RFR: 8364927: Move SmapsParser from runtime/os/TestTracePageSizes.java into testlib

[jonghoonpark]

On Sun, 14 Sep 2025 08:35:53 GMT, jonghoonpark <duke at openjdk.org> wrote:

> related jira issue: https://bugs.openjdk.org/browse/JDK-8366716
> 
> ---
> 
> Following the direction outlined in the issue description,
> I've extracted the common parts from `TestTracePageSizes` and `TestTransparentHugePagesHeap` to implement the `SmapsParser` test library.
> 
> I've confirmed that it works without issues in my local tests.
> 
> Reviews and feedback are welcome.

I converted this PR to a draft due to changes in https://github.com/openjdk/jdk/pull/27143

have confirmed that both `TestTracePageSizes` and `TestTransparentHugePagesHeap` pass when tested locally.

Additionally, I verified that `TestTransparentHugePagesHeap` also passes without any issues when the `-XX:+UseCompressedOops` option is added, as shown below:


OutputAnalyzer oa = ProcessTools.executeTestJava("-XX:+Use" + args[0] + "GC", "-Xmx128m", "-Xms128m", "-Xlog:pagesize:thp-%p.log", "-XX:+UseTransparentHugePages", "-XX:+UseCompressedOops", VerifyTHPEnabledForHeap.class.getName());


Is this the correct way to verify it?

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PR Comment: https://git.openjdk.org/jdk/pull/27273#issuecomment-3289363658
PR Comment: https://git.openjdk.org/jdk/pull/27273#issuecomment-3289408042