RFR: 8297186: G1 triggers unnecessary full GCs when heap utilization is low [v4]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this change that better enforces that after gc there is at least one eden region to allocate into?
> 
> That avoids the problem described in the PR.
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  Refactoring after Kim's review, ayang noted that "needs_one_eden_region" has always been "true" which has not been the intention

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11209/files
  - new: https://git.openjdk.org/jdk/pull/11209/files/5467359e..ed7e27ea

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11209&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11209&range=02-03

  Stats: 38 lines in 2 files changed: 20 ins; 5 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/11209.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11209/head:pull/11209

PR: https://git.openjdk.org/jdk/pull/11209