PING: RFR: 8207756: jstat should show CGC STW phases of ZGC

[Per Lidén]

Hi,

Please have a look at the zServiceability class, which is where code like this is intended to live.

/Per

> On 26 Jul 2018, at 14:30, Yasumasa Suenaga <yasuenag at gmail.com> wrote:
> 
> PING: Could you review it?
> 
>>   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8207756/webrev.00/
> 
> 
> Yasumasa
> 
> 
>> On 2018/07/18 11:59, Yasumasa Suenaga wrote:
>> Hi all,
>> Please review this change:
>>   JBS: https://bugs.openjdk.java.net/browse/JDK-8207756
>>   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8207756/webrev.00/
>> jstat shows CGC STW phases as CGC and CGCT fields since JDK-8153333 .
>> However, ZGC does not adapt to it yet as following:
>> ```
>> $ jstat -gc 1234 1 1
>>  S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT CGC CGCT GCT
>>   - - - - - - 514048.0 12288.0 4352.0 3731.2 0.0 0.0 - - - - - - 0.000
>> ```
>> I uploaded webrev which is for jdk/jdk repo. Please tell me if it
>> should be for zgc repo.
>> I'm not an author of ZGC. So I need a sponsor.
>> (I'm a Reviewer of jdk. If this change should be pushed to jdk/jdk,
>> please tell me. I will push it after reviewing.)
>> Thanks,
>> Yasumasa