RFR: 8280289: Enhance debug pp() command with NMT info [v3]

[Zhengyu Gu]

On Mon, 24 Jan 2022 06:18:32 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Then malloc case is even worse, the block could be deallocated by another thread. Even `oop->print()` is questionable ...
>
> Can the printing be done inside do_allocation_site() instead? That way we are holding the ThreadCritical that will prevent concurrent NMT record/remove operations.

Yes, we can. But I think dealing with malloc'd memory is more problematic, if call triggers concurrent execution.

I am going to withdraw this for now and take another look how debuggers behave.

Thanks

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PR: https://git.openjdk.java.net/jdk/pull/7160