Alibaba Cloud Infrastructure

Aug 25, 2025 · Operations

Why Linux Skips OOM at High Memory? Meet FastOOM to Stop Near‑OOM Jitters

When memory usage approaches 90‑95% of capacity, Linux often raises CPU load and stalls instead of invoking OOM, but Alibaba Cloud's FastOOM adds proactive user‑space killing to prevent Near‑OOM livelocks and keep services responsive.