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17ceed619c65ec206a41ba6b808ccf9a6b1f0029
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3 Commits

Author SHA1 Message Date
Moe Charm (CI)
17ceed619c Phase v7-5a: Hot path stats removal (C6 v7 極限最適化) 
- Remove per-page stats from hot path (alloc_count, free_count, live_current)
- Add ENV-gated global atomic stats (HAKMEM_V7_HOT_STATS)
- Stats now collected only at retire time (cold path)
- Header write kept at alloc time (freelist overlaps block[0])

A/B Result: -4.3% overhead → ±0% (target: legacy ±2%)
v7 OFF avg: 9.26M ops/s, v7 ON avg: 9.27M ops/s (+0.15%)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-12 04:51:17 +09:00
Moe Charm (CI)
2bdf29a9ed Phase v7-3: TLS segment fast path optimization (RegionIdBox overhead reduction) 
- SmallHeapCtx_v7: Add TLS segment hints (tls_seg_base/end) for fast bounds check
- free fast path: TLS segment hit → skip RegionIdBox binary search
- Simplified control flow: removed same-page cache (negligible benefit vs branch cost)
- Optimization: O(1) page_idx calculation via bit shift vs O(log N) RegionIdBox lookup

Performance improvement:
- Phase v7-2: 54.5M ops/s (-7.0% vs 58.6M legacy)
- Phase v7-3: 56.3M ops/s (-4.3% vs legacy)
- Overhead reduction: 38% (from -7.0% to -4.3%)

TLS segment hit path bypasses RegionIdBox for most C6 frees.
Remaining -4.3% overhead acceptable for modular v7 architecture.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-12 03:38:39 +09:00
Moe Charm (CI)
39a3c53dbc Phase v7-2: SmallObject v7 C6-only implementation with RegionIdBox integration 
- SmallSegment_v7: 2MiB segment with TLS slot and free page stack
- ColdIface_v7: Page refill/retire between HotBox and SegmentBox
- HotBox_v7: Full C6-only alloc/free with header writing (HEADER_MAGIC|class_idx)
- Free path early-exit: Check v7 route BEFORE ss_fast_lookup (separate mmap segment)
- RegionIdBox: Register v7 segment for ptr->region lookup
- Benchmark: v7 ON ~54.5M ops/s (-7% overhead vs 58.6M legacy baseline)

v7 correctly balances alloc/free counts and page lifecycle.
RegionIdBox overhead identified as primary cost driver.

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

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-12 03:12:28 +09:00