linux-kernel - Re: Back to the future.

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Date:	Fri, 27 Apr 2007 22:51:57 -0400
From:	Daniel Hazelton <dhazelton@...er.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>, Pavel Machek <pavel@....cz>
Subject: Re: Back to the future.

On Friday 27 April 2007 21:44:48 Rafael J. Wysocki wrote:
> On Saturday, 28 April 2007 03:12, Linus Torvalds wrote:
> > On Sat, 28 Apr 2007, Rafael J. Wysocki wrote:
> > > > It's doubly bad, because that idiocy has also infected s2ram. Again,
> > > > another thing that really makes no sense at all - and we do it not
> > > > just for snapshotting, but for s2ram too. Can you tell me *why*?
> > >
> > > Why we freeze tasks at all or why we freeze kernel threads?
> >
> > In many ways, "at all".
> >
> > I _do_ realize the IO request queue issues, and that we cannot actually
> > do s2ram with some devices in the middle of a DMA. So we want to be able
> > to avoid *that*, there's no question about that. And I suspect that
> > stopping user threads and then waiting for a sync is practically one of
> > the easier ways to do so.
> >
<snip>

Apparently I *CANNOT* wrap my head around this - if just because my laptop, 
running a vendor 2.6.17 kernel does s2ram perfectly, at least, it does when 
using the "Upstart" init system rather than the classical SysV init system. I 
have tried it with the classical init and the suspend isn't triggered by the 
buttons that used to do it. I didn't try 'echo ram > /sys/power/state', but I 
have a feeling that would have worked as well. I have problems with s2disk, 
but thats because I keep my swap partition small - I try to keep it at or 
around 256M when I have more than half a gig of Ram in a system. Perhaps one 
of these days I'll grab a multi-gig flash disk, set it up as a swap partition 
and try it again. (every time I've tried s2disk I wind up running out of disk 
space - and this is with nothing but X running. Any kind of progress meter 
for when the system is doing s2disk would be nice - every time I've tried it 
all I see for the nearly 2 minutes before the s2disk attempt ends is a black 
screen. I say 2 minutes because thats how long it takes for it to learn that 
there isn't enough space on the swap-partition to save the image)

DRH
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