hakmem/hakmem_smallmid.d

hakmem_smallmid.o: core/hakmem_smallmid.c core/hakmem_smallmid.h
core/hakmem_smallmid.h:
Add Page Box layer for C7 class optimization - Implement tiny_page_box.c/h: per-thread page cache between UC and Shared Pool - Integrate Page Box into Unified Cache refill path - Remove legacy SuperSlab implementation (merged into smallmid) - Add HAKMEM_TINY_PAGE_BOX_CLASSES env var for selective class enabling - Update bench_random_mixed.c with Page Box statistics Current status: Implementation safe, no regressions. Page Box ON/OFF shows minimal difference - pool strategy needs tuning. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> 2025-12-05 15:31:44 +09:00			`hakmem_smallmid.o: core/hakmem_smallmid.c core/hakmem_smallmid.h`
Phase 17-1: Small-Mid Allocator - TLS Frontend Cache (結果: ±0.3%, 層分離成功) Summary: ======== Phase 17-1 implements Small-Mid allocator as TLS frontend cache with Tiny backend delegation. Result: Clean layer separation achieved with minimal overhead (±0.3%), but no performance gain. Conclusion: Frontend-only approach is dead end. Phase 17-2 (dedicated backend) required for 2-3x target. Implementation: =============== 1. Small-Mid TLS frontend (256B/512B/1KB - 3 classes) - TLS freelist (32/24/16 capacity) - Backend delegation to Tiny C5/C6/C7 - Header conversion (0xa0 → 0xb0) 2. Auto-adjust Tiny boundary - When Small-Mid ON: Tiny auto-limits to C0-C5 (0-255B) - When Small-Mid OFF: Tiny default C0-C7 (0-1023B) - Prevents routing conflict 3. Routing order fix - Small-Mid BEFORE Tiny (critical for proper execution) - Fall-through on TLS miss Files Modified: =============== - core/hakmem_smallmid.h/c: TLS freelist + backend delegation - core/hakmem_tiny.c: tiny_get_max_size() auto-adjust - core/box/hak_alloc_api.inc.h: Routing order (Small-Mid → Tiny) - CURRENT_TASK.md: Phase 17-1 results + Phase 17-2 plan A/B Benchmark Results: ====================== \| Size \| Config A (OFF) \| Config B (ON) \| Delta \| % Change \| \|--------\|----------------\|---------------\|----------\|----------\| \| 256B \| 5.87M ops/s \| 6.06M ops/s \| +191K \| +3.3% \| \| 512B \| 6.02M ops/s \| 5.91M ops/s \| -112K \| -1.9% \| \| 1024B \| 5.58M ops/s \| 5.54M ops/s \| -35K \| -0.6% \| \| Overall\| 5.82M ops/s \| 5.84M ops/s \| +20K \| +0.3% \| Analysis: ========= ✅ SUCCESS: Clean layer separation (Small-Mid ↔ Tiny coexist) ✅ SUCCESS: Minimal overhead (±0.3% = measurement noise) ❌ FAIL: No performance gain (target was 2-4x) Root Cause: ----------- - Delegation overhead = TLS savings (net gain ≈ 0 instructions) - Small-Mid TLS alloc: ~3-5 instructions - Tiny backend delegation: ~3-5 instructions - Header conversion: ~2 instructions - No batching: 1:1 delegation to Tiny (no refill amortization) Lessons Learned: ================ - Frontend-only approach ineffective (backend calls not reduced) - Dedicated backend essential for meaningful improvement - Clean separation achieved = solid foundation for Phase 17-2 Next Steps (Phase 17-2): ======================== - Dedicated Small-Mid SuperSlab backend (separate from Tiny) - TLS batch refill (8-16 blocks per refill) - Optimized 0xb0 header fast path (no delegation) - Target: 12-15M ops/s (2.0-2.6x improvement) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> 2025-11-16 02:37:24 +09:00			`core/hakmem_smallmid.h:`