Re: [RFC] sleepy linux

Oliver Neukum
2007-12-26T20:23:37Z

Am Mittwoch, 26. Dezember 2007 21:17:22 schrieb Pavel Machek:
> On Wed 2007-12-26 18:28:04, Oliver Neukum wrote:
> > Am Mittwoch, 26. Dezember 2007 00:07:31 schrieb Pavel Machek:
> > > Heute 00:07:31
> > >
> > > This is RFC. It does not even work for me... it sleeps but it will not
> > > wake up, because SATA wakeup code is missing. Code attached for illustration.
> > >
> > > I wonder if this is the right approach? What is right interface to the
> > > drivers?
> >
> > IMHO you are making to many special cases. The system can be "sleepy"
> > if all devices can be runtime suspended and all CPUs are idle.
>
> Is there an easy way to tell if all the devices are runtime suspended?

Do you really want to know whether they are suspended or whether they
could be suspended?

> I guess I need to know from atomic context :-(.

Urgh. suspend() must be able to sleep and can fail.

Regards
Oliver
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