RFR: 8265461: G1: Forwarding pointer removal thread sizing [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this change that improves forwarding pointer removal handling by adding thread sizing to the work gang?
> 
> Since work is distributed per region at the moment, it does not make sense to start more threads than regions.
> 
> This can particularly help performance with object/region pinning.
> 
> Testing: tier1-3, using self-verification code
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with two additional commits since the last revision:

 - Added comment
 - iwalulya lkorinth reviews

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3585/files
  - new: https://git.openjdk.java.net/jdk/pull/3585/files/17ba2812..baf8d0d6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3585&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3585&range=00-01

  Stats: 7 lines in 5 files changed: 2 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3585.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3585/head:pull/3585

PR: https://git.openjdk.java.net/jdk/pull/3585