RFR: 8259808: Add JFR event to detect GC locker stall [v4]

Wed Jan 27 14:34:40 UTC 2021

On Tue, 26 Jan 2021 09:50:02 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Denghui Dong has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add GCLockerTracer::is_started() that makes the logic more clear
>
> Changes requested by tschatzl (Reviewer).

Since @tschatzl requested changes yesterday I will wait for him to sponsor this.

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PR: https://git.openjdk.java.net/jdk/pull/2088