PerfData counter: sun.gc.policy.generations in JDK 8

Staffan Larsen staffan.larsen at oracle.com
Mon May 18 08:22:38 UTC 2015


Looks like a good patch to me.

/Staffan

> On 14 maj 2015, at 18:12, Srinivas Ramakrishna <ysr1729 at gmail.com> wrote:
> 
> https://bugs.openjdk.java.net/browse/JDK-8080345 <https://bugs.openjdk.java.net/browse/JDK-8080345>
> 
> 
> 
> On Wed, May 13, 2015 at 1:08 PM, Srinivas Ramakrishna <ysr1729 at gmail.com <mailto:ysr1729 at gmail.com>> wrote:
> 
> With perm gen going away (and being replaced by metaspace) in JDK 8, it makes sense that the counter
> sun.gc.policy.generations should be "2", rather than "3". However, in JDK 8 that counter still says 3.
> As I understand, the intention was that this counter would allow you to (for example) know the range of
> the sun.gc.generation.$num.* counters describing each of $num < sun.gc.policy.generations in the heap.
> Recall that the erstwhile perm gen in JDK 7 used to be synonymous with sun.gc.generation.2, but the
> JDK 8 avatars are now sun.gc.metaspace and sun.gc.compressedclassspace.
> 
> The fix is simple, and I can submit a patch. Is there an existing bug for this?
> 
> thanks!
> -- ramki
> 

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