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Phase 14 kickoff: Pointer-chase reduction (tcache-style intrusive LIFO)
Design and implementation plan for Phase 14 v1:
- Target: Reduce pointer-chase overhead in TinyUnifiedCache
- Strategy: Add intrusive LIFO tcache layer before array-based cache
- Inspired by glibc tcache (per-bin head pointer, intrusive next)
Approach:
- L0: tiny_tcache_env_box (ENV gate: HAKMEM_TINY_TCACHE=0/1, default OFF)
- L1: tiny_tcache_box (intrusive LIFO: push/pop with cap=64)
- Integration: Inside unified_cache_push/pop (minimal call site changes)
Expected benefits:
- tcache hit: No array access, just head pointer + intrusive next
- Better locality (LIFO vs FIFO)
- Closer to system malloc tcache behavior
A/B plan:
- Test: HAKMEM_TINY_TCACHE=0/1 on Mixed 10-run
- GO threshold: +1.0% mean
- Rollback: ENV-gated, default OFF
Files added:
- docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md
- docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md
Next: Implement Phase 14 v1 patches (ENV box → tcache box → integration)
🤖 Generated with Claude Code
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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2025-12-15 00:32:56 +09:00 |
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