linux-kernel - Re: [linux-pm] Re: Hibernation considerations

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Date:	Fri, 20 Jul 2007 12:15:36 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	david@...g.hm
cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Milton Miller <miltonm@....com>,
	linux-pm <linux-pm@...ts.linuxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	Jeremy Maitin-Shepard <jbms@....edu>
Subject: Re: [linux-pm] Re: Hibernation considerations

On Fri, 20 Jul 2007 david@...g.hm wrote:

> or the userspace helper functions that setup the instructions for the 
> hibernate warn you if you are telling it to mount a filesystem that it 
> knows is ext3 and is in use by the system going to sleep.

One can argue that the ext3 implementation is inadequate.  We should be
able to give it a mount option requiring it to fail rather than play
back the journal and write to the disk.


> > What I've been trying to say from the very beginning is that the current
> > frameworks _support_ hibernation a la ACPI S4 (although that's not exactly
> > ACPI S4) and if we are going to introduce a new framework, then it should
> > be designed to _support_ ACPI S4 fully _from_ _the_ _start_.
> 
> here is where there is some disagreement (although it may just be 
> misunderstanding on the 'fully support' phrase)
> 
> it sounds like you are saying that the ACPI support requires a lot of work 
> (the phrase I've seen some people use is a requirement to 'fix all the 
> drivers'). we aren't wanting to have this work prevent the non-ACPI 
> hibernation from progressing.

You have completely misunderstood.  That phrase "fix all the drivers" 
has nothing whatsoever to do with ACPI.  It is a prerequisite for 
removing the freezer.

And unless I'm mistaken, removing the freezer was the main reason for 
doing all this kexec-style work in the first place.

Alan Stern

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