RFR: JDK-8199620: Support for JNI object pinning

[Roman Kennke]

Am 14.03.2018 um 19:13 schrieb Roman Kennke:
> Currently, the Get/Release*Critical() family of functions use the
> GCLocker protocol to ensure that no JNI critical arrays are in use when
> a GC pause is entered.
> 
> Some GCs may instead want to use object pinning and guarantee that the
> object does not move. For example, this is easy to do with region-based
> GCs (G1, Shenandoah, ZGC) by simply not including regions with pinned
> objects in the collection set.
> 
> The implementation/API that I'm proposing is fairly simple: add two
> methods oop pin_object(oop) and void unpin_object(oop) to CollectedHeap,
> and call them from JNI's Get/Release*Critical methods.
> 
> This approach has been working perfectly fine since a long time in
> Shenandoah.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8199620
> Webrev:
> http://cr.openjdk.java.net/~rkennke/8199620/webrev.00/
> 
> 

Ping? Any takers for this?

Roman

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