Re: Hibernating To Swap Considered Harmful

Rafael J. Wysocki
2007-07-13T09:23:39Z

On Friday, 13 July 2007 07:42, Joseph Fannin wrote:
> On Thu, Jul 12, 2007 at 08:06:43PM -0700, david@lang.hm wrote:
> > On Thu, 12 Jul 2007, Rafael J. Wysocki wrote:
>
> > > Plus we need to figure out how to avoid corrupting filesystems and
> > > swap in use by the "old" kernel and its processes (hint: a separate
> > > "hibernation partition" is a no-go).
> >
> > I thought the existing hibernation wrote to the swap partition as it's
> > dedicated space?
> >
> > I didn't know that anyone was suggesting writing the hibernation image to
> > a filesystem that the kernel was activly accessing.
>
> I'm suggesting a dedicated, preallocated hibernation *file*, right
> now. There's no way around it, if hibernation is to be reliable --
> otherwise hibernation can fail if the system has used enough of its
> swap space, so that there isn't enough room to write the hibernate
> image.
>
> Even if it's desirable to allow hibernation to fail if the system is
> too deep into swap, it's a moot point.

If you're afraid of that, use a dedicated swap file.

Greetings,
Rafael

--
"Premature optimization is the root of all evil." - Donald Knuth