Bug 2232072 - THPs cause huge RSS due to thread start timing issue
Summary: THPs cause huge RSS due to thread start timing issue
Keywords:
Status: NEW
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: java-11-openjdk
Version: 8.2
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: Thomas Stuefe
QA Contact: OpenJDK QA
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-08-15 07:25 UTC by kazuhiro kawana
Modified: 2023-08-15 08:17 UTC (History)
2 users (show)

Fixed In Version:
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Type: Bug
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System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-165811 0 None None None 2023-08-15 07:37:23 UTC

Description kazuhiro kawana 2023-08-15 07:25:26 UTC 
### Description of problem:
If THP (Transparent Huge Pages) are enabled unconditionally on the system, java applications that use many threads may see a huge Resident Set Size. That footprint is caused by thread stacks being mostly paged in. 

The issue was reported in JDK bug database and already fixed:

THPs cause huge RSS due to thread start timing issue
https://bugs.openjdk.org/browse/JDK-8312182

We checked source code in src rpm, it looks OpenJDK 11(latest)  and OpenJDK 17 does not contain the above fix. 
Please a backport the fix.

### Version-Release number of selected component (if applicable):

java-11-openjdk-11.0.20.0.8-3.el8
java-17-openjdk-17.0.8.0.7-2.el8


### How reproducible:

Anytime

### Steps to Reproduce:

N/A

### Actual results:

N/A

### Expected results:
If enabling them "always", it can not lead to huge memory footprint and bad startup performance
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