Re: [PATCH] idle using PNI monitor/mwait

[Alan Cox]

On Maw, 2003-07-08 at 22:23, Nakajima, Jun wrote:
> Hi Linus,
> 
> Attached is a patch that enables PNI (Prescott New Instructions)
> monitor/mwait in kernel idle (opcodes are now public). Basically MWAIT
> is similar to hlt, but you can avoid IPI to wake up the processor
> waiting. A write (by another processor) to the address range specified
> by MONITOR would wake up the processor waiting on MWAIT.

Is mwait dependant on cached cpu memory and the cache exclusivity logic
or directly on the processor. In other words can I use mwait in future
to wait for DMA to hit a given location ? - Im mostly thinking about
debugging uses