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b6010dd253
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Modularize Warm Pool with 3 Box Refactorings - Phase B-3a Complete
Objective: Clean up warm pool implementation by extracting inline boxes
for statistics, carving, and prefill logic. Achieved full modularity
with zero performance regression using aggressive inline optimization.
Changes:
1. **Legacy Code Removal** (Phase 0)
- Removed unused static __thread prefill_attempt_count variable
- Cleaned up duplicate comments
- Simplified carve failure handling
2. **Warm Pool Statistics Box** (Phase 1)
- New file: core/box/warm_pool_stats_box.h
- Inline APIs: warm_pool_record_hit/miss/prefilled()
- All statistics recording externalized
- Integrated into unified_cache.c
- Performance: 0 cost (inlined to direct memory write)
3. **Slab Carving Box** (Phase 2)
- New file: core/box/slab_carve_box.h
- Inline API: slab_carve_from_ss()
- Extracted unified_cache_carve_from_ss() function
- Now reusable by other refill paths (P0, etc.)
- Performance: 100% inlined, O(slabs) scan unchanged
4. **Warm Pool Prefill Box** (Phase 3)
- New file: core/box/warm_pool_prefill_box.h
- Inline API: warm_pool_do_prefill()
- Extracted prefill loop with configurable budget
- WARM_POOL_PREFILL_BUDGET = 3 (tunable)
- Cold path optimization (only on empty pool)
- Performance: Cold path cost (non-critical)
Architecture:
- core/front/tiny_unified_cache.c now 40+ lines shorter
- Logic distributed to 3 well-defined boxes
- Each box has single responsibility (SRP)
- Inline compilation preserves hot path performance
- LTO (-flto) enables cross-file inlining
Performance Results:
- 1M allocations: 4.099M ops/s (maintained)
- 5M allocations: 4.046M ops/s (maintained)
- 55.6% warm pool hit rate (unchanged)
- Zero regression on throughput
- All three boxes fully inlined by compiler
Code Quality Improvements:
✅ Removed legacy unused variables
✅ Separated concerns into specialized boxes
✅ Improved readability and maintainability
✅ Preserved performance via aggressive inline
✅ Enabled future reuse (carve box for P0)
Testing:
✅ Compilation: No errors
✅ Functionality: 1M and 5M allocation tests pass
✅ Performance: Baseline maintained
✅ Statistics: Output identical to pre-refactor
Next Phase: Consider similar modularization for:
- Registry scanning (registry_scan_box.h)
- TLS management (tls_management_box.h)
- Cache operations (unified_cache_policy_box.h)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-04 23:39:02 +09:00 |
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