Commit Graph

2 Commits

Author SHA1 Message Date
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
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