Re: [PATCH RFC 3/3] x86: use mwait for trigger API

[Jeremy Fitzhardinge]

Arjan van de Ven wrote:
> monitor/mwait is rather really expensive.. are we really sure we want
> to use this?
> (from an Intel cpu perspective the answer is very likely no; but I don't
> know what AMD does here)
>   

The intended use is when you're going to be waiting for a while (on the
order of microseconds or more).  In the Xen case, I use this to block
the vcpu if we pass a few iterations without the condition being true. 
While the mwait patch doesn't do this at present, it could.

    J

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