Re: Which is simpler? (Was Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support.)

[Nigel Cunningham]

Hi.

On Wednesday 08 February 2006 09:05, Pavel Machek wrote:
> > > > # cat /sys/power/disk_method
> > > > swsusp uswsusp suspend2
> > > > # echo uswsusp > /sys/power/disk_method
> > > > # echo > /sys/power/state
> > > > 
> > > > Is there a big problem with that, which I've missed?
> > > 
> > > Userland suspend is driven by the suspending application which only calls
> > > the kernel to do things it cannot do itself, like freezing (the other)
> > > processes, snapshotting the system etc.  We use the /dev/snapshot
> > > device and the ioctl()s in there, so no sysfs files are needed for that.
> > > It's independent and can coexist with the existing sysfs interface
> > > just fine.
> > 
> > Yes, but how are you going to get it started from (say) klaptop, which only 
> > knows "echo disk > /sys/power/state" as the way of starting a suspend? I'm 
> > suggesting that we create a means whereby the issue of how to start a 
> > cycle could be separated from what implementation is used to do the work. 
> > That is, a simple extension at the start of the disk specific code that 
> > starts swsusp, uswsusp or suspend2 depending upon what you want. Maybe I 
> > should just prepare a patch.
> 
> Please do not patch kernel for that.
> 
> Proper solution is probably creating s2disk program/script, and teach
> kpowersave/klaptop/etc. to just use it. Then s2disk can detect best
> method to use ... and then just do it. You already have suitable
> script, but I'm not sure what its name is.

You have a good point there - the hibernate script is sufficient for the
task. Ok. I'll give up on this idea and consider it their problem for not
using what's provided already.

Regards,

Nigel

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