hakmem/core/box/free_local_box.h

// free_local_box.h - Box: Same-thread free to freelist (first-free publishes)
#pragma once
#include <stdint.h>
#include "hakmem_tiny_superslab.h"

// Perform same-thread freelist push. On first-free (prev==NULL), publishes via Ready/Mailbox.
// Returns: 1 if slab transitioned to EMPTY (used=0), 0 otherwise.
int tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void* ptr, uint32_t my_tid);
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> 2025-11-07 01:27:04 +09:00			`// free_local_box.h - Box: Same-thread free to freelist (first-free publishes)`
			`#pragma once`
			`#include <stdint.h>`
			`#include "hakmem_tiny_superslab.h"`

			`// Perform same-thread freelist push. On first-free (prev==NULL), publishes via Ready/Mailbox.`
Phase 9-2: Remove Legacy Backend & Unify to Shared Pool (50M ops/s) - Removed Legacy Backend fallback; Shared Pool is now the sole backend. - Removed Soft Cap limit in Shared Pool to allow full memory management. - Implemented EMPTY slab recycling with batched meta->used decrement in remote drain. - Updated tiny_free_local_box to return is_empty status for safe recycling. - Fixed race condition in release path by removing from legacy list early. - Achieved 50.3M ops/s in WS8192 benchmark (+200% vs baseline). 2025-12-01 13:47:23 +09:00			`// Returns: 1 if slab transitioned to EMPTY (used=0), 0 otherwise.`
			`int tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void* ptr, uint32_t my_tid);`
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> 2025-11-07 01:27:04 +09:00