RFR: 8330846: Add stacks of mounted virtual threads to the HotSpot thread dump [v18]

[Alan Bateman]

On Wed, 12 Jun 2024 08:45:46 GMT, Inigo Mediavilla Saiz <duke at openjdk.org> wrote:

>> Print the stack traces of mounted virtual threads when calling `jcmd <pid> Thread.print`.
>
> Inigo Mediavilla Saiz has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove unneeded line

It's the countDown by "dummy" thread will unpark "main". The queuing and starting of the second FJ worker thread is happening in the context of dummy's carrier (not dummy itself). We want to eventually remove these temporary transitions, at least for the default scheduler, but aren't there yet. I've attached an initial patch to JDK-8334215 for the issues.

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PR Comment: https://git.openjdk.org/jdk/pull/19482#issuecomment-2167374446