RFR: 8255973: Add more logging to debug JDK-8255917 [v2]

[Yumin Qi]

On Thu, 12 Nov 2020 02:10:41 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Since we in this bug only concern about metaspace, if we specify -Xlog:os, it will output messaged we are not interested in from other places. I will wait for other inputs for this.
>
> This is 'os' code so the logging should be in the os tag space, though it could be os+metaspace. I also think info is inappropriate and this should be debug or trace level. Alternatively put the logging in a caller that is more obviously only for metaspace.

@dholmes-ora Thanks. I changed the log to os+metaspace at debug level.

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