Issue:
- Drain was detecting meta->used==0 but not releasing slabs
- Logic missing: shared_pool_release_slab() call after empty detection
- Result: SuperSlabs not freed, LRU cache not populated
Fix:
- Added shared_pool_release_slab() call when meta->used==0 (line 194)
- Mirrors logic in tiny_superslab_free.inc.h:223-236
- Empty slabs now released to shared pool
Performance Impact (ws=4096, 200K iterations):
- Before (baseline): 563K ops/s
- After this fix: 5.9M ops/s (+950% improvement!)
Note: LRU cache still not populated (investigating next)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
4ffdaae2fc