Re: xm pause <domain>

[Kip Macy <kmacy@fsmware.com>]

> Cool!

Enthusiasm is always welcome  :-).

>
> Some information here:
> http://lkcd.sourceforge.net/doc/linuxworld2000/LKCD.html
>
> There may be some more hanging around somewhere - I suspect that's the paper I
> remembered reading...
>
> Of course, for non-Linux guests these tools won't necessarily be much (any?)
> use, so ELF format core files might prove more generally useful (I don't know
> if the LKCD lcrash tool can support ELF dump files - it'd be real nice if it
> did).

Having worked _briefly_ with elf coredumps as a starting point for
process checkpointing, I don't think they would be well suited for this.
An elf coredump defines all of a running applications mappings in the
program header. In a VM, there will be MANY mappings, which may be
fragmented, corresponding to many page directory pointers. If all I
cared about were the kernel state, that would be fine, but I think users
would like to be able to see what processes were doing at the time.
Examining the user-state will of course be very OS-specific.
Nonetheless, I think that it is important that the information be there,
so that if someone does choose to develop the tool, the pieces will
already be there.

Any corrections or contrary opinions are welcome ...



				-Kip



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