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

[Patricio Chilano]

Hi David,

On 3/26/20 7:50 PM, David Holmes wrote:
> Hi Patricio,
>
> This looks good to me. Ready to go once the JEP is targeted.
Thanks for looking into this! Yes, I'll wait for that.

Patricio
> 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