RFR: 8263461: jdk/jfr/event/gc/detailed/TestEvacuationFailedEvent.java uses wrong mechanism to cause evacuation failure

[Kim Barrett]

On Mon, 21 Jun 2021 14:32:16 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   can I have reviews for this change to the jdk/jfr/event/gc/detailed/TestEvacuationFailedEvent.java test to use the only "officially sanctioned" way to cause evacuation failures via the respective debug-level options.
> 
> Testing: checking failing test case to cause evacuation failures
> 
> Thanks,
>   Thomas

Changes requested by kbarrett (Reviewer).

test/jdk/jdk/jfr/event/gc/detailed/TestEvacuationFailedEvent.java line 72:

> 70:         WhiteBox.getWhiteBox().youngGC();
> 71:         // Keep alive data.
> 72:         System.out.println(data);

`Reference.reachabilityFence` seems like a better choice for keep-alive.  Other than that, looks good.

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PR: https://git.openjdk.java.net/jdk/pull/4541