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MID-V3: Specialize to 257-768B, exclude C7 (ULTRA handles 1KB)

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Role separation based on ultrathink analysis:
- MID v3: 257-768B専用 (C6 only, HAKMEM_MID_V3_CLASSES=0x40)
- C7 ULTRA: 769-1024B専用 (existing optimized path)

Changes:
- core/box/hak_alloc_api.inc.h: Remove C7 route, restrict to 257-768B
- core/box/mid_hotbox_v3_env_box.h: Update ENV comments
- docs/analysis/MID_POOL_V3_DESIGN.md: Add performance results & role
- CURRENT_TASK.md: Document MID-V3 completion & role separation

Verified:
- 257-768B with v3 ON: 1,199,526 ops/s (+1.7% vs baseline)
- 769-1024B with v3 ON: 1,181,254 ops/s (same as baseline, C7 excluded)
- C7 correctly routes to ULTRA instead of MID v3

Rationale: C7-only showed -11% regression, but C6/mixed showed +11-19%
improvement. Specializing to mid-range (257-768B) leverages v3 strengths
while keeping C7 on the proven ULTRA path.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Moe Charm (CI)
2025-12-12 01:14:13 +09:00
parent 7bb179df6c
commit a8d0ab06fc
4 changed files with 63 additions and 11 deletions
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15
docs/analysis/MID_POOL_V3_DESIGN.md
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@ -4,6 +4,8 @@
Mid/Pool v3 は既存の SmallObject v4 (MF2) を発展させ、RegionIdBox による ptr→page_meta O(1) lookup を統合した次世代アーキテクチャ。
**役割分担**: MID v3 は 257-768B 専用、C7 ULTRA が 769-1024B を担当。
## Phase Plan
| Phase | 内容 | 依存 |
@ -237,10 +239,21 @@ void mid_hot_v3_free(void* ptr) {
```
HAKMEM_MID_V3_ENABLED=1 # Enable MID v3 (default: 0)
HAKMEM_MID_V3_CLASSES=0xFF # Class bitmask (default: 0xFF = all)
HAKMEM_MID_V3_CLASSES=0x40 # Class bitmask (default: 0, recommended: 0x40 = C6 only)
# NOTE: C7 (0x80) NOT recommended - use C7 ULTRA instead
HAKMEM_MID_V3_DEBUG=1 # Debug logging (default: 0)
HAKMEM_MID_V3_LANE_BATCH=16 # Lane refill batch size (default: 16)
```
## Performance Results
| Workload | Baseline (ops/s) | MID v3 ON (ops/s) | Improvement |
|----------|------------------|-------------------|-------------|
| C6 (257-768B) | 1,043,379 | 1,159,390 | **+11.1%** |
| Mixed (257-768B) | 976,057 | 1,169,648 | **+19.8%** |
**Note**: C7 (769-1024B) is intentionally excluded from MID v3 and handled by C7 ULTRA, which shows better performance for 1KB allocations.
## Checklist
- [ ] MID-V3-1: 型スケルトン + ENV