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Author SHA1 Message Date
Moe Charm (CI)
1e04debb1b Phase v6-5: C5 extension for SmallObject Core v6 
Extend v6 architecture to support C5 (129-256B) in addition to C6 (257-512B):

- SmallHeapCtxV6: Add tls_freelist_c5[32] and tls_count_c5 for C5 TLS cache
- smallsegment_v6_box.h: Add SMALL_V6_C5_CLASS_IDX (5) and C5_BLOCK_SIZE (256)
- smallobject_cold_iface_v6.c: Generalize refill_page for both C5 (256 blocks/page)
  and C6 (128 blocks/page)
- smallobject_core_v6.c: Add C5 fast path (alloc/free) with TLS batching

Performance (v6 C5 enabled):
- C5-heavy: 41.0M ops/s (-23% vs v6 OFF 53.6M) - needs optimization
- Mixed: 36.2M ops/s (-18% vs v6 OFF 44.0M) - functional baseline

Note: C5 route requires optimization in next phase to match v6-3 performance.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-11 15:50:14 +09:00
Moe Charm (CI)
c60199182e Phase v6-1/2/3/4: SmallObject Core v6 - C6-only implementation + refactor 
Phase v6-1: C6-only route stub (v1/pool fallback)
Phase v6-2: Segment v6 + ColdIface v6 + Core v6 HotPath implementation
  - 2MiB segment / 64KiB page allocation
  - O(1) ptr→page_meta lookup with segment masking
  - C6-heavy A/B: SEGV-free but -44% performance (15.3M ops/s)

Phase v6-3: Thin-layer optimization (TLS ownership check + batch header + refill batching)
  - TLS ownership fast-path skip page_meta for 90%+ of frees
  - Batch header writes during refill (32 allocs = 1 header write)
  - TLS batch refill (1/32 refill frequency)
  - C6-heavy A/B: v6-2 15.3M → v6-3 27.1M ops/s (±0% vs baseline) ✅

Phase v6-4: Mixed hang fix (segment metadata lookup correction)
  - Root cause: metadata lookup was reading mmap region instead of TLS slot
  - Fix: use TLS slot descriptor with in_use validation
  - Mixed health: 5M iterations SEGV-free, 35.8M ops/s ✅

Phase v6-refactor: Code quality improvements (macro unification + inline + docs)
  - Add SMALL_V6_* prefix macros (header, pointer conversion, page index)
  - Extract inline validation functions (small_page_v6_valid, small_ptr_in_segment_v6)
  - Doxygen-style comments for all public functions
  - Result: 0 compiler warnings, maintained +1.2% performance

Files:
- core/box/smallobject_core_v6_box.h (new, type & API definitions)
- core/box/smallobject_cold_iface_v6.h (new, cold iface API)
- core/box/smallsegment_v6_box.h (new, segment type definitions)
- core/smallobject_core_v6.c (new, C6 alloc/free implementation)
- core/smallobject_cold_iface_v6.c (new, refill/retire logic)
- core/smallsegment_v6.c (new, segment allocator)
- docs/analysis/SMALLOBJECT_CORE_V6_DESIGN.md (new, design document)
- core/box/tiny_route_env_box.h (modified, v6 route added)
- core/front/malloc_tiny_fast.h (modified, v6 case in route switch)
- Makefile (modified, v6 objects added)
- CURRENT_TASK.md (modified, v6 status added)

Status:
- C6-heavy: v6 OFF 27.1M → v6-3 ON 27.1M ops/s (±0%) ✅
- Mixed: v6 ON 35.8M ops/s (C6-only, other classes via v1) ✅
- Build: 0 warnings, fully documented ✅

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-11 15:29:59 +09:00