE=0/1 (default 0)
- core/box/tiny_header_write_once_env_box.h: ENV gate
- core/box/tiny_header_write_once_stats_box.h: Stats counters
- core/box/tiny_header_box.h: Added tiny_header_finalize_alloc()
- core/front/tiny_unified_cache.c: Prefill at 3 refill sites
- core/box/tiny_front_hot_box.h: Use finalize function
A/B Test Results (Mixed, 10-run, 20M iters):
- Baseline (WRITE_ONCE=0): 44.22M ops/s (mean), 44.53M ops/s (median)
- Optimized (WRITE_ONCE=1): 44.42M ops/s (mean), 44.36M ops/s (median)
- Improvement: +0.45% mean, -0.38% median
Decision: NEUTRAL (within ±1.0% threshold)
- Action: FREEZE as research box (default OFF, do not promote)
Root Cause Analysis:
- Header writes are NOT redundant - existing code writes only when needed
- Branch overhead (~4 cycles) cancels savings (~3-5 cycles)
- perf self% ≠ optimization ROI (3.35% target → +0.45% gain)
Key Lessons:
1. Verify assumptions before optimizing (inspect code paths)
2. Hot spot self% measures time IN function, not savings from REMOVING it
3. Branch overhead matters (even "simple" checks add cycles)
Positive Outcome:
- StdDev reduced 50% (0.96M → 0.48M) - more stable performance
Health Check: PASS (all profiles)
Next Candidates:
- free_tiny_fast_cold: 7.14% self%
- unified_cache_push: 3.39% self%
- hakmem_env_snapshot_enabled: 2.97% self%
Deliverables:
- docs/analysis/PHASE5_E5_2_HEADER_REFILL_ONCE_DESIGN.md
- docs/analysis/PHASE5_E5_2_HEADER_REFILL_ONCE_AB_TEST_RESULTS.md
- CURRENT_TASK.md (E5-2 complete, FROZEN)
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-14 06:22:25 +09:00
8875132134
Phase 5 E5-1: Free Tiny Direct Path (+3.35% GO)
...
Target: Consolidate free() wrapper overhead (29.56% combined)
- free() wrapper: 21.67% self%
- free_tiny_fast_cold(): 7.89% self%
Strategy: Single header check in wrapper → direct call to free_tiny_fast()
- Eliminates redundant header validation (validated twice before)
- Bypasses cold path routing for Tiny allocations
- High coverage: 48% of frees in Mixed workload are Tiny
Implementation:
- ENV gate: HAKMEM_FREE_TINY_DIRECT=0/1 (default 0)
- core/box/free_tiny_direct_env_box.h: ENV gate
- core/box/free_tiny_direct_stats_box.h: Stats counters
- core/box/hak_wrappers.inc.h: Wrapper integration (lines 593-625)
Safety gates:
- Page boundary guard ((ptr & 0xFFF) != 0)
- Tiny magic validation ((header & 0xF0) == 0xA0)
- Class bounds check (class_idx < 8)
- Fail-fast fallback to existing paths
A/B Test Results (Mixed, 10-run, 20M iters):
- Baseline (DIRECT=0): 44.38M ops/s (mean), 44.45M ops/s (median)
- Optimized (DIRECT=1): 45.87M ops/s (mean), 45.95M ops/s (median)
- Improvement: +3.35% mean, +3.36% median
Decision: GO (+3.35% >= +1.0% threshold)
- 3rd consecutive success with consolidation/deduplication pattern
- E4-1: +3.51%, E4-2: +21.83%, E5-1: +3.35%
- Health check: PASS (all profiles)
Phase 5 Cumulative:
- E4 Combined: +6.43%
- E5-1: +3.35%
- Estimated total: ~+10%
Deliverables:
- docs/analysis/PHASE5_E5_COMPREHENSIVE_ANALYSIS.md
- docs/analysis/PHASE5_E5_1_FREE_TINY_DIRECT_1_DESIGN.md
- docs/analysis/PHASE5_E5_1_FREE_TINY_DIRECT_1_AB_TEST_RESULTS.md
- CURRENT_TASK.md (E5-1 complete)
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-14 05:52:32 +09:00
5528612f2a
Phase 5 E4-2: Malloc Wrapper ENV Snapshot (+21.83% GO, ADOPTED)
...
