RFR: Log rotation

[William Kemper]

On Thu, 1 Sep 2022 16:58:29 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Making the shenandoah log file be able to rotate with given log file count and log file size. Default log file count would be 5 and default log file size would be 20MB.
>
> I am not sure why this facility even exists, as Unified Logging from the JVM is supposed to take care of this?

Thank you for reviewing this @shipilev . The log messages emitted here aren't intended to be read by humans, so we didn't want them interspersed with other messages. That being said, that design decision has led to an uncomfortable amount of code duplication. We could try something like using the `gc+region` tags at the trace level?

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PR: https://git.openjdk.org/shenandoah/pull/158