RFR: 8255243: Reinforce escape barrier interactions with ZGC conc stack processing [v2]

[Richard Reingruber]

On Tue, 27 Oct 2020 13:28:53 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> It does sound good indeed to me if you don't mind doing that. Thanks!
>> I have run the tests dedicated to EscapeBarriers with ZGC enabled and also the DeoptimizeObjectsALot stress testing. I will run some more serviceability tests and my teams CI testing until tomorrow.
>
> Thanks @reinrich. I uploaded your patch to this PR, and will add you as contributor. Also addressed your review comments. Hope your testing went fine.

Thanks for importing the patch and for addressing my comments.
I've tested hotspot_serviceability, jdk_svc, jdk_jdi, vmTestbase_nsk_jdi, vmTestbase_nsk_jvmti, vmTestbase_nsk_jdwp. Just the test jdk/jdk/jfr/event/runtime/TestClassLoaderStatsEvent.java fails repeatedly with ZGC. It does so independently of this pr.

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PR: https://git.openjdk.java.net/jdk/pull/832