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

[Staffan Larsen]

Looks good!

Thanks,
/Staffan

> On 26 nov. 2015, at 16:17, Marcus Larsson <marcus.larsson at oracle.com> wrote:
> 
> 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
>