Target: Consolidate malloc wrapper TLS reads + eliminate function calls
- malloc (16.13%) + tiny_alloc_gate_fast (19.50%) = 35.63% combined
- Strategy: E4-1 success pattern + function call elimination
Implementation:
- ENV gate: HAKMEM_MALLOC_WRAPPER_ENV_SNAPSHOT=0/1 (default 0)
- core/box/malloc_wrapper_env_snapshot_box.{h,c}: New box
- Consolidates multiple TLS reads → 1 TLS read
- Pre-caches tiny_max_size() == 256 (eliminates function call)
- Lazy init with probe window (bench_profile putenv sync)
- core/box/hak_wrappers.inc.h: Integration in malloc() wrapper
- Makefile: Add malloc_wrapper_env_snapshot_box.o to all targets
A/B Test Results (Mixed, 10-run, 20M iters):
- Baseline (SNAPSHOT=0): 35.74M ops/s (mean), 35.75M ops/s (median)
- Optimized (SNAPSHOT=1): 43.54M ops/s (mean), 43.92M ops/s (median)
- Improvement: +21.83% mean, +22.86% median (+7.80M ops/s)
Decision: GO (+21.83% >> +1.0% threshold, 21.8x over)
- Why 6.2x better than E4-1 (+3.51%)?
- Higher malloc call frequency (allocation-heavy workload)
- Function call elimination (tiny_max_size pre-cached)
- Larger target: 35.63% vs free's 25.26%
- Health check: PASS (all profiles)
- Action: PROMOTED to MIXED_TINYV3_C7_SAFE preset
Phase 5 Cumulative (estimated):
- E1 (ENV Snapshot): +3.92%
- E4-1 (Free Wrapper Snapshot): +3.51%
- E4-2 (Malloc Wrapper Snapshot): +21.83%
- Estimated combined: ~+30% (needs validation)
Next Steps:
- Combined A/B test (E4-1 + E4-2 simultaneously)
- Measure actual cumulative effect
- Profile new baseline for next optimization targets
Deliverables:
- docs/analysis/PHASE5_E4_2_MALLOC_WRAPPER_ENV_SNAPSHOT_1_DESIGN.md
- docs/analysis/PHASE5_E4_2_MALLOC_WRAPPER_ENV_SNAPSHOT_1_AB_TEST_RESULTS.md
- docs/analysis/PHASE5_E4_2_MALLOC_WRAPPER_ENV_SNAPSHOT_NEXT_INSTRUCTIONS.md
- docs/analysis/PHASE5_E4_COMBINED_AB_TEST_NEXT_INSTRUCTIONS.md (next)
- docs/analysis/ENV_PROFILE_PRESETS.md (E4-2 added)
- CURRENT_TASK.md (E4-2 complete)
- core/bench_profile.h (E4-2 promoted to default)
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-14 05:13:29 +09:00
4a070d8a14
Phase 5 E4-1: Free Wrapper ENV Snapshot (+3.51% GO, ADOPTED)
...
Target: Consolidate free wrapper TLS reads (2→1)
- free() is 25.26% self% (top hot spot)
- Strategy: Apply E1 success pattern (ENV snapshot) to free path
Implementation:
- ENV gate: HAKMEM_FREE_WRAPPER_ENV_SNAPSHOT=0/1 (default 0)
- core/box/free_wrapper_env_snapshot_box.{h,c}: New box
- Consolidates 2 TLS reads → 1 TLS read (50% reduction)
- Reduces 4 branches → 3 branches (25% reduction)
- Lazy init with probe window (bench_profile putenv sync)
- core/box/hak_wrappers.inc.h: Integration in free() wrapper
- Makefile: Add free_wrapper_env_snapshot_box.o to all targets
A/B Test Results (Mixed, 10-run, 20M iters):
- Baseline (SNAPSHOT=0): 45.35M ops/s (mean), 45.31M ops/s (median)
- Optimized (SNAPSHOT=1): 46.94M ops/s (mean), 47.15M ops/s (median)
- Improvement: +3.51% mean, +4.07% median
Decision: GO (+3.51% >= +1.0% threshold)
- Exceeded conservative estimate (+1.5% → +3.51%)
- Similar efficiency to E1 (+3.92%)
- Health check: PASS (all profiles)
- Action: PROMOTED to MIXED_TINYV3_C7_SAFE preset
Phase 5 Cumulative:
- E1 (ENV Snapshot): +3.92%
- E4-1 (Free Wrapper Snapshot): +3.51%
- Total Phase 4-5: ~+7.5%
E3-4 Correction:
- Phase 4 E3-4 (ENV Constructor Init): NO-GO / FROZEN
- Initial A/B showed +4.75%, but investigation revealed:
- Branch prediction hint mismatch (UNLIKELY with always-true)
- Retest confirmed -1.78% regression
- Root cause: __builtin_expect(..., 0) with ctor_mode==1
- Decision: Freeze as research box (default OFF)
- Learning: Branch hints need careful tuning, TLS consolidation safer
Deliverables:
- docs/analysis/PHASE5_E4_FREE_GATE_OPTIMIZATION_1_DESIGN.md
- docs/analysis/PHASE5_E4_1_FREE_WRAPPER_ENV_SNAPSHOT_NEXT_INSTRUCTIONS.md
- docs/analysis/PHASE5_E4_2_MALLOC_WRAPPER_ENV_SNAPSHOT_NEXT_INSTRUCTIONS.md (next)
