On 9/20/2012 12:40 PM, Igor Zhbanov wrote:
> But is it correct to consider ARM core to be offline when it is just in WFI state?

nope

for all intents and purposes, the cpu is still there.

in an idle state, the cpu logically is there, and ready to resume execution if needed...
that's the definition of idle ;-)

offline is where the administrator takes a cpu out of circulation.

neither specifies any physical hardware state... in fact offline is usually implemented as an idle state, at
least on x86. the semantics for how to get back are different (system autonomous versus administrator)

now, quite possible some ARM platforms abuse this and don't implement something as "idle" but as "offline" instead.
that sounds not very smart to me.