[Crash-utility] PATCH 00/10] teach crash to work with "live" ramdump

Hi Dave, Recently I used crash-tool for the first time and I was pleasantly surprised, it really looks like a very useful and handy debugging tool ;) And I was surprised again when I figured out that it can be used to debug the live system on the same machine. Cool! Now I am wondering if we can teach it to debug the live guests runnning under qemu/kvm. This looks certainly possible, qemu supports gdb remote protocol. But. this obviously needs more work. And. Afaics crash-tool needs some fixes anyway. See 01/10-07/10, but probably it needs more changes, so far I only tried to audit task.c and kernel.c. I tried to document every change, but I am very new to this code so I can be easily wrong. So can't we teach it to work with live/raw RAM dumpfiles for the start? See 09/10 and 10/10. With these changes I can run qemu-kvm with the -object memory-backend-file,id=MEM,size=128m,mem-path=/tmp/MEM,share=on -numa node,memdev=MEM options and then do $ crash path-to-guests-vmlinux live:/tmp/MEM@0 to debug the live guest, No need to dump-guest-memory + restart /usr/bin/crash which can be slow. What do you think? Oleg. defs.h | 1 + filesys.c | 8 ++++---- kernel.c | 7 +++---- main.c | 11 +++++++++++ ramdump.c | 49 ++++++++++++++++++++++++++++++++++--------------- task.c | 13 ++++++------- tools.c | 2 +- 7 files changed, 60 insertions(+), 31 deletions(-)