Messages in this thread | | | Subject | RE: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation | Date | Tue, 24 Jul 2007 22:00:04 +0800 | From | "Huang, Ying" <> |
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>From: Rafael J. Wysocki [mailto:rjw@sisk.pl] >This is not the point. There are memory regions that you should not _restore_, >because that will cause harm. > >> On x86_64, there is another usage of nosave during processing E820 >> memory map. But I don't know why the memory region other than E820_RAM >> are marked as nosave. I think only the memory region of type E820_RAM >> will be thought of normal memory, others will be thought as reserved. Is >> it sufficient just to check whether the page is reserved? > >No, it's not.
The "/proc/iomem" records information of all memory regions including "normal RAM" and all kinds of reserved regions, which is backed by iomem_resource. On x86_64, it is initialized in the exact same way as nosave region initialization.
I think maybe we can replace the "nosave region" concepts with "iomem_resource" (maybe need some enhancement).
Best Regards, Huang Ying - 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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