RFR: 8280705: Parallel: Full gc mark stack draining should prefer to make work available to other threads

[Thomas Schatzl]

Hi all,

  can I get reviews for this change that improves task queue handling during queue overflow similar to JDK-8280396 for Parallel GC? Basically the change modifies the queue selection heuristics to be the same as for G1.

Testing: tier1-5, internal promotion perf testing, perf testing of some local benchmarks (BRT, optaplanner) looking for regressions

Thanks,
  Thomas

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Commit messages:
 - Parallel gc task queue

Changes: https://git.openjdk.java.net/jdk/pull/7244/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7244&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280705
  Stats: 26 lines in 3 files changed: 16 ins; 5 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7244.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7244/head:pull/7244

PR: https://git.openjdk.java.net/jdk/pull/7244