Hello Vivek, On Fri, 24 May 2013 10:36:44 -0400 Vivek Goyal <vgoyal at redhat.com> wrote: [snip] > Sorry, I don't understand the problem. If we swapped low memory and > crash reserved memory, that should have been taken care by prepared > ELF headers so that we map the right pfns. In x86 we swap 640K of low > memory with 640K of memory in reserved and we take care of this by > preparing elf headers accordingly. > > So why s390 can't do the same thing? I am not sure if I understand this. Currently we create the ELF header in a way that we have virtual=real. In the copy_oldmem_page() we do the swap so that for the /proc/vmcore code it looks like contiguous non-swapped memory. One reason why I thought this was necessary was that /dev/oldmem also uses the function and it should provide linear memory access like it is on the live system with /dev/mem. Is that implementation incorrect? Best Regards, Michael
