RFR: 8319251: [REDO] Change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT

Tue Mar 19 13:32:20 UTC 2024

On Tue, 19 Mar 2024 03:08:24 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> A fix to change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT.
>
> Default switch looks good.
> 
> I'm surprised that the changes in VMProps.java were not already in place as they are needed regardless of what the default lock mode is. ???

@dholmes-ora - Thanks for the review!

Yes, this was quite the surprise when I did my first round of Mach5 Tier[1-8] testing.
All of the original Mach5 testing for recursive lightweight locking skipped the macosx-x64
platform because of our shortage of those machines (understandable!) so this issue was
not caught then. The gory details about those closed task definitions are in the bug report.

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PR Comment: https://git.openjdk.org/jdk/pull/17932#issuecomment-2007181936