Withdrawn: 8277757: Parallelize humongous reclaim

[duke]

On Tue, 30 Nov 2021 12:06:36 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

> Please review this change to use parallel threads for humongous reclaim.
> 
> **Summary**
> The task doing humongous reclaim is part of "Post Evacuate Cleanup 2", but currently it is executed like a serial task. In many cases this is not a problem, but if the humongous reclaim is the only part in cleanup 2 that has substantial work, it would benefit from using multiple threads. There is no technical problem with this and this change simply enables multiple threads to do the work in parallel. 
> 
> **Testing**
> - [x] Mach5 tier 1-3
> - [x] Local testing verifying JFR tests are unaffected
> - [x] Performance testing checking for regressions

This pull request has been closed without being integrated.

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PR: https://git.openjdk.java.net/jdk/pull/6612