Understanding Linux Page Reclaim: LRU, Second‑Chance, and Direct Reclaim Walkthrough

This article explains Linux's page reclamation mechanisms, covering the LRU list algorithm, the second‑chance method with PG_active and PG_referenced flags, and the direct reclaim path triggered by alloc_page, including the role of kswapd, waiting queues, and key kernel functions such as lru_cache_add, mark_page_accessed, try_to_free_pages, and throttle_direct_reclaim.

LRULinuxMemory Management

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Understanding Linux Page Reclaim: LRU, Second‑Chance, and Direct Reclaim Walkthrough

Deepin Linux

Jun 6, 2024 · Fundamentals

Linux Page Reclaim Mechanism and PFRA Design Overview

This article explains Linux's page reclamation process, describing how the kernel recovers memory under pressure using PFRA, LRU algorithms, direct reclaim, compaction, and OOM handling, and provides detailed source code analysis of the involved kernel functions.

LRULinuxPFRA

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Linux Page Reclaim Mechanism and PFRA Design Overview

Deepin Linux

Dec 9, 2023 · Fundamentals

Linux Page Reclaim Mechanism and Memory Compaction: Detailed Source Code Analysis

This article explains the Linux page‑reclaim mechanism, its goals, common techniques, the allocation paths, LRU data structures, and provides an in‑depth walkthrough of the kernel source code for slow‑path reclaim, direct reclaim, and memory compaction, including all relevant functions and code snippets.

Linuxcompactionpage reclaim

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Linux Page Reclaim Mechanism and Memory Compaction: Detailed Source Code Analysis