From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kip Macy Subject: Re: "virtual cluster" debug support Date: Sat, 19 Mar 2005 00:00:56 -0800 Message-ID: References: Reply-To: Kip Macy Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit In-Reply-To: Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Ian Pratt Cc: Xen Developers , ian.pratt@cl.cam.ac.uk List-Id: xen-devel@lists.xenproject.org Please review the following diff. I will follow up with a signed off patch with the required fixes. http://www.fsmware.com/xenofreebsd/gdb/050318/clusterbkpt.diff -Kip On Fri, 18 Mar 2005 00:35:10 -0000, Ian Pratt 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 > ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click