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deecda7336
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Phase 3 C2: Slab Metadata Cache Optimization (3 patches) - NEUTRAL
Patch 1: Policy Hot Cache
- Add TinyPolicyHot struct (route_kind[8] cached in TLS)
- Eliminate policy_snapshot() calls (~2 memory ops saved)
- Safety: disabled when learner v7 active
- Files: tiny_metadata_cache_env_box.h, tiny_metadata_cache_hot_box.{h,c}
- Integration: malloc_tiny_fast.h route selection
Patch 2: First Page Inline Cache
- Cache current slab page pointer in TLS per-class
- Avoid superslab metadata lookup (1-2 memory ops)
- Fast-path in tiny_legacy_fallback_free_base()
- Files: tiny_first_page_cache.h, tiny_unified_cache.c
- Integration: tiny_legacy_fallback_box.h
Patch 3: Bounds Check Compile-out
- Hardcode unified_cache capacity as MACRO constant
- Eliminate modulo operation (constant fold)
- Macros: TINY_UNIFIED_CACHE_CAPACITY_POW2=11, CAPACITY=2048, MASK=2047
- File: tiny_unified_cache.h
A/B Test Results (Mixed, 10-run):
- Baseline (C2=0): 40.43M ops/s (avg), 40.72M ops/s (median)
- Optimized (C2=1): 40.25M ops/s (avg), 40.29M ops/s (median)
- Improvement: -0.45% (avg), -1.06% (median)
- DECISION: NEUTRAL (within ±1.0% threshold)
- Action: Keep as research box (ENV gate OFF by default)
Cumulative Gain (Phase 2-3):
- B3 (Routing shape): +2.89%
- B4 (Wrapper split): +1.47%
- C3 (Static routing): +2.20%
- C2 (Metadata cache): -0.45%
- Total: ~6.1% (from baseline 37.5M → 39.8M ops/s)
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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2025-12-13 19:19:42 +09:00 |
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0752688785
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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>
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2025-12-11 19:01:59 +09:00 |
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