How TencentOS Engineers Revamped Linux Swap for 5‑20% Performance Gains

This article translates and consolidates three LWN analyses of the Linux swap subsystem modernization led by TencentOS kernel engineer Kairui Song, detailing the introduction of swap tables, removal of the swap map, virtual swap concepts, code changes, performance improvements of up to 20 % and the broader impact on the kernel community.

Linux kernelMemory ManagementPerformance Optimization

0 likes · 27 min read

How TencentOS Engineers Revamped Linux Swap for 5‑20% Performance Gains

Tencent Architect

Apr 2, 2026 · Operations

How Modernizing Linux Swap Boosts Performance and Cuts Memory Overhead

This article translates and consolidates Jonathan Corbet’s three-part “Modernizing swapping” series, detailing the introduction of swap tables, removal of swap maps, and virtual swap concepts that together improve Linux kernel swap performance by up to 20%, reduce metadata memory by up to 30%, and simplify the codebase.

Linux kernelPerformance Optimizationswap map

0 likes · 27 min read

How Modernizing Linux Swap Boosts Performance and Cuts Memory Overhead

Linux Kernel Journey

Sep 6, 2025 · Fundamentals

From xarray to Swap Table: Streamlining Linux Swapcache Management

The article analyzes how the newly introduced swap table replaces the kernel's xarray for swapcache, offering O(1) lookups, better locality, reduced lock contention, and lower memory overhead, with benchmark results showing notable performance gains in real workloads.

Linux kernelMemory Managementswap table

0 likes · 11 min read

From xarray to Swap Table: Streamlining Linux Swapcache Management

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.

Linux kernelMemory ManagementPerformance

0 likes · 11 min read

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