RFR: 8170388: Deprecate the flag -XX:ExplicitGCInvokesConcurrentAndUnloadsClasses

[Thomas Schatzl]

Hi,

On Mon, 2016-11-28 at 22:16 +0100, Erik Helin wrote:
> Hi all,
> 
> when working on "8170067: 
> -XX:ExplicitGCInvokesConcurrentAndUnloadsClasses is not implemented
> for G1" I realized that it is just a pain to support this flag now
> that -XX:CMSClassUnloadingEnabled is true by default (since JDK 8).
> The flag -XX:ExplicitGCInvokesConcurrentAndUnloadsClasses is (since
> JDK 8) completely redundant, specifying
> -XX:+ExplicitGCInvokesConcurrent will result in the exact same
> behavior by default (since CMSClassUnloadingMaxInterval is 0 by
> default and CMSClassUnloading is true by default).
> 
> Rather than supporting this flag for G1 and CMS, spending time on
> trying to validate all the strange command-line arguments
> combinations that can appear, I vote for deprecating this flag.
> 

Looks good to me.

> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8170388
> 
> Patch:
> http://cr.openjdk.java.net/~ehelin/8170388/00/
> 
> Testing:
> - JRPT
> - Added new jtreg test
> 
> A CCC request has been submitted, reviewed and approved.

Thanks,
  Thomas