RFR 8231264: Implementation of JEP 374: Disable biased-locking and deprecate all flags related to biased-locking

[David Holmes]

Hi Patricio,

This looks good to me. Ready to go once the JEP is targeted.

Thanks,
David

On 27/03/2020 5:23 am, Patricio Chilano wrote:
> Hi all,
> 
> Please review the following implementation for JEP 374: Disable and 
> Deprecate Biased Locking.
> 
> As already discussed we will change the default value for 
> UseBiasedLocking to false. Deprecating the flags will also give more 
> visibility to the change and should increase our changes to potentially 
> get more feedback.  After a transition/evaluation period and based on 
> collected evidence that will complement the results of our own 
> benchmarks we can decide if we want to keep this feature or not.
> 
> I modified test VMDeprecatedOptions.java to include the deprecated 
> flags, except for the two diagnostic ones (PrintBiasedLockingStatistics, 
> PrintPreciseBiasedLockingStatistics).
> 
> Tested in mach5, tiers1-7 on all platforms (Linux-x64, macOS-x64, 
> Windows-x64, Solaris-sparcv9).
> 
> Let me know if there are more tests I should run.
> 
> Bug:
>    https://bugs.openjdk.java.net/browse/JDK-8231264
> 
> Webrev:
>    http://cr.openjdk.java.net/~pchilanomate/8231264/v1/webrev/
> 
> 
> Thanks,
> 
> Patricio