RFR (S): 8232776: G1 should always take rs_length_diff into account when predicting rs_lengths

[sangheon.kim at oracle.com]

Hi Thomas,

On 10/22/19 10:35 AM, Thomas Schatzl wrote:
> Hi all,
>
>   can I have reviews for this small change that makes G1 always use 
> the error term for rs-length prediction, not only if G1 sees fit.
>
> While rs length prediction is still kind of bad even with this change 
> (and seemingly a band-aid), with that change it is a bit better. While 
> there is a "real" fix for RS length estimation coming that so far 
> looks really good, this change decreases complexity of further changes 
> in G1Policy enough while improving the estimation.
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8232776
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8232776/webrev/
Looks good.

Thanks,
Sangheon


> Testing:
> hs-tier1-5
>
> Thanks,
>   Thomas