RFR: 8327097: GenShen: Align PLAB sizes down rather than up

Tue Apr 2 14:32:44 UTC 2024

Hi all,

This pull request contains a backport of commit f1d98490 from the openjdk/shenandoah repository.

The commit being backported was authored by Kelvin Nilsen on 27 Mar 2024 and was reviewed by Y. Srinivas Ramakrishna and William Kemper.

Thanks!

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Commit messages:
 - Backport f1d98490f4e2fe94f2ed6db961934812c53395ae

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/33/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=33&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327097
  Stats: 155 lines in 12 files changed: 73 ins; 35 del; 47 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/33.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/33/head:pull/33

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/33