Why Does Linux Need Swapping? Uncovering Memory Management Mechanics

This article explains Linux's swapping mechanism, detailing how the kernel moves rarely used memory pages to disk to handle memory shortage and idle memory, the underlying allocation paths, key parameters, and the trade‑offs involved for system performance and stability.

SwappingVirtual Memorymemory-management

0 likes · 11 min read

Why Does Linux Need Swapping? Uncovering Memory Management Mechanics

Liangxu Linux

Nov 29, 2020 · Fundamentals

Why Does Linux Need Swapping? Understanding Memory Pressure and Idle Page Management

Linux uses swapping to move rarely used memory pages to disk, alleviating memory pressure and reclaiming idle memory, but the performance impact of disk I/O can cause latency; this article explains the mechanisms, triggers, and kernel functions behind swapping, including direct reclaim, kswapd, and LRU lists.

LinuxSwappingkernel

0 likes · 11 min read

Why Does Linux Need Swapping? Understanding Memory Pressure and Idle Page Management