8330523: Reduce runtime and improve efficiency of KeepAliveTest

[RealCLanger]

Hi all,

This pull request contains a backport of JDK-8330523, commit 98038b3d from the openjdk/jdk17u-dev repository.

The commit being backported was authored by Christoph Langer on 16 May 2024 and was reviewed by Matthias Baesken.

Thanks!

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Progress

• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8330523 needs maintainer approval

Issue

• JDK-8330523: Reduce runtime and improve efficiency of KeepAliveTest (Bug - P4 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev.git pull/2888/head:pull/2888
$ git checkout pull/2888

Update a local copy of the PR:
$ git checkout pull/2888
$ git pull https://git.openjdk.org/jdk11u-dev.git pull/2888/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2888

View PR using the GUI difftool:
$ git pr show -t 2888

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/2888.diff

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