Round 4: Code review request: JDK-8005048, NMT: #loaded classes needs to just show the # defined classes

[Zhengyu Gu]

Previous fix could cause instance class counter go negative, since class 
list in ClassLoaderData contains none instance classes, and walking the 
list is not desirable.

The new solution is to decrement counter in 
InstanceKlass::release_C_heap_structures.

http://cr.openjdk.java.net/~zgu/8005048/webrev.03/

Thanks,

-Zhengyu

On 12/17/2012 3:11 PM, Zhengyu Gu wrote:
> Current NMT implementation reports number of loaded classes at query 
> time, but number of defined classes is what is expected.
>
> This changset reflects two major changes:
>
> 1. It counts number of defined classes vs. number of loaded classes
> 2. It counts number of defined classes for each generation, vs. counts 
> at query time. In this way, the number of defined classes that NMT 
> reports, should match the corresponding class metadata data. As the 
> result, the data should be more accurate.
>
>
> Webrev: http://cr.openjdk.java.net/~zgu/8005048/webrev.00/
>
>
> Thanks,
>
> -Zhengyu