RFR: 8221212: ZGC: Command-line flags should be marked experimental

Stefan Karlsson stefan.karlsson at oracle.com
Thu Mar 21 08:41:31 UTC 2019

Looks good.


On 2019-03-21 08:28, Per Liden wrote:
> ZGC (the -XX:+UseZGC command-line flag) is marked experimental, which 
> means that you always need to use -XX:+UnlockExperimentalVMOptions to 
> unlock that option. However, some of ZGC's flags are incorrectly marked 
> as product flags. This can be a bit confusing, since those flags (but 
> not the -XX:+UseZGC flag) will show up when using -XX:PrintFlagsFinal, 
> even though they are effectively experimental and has no use/meaning 
> unless ZGC is enabled.
> We should not mark any ZGC flags as product flags, until the -XX:+UseZGC 
> flag is made a product flag.
> I have not filed a CSR for this, since these flags are effectively 
> experimental already today, but just aren't properly marked as such.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8221212
> Webrev: http://cr.openjdk.java.net/~pliden/8221212/webrev.0
> /Per

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