RFR: 8142952: Unified Logging framework does not allow multiple -Xlog: arguments

[Marcus Larsson]

Hi,

New webrev after offline review with Bengt and Staffan:
http://cr.openjdk.java.net/~mlarsson/8142952/webrev.01/

Incremental:
http://cr.openjdk.java.net/~mlarsson/8142952/webrev.00-01/

Changes:
* LogLevel::Unchanged was changed to LogLevel::NotMentioned.
* Test improvements.

I also looked at FormatBuffers for the string handling in LogOutput, but 
unfortunately they are sized according to template parameters and hence 
don't play well with the dynamic expansion required here.

Thanks
Marcus

On 2015-11-24 11:46, Marcus Larsson wrote:
> Hi,
>
> Please review the following patch to enable multiple -Xlog arguments 
> to aggregate the log configuration.
>
> Summary:
> Tag sets that are unaffected by a -Xlog argument will now be left 
> untouched, enabling them to keep settings from a previous -Xlog argument.
>
> To be able to print the current log configuration, the _config_string 
> on LogOutputs has to be derived from each enabled tag set and its 
> level, instead of the previous copying of the -Xlog argument. This 
> means that -Xlog:all:stdout sets the _config_string for stdout to the 
> explicit list of all tag sets in the VM, with level set to info.
>
> Webrev:
> http://cr.openjdk.java.net/~mlarsson/8142952/webrev.00/
>
> Issue:
> https://bugs.openjdk.java.net/browse/JDK-8142952
>
> Testing:
> Included test through JPRT.
>
> Thanks,
> Marcus