Re: [PATCH 1/5] Add a global synchronization point for pvclock

[Zachary Amsden]

On 04/23/2010 11:35 AM, Jeremy Fitzhardinge wrote:
> On 04/23/2010 02:31 PM, Zachary Amsden wrote:
>    
> > Does lfence / mfence actually serialize?  I thought there was some
> > great confusion about that not being the case on all AMD processors,
> > and possibly not at all on Intel.
> >
> > A trap, however is a great way to serialize.
> >
> > I think, there is no serializing instruction which can be used from
> > userspace which does not trap, at least, I don't know one off the top
> > of my head.
> >      
> rsm is not technically privileged... but not quite usable from usermode ;)
>    

rsm under hardware virtualization makes my head hurt
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/