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hakmem/core/tiny_alloc_fast_push.d
Moe Charm (CI) 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

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core/tiny_alloc_fast_push.o: core/tiny_alloc_fast_push.c \
core/hakmem_tiny_config.h core/box/tls_sll_box.h \
core/box/../hakmem_internal.h core/box/../hakmem.h \
core/box/../hakmem_build_flags.h core/box/../hakmem_config.h \
core/box/../hakmem_features.h core/box/../hakmem_sys.h \
core/box/../hakmem_whale.h core/box/../box/ptr_type_box.h \
core/box/../hakmem_tiny_config.h core/box/../hakmem_build_flags.h \
core/box/../hakmem_debug_master.h core/box/../tiny_remote.h \
core/box/../tiny_region_id.h core/box/../tiny_box_geometry.h \
core/box/../hakmem_tiny_superslab_constants.h \
core/box/../hakmem_tiny_config.h core/box/../ptr_track.h \
core/box/../hakmem_super_registry.h core/box/../hakmem_tiny_superslab.h \
core/box/../superslab/superslab_types.h \
core/hakmem_tiny_superslab_constants.h \
core/box/../superslab/superslab_inline.h \
core/box/../superslab/superslab_types.h \
core/box/../superslab/../tiny_box_geometry.h \
core/box/../tiny_debug_ring.h core/box/../tiny_remote.h \
core/box/../box/ss_addr_map_box.h \
core/box/../box/../hakmem_build_flags.h core/box/../box/super_reg_box.h \
core/box/../box/ss_pt_lookup_box.h core/box/../box/ss_pt_types_box.h \
core/box/../box/ss_pt_env_box.h core/box/../box/ss_pt_env_box.h \
core/box/../hakmem_tiny.h core/box/../hakmem_trace.h \
core/box/../hakmem_tiny_mini_mag.h \
core/box/../box/hak_lane_classify.inc.h core/box/../tiny_debug_api.h \
core/box/../hakmem_tiny_integrity.h core/box/../ptr_track.h \
core/box/../ptr_trace.h core/box/../hakmem_trace_master.h \
core/box/../hakmem_stats_master.h core/box/../box/tiny_next_ptr_box.h \
core/hakmem_tiny_config.h core/tiny_nextptr.h core/hakmem_build_flags.h \
core/tiny_region_id.h core/superslab/superslab_inline.h \
core/box/tiny_layout_box.h core/box/tiny_header_box.h \
core/box/tiny_layout_box.h core/box/../tiny_debug_ring.h \
core/box/ss_addr_map_box.h core/box/../superslab/superslab_inline.h \
core/box/tiny_ptr_bridge_box.h \
core/box/../hakmem_tiny_superslab_internal.h \
core/box/../box/ss_hot_cold_box.h \
core/box/../box/../superslab/superslab_types.h \
core/box/../box/ss_allocation_box.h core/hakmem_tiny_superslab.h \
core/box/../hakmem_debug_master.h core/box/../hakmem_shared_pool.h \
core/box/../hakmem_internal.h core/box/../tiny_region_id.h \
core/box/../hakmem_tiny_integrity.h \
core/box/../box/slab_freelist_atomic.h core/box/tiny_header_box.h \
core/box/tiny_heap_env_box.h core/box/c7_hotpath_env_box.h \
core/box/front_gate_box.h core/hakmem_tiny.h
core/hakmem_tiny_config.h:
core/box/tls_sll_box.h:
core/box/../hakmem_internal.h:
core/box/../hakmem.h:
core/box/../hakmem_build_flags.h:
core/box/../hakmem_config.h:
core/box/../hakmem_features.h:
core/box/../hakmem_sys.h:
core/box/../hakmem_whale.h:
core/box/../box/ptr_type_box.h:
core/box/../hakmem_tiny_config.h:
core/box/../hakmem_build_flags.h:
core/box/../hakmem_debug_master.h:
core/box/../tiny_remote.h:
core/box/../tiny_region_id.h:
core/box/../tiny_box_geometry.h:
core/box/../hakmem_tiny_superslab_constants.h:
core/box/../hakmem_tiny_config.h:
core/box/../ptr_track.h:
core/box/../hakmem_super_registry.h:
core/box/../hakmem_tiny_superslab.h:
core/box/../superslab/superslab_types.h:
core/hakmem_tiny_superslab_constants.h:
core/box/../superslab/superslab_inline.h:
core/box/../superslab/superslab_types.h:
core/box/../superslab/../tiny_box_geometry.h:
core/box/../tiny_debug_ring.h:
core/box/../tiny_remote.h:
core/box/../box/ss_addr_map_box.h:
core/box/../box/../hakmem_build_flags.h:
core/box/../box/super_reg_box.h:
core/box/../box/ss_pt_lookup_box.h:
core/box/../box/ss_pt_types_box.h:
core/box/../box/ss_pt_env_box.h:
core/box/../box/ss_pt_env_box.h:
core/box/../hakmem_tiny.h:
core/box/../hakmem_trace.h:
core/box/../hakmem_tiny_mini_mag.h:
core/box/../box/hak_lane_classify.inc.h:
core/box/../tiny_debug_api.h:
core/box/../hakmem_tiny_integrity.h:
core/box/../ptr_track.h:
core/box/../ptr_trace.h:
core/box/../hakmem_trace_master.h:
core/box/../hakmem_stats_master.h:
core/box/../box/tiny_next_ptr_box.h:
core/hakmem_tiny_config.h:
core/tiny_nextptr.h:
core/hakmem_build_flags.h:
core/tiny_region_id.h:
core/superslab/superslab_inline.h:
core/box/tiny_layout_box.h:
core/box/tiny_header_box.h:
core/box/tiny_layout_box.h:
core/box/../tiny_debug_ring.h:
core/box/ss_addr_map_box.h:
core/box/../superslab/superslab_inline.h:
core/box/tiny_ptr_bridge_box.h:
core/box/../hakmem_tiny_superslab_internal.h:
core/box/../box/ss_hot_cold_box.h:
core/box/../box/../superslab/superslab_types.h:
core/box/../box/ss_allocation_box.h:
core/hakmem_tiny_superslab.h:
core/box/../hakmem_debug_master.h:
core/box/../hakmem_shared_pool.h:
core/box/../hakmem_internal.h:
core/box/../tiny_region_id.h:
core/box/../hakmem_tiny_integrity.h:
core/box/../box/slab_freelist_atomic.h:
core/box/tiny_header_box.h:
core/box/tiny_heap_env_box.h:
core/box/c7_hotpath_env_box.h:
core/box/front_gate_box.h:
core/hakmem_tiny.h:
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