Linux Code Review Hub

Sep 6, 2025 · Fundamentals

From xarray to Swap Table: Redesigning Linux Swapcache for Speed and Simplicity

The article analyzes the new swap table implementation that replaces the kernel's xarray‑based swapcache with a per‑cluster array, offering O(1) lookups, reduced lock contention, lower memory overhead, and measurable performance gains demonstrated by real‑world benchmarks.