Re: [Swsusp-devel] Re: Thoughts wanted on merging Software Suspend enhancements

From: Pavel Machek <pavel@suse.cz>
To: Vojtech Pavlik <vojtech@suse.cz>
Cc: Nigel Cunningham <ncunningham@clear.net.nz>,
	Jamie Lokier <jamie@shareable.org>,
	Dmitry Torokhov <dtor_core@ameritech.net>,
	swsusp-devel <swsusp-devel@lists.sourceforge.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [Swsusp-devel] Re: Thoughts wanted on merging Software Suspend enhancements
Date: Tue, 15 Jul 2003 12:08:42 +0200	[thread overview]
Message-ID: <20030715100842.GB3279@zaurus.ucw.cz> (raw)
In-Reply-To: <20030715063612.GB27368@ucw.cz>

Hi!

> > > > > I'd suggest making it a mappable function in the keymap, like reboot is
> > > > > for example. Both for initiating and stopping the suspend. How about
> > > > > that?
> > > > 
> > > > Any user can load his own keymap, I believe... And I do not like
> > > > having special /proc options for esc key...
> > > 
> > > So what? He can press ctrl-alt-del or whatever if he has access to the
> > > keyboard anyway. Nevertheless I don't see any way to cause harm by
> > > cancelling a sw-suspend other than if a server was shutting down due to
> > > the UPS batteries being empty. And in that case the machine will be in a
> > > locked room anyway.
> > 
> > ctrl-alt-del maps to "echo you lost" on many machines. It just signals
> > init, does nothing more.
> > 
> > That UPS is bad enough... It should be okay to have server locked but
> > have its keyboard/monitor publicly available.
> 
> I'm very much sure this feature (having a server locked, while
> keyboard/screen is accessible) is much LESS useful than being able to
> stop an suspend in progress. That's if the suspend isn't lightning fast,
> of course, which is is not.
> 
> Unfortunately, while you can route the start-suspend command through
> userspace (init, whatever) like the reboot command is, but I fear when
> the suspend is in progress, it's not possible to talk to userspace
> anymore ...

No, userspace is frozen at that point.

... and so I believe right thing is to
make magic sysrq combination for aborting suspend...

-- 
				Pavel
Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...