[jdk21u] RFR: 8310233: Fix THP detection on Linux

[Thomas Stuefe]

On Tue, 15 Aug 2023 09:22:23 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Hi all,
> 
> This patch is one in a small line of preparatory patches that aim, ultimately, to fix https://bugs.openjdk.org/browse/JDK-8312182 ("THPs cause huge RSS due to thread start timing issue").
> 
>     This pull request contains a backport of commit [37ca9024](https://github.com/openjdk/jdk/commit/37ca9024ef59d99cae0bd7e25b2e6d3c1e085f97) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
>     The commit being backported was authored by Thomas Stuefe on 17 Jul 2023 and was reviewed by Johan Sjölen and David Holmes.
> 
>     Thanks!

got fix approval.

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PR Comment: https://git.openjdk.org/jdk21u/pull/60#issuecomment-1691040833