Re: Hibernation Redesign

[Nick Piggin]

Nick Piggin wrote:
> Jeremy Maitin-Shepard wrote:
>
> > Al Boldi <a1426z@xxxxxxxxx> writes:
> >
> >
> > > Pavel Machek wrote:
> > >
> > > > We are stuck with refrigerator for now, and at least for hibernation,
> > > > I don't see any feasible alternative.
> >
> >
> >
> > > Feasible alternative?
> >
> >
> >
> > I posted such an alternative to the list a short time ago: hibenrating
> > from a *new* kernel space/user space that is created by loading a new
> > kernel in a manner similar to what is done for kexec crashdumps.  Unlike
> > kexec crashdumps, however, it would not require reserving any memory at
> > boot, because the necessary memory (maybe 16MB or 64MB) can be freed
> > just before hibernating, and device drivers can be properly stopped so
> > that DMAs don't stomp over certain memory.
>
>
> This is the Morton method, isn't it? :) I remember it sounding like a
> very good idea when he brought it up, but I can't remember the details
> of why it was rejected or what the problems were.

Hmm, and it seems like I won't get to know without reliving what
looks like an epic flamewar starting.... here:

  http://thread.gmane.org/gmane.linux.kernel/374889

However from a quick look it seems like the only reason is the RAM
overhead of a reserve area. It seems unfortunate that it was
dismissed so quickly because of that problem (which could be
improved).

--
SUSE Labs, Novell Inc.
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