RFR: 8270801: Print VM arguments with java -Xlog:arguments

[Thomas Stuefe]

On Fri, 16 Jul 2021 20:16:06 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> > Side note, I wish we had a similar option to print the pid (and not much else). In our proprietary port, we have a -XshowPid, which I use surprisingly often, even in scripts.
> 
> We have a few choices:
> 
> * `-Xlog:pid` : but this seems too limited to introduce a new log tag
> * `-Xlog:identifyprocess`: print all relevant info that helps identifying the process. This would include both the arguments, the pid, and perhaps some other info as well (owner id, etc??).
> 
> If the second makes sense, we should think of a good tag name :-) I will hold the integration of the current PR for now.

After thinking about this, I think either a new "-Xlog:process", or we could just log it under "-Xlog:os". The latter could maybe benefit from some cleaning up to reduce the noise at info level.

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PR: https://git.openjdk.java.net/jdk/pull/4801