There are requests from hotspot developers to improve test reproducing by enabled test repeat execution directly in the jtreg.

It is possibly right now to repeat whole jtreg execution in the makefile, while it is very slow.

The jtreg repeat benefits:
1) caches compilation and thus should execute re-testing faster
2) no overhead from jtreg starting/reading test suite/VMProps/finishing
3) concurrent execution by jtreg itself

It might-be not a current goal to support all test execution, might be make "exeprimental" mode right now for evaluation.