- docs/analysis/PHASE5_POST_E1_NEXT_INSTRUCTIONS.md
- docs/analysis/ENV_PROFILE_PRESETS.md (E4-1 added, E3-4 corrected)
- CURRENT_TASK.md (E4-1 complete, E3-4 frozen)
- core/bench_profile.h (E4-1 promoted to default)
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com >
2025-12-14 04:24:34 +09:00
7f3ff6c7e6
Phase 4: E1 docs + E2 next instructions
2025-12-14 01:46:18 +09:00
11b0e3f32b
Phase 4 D3: alloc gate shape (env-gated)
2025-12-14 00:26:57 +09:00
19056282b6
Phase 3 D2: Wrapper Env Cache - [DECISION: NO-GO]
...
Target: Reduce wrapper_env_cfg() overhead in malloc/free hot path
- Strategy: Cache wrapper env configuration pointer in TLS
- Approach: Fast pointer cache (TLS caches const wrapper_env_cfg_t*)
Implementation:
- core/box/wrapper_env_cache_env_box.h: ENV gate (HAKMEM_WRAP_ENV_CACHE)
- core/box/wrapper_env_cache_box.h: TLS cache layer (wrapper_env_cfg_fast)
- core/box/hak_wrappers.inc.h: Integration into malloc/free hot paths
- ENV gate: HAKMEM_WRAP_ENV_CACHE=0/1 (default OFF)
A/B Test Results (Mixed, 10-run, 20M iters):
- Baseline (D2=0): 46.52M ops/s (avg), 46.47M ops/s (median)
- Optimized (D2=1): 45.85M ops/s (avg), 45.98M ops/s (median)
- Improvement: avg -1.44%, median -1.05% (DECISION: NO-GO)
Analysis:
- Regression cause: TLS cache adds overhead (branch + TLS access)
- wrapper_env_cfg() is already minimal (pointer return after simple check)
- Adding TLS caching layer makes it worse, not better
- Branch prediction penalty outweighs any potential savings
Cumulative Phase 2-3:
- B3: +2.89%, B4: +1.47%, C3: +2.20%
- D1: +1.06% (opt-in), D2: -1.44% (NO-GO)
- Total: ~7.2% (excluding D2)
Decision: FREEZE as research box (default OFF, regression confirmed)
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com >
2025-12-13 22:03:27 +09:00
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
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
d5ffb3eeb2
Fix MID v3.5 activation bugs: policy loop + malloc recursion
...
Two critical bugs fixed:
1. Policy snapshot infinite loop (smallobject_policy_v7.c):
- Condition `g_policy_v7_version == 0` caused reinit on every call
- Fixed via CAS to set global version to 1 after first init
2. Malloc recursion (smallobject_segment_mid_v3.c):
- Internal malloc() routed back through hakmem → MID v3.5 → segment
creation → malloc → infinite recursion / stack overflow
- Fixed by using mmap() directly for internal allocations:
- Segment struct, pages array, page metadata block
Performance results (bench_random_mixed 257-512B):
- Baseline (LEGACY): 34.0M ops/s
- MID_V35 ON (C6): 35.8M ops/s
- Improvement: +5.1% ✓
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com >
2025-12-12 07:12:24 +09:00
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
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
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
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
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
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
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
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)
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com >
2025-12-11 19:17:30 +09:00
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
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
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
a905e0ffdd
Guard madvise ENOMEM and stabilize pool/tiny front v3
2025-12-09 21:50:15 +09:00
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
9502501842
Fix tiny lane success handling for TinyHeap routes
2025-12-07 23:06:50 +09:00
a6991ec9e4
Add TinyHeap class mask and extend routing
2025-12-07 22:49:28 +09:00
fda6cd2e67
Boxify superslab registry, add bench profile, and document C7 hotpath experiments
2025-12-07 03:12:27 +09:00
d5e6ed535c
P-Tier + Tiny Route Policy: Aggressive Superslab Management + Safe Routing
...
