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

[Kim Barrett]

> On Oct 22, 2019, at 1:35 PM, Thomas Schatzl <thomas.schatzl at oracle.com> 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/
> Testing:
> hs-tier1-5
> 
> Thanks,
>  Thomas

Looks good.