[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: Domain Save-Restore
Mark Williamson <maw48 <at> cl.cam.ac.uk> writes: > > I would like to understand the method used by Xen to Save/Restore domains. > > As far as I tried... most of the code is written in python and exists in > > lib/python/xen/sv/ directory. I am not much familier with python, but this > > * SV is the (experimental) web interface and is located in > tools/python/xen/sv/. > * Xend is the control daemon and handles all sorts of control-plane things > including receiving commands from SV and the xm command line tool and > dispatching them to the rest of the system. Xend lives in > tools/python/xen/xend/. > * Xfrd is the migration / suspend daemon and is written in C for performance > reasons. It accepts commands dispatched from Xend itself. It lives in > tools/xfrd/ and contains the actual code for suspending / migrating a domain. > > HTH, > Mark Hi Mark, Thanks for that info. I would like to know if it makes any sense to be able to figure out the process table information from the saved image of the VM. I am still not too sure about the save operation, but feel that it is more or less a memory dump. If that is the case, then hypervisor would copy the image back ad somehow restart the VM. Could you enlighten me about how does the hypervisor advises (or triggers) the VM so that its running... how are the registers saved and restored. I know these questions might seem little novice but I am still learning Xen and not sure about the structure of the code. Also, is there any official documentation available for the code structure (apart from the interface manual). How do you put the VM into pause domain? and whats the advantage of putting it in pause? does it freeze all the processes and restricts the CPU cycles alloted to it? If that is the case, is there a way to be able to read this frozen state information using hypervisor. I would really appreciate any help in this regard. Chotu ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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