Tagged articles

shmem

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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.

Linux kernelTencentOScloud-native

0 likes · 31 min read

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

OPPO Kernel Craftsman

Feb 2, 2024 · Fundamentals

Linux Shared Memory (shmem) Deep Dive: Architecture, Implementation, and Practice

Linux’s shmem subsystem provides hybrid anonymous/file‑backed pages that enable diverse shared‑memory scenarios—parent‑child communication, IPC, tmpfs, Android ashmem, and memfd—by using APIs such as shmem_file_setup, handling page faults through cache and swap mechanisms, and employing a specialized reclamation process to manage memory efficiently.

Linux kernelVirtual Memorymemfd

0 likes · 10 min read

Linux Shared Memory (shmem) Deep Dive: Architecture, Implementation, and Practice