Question regarding JEP 8204089 Timely Reducing Unused Committed Memory

[Zhengyu Gu]

Hi,

> 
> 5)I have not heard of J9 Gencon/Shenandoah providing similar 
> functionality. Can you point me to further documentation on which 
> feature you model upon?

Shenandoah does provide similar functionality under experimental flags:

-XX:+ShenandoahUncommit
-XX:ShenandoahUncommitDelay

It does not need full gc before uncommitting (actually it calls 
madvise(MADV_DONTNEED) on Linux)

Also, it has "compact" heuristics that targets low memory footprint by 
aggressively uncommitting heap.

Thanks,

-Zhengyu

> 
> Thanks.
> 
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