Re: [RFC] sleepy linux

Pavel Machek
2008-01-05T21:51:23Z

On Sun 2007-12-30 12:15:52, Ingo Molnar wrote:
>
> * Pavel Machek <pavel@ucw.cz> wrote:
>
> > Todays hardware is mostly capable of doing better: with correctly set
> > up wakeups, machine can sleep and successfully pretend it is not
> > sleeping -- by waking up whenever something interesting happens. Of
> > course, it is easier on machines not connected to the network, and on
> > notebook computers.
> >
> > Requirements:
> >
> > 0) Working suspend-to-RAM, with kernel being able to bring video back.
> >
> > 1) RTC clock that can wake up system
>
> very nice approach! It might require smarter hardware to be really
> efficient, but the generic ability for Linux to utilize S3 automatically
> would _quickly_ drive the creation of smarter hardware i'm sure - so i'd
> propose to include this even if it wastes power in some cases.
>
> a quick feature request: could you please make the wake-on-RTC
> capability generic and add a CONFIG_DEBUG_SUSPEND_ON_RAM=y config option
> (disabled by default) that does a short 1-second suspend-to-RAM sequence
> upon bootup? That way we could test s2ram automatically (which is a MUCH
> needed feature for automated regression testing and automatic
> bisection). In addition, some sort of 'suspend for N seconds' /sys or
> /dev/rtc capability would be nice as well.

Hmm, are you sure it is good idea to do this from kernel? I guess this
is better done from script...

> btw., how far are you from having a working prototype?

SCSI/SATA issues stop me just now, but even if I get that to work, it
will be extremely disgusting hack... and it is unclear how to do it
nicely :-(.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html