>From: Rafael J. Wysocki [mailto:rjw at 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
