[makedumpfile] extract vmcoreinfo from /proc/vmcore for Xen
Itsuro ODA
oda at valinux.co.jp
Thu Sep 27 20:49:01 EDT 2007
Hi,
--- background ----------------------------------------------------
* what the makedumpfile is:
To shorten the size of the dumpfile and the time of creating the
dumpfile, makedumpfile copies only the necessary pages for analysis
to the dumpfile from /proc/vmcore. You can specify the kind of
unnecessary pages with dump_level. If you want to shorten the size
further, enable the compression of the page data.
* Xen extraction
makedumpfile also has a feature that extracting the part of
xen hypervisor and domain-0 from /proc/vmcore taken under xen
environment. In most cases under xen environment, it is enough to
analyze a cause of system crash.
* extract vmcoreinfo from /proc/vmcore
makedumpfile 1.2.0 supports to extract the vmcoreinfo data from
/proc/vmcore and uses it for dump filtering. (for a vmcore taken
under the native environment.)
------------------------------------------------------------------
I'd like to support the "extract vmcoreinfo from /proc/vmcore"
function for the Xen extraction too.
I think a way of supporting this as follows:
* The hypervisor makes its vmcoreinfo at the initialize.
* add a new hypervisor call to get the hypervisor's vmcoreinfo.
The hypercall would be a subcommand of the kexec hypercall.
* dom-0 exposes the hypervisor's vmcoreinfo via
/sys/hypervisor/vmcoreinfo
* kexec-tool looks /sys/hypervisor/vmcoreinfo and makes an elf-note
according it
Any comments or suggestions are welcome before I will start to
implement it.
Thanks.
--
Itsuro ODA <oda at valinux.co.jp>
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