RFR: Skip RESOLVE in SATBBufferClosure if no forwarded objects are in heap

[Roman Kennke]

Am 20.06.2018 um 13:28 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/satb-no-rb/webrev.01/
> 
> I see SATBBufferClosure::do_buffer hot in one of the workloads. One of the things that can be helped
> there is avoiding RB-inducing RESOLVE when we know there are no forwarded objects in heap. Instead
> of reintroducing the whole bunch of template parameters, it is easier to check once before
> processing the entire SATB buffer.
> 
> Testing: tier3_gc_shenandoah
> 

Ok, that makes sense.

I wonder if it makes even more sense to simply transfer the oops to the
worker's taskqueue? I think we do this in traversal.

Roman