> Adds `jcmd <pid> Thread.vthread_scheduler` to print the virtual thread 
> scheduler and `jcmd <pid> Thread.vthread_pollers` to print the I/O pollers 
> that support virtual threads doing blocking network I/O operations.
> 
> This is a subset of the diagnostics that we've had in the loom repo for a 
> long time. @larry-cable proposed a PR recently 
> ([pull/22121](https://github.com/openjdk/jdk/pull/22121)) to bring a version 
> of same into main line but it was based on an older proposal. This new PR 
> supplants that effort.
> 
> The jtreg failure handler is updated to execute Thread.vthread_scheduler, 
> useful capture when a test fails or times out.
Alan Bateman has updated the pull request with a new target base due to a merge 
or a rebase. The incremental webrev excludes the unrelated changes brought in 
by the merge/rebase. The pull request contains six additional commits since the 
last revision:

 - Merge branch 'master' into JDK-8337199
 - VThread*Dcmd::execute changes to use helper function
 - Improve regex for matching poller String representation
 - Improve vthread_pollers output
 - Merge branch 'master' into JDK-8337199
 - Initial commit

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22414/files
  - new: https://git.openjdk.org/jdk/pull/22414/files/2e9619a1..ea7df830

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22414&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22414&range=01-02

  Stats: 2120 lines in 75 files changed: 842 ins; 1052 del; 226 mod
  Patch: https://git.openjdk.org/jdk/pull/22414.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22414/head:pull/22414

PR: https://git.openjdk.org/jdk/pull/22414

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