RFR: Add NMT support for Java heap

[Stefan Karlsson]

Looks good to me.

Two issues that we discussed off-line, that we might want to deal with 
in the future:

1) nmt_commit and friends can be inlined, which would result in the 
wrong frame being extracted by CALLER_PC.
2) We don't report the memory for our mark stacks.

Thanks,
StefanK

On 2017-12-12 11:42, Per Liden wrote:
> As Aleksey noticed, we don't register the Java heap with the native 
> memory tracker. Here's a patch to do that.
>
> http://cr.openjdk.java.net/~pliden/zgc/nmt_java_heap/webrev.0/
>
> cheers,
> Per