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    DateMon, 09 Jul 2007 14:58:50 +1000
    FromNick Piggin <>
    SubjectRe: Hibernation Redesign
    Jeremy Maitin-Shepard wrote:
    > Nick Piggin <nickpiggin@yahoo.com.au> writes:
    
    >>Yes, I have a rough idea about how page reclaim works. But I just
    >>mean it would not be trivial to load the new kernel into physically
    >>discontiguous memory. Possible of course, but I don't think kexec or
    >>the setup code could quite cope ATM.
    > 
    > 
    > It would indeed be a pain for the new kernel to be loaded and have to
    > use discontiguous memory.  The trick is, though, that this is not
    > necessary.  Immediately before jumping to the new kernel, the first X
    > bytes (where X is the amount of memory the new kernel will get,
    > typically 16MB or 64MB) of physical memory are backed up into the
    > arbitrary discontiguous pages that are made available.  This will not
    > take very long, because copying even 64MB of memory is extremely fast.
    > Then the new kernel is free to use the first X bytes of contiguous
    > physical memory.  Problem solved.
    
    Ah, that sounds like it would be the right way to go. Good thinking.
    
    -- 
    SUSE Labs, Novell Inc.
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