HugePages Not Released On Oracle RDBMS Instance Shutdown with RHEL / EL 5 Update 1 (5.1) (Doc ID 550443.1)

Last updated on MAY 13, 2013

Applies to:

Linux OS - Version: 5.1 to 5.1 - Release: OEL5U1 to OEL5U1
Linux x86-64
Linux Kernel - Version: 5.1 to 5.1
***Checked for relevance on 11-Jun-2010***

Symptoms

-- Problem Statement:
After installing RHEL or EL 5.1, "hugepages" leaks memory.

-- Steps To Reproduce:
Implement hugepages as in <>
Shutdown Oracle instance - not all hugepages are released:
- approximately 31 hugepages are "leaked" if init.ora parameter pre_page_sga=false
- all hugepages are "leaked" if init.ora parameter pre_page_sga=true

-- Business Impact:
Reboot is required to release the hugepages - disrupts other services runing on the system.
Re-starting an instance fails to acquire hugepages, SGA memory is allocated out of "normal" memory
leading to extreme performance issues.

Changes

Problem did not occur in RHEL / EL 5.0

Cause

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