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ccf604778c
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Front-Direct implementation: SS→FC direct refill + SLL complete bypass
## Summary
Implemented Front-Direct architecture with complete SLL bypass:
- Direct SuperSlab → FastCache refill (1-hop, bypasses SLL)
- SLL-free allocation/free paths when Front-Direct enabled
- Legacy path sealing (SLL inline opt-in, SFC cascade ENV-only)
## New Modules
- core/refill/ss_refill_fc.h (236 lines): Standard SS→FC refill entry point
- Remote drain → Freelist → Carve priority
- Header restoration for C1-C6 (NOT C0/C7)
- ENV: HAKMEM_TINY_P0_DRAIN_THRESH, HAKMEM_TINY_P0_NO_DRAIN
- core/front/fast_cache.h: FastCache (L1) type definition
- core/front/quick_slot.h: QuickSlot (L0) type definition
## Allocation Path (core/tiny_alloc_fast.inc.h)
- Added s_front_direct_alloc TLS flag (lazy ENV check)
- SLL pop guarded by: g_tls_sll_enable && !s_front_direct_alloc
- Refill dispatch:
- Front-Direct: ss_refill_fc_fill() → fastcache_pop() (1-hop)
- Legacy: sll_refill_batch_from_ss() → SLL → FC (2-hop, A/B only)
- SLL inline pop sealed (requires HAKMEM_TINY_INLINE_SLL=1 opt-in)
## Free Path (core/hakmem_tiny_free.inc, core/hakmem_tiny_fastcache.inc.h)
- FC priority: Try fastcache_push() first (same-thread free)
- tiny_fast_push() bypass: Returns 0 when s_front_direct_free || !g_tls_sll_enable
- Fallback: Magazine/slow path (safe, bypasses SLL)
## Legacy Sealing
- SFC cascade: Default OFF (ENV-only via HAKMEM_TINY_SFC_CASCADE=1)
- Deleted: core/hakmem_tiny_free.inc.bak, core/pool_refill_legacy.c.bak
- Documentation: ss_refill_fc_fill() promoted as CANONICAL refill entry
## ENV Controls
- HAKMEM_TINY_FRONT_DIRECT=1: Enable Front-Direct (SS→FC direct)
- HAKMEM_TINY_P0_DIRECT_FC_ALL=1: Same as above (alt name)
- HAKMEM_TINY_REFILL_BATCH=1: Enable batch refill (also enables Front-Direct)
- HAKMEM_TINY_SFC_CASCADE=1: Enable SFC cascade (default OFF)
- HAKMEM_TINY_INLINE_SLL=1: Enable inline SLL pop (default OFF, requires AGGRESSIVE_INLINE)
## Benchmarks (Front-Direct Enabled)
```bash
ENV: HAKMEM_BENCH_FAST_FRONT=1 HAKMEM_TINY_FRONT_DIRECT=1
HAKMEM_TINY_REFILL_BATCH=1 HAKMEM_TINY_P0_DIRECT_FC_ALL=1
HAKMEM_TINY_REFILL_COUNT_HOT=256 HAKMEM_TINY_REFILL_COUNT_MID=96
HAKMEM_TINY_BUMP_CHUNK=256
bench_random_mixed (16-1040B random, 200K iter):
256 slots: 1.44M ops/s (STABLE, 0 SEGV)
128 slots: 1.44M ops/s (STABLE, 0 SEGV)
bench_fixed_size (fixed size, 200K iter):
256B: 4.06M ops/s (has debug logs, expected >10M without logs)
128B: Similar (debug logs affect)
```
## Verification
- TRACE_RING test (10K iter): **0 SLL events** detected ✅
- Complete SLL bypass confirmed when Front-Direct=1
- Stable execution: 200K iterations × multiple sizes, 0 SEGV
## Next Steps
- Disable debug logs in hak_alloc_api.inc.h (call_num 14250-14280 range)
- Re-benchmark with clean Release build (target: 10-15M ops/s)
