RFR: 8273112: -Xloggc:<filename> should override -verbose:gc [v4]

[David Holmes]

On Fri, 3 Sep 2021 02:48:59 GMT, Xiaowei Lu <github.com+39413832+weixlu at openjdk.org> wrote:

>> According to java 16 specifications for java command (https://docs.oracle.com/en/java/javase/16/docs/specs/man/java.html), the command line option -Xloggc should override -verbose:gc if both options are given with the same java command. However, gc information still outputs to console even if gc log file is specified.
>> 
>> $java -Xloggc:gc.log -verbose:gc -version
>> [0.000s][warning][gc] -Xloggc is deprecated. Will use -Xlog:gc:gc.log instead.
>> [0.003s][info ][gc] Using G1
>> $cat gc.log
>> [0.003s][info][gc] Using G1
>> 
>> As a result, we propose to put off the log configuration of -verbose:gc option until we are confident that there isn’t -Xloggc option.
>
> Xiaowei Lu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix initialization of _legacyGCLogging

Marked as reviewed by dholmes (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5295