linux-kernel - Re: [RFC] sleepy linux

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Message-ID: <20071230111552.GA8578@elte.hu>
Date:	Sun, 30 Dec 2007 12:15:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pavel Machek <pavel@....cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [RFC] sleepy linux

* Pavel Machek <pavel@....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
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