## Phase 1: Utilization-Aware Superslab Tiering (案B実装済)
- Add ss_tier_box.h: Classify SuperSlabs into HOT/DRAINING/FREE based on utilization
- HOT (>25%): Accept new allocations
- DRAINING (≤25%): Drain only, no new allocs
- FREE (0%): Ready for eager munmap
- Enhanced shared_pool_release_slab():
- Check tier transition after each slab release
- If tier→FREE: Force remaining slots to EMPTY and call superslab_free() immediately
- Bypasses LRU cache to prevent registry bloat from accumulating DRAINING SuperSlabs
- Test results (bench_random_mixed_hakmem):
- 1M iterations: ✅ ~1.03M ops/s (previously passed)
- 10M iterations: ✅ ~1.15M ops/s (previously: registry full error)
- 50M iterations: ✅ ~1.08M ops/s (stress test)
## Phase 2: Tiny Front Routing Policy (新規Box)
- Add tiny_route_box.h/c: Single 8-byte table for class→routing decisions
- ROUTE_TINY_ONLY: Tiny front exclusive (no fallback)
- ROUTE_TINY_FIRST: Try Tiny, fallback to Pool if fails
- ROUTE_POOL_ONLY: Skip Tiny entirely
- Profiles via HAKMEM_TINY_PROFILE ENV:
- "hot": C0-C3=TINY_ONLY, C4-C6=TINY_FIRST, C7=POOL_ONLY
- "conservative" (default): All TINY_FIRST
- "off": All POOL_ONLY (disable Tiny)
- "full": All TINY_ONLY (microbench mode)
- A/B test results (ws=256, 100k ops random_mixed):
- Default (conservative): ~2.90M ops/s
- hot: ~2.65M ops/s (more conservative)
- off: ~2.86M ops/s
- full: ~2.98M ops/s (slightly best)
## Design Rationale
### Registry Pressure Fix (案B)
- Problem: DRAINING tier SS occupied registry indefinitely
- Solution: When total_active_blocks→0, immediately free to clear registry slot
- Result: No more "registry full" errors under stress
### Routing Policy Box (新)
- Problem: Tiny front optimization scattered across ENV/branches
- Solution: Centralize routing in single table, select profiles via ENV
- Benefit: Safe A/B testing without touching hot path code
- Future: Integrate with RSS budget/learning layers for dynamic profile switching
## Next Steps (性能最適化)
- Profile Tiny front internals (TLS SLL, FastCache, Superslab backend latency)
- Identify bottleneck between current ~2.9M ops/s and mimalloc ~100M ops/s
- Consider:
- Reduce shared pool lock contention
- Optimize unified cache hit rate
- Streamline Superslab carving logic
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude <noreply@anthropic.com >
2025-12-04 18:01:25 +09:00
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
25cb7164c7
Comprehensive legacy cleanup and architecture consolidation
...
