RFR: 8335902: Parallel: Refactor VM_ParallelGCFailedAllocation and VM_ParallelGCSystemGC

Mon Jul 8 16:24:08 UTC 2024

Similar cleanup as https://github.com/openjdk/jdk/pull/19056 but in Parallel. As a result, the corresponding code in `SerialHeap` and `ParallelScavengeHeap` share much similarity.

The easiest way to review is to start from these two VM operations, `VM_ParallelCollectForAllocation` and `VM_ParallelGCCollect` and follow the new code directly, where one can see how allocation-failure triggers various GCs with different collection efforts.

Test: tier1-6; perf-neural for dacapo, specjvm2008, specjbb2015 and cachestresser.

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Commit messages:
 - pgc-vm-operation

Changes: https://git.openjdk.org/jdk/pull/20077/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20077&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335902
  Stats: 352 lines in 14 files changed: 96 ins; 169 del; 87 mod
  Patch: https://git.openjdk.org/jdk/pull/20077.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20077/head:pull/20077

PR: https://git.openjdk.org/jdk/pull/20077