8382335: gc/stress/jfr/TestStressAllocationGCEventsWithShenandoah.java intermittently fails with OOME

[rgithubli]

JDK-8382335.

The root cause likely to be the too fast allocation, especially with the Big test, which only allocates humongous objects. It does need to create some heap pressure to have AllocationRequiringGC events, but the test creates a bit too much for shenandoah.

Tuned down the allocation in this change. test/hotspot/jtreg/gc/stress/jfr passed locally. Running 100 repetition locally now.

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Issue

• JDK-8382335: gc/stress/jfr/TestStressAllocationGCEventsWithShenandoah.java intermittently fails with OOME (Bug - P4)

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[sendaoYan]

Should we update the copyright year.

[sendaoYan]

I can not find the use of LockSupport. Seems do not need for now.

[sendaoYan]

After apply the proposed patch, there are other failure report, shows below:

java.lang.RuntimeException: No events: expected false, was true
at jdk.test.lib.Asserts.fail(Asserts.java:715)
at jdk.test.lib.Asserts.assertFalse(Asserts.java:520)
at jdk.test.lib.jfr.Events.hasEvents(Events.java:160)
at jdk.jfr.event.gc.detailed.StressAllocationGCEvents.run(StressAllocationGCEvents.java:92)
at jdk.jfr.event.gc.detailed.TestStressAllocationGCEventsWithShenandoah.main(TestStressAllocationGCEventsWithShenandoah.java:47)

[rgithubli]

Thanks for testing out this patch @sendaoYan . Problemlisted these two tests before coming up a better solution: #30802