RFR: 8305903: Deflate monitors of dead objects before they become unreachable

[Roman Kennke]

On Tue, 2 May 2023 10:00:33 GMT, David Holmes <dholmes at openjdk.org> wrote:

> So how/when is the monitor actually deleted in such a case?

ObjectSynchronizer::deflate_monitor_list() calls OM::deflate_monitor(). When the OM's object is unreachable, the update of the header is skipped, and the monitor owner set to DEFLATER_MARKER (otherwise the object header will *also* be updated to the original mark). When the concurrent deflation gets to actually deflating phase (after a handshake) it will pick up the OM from the OM list and see that it's marked for deflation and deallocate it.

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PR Comment: https://git.openjdk.org/jdk/pull/13721#issuecomment-1531216962