RFR - [RFE] JDK-8007141 : Introduce Dynamic MBean exposing the perf counters

[Harsha Wardhana B]

Hi Erik,

I am not sure if Perf Counters could be disabled. If yes, then 
PerfCounter MBean must throw appropriate exception while getting MBeanInfo.

I don't know about tests for PerfCounter. The webrev contains tests for 
PerfCounter MBean.

I am not sure how we will be breaking other's code. Could you please 
elaborate?

Thanks
Harsha

On Monday 27 February 2017 07:39 PM, Erik Gahlin wrote:
> Hi Harsha,
>
> How will perf counters be supported?
>
> Can they be removed at anytime, or only at major releases etc. Do we 
> have tests for them? I think it would be good know, and perhaps state 
> somewhere so we don't break people's code.
>
> Erik
>
>> Hi All,
>>
>> Please review the below RFE,
>>
>> JDK-8007141 <http://JDK-8007141> : Introduce Dynamic MBean exposing 
>> the perf counters.
>>
>> with webrev at,
>>
>> http://cr.openjdk.java.net/~hb/8007141/webrev.00/
>>
>> Appreciate if I can get inputs for below.
>>
>> 1. Location of HotSpotPerfCounterMBean. It is located at 
>> src/jdk.management/share/classes/com/sun/management/internal. It can 
>> be moved to src/jdk.management/share/classes/com/sun/management if 
>> required.
>>
>> 2. Javadoc comments for HotSpotPerfCounterMBean. Not sure if it is 
>> adequate.
>>
>> 3. Description for each attribute of MBean. I am using getUnits(), 
>> getVariability(), and getFlags() for description. I am not sure if 
>> that is the right description. Appreciate inputs from someone who 
>> knows perf counters well.
>>
>> Thanks
>>
>> Harsha
>>
>>
>

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