RFR (S) 8049304: race between VM_Exit and _sync_FutileWakeups->inc()

[Tom Benson]

Hi again,
Just noticed I skipped this question in your reply:

>
> So in ReenterI() the OM_PERFDATA_OP(FutileWakeups, inc()) call 
> immediately
> follows an OrderAccess::fence() call. Doesn't that make that increment as
> "safe" as it can be without having a real lock?
>
>
Yes - odd that I noticed the fence after the update in that code, and 
not the one right before it!
Thanks,
Tom