RFR: 8142979: Add programmatic enable/disable methods to Unified Logging

[Marcus Larsson]

On 2015-11-30 19:40, Coleen Phillimore wrote:
>
> I'm confused how this API works.
>
> http://cr.openjdk.java.net/~mockner/classunload/src/share/vm/prims/jvmtiEnv.cpp.sdiff.html 
>
>
> I imagine we'd want to do:
>
> if (value != 0) {
>   LogConfiguration::configure_stdout(info, true, classunload);
> } else {
>   LogConfiguration::configure_stdout(off, true, classunload);
> }
>
> ???

Yes, except you would need to pass the classunload tag with the LOG_TAGS 
macro, so it'd be:

if (value != 0) {
   LogConfiguration::configure_stdout(LogLevel::Info, true, 
LOG_TAGS(classunload));
} else {
   LogConfiguration::configure_stdout(LogLevel::Off, true, 
LOG_TAGS(classunload));
}

and that would be the same as passing -Xlog:classunload=info and 
-Xlog:classunload=off

Regards,
Marcus

> Thanks,
> Coleen
>
>
> On 11/25/15 7:13 AM, Marcus Larsson wrote:
>> Hi,
>>
>> Please review the following patch adding support for configuration of 
>> the stdout unified logging output from within the VM itself.
>>
>> The patch adds the configure_stdout() function, allowing a set of 
>> tags to be set to the given level on stdout.
>> To disable logging the level is simply specified as LogLevel::Off.
>>
>> The patch depends on the fix for 8142952 [0] that's currently out on 
>> review, so the configuration is correctly aggregated rather than reset.
>>
>> Webrev:
>> http://cr.openjdk.java.net/~mlarsson/8142979/webrev.00/
>>
>> Issue:
>> https://bugs.openjdk.java.net/browse/JDK-8142979
>>
>> Thanks,
>> Marcus
>>
>> [0]: https://bugs.openjdk.java.net/browse/JDK-8142952
>