RFR: 8256302: releasing oopStorage when deflating allows for faster deleting

[Daniel D. Daugherty]

On Wed, 23 Nov 2022 00:59:52 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Releasing ObjectMonitor oopStorage earlier when deflating allows ObjectMonitor
>> deletion by a JavaThread (usually the MonitorDeflationThread) to happen while a
>> ThreadBlockInVM helper is in place. This should improve time-to-safepoint.
>
> Seems okay in principal, but some queries on the details.
> 
> Thanks.

@dholmes-ora, @robehn, @kimbarrett and @coleenp -
I think I've replied to all the review comments. I haven't updated the code yet
for the things that I said that I would fix, but I'll try to get to that soon.

> src/hotspot/share/runtime/synchronizer.cpp line 1560:
> 
>> 1558:       }
>> 1559:       // Make the calling JavaThread blocked (safepoint safe) while we
>> 1560:       // free the ObjectMonitors:
> 
> Suggestion s/Make/Mark/

I will fix this.

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PR: https://git.openjdk.org/jdk/pull/11296