[15] RFR 8245124: Shenandoah: optimize code root evacuation/update during concurrent class unloading

Zhengyu Gu zgu at redhat.com
Mon May 18 18:24:23 UTC 2020



On 5/18/20 2:07 PM, Aleksey Shipilev wrote:
> On 5/18/20 8:03 PM, Zhengyu Gu wrote:
>>>> Updated: http://cr.openjdk.java.net/~zgu/JDK-8245124/webrev.01/index.html
>>>
>>> Good. Any reason why ShenandoahEvacOOMScope is not inside heal_nmethod_metadata()? Is there any
>>> problem to call _bs->disarm(nm) when holding that scope?
>> This is something I want to get rid of, especially on code root
>> unlinking path. Moving ShenandoahEvacOOMScope up is another noticeable
>> improvement, unfortunately, unload_nmethod_caches() triggers barrier.
> 
> Ah. So you want to batch entering/exiting the scope? Okay then.

Yes.

Thanks,

-Zhengyu

> 



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