Re: [RFC] sleepy linux

[Ingo Molnar <mingo@elte.hu>]

* 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.

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

	Ingo