* Vivek Goyal <vgoyal at in.ibm.com> [2007-07-11 08:07]: > On Tue, Jul 10, 2007 at 07:52:01PM +0300, Dan Aloni wrote: > > On Tue, Jul 10, 2007 at 08:09:04AM -0400, Neil Horman wrote: > > > On Tue, Jul 10, 2007 at 12:18:17PM +0530, Vivek Goyal wrote: > > > > On Fri, Jul 06, 2007 at 05:58:04PM +0300, Dan Aloni wrote: > > > > > On Fri, Jul 06, 2007 at 03:28:14PM +0200, Bernhard Walle wrote: > > > > > > Hello, > > [...] > > > > > It contains enough information in order to make a compact kernel > > > > > dump (makedumpinfo needs to go over the struct page arrays). As > > > > > you see, it also contains the kernel version. > > > > > > > > > > > > > But this will not solve Bernhard's problem where looking at a vmcore > > > > he wants to know which vmlinux (kernel version with time stamp) has > > > > generated this vmcore. So adding a ELF NOTE should help. > > > > > > > I think an ELF note would be a fine idea. > > > > Okay, so here's an implemenation. > > > > See the attached proof-of-concept patches to the kernel-side kexec and > > kexec-tools (might need some cleanup though). Next to follow, a patch > > to makedumpfile. With these patches a new "LINUX" elf note generated > > by the kernel in the format that makedumpfile expects and is being > > passed on by the kexec util to the kdump kernel. > > > > As a bonus, with this patch you don't even have to compile the kernel > > with debug information in order for the filtering to work. > > > > This implementation looks interesting. No need of debug compiled > vmlinux for dump filtering purposes. No run time vmlinux binary modifications > as suggested by your previous mails. People can export kernel CONFIG info > like PAGESIZE etc with the help of this ELF note and any tool which is > processing kernel core file can benifit from this. No guesses required for > determining the page size of crashed kernel. I also like way of implementing it. :) Thanks, Bernhard