- 128/256B shortcut path optimization (FC hit rate improvement)
Co-Authored-By: ChatGPT <chatgpt@openai.com>
Suggested-By: ultrathink
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2025-11-14 05:41:49 +09:00 |
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1da8754d45
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CRITICAL FIX: TLS 未初期化による 4T SEGV を完全解消
**問題:**
- Larson 4T で 100% SEGV (1T は 2.09M ops/s で完走)
- System/mimalloc は 4T で 33.52M ops/s 正常動作
- SS OFF + Remote OFF でも 4T で SEGV
**根本原因: (Task agent ultrathink 調査結果)**
```
CRASH: mov (%r15),%r13
R15 = 0x6261 ← ASCII "ba" (ゴミ値、未初期化TLS)
```
Worker スレッドの TLS 変数が未初期化:
- `__thread void* g_tls_sll_head[TINY_NUM_CLASSES];` ← 初期化なし
- pthread_create() で生成されたスレッドでゼロ初期化されない
- NULL チェックが通過 (0x6261 != NULL) → dereference → SEGV
**修正内容:**
全 TLS 配列に明示的初期化子 `= {0}` を追加:
1. **core/hakmem_tiny.c:**
- `g_tls_sll_head[TINY_NUM_CLASSES] = {0}`
- `g_tls_sll_count[TINY_NUM_CLASSES] = {0}`
- `g_tls_live_ss[TINY_NUM_CLASSES] = {0}`
- `g_tls_bcur[TINY_NUM_CLASSES] = {0}`
- `g_tls_bend[TINY_NUM_CLASSES] = {0}`
2. **core/tiny_fastcache.c:**
- `g_tiny_fast_cache[TINY_FAST_CLASS_COUNT] = {0}`
- `g_tiny_fast_count[TINY_FAST_CLASS_COUNT] = {0}`
- `g_tiny_fast_free_head[TINY_FAST_CLASS_COUNT] = {0}`
- `g_tiny_fast_free_count[TINY_FAST_CLASS_COUNT] = {0}`
3. **core/hakmem_tiny_magazine.c:**
- `g_tls_mags[TINY_NUM_CLASSES] = {0}`
4. **core/tiny_sticky.c:**
- `g_tls_sticky_ss[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
- `g_tls_sticky_idx[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
- `g_tls_sticky_pos[TINY_NUM_CLASSES] = {0}`
**効果:**
```
Before: 1T: 2.09M ✅ | 4T: SEGV 💀
After: 1T: 2.41M ✅ | 4T: 4.19M ✅ (+15% 1T, SEGV解消)
```
**テスト:**
```bash
# 1 thread: 完走
./larson_hakmem 2 8 128 1024 1 12345 1
→ Throughput = 2,407,597 ops/s ✅
# 4 threads: 完走（以前は SEGV）
./larson_hakmem 2 8 128 1024 1 12345 4
→ Throughput = 4,192,155 ops/s ✅
```
**調査協力:** Task agent (ultrathink mode) による完璧な根本原因特定
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-07 01:27:04 +09:00 |
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52386401b3
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Debug Counters Implementation - Clean History
Major Features:
- Debug counter infrastructure for Refill Stage tracking
- Free Pipeline counters (ss_local, ss_remote, tls_sll)
- Diagnostic counters for early return analysis
- Unified larson.sh benchmark runner with profiles
- Phase 6-3 regression analysis documentation
Bug Fixes:
- Fix SuperSlab disabled by default (HAKMEM_TINY_USE_SUPERSLAB)
- Fix profile variable naming consistency
- Add .gitignore patterns for large files
Performance:
- Phase 6-3: 4.79 M ops/s (has OOM risk)
- With SuperSlab: 3.13 M ops/s (+19% improvement)
This is a clean repository without large log files.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-05 12:31:14 +09:00 |
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