RFR: 8264311: Heap object statistics

[Chris Plummer]

On Tue, 30 Mar 2021 15:04:57 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> For Lilliput evaluation, it would be useful to be able to get some statistics about heap objects, e.g. how many objects there typically are, what is their (average) size, how big is the live data set, how many objecs have an identity hash code and how many objects are locked. Some of that information may be useful for general purpose too, e.g. the avg live data set and object size/count information might be quite useful to have.
> Testing:
>  - [x] Some manual tests, verifying the plausability of the output by hand
>  - [ ] tier1
>  - [ ] tier2

You'll need a CSR for this enhancement.

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PR: https://git.openjdk.java.net/jdk/pull/3271