1da8754d45
**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>
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
// tiny_mmap_gate.h - Mmap Gate (must-adopt-before-mmap)
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#pragma once
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#include "hakmem_tiny_superslab.h"
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#include "tiny_refill.h"
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#include "hakmem_super_registry.h"
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#include "tiny_route.h"
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// Box: adopt gate (header-only)
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#include "box/adopt_gate_box.h"
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// Returns adopted SuperSlab* or NULL
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static inline SuperSlab* tiny_must_adopt_gate(int class_idx, TinyTLSSlab* tls) {
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// Env: enable gate
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static int en = -1;
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if (__builtin_expect(en == -1, 0)) {
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const char* s = getenv("HAKMEM_TINY_MUST_ADOPT");
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en = (s && atoi(s) != 0) ? 1 : 0;
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}
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if (!en) return NULL;
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// Adaptive: require remote activity and apply cooldown on failures
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extern _Atomic int g_ss_remote_seen;
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if (atomic_load_explicit(&g_ss_remote_seen, memory_order_relaxed) == 0) {
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return NULL; // No remote traffic observed yet → skip heavy adopt path
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}
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// Cooldown (TLS per-class)
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static __thread int s_cooldown[TINY_NUM_CLASSES] = {0};
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static int s_cd_def = -1;
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if (__builtin_expect(s_cd_def == -1, 0)) {
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const char* cd = getenv("HAKMEM_TINY_SS_ADOPT_COOLDOWN");
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int v = cd ? atoi(cd) : 32; // default: 32 missesの間は休む
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if (v < 0) v = 0; if (v > 1024) v = 1024;
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s_cd_def = v;
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}
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if (s_cooldown[class_idx] > 0) {
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s_cooldown[class_idx]--;
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return NULL;
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}
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// Delegate to Box
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SuperSlab* ss = adopt_gate_try(class_idx, tls);
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if (!ss && s_cd_def > 0) {
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s_cooldown[class_idx] = s_cd_def; // backoff on miss
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}
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return ss;
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}
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