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Re: [Xen-devel] "virtual cluster" debug support

To: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] "virtual cluster" debug support
From: Kip Macy <kip.macy@xxxxxxxxx>
Date: Sat, 19 Mar 2005 00:00:56 -0800
Cc: Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxxxx>, ian.pratt@xxxxxxxxxxxx
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Please review the following diff. I will follow up with a signed off
patch with the required fixes.



On Fri, 18 Mar 2005 00:35:10 -0000, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> wrote:
> > To my local tree I'm about to commit support for the notion of a
> > "virtual cluster" for debugging purposes. The idea is that when one
> > node (domain) in a cluster hits a breakpoint, all the other nodes are
> > paused so that the first node doesn't get voted out of the quorum. I'd
> > be very surprised if there are other potential users for this
> > functionality, but I'm asking just in case.
> >
> > The current implementation is done in such a way as to minimally
> > perturb the existing interfaces to make it easy to carry it as an
> > outside patch indefinitely. However, if others might use, it could be
> > implemented more cleanly.
> I guess the 'nice' way of doing this would be to have a notion of
> 'domain groups', akin to process groups. This would be pretty trivial to
> hack in:
>  * add a group_id integer to the domain struct. 0 is special = not
> grouped
>  * add a domains struct * to create a circular list of domains in same
> group
>  * add a dom0_op to set the group of a domain (scan domain list, adjust
> circular list)
>  * on break point follow circular list issuing pause_domain(d)
> Ian

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