Messages in this thread | | | Date | Mon, 9 Jul 2007 15:52:05 +0200 | From | Pavel Machek <> | Subject | Re: Hibernation Redesign |
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Hi!
> >>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).
Well, the kexec thingy should be able to hibernate a machine, but it will not be "software-suspend" any more, and it may be quite a lot of work to get it going.
In the end, you'll get rid of freezer problems, but will have two kernels to care about, and certainly more conventional design. I do not think I have time to try that (and don't think freezer problems are _that_ bad in the first place), but some interested soul could certainly try it.
If we deprecate swsusp in 2.6.45 or so, I do not think I'll be crying. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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