Messages in this thread | | | Date | Sat, 16 Aug 2008 14:50:34 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH RFC 3/3] x86: use mwait for trigger API |
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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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