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a78224123e
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Fix C0/C7 class confusion: Upgrade C7 stride to 2048B and fix meta->class_idx initialization
Root Cause:
1. C7 stride was 1024B, unable to serve 1024B user requests (need 1025B with header)
2. New SuperSlabs start with meta->class_idx=0 (mmap zero-init)
3. superslab_init_slab() only sets class_idx if meta->class_idx==255
4. Multiple code paths used conditional assignment (if class_idx==255), leaving C7 slabs with class_idx=0
5. This caused C7 blocks to be misidentified as C0, leading to HDR_META_MISMATCH errors
Changes:
1. Upgrade C7 stride: 1024B → 2048B (can now serve 1024B requests)
2. Update blocks_per_slab[7]: 64 → 32 (2048B stride / 64KB slab)
3. Update size-to-class LUT: entries 513-2048 now map to C7
4. Fix superslab_init_slab() fail-safe: only reinitialize if class_idx==255 (not 0)
5. Add explicit class_idx assignment in 6 initialization paths:
- tiny_superslab_alloc.inc.h: superslab_refill() after init
- hakmem_tiny_superslab.c: backend_shared after init (main path)
- ss_unified_backend_box.c: unconditional assignment
- ss_legacy_backend_box.c: explicit assignment
- superslab_expansion_box.c: explicit assignment
- ss_allocation_box.c: fail-safe condition fix
Fix P0 refill bug:
- Update obsolete array access after Phase 3d-B TLS SLL unification
- g_tls_sll_head[cls] → g_tls_sll[cls].head
- g_tls_sll_count[cls] → g_tls_sll[cls].count
Results:
- HDR_META_MISMATCH: eliminated (0 errors in 100K iterations)
- 1024B allocations now routed to C7 (Tiny fast path)
- NXT_MISALIGN warnings remain (legacy 1024B SuperSlabs, separate issue)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-21 13:44:05 +09:00 |
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38552c3f39
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Phase 3d-A: SlabMeta Box boundary - Encapsulate SuperSlab metadata access
ChatGPT-guided Box theory refactoring (Phase A: Boundary only).
Changes:
- Created ss_slab_meta_box.h with 15 inline accessor functions
- HOT fields (8): freelist, used, capacity (fast path)
- COLD fields (6): class_idx, carved, owner_tid_low (init/debug)
- Legacy (1): ss_slab_meta_ptr() for atomic ops
- Migrated 14 direct slabs[] access sites across 6 files
- hakmem_shared_pool.c (4 sites)
- tiny_free_fast_v2.inc.h (1 site)
- hakmem_tiny.c (3 sites)
- external_guard_box.h (1 site)
- hakmem_tiny_lifecycle.inc (1 site)
- ss_allocation_box.c (4 sites)
Architecture:
- Zero overhead (static inline wrappers)
- Single point of change for future layout optimizations
- Enables Hot/Cold split (Phase C) without touching call sites
- A/B testing support via compile-time flags
Verification:
- Build: ✅ Success (no errors)
- Stability: ✅ All sizes pass (128B-1KB, 22-24M ops/s)
- Behavior: Unchanged (thin wrapper, no logic changes)
Next: Phase B (TLS Cache Merge, +12-18% expected)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-20 02:01:52 +09:00 |
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