Summary of Changes:
MOVED TO ARCHIVE:
- core/hakmem_tiny_legacy_slow_box.inc → archive/
* Slow path legacy code preserved for reference
* Superseded by Gatekeeper Box architecture
- core/superslab_allocate.c → archive/superslab_allocate_legacy.c
* Legacy SuperSlab allocation implementation
* Functionality integrated into new Box system
- core/superslab_head.c → archive/superslab_head_legacy.c
* Legacy slab head management
* Refactored through Box architecture
REMOVED DEAD CODE:
- Eliminated unused allocation policy variants from ss_allocation_box.c
* Reduced from 127+ lines of conditional logic to focused implementation
* Removed: old policy branches, unused allocation strategies
* Kept: current Box-based allocation path
ADDED NEW INFRASTRUCTURE:
- core/superslab_head_stub.c (41 lines)
* Minimal stub for backward compatibility
* Delegates to new architecture
- Enhanced core/superslab_cache.c (75 lines added)
* Added missing API functions for cache management
* Proper interface for SuperSlab cache integration
REFACTORED CORE SYSTEMS:
- core/hakmem_super_registry.c
* Moved registration logic from scattered locations
* Centralized SuperSlab registry management
- core/hakmem_tiny.c
* Removed 27 lines of redundant initialization
* Simplified through Box architecture
- core/hakmem_tiny_alloc.inc
* Streamlined allocation path to use Gatekeeper
* Removed legacy decision logic
- core/box/ss_allocation_box.c/h
* Dramatically simplified allocation policy
* Removed conditional branches for unused strategies
* Focused on current Box-based approach
BUILD SYSTEM:
- Updated Makefile for archive structure
- Removed obsolete object file references
- Maintained build compatibility
SAFETY & TESTING:
- All deletions verified: no broken references
- Build verification: RELEASE=0 and RELEASE=1 pass
- Smoke tests: 100% pass rate
- Functional verification: allocation/free intact
Architecture Consolidation:
Before: Multiple overlapping allocation paths with legacy code branches
After: Single unified path through Gatekeeper Boxes with clear architecture
Benefits:
- Reduced code size and complexity
- Improved maintainability
- Single source of truth for allocation logic
- Better diagnostic/observability hooks
- Foundation for future optimizations
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude <noreply@anthropic.com >
2025-12-04 14:22:48 +09:00
a0a80f5403
Remove legacy redundant code after Gatekeeper Box consolidation
...
Summary of Deletions:
- Remove core/box/unified_batch_box.c (26 lines)
* Legacy batch allocation logic superseded by Alloc Gatekeeper Box
* unified_cache now handles allocation aggregation
- Remove core/box/unified_batch_box.h (29 lines)
* Header declarations for deprecated unified_batch_box module
- Remove core/tiny_free_fast.inc.h (329 lines)
* Legacy fast-path free implementation
* Functionality consolidated into:
- tiny_free_gate_box.h (Fail-Fast layer + diagnostics)
- malloc_tiny_fast.h (Free path integration)
- unified_cache (return to freelist)
* Code path now routes through Gatekeeper Box for consistency
Build System Updates:
- Update Makefile
* Remove unified_batch_box.o from OBJS_BASE
* Remove unified_batch_box_shared.o from SHARED_OBJS
* Remove unified_batch_box.o from BENCH_HAKMEM_OBJS_BASE
- Update core/hakmem_tiny_phase6_wrappers_box.inc
* Remove unified_batch_box references
* Simplify allocation wrapper to use new Gatekeeper architecture
Impact:
- Removes ~385 lines of redundant/superseded code
- Consolidates allocation logic through unified Gatekeeper entry points
- All functionality preserved via new Box-based architecture
- Simplifies codebase and reduces maintenance burden
Testing:
- Build verification: make clean && make RELEASE=0/1
- Smoke tests: All pass (simple_alloc, loop 10M, pool_tls)
- No functional regressions
Rationale:
After implementing Alloc/Free Gatekeeper Boxes with Fail-Fast layers
and Unified Cache type safety, the legacy separate implementations
became redundant. This commit completes the architectural consolidation
and simplifies the allocator codebase.
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude <noreply@anthropic.com >
2025-12-04 12:55:53 +09:00
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
2dc9d5d596
Fix include order in hakmem.c - move hak_kpi_util.inc.h before hak_core_init.inc.h
...
Problem: hak_core_init.inc.h references KPI measurement variables
(g_latency_histogram, g_latency_samples, g_baseline_soft_pf, etc.)
but hakmem.c was including hak_kpi_util.inc.h AFTER hak_core_init.inc.h,
causing undefined reference errors.
Solution: Reorder includes so hak_kpi_util.inc.h (definition) comes
before hak_core_init.inc.h (usage).
Build result: ✅ Success (libhakmem.so 547KB, 0 errors)
Minor changes:
- Added extern __thread declarations for TLS SLL debug variables
- Added signal handler logging for debug_dump_last_push
- Improved hakmem_tiny.c structure for Phase 2 preparation
🤖 Generated with Claude Code + Task Agent
Co-Authored-By: Gemini <gemini@example.com >
Co-Authored-By: Claude <noreply@anthropic.com >
2025-12-03 13:28:44 +09:00
bd5e97f38a
Save current state before investigating TLS_SLL_HDR_RESET
2025-12-03 10:34:39 +09:00
