Oracle Linux: Kernel Lowmem Pressure Issues and Related Kernel Structures
(Doc ID 452326.1)
Last updated on OCTOBER 11, 2022
Applies to:
Oracle Database Cloud Schema Service - Version N/A and laterOracle 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 x86-64
Linux x86
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.
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 |