RFR: 8200429: Adjust object pinning interface on CollectedHeap

[Per Liden]

On 04/03/2018 10:27 AM, Roman Kennke wrote:
> Am 03.04.2018 um 08:42 schrieb Per Liden:
>> The recent additions to CollectedHeap to support object pinning didn't
>> quite fit the bill for what the Shenandoah folks had in mind. Instead of
>> having CollectedHeap::pin_obejct/unpin_object grab/release the GCLocker
>> when object pinning is not supported, we add a
>> CollectedHeap::supports_obejct_pinning() and let the caller take the
>> appropriate action based on the response.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8200429
>> Webrev: http://cr.openjdk.java.net/~pliden/8200429/webrev.0
>>
>> /Per
> 
> Looks good to me. Thank you!

Thanks for reviewing Roman!

Do you or Zhengyu plan on upstreaming a version of the patch you linked 
to in the other mail thread, to support object pinning with 
JavaCritical_? It seems that patch would complete the overall object 
pinning story for HotSpot and would be useful for other GCs as well (at 
least G1 and ZGC).

/Per

> 
> Roman
>