RFR: 8296768: Use different explicit claim marks for CLDs in Parallel and Serial GC

Thu Nov 10 20:01:24 UTC 2022

Hi all,

  please review this change that implements the same optimization as [JDK-8295871](https://bugs.openjdk.org/browse/JDK-8295871) to use different claim marks for different full gc phases for Parallel and Serial GC. For both collectors I decided to clear all marks before full gc, but that is arbitrary. If you want this could be done at the end to the same effect.

Testing: tier1-5 (with JDK-8295871)

Thanks,
  Thomas

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Commit messages:
 - Serial/Parallel implementation

Changes: https://git.openjdk.org/jdk/pull/11092/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11092&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296768
  Stats: 23 lines in 4 files changed: 8 ins; 4 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/11092.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11092/head:pull/11092

PR: https://git.openjdk.org/jdk/pull/11092