[Crash-utility] [PATCH] kmem, snap: iomem/ioport display and vmcore snapshot support

Some days ago I was in a situation that I had to convert vmcore in kvmdump format into ELF since some extension module we have locally can be used only on relatively old crash utility, around version 4, but such old crash utility cannot handle kvmdump format. To do the conversion in handy, I used snap command with some modifications so that it tries to use iomem information in vmcore instead of host's /proc/iomem. This patch is its cleaned-up version. In this development, I naturally got down to also making an interface for an access to resource objects, and so together with the snap command's patch, I also extended kmem command for iomem/ioport support. Actually: kmem -r displays /proc/iomem crash> kmem -r 00000000-0000ffff : reserved 00010000-0009dbff : System RAM 0009dc00-0009ffff : reserved 000c0000-000c7fff : Video ROM ... and kmem -R displays /proc/ioport crash> kmem -R 0000-001f : dma1 0020-0021 : pic1 0040-0043 : timer0 0050-0053 : timer1 ... Looking into old version of kernel source code back, resource structure has been unchanged since linux-2.4.0. I borrowed the way of walking on resouce tree in this patch from the lastest v3.3-rc series, but I guess the logic is also applicable to old kernels. I expect Dave's regression testsuite. Also, there would be another command more sutable for iomem/ioport. If necessay, I'll repost the patch. --- HATAYAMA Daisuke (4): Add vmcore snapshot support Add kmem -r and -R options Add dump iomem/ioport functions; a helper for resource objects Add a helper function for iterating resource objects defs.h | 9 ++++ extensions/snap.c | 54 ++++++++++++++++++++++- help.c | 2 + memory.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++-- 4 files changed, 180 insertions(+), 7 deletions(-) -- Thanks. HATAYAMA Daisuke