RFR: 8291037: Move PLAB resizing mechanism to G1EvacStats

Tue Jul 26 15:56:30 UTC 2022

Hi all,

  please review this refactoring that moves the PLAB resizing mechanism to `G1EvacStats` as G1 is the only user for this functionality.

The change is split into two commits for easier review: 65eef6482cc0a995d29e822c9c26063bb42c7679 only moves the code,  028e3adeca1d496520f0c79f3b4bcedd7e7f0f15 tries to improve it a bit. 

Note that this change also removes the old, unused PLAB re-sizing algorithm previously used by CMS, hence the relatively large count of deleted LOC.

Testing: gha, gc/g1

Thanks,
  Thomas

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Commit messages:
 - touch-up
 - Code motion

Changes: https://git.openjdk.org/jdk/pull/9644/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9644&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291037
  Stats: 190 lines in 6 files changed: 67 ins; 100 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/9644.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9644/head:pull/9644

PR: https://git.openjdk.org/jdk/pull/9644