Tencent Architect

Aug 26, 2026 · Cloud Native

Zombie Memcg Exhausting Node Memory? TencentOS's Cross-Kernel Fix

TencentOS analyzes zombie memcg root causes — page cache, shmem, and swap entries — reviews existing solutions' limitations, and proposes a dual-track approach: upstream patches for new kernels (obj_cgroup binding, swap entry fix) and a kernel module for old kernels that asynchronously reparents dying memcg pages and swap entries to online parents, preserving cache while enabling zero-restart deployment.