Moe Charm (CI)
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
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