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

[Coleen Phillimore]

On Wed, 23 Nov 2022 00:59:27 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.
>
> src/hotspot/share/runtime/synchronizer.cpp line 1572:
> 
>> 1570:     } else {
>> 1571:       // A non-JavaThread can just free the ObjectMonitors:
>> 1572:       deleted_count = delete_monitors(delete_list);
> 
> Which non-JavaThread can execute this code?

Wasn't it the safepoint cleanup actions where the VMThread could call this?

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