RFR: Don't initially evacuate Synchronizer roots

[Roman Kennke]

Am Mittwoch, den 23.11.2016, 10:24 -0500 schrieb Zhengyu Gu:
> You may want to add assertion to ensure that it is always the case,
> and prevent the breakage in the future.

I think we've already got asserts in synchronizer.

We simply don't expect Synchronizer roots to be always in to-space
anymore. All uses of ObjectMonitor's object do the barrier before using
it.

Roman

> 
> Thanks,
> 
> -Zhengyu
> 
> 
> 
> On 11/23/2016 10:09 AM, Roman Kennke wrote:
> > 
> > I checked all the uses of ObjectMonitor from the Synchronizer
> > monitor
> > list. In all the places that they are used we do have proper
> > barriers.
> > There is no place that expects the oop in the monitor to always be
> > to-
> > space. Therefore we don't need to evacuate those ObjectMonitor
> > roots at
> > the init-evac pause.
> > 
> > Tested with jtreg and SPECjvm2008
> > 
> > http://cr.openjdk.java.net/~rkennke/noevacsyncroots/webrev.00/
> > 
> > Ok?
> > 
> > Roman
>