Don’t Claim Linux Memory‑Tuning Skills Without Mastering Memory Compaction

This article explains Linux memory compaction—from its core principles and page‑migration mechanics to the different compaction strategies, trigger conditions, practical test cases, and optimization tips—showing how proper compaction resolves fragmentation, improves allocation success, and boosts overall system performance.

LinuxMemory CompactionMemory Fragmentation

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Don’t Claim Linux Memory‑Tuning Skills Without Mastering Memory Compaction

OPPO Kernel Craftsman

Nov 10, 2023 · Operations

Memory Compaction in the Linux Kernel: Mechanisms, Strategies, and Implementation Details

Linux’s memory compaction mitigates external fragmentation by moving movable pages, employing four strategies—direct, passive (kcompactd), proactive, and active—each invoking the compact_zone core with configurable compact_control parameters, migrate‑page and free‑page scanners, and distinct trigger and exit conditions.

Linux kernelMemory CompactionMemory Fragmentation

0 likes · 45 min read

Memory Compaction in the Linux Kernel: Mechanisms, Strategies, and Implementation Details