linux-kernel - Re: [PATCH] Kconfig: Update swsusp description

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Message-ID: <20070306094107.GF2040@elf.ucw.cz>
Date:	Tue, 6 Mar 2007 10:41:07 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Kconfig: Update swsusp description

Hi!

> > > Index: linux-2.6.21-rc2/kernel/power/Kconfig
> > > ===================================================================
> > > --- linux-2.6.21-rc2.orig/kernel/power/Kconfig	2007-02-28 23:54:45.000000000 +0100
> > > +++ linux-2.6.21-rc2/kernel/power/Kconfig	2007-03-04 11:50:48.000000000 +0100
> > > @@ -81,30 +81,35 @@ config SOFTWARE_SUSPEND
> > >  	bool "Software Suspend"
> > >  	depends on PM && SWAP && ((X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP))
> > >  	---help---
> > > +	  Enable the suspend to disk (STD) functionality.
> > >  
> > > +	  You can suspend your machine with 'echo disk > /sys/power/state'.
> > > +	  Alternatively, you can use the additional userland tools available
> > > +	  from <http://suspend.sf.net>.
> > > +
> > > +	  In principle it does not require ACPI or APM, although for example
> > > +	  ACPI will be used if available.
> > > +
> > > +	  It creates an image which is saved in your active swap. Upon the next
> > >  	  boot, pass the 'resume=/dev/swappartition' argument to the kernel to
> > 
> > Actually, these days resume=... on kernel command line needs to be
> > there for suspend, too, IIRC.
> 
> I didn't change this line, so?

So I should go and fix it ;-). (I'm now overloaded with email sorry
for being terse.)

Can we do something like

+	  Enable the suspend to disk (STD) functionality.
+	  In principle it does not require any support from BIOS, although 
+	  ACPI will be used if available.

+	  You can suspend your machine with 'echo disk >
+	  /sys/power/state' after placing resume=/dev/swappartition on
+	  kernel command line.
+	  Alternatively, you can use the additional userland tools available
+	  from <http://suspend.sf.net>.

(and remove ...upon next boot... section).

> > > +	  Right now you may boot without resuming and resume later but in the
> > > +	  meantime you cannot use the swap partition(s)/file(s) involved in
> > > +	  suspending.  Also in this case you must not use the
> > 
> > I'd prefer not to encourage this use. It has too many traps ready for
> > people.
> 
> But IMHO there should be a warning that if you boot without resuming, make sure
> you'll not resume after the next reboot or bad things will happen.

+	It is possible to boot without resuming and resume later but
+	if you access any partitions/files used by suspended kernel,
+	you'll probably loose your data. See ... for details.

?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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