RFR: JDK-8222259: Shenandoah: Pre-evacuate string-dedup roots in Traversal GC

[Aleksey Shipilev]

On 4/10/19 2:34 PM, Roman Kennke wrote:
>> On 4/10/19 1:28 PM, Roman Kennke wrote:
>>> Fix:
>>> http://cr.openjdk.java.net/~rkennke/JDK-8222259/webrev.00/
>>
>> It looks okay, but I would have expected the call to
>> ShenandoahRootProcessor, rather than naked root
>> walk. Isn't there a path into SRP that does it for traversal?
> 
> Currently not, and the whole idea of pre-evacing anything from
> traversal is a bit of a cludge currently. For example, we need to pre-
> evac everything from code-roots currently, even if we stricly only want
> strong stuff marked. The solution would be to pre-evac strong code
> roots via stacks, and then let nmethod barrier pre-evac everything ever
> entered during the cycle. All of this requires deeper looking into it,
> but probably later when we're seriously into stabilizing traversal GC.

Okay then.

-Aleksey