RE: [Xen-ia64-devel][PATCH] turn on dcr.dm inside XEN

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Alex Williamson write on 2007年2月8日 4:00:
> Hi Anthony,
> 
>    I think I found a bug in this patch.  After saving and restoring a
> PV domain a few times, I seem to be getting here with
> v->arch.privregs == NULL.  I'll see if I can figure out why that is,
> but would appreciate if you could take a look as well.  Thanks,

Hi Alex,

I think this is because arch_get_info_guest may be called before privregs
are allocated.

I propose we remove dcr from struct vcpu_extra_regs.
I don't think dcr should be configurable.

If you agree, I would like to do this patch.

BTW, turning on dcr.dm can gain 5% performance improvement on 
SPECINT2000, of cause SPECINT2000 is compiled by ICC.


- Anthony


> 
>       Alex

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