Tencent Database Technology
May 17, 2018 · Operations
Analysis of ext4 Soft Lockup Caused by Extent Status LRU Lock Contention in Linux 3.10
This article examines a Linux 3.10 kernel soft‑lockup bug where the ext4 extent‑status LRU spin‑lock is held for over 20 seconds under memory pressure, explains the ext4 delayed‑allocation mechanism, block lookup process, extent‑status cache shrinkage, and presents the community's mitigation approach.
LRU spin lockLinux kernelext4
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