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SubjectRe: [linux-pm] [PATCH 0/8] Suspend block api (version 6)
On Thu, 13 May 2010, Tony Lindgren wrote:

> > > And that's why
> > > it should be handled by runtime power management instead.
> >
> > Runtime PM is not capable of freezing userspace and shutting down CPUs.
> > More or less by definition -- if it could then it wouldn't be "runtime"
> > any more, since the processor wouldn't be running.
>
> Not true. We are already powering off CPUs and rebooting them for
> at least omaps in every idle loop using cpuidle. The memory stays on.

Okay, that's a valid point. But is that approach usable in general
(i.e., on non-OMAP systems)?

How do you handle situations where the CPU is currently idle but an
event (such as I/O completion) is expected to occur in the near future?
You don't want to power-off and reboot then, do you?

Alan Stern



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