Re: xm pause <domain>

[Rolf Neugebauer <rolf.neugebauer@intel.com>]

On Wed, 2005-01-26 at 16:23, Mark A. Williamson wrote:
> > I've written the code for a generic xen guest coredump, I'll write a
> > separate tool to post-process the header into something either LKCD or
> > FreeBSD's gdb will recognize.
> 
> Cool.
> 
> > Now the question is, can you give me some guidance on adding it into
> > xend - it doesn't look as straightforward as I had hoped.
> 
> You'll need a function in tools/libxc/ that'll do the dump (I guess this is 
> what you have already).
> 
> Then you'll need to add a Python wrapper for this function in 
> tools/python/xen/lowlevel/xc/xc.c.  This shouldn't be too hard, using the 
> other functions in there as a template...

why do you want to add this to xend? I might be missing something here,
but can't you just provide a stand-alone util to do this. 

having bindings both for C (in libxc) and in python would still be
useful.

Rolf

> Finally you'll need to provide a means to dump using the xm tool.  This 
> touches quite a few files, I'm afraid, although none of them require complex 
> changes...
> 
> It looks like you'll need to edit:
> * tools/python/xen/xm/main.py to add a subprogram for doing a dump.
> * tools/python/xen/xend/XendClient.py to add a method for requesting a dump 
> from the server
> * tools/python/xen/xend/server/SrvDomain.py to add an operation for dumping a 
> domain (this will get activated when the client makes a request)
> * tools/python/xen/xend/XendDomain.py to add a domain_dump() method to be 
> called by SrvDomain.py (this will pause the domain, call your Xc dump 
> function and unpause it)
> 
> You may find it helpful to compare the call paths triggered by a destroy or a 
> save, which will be similar to what you want.
> 
> For icing on the cake, you could also rig up some kind of dumping in the 
> reap() function in XendDomain.py to autodump crashed domains before 
> restarting / destroying them.
> 
> HTH,
> Mark
> 
> 
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