Re: [PATCH documentation 1/2] nohz1: Add documentation.

[Arjan van de Ven]

> ------------------------------------------------------------------------
>
> 1.	It increases the number of instructions executed on the path
> 	to and from the idle loop.
>
> 2.	On many architectures, dyntick-idle mode also increases the
> 	number of times that clocks must be reprogrammed, and this
> 	reprogramming can be quite expensive.


it's really that we're no longer using periodic clocks, but only one-shot clocks only.
(which then leads to having to program them every time)

but arguably, that's because of HRTIMERS more than NOHZ
(e.g. I bet we still turn off periodic even for nohz as long as hrtimers are enabled)

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