Re: [Crash-utility] Kernel dump file access library (repost)
Hello Petr,
Hi all,
during this year's SUSE HackWeek, my colleague started work on enabling
kernel core files in gdb. I realized that there would be at least four
different programs implementing read access to kernel dump files:
1. the crash utility
2. makedumpfile (when re-filtering)
3. kdumpid (my project to get kernel version from a dump file)
4. gdb-kdump (started by my colleague during HackWeek)
At this point, I felt that's too much re-inventing the wheel again and
again, so I took my current code from kdumpid and adapted it as a
library that can be used by everybody:
https://github.com/ptesarik/libkdumpfile
I agree with you, your idea sounds reasonable.
In its current shape, it's usable, but far from complete.
Things that work already:
- identify kdump file format
- parsed meta-information from the header
- open ELF, diskdump, makedumpfile, LKCD
- read data by physical address (incl. Xen Dom0)
- read data by Xen machine address
Things still on my TODO list:
- more formats: sadump, kvmdump, libvirt, xc_core, xc_save
- determine phys_base in ELF files
- determine kernel release if not found in headers
Aren't you going to make writer methods ?
If makedumpfile uses the library, I want to get rid of the dump format
specific codes completely from makedumpfile, otherwise "re-inventing"
will still occur.
I suppose that other tools don't need writer methods, so I think
it would be better if I make them.
Ideally, I would like to replace all current implementations with
this
library, so if a new file format appears, or a new feature is added to
one of the files, it can be immediately used by all kdump-related tools.
Please let me know what you think.
Oh, and if you're developing such a tool, let me know which features
should be added.
I've started an experiment to find out practical problems in switching
to using the library. I'll let you know if I find any problems.
Thanks
Atsushi Kumagai
Regards,
Petr Tesarik
--
Crash-utility mailing list
Crash-utility(a)redhat.com
https://www.redhat.com/mailman/listinfo/crash-utility