8340363: Tag-specific default decorators for UnifiedLogging

[Kirk Pepperdine]

> 
> So to be clear, is the proposal now to just drop the default decorators, 
> rather than allowing them to be replaced with alternate defaults? If 
> that is the case then it is the same as writing:
> 
> -Xlog:A+B::none
> 
> and I don't really see much value in that. But I wouldn't oppose it.
> 

I would. At a minimum you need a timestamp.
> 
> Allowing new defaults gives more flexibility - but obviously the 
> developers using the specific tag combinations have to agree on what 
> defaults to set.
> 

At the moment to get a reasonable GC log for G1, one needs to use the following setting.

-Xlog:gc*,gc+ref=debug,gc+phases=debug,gc+age=debug,safepoint:file=gc.log

Also, the “noise to signal” ratio in these logs is exceptionally high.

Kind regards,
Kirk
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