RFR: 8255973: Add more logging to debug JDK-8255917 [v3]

[Yumin Qi]

On Thu, 12 Nov 2020 05:25:26 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Please don't use the metaspace tag for logging inside these generic functions, this makes no sense. Also, I kept the "metaspace" log clean and consistent with JEP387. This should log with only "os" and nothing else.
> 
> Contrary to David I think the original "info" level is fine. We have no guidelines for this unfortunately, but I usually do hard errors - which are too "soft" for warning level, which is printed always - at info. And this output will not be seen often.
> 
> About UL circularity, UL should get fixed - it should not allocate memory while logging.

OK, I will use 'os' at info level then.
I will file a separate issue for UL heap allocation issue.

Thanks.

-------------

PR: https://git.openjdk.java.net/jdk/pull/1150