[15] RFR 8243200: Shenandoah: Allow concurrent nmethod iteration

[Zhengyu Gu]

Hi,

> 
> I just realize that this are chances to double free old table, so this 
> patch needs additional work. I would like to withdraw this RFR for now.

Abstracting the list for holding Shenandoah NMethod data into a class 
and reference counting the list.

Webrev: http://cr.openjdk.java.net/~zgu/JDK-8243200/webrev.01/

Test:
   hotspot_gc_shenandoah

Thanks,

-Zhengyu

> 
> -Zhengyu
> 
> On 4/21/20 3:46 AM, Aleksey Shipilev wrote:
>> On 4/20/20 10:27 PM, Zhengyu Gu wrote:
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8243200
>>> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8243200/webrev.00/
>>
>> Our code style does not allow spaces before postfix operators:
>>   471   _itr_cnt ++;
>> ...
>>   478   _itr_cnt --;
>>
>> Otherwise looks fine. No need for another webrev.
>>