RFR: 8252105: parallel heap inspection for ZCollectedHeap [v2]

[Per Liden]

On Mon, 5 Oct 2020 14:29:02 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> Hi @linzang,
>> 
>> I started reviewing your patch in more detail. However, I ended up with a large number of major comments and I started
>> to feel that it would probably be more productive to create an alternative patch for this, so I did.
>> https://github.com/openjdk/jdk/compare/master...pliden:8252105_parallel_object_iterator
>> 
>> Some of the main differences compared to your proposed patch:
>> * Root scanning is also now done in parallel
>> * Same code paths regardless of number of worker threads used
>> * Arrays are chunked for better work stealing/balance
>> * A terminator is used for better work stealing/balance
>> * All of the functionality is isolated (as much as possible) to ZHeapIterator
>> 
>> I think the easiest way forward is probably if you close this PR, and I'll open a new one.
>
> Hi @pliden,
> Sorry for late reply.
> I will close this PR and let's discuss in your new one.
> 
> -Lin

@linzang Ok, thanks. I created https://github.com/openjdk/jdk/pull/507.

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PR: https://git.openjdk.java.net/jdk/pull/103