RFR: 8364503: Test gc/g1/TestCodeCacheUnloadDuringConcCycle.java failed

[Thomas Schatzl]

Hi all,

  please review this change to the `gc/g1/TestCodeCacheUnloadDuringConcCycle.java` test - previously, the GC that we were waiting for in the test could occur between releasing whitebox control and the marker we use to distinguish before/after test setup.

The change makes sure the marker is printed before releasing Whitebox control. So the concurrent start gc we look for can not happen before the marker printing.

Testing: passes 5000 runs of that benchmark

Thanks,
  Thomas

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

Commit messages:
 - 8364503

Changes: https://git.openjdk.org/jdk/pull/26592/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26592&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364503
  Stats: 7 lines in 1 file changed: 6 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26592.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26592/head:pull/26592

PR: https://git.openjdk.org/jdk/pull/26592