Current trivial test for `TestGetTotalGcCpuTime` fails as some OSs may have a slower update rate for the underlying CPU time thread counters than the code anticipated, causing the test to fail which assumes that some work have been performed and the count should be non-zero.
Solution: All GCs we are testing are tracing GCs. Therefore, add some marking job to inflate the GC CPU time such that we can guarantee to observe a non-zero value. ------------- Commit messages: - Add some work for GC Changes: https://git.openjdk.org/jdk/pull/28362/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28362&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8372008 Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/28362.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/28362/head:pull/28362 PR: https://git.openjdk.org/jdk/pull/28362
