RFR: 8252294: Remove OopsInGenClosure usage from younger_refs_iterate

[Stefan Karlsson]

On 2020-08-27 04:36, Kim Barrett wrote:
>> On Aug 25, 2020, at 4:12 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
>>
>> Hi all,
>>
>> Please review this patch to remove the usage of OopsInGenClosure from younger_refs_iterate and related functions.
>>
>> https://cr.openjdk.java.net/~stefank/8252294/webrev.01/
>> https://bugs.openjdk.java.net/browse/JDK-8252294
> 
> Looks good.  Thanks for the detailed overview.
> 
> I don't need a new webrev for the comment deletion below.
> 
> ------------------------------------------------------------------------------
> src/hotspot/share/gc/serial/serialHeap.cpp
>   105   // When collection is parallel, all threads get to cooperate to do
>   106   // old generation scanning.
> 
> This comment no longer makes any sense.

Removed.

> 
> ------------------------------------------------------------------------------
> src/hotspot/share/gc/serial/serialHeap.cpp
>   101   if (_process_strong_tasks->try_claim_task(GCH_PS_younger_gens)) {
> ...
>   112   _process_strong_tasks->all_tasks_completed(scope->n_threads());
> 
> The use of parallel task support no longer makes sense here. I'm
> guessing this is a cleanup you want to save for later?

Yeah. I didn't want to disturb the claiming code. But I'll remove it in 
this patch and rerun the tests.

Thanks for reviewing,
StefanK

> 
> ------------------------------------------------------------------------------
> 
>