From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Proposal for init/kexec/hotplug format for Xen Date: Sun, 27 Feb 2005 13:10:39 -0600 Message-ID: <42221B2F.9000501@us.ibm.com> References: <1109451460.32219.11.camel@localhost.localdomain> <68d3daa4e95f4ba6740c6c0ffd3f67b8@cl.cam.ac.uk> <4221E676.5000008@us.ibm.com> <4221ED32.2010407@us.ibm.com> <260c30236e5ef2b632b85e5ebaebcb6b@cl.cam.ac.uk> <4221F26B.2030306@us.ibm.com> <1109521867.4385.22.camel@localhost> <4221F87D.2040809@us.ibm.com> <1109527920.9623.57.camel@localhost> <4222107A.1010902@us.ibm.com> <1109530501.9623.75.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: Keir Fraser Cc: Harry Butterworth , Rusty Russell , Jeremy Katz , Xen Mailing List List-Id: xen-devel@lists.xenproject.org Keir Fraser wrote: > The IDC primitives are likely to be *so* low level that this will be a > non-issue. Anything that can needs to be fault-tolerance aware in any > way I think will be in higher layers. > > Really the libidc is almost a no-op -- we have shared memory and > notifications -- semaphores and message queues on top of that is very > little code. I agree. > You sound like you are more worried about the device-channel > setup/teardown/probe/recovery code. That would be above libidc, if we > use libidc at all. I'm currently prototyping a semaphore mechanism. One of the nice things I realized is that if a message queue uses semaphores, then something like xcs is unnecessary. What I'm thinking about right now is how to assign out ports for notification. It's somewhat non-trivial to figure out the best way to manage that. Any thoughts? Regards, Anthony Liguori ------------------------------------------------------- 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