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Linux Kernel Lowmem Pressure Issues and Related Kernel Structures (Doc ID 452326.1)

Last updated on MAY 06, 2021

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Linux x86
Linux x86-64
Linux Kernel - Version: 2.4 to 2.6


Purpose

This document aims to assist Linux administrators working on LowMem area (Normal Zone) pressure issues.

Scope

This document applies only to LowMem issues, and NOT for other memory issues. Although LowMem exists on 64-bit systems, issues are encountered on 32-bit systems.

* * * ATTENTION * * *

The information in this document is highly technical and are intended for technical personnel that has a good understanding of operating systems in general and the Linux kernel in specific.

Details

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In this Document
Purpose
Scope
 * * * ATTENTION * * *
Details
 What is LowMem?
 Kernel Structure Types
 The Buddy System Algorithm
 The SLAB Allocator
 Kernel Structures per Purpose
 Common Symptoms of LowMem Pressure
 Troubleshooting LowMem Pressure Problems
References

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