[master] RFR: Rendezvous GC threads under STS for monitor deflation

[Roman Kennke]

On Thu, 28 Oct 2021 21:21:22 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Why does a GC thread need to access a monitor?

It needs to access the Klass*, mainly for size & layout  (heap parsing). And Klass* is stored in the header. When object is locked via monitor, it needs to be able to reach through to the displaced header in the monitor.

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PR: https://git.openjdk.java.net/lilliput/pull/27