[jdk26] RFR: 8373714: Shenandoah: Register heuristic penalties following a degenerated GC

Wed Jan 14 00:20:58 UTC 2026

Hi all,

This pull request contains a backport of commit [385c4f81](https://github.com/openjdk/jdk/commit/385c4f8180d30c0e41b848eb4b2c1c8788211422) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Kelvin Nilsen on 8 Jan 2026 and was reviewed by William Kemper.

Thanks!

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Commit messages:
 - Backport 385c4f8180d30c0e41b848eb4b2c1c8788211422

Changes: https://git.openjdk.org/jdk/pull/29213/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29213&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373714
  Stats: 12 lines in 7 files changed: 4 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/29213.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29213/head:pull/29213

PR: https://git.openjdk.org/jdk/pull/29213