RFR (S): Specialize update-refs for disabled matrix case

[Roman Kennke]

Am 21.04.2017 um 19:23 schrieb Aleksey Shipilev:
> Hi,
>
> This improves performance when partial/matrix is not enabled, for obvious reasons.
>
> Patch:
>   http://cr.openjdk.java.net/~shade/shenandoah/update-refs-no-matrix/webrev.01/
>
> Before:
>   Concurrent Update Refs      =     4.04 s (a =   269496 us) (n =    15)
>      (lvls, us =   169922,   271484,   277344,   279297,   300987)
>
> After:
>   Concurrent Update Refs      =     3.56 s (a =   237003 us) (n =    15)
>      (lvls, us =   162109,   234375,   238281,   240234,   295872)
>
> Testing: hotspot_gc_shenandoah, benchmarks
>
> Thanks,
> -Aleksey
>
>
Great! Yes!


Roman