Messages in this thread | | | Subject | Re: swsusp status report | From | Andi Kleen <> | Date | 26 Jul 2006 17:13:02 +0200 |
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"Rafael J. Wysocki" <rjw@sisk.pl> writes: > > The code that restores the memory state from the suspend image in step > (11) also uses the kernel identity mapping to address memory, so it cannot > access highmem pages on i386, but it practically has no other limitations as > far as the image size is concerned. In other words, it would be possible to > restore suspend images as big as 80% or even 90% of RAM, or the normal zone > on i386, if the 'snapshotting' code were able to create them.
Why can't you just kmap or ioremap them as needed and pass the pfns/struct page * for IO?
> The code that performs steps (5) and (11) of the suspend-resume cycle is > quite robust and there is only one known problem with it, which seems to > be x86_64-specific. Namely, on x86_64 machines with more than 2 GB of RAM > there are memory gaps and/or reserved memory areas between the 2nd and 3rd > Gbyte of physical memory and swsusp tries to save these areas as though > they were RAM which leads to oopses. This issue is now being worked on.
I guess we could just borrow a new struct page flags bit again and set it during memory setup. That would fix your problem I guess. Should be fairly easy to do. Let me know if you need it.
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