Hi Bernhard, 2007/05/16 00:08:45 +0200, Bernhard Walle <bwalle at suse.de> wrote: >Hello, > >* Bernhard Walle <bwalle at suse.de> [2007-05-14 23:49]: >> >> I'm working on support for the 4 layer pagetable. > >Here's my first attempt. It works with SLES 10, SP1 on a Tiger4 >machine with 16 GiB of memory. (I had still problems with a big >SGI machine when creating the bitmap. I'm investigating this, too.) > >The problem is not to implement the 4 layer page table, but to >*detect* it. crash uses the built-in configuration data in the kernel >image, and that's what I used in my patch. If you have a better and >still reliable method, I'm open to suggestions. :-) Thank you for the patch. I tested makedumpfile with your patch on linux-2.6.18 ia64, and it output the following message and failed. Error message: $ makedumpfile -cd 31 -x vmlinux vmcore dumpfile Can't read kernel cofiguration from kernel binary makedumpfile Failed. $ The reason was that kernel binary file didn't have "kernel_config_data" because CONFIG_IKCONFIG was not set in my .config. It is uncertain that "kernel_config_data" exists in a kernel binary. I propose that makedumpfile distinguishes the page table (3L or 4L) by checking the defined file name of pud_t. I'm trying for the above implementation. I will send you the patch when it is complete. All the pud_t(s) of linux-2.6.16 - 2.6.21 are defined in the following files: CONFIG_PGTABLE_4 include/asm-ia64/page.h !CONFIG_PGTABLE_4 include/asm-generic/pgtable-nopud.h Thanks Ken'ichi Ohmichi
