Messages in this thread | | | Date | Sun, 08 Jul 2007 23:22:20 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: Hibernation Redesign |
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Jeremy Maitin-Shepard wrote: > 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. >
You could also use the paravirt_ops pte hooks to create a mapping from linear "physical" addresses to actual machine pages. This is what a Xen kernel needs to do, and all the infrastructure will be in place shortly.
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