On 04/23/2010 02:31 PM, Zachary Amsden wrote:
Does lfence / mfence actually serialize? I thought there was somersm is not technically privileged... but not quite usable from usermode ;)
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.