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

Tue Aug 15 09:28:51 UTC 2023

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!

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Commit messages:
 - Backport 37ca9024ef59d99cae0bd7e25b2e6d3c1e085f97

Changes: https://git.openjdk.org/jdk21u/pull/60/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=60&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310233
  Stats: 815 lines in 7 files changed: 684 ins; 99 del; 32 mod
  Patch: https://git.openjdk.org/jdk21u/pull/60.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/60/head:pull/60

PR: https://git.openjdk.org/jdk21u/